| WO/2010/114242 | COAL HEATER AND HOT AIR BLASTER |
| WO/2009/008971 | COMBUSTION INITIATOR |
| WO/2009/008971 | COMBUSTION INITIATOR |
Claims
[1] A firewood boiler 10 comprising: a body 10a including a front water tank 12 to which heating water is supplied and a rear water tank 13 from which heating water is discharged, the rear water tank
13 being spaced apart from the front water tank 12; and heat exchange pipes 14 including upper and lower heat exchange pipes 14a and
14b, which are provided at upper and lower portions between the front water tank 12 and the rear water tank 13, wherein a combustion space 15, where the combustion of wood is performed, is defined between the upper and lower heat exchange pipes 14a and 14b, and the upper and lower heat exchange pipes 14a and 14b are arranged in a lateral direction with respect to the combustion space 15.
[2] The firewood boiler 10 according to claim 1, further comprising: a midnight regenerative boiler 30, wherein the midnight regenerative boiler 30 is connected to a first connecting part 31a that is formed at one horizontal end of a T-shaped connecting pipe 31, a second connecting part 31b is formed at the other horizontal end of the T- shaped connecting pipe 31, and is connected to the rear water tank 13 through a heating-water supply line 33 connected to a first electronic valve 32, a third connecting part 31c is formed at a vertical lower end of the T-shaped connecting pipe 31, and is connected to an indoor heating- water supply line 35 through an indoor heating- water supply pump 34 and a second electronic valve 34a, an indoor heating- water recover unit of the midnight regenerative boiler 30 is connected to the inside 100 of a house through an indoor heating- water recovery line 36, the heating- water recover unit of the midnight regenerative boiler 30 is connected to the front water tank 12 of the firewood boiler 10 through a heating- water recovery line 37 on which a heating- water recover pump 38 is provided, a temperature sensor 33a is provided on the heating- water supply line 33 at a position close to the rear water tank 13 of the firewood boiler 10, and if the temperature of heating water of the heating- water supply line 33, which is measured by the temperature sensor 33a, is equal to or higher than a predetermined first set temperature, the first electronic valve 32 is opened.
[3] The firewood boiler 10 according to claim 2, further comprising: a hot- water tank 40, wherein a lower portion of the hot-water tank 40 is connected to a cold-water supply line 44 on which a cold-water supply pump 43 is provided, the cold-water supply line 44 is connected to one end of a hot- water heat exchange unit 45 submerged in heating water in the upper water tank 11, which is formed an upper portion of the firewood boiler 10 so as to communicate with front and rear water tanks 12 and 13, the other end of the heat exchange unit 45 is connected to an indoor hot- water supply line 41, which is provided at an upper portion of the hot- water tank 40, through a hot- water supply line 46, and if the temperature of heating water measured by the temperature sensor 33a is equal to or higher than a predetermined second set temperature that is set to be lower than the first set temperature, the cold-water supply pump 43 is operated.
[4] A firewood boiler 200 comprising: a body 200a including a front water tank 12 to which heating water is supplied and a rear water tank 13 from which heating water is discharged, the rear water tank 13 being spaced apart from the front water tank 12; and upper heat exchange pipes 14a that are formed at an upper portion between the front water tank 12 and the rear water tank 13, wherein a combustion space 203, where the combustion of wood is performed, is defined between the upper heat exchange pipes 14a and a bottom of the body
200a, a flue 201 is formed at the bottom of the body 200a, an air supply device 210 for supplying outside air is connected to one end of the flue 201, and air supply ports 202 opened toward the rear of the combustion space 203 are formed at the other end of the flue so that the supplied outside air is supplied from the front of the combustion space 203 toward the rear thereof, and the upper heat exchange pipes 14a are arranged in a lateral direction with respect to a combustion direction in the combustion space 203.
[5] The firewood boiler 200 according to claim 4, further comprising: a midnight regenerative boiler 30, wherein the midnight regenerative boiler 30 is connected to a first connecting part 31a that is formed at one horizontal end of a T-shaped connecting pipe 31, a second connecting part 31b is formed at the other horizontal end of the T- shaped connecting pipe 31, and is connected to the rear water tank 13 through a heating-water supply line 33 connected to a first electronic valve 32, a third connecting part 31c is formed at a vertical lower end of the T-shaped connecting pipe 31, and is connected to an indoor heating- water supply line 35 through an indoor heating- water supply pump 34 and a second electronic valve 34a, an indoor heating-water recover unit of the midnight regenerative boiler 30 is connected to the inside 100 of a house through an indoor heating-water recovery line 36, the heating- water recover unit of the midnight regenerative boiler 30 is connected to the front water tank 12 of the firewood boiler 200 through a heating- water recovery line 37 on which a heating- water recover pump 38 is provided, a temperature sensor 33a is provided on the heating- water supply line 33 at a position close to the rear water tank 13 of the firewood boiler 200, and if the temperature of heating water of the heating- water supply line 33, which is measured by the temperature sensor 33a, is equal to or higher than a predetermined first set temperature, the first electronic valve 32 is opened.
[6] The firewood boiler 200 according to claim 5, further comprising: a hot- water tank 40, wherein a lower portion of the hot-water tank 40 is connected to a cold-water supply line 44 on which a cold-water supply pump 43 is provided, the cold-water supply line 44 is connected to one end of a hot- water heat exchange unit 220 that is provided around the combustion space 203 of the firewood boiler 200, the other end of the heat exchange unit 220 is connected to an indoor hot- water supply line 41, which is provided at an upper portion of the hot- water tank 40, through a hot- water supply line 46, and if the temperature of hot water measured by a hot- water temperature sensor 221, which is provided at the other end of the hot- water heat exchange unit 220, is equal to or higher than a predetermined set temperature, the cold-water supply pump 43 is operated.
[7] The firewood boiler 200 according to any one of claims 4 to 6, wherein the air supply ports 202 are inclined toward an upper side of the combustion space 203.
[8] The firewood boiler 200 according to any one of claims 4 to 6, wherein the air supply ports 202 are formed at the left and right front portions of the body 200a.
[9] The firewood boiler 200 according to any one of claims 4 to 6, wherein a guide plate 204 is provided below the upper heat exchange pipes 14a, and the guide plate 204 includes an opening 204a formed at the center thereof, and a guide piece 204b that is formed at the periphery of the opening 204a so as to be inclined downward.
[10] The firewood boiler 10(200) according to any one of claims 1 and 4, further comprising: a regenerative heating- water tank 130, wherein the regenerative heating- water tank 130 is connected to a first connecting part 31a that is formed at one horizontal end of a T-shaped connecting pipe 31, a second connecting part 31b is formed at the other horizontal end of the T- shaped connecting pipe 31, and is connected to the rear water tank 13 through a heating-water supply line 33 connected to a first electronic valve 32, a third connecting part 31c is formed at a vertical lower end of the T-shaped connecting pipe 31, and is connected to an indoor heating- water supply line 35 through an indoor heating- water supply pump 34 and a second electronic valve 34a, an indoor heating- water recover unit of the regenerative heating- water tank 130 is connected to the inside 100 of a house through an indoor heating- water recovery line 36, the heating- water recover unit of the regenerative heating- water tank 130 is connected to the front water tank 12 of the firewood boiler 10(200) through a heating- water recovery line 37 on which a heating- water recover pump 38 is provided, a temperature sensor 33a is provided on the heating- water supply line 33 at a position close to the rear water tank 13 of the firewood boiler 10(200), and if the temperature of heating water of the heating- water supply line 33, which is measured by the temperature sensor 33a, is equal to or higher than a predetermined first set temperature, the first electronic valve 32 provided on the T- shaped connecting pipe 31 is opened.
[11] The firewood boiler 10(200) according to claim 10, wherein a hot- water heat exchange unit 145 is provided at an upper portion of the regenerative heating- water tank 130 so as to be submerged in heating water, and one end of the hot- water heat exchange unit 145 is connected to a cold-water supply line 141, and the other end of the hot- water heat exchange unit is connected to a hot- water supply line 142.
[12] The firewood boiler 10(200) according to any one of claims 1 and 4, wherein a discharge pipe 1 Ib, which is used to discharge combustion gas generated in the combustion space 15(203), is formed at the body 10a(200a), and the discharge pipe 1 Ib is connected to the exhaust pipe 50 that is connected to a blast pipe 52 communicating with a blower 51. |
Description FIREWOOD BOILER
Technical Field
[1] The present invention relates to a firewood boiler that is substituted for an electrical boiler or an oil boiler or used together with the boilers and can heat hot water or heating water by using heating power generated from the combustion of wood. In particular, the present invention relates to an improved firewood boiler that has improved combustion efficiency and can control heating power thereof. Background Art
[2] In recent years, crude oil has risen in price. Accordingly, research for saving energy resources, such as oil or electricity, have been performed in various fields. Further, since much energy is used in a field of a boiler that is used to provide heating water or hot water to a general house or a plastic greenhouse in an agricultural district, there is a demand for research for saving energy resources.
[3] A general boiler heats hot water or heating water by using flame that is generated from the combustion of oil, or ohmic heat that is generated by electricity. However, when hot water or heating water is heated by only oil combustion or electricity consumption, there is a problem in that heating expenses are excessively increased. There has been considered a firewood boiler, which heat hot water or heating water by the combustion of scraps of wood, waste wood, firewood, and the like, in order to solve the problem.
[4] However, a general firewood boiler heats a water tank, which stores water, by using heat generated from the combustion of firewood. For this reason, a heat transfer area is small in respect to the amount of water stored in the water tank. Therefore, there is a problem in that much time does need to be taken to heat water.
[5] Further, since heat exchange pipes are arranged in a longitudinal direction so as to be perpendicular to a combustion unit, a heat transfer area is small and hot exhaust gas remains in the combustion unit only for a short time, which causes a thermal efficiency to be decrease. As a result, firewood consumption is increased and heating expenses are increased. Further, since the amount of exhaust gas to be discharged is increased, air pollution is increased.
[6] In addition, since the firewood boiler uses wood as an energy source, a large amount of heat is generated for a short time. However, combustion time is not continued. Accordingly, there is a problem in that it is not possible to make full use of a large amount of heat. Even when an existing regenerative boiler is used together with the firewood boiler, there is a problem in that it is difficult to connect the existing re-
generative boiler to the firewood boiler. Disclosure of Invention
Technical Problem
[7] The present invention has been made to solve the above-mentioned problems, and it is a first object of the present invention to provide an improved firewood boiler. The firewood boiler can be substituted for an electrical boiler or an oil boiler or used together with the boilers in order to heat heating water. Therefore, it is possible to reduce the consumption of energy such as electricity or oil. Further, the combustion heat of the firewood boiler is efficiently used to provide hot water or heating water.
[8] It is a second object of the present invention to provide a firewood boiler that provides a hot- water heat exchange unit in one regenerative heating- water tank even when a midnight regenerative boiler is not provided.
[9]
Technical Solution
[10] According to an aspect of the present invention, a firewood boiler includes a body
10a and heat exchange pipes 14. The body includes a front water tank 12 to which heating water is supplied and a rear water tank 13 from which heating water is discharged. The rear water tank 13 is spaced apart from the front water tank 12. The heat exchange pipes 14 include upper and lower heat exchange pipes 14a and 14b, which are provided at upper and lower portions between the front water tank 12 and the rear water tank 13. A combustion space 15, where the combustion of wood is performed, is defined between the upper and lower heat exchange pipes 14a and 14b. The upper and lower heat exchange pipes 14a and 14b are arranged in a lateral direction with respect to a combustion direction in the combustion space 15.
[11] The firewood boiler may further include a midnight regenerative boiler 30. The midnight regenerative boiler 30 may be connected to a first connecting part 31a that is formed at one horizontal end of a T-shaped connecting pipe 31. A second connecting part 31b may be formed at the other horizontal end of the T-shaped connecting pipe 31, and may be connected to the rear water tank 13 through a heating-water supply line 33 connected to a first electronic valve 32. A third connecting part 31c may be formed at a vertical lower end of the T-shaped connecting pipe 31, and may be connected to an indoor heating- water supply line 35 through an indoor heating- water supply pump 34 and a second electronic valve 34a. An indoor heating- water recover unit of the midnight regenerative boiler 30 may be connected to the inside 100 of a house through an indoor heating- water recovery line 36. The heating-water recover unit of the midnight regenerative boiler 30 may be connected to the front water tank 12 of the firewood boiler 10 through a heating- water recovery line 37 on which a heating- water
recover pump 38 is provided. A temperature sensor 33a may be provided on the heating-water supply line 33 at a position close to the rear water tank 13 of the firewood boiler 10. If the temperature of heating water of the heating- water supply line 33, which is measured by the temperature sensor 33a, is equal to or higher than a predetermined first set temperature, the first electronic valve 32 may be opened.
[12] The firewood boiler may further include a hot- water tank 40. A lower portion of the hot- water tank 40 may be connected to a cold-water supply line 44 on which a cold-water supply pump 43 is provided. The cold-water supply line 44 may be connected to one end of a hot- water heat exchange unit 45 submerged in heating water in the upper water tank 11, which is formed an upper portion of the firewood boiler 10 so as to communicate with front and rear water tanks 12 and 13. The other end of the heat exchange unit 45 may be connected to an indoor hot- water supply line 41, which is provided at an upper portion of the hot- water tank 40, through a hot- water supply line 46. If the temperature of heating water measured by the temperature sensor 33a is equal to or higher than a predetermined second set temperature that is set to be lower than the first set temperature, the cold-water supply pump 43 may be operated.
[13] According to another aspect of the present invention, a firewood boiler includes a body 200a and upper heat exchange pipes 14a. The body includes a front water tank 12 to which heating water is supplied and a rear water tank 13 from which heating water is supplied. The rear water tank is spaced apart from the front water tank 12. The upper heat exchange pipes 14a are formed at an upper portion between the front water tank 12 and the rear water tank 13. A combustion space 203, where the combustion of wood is performed, is defined between the upper heat exchange pipes 14a and a bottom of the body 200a. A flue 201 may be formed at the bottom of the body 200a. An air supply device 210 for supplying outside air is connected to one end of the flue 201. Air supply ports 202 opened toward the rear of the combustion space 203 are formed at the other end of the flue so that the supplied outside air is supplied from the front of the combustion space 203 toward the rear thereof. The upper heat exchange pipes 14a are arranged in a lateral direction with respect to a combustion direction in the combustion space 203.
[14] The firewood boiler may further include a midnight regenerative boiler 30. The midnight regenerative boiler 30 is connected to a first connecting part 31a that is formed at one horizontal end of a T-shaped connecting pipe 31. A second connecting part 31b may be formed at the other horizontal end of the T-shaped connecting pipe 31, and may be connected to the rear water tank 13 through a heating-water supply line 33 connected to a first electronic valve 32. A third connecting part 31c may be formed at a vertical lower end of the T-shaped connecting pipe 31, and may be connected to an indoor heating- water supply line 35 through an indoor heating- water supply pump 34
and a second electronic valve 34a. An indoor heating-water recover unit of the midnight regenerative boiler 30 may be connected to the inside 100 of a house through an indoor heating-water recovery line 36. The heating-water recover unit of the midnight regenerative boiler 30 may be connected to the front water tank 12 of the firewood boiler 200 through a heating- water recovery line 37 on which a heating- water recover pump 38 is provided. A temperature sensor 33a may be provided on the heating- water supply line 33 at a position close to the rear water tank 13 of the firewood boiler 200. If the temperature of heating water of the heating- water supply line 33, which is measured by the temperature sensor 33a, is equal to or higher than a predetermined first set temperature, the first electronic valve 32 may be opened.
[15] The firewood boiler may further include a hot- water tank 40. A lower portion of the hot- water tank 40 may be connected to a cold-water supply line 44 on which a cold-water supply pump 43 is provided. The cold-water supply line 44 may be connected to one end of a hot- water heat exchange unit 220 that is provided around the combustion space 203 of the firewood boiler 200. The other end of the heat exchange unit 220 may be connected to an indoor hot- water supply line 41, which is provided at an upper portion of the hot-water tank 40, through a hot- water supply line 46. If the temperature of hot water measured by a hot- water temperature sensor 221, which is provided at the other end of the hot- water heat exchange unit 220, is equal to or higher than a predetermined set temperature, the cold-water supply pump 43 may be operated.
[16] In the above-mentioned firewood boiler, the air supply ports 202 may be inclined toward an upper side of the combustion space 203.
[17] In the above-mentioned firewood boiler, the air supply ports 202 may be formed at the left and right front portions of the body 200a.
[18] In the above-mentioned firewood boiler, a guide plate 204 may be provided below the upper heat exchange pipes 14a. Further, the guide plate 204 may include an opening 204a formed at the center thereof, and a guide piece 204b that is formed at the periphery of the opening 204a so as to be inclined downward.
[19] The firewood boiler may further include a regenerative heating- water tank 130.
The regenerative heating- water tank 130 may be connected to a first connecting part 31a that is formed at one horizontal end of a T-shaped connecting pipe 31. A second connecting part 31b may be formed at the other horizontal end of the T-shaped connecting pipe 31, and may be connected to the rear water tank 13 through a heating- water supply line 33 connected to a first electronic valve 32. A third connecting part 31c may be formed at a vertical lower end of the T-shaped connecting pipe 31, and may be connected to an indoor heating- water supply line 35 through an indoor heating- water supply pump 34 and a second electronic valve 34a. An indoor heating- water recover unit of the regenerative heating- water tank 130 may be connected to the inside
100 of a house through an indoor heating-water recovery line 36. The heating-water recover unit of the regenerative heating- water tank 130 may be connected to the front water tank 12 of the firewood boiler 10(200) through a heating- water recovery line 37 on which a heating-water recover pump 38 is provided. A temperature sensor 33a may be provided on the heating- water supply line 33 at a position close to the rear water tank 13 of the firewood boiler 10(200). If the temperature of heating water of the heating-water supply line 33, which is measured by the temperature sensor 33a, is equal to or higher than a predetermined first set temperature, the first electronic valve 32 provided on the T-shaped connecting pipe 31 may be opened.
[20] In the above-mentioned firewood boiler, a hot- water heat exchange unit 145 may be provided at an upper portion of the regenerative heating- water tank 13 so as to be submerged in heating water. One end of the hot- water heat exchange unit 145 may be connected to a cold-water supply line 141, and the other end of the hot- water heat exchange unit may be connected to a hot- water supply line 142.
[21] In the above-mentioned firewood boiler, a discharge pipe 1 Ib, which is used to discharge combustion gas generated in the combustion space 15(203), may be formed at the body 10a(200a). The discharge pipe 1 Ib may be connected to the exhaust pipe 50 that is connected to a blast pipe 52 communicating with a blower 51.
Advantageous Effects
[22] The above-mentioned improved firewood boiler according to the present invention includes heating- water pipes and hot- water pipes of which heating regions are horizontally formed in a lateral direction. Further, the whole outer surfaces of the pipes are heated with heating power of firewood. Accordingly, a heat transfer area is large and heat transfer efficiency is high. As a result, it is possible to quickly heat a large amount of water with a little firewood.
[23] Further, since the firewood boiler can be easily connected to a pipe of an existing midnight regenerative boiler by using a T-shaped connecting pipe, it is possible to simply form a system without change in the structure.
[24] Furthermore, the temperature at an upper portion of the firewood boiler is very high. Accordingly, when water in a water supply tank is circulated to the upper portion of the firewood boiler, it is possible to obtain hot water from heat stored in water of the water supply tank.
[25] In addition, it is possible to control heating power or the combustion time of firewood by controlling the amount of air blown by an exhaust gas blower. Therefore, it is possible to heat heating water or hot water up to the desired temperature, and to estimate or guess time to replenish firewood. As a result, it is possible to obtain an advantage of conveniently using the firewood boiler.
[26] Further, when an existing midnight regenerative boiler is not provided, a separate regenerative heating-water tank is provided and a hot- water heat exchange unit is provided in the regenerative heating- water tank. As a result, since a separate hot- water tank does not need to be provided, there is an advantage that the structure of a system is simple.
Brief Description of the Drawings [27] FIG. 1 is a view showing an entire system that includes a firewood boiler according to the present invention. [28] FIG. 2 is a longitudinal cross-sectional perspective view of the firewood boiler according to the present invention. [29] FIG. 3 is a lateral cross-sectional perspective view of the firewood boiler according to the present invention. [30] FIG. 4 is a longitudinal cross-sectional view of the firewood boiler according to the present invention. [31] FIG. 5 is a lateral cross-sectional view of the firewood boiler according to the present invention. [32] FIG. 6 is a view illustrating the operation of the firewood boiler, when a heating switch is not operated indoors. [33] FIG. 7 is a view illustrating the operation of the firewood boiler, when the heating switch is operated indoors and the temperature of heating water at an outlet of the firewood boiler is lower than a predetermined temperature. [34] FIG. 8 is a view illustrating the operation of the firewood boiler, when the heating switch is operated indoors and the temperature of heating water at the outlet of the firewood boiler is equal to or higher than a predetermined temperature. [35] FIG. 9 is a view showing a firewood boiler according to a second embodiment of the present invention. [36] FIG. 10 is a view showing an entire system that includes a firewood boiler according to a third embodiment of the present invention. [37] FIG. 11 is a longitudinal cross-sectional perspective view, which includes a partial cross section, of the firewood boiler according to the third embodiment of the present invention. [38] FIG. 12 is a lateral cross-sectional perspective view of the firewood boiler according to the third embodiment of the present invention. [39] FIG. 13 is a cross-sectional view taken along line A-A of FIG. 10.
[40] FIG. 14 is a cross-sectional view taken along line B-B of FIG. 10.
[41] FIG. 15 is a view showing a firewood boiler according to a fourth embodiment of the present invention.
Best Mode for Carrying Out the Invention
[42] Preferred embodiments of the present invention will be described in detail below with reference to accompanying drawings.
[43] FIG. 1 is a view showing an entire system that includes a firewood boiler according to the present invention. FIG. 2 is a longitudinal cross-sectional perspective view of the firewood boiler according to the present invention. FIG. 3 is a lateral cross-sectional perspective view of the firewood boiler according to the present invention. FIG. 4 is a longitudinal cross-sectional view of the firewood boiler according to the present invention. FIG. 5 is a lateral cross-sectional view of the firewood boiler according to the present invention.
[44] As shown in FIG. 1, a firewood boiler 10 according to the present invention may be connected to a midnight regenerative boiler 30 and a hot- water tank 40.
[45] As shown in FIGS. 2 and 3, the firewood boiler 10 has the shape of a rectangular parallelepiped, and includes a body 10a. The body 10a is provided with an upper water tank 11 at the upper portion thereof, and a pair of side water tanks 1 Ia on both sides of the upper water tank 11. The upper water tank 11 has the shape of a horizontal rectangular parallelepiped, and each of the side water tanks 11a has the shape of a rectangular parallelepiped.
[46] A discharge pipe 1 Ib, which extends from the bottom of the upper water tank 11 and is used to discharge combustion gas, protrudes from the upper surface of the upper water tank 11.
[47] A front water tank 12, which has the shape of a vertical rectangular parallelepiped, is formed at the front of the upper water tank 11 and the pair of side water tanks 1 Ia. A rear water tank 13, which has the shape of a vertical rectangular parallelepiped, is formed at the rear of the upper water tank 11 and the pair of side water tanks 1 Ia so as to be spaced apart from the front water tank 12.
[48] An opening 12a through which firewood is replenished is formed at the middle portion of the front water tank 12, and a heating water inlet 12b is formed at the lower portion of the front water tank. The opening 12a may be opened or closed by a hinged lid 21.
[49] A heating water outlet 13a is formed at the upper portion of the rear water tank 13.
[50] The front water tank 12 and the rear water tank 13 are connected with each other at the upper and lower portions thereof by a plurality of heat transfer pipes 14a and 14b. The upper heat exchange pipes 14a are arranged in several rows, and the rows are arranged in zigzags. The lower heat exchange pipes 14b are arranged in a single row.
[51] A space between the pipes 14a and 14b is defined as a combustion space 15 by the upper and lower heat exchange pipes 14a and 14b. Exhaust gas, which is generated
during the combustion of wood, is discharged through the discharge pipe 1 Ib formed on the upper surface of the combustion space 15.
[52] An ash receiver 22 is provided below the lower pipes 14b at the lower portion of the firewood boiler 10. Ash generated due to the combustion of wood falls onto the ash receiver 22 through gaps, which are formed between lower heat exchange pipes 14b, and then piles up on the ash receiver 22.
[53] The midnight regenerative boiler 30 is an electric boiler having been known in the art, and is connected to the firewood boiler 10.
[54] A first connecting part 3 Ia of a T-shaped connecting pipe 31 is connected to a heating water pipe, which is formed at the upper portion of the midnight regenerative boiler 30, as shown in FIG. 6. A first electronic valve 32 is connected to a second connecting part 31b of the T-shaped connecting pipe 31, and the first electronic valve 32 is connected to a heating-water supply line 33. The heating-water supply line 33 is connected to the heating water outlet 13a of the firewood boiler 10. Meanwhile, a temperature sensor 33a is provided on the heating-water supply line 33 so as to be close to the heating water outlet 13a of the firewood boiler 10.
[55] Further, a third connecting part 31c, which is used as an indoor heating water supply part, of the T-shaped connecting pipe 31 is perpendicular to the ground. In addition, an indoor heating- water supply pump 34 and a second electronic valve 34a are provided on the third connecting part. The third connecting part is connected to the inside 100 of a house through an indoor heating- water supply line 35.
[56] If the T-shaped connecting pipe 31 is connected to the midnight regenerative boiler
30 as described above, it is possible to connect the firewood boiler 10 to the existing midnight regenerative boiler 30 without significantly changing the structure of the existing midnight regenerative boiler.
[57] An indoor heating- water recovery line 36 is formed at the lower portion of the midnight regenerative boiler 30. Indoor heating water, which is cooled after heating the inside 100 of a house, is recovered to the midnight regenerative boiler 30 through the indoor heating- water recovery line 36.
[58] Meanwhile, another port is formed at the lower portion of the midnight regenerative boiler 30, and is connected to the inlet 12b of the firewood boiler 10 through a heating- water recovery line 37 on which a heating- water recover pump 38 for the firewood boiler is provided.
[59] A hot- water tank 40 may be further connected to the firewood boiler 10 according to the present invention.
[60] An indoor hot- water supply line 41 and a cold-water replenishing line 42 are formed at the upper portion of the hot- water tank 40. The indoor hot- water supply line 41 is used to supply hot water to a desired spot such as the inside of a house. The cold-
water replenishing line 42 is used to replenish the hot-water tank 40 with cold-water, which is to be used as the supplied indoor hot water.
[61] If hot water in the hot- water tank 40 is cooled, the hot water in the hot- water tank is supplied to the firewood boiler 10 through a cold-water supply line 44 by a cold-water supply pump 43. The cold-water supply line 44 is connected to one end of a hot- water heat exchange unit 45, which is bent at several positions. The other end of the hot- water heat exchange unit 45 is connected to the upper portion of the hot- water tank 40 through a hot-water supply line 46.
[62] The hot- water heat exchange unit 45 includes a plurality of U-shaped bending portions, which are connected to each other, to perform heat exchange, and is provided to be submerged in the heating water in the upper water tank 11 while being parallel to the heat exchange pipes 14a.
[63] Meanwhile, a blast pipe 52 connected to an exhaust gas blower 51 is connected to an exhaust pipe 50 that is connected to the discharge pipe 1 Ib of the firewood boiler 10. The blast pipe 52 is disposed so as to correspond to a flow direction of exhaust gas. Accordingly, a flow direction of air blown by the blower 51 corresponds to a flow direction of the exhaust gas.
[64] The operation of the firewood boiler according to the present invention will be described below with reference to FIGS. 6 to 8.
[65] FIG. 6 is a view illustrating the operation of the firewood, when a heating switch
101 is not operated indoors. When the heating- water recover pump 38 is operated, the heating water of the midnight regenerative boiler 30 is supplied to the front water tank 12 of the firewood boiler 10 through the heating- water recovery line 37 and the inlet 12b.
[66] As show in FIG. 2, the heating water supplied to the front water tank 12 flows to the rear water tank 13 through the upper water tank 11, the side water tanks 11a, and the upper and lower heat exchange pipes 14a and 14b. While flowing as described above, the heating water is heated by the combustion heat that is generated in the combustion space 15 due to the combustion of wood. When the heating water flows only in the heat exchange pipes 14a and 14b and the sufficient amount of heating water causing bubbles in the heating water is not ensured, the side water tanks 11a ensures the amount of heating water.
[67] In this case, since the heat exchange pipes 14a and 14b are provided in a lateral direction with respect to the combustion space and the rows of the heat exchange pipes are arranged in zigzags, it is possible to ensure sufficient heat transfer time and heat transfer efficiency. Considering that the existing boiler does not ensure sufficient heat transfer time and heat transfer efficiency because heat exchange pipes are vertically provided in a combustion space of the existing boiler, the above-mentioned structure
can have heat exchange efficiency higher than the heat exchange efficiency of the existing boiler.
[68] Meanwhile, when the temperature of the heating water that is measured by the temperature sensor 33a is equal to or higher than a predetermined first set temperature, that is, a temperature of 80 0 C to 90 0 C, the heating-water recover pump 38 is operated and the first electronic valve 32 is opened. Accordingly, the heating water collected in the rear water tank 13 is supplied to the midnight regenerative boiler 30 through the outlet 13a, the heating-water supply line 33, the first electronic valve 32, and the second and first connecting parts 31b and 31a of the T-shaped connecting pipe 31. Then, the heating water is stored in the midnight regenerative boiler 30 while having heat.
[69] FIG. 7 is a view illustrating the operation of the firewood boiler, when the heating switch 101 is operated indoors and the temperature of heating water at the outlet of the firewood boiler is lower than a predetermined temperature.
[70] When an operator operates the heating switch 101 in the inside 100 of the house, the indoor heating-water supply pump 34 is operated and the second electronic valve 34a is opened. Accordingly, heating water is supplied to the inside 100 of the house. In this case, the spots to which heating water is supplied are changed depending on the temperature of heating water at the outlet of the firewood boiler 10.
[71] When the temperature measured by the temperature sensor 33a, which is provided at the outlet of the firewood boiler 10, is lower than a predetermined set temperature, for example, 8O 0 C, as shown in FIG. 7, the heating water stored in the midnight regenerative boiler 30 is supplied to the inside 100 of the house through the first and third connecting parts 31a and 31c in order to perform heating. In this case, since the first electronic valve 32 is closed, the heating water supplied from the firewood boiler 10 is not supplied to indoor heating water.
[72] FIG. 8 is a view illustrating the operation of the firewood boiler, when the heating switch 101 is operated indoors and the temperature of heating water at the outlet of the firewood boiler is equal to or higher than a predetermined temperature.
[73] When the temperature measured by the temperature sensor is higher than a predetermined temperature, for example, 8O 0 C, as shown in FIG. 8, the first electronic valve 32 is opened and heating water is supplied from the firewood boiler 10 to indoor heating water through the second and third connecting parts 31b and 31c of the T- shaped connecting pipe 31. In this case, the heating water of the midnight regenerative boiler is not supplied to the indoor heating water.
[74] That is, due to the above-mentioned operation, hotter one of the heating water in the firewood boiler 10 and the midnight regenerative boiler 30 is supplied to the inside of the house. Therefore, it is possible to ensure the reliability of the boiler.
[75] In general, during the operation of the firewood boiler 10 according to the present invention, the midnight regenerative boiler 30 is not operated and the heating-water tanks provided in the midnight regenerative boiler 30 are used. The midnight regenerative boiler 30 may be complementarily operated, if necessary.
[76] Next, the operation for supplying hot water in the first embodiment of the present invention will be described.
[77] When the temperature of the heating water measured by the temperature sensor
33a, which is provided on the heating-water supply line 33, is equal to or higher than a second set temperature, for example, 7O 0 C, which is lower than the first set temperature, during the operation of the firewood boiler 10, the cold-water supply pump 43 is operated. Accordingly, heating water, which is used to produce hot water, is supplied to the hot- water heat exchange unit 45 provided in the upper water tank 11. After hot water of the hot- water heat exchange unit 45 absorbs heat from the heating water of the upper water tank 11, the hot water of the heat exchange unit is supplied to the hot-water tank 40 through the hot- water supply line 46 and is then stored in the hot- water tank while having heat.
[78] Therefore, when a user opens a hydrant (faucet) to use hot water, hot water is supplied through the indoor hot- water supply line 41. It is possible to more efficiently use heat, which is generated from the firewood boiler 10, due to the above-mentioned operation.
[79] Meanwhile, according to the present invention, it is possible to control the combustion time or heating power of the firewood boiler 10 by adjusting the amount of air blown by the exhaust gas blower 51.
[80] When the amount of air blown by the exhaust gas blower 51 is increased to the maximum extent, the speed of the exhaust gas flowing in the exhaust pipe 50 is increased. Accordingly, the heating power of the firewood boiler becomes maximum, and the combustion time thereof becomes minimum. In contrast, when the amount of air blown by the exhaust gas blower 51 is decreased to the minimum extent or the exhaust gas blower is not operated, the speed of the exhaust gas flowing in the exhaust pipe 50 is decreased to the minimum extent. Accordingly, the heating power of the firewood boiler 10 becomes minimum, and the combustion time thereof becomes maximum. As described above, it is possible to control the combustion in the firewood boiler. Mode for the Invention
[81] [Second Embodiment]
[82] A second embodiment, which is another embodiment, of the present invention will be described below with reference to FIG. 9.
[83] A second embodiment has basically the same structure as the first embodiment.
According to the first embodiment, the tank of the existing midnight regenerative boiler is used as a regenerative heating-water tank of the firewood boiler. However, according to a second embodiment, a separate regenerative heating- water tank 130 is used instead of the existing midnight regenerative boiler.
[84] Only the structure different from the first embodiment will be described below.
[85] First, the structure of a firewood boiler 10 is the same as that of the firewood boiler of the first embodiment. A second embodiment is different from the first embodiment in that the upper water tank 11 including the hot- water heat exchange unit 45 is not provided.
[86] Further, a regenerative heating- water tank 130 is used instead of the midnight regenerative boiler 30. A T-shaped connecting pipe 31 that is connected to a heating- water supply line 33 and an indoor heating- water supply line 35, an indoor heating- water recovery line 36, and a heating-water recovery line 37 are connected to the regenerative heating- water tank 130 in the same manner as the first embodiment.
[87] Meanwhile, a hot-water tank 40 is not provided, and a hot- water heat exchange unit
145 is provided to be submerged in heating water at an upper portion of the regenerative heating- water tank 130 instead of in the upper water tank 11 of the firewood boiler 10.
[88] The operation during heating is the same as in the first embodiment, and the operation during the supply of hot water will be described below. Cold-water is supplied from a cold-water source (not shown) to the hot- water heat exchange unit 145 through a cold-water replenishing line 141. While passing through the hot-water heat exchange unit 145, the cold-water absorbs heat from heating water in the regenerative heating- water tank 130 and is then supplied to spots (not shown), where hot water is needed, in the inside 100 of the house through a indoor hot- water supply line 142.
[89] According to the above-mentioned structure, when an existing midnight regenerative boiler is not provided, a separate regenerative heating- water tank is provided instead of the existing midnight regenerative boiler and a hot- water heat exchange unit is provided. As a result, it is possible to simply form the entire system.
[90] [Third Embodiment]
[91] A third embodiment, which is still another embodiment, of the present invention will be described with reference to FIGS. 10 to 14. FIG. 10 is a view showing an entire system that includes a firewood boiler according to a third embodiment of the present invention. FIG. 11 is a longitudinal cross-sectional perspective view, which includes a partial cross section, of the firewood boiler according to the third embodiment of the present invention. FIG. 12 is a lateral cross-sectional perspective view of the firewood boiler according to the third embodiment of the present invention. FIG. 13 is a cross-
sectional view taken along line A-A of FIG. 10. FIG. 14 is a cross-sectional view taken along line B-B of FIG. 10.
[92] The entire system including a firewood boiler according to a third embodiment of the present invention has the same structure as the system that is shown in FIG. 1 and includes the firewood boiler according to the first embodiment of the present invention, except for the structures related to a firewood boiler 200, an air supply device 210, and a hot- water heat exchange unit 220.
[93] First, a body 200a of the firewood boiler 200 according to the third embodiment includes only upper heat exchange pipes 14a, and does not include lower heat exchange pipes 14b. Therefore, a combustion space 203 is defined by the upper heat exchange pipes 14a and a bottom of the body 200a.
[94] Since lower heat exchange pipes 14b are not provided in the body, it is possible to prevent the difficulty in the combustion of firewood that is caused by low temperature of heating water passing through the lower heat exchange pipes 14b in the first embodiment.
[95] A flue 201 is formed at the bottom of the body 200a, and, a pipe 211 of an air supply device 210 is connected to the rear portion of the flue 201.
[96] Further, two air supply ports 202 are formed at the left and right front portions on the upper surface of the flue 201 so as to communicate with the flue 201. As shown in FIG. 13, the air supply ports 202 are opened toward the rear of the firewood boiler 200, and are inclined upward from the front of the firewood boiler 200 toward the rear thereof. Furthermore, as shown in FIG. 14, the air supply ports 202 may be preferably oriented by 15°so as to face a central portion of the combustion space 203.
[97] The air supply ports 202 are formed not at the central portion of the body 200a of the firewood boiler 200 but at both side portions thereof. The reason for this is to prevent the occurrence of the following problem. That is, if the air supply ports 202 are formed at the central portion of the body of the firewood boiler, flame or combustion gas such as soot is not normally discharged to the outside through the discharge pipe 1 Ib but discharged by a front lid 21 of the body 200a due to the combustion of wood at the central portion.
[98] A guide plate 204 is provided at the lowermost portion of the upper heat exchange pipes 14a. The guide plate 204 includes an opening 204a formed at the center thereof, and a guide piece 204b, which is inclined downward and has a shape of a flat plate, formed at the periphery of the opening 204a.
[99] The air supply device 210 includes the pipe 211 that is connected to the flue 201, and a pump 213 that is provided on the middle portion of the pipe 211 and operated by a motor 212.
[100] According to the third embodiment, the hot- water heat exchange unit 220 is formed
of one pipe that extends to surround the left, right, and rear sides of the combustion space 203. A cold-water supply line 44 is connected to a hot- water inlet, which is one end of the hot- water heat exchange unit 220, at the lower portion on the rear side of the firewood boiler 200. A hot- water supply line 46 is connected to an outlet, which is the other end of the hot- water heat exchange unit 220, at the upper portion on the rear side of the firewood boiler 200.
[101] Meanwhile, a hot- water temperature sensor 221 is provided at the outlet of the hot- water heat exchange unit 220.
[102] Next, the operation of the firewood boiler according to the third embodiment of the present invention will be described.
[103] The operations for heating and supplying heating water are the same as in the first embodiment, but the combustion in the firewood boiler 200 is different from the first embodiment. Accordingly, the combustion in the firewood boiler will be described below.
[104] First, the pump 213 of the air supply device 210 is operated to forcibly supply outside air through the pipe 211, and the supplied air is supplied to the combustion space 203 through the flue 201 and the air supply ports 202.
[105] Since the air supply ports 202 are inclined upward, outside air is discharged to the upper portions of the combustion space 203 while passing through the air supply ports 202. Then, the air is guided by the guide piece 204b and swirls. As a result, the combustion of wood is facilitated.
[106] As described above, the air supply device 210 supplies the sufficient amount of air required for the combustion to the firewood boiler 200 according to the third embodiment, and the air swirls. Therefore, it is possible to obtain an advantage of maximizing combustion efficiency. The air supply device 210 may be continuously operated during the operation of the firewood boiler, or may be operated only at the beginning of the operation of the firewood boiler, if necessary.
[107] In addition, gas, which has been already used in the combustion and is not helpful any more in the combustion, remains in the combustion space 203. In this case, since an exhaust gas blower 51 discharges the above-mentioned gas to the outside, it is possible to achieve optimization of the combustion.
[108] Combustion efficiency is further improved in the firewood boiler 200 according to the third embodiment as described above. In particular, even when wood with a lot of pine resin such as fir, or wood having foreign substances on the surface thereof such as waste wood is used as the firewood, it is possible to significantly reduce soot and smoke.
[109] The operation for heating and supplying hot water will be described below.
[110] In the firewood boiler 200 according to the third embodiment, the hot- water heat
exchange unit 220 is not provided to be submerged in heating water in the upper water tank 11 that is formed at an upper portion of the firewood boiler 10, but provided around the combustion space 203. Accordingly, it is possible to easily heat hot water up to the high temperature by directly using radiant heat generated due to the combustion of wood.
[I l l] Meanwhile, the control of hot water will be described below. According to the first embodiment, the temperature of heating water is measured by the temperature sensor 33a. If the temperature by the temperature sensor is higher than the second set temperature, the cold-water supply pump 43 is operated and the heated hot water is supplied to the hot-water tank 40. However, according to the third embodiment, if the temperature of hot water measured by the hot- water temperature sensor 221, which is provided at the outlet of the hot- water heat exchange unit 220, is higher than a predetermined set temperature, for example, 8O 0 C, the cold-water supply pump 43 is operated.
[112] [Fourth Embodiment]
[113] FIG. 15 is a view showing a fourth embodiment of the present invention.
[114] A fourth embodiment, which is another embodiment, of the present invention is an embodiment where a firewood boiler 200 is connected to a separate regenerative heating- water tank 130 instead of a midnight regenerative boiler in the third embodiment, like the second embodiment.
[115] Only the structure different from the third embodiment will be described below.
[116] First, the firewood boiler 200 has the same structure as the firewood boiler according to the third embodiment, except that a hot- water heat exchange unit 220 is not provided in a combustion space 203.
[117] Further, a regenerative heating-water tank 130 is used instead of the midnight regenerative boiler 30. A T-shaped connecting pipe 31 that is connected to a heating- water supply line 33 and an indoor heating- water supply line 35, an indoor heating- water recovery line 36, and a heating-water recovery line 37 are connected to the regenerative heating- water tank 130 in the same manner as the third embodiment.
[118] Meanwhile, a hot- water tank 40 is not provided, and a hot- water heat exchange unit
145 is provided to be submerged in heating water at an upper portion of the regenera tive heating- water tank 130.
[119] The operation during heating is the same as in the third embodiment, and the operation during the supply of hot water will be described below. Cold-water is supplied to the hot- water heat exchange unit 145 through a cold-water replenishing line 141. While passing through the hot- water heat exchange unit 145, the cold-water absorbs heat from heating water in the regenerative heating- water tank 130 and is then supplied to the inside 100 of the house through a indoor hot- water supply line 142.
According to the above-mentioned structure, like the second embodiment, when a midnight regenerative boiler is not provided, a separate regenerative heating-water tank is provided instead of the midnight regenerative boiler and a hot- water heat exchange unit is provided. As a result, it is possible to simply form a system.