KR100890682B1 - Combustion apparatus for recovering heat using solid fuel - Google Patents

Abstract

A combustion device for collecting heat using the solid fuel is provided to minimize the heat loss and improve the air contact of the combustion gas. A combustion device for collecting heat using the solid fuel(A) comprises: a supply device part supplying the solid fuel; a first and second air feed ports(220,230) burning the solid fuel supplied by the supply device part; a first combustion chamber including a cooling layer formed in the wall; a second combustion chamber directing the combustion gas to the central part and collecting the heat through an outlet; and an ash discharging part(400) ejecting the ash from the first combustion chamber. The first air feed port burns the solid fuel with the combustion air supplied from the lower part. The second air feed port directs the combustion gas to the central part.

Description

Combustion apparatus for recovering heat using solid fuel

The present invention relates to a heat recovery combustion device using a solid fuel, and more particularly, a heat recovery combustion using a solid fuel to maximize the combustion efficiency and heat recovery of the combustion device for supplying heat energy by burning solid fuel. Relates to a device.

In general, in industrial facilities that require industrial hot water, steam, or hot gas, a combustion device is used to generate thermal energy by igniting and burning fuel in a combustion cylinder to obtain thermal energy. As a result, solid fuels, such as refuel-derived fuel (RDF) fueling household waste or refractory plastic fuel (RPF) fueled waste plastic, are burned in a combustion device to supply heat sources required for various industrial facilities.

Such solid fuels are not only inexpensive due to high calorific value and waste being reproduced as fuel, but also economical benefits from the recycling of waste resources, with no corrosion of the combustion apparatus due to the gas generated from the fuel during combustion, and separate from storage facilities. It is widely used as a heat source supply means in various industrial fields because it has various advantages such as no need of safety equipment.

However, in the conventional combustion apparatus, a large amount of solid fuel is injected into the lower part of the combustion cylinder, and the fuel is not completely burned in the process of burning, resulting in waste of materials and a problem of low thermal efficiency, and the combustion gas of the combustion apparatus heats the wall surface. Not only was there a lot of heat loss to lose heat to the outside, but the wall of the combustion device had to be provided with insulation such as refractory bricks, which caused a lot of manufacturing cost and occupied a lot of installation space.

The present invention is to solve the problems of the prior art, while completely burning the solid fuel in the combustion device and the combustion gas generated in the combustion chamber is discharged in the form of being integrated into the central portion of the combustion chamber without heating the wall surface to recover the heat It is to provide a heat recovery combustion device using a solid fuel by maximizing the heat recovery while minimizing the heat loss in one configuration.

Combustion apparatus for heat recovery using the solid fuel of the present invention includes a supply device for supplying a solid fuel; The solid fuel supplied through the supply unit is combusted by the first air supply unit and the second air supply unit, wherein the first air supply unit is supplied with combustion air from the bottom to combust the solid fuel, and the second air supply unit is supplied from the side. A first combustion chamber configured to integrate the combustion gas into the center and to form a cooling layer on the wall of the combustion chamber; A second combustion chamber provided above the first combustion chamber and configured to re-burn the combustion gas by the third air supply unit and to integrate the combustion gas into the central portion to perform heat recovery through the discharge port; And a combustion material discharge part for discharging the combustion material combusted in the first combustion chamber.

In the heat recovery combustion apparatus using solid fuel according to the present invention, the solid fuel is combusted by the air injection by the air injection nozzle of the first air supply unit provided in the lower part of the first combustion chamber, and the upper direction of the solid fuel is lowered. It is supplied in the form of whirling to convert solid fuel into completely burned ash.

In addition, by means of the second air supply portion formed inside the wall circumference of the first combustion chamber, the combustion gas is pivoted without hitting the wall surface to form an arc in the center, thereby greatly improving the air contact of the combustion gas, thereby increasing the temperature of the combustion gas. In addition, the combustion gas is concentrated in the center to prevent heat loss and prevents heat from passing through the combustion gas while the wall is not heated by forming a cooling layer by the air swirling along the wall. Therefore, it is possible to use even without a heat insulating material on the outside of the wall surface.

In addition, the air is helically sprayed by the air injector provided with a spiral vortex piece in the second combustion chamber, and the third combustion air causes the combustion gas to be pivoted and accumulated in the center part in the air ejection tubes arranged at equal intervals. By supplying the air contact efficiency to the combustion gas further by supplying, the combustion efficiency of the combustion gas is maximized by maximizing the complete combustion and temperature rise, thereby improving the thermal efficiency.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The combustion apparatus (A) for heat recovery using the solid fuel of the present invention includes: a supply device unit (100) for supplying solid fuel (F); The solid fuel F supplied through the supply device 100 is combusted by the first air supply unit 220 and the second air supply unit 230, but the first air supply unit 220 supplies combustion air from the bottom. A first combustion chamber 200 in which the solid fuel is combusted and the second air supply unit 230 is supplied from the side to integrate the combustion gas into the center, and a wall of the first combustion chamber 200 forms a cooling layer; The second combustion chamber 300 is provided on the upper side of the first combustion chamber 200 and the combustion gas is re-burned by the third air supply unit 310 and integrated into the central portion to heat recovery through the outlet 330. ; Combustion material discharge unit 400 for discharging the combustion material burned in the first combustion chamber 200; consists of.

The supply device 100 is provided with a first transfer pipe 110 and a second transfer pipe 120 provided with a transfer screw 116 for transferring the solid fuel, but one side of the first transfer pipe 110. However, the lower portion of the feed hopper 112 is installed to contain the solid fuel is to transfer the solid fuel up, the upper end of the first transfer pipe 110 is formed with a downward transfer guide tube 122 is formed horizontally The second fuel pipe 120 is capable of supplying solid fuel, and one end of the second carrier pipe 120 is installed to penetrate the side wall of the first combustion chamber 200 to supply solid fuel. It is possible to dry the solid fuel by the combustion gas flowing back partly through the transfer pipe 120 and recovers the counter-flow gas on the upper side of the first transfer pipe 110 to the first through the second air supply unit 230. Counter-current gas ash to ensure complete combustion by means of entering the combustion chamber (200) There pipe 114 is installed.

The first combustion chamber 200, a plurality of through-holes 212 is formed, the grate 210 is inclined downward to the center portion is installed in the lower portion and the vent pipe 214 in the form of venturi tube in the center is installed through the vent pipe 214 An air spray nozzle 222 of the first air supply unit 220 connected to the blower S is installed at a lower center of the lower portion of the grate 210 to allow air spray to the upper side of the first combustion chamber 200. The space portion 250 of the air by generating a negative pressure generated by the action of sucking the air on the grate 210 to completely burn the solid fuel placed on the grate 210 to accelerate the action of the combustion gas.

That is, the combustion gas is generated by the air supplied to the first combustion chamber 200 for the solid fuel mounted on the grate 210, and the air in the first combustion chamber 200 opens the through hole 212 of the grate 210. The combustion gas can be generated by the action of burning the solid fuel by the air being circulated downward to the space 250 through the supplied air.

In addition, a second air supply unit 230 in which a plurality of air supply pipes 232 are installed upright is installed inside the circumference of the wall surface 202 of the first combustion chamber 200, so that the first air preheating unit 240 in the blower (S). Air is supplied to the second air supply unit 230 through the one side of the air supply pipe 232 is the combustion gas swing injection nozzle 234 is formed in the injection direction inclined inwardly so that the combustion gas is integrated into the center portion and the other The side is formed with a cooling jet nozzle 236 to form a cooling layer by the action of the air hits the wall surface 202 so that the air is rotated along the wall surface.

The injection inclination angle 234a inclined inwardly is integrated at a 52 ° to 57 ° angle with respect to the tangent 234b so that the combustion gas turning injection nozzle 234 of the second air supply unit 230 is integrated into the center part. It is preferable to.

The combustion gas swirl injection nozzle 234 is a rectangular shape up and down the air supply pipe 232 as shown, and the combustion gas in the first combustion chamber 200 does not hit the wall surface 202 so that Air injection in the form of an arc, the cooling spray nozzle 236 to form a cooling layer between the combustion gas turning layer and the wall surface 202 as the air hits the wall surface 202, the air injection to turn the combustion gas Direction and the air injection direction forming the cooling layer are preferably pivoted in the same direction.

The second combustion chamber 300 is provided above the first combustion chamber 200, the first air preheating unit 240, and the second air preheating unit 320. The combustion gas is discharged through the outlet 330. Is discharged to recover the heat, but the air injection pipe 312 is formed to form an upward inclination angle 312a so that the combustion gas is pivoted around the upper side of the second air preheating unit 320 to be integrated into the center and upwardly discharged. A plurality of third air supply unit 310 is provided at intervals, but the spiral vortex piece 314 is provided inside the air injection pipe 312 through the second air preheating unit 320 in the blower (S) The air injected through the air injection pipe 312 is vortexed to be supplied in such a configuration that it is possible to maximize the air contact efficiency to the combustion gas.

The upward inclination angle 312a may be supplied at an angle of 52 ° to 57 ° with respect to the horizontal.

The air injection pipe 312 is disposed in two rows around the upper side of the second air preheating unit 320 so that the combustion gas accumulated in the center portion is pivoted in the form of a column in a vertical line to be discharged to the outlet 330. It is desirable to facilitate this.

The combustion material discharge unit 400, the inclined guide plate 410 is provided in the lower space 250 of the grate 210 and the transport screw 420 is provided below the inclined guide plate 410 is carried out to the outside To be done.

According to the present invention, the solid fuel supplied through the feed hopper 112 passes through the first conveying pipe 110 and the second conveying pipe body 120 and is formed on the upper side of the grate 210 through the side wall of the first combustion chamber 200. Combustion is performed by continuously inputting to the combustion chamber, and some combustion gas generated in the combustion process is flowed back to the second transfer pipe 120 to heat and dry the solid fuel to facilitate combustion. Of course, the complete combustion is made by means for allowing the first combustion chamber 200 to be recovered through the second air supply unit 230 through the reverse flow gas recovery tube 114 installed on the upper side of the first transfer pipe 110. .

As described above, the solid fuel introduced into the first combustion chamber 200 generates the combustion gas (heat source) required for various industrial sites, and uses the burner (not shown in the drawing) provided on one side to produce the solid fuel. Of course, it will ignite and burn.

At this time, in the first combustion chamber 200, the air is blown by the air injection nozzle 222 of the first air supply unit 220 installed at the lower part of the vent pipe 214 in the form of a venturi tube formed at the center of the grate 210. Air injection in the upper direction of the 200 is made to generate a combustion gas by the action of burning the solid fuel, grate 210 by the pressure difference generated in the process of air injection into the vent pipe 214 of the venturi tube type. The lower space portion 250 located in the circumference has a function of injecting air from the upper circumference of the grate 210 into the space portion 250 while injecting air into the first combustion chamber 200 through the vent pipe 214 in the center. By the complete combustion of the solid fuel placed on top of the grate 210 to accelerate combustion gas to induce complete combustion.

That is, the air supply for generating the combustion gas to the solid fuel placed on the grate 210 is not only supplied to the upper side of the solid fuel, but also is supplied in a form that circulates from the top of the solid fuel to the downward direction to completely fill the solid fuel. Change to burned ash.

The combustion material generated by burning the solid fuel is dropped into the lower space 250 through the through hole 212 of the grate 210 to the outside through the combustion material discharge unit 400 provided with a conveying screw 420. Export is made.

On the other hand, the combustion air is supplied from the lower part of the first combustion chamber 200 and the secondary combustion air is supplied by the second air supply unit 230 which is provided with a plurality of air supply pipes 232 erected around the wall surface 202. To be, by the combustion gas swing injection nozzle 234 formed on one side of the air supply pipe 232 is to turn the combustion gas to the central portion as it is pivoted to be sent to the upper side, which is a rectangular up and down of the air supply pipe 232 By means of the combustion gas turning injection nozzle 234, the combustion gas is swiveled in the first combustion chamber 200 without hitting the wall surface 202 to form an arc in the center, thereby greatly improving the air contact of the combustion gas. Since the temperature of the combustion gas is increased and the combustion gas is integrated at the center, heat loss is prevented by heating the wall 202 as in the prior art.

In addition, the wall surface 202 is heated by forming a cooling layer by air colliding with the wall surface 202 by the cooling spray nozzle 236 formed on the other side of the air supply pipe 232 so that the air is turned along the wall surface. While preventing the heat transfer of the combustion gas to be prevented so that it is possible to use even without a heat insulating material on the outside of the wall surface 202.

Subsequently, the combustion gas is raised and discharged through the second combustion chamber 300 to the outlet 330 to recover the heat. In this case, the second combustion chamber 300 has a plurality of equal intervals around the upper side of the second air preheating unit 320. Rotation of the combustion gas is made more active by supplying the third combustion air supplied through the air injection pipe 312 of the arranged third air supply unit 310 to discharge the combustion gas in a completely burned state such as a boiler and the like. It is supplied to the heat exchanger heat source.

That is, the spiral vortex piece 314 provided in the air injection pipe 312 when the air injection is made in a plurality of air injection pipe 312 arranged at equal intervals around the upper side of the second air preheating unit 320 Air is helically sprayed by the air and the combustion gas is swiveled in the air injection pipes 312 arranged at equal intervals, thereby supplying the air contact efficiency to the combustion gas by tertiary combustion air supply. It maximizes the heat efficiency by maximizing the complete combustion and temperature rise of the combustion gas to maximize the heat recovery.

The first and second air preheating units 240 and 320 formed in a partitioned form between the first and second combustion chambers 200 and 300 allow the combustion air to be heated, thereby increasing the thermal efficiency for heating the combustion gas. do.

As described above, combustion air combusting the solid fuel of the present invention is combusted by the first air supply unit 220 supplied from the lower portion of the first combustion chamber 200 and the second air supply unit 230 supplied from the side wall. Combustion air is supplied and combusted by the third air supply unit 310 of the combustion chamber 300, and combustion gas is turned and discharged in the form of a column vertically, and the wall surface of the combustion chamber is not heated, but the air contacts the combustion gas. Maximizes the heat recovery with high combustion efficiency and minimum heat loss.

In the above, the present invention has been described with reference to the above embodiments, but various modifications are possible within the technical scope of the present invention.

1 is a perspective view showing the configuration of a combustion apparatus according to the present invention.

Figure 2 is a schematic diagram showing the overall configuration of a combustion apparatus according to the present invention.

Figure 3 is a side configuration view of the combustion apparatus according to the present invention.

Figure 4 is a longitudinal cross-sectional view showing the configuration of the present invention.

5 is an exemplary cross sectional view of a first combustion chamber according to the present invention;

Figure 6 is an exemplary cross-sectional view of the second combustion chamber according to the present invention.

Figure 7 is a longitudinal cross-sectional view showing an operating state of the present invention.

FIG. 8A is an enlarged cross-sectional view of a portion of FIG. 7.

FIG. 8B is an enlarged cross-sectional view of a portion “B” of FIG. 7.

* Explanation of symbols for main parts of the drawings

A: Combustion device F: Solid fuel

S: Blower 100: Supply unit

110: first transport pipe 112: supply hopper

114: countercurrent gas recovery pipe 120: second transfer pipe

122: transfer guide 200: the first combustion chamber

202: wall 210: grate

212 through-hole 214: through-air

220: first air supply unit 222: air spray nozzle

230: second air supply unit 232: air supply pipe

234: combustion gas swirl jet nozzle 236: cooling jet nozzle

240: first air preheater 250: space

300: second combustion chamber 310: third air supply

312: air injection pipe 314: vortex flow

320: second air preheating unit 330: outlet

400: combustion material discharge portion 410: inclined guide plate

420: return screw

Claims (8)

The first transport pipe 110 and the second transport pipe 120 is provided with a transfer screw 116 for transporting the solid fuel, the solid fuel contained in the supply hopper 112, the first transport pipe 110 By the upward transfer, the upper end of the first transfer pipe 110 is formed through the side wall of the first combustion chamber 200 via the second transfer pipe 120 is horizontally formed with a lower transfer guide pipe 122 is formed A fuel supply unit 100 configured to supply fuel and supplying solid fuel having a configuration in which a backflow gas recovery pipe 114 is installed at an upper side of the first transport pipe 110; The solid fuel supplied through the supply device unit 100 is combusted by the first air supply unit 220 and the second air supply unit 230, but the first air supply unit 220 is supplied with combustion air from the bottom of the solid fuel. Combustion chamber, the second air supply unit 230 is supplied from the side to integrate the combustion gas into the center, and the first combustion chamber 200 has a wall in which the cooling layer is formed; The second combustion chamber 300 is provided on the upper side of the first combustion chamber 200 and the combustion gas is re-burned by the third air supply unit 310 and integrated into the central portion to heat recovery through the outlet 330. ; Combustion material discharge unit for discharging the combustion material burned in the first combustion chamber (200); heat recovery using a solid fuel, characterized in that consisting of. delete The method of claim 1, The first combustion chamber 200, A plurality of through-holes 212 are formed, and the grate 210 inclined downward to the center part is installed at the bottom, and a vent pipe 214 in the form of a venturi tube is installed at the center, and a blower S at the lower center of the vent pipe 214. The air injection nozzle 222 of the connected first air supply unit 220 is installed, The second air supply unit 230 in which a plurality of air supply pipes 232 are installed upright is installed around the wall surface 202, and one side of the air supply pipe 232 is inclined inwardly so that the combustion gas is pivoted and integrated into the center part. The combustion gas turning jet nozzle 234 is formed and the other side is a solid solid, characterized in that the cooling jet nozzle 236 is formed to form a cooling layer by the action of the air hit the wall surface 202 along the wall surface Combustion apparatus for heat recovery using fuel. The method of claim 3, wherein The combustion inclination injection nozzle 234 of the second air supply unit 230 has an injection inclination angle 243a in the inclined injection direction so as to be integrated into the center portion at an angle of 52 ° to 57 ° based on the tangent 243b. Combustion apparatus for heat recovery using solid fuel, characterized in that the injection. The method of claim 1, The second combustion chamber 300, Air injection pipe in the form of an upward inclination angle 312a which allows the combustion gas to pivot around the upper side of the second air preheating unit 320 provided above the first combustion chamber 200 to be integrated into the central portion and discharged upward. The third air supply unit 310 is provided with a plurality of 312 at equal intervals and a spiral vortex piece 314 is provided inside the air injection pipe 312 so that the air can be supplied vortex Heat recovery combustion apparatus using the solid fuel characterized in that. The method of claim 5, The upward inclination angle (312a), the heat recovery combustion apparatus using a solid fuel, characterized in that to be supplied at an angle of 52 ° ~ 57 ° relative to the horizontal. The method of claim 5, The air injection pipe 312, The second air preheating unit 320 is arranged in two rows around the upper portion of the heat recovery using the solid fuel, characterized in that it further comprises the combustion gas accumulated in the center portion is turned and discharged in the form of a column in a vertical line Combustion device. The method of claim 1, Between the first combustion chamber 200 and the second combustion chamber 300, the first air preheating unit 240 of the second air supply unit 230 and the second air preheating unit 320 of the third air supply unit 310 are installed. Heat recovery combustion apparatus using solid fuel, characterized in that the configuration.

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