Technical Field The present invention relates, in general, to combustors of burners and, more particularly, to a combustion activation device of burner, which has a supersaturated steam supply unit provided in the combustion chamber of a burner, thus decomposing water into hydrogen and oxygen and burning them, thereby highly improving the combustion efficiency of the burner.

Background Art Generally, boilers or incinerators are provided with burners through which fuel is ejected and, at the same time, to which air is supplied, thus burning the fuel to generate combustion heat. Burners are instruments for combustion of gas or liquid fuel, in which fuel and air are mixed together at an appropriate mixing ratio to provide mixed fuel, and the mixed fuel is ejected from a nozzle while being ignited, thus being burnt. Conventional burners have been classified into gas burners, oil burners, etc. The combustion efficiency of the conventional burners is determined by the relationship between the load imposed on a burner and the fuel ejection pressure, and the combustion efficiency of the burner determines the operational performance of a boiler or an incinerator equipped with the burner. Furthermore, the nozzle of a burner is configured such that gas or liquid fuel is ejected through fine holes formed at the end of the nozzle. The operational efficiency of the nozzle is determined by both the velocity energy and the pressure energy of the fuel ejected through the nozzle. However, in the conventional burners, an improvement in combustion efficiency can be achieved only by controlling the mixing ratio of fuel and air or by controlling the flow rate of the mixed fuel. Thus, improvements in the combustion efficiency of conventional burners are limited. Accordingly, the present invention has been made keeping in mind the above- mentioned problems occurring in the prior art in which improvements in the combustion efficiency of burners are limited, and an object of the present invention is to provide a combustion activation device of burner, which has a supersaturated steam supply unit provided in the combustion chamber of a burner, thus decomposing water into hydrogen and oxygen and burning them by the flame of the burner, thereby highly improving the combustion efficiency of the burner.

Brief Description of the Drawings Fig. 1 is a view illustrating the construction of a combustion activation device of burner, according to the present invention; Fig. 2 is a sectional view illustrating the construction of a supersaturated steam supply unit included in the combustion activation device, according to the present invention; and Fig. 3 is a view illustrating the construction of a combustion activation device of burner provided with a position adjustment unit, according to another embodiment of the present invention. -Description of the elements in the drawings- 10: burner 20: supersaturated steam supply unit 21 : flame passage 22: steam spraying holes 23 : water supply pipe 24: check valve 25: preheating pipe 26: vertical guide rail 27: rotary member 28 : coiled guide 28a: lifting arm 29: adjustment knob 37: screw shaft * 38: lifting block Disclosure of Invention Description of the Invention In order to accomplish the above object, the present invention provides a combustion activation device of burner, comprising: a supersaturated steam supply unit comprising a hollow body placed in a combustion chamber of a burner, with a flexible water supply pipe connected to a predetermined position of the hollow body, a flame passage defined at a central portion of the hollow body to allow a flame generated from a nozzle of the burner to pass through, and a plurality of steam spraying holes formed on the hollow body to be directed toward the flame passage; a guide unit placed to guide movement of the supersaturated steam supply unit in a direction away from or toward the nozzle of the burner; and a position adjustment unit for adjusting a position of the supersaturated steam supply unit in the combustion chamber according to a temperature in the combustion chamber. Herein below, the present invention will be described in detail with reference to the accompanying drawings.

Best Mode Fig. 1 is a view illustrating the construction of a combustion activation device of burner, according to the present invention. Fig. 2 is a sectional view illustrating the construction of a supersaturated steam supply unit included in the combustion activation device, according to the present invention. As shown in the drawings, the combustion activation device of the present invention comprises a supersaturated steam supply unit 20 which is provided above a burner 10 in a combustion chamber such that the flame from the burner 10 passes through the steam supply unit 20. The supersaturated steam supply unit 20 comprises a hollow pipe body having a ring shape, with a flame passage 21 defined at a central portion of the ring-shaped pipe body, so that the flame from the burner 10 passes upwards through the flame passage 21. A plurality of steam spraying holes 22 is formed on the inner surface of the supersaturated steam supply unit 20 such that the holes 22 are directed toward the flame passage 21. Thus, steam can be sprayed from the steam spraying holes 22 toward the flame passage 21. A water supply pipe 23 is connected to the supersaturated steam supply unit 20 at a predetermined position, and supplies water to the steam supply unit 20 at a predetermined flow rate. To allow the supersaturated steam supply unit 20 to be displaced when necessary, the water supply pipe 23 is made of a flexible pipe. A check valve 24 is provided at a predetermined position on the water supply pipe 23 or at the junction of the supersaturated steam supply unit 20 and the water supply pipe 23. Thus, the check valve 24 controls the direction of water flow in the water supply pipe 23 so that the water always flows only towards the supersaturated steam supply unit 20. A preheating pipe 25 is provided around the inner surface of a sidewall of the combustion chamber above the burner 10, thus preheating the water before the water is supplied to the water supply pipe 23. The supersaturated steam supply unit 20 is movably coupled through a connection arm to a plurality of vertical guide rails 26 which are vertically placed in the combustion chamber above the burner 10. Due to the vertical guide rails 26, vertical movement of the supersaturated steam supply unit 20 is stably executed. The combustion activation device of the present invention further includes a position adjustment unit for allowing a user to adjust the position of the supersaturated steam supply unit 20 according to the temperature in the combustion chamber. The position adjustment unit comprises a rotary member 27, for example, a ring gear, which is concentrically and rotatably placed around the burner 10. Furthermore, a coiled guide 28 is mounted to the upper surface of the rotary member 27. The coiled guide 28 is shaped by spirally coiling a rod wire, and is placed such that the guide 28 surrounds the supersaturated steam supply unit 20. Furthermore, lifting arms 28a extend outwards from diametrically opposite positions of the supersaturated steam supply unit 20 in radial directions, and are movably seated on a desired spiral turn of the coiled guide 28. Thus, when the coiled guide 28 is rotated around its vertical axis, the lifting arms 28a move upwards or downwards along the spiral turns of the coiled guide 28. Therefore, the supersaturated steam supply unit 20 can be moved vertically until it is placed at a desired position above the burner 10. The rotary member 27 is coupled to an adjustment knob 29 through a power transmission unit, such as a bevel gear assembly or a worm and worm gear assembly. Thus, a user can rotate the rotary member 27 by a desired rotational angle and a desired rotational direction by manipulating the adjustment knob 29 outside the combustion chamber. Fig. 3 is a view illustrating the construction of a combustion activation device of burner provided with a position adjustment unit, according to another embodiment of the present invention. In this embodiment, the position adjustment unit for adjusting the position of the supersaturated steam supply unit 20 is altered as follows. A screw shaft 37 is vertically placed in the combustion chamber such that the screw shaft 37 is parallel to the vertical guide rails 26 which guide the vertical movement of the supersaturated steam supply unit 20. The screw shaft 37 is rotatably held by bearings at upper and lower ends thereof A lifting block 38 engages with the screw shaft 37 through a screw-type engagement so that the lifting block 38 moves upwards or downwards along the screw shaft 37 during rotation of the screw shaft 37. The lifting block 38 is connected to the supersaturated steam supply unit 20, thus moving the supersaturated steam supply unit 20 upward or downward in the combustion chamber during the rotation of the screw shaft 37. In a similar manner to that described for the first embodiment, the screw shaft 37 is coupled to an adjustment knob 29 through a power transmission unit, such as a bevel gear assembly or a spur gear assembly. Thus, a user can rotate the screw shaft 37 by a desired rotational angle and a desired rotational direction by manipulating the adjustment knob 29 outside the combustion chamber. The combustion activation device of the present invention having the above-mentioned construction will be operated as follows. When water is supplied to the water supply pipe 23, the water passes through the check valve 24 and flows into the supersaturated steam supply unit 20. In the above state, the burner 10 is ignited to generate flame. The temperatures in the combustion chamber vary according to the parts of the flame of the burner 10. Thus, the position of the supersaturated steam supply unit 20 must be adjusted by manipulating the adjustment knob 29 so that the unit 20 is placed in a space around the hottest part of the flame. When the adjustment knob 29 is rotated to adjust the position of the supersaturated steam supply unit 20, the rotational force of the knob 29 is transmitted to the rotary member 27 through the power transmission unit, thus rotating the rotary member 27. Due to the rotation of the rotary member 27, the coiled guide 28 is rotated so that the lifting arms 28a move upwards or downwards along the spiral turns of the coiled guide 28. Therefore, the position of the supersaturated steam supply unit 20 is adjusted. When the adjustment knob 29 of the embodiment of Fig. 3 is rotated to adjust the position of the supersaturated steam supply unit 20, the rotational force of the knob 29 is transmitted to the screw shaft 37 through the power transmission unit, thus rotating the screw shaft 37. Therefore, the lifting block 38 moves upwards or downwards along the screw shaft 37 so that the position of the supersaturated steam supply unit 20 is adjusted. When the supersaturated steam supply unit 20 is placed in the space around the hottest part of the flame of the burner 10, the unit 20 is highly heated by the flame so that the water in the unit 20 is quickly boiled, thus being vaporized. The steam in the above state is heated up to about 400 ~ 600°C, thus becoming supersaturated steam having unstable molecular motion. The hot supersaturated steam is sprayed from the steam spraying holes 22 of the unit 20 to the flame passage 21. The supersaturated steam sprayed from the steam supply unit 20 is decomposed into hydrogen and oxygen and is burnt by the flame of the burner 10, so that the combustion efficiency and operational performance of the burner 10 are highly improved. When the preheating pipe 25 is provided around the inner surface of the sidewall of the combustion chamber above the burner 10, water flowing in the pipe 25 is preheated by the combustion heat and is supplied to the supersaturated steam supply unit 20 through the water supply pipe 23. Thus, it is possible to generate supersaturated steam from the steam supply unit 20 more quickly. When supersaturated steam is sprayed from the steam spraying holes 22 of the steam supply unit 20, the pressure in the unit 20 is instantaneously reduced so that water in the water supply pipe 23 is quickly introduced into the unit 20. The above-mentioned process is continuously repeated during the operation of the combustion activation device, so that the supersaturated steam is continuously generated. Furthermore, although the pressure in the steam supply unit 20 is increased due to the supersaturated steam generated in the unit 20, the check valve 24 prevents water in the water supply pipe 23 from flowing backwards. To extinguish the flame of the burner 10, the adjustment knob 29 is manipulated such that the steam supply unit 20 is moved downwards until the unit 20 is placed around the lower part of the flame of the burner 10, the temperature of which is lower than the other parts of the flame. Thus, steam that is not supersaturated is sprayed from the unit 20 onto the flame, quickly extinguishing the flame of the burner 10. As described above, the present invention provides a combustion activation device of burner, which has a supersaturated steam supply unit to heat water and generate supersaturated steam at a position around the hottest part of the flame of a burner, and spray the supersaturated steam onto the flame. The supersaturated steam is thus decomposed into hydrogen and oxygen that are burnt by the flame of the burner, so that the combustion efficiency of the burner is highly improved. Furthermore, to extinguish the flame of the burner, the supersaturated steam supply unit is moved downwards to a position around the lower part of the flame, thus quickly extinguishing the flame of the burner.