Nah, Kyu-dong (#110-303 Hwasung APT, Singi-dong Dong-ku, Daegu 701-758, KR)
| 1. | An apparatus for manufacturing ASCON by mixing an asphalt and a pavement material comprising: an asphalt reservoir for storing and supplying the asphalt; a feeder part for supplying the pavement material; a weighing part for supplying the asphalt and the pavement materials in a desired ratio; a mixing part for mixing the supplied asphalt and pavement material; a circulation line of hot oil medium which circulates the asphalt reservoir, the weighing part and the mixing part to prevent the asphalt from being solidified; a heating part installed on the circulation line for heating the hot oil medium when it circulates the line; and a heat exchange part installed on the circulation line for storing the heat during operation of the apparatus and supplying the heat to the asphalt during operation interruption of the apparatus. |
| 2. | An apparatus as claimed 1, wherein the heat exchange temperature is 851000C. |
| 3. | An apparatus as claimed 2, wherein the heat exchange part comprises a regeneration band filled by the latentregenerative material; a pipe line of hot oil medium which is connected to the above circulation line, supplies the hot oil medium to the heat exchange part, circulates through inside of the regenerative band, and discharges to the circulation line of the hot oil medium; and an external container which wraps and isolates the regenerative band from the outside. |
| 4. | An apparatus as claimed 3, wherein the latentregenerative material shows phase transfer at 10011O0C and stores heat. |
| 5. | An apparatus as claimed 4, wherein the latentregenerative material is a slurry material produced by mixing an oxide and water in the ratio of one to one. |
| 6. | An apparatus as claimed 5, wherein the oxide is composed of silicon dioxide 7484 volume %, aluminum oxide 7.615.6 volume %, calcium oxide 1.02.2 %, magnesium oxide 1.02.2 volume %, potassium oxide 1.02.2 volume %, sodium oxide 3.44.6 volume % and iron oxide 0.61.8 volume %, and sum of the each oxides is 100 volume %. |
| 7. | An apparatus as claimed 6, further comprising a hot oil medium layer wherein the hot oil medium layer is installed to wrap the regenerative band at between the regenerative band and the external container and the hot oil medium traveling the pipe line is filled inside thereof. |
| 8. | 8An apparatus as claimed 7, further comprising a supplementary reservoir wherein the supplementary reservoir is installed on the upper part of the external container, is connected to the circulation line of the hot oil medium, and when the volume of the hot oil medium is increased, the hot oil medium flows into the reservoir. |
| 9. | An apparatus as claimed 8, wherein the supplementary reservoir additionally includes a hot oil medium input where the hot oil medium can be injected. |
| 10. | An apparatus as claimed 9, further comprising a supplementary heat source wherein the supplementary heat source is installed inside the external container for heating the hot oil medium and the latentregenerative material. |
| 11. | An apparatus as claimed 10, wherein the supplementary heat source is an electric heater. |
| 12. | An apparatus as claimed 11, wherein the supplementary heat source is controlled to operate when temperature of the hot oil medium and the latentregenerative material is decreased to a predetermined temperature. |
| 13. | An apparatus as claimed 12, wherein the predetermined temperature is set up 50C higher than phase transfer temperature of the asphalt. |
| 14. | An apparatus as claimed 13, further comprising a temperature sensor wherein the temperature sensor is formed on the both ends of the pipe line of the hot oil medium and inside of the regenerative band for controlling the supplementary heat source by measuring temperature of the hot oil medium and the latent regenerative material. |
| 15. | An apparatus as claimed 14, further comprising a measuring part of the hot oil medium wherein the measuring part is formed on the upper part of the hot oil medium layer for measuring a level of the hot oil medium filled in the hot oil medium layer. |
| 16. | An apparatus for manufacturing an ASCON by mixing of a asphalt and a pavement material, comprising: an asphalt reservoir for storing and supplying the asphalt; a feeder part for supplying the pavement materials; a weighing part for supplying the asphalt and the pavement materials in a desired ratio; a mixing part for mixing the supplied asphalt and the pavement materials; a circulation line of hot oil medium which circulates the asphalt reservoir, the weighing part and the mixing part to prevent the asphalt from being solidified; and a heating part installed on the circulation line for heating the hot oil medium when it circulates the line, wherein the heating part includes a heat exchange part installed on the circulation line for storing the heat during operation of the apparatus and supplying the heat to the asphalt during operation interruption of the apparatus. |
| 17. | An apparatus as claimed 16, wherein the heat exchange part comprises a regenerative band filled by the latentregenerative material; a pipe line of hot oil medium which is connected to the above circulation line, supplies the hot oil medium to the heat exchange part, circulates through inside of the regenerative band, and then discharges to the circulation line of the hot oil medium; and an external container which wraps and isolates the regenerative band from the outside. |
| 18. | An apparatus as claimed 17, wherein the latentregenerative material shows phase transfer at 10011O0C and stores heat. |
| 19. | An apparatus as claimed 18, wherein the latentregenerative material is a slurry material produced by mixing an oxide and water in the ratio of one to one. |
| 20. | An apparatus as claimed 19, wherein the oxide is composed of silicon dioxide 7484 volume %, aluminum oxide 7.615.6 volume %, calcium oxide 1.02.2 %, magnesium oxide 1.02.2 volume %, potassium oxide 1.02.2 volume %, sodium oxide 3.44.6 volume % and iron oxide 0.61.8 volume %, and sum of the each oxides is 100 volume %. |
APPARATUS FOR MANUFACTURING ASCON
Technical Field
[1] The present invention relates to an apparatus for manufacturing ASCON, and more particularly to an apparatus provided with an additional heat exchange part where a regenerative material is used to maintain the asphalt in the fluid state during discontinuance of an apparatus, and to reduce energy consumption when it is operated again. Background Art
[2] ASCON stands for asphalt concrete and is known to other names such as asphalt, asphalt mixture, asphalt concrete, hot mixture and HMA (hot mix asphalt).
[3] A typical ASCON is a mixture of asphalt, rocks, gravels, and filler for pavement prepared at room temperature or heating condition, mainly used for road pavement and parking area, and it is differentiated depending on purpose of application, use, function and construction method.
[4] The ASCON manufacturing process is described in Fig. 1. Fig. 1 shows an illustrative view of ASCON manufacturing apparatus. Apparatus for manufacturing ASCON (1) is composed of the asphalt reservoir (10), the feeder part of the pavement material (20), the weighing part (30) and the mixing part (40). The asphalt reservoir (10) stores the asphalt in the fluid state and supplies to the weighing part (30). In addition, the feeder part of the pavement material (20) supplies materials such as lime powder, gravels, lime mixture and sand to the weighing part (30). The asphalt and the pavement materials provided are weighed in the desired ratio, and then transferred to the mixing part (40). Then, the asphalt and the pavement material provided from the weighing part are mixed in the mixing part (40) to prepare ACSON.
[5] Since the asphalt solidifies at below 85 0 C , during ASCON manufacturing process, temperature of the asphalt, fuel (bunker C or petroleum oil), the weighing apparatus and the mixing apparatus should be maintained at 140-150 0 C so that the asphalt which is transferred from the reservoir by the transfer pump is able to be sprayed.
[6] In order to maintain temperature as shown in Fig. 1, the circulation line of the hot oil medium (50), which circulates through the asphalt reservoir (10), the weighing part (30) and the mixing part (40), is further prepared and the hot oil medium is heated by the heating part (60) such as a gasoline burner or an electric heater and circulates for indirect heating by the pump. In order to spray the asphalt, temperature of the hot oil medium is increased in the range of 150-160 0 C, and then the hot oil medium circulates to maintain temperature of the asphalt in the reservoir, the weighing apparatus and the
mixing apparatus at 140-150 0 C.
[7] However, as the heat capacity of a gasoline burner which is mainly used to heat the asphalt is 400,000 Kcal/h, it faces on the low heat efficiency caused by discharging the hot exhaust gas to air and declining burner. Meanwhile, due to the higher heat efficiency and the less fuel expense than a gas burner, the electric heater is generally used, however, since the capacity of the electric heater is 240 kw, the large amount of electricity is necessary. Therefore, the techniques and the apparatuses for maximum heat efficiency and minimum energy loss are disclosed in the Korean Utility Model No. 0255883, the Korean Utility Model No. 0364962 and the Korean Patent No. 0375968.
[8] However, the intrinsic problems for heating of the asphalt in the ASCON manufacturing process are followed; Generally, the number of the operation days of ASCON manufacturing apparatus is 150 days per year and the number of hours is 12 hours per day. Meanwhile, the apparatus is not operated everyday consecutively but manufactured if necessary. Therefore, the ASCON manufacturing apparatus is prone to be operated for a certain period of time followed by a few days of discontinuance.
[9] Though, for ASCON manufacturing as described above, the desired temperature of the asphalt should be maintained to be able to operate properly. Generally, it takes 2-3 days to increase temperature to 145 0 C or higher to manufacture ASCON from the complete discontinuance of operation. Without pre -heating of the asphalt, it takes 2-3 days to manufacture ASCON, it occasionally happens shortage of ASCON to supply. It causes a factor decreasing efficiency of the factory management. Meanwhile, in the case of maintaining temperature of the asphalt at 145 0 C or higher consistently, it results in a long operation period of the boiler until the following operation for manufacturing is opened again, and it also consumes large amount of oil and electricity. Disclosure of Invention Technical Problem
[10] The inventor of the present invention investigated the physical properties of the asphalt to solve the problems of ASCON manufacturing apparatus as described above. As the general physical properties of the asphalt is determined, it forms a solid at room temperature, then turns to a fluid at softening temperature, approximately 85-100 0 C, and the specific heat is approximately 0.40 kcal/kg°C at 0-100 0 C, 0.45 kcal/kg°C at 100-200 0 C, 0.50 kcal/kg°C at over 200 0 C, meanwhile the latent heat to get phase transfer from the solid to the fluid is 35 kcal/kg.
[11] Therefore, the heat capacity required to increase temperature of the asphalt from room temperature, 2O 0 C to 145 0 C is shown briefly in the folio wings; the heat capacity to increase temperature from 2O 0 C to 100 0 C is required 32 kcal/kg, the heat capacity to
get phase transfer at the same temperature is required the additional 67 kcal/kg, the heat capacity to be able to eject the asphalt, where it is softened at 100 0 C, is required 20 kcal/kg, and overall 120 kcal/kg of the heat capacity is required.
[12] The following 3 cases are compared to determine the required heat capacity; 1,
Increase temperature of the asphalt from room temperature 2O 0 C to 145 0 C to manufacture ASCON, 2. Temperature of the asphalt, 145 0 C obtained during ASCON manufacturing is maintained at 6O 0 C without additional heating after ASCON manufacturing is discontinued, and then heat again to 145 0 C in the next ASCON manufacturing; 3. Temperature of the asphalt, 145 0 C obtained during ASCON manufacturing, is maintained at 100 0 C with pre-heating after ASCON manufacturing is discontinued, and then heat again to 145 0 C in the next ASCON manufacturing.
[13] It consumes 120 kcal/kg in the case 1, 104 kcal/kg in the case 2 and 36 kcal/kg in the case 3. When compared, the case 3 saves over 65 % of energy consumption than the case 2. Furthermore, in view of the typical scale of 200,000-300,000 liters of the reservoir capacity, energy expenditure can be saved. Therefore, lots of energy is c onsumed at the phase transfer of the asphalt in ASCON manufacturing apparatus, and it is important to maintain the certain temperature to get fluidity. Since the lowest temperature to maintain fluidity is 85-100 0 C, the asphalt is pre-heated consistently and the additional heating is followed in the next ASCON manufacturing, then the energy expenditure can be saved. In addition, the number of heating hours of the asphalt is also reduced so that it can be corresponded flexibly to ASCON supply.
Technical Solution
[14] In order to maintain temperature of the asphalt at over 85 0 C by the heat exchange part during discontinuance of ASCON manufacturing, the present invention provides ASCON manufacturing apparatus which can reduce the required energy consumption to operate the apparatus again. Brief Description of the Drawings
[15] Fig. 1 is a general view showing the structure of the conventional ASCON manufacturing apparatus.
[16] Fig. 2 is an illustrative view of the present invention showing the structure of
ASCON manufacturing apparatus in accordance with one embodiment of of the present invention.
[17] Fig. 3 is an illustrative cross-sectional view showing the structure of the heat exchange part in accordance with one embodiment of of the present invention.
[18] Fig. 4 is an illustrative trans-sectional view showing the structure of the heat exchange part in accordance with one embodiment of of the present invention.
[19] Fig. 5 is another illustrative view showing the structure of ASCON manufacturing
apparatus in accordance with another embodiment of of the present invention. Best Mode for Carrying Out the Invention
[20] To accomplish the purpose described above, the present invention in the ASCON manufacturing apparatus that produces ASCON by mixing the asphalt and the pavement materials provides ASCON manufacturing apparatus comprising the following; the asphalt reservoir which stores and supplies the asphalt; the feeder part of the pavement materials which supplies the pavement materials; the weighing part which supplies the asphalt and the pavement materials in the desired ratio; the mixing part which mixes the asphalt and the pavement materials received; the circulation line of the hot oil medium which circulates the asphalt reservoir, the weighing part and the mixing part to prevent solidification of the asphalt; the heating part, which is installed on the circulation line, to heat the hot oil medium when it circulates the line; the heat exchange part, which installed on the circulation line, to store during operation of the apparatus and radiate heat to the asphalt during discontinuance of the apparatus.
[21] In addition to the present invention in the ASCON manufacturing apparatus that manufacture ASCON by mixing the asphalt and the pavement materials, the apparatus comprises the asphalt reservoir which stores and supplies the asphalt; the feeder part of the pavement materials which supplies the pavement materials; the weighing part which supplies the asphalt and the pavement materials in the desired ratio; the mixing part which mixes the asphalt and the pavement materials received; the circulation line of the hot oil medium which circulates the asphalt reservoir, the weighing part and the mixing part to prevent solidification of the asphalt; the heating part, which is installed on the circulation line, to heat the hot oil medium when it circulates the line, in addition, it provides ASCON manufacturing apparatus representing the distinctive heat exchange arrangement that the heating part stores the heat during operation of the apparatus and radiates to heat the asphalt during discontinuance of the apparatus.
[22] The detailed examples of the present invention are explained with referring the attached figures.
[23] <Pref erred Embodiment 1>
[24] Fig. 2 is a general view of the ASCON manufacturing apparatus (100) in accordance with one embodiment of the present invention. According to the present embodiment, ASCON manufacturing apparatus is, as shown in Fig. 2, comprises the asphalt reservoir (110), the feeder part of the pavement materials (120), the weighing part (130), the mixing part (140), the circulation line of hot oil medium (150), the heating part (160), the circulation pump (170) and the heat exchange part (180). Herein, since the asphalt reservoir (110), the feeder part of the pavement materials (120), the weighing part (130), the mixing part (140), the circulation line of hot oil
medium (150), the heating part (160) and the circulating pump (170) are similar to the conventional apparatus, we do not explain repeatedly.
[25] Hereafter, according to the present embodiment, the heat exchange part (180) is explained. The heat exchange part (180), as shown in Fig. 2, is installed by connection to the part of circulation line of hot oil medium (150). Precisely, it is installed on the circulation line of hot oil medium (150), and then receives and stores heat during operation of the apparatus (100), and radiates to heat the asphalt to prevent solidification during discontinuance of the apparatus (100). At this time, as shown in Fig. 2, it is recommended to install the supplementary circulation line of hot oil medium (190) through the circulation line (150), which connects the input (151) and the output (152) of the asphalt reservoir. After ASCON manufacturing is discontinued, the circulation line is changed during pre-heat period for the sake of minimum heat loss where the hot oil medium does not pass through the weighing part (130) and the mixing part (140) but pass through the supplementary circulation line (190) of hot oil medium. Therefore, according to the present embodiment, the circulation line of hot oil medium (150) which is located at the bottom of the supplementary circulation line of hot oil medium (190) is installed the valves (153, 154), and it is recommended to close these valves (153, 154) to induce circulation of hot oil medium through the supplementary circulation line (190). In addition, the valves (191, 192) are installed at the both ends of the supplementary circulation line (190), and it is recommended to keep the hot oil medium not pass through the supplementary line (190) while the main heating process is undergoing.
[26] Meanwhile, as shown in Fig. 2, it is recommended that the heat exchange part
(180) is installed between the one end of the supplementary circulation line of the hot oil medium (190) located on the circulation line (150) and the input (152) of the asphalt reservoir (110).
[27] According to the present embodiment, since the heat exchange part (180) has to prevent phase transfer of the asphalt becoming solid, it is recommended to maintain temperature of the asphalt at 85-100 0 C.
[28] Also, Figs. 3 and 4 are general views that explain the heat exchange part (180).
First, the heat exchange part (180) according to the present embodiment, as shown in Fig. 3, comprises the regenerative band (181), the pipe line of hot oil medium (182) and the external container (180). Herein, the regenerative band (181) is a composition factor where the latent-regenerative material is filled. The latent-regenerative material that is filled in the regenerative band (181) is supposed to receive heat from the high temperature oil medium where it circulates during operation of ASCON manufacturing apparatus, and it radiates to heat the oil medium during discontinuance of the apparatus.
[29] The latent-regenerative material used in the present embodiment regenerates accompanied by phase transfer at 100-11O 0 C, and it is recommended that the material should radiate desired temperature of heat during phase transfer. This latent-regenerative material is a slurry material formed by mixing an oxide and water in the 1 : 1 ratio. Herein, the oxide described above is composed of silicon dioxide 74-84 volume %, aluminum oxide 7.6-15.6 volume %, calcium oxide 1.0-2.2 %, magnesium oxide 1.0-2.2 volume %, potassium oxide 1.0-2.2 volume %, sodium oxide 3.4-4.6 volume % and iron oxide 0.6-1.8 volume %, but it is recommended that sum of the each oxides is 100 volume %. Phase transfer temperature of the latent-regenerative material is 103 0 C and the capacity of regeneration is 253 kcal/kg and it has the distinctive property that radiates certain temperature of energy consistently.
[30] Next, the pipe line of hot oil medium (182) is installed passing through inside of the regenerative band (181), and it allows the hot oil medium circulating inside of the regenerative band (181). The reason that the hot oil medium is allowed to circulate is to expand the surface area and to maximize heat transfer to store or radiate in the heat radiation process from high temperature of the hot oil medium to the latent-regenerative material. Therefore, as shown in Fig. 4 according to the present embodiment, it is recommended that the multiple pipe line of the hot oil medium (182) is aligned in a radial shape at inside of the regenerative band (181). Undoubtedly, one end of the present pipe line of hot oil medium (182) is connected to the input (184) of hot oil medium and the other end is connected to the output of the hot oil medium (185).
[31] Next, the external container (183) is installed to wrap the regenerative band (181) as described above, and isolates from the outside. It is designed with an insulation material to isolate the regenerative band (181) from the outside so that it does not release energy to the outside but only allow heating the hot oil medium.
[32] Next, the heat exchange part (180), according to the present embodiment, is installed to wrap the regenerative band (181) located at between the regenerative band (181) and the external container (183), and it is recommended that the additional hot oil medium layer (186) is installed inside where the hot oil medium traveling the pipe line of hot oild medium (182) is filled. This layer (186), as shown in Figs. 3 and 4, is installed to wrap the regenerative band (181) completely, and the hot oil medium traveling the pipe line of hot oild medium (182) is filled inside. Since the hot oil medium layer (186) is installed to cover the regenerative band (181), it stores heat in the regenerative band in maximum and radiates for the sake of heating of the hot oil medium.
[33] In addition, according to the present embodiment, the heat exchange part (180), as shown in Fig. 3, is installed on the top of the external container (183) and in the case
that it is connected to the pipe line of hot oild medium (182), and the volume of the hot oil medium in the circulation line is increased, and it is recommended to install the supplementary reservoir (187) to keep the incoming hot oil medium. During heating period of the hot oil medium by the heat exchange part (180), volume of the oil can increase drastically along with increase of the oil temperature. Therefore, the supplementary reservoir (187) is connected to the pipe line of the hot oil medium (182) and it can take increased volume portion. In addition, in the supplementary reservoir (187), it is recommended to install the input hole (188) of the hot oil medium to inject the hot oil medium. In the case of shortage of the hot oil medium, the oil medium is filled again through the input hole (188) to get heat transfer smoothly.
[34] In addition, the heat exchange part (180), according to the present embodiment, is installed at inside of the external container (183) and it is recommended that the supplementary heat source (189) which heats the hot oil medium and the latent-regenerative material is further installed. This supplementary heat source (189) is the preparatory heat source to be operated when the heat from the latent-regenerative material cannot keep temperature of the asphalt. Therefore, according to the present embodiment, it is recommended that the supplementary heat source (189) is controlled to operate when it is decreased below the fixed temperature preliminarily. Therefore, the temperature sensors are further provided to detect temperature of the hot oil medium and the latent-regenerative material (184a, 185a, 181a) precisely. In these sensors shown in Fig. 3, it is recommended to install the sensors at the input (184) where the hot oil medium inflows to the heat exchange part (180), the output (185) where the hot oil medium outflows and the regenerative band (181) which fills the latent-regenerative material. In addition, according to the present embodiment, the electric heater, which shows high heat efficiency, is used as the supplementary heat source (189). And it is recommended that the fixed temperature in which the supplementary heat source (189) is programmed to operate is set up at 5 0 C higher than phase transfer temperature of the asphalt.
[35] In addition, according to the present embodiment, ASCON manufacturing apparatus (100) is installed at the hot oil medium layer and it is recommended that the measuring part (not shown) is installed to measure the level of the hot oil medium, which fills the hot oil medium layer. The measuring part has a role that it measures the amount of the hot oil medium in the heat exchange part and supplies if necessary.
[36] <Preferred Embodiment 2>
[37] According to another embodiment of the present invention, as shown in Fig. 5,
ASCON manufacturing apparatus (200) comprises the asphalt reservoir (210), the feeder part of the pavement material (220), the weighing part (230), the mixing part (240), the circulation line of the hot oil medium (250) and the heating part (260). Since
the asphalt reservoir (210), the feeder part of the pavement material (220), the weighing part (230), the mixing part (240), the circulation line of the hot oil medium (250) and the circulation pump (270) show the identical constitution and function described in the preferred embodiment 1, we do not explain repeatedly.
[38] However, since the heating part (260) is different from the preferred embodiment
1, we explain herein. The heating part (260) is installed for the mean of heating (not shown) and transferring (not shown) of the hot oil medium which is stored inside.
[39] Herein, the mean of heating is generally an electric heater to heat the hot oil medium of ASCON manufacturing apparatus. In addition, the mean of heat exchange has a role that it stores heat when ASCON manufacturing apparatus is operating, and it radiates to heat the asphalt when ASCON manufacturing apparatus is discontinued. It has a similar structure of the heat exchange part as described in the preferred embodiment 1. At this time, the heating mean is to heat the hot oil medium, and the latent-regenerative material of the heat exchange mean stores heat generated, then radiates heat when the electric heater is not operating. Industrial Applicability
[40] According to the present invention, when ASCON manufacturing apparatus is not operating, lots of energy can be saved to heat the solid asphalt, the time waste for reheating the asphalt can be drastically reduced to manufacture ASCON so that it can match flexibly for demand of ASCON and also it has an advantage to improve manufacturing efficiency.
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