JP2013079733A - Combustion furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion furnace that stably burns a relatively large amount of fuel, such as wooden chips or wooden pellets.SOLUTION: The combustion furnace 1 includes: a cylindrical combustion chamber 2; a water jacket 3 formed to surround the outside of the combustion chamber 2; and a cylindrical ring-shaped upper air chamber 4 arranged on the outer circumferential side of the water jacket 3. On the combustion chamber wall 21 and an upper casing 31, air supply tubes 71, 72, 73 for guiding the combustion air in the upper air chamber 4 to the combustion chamber 2 are fixed therethrough. In the bottom surface of the combustion chamber 2, a plurality of through holes 61, 61, ... blowing the combustion air, and a disk-like bottom plate 6 having a receiving part 62 of fuel F are arranged. The air supply tubes 71, 72, 73 blow a clockwise swirling flow, a downflow and a counterclockwise swirling flow of the combustion air to form a turbulence flow.

Description

  The present invention relates to a combustion furnace for burning wood chips and wood pellets.

  2. Description of the Related Art Conventionally, as a combustion furnace that burns wood chips and wood pellets and supplies heat to a boiler or the like, there is one configured to form a swirling flow of combustion air in a cylindrical combustion chamber.

  As shown in FIG. 11, this type of combustion furnace includes an air chamber between a cylindrical inner wall 221 that forms a cylindrical combustion chamber 202 therein and an inner wall 221 that is disposed on the outer peripheral side of the inner wall 221. There are an outer wall 241 that forms 204 and a plurality of air passages 207 that are formed in the circumferential direction on the inner wall 221 and supply combustion air from the air chamber 204 to the combustion chamber 202 (see Patent Document 1). .

  FIG. 12 is a cross-sectional view in the direction perpendicular to the axis of the combustion chamber 202 at a position where the air passage 207 of the combustion furnace 201 is formed. As shown in FIG. 12, the air chamber 204 for supplying combustion air to the air passage 207 has a cylindrical annular shape, and combustion air is supplied from an air supply pipe 241a extending in the tangential direction of the outer wall 241 of the air chamber 204, as indicated by an arrow F11. As shown, the combustion air flows uniformly in the air chamber 204. The combustion air in the air chamber 204 is blown out to the combustion chamber 202 through the air passage 207.

  13 is an enlarged cross-sectional view showing a portion in the vicinity of the air passage 207 in a cross section perpendicular to the axis of the combustion chamber 202, and FIG. 14 is a projection of the air passage 207 on a radial cross section including the axis of the combustion chamber 202. It is an expanded vertical sectional view which shows a mode. As shown in FIGS. 13 and 14, the air passage 207 formed in the inner wall 221 is formed to be inclined in the horizontal plane and the vertical plane with respect to the radial direction of the combustion chamber 202. As a result, the combustion air in the air chamber 204 is blown out in a direction decentered with respect to the central axis of the combustion chamber 202 and toward the top surface side of the combustion chamber 202 as indicated by an arrow F12. An upward swirling flow of combustion air is formed in 202.

  Further, a screw conveyor 209 extending in the axial direction of the combustion chamber 202 is disposed at the center of the bottom surface of the combustion chamber 202, and a fuel to be rotationally driven is provided at the fuel supply port 291 at the tip of the screw conveyor 209. A diffusion rod 293 is provided. Fuel 210 guided by a screw conveyor 209 from a fuel hopper (not shown) is discharged from a fuel supply port 291 of the screw conveyor 209 and dispersed on the bottom surface of the combustion chamber 202 by a rotating fuel diffusion rod 293.

  In this way, fuel that is formed of a wood chip or the like that is less likely to burn than fossil fuel by forming an upward swirling flow of combustion air in the combustion chamber 202 and supplying the fuel 210 to the center of the bottom surface of the combustion chamber 202. 210 is made to burn stably.

JP 2007-341409 A

  However, in the conventional combustion furnace 201, when the amount of fuel supplied is relatively large, if the flow rate of the combustion air is increased so as to achieve a predetermined air fuel consumption, the residence time of the combustion air in the combustion chamber 202 is reduced. Inconveniently, the unburned components of the fuel are discharged before completing the combustion. In order to prevent such inconvenience, if the flow rate of the combustion air is decreased, the amount of air relative to the fuel is insufficient, and incomplete combustion may occur.

  Therefore, an object of the present invention is to provide a combustion furnace capable of stably burning a relatively large amount of fuel such as wood chips and wood pellets.

In order to solve the above problems, the combustion furnace of the present invention is a combustion furnace for burning plant-based regenerated fuel,
A cylindrical combustion chamber;
A fuel supply section for supplying fuel into the combustion chamber;
And a plurality of side air passages that are provided on a side surface of the combustion chamber and blow out combustion air in different directions with respect to the radial direction of the combustion chamber.

  According to the above configuration, the combustion air is blown out in directions different from each other with respect to the radial direction of the combustion chamber by the plurality of side air passages, and a turbulent flow of the combustion air is formed in the combustion chamber. As a result, the fuel can be completely burned stably, rather than a swirling flow is formed in the combustion chamber.

  Here, examples of the plant-based regenerated fuel include those obtained by crushing plant-based materials such as wood chips and those obtained by molding plant-based materials such as wood pellets. Plant-based materials include wood-based materials such as sawdust, wood chips, thinning and pruning materials, agricultural materials such as rice straw, rice husks, weeds and bagasse, waste-based materials such as construction waste, and waste paper And paper-based materials such as waste pulp. Further, the plant-based regenerated fuel may be a fuel partially using a plant-based material, such as RPF (Refuse Paper and Plastic Fuel).

  In the combustion furnace of one embodiment, the side air passage includes a first air passage inclined to one side in the radial direction within the axis perpendicular to the combustion chamber, and a radial direction within the axis perpendicular to the combustion chamber. A second air passage inclined to the other side, a third air passage inclined to the bottom surface side of the combustion chamber within the shaft inclusion surface of the combustion chamber, and a top surface side of the combustion chamber within the shaft inclusion surface of the combustion chamber. Including at least two of the inclined fourth air passages.

  According to the above-described embodiment, the first air passage inclined to one side in the radial direction within the plane perpendicular to the axis of the combustion chamber, and the second air passage inclined to the other side in the radial direction within the plane perpendicular to the axis of the combustion chamber; At least two of a third air passage inclined toward the bottom surface side of the combustion chamber within the shaft inclusion surface of the combustion chamber and a fourth air passage inclined toward the top surface side of the combustion chamber within the shaft inclusion surface of the combustion chamber. As a result, the turbulent flow is effectively formed in the combustion chamber.

  In the combustion furnace of one embodiment, the side air passage is formed by a plurality of air supply pipes that are disposed through a wall that defines the combustion chamber.

  According to the said embodiment, the side part air channel which blows off combustion air in a predetermined | prescribed direction can be easily installed by arrange | positioning an air supply pipe through the wall which divides a combustion chamber.

  A combustion furnace according to an embodiment includes an air chamber that is provided on an outer peripheral side of the combustion chamber and communicates with the side air passage and is supplied with combustion air blown out to the combustion chamber through the side air passage.

  According to the above embodiment, the combustion air is supplied to the air chamber provided on the outer peripheral side of the combustion chamber, and the combustion air supplied to the air chamber is blown out to the combustion chamber through the side air passage. Thereby, combustion air with a uniform flow velocity and flow rate can be blown out from the plurality of side air passages into the combustion chamber. Further, since the combustion air before being blown out to the combustion chamber can be heated in the air chamber by the heat transmitted from the combustion chamber, it is possible to prevent the temperature in the combustion chamber from being lowered by the combustion air.

  In the combustion furnace of one embodiment, the air chamber has a cylindrical ring shape, and combustion air is supplied in a tangential direction of a side surface of the cylindrical ring-shaped air chamber.

  According to the above embodiment, the combustion air is supplied in the tangential direction of the side surface of the cylindrical ring-shaped air chamber, so that the flow of the combustion air in the air chamber becomes uniform. The flow velocity and flow rate of the combustion air that is blown out to the combustion chamber can be made uniform.

  In the combustion furnace of one embodiment, a plurality of the air chambers are provided corresponding to the plurality of side air passages.

  According to the embodiment, by supplying combustion air to each of the plurality of air chambers, the flow rate of the combustion air blown out from the side air passages connected to the air chambers to the combustion chambers is adjusted for each side air passage. Can do. Therefore, the turbulent flow formed in the combustion chamber can be adjusted with high accuracy.

  The combustion furnace of one embodiment is provided with a bottom air passage for blowing combustion air into the combustion chamber on the bottom surface of the combustion chamber.

  According to the above embodiment, by blowing the combustion air into the combustion chamber through the bottom air passage, the combustion air can be directly supplied to the fuel and the complete combustion of the fuel can be promoted.

  The combustion furnace of one embodiment is provided with a fuel supply port for supplying fuel into the combustion chamber on the bottom side of the combustion chamber on the bottom side of the position where the side air passage is installed.

  According to the above embodiment, the fuel supplied from the side surface of the combustion chamber through the fuel supply port and dropped to the vicinity of the bottom surface of the combustion chamber is effective due to the turbulent flow of the combustion air supplied through the plurality of side air passages. It is possible to obtain a sufficient amount of heat by burning.

  The combustion furnace of one embodiment is provided with a fuel supply port for supplying fuel into the combustion chamber on the bottom surface of the combustion chamber.

  According to the above embodiment, the fuel supplied to the vicinity of the bottom surface of the combustion chamber through the fuel supply port is effectively burned by the turbulent flow of the combustion air supplied through the plurality of side air passages, and a sufficient amount of heat is generated. Can be obtained.

It is a longitudinal section showing a combustion furnace of a 1st embodiment of the present invention. It is a top view which shows an upper air chamber and a lower air chamber. It is a perspective view which shows a bottom plate. It is a longitudinal cross-sectional view which shows arrangement | positioning of the air supply pipe which forms a side part air path. It is a plane sectional view showing arrangement of the 1st swirl flow pipe among air supply pipes. It is a plane sectional view showing arrangement of a downflow pipe among air supply pipes. It is a plane sectional view showing arrangement of the 2nd swirl flow pipe among air supply pipes. It is a longitudinal cross-sectional view which shows arrangement | positioning of another air supply pipe. It is a mimetic diagram showing a boiler device using a combustion furnace of an embodiment. It is a schematic cross section which shows a water heat exchanger. It is a longitudinal cross-sectional view which shows the combustion furnace of 2nd Embodiment. It is a longitudinal cross-sectional view which shows an air supply pipe and an upper air chamber. It is a longitudinal cross-sectional view which shows a fuel supply part. It is sectional drawing which shows the conventional combustion furnace. It is a transverse cross section in the formation position of the air passage of the conventional combustion furnace. It is an expanded cross-sectional view which shows the air passage of the conventional combustion furnace. It is an expanded vertical sectional view which shows the air passage of the conventional combustion furnace.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing a combustion furnace according to a first embodiment of the present invention. The combustion furnace 1 of the present embodiment uses wood chips, which are plant-based regenerated fuels, as fuel, and is used as a heat source for a boiler device.

  The combustion furnace 1 of the first embodiment includes a cylindrical combustion chamber 2, a substantially cylindrical ring-shaped water jacket 3 formed so as to surround the outside of the combustion chamber 2, and a height direction on the outer peripheral side of the water jacket 3. Is provided with a cylindrical ring-shaped upper air chamber 4 disposed substantially at the center. The combustion chamber 2 is surrounded by a cylindrical combustion chamber wall 21 formed using a castable refractory. The combustion chamber wall 21 may be formed using other fire-resistant materials such as refractory bricks. The water jacket 3 outside the combustion chamber 2 is formed between the combustion chamber wall 21 and the upper casing 31.

  A plurality of air supply pipes 71, 72, 73 that guide the combustion air of the upper air chamber 4 to the combustion chamber 2 are fixed to the side surfaces of the combustion chamber wall 21 and the upper casing 31 so as to penetrate therethrough. The air supply pipes 71, 72, 73 have side air passages formed therein, and are fixed to be inclined with respect to the radial direction or the axial direction of the combustion chamber 2 as will be described in detail later. The upper air chamber 4 is formed inside an air chamber wall 41 installed so as to surround the peripheral surface of the upper casing 31, and passes through an upper air supply pipe 42 connected to the air chamber wall 41, as indicated by an arrow A 5. Combustion air is supplied. The combustion air supplied to the upper air chamber 4 is supplied to the combustion chamber 2 through the air supply pipes 71, 72, 73, and burns into the region surrounded by the air supply pipes 71, 72, 73 of the combustion chamber 2. Create air turbulence. The high-temperature combustion gas generated by burning the fuel F in the combustion chamber 2 flows in a swirling manner above the region where the turbulent flow of the combustion air is formed, and the exhaust gas connected to the upper portion of the combustion chamber wall 21. It passes through the pipe 22 and is supplied to the water heat exchanger 14 described later.

  On the bottom surface of the combustion chamber 2, a disc-shaped bottom plate 6 fitted to the lower end of the combustion chamber wall 21 is disposed, and the lower air chamber 5 is disposed below the bottom plate 6. The lower air chamber 5 is formed in a cylindrical lower casing 51. In the bottom plate 6, through holes 61, 61,... As a plurality of bottom air passages for guiding combustion air from the lower air chamber 5 to the combustion chamber 2 are formed in the outer diameter portion. A receiving portion 62 for receiving the fuel F is formed on a surface of the inner surface of the bottom plate 6 facing the combustion chamber 2. Combustion air is supplied to the lower air chamber 5 through a lower air supply pipe 52 provided in the lower casing 51 as indicated by an arrow A6.

  FIG. 2 is a schematic diagram showing the shapes of the upper air chamber 4 and the lower air chamber 5 in a plan view. As shown in FIG. 2, the upper air supply pipe 42 provided on the side surface of the upper air chamber 4 extends in the tangential direction of the side surface of the air chamber 4. By supplying air in the tangential direction to the upper air chamber 4 through the upper air supply pipe 42, it is possible to form an air flow with little deviation in the circumferential direction in the upper air chamber 4 having a cylindrical ring shape. On the other hand, the lower air supply pipe 52 provided on the side surface of the lower air chamber 5 extends in the radial direction of the lower air chamber 5 in plan view. By supplying air in the radial direction to the lower air chamber 5 through the lower air supply pipe 52, an air flow with less bias is formed in the cylindrical lower air chamber 5. Combustion air is supplied to the upper air chamber 4 and the lower air supply pipe 52 by the blower 20 connected to the upstream side of the upper air supply pipe 42 and the lower air supply pipe 52.

  FIG. 3 is a perspective view showing the bottom plate 6. The bottom plate 6 is formed by casting a castable refractory into a disk shape, and a plurality of through holes 61, 61,... Are formed in an annular region of the outer diameter portion in plan view. A receiving portion 62 is provided in an inner diameter portion that is the inner side in the radial direction of the region in which the through holes 61, 61, ... are formed. The receiving portion 62 is formed of a circular shallow recess formed on the surface facing the combustion chamber 2. The receiving portion 62 receives the fuel F supplied from the screw conveyor 9 as a fuel supply portion. The receiving unit 62 holds the fuel F to be burned when the combustion furnace 1 performs a combustion operation for supplying heat to the water heat exchanger 14. On the other hand, when the combustion furnace 1 performs a standby operation in which heat is not supplied to the water heat exchanger 14, the ignited fuel F is held as a seed flame. If the receiving part 62 holds the seed fire during the standby operation, if the supply amount of the fuel F and the combustion air to the combustion chamber 2 increases, the operation can be quickly shifted to the combustion operation. The fuel F may be supported not only by the receiving portion 62 but also by a portion located on the outer diameter side of the receiving portion 62 of the bottom plate 6.

  On the side surface of the combustion chamber 2, a screw conveyor 9 is installed as a fuel supply unit that supplies the fuel F. The screw conveyor 9 is formed of a cylindrical casing 91, a rotary drive shaft 92 and a conveying screw 93 arranged in the casing 91, and one end thereof is connected to an input pipe 94 for introducing fuel F. The input pipe 94 is connected to the supply conveyor 12 of the fixed-quantity feeder 11 that stores and supplies the fuel F via the shut-off valve 13. At the other end of the screw conveyor 9, a fuel supply port 91 a that opens to the side surface of the combustion chamber 2 is provided. The center of the fuel supply port 91a in the height direction is installed at a position lower than the region where the plurality of air supply pipes 71, 72, 73 are arranged. The center in the height direction of the fuel supply port 91a may be installed at a position lower than the center in the height direction of the region where the plurality of air supply pipes 71, 72, 73 are arranged. Here, the height direction is substantially the same as the extending direction of the central axis of the combustion chamber 2, and the low side is the side close to the bottom surface of the lower casing 51, and the high side is high. The side is the side close to the top surface of the upper casing 31. The screw conveyor 9 is inclined so that its position increases as it goes from one end to the other end. This makes it difficult for hot combustion air to flow back through the screw conveyor 9.

  The water jacket 3 disposed outside the combustion chamber 2 heats the water supplied from the hot water storage tank 15, and the heating feed pipe 33 connected to the lower part of the upper casing 31 is indicated by an arrow W 1. The water from the hot water storage tank 15 is introduced. Water heated by receiving heat from the combustion chamber 2 in the water jacket 3 is discharged from the drain pipe 32 connected to the upper portion of the upper casing 31 toward the water heat exchanger 14 as indicated by an arrow W2. .

  FIG. 4A is a longitudinal sectional view showing an arrangement state of the air supply pipes 71, 72, 73 installed on the side surface of the combustion chamber 2. 4A is a cross-sectional view showing a state in which the combustion chamber wall 21 and the upper casing 31 are cut in a plane including the central axis of the combustion chamber 2 at the installation positions of the air supply pipes 71, 72, 73. In addition, in FIG. 4A, the inclination with respect to the radial direction of the air supply pipes 71 and 73 is not expressed.

  As shown in FIG. 4A, in the combustion furnace 1 of the present embodiment, three stages of air supply pipes 71, 72, 73 are arranged in the extending direction of the central axis of the combustion chamber 2. Of these air supply pipes 71, 72, 73, the first air supply pipe 71 located closest to the top surface of the combustion chamber 2 is a first swirl parallel to a plane perpendicular to the central axis of the combustion chamber 2. It is a flow tube. 4B, the first swirl flow tube is disposed at an inclination angle α in the clockwise direction with respect to the radial direction when viewed in the central axis direction of the combustion chamber 2. As shown in FIG. Thereby, the combustion air guided from the upper air chamber 4 through the first swirl flow pipe is blown into the combustion chamber 2 in the eccentric direction of the central axis.

  The second air supply pipe 72 positioned on the bottom surface side of the combustion chamber 2 with respect to the first air supply pipe 71 has a combustion chamber 2 on the side facing the combustion chamber 2 with respect to the plane perpendicular to the central axis of the combustion chamber 2. 2 is a downflow pipe inclined toward the bottom surface. As shown in the longitudinal sectional view of FIG. 4A, the downflow pipe is arranged at an inclination angle θ with respect to the direction perpendicular to the axis of the combustion chamber 2, and as shown in the plan sectional view of FIG. 4C. The combustion chamber 2 is disposed in the radial direction when viewed from the central axis direction. Thus, the combustion air guided from the upper air chamber 4 through the second air supply pipe 72 is blown out into the combustion chamber 2 in the bottom direction.

  The third air supply pipe 73 located on the bottom side of the combustion chamber 2 with respect to the second air supply pipe 72 is a second swirl flow pipe parallel to a plane perpendicular to the central axis of the combustion chamber 2. . The second swirl flow tube is disposed at an inclination angle β counterclockwise with respect to the radial direction when viewed in the central axis direction of the combustion chamber 2 as shown in the plan sectional view of FIG. 4D. The inclination angle β with respect to the radial direction of the second swirl flow tube is opposite to the inclination angle α with respect to the radial direction of the first swirl flow tube with respect to the radial direction. Thus, the combustion air guided from the upper air chamber 4 through the third air supply pipe 73 is blown into the combustion chamber 2 in an eccentric direction opposite to the first air supply pipe 71 with respect to the central axis. The

  Combustion air blown in the eccentric direction by the first air supply pipe 71, combustion air blown in the bottom direction by the second air supply pipe 72, and eccentricity by the third air supply pipe 73 The combustion air blown out collides, and a turbulent flow of the combustion air is formed in and around the region surrounded by the air supply pipes 71, 72, 73 of the combustion chamber 2. By forming a turbulent flow of combustion air in the combustion chamber 2, the fuel F can be completely burned and the generation of carbon monoxide and soot can be reduced as compared to forming only a swirl flow in the combustion chamber 2. . Therefore, it is possible to prevent the danger of carbon monoxide leaking and the disadvantage that soot accumulates in the water heat exchanger 14 and the heat exchange capacity is reduced.

  Here, the inclination angle α with respect to the radial direction of the first swirl flow pipe constituting the first air supply pipe 71 is greater than 0 ° and not more than 50 °, and preferably not less than 1 ° and not more than 30 °. The inclination angle θ of the downflow pipe constituting the second air supply pipe 72 with respect to the direction perpendicular to the axis is greater than 0 ° and 50 ° or less, and preferably 1 ° or more and 30 ° or less. In addition, the inclination angle β with respect to the radial direction of the second swirl flow pipe constituting the third air supply pipe 73 is greater than 0 ° and not more than 50 °, and preferably not less than 1 ° and not more than 30 °.

  As shown in the longitudinal sectional view of FIG. 4A, the air supply pipes 71, 72, 73 of the combustion chamber 2 have the top surface side of the combustion chamber 2 as the first swirl flow pipe and the central stage as the downflow pipe. In addition, the bottom surface side of the combustion chamber 2 is a second swirl flow pipe, and the first air supply pipe 71 on the top surface side of the combustion chamber 2 is a downflow pipe as shown in the longitudinal sectional view of FIG. The second air supply pipe 72 may be a swirl flow pipe, and the third air supply pipe 73 on the bottom side of the combustion chamber 2 may be an upflow pipe. The upflow pipe is inclined in the radial direction in the direction of the central axis of the combustion chamber 2 while the side facing the combustion chamber 2 is inclined toward the top surface of the combustion chamber 2 with respect to the plane perpendicular to the central axis of the combustion chamber 2. Is done. By the third air supply pipe 73 formed by the upflow pipe, the combustion air guided from the upper air chamber 4 is blown out into the combustion chamber 2 in the top surface direction, and the first air pipe formed by the downflow pipe is formed. Turbulence is generated by colliding with the flow of combustion air in the bottom direction blown out from the air supply pipe 71 and the flow of combustion air in the eccentric direction blown out from the second air supply pipe 72 formed by the swirl flow pipe Is done. Further, the number of installation stages of the air supply pipe can be appropriately set according to the flow to be formed in the combustion chamber 2. Further, the number of stages of the entire air supply pipe may be any number other than three.

  Further, the side air passage may be formed by providing a through-hole in a thick wall body in addition to using an air supply pipe. In this case, the extending direction of the through hole is inclined with respect to a plane perpendicular to the central axis of the combustion chamber 2 or a plane passing through the central axis, or an inclined passage or a swirl passage is formed in the radial direction. be able to.

  Drawing 6 is a mimetic diagram showing the boiler unit constituted using the combustion furnace of an embodiment. As shown in FIG. 6, the boiler apparatus 10 includes the combustion furnace 1, a water heat exchanger 14 as a heat device to which combustion gas is supplied from the combustion furnace 1, a water heat exchanger 14, and the combustion furnace 1. A hot water storage tank 15 for storing heated high-temperature water, a cyclone dust collecting device 17 for collecting dust exhausted from the water heat exchanger 14, and an induction fan 18 connected to the exhaust port of the cyclone dust collecting device 17 are provided. .

  In the combustion furnace 1, wood chips as fuel are unwound from the supply conveyor 12 of the metering feeder 11 and supplied to the screw conveyor 9 through a shut-off valve 13 for maintaining the pressure in the combustion chamber 2. In the silo portion of the fixed amount feeder 11, a stirring device 114 is provided in which a plurality of stirring rods extending in the radial direction are fixed to a rotating shaft. The stirring device 114 is rotationally driven by a driving means 115 installed on a side portion of the fixed amount feeder 11 and stirs the fuel F stored in the silo portion of the constant amount feeder 11. The silo portion of the fixed amount feeder 11 is provided with a level sensor that detects the remaining amount by detecting the surface position of the fuel F to be stored. The screw conveyor 9 is provided with a temperature sensor, and monitors whether the fuel F conveyed by the screw conveyor 9 is ignited by the high-temperature air from the combustion chamber 2 based on the temperature detected by the temperature sensor. When the temperature sensor detects the abnormal temperature and detects the ignition of the fuel F, the open / close valve of the water supply pipe connected to the screw conveyor 9 is opened to extinguish the fire.

  An exhaust pipe 22 that guides combustion gas from the combustion chamber 2 of the combustion furnace 1 is connected to the water heat exchanger 14 and communicates with the start end of the combustion gas passage of the water heat exchanger 14. The temperature of the combustion gas sent from the combustion chamber 2 to the water heat exchanger 14 is detected by a gas temperature sensor of the combustion chamber 2, and the supply amount of the combustion air and the fuel F is controlled based on the detected value of the gas temperature sensor. Is done.

  FIG. 7 is a schematic cross-sectional view showing the water heat exchanger 14 in detail. In the water heat exchanger 14, the upper part of the vertically long casing 141 is partitioned by an upper partition plate 142 that also serves as a tube plate and a partition wall 144, and a front smoke chamber 145 and a rear smoke chamber 146 are formed. Further, the lower portion in the casing 141 is partitioned by a lower partition plate 143 that also serves as a tube plate, and an intermediate smoke chamber 147 is formed. A water can 149 is formed between the upper partition plate 142 and the lower partition plate 143 of the casing 141, and a plurality of smoke tubes 148, 148,... Whose ends are welded to the upper partition plate 142 and the lower partition plate 143. .. Are arranged inside the water can 149. In this water heat exchanger 14, the combustion gas that has flowed into the front smoke chamber 145 from the combustion furnace 1 flows into the smoke pipe 148 as indicated by the arrow G, and after exchanging heat with the water in the water can 149, the intermediate smoke chamber It flows to 147. The combustion gas turns back in the intermediate smoke chamber 147, flows into the smoke pipe 148 as indicated by an arrow H, and further exchanges heat with the water in the water can 149, and then flows into the rear smoke chamber 146. The combustion gas in the rear smoke chamber 146 is exhausted through the exhaust pipe 164 as indicated by an arrow I and received by the cyclone dust collector 17 on the downstream side. Water from the water jacket 3 of the combustion furnace 1 flows into the water can 149 as shown by an arrow W2 through a water supply port 160 provided at the lower portion of the casing 141. The water whose temperature has risen due to heat exchange with the combustion gas passing through the smoke pipes 148 and 149 in the water can 149 is provided in a communication pipe 161 communicating with the upper part of the water can 149, and the upper part of the communication pipe 161. The water is discharged through the drain 162 as shown by the arrow W3. At the upper end of the communication pipe 161, an atmospheric release valve 163 is provided for releasing water vapor to the atmosphere when the water vapor in the water can 149 reaches a predetermined pressure.

  The water heat exchanger 14 further heats the water heated by the water jacket 3 of the combustion furnace 1 and supplies it to the hot water storage tank 15. The water can 149 of the water heat exchanger 14 is provided with a water level sensor that detects the amount of water inside. The drain pipe 32 of the water jacket 3 is provided with a temperature sensor that detects the temperature of water. The hot water storage tank 15 is provided with a temperature sensor for detecting the temperature of the stored water and a water level sensor for detecting the amount of water inside.

  The hot water storage tank 15 is connected to a heating return pipe 81 extending from the water heat exchanger 14 and a heating feed pipe 33 interposed in the circulation pump 16 and extending to the water jacket 3 of the combustion furnace 1. The water heat exchanger 14, the water jacket 3 and the hot water storage tank 15 constitute a circulation path. Further, the hot water storage tank 15 includes a hot water storage tank 15, a water heat exchanger 14, a water supply pipe 151 that supplies water according to the water level in the water jacket 3, and hot water as a hot water supply facility as indicated by an arrow D. As shown by the arrow E, the hot water supply pipe 152 for supplying hot water is connected to the hot water supply return pipe 153 from which the hot water returns.

  The cyclone dust collecting device 17 includes a cylindrical portion 171 provided with a combustion gas suction port on a side surface, an inverted conical separating portion 172 that forms a swirling flow inside the cylindrical portion 171, and a cylindrical portion. 171 has an exhaust cylinder 175 that protrudes upward from the inside. A rotary valve 173 is connected to the lower end of the separation part 172, and a dust container 174 is provided via the rotary valve 173. The cyclone dust collector 17 sucks the combustion gas that has been heat exchanged by the water heat exchanger 14 from the suction port of the cylindrical portion 171, and the cylindrical portion 171 and the separation portion 172 cause the combustion gas to flow as indicated by an arrow Y 1. A swirl flow is formed, and dust contained in the combustion gas is separated by the centrifugal force of the swirl flow. The dust separated from the combustion gas is discharged from the rotary valve 173 to the dust container 174, while the combustion gas from which the dust is separated is discharged from the exhaust cylinder 175 as indicated by an arrow Y2. The combustion gas discharged to the exhaust cylinder 175 is sucked into the induction fan 18 through the exhaust pipe 176 connected to the exhaust cylinder 175.

  The induction fan 18 is formed of a centrifugal blower, and a fan casing that houses an intake pipe 181 connected to an exhaust pipe 176 connected from a cyclone dust collector 17 and a rotor blade disposed concentrically with the central axis of the intake pipe 181. 182 and a drive unit 183 that drives the rotor blades in the fan casing 182. A chimney 19 extending in the vertical direction is connected to an exhaust port provided in a side portion of the fan casing 182.

  This boiler apparatus 10 includes a level sensor L1 of a silo part of a fixed amount feeder 11, a temperature sensor T1 of a screw conveyor 9, a gas temperature sensor T2 of a combustion chamber 2, a temperature sensor T4 and a water level sensor L2 of a hot water storage tank 15, Control for controlling the operations of the supply conveyor 12, the shutoff valve 13, the screw conveyor 9, the open / close valve V1, the induction fan 18, the blower 20, and the circulation pump 16 based on the detection information of the temperature sensor T3 and the water level sensor L3 of the water jacket 3. The unit 25 is provided. With this control unit 25, the amount of heat generated in the combustion chamber 2, the water jacket 3 and the water heat exchanger 14 so that the temperature of the hot water storage tank 15 becomes a predetermined temperature and the water level of the hot water storage tank 15 becomes a predetermined water level. And the circulation amount of water in the hot water storage tank 15 is controlled.

  The combustion furnace 1 and the boiler device 10 having the above-described configuration operate as follows. First, these water levels are confirmed by the detection information of the water level sensors of the water heat exchanger 14 and the hot water storage tank 15. When the water level in the water heat exchanger 14 and the hot water storage tank 15 is lower than the reference value, water is supplied to the hot water storage tank 15 through the water supply pipe 151 as indicated by an arrow C. Note that the amount of water supplied to the hot water storage tank 15 through the water supply pipe 151 may be adjusted by a ball tap having a floating ball. When the water levels in the water heat exchanger 14 and the hot water storage tank 15 satisfy the reference values, the induction fan 18 and the blower 20 are started, and the shutoff valve 13 is opened to start the supply conveyor 12 and the screw conveyor 9. The blower 20 is activated to supply combustion air to the upper air chamber 4 through the upper air supply pipe 42 and supply combustion air to the lower air chamber 5 through the lower air supply pipe 52. The shutoff valve 13 is opened, the feed conveyor 12 and the screw conveyor 9 are started, the wood chips of the fuel F are unwound from the fixed quantity feeder 11 by the feed conveyor 12, and pass through the shutoff valve 13 to the combustion chamber 2 by the screw conveyor 9. Fuel F is charged.

  In the combustion furnace 1, the combustion air supplied to the upper air chamber 4 is supplied to the combustion chamber through the air supply pipes 71, 72 and 73. At this time, the combustion air blown from the first air supply pipe 71 that is the first swirl flow pipe in the eccentric direction of the central axis of the combustion chamber 2 and the second air supply pipe 72 that is the downflow pipe blown to the bottom surface side. Combustion air and combustion air blown out from the third air supply pipe 73, which is the second swirl flow pipe, in the eccentric direction of the central axis of the combustion chamber 2 in the eccentric direction opposite to the first air supply pipe 71 are mixed. To do. Thereby, a turbulent flow of combustion air is formed in the vicinity of the region surrounded by the air supply pipes 71, 72, 73 of the combustion chamber 2 as indicated by an arrow A2. From the fuel supply port 91a located at the lower part of the region where the turbulent flow is formed, the fuel F supplied by the screw conveyor 9 is input into the combustion chamber 2 as indicated by an arrow F1, and the injected fuel F is It is held on the bottom plate 6 of the combustion chamber 2.

  The fuel F held on the bottom plate 6 is ignited by a burner (not shown) that operates with petroleum fuel, and is indicated by an arrow A1 from the lower air chamber 5 through the through holes 61, 61,. The primary combustion air supplied to is received and combustion starts. In the fuel F that has started to burn upon receiving the primary combustion air, the combustion components are efficiently burned by the turbulent flow of the secondary combustion air supplied from the air supply pipes 71, 72, and 73. The combustion gas generated with the combustion of the fuel F flows in a swirling manner as indicated by an arrow A3 above the region where the turbulent flow in the combustion chamber 2 is generated. Thus, according to the combustion furnace 1 of the present embodiment, the fuel F is held on the bottom plate 6 below the region where the turbulent flow of combustion air is formed, and the through hole 61 of the bottom plate 6 is provided. , 61,... Is supplied with the primary combustion air, so that the fuel F effectively starts to burn. Further, since the turbulent flow of the secondary combustion air is formed above the region where the primary combustion air is supplied, the combustion components generated from the fuel F accompanying the combustion are sufficiently combusted in the high-temperature turbulent region. And is completely burned. Therefore, generation of carbon monoxide and soot can be effectively reduced, and a stable amount of heat can be obtained while using the fuel F that is a plant-based regenerated fuel. As a result, it is possible to prevent the danger that carbon monoxide leaks to the periphery of the boiler device 10 and the inconvenience that soot accumulates in the water heat exchanger 14 and the heat exchange capability decreases. Combustion gas generated by combustion in the combustion chamber 2 is sent to the water heat exchanger 14 through the exhaust pipe 22.

  The combustion gas sent to the water heat exchanger 14 is introduced into the front smoke chamber 145 of the water heat exchanger 14 through the exhaust pipe 22 and exchanges heat with the water in the water can 149 while passing through the smoke pipes 148 and 149. . The combustion gas that has reached the rear smoke chamber 146 is guided to the cyclone dust collector 17. In the cyclone dust collecting device 17, the combustion gas flowing in from the suction port of the cylindrical portion 171 is guided to the separation portion 172, and dust is separated by centrifugal force when flowing in the separation portion 172 in a swirling manner. The dust separated from the combustion gas is collected in a dust container 174 below the cyclone dust collector 17. The combustion gas from which the dust has been separated passes through the exhaust pipe 175, is sucked into the induction fan 18 through the exhaust pipe 176 connected to the exhaust tower 175, and is exhausted through the chimney 19. A bag filter for removing fine particles contained in the combustion gas may be connected to the downstream side of the attracting fan 18.

  The water in the hot water storage tank 15 is sent to the water jacket 3 of the combustion furnace 1 through the heating feed pipe 33 by the circulation pump 16. The water heated by receiving heat transmitted from the combustion chamber 2 in the water jacket 3 is guided to the water can 149 of the water heat exchanger 14 through the drain pipe 32 and exchanges heat with the combustion gas in the water heat exchanger 14. And then heated further. The water heated by the water heat exchanger 14 is returned to the hot water storage tank 15 through the heating return pipe 81.

  The control unit 25 controls the operation of the supply conveyor 12, the shutoff valve 13 and the screw conveyor 9 based on the temperature of the water in the hot water storage tank 15 detected by the temperature sensor T4, and the amount of fuel F supplied to the combustion chamber 2 And the operations of the induction fan 18 and the blower 20 are controlled to control the amount of combustion air supplied to the combustion chamber 2. When the water temperature of the hot water storage tank 15 is lowered due to the addition of the low temperature water from the water supply pipe 151 as the water of the hot water storage tank 15 is consumed by the use facility, the control unit 25 increases the temperature of the water of the hot water storage tank 15. Control the combustion mode. That is, the shutoff valve 13 is opened, the supply amount of the fuel F by the supply conveyor 12 and the screw conveyor 9 is increased, and the supply amount of the combustion air to the combustion chamber 2 is increased by increasing the supply amount of the blower 20. In addition, the suction amount of the attracting fan 18 is increased to increase the amount of combustion gas sucked from the water heat exchanger 14 of the cyclone dust collector 17. Furthermore, the amount of water sent to the circulation pump 16 is increased, and the amount of water sent to the water jacket 3 and the water heat exchanger 14 is increased. As a result, the amount of heat generated by burning the fuel F in the combustion chamber 2 increases, the amount of water heated by the water jacket 3 and the water heat exchanger 14 increases, and the water temperature of the hot water storage tank 15 rises. When the water in the hot water storage tank 15 reaches a predetermined temperature, the control unit 25 reduces the amount of fuel F supplied by the supply conveyor 12 and the screw conveyor 9 and decreases the amount of air blown by the blower 20 to burn into the combustion chamber 2. The supply amount of air is decreased, the suction amount of the induction fan 18 is decreased, the amount of combustion gas sucked from the water heat exchanger 14 is decreased, and the water supply amount of the circulation pump 16 is decreased. When the supply of the fuel F from the supply conveyor 12 to the screw conveyor 9 is stopped, the shutoff valve 13 is closed to prevent the backflow of combustion gas and combustion air from the combustion chamber 2.

  When the water heating operation by the water heat exchanger 14 is stopped due to the stop of the use of hot water or the like, the control unit 25 stops the control of the combustion mode and controls the standby mode. That is, the fuel supply amount by the supply conveyor 12 and the screw conveyor 9 is made smaller than that in the combustion mode, and the suction amount of the attracting fan 18 and the blower 20 are made smaller than those in the combustion mode. Further, water supply to the water heat exchanger 14 by the circulation pump 16 is stopped. As a result, in the state where the supply of heat to the water heat exchanger 14 is substantially stopped, the combustion chamber 2 holds the seed fire. In this way, the minimum amount of fuel F is held in the receiving portion 62 of the bottom plate 6 facing the combustion chamber 2, and the use of warm water is resumed by leaving the fuel F to leave a seed flame. If the amount of fuel supplied by the supply conveyor 12 and the screw conveyor 9 and the amount of air blown from the blower 20 are increased when operation is required, the amount of heat generated in the combustion chamber 2 can be quickly recovered by quickly igniting the fuel F. can do. That is, it is possible to quickly move from the standby mode to the combustion mode, and to quickly respond to the demand for hot water. In the standby mode, the supply of the fuel F by the supply conveyor 12 and the screw conveyor 9 may be performed continuously or intermittently. In short, it suffices if fuel F can be supplied to the extent that it can hold the seed fire.

  In 1st Embodiment, although the combustion furnace 1 supplied heat to the water heat exchanger 14 as a thermal equipment, you may supply heat to another thermal equipment. Further, the combustion furnace 1 includes the water jacket 3 on the outer peripheral side of the combustion chamber 2, but the water jacket 3 may not be provided.

  FIG. 8 is a longitudinal sectional view showing the combustion furnace of the second embodiment. As in the first embodiment, the combustion furnace 100 of this embodiment uses wood chips, which are plant-based regenerated fuels, as fuel.

  The combustion furnace 100 according to the second embodiment includes a cylindrical combustion chamber 2, a cylindrical combustion chamber wall 21 formed of a castable refractory and surrounding the combustion chamber 2, and a cylindrical shape surrounding the outer surface of the combustion chamber wall 21. The upper casing 31 and a cylindrical ring-shaped upper air chamber 400 disposed substantially at the center in the height direction on the outer peripheral side of the main casing 31.

  A plurality of air supply pipes 71, 72, 73, 74, 75 for blowing combustion air into the combustion chamber 2 are fixed through the side surfaces of the combustion chamber wall 21 and the upper casing 31. In the combustion furnace 100 of the second embodiment, five stages of air supply pipes 71, 72, 73, 74, 75 are arranged in the axial direction of the combustion chamber 2. These air supply pipes 71, 72, 73, 74, 75 have a side air passage formed therein, and are fixed to be inclined with respect to the radial direction or the axial direction of the combustion chamber 2.

  9 is a longitudinal sectional view showing the air supply pipes 71,..., 75 and the upper air chamber 400 for supplying combustion air to these air supply pipes 71,. As shown in FIG. 9, the upper air chamber 400 includes annular first to fifth air chambers 401, 402, 403, 404, and 405 that are separated from each other and surround the upper casing 31. The first to fifth air chambers 401, 402, 403, 404, and 405 are formed by first to fifth air chamber walls 411, 421, 431, 441, and 451, respectively. The first to fifth air chambers 401, 402, 403, 404, 405 communicate with the air supply pipes 71, 72, 73, 74, 75, respectively. The first to fifth air chambers 401, 402, 403, 404, and 405 extend in a tangential direction on the cylindrical ring-shaped side surfaces of the first to fifth air chamber walls 411, 421, 431, 441, and 451. First to fifth supply pipes 412, 422, 432, 442, 452 are connected to each other. As shown by arrows A11, A12, A13, A14, A15 through these first to fifth air supply pipes 412, 422, 432, 442, 452, first to fifth air chambers 401, 402, 403, 404, 405 is each supplied with combustion air. From the first to fifth air supply pipes 412, 422, 432, 442, 452 to the first to fifth air chambers 401, 402, 403, 404, 405, the first to fifth air chamber walls 411, 421, 431, By supplying combustion air in the tangential direction of the side surfaces of 441 and 451, a uniform flow of combustion air is obtained in the circumferential direction of the first to fifth air chambers 401, 402, 403, 404, and 405. Thereby, the flow rate of the combustion air supplied from the air supply pipes 71,..., 75 to the combustion chamber 2 is formed to be uniform in the circumferential direction.

  The flow rate of the combustion air supplied from the first to fifth supply pipes 412, 422, 432, 442, 452 to the first to fifth air chambers 401, 402, 403, 404, 405 is the first to fifth supply pipes 412. , 422, 432, 442, 452 can be adjusted independently. Thereby, the flow volume of the combustion air which blows off from each air supply pipe 71 ...... 75 to the combustion chamber 2 can be adjusted independently of each other.

  Of the air supply pipes 71, 72, 73, 74, 75 through which the combustion air is supplied through the first to fifth air chambers 401, 402, 403, 404, 405, the first closest to the top surface of the combustion chamber 2. As in the first embodiment, the air supply pipe 71 is parallel to a plane perpendicular to the central axis of the combustion chamber 2 and is clockwise with respect to the radial direction when viewed from the central axis direction of the combustion chamber 2. It is the 1st swirl flow pipe arrange | positioned at the inclination | tilt angle (alpha). The second air supply pipe 72 adjacent to the bottom surface side of the combustion chamber 2 of the first air supply pipe 71 is similar to the first embodiment in that the combustion chamber is perpendicular to the plane perpendicular to the central axis of the combustion chamber 2. 2 is a downflow pipe inclined toward the bottom surface of the combustion chamber 2. The third air supply pipe 73 adjacent to the bottom surface side of the combustion chamber 2 of the second air supply pipe 72 is parallel to a plane perpendicular to the central axis of the combustion chamber 2 as in the first embodiment. And a second swirl flow tube arranged at an inclination angle β counterclockwise with respect to the radial direction when viewed from the central axis direction of the combustion chamber 2. The fourth air supply pipe 74 adjacent to the bottom surface side of the combustion chamber 2 of the third air supply pipe 73 is similar to the second air supply pipe 72 with respect to the plane perpendicular to the central axis of the combustion chamber 2. The side facing the combustion chamber 2 is a downflow pipe inclined toward the bottom surface of the combustion chamber 2. A fifth air supply pipe 75 adjacent to the bottom surface side of the combustion chamber 2 of the fourth air supply pipe 74 is a surface perpendicular to the central axis of the combustion chamber 2, similar to the first air supply pipe 71. And a first swirl flow tube disposed at an inclination angle α in the clockwise direction with respect to the radial direction when viewed in the direction of the central axis of the combustion chamber 2.

  As described above, the air supply pipes 71, 72, 73, 74, and 75 sequentially turn the clockwise swirling flow, the descending flow, the counterclockwise swirling flow, and the descending flow from the top surface side of the combustion chamber 2. Then, a clockwise swirling flow is blown into the combustion chamber 2. By mixing these combustion air flows in the combustion chamber 2, the combustion air turbulent flow is stabilized in and around the air supply pipes 71, 72, 73, 74, and 75 of the combustion chamber 2. It is formed to form. A swirling flow of combustion gas formed by burning fuel is formed on the top surface side of the turbulent flow formation region of the combustion chamber 2, and this combustion gas is supplied to a water heat exchanger (not shown) through the exhaust pipe 22. Is done.

  FIG. 10 is a cross-sectional view of the vicinity of the bottom surface of the combustion chamber 2 included in the combustion furnace 100 of the second embodiment. On the bottom surface of the combustion chamber 2 of the combustion furnace 100 of this embodiment, a screw conveyor 109 as a fuel supply unit and a rotating tray 106 that holds and rotates the fuel supplied by the screw conveyor 109 are provided. The screw conveyor 109 extends in the vertical direction and is disposed concentrically with the central axis of the combustion chamber 2. The screw conveyor 109 is formed of a cylindrical casing 91, a rotary drive shaft 92 and a conveying screw 93 arranged in the casing 91, and the fuel F supplied from a supply conveyor of a metering feeder (not shown) is supplied to the combustion chamber 2. It is comprised so that it may supply to the center of a bottom face from the downward direction.

  On the bottom surface of the combustion chamber 2, a frustoconical rotary tray 106 is disposed so as to surround the tip of the screw conveyor 109. The rotating tray 106 includes a plurality of slit-shaped air supply holes 107, 107,... Extending in the radial direction, a plurality of scrapers 108, 108,. A rack 111 is included. The rotating tray 106 is rotatably supported on a support wall 503 in the lower air chamber 500 via a bearing 110.

  The lower air chamber 500 is formed in the lower part of the cylindrical lower casing 501, and combustion air is supplied through a lower air supply pipe 502 provided on the bottom surface as indicated by an arrow A21. On a support wall 503 that defines the lower air chamber 500, a bearing 110 that rotatably supports the rotating tray 106 is installed. Combustion air is supplied to the lower side of the rotating tray 106 through an air vent 505 provided on the top surface of the lower air chamber 500, as indicated by an arrow A22. The combustion air passes through the air supply hole 107 as indicated by an arrow A23, and is blown out to the upper side of the rotating tray 106 to supply the combustion air to the fuel on the rotating tray 106.

  In the lower casing 501, a pinion 112 that meshes with a rack 111 provided on the back surface of the rotating tray 106 is disposed. The pinion 112 is connected to the output shaft of the motor 113 disposed outside the lower casing 501. The rotational force of the cage motor 113 is transmitted to the rack 111 via the pinion 112, and the rotation tray 106 is rotated.

  The scraper 108 provided on the peripheral edge of the rotating tray 106 is formed of a support rotating shaft extending in the radial direction of the rotating tray 106 and a rectangular scraper body formed to be rotatable around the supporting rotating shaft. The scraper 108 is fitted inside an annular flange 506 formed to project from the inner surface of the lower casing 501 to the inner diameter side, and slides inside the annular flange 506 as the rotating tray 106 is driven to rotate. It is formed to do. An ash removal hole (not shown) is provided on the bottom surface of the annular trough 506. Fuel ash or the like that has moved from the upper surface of the frustoconical rotating tray 106 to the outer diameter side falls into the annular trough 506. The ash or the like is collected by a scraper 108 that rotates together with the rotating tray 106, and is discharged from the ash outlet hole to the outside.

  In the combustion furnace 100 of the second embodiment, five stages of air supply pipes 71, 72, 73, 74, 75 blow out from the air supply pipes 71, 72, 73, 74, 75 adjacent in the axial direction of the combustion chamber 2. The flow directions of the combustion air are different from each other, the flow of combustion air from the air supply pipes 71 and 75 on the top surface side and the bottom surface side in the axial direction of the combustion chamber 2 is the same direction, and The flow of combustion air from the central air supply pipe 73 in the axial direction is opposite to the flow of combustion air from the top and bottom air supply pipes 71 and 75. Furthermore, the flow of the combustion air by the air supply pipes 72 and 74 between the air supply pipes 71, 73 and 75 on the top surface side, the center and the bottom surface side in the axial direction of the combustion chamber 2 is the bottom side of the combustion chamber 2. It is. Thereby, a stable turbulent flow of combustion air can be formed in the combustion chamber 2, and the fuel can be stably burned completely.

  In the present embodiment, the first to fifth air chambers 401, 402, 403 from the first to fifth air supply pipes 412, 422, 432, 442, 452 to the five-stage air supply pipes 71, 72, 73, 74, 75 are provided. , 404, and 405, the combustion air is individually supplied, but the combustion air is supplied from a single air supply pipe to the air supply pipes 71, 72, 73, 74, and 75 through a single or a plurality of air chambers. May be. Further, the amount of combustion air blown out by the five-stage air supply pipes 71, 72, 73, 74, 75 may be appropriately changed to change the form of turbulent flow of combustion air formed in the combustion chamber 2. In addition, the combustion chamber 2 is not limited to the turbulent flow, and only the first air supply pipe 71 formed by the first swirling flow pipe blows out combustion air to form only the swirling flow, or the second flowing by the downflow pipe. The combustion air may be blown out only from the air supply pipe 72 to form only a downward flow, or the combustion air may be blown out only from the third air supply pipe 73 by the second swirl flow pipe to form only the swirl flow.

  Also, the air supply pipe is inclined with respect to a plane perpendicular to the central axis of the combustion chamber 2 and is inclined with respect to the radial direction when viewed from the central axis direction of the combustion chamber 2, and is raised and swirled. Alternatively, a pipe that descends and blows combustion air in the swirling direction may be used.

  Moreover, in the said 1st Embodiment, it arrange | positions with respect to the central axis of the combustion chamber 2, and the screw conveyor 9 which supplies a fuel from the side surface of the combustion chamber 2 is installed as a fuel supply part, The said 2nd Embodiment. Then, although the screw conveyor 109 which is arrange | positioned concentrically with the center axis | shaft of the combustion chamber 2 and supplies a fuel from the bottom face of the combustion chamber 2 was installed as a fuel supply part, the form of a fuel supply part is not limited to these.

  In the first embodiment, three stages of air supply pipes 71, 72, 73 are arranged. In the second embodiment, five stages of air supply pipes 71, 72, 73, 74, 75 are arranged. The number of stages of the tube is not limited to these, and may be any number of two or more stages. Further, the type of the air supply pipe installed in each stage can be appropriately set according to the degree of turbulent flow to be formed in the combustion chamber 2.

  Moreover, in the said embodiment, although the fuel which consists of a wood chip | tip was used as a plant-type regenerated fuel, you may use the regenerated fuel which shape | molded plant-type materials like a wood pellet. Plant-based materials include wood-based materials such as sawdust, wood chips, thinning and pruning materials, agricultural materials such as rice straw, rice husks, weeds and bagasse, waste-based materials such as construction waste, and waste paper And paper-based materials such as waste pulp. Further, the plant-based regenerated fuel may be a fuel partially using a plant-based material, for example, RPF.

DESCRIPTION OF SYMBOLS 1 Combustion furnace 2 Combustion chamber 4 Upper air chamber 6 Bottom plate 9 Screw conveyor 61 Bottom plate through-hole 71, 72, 73 Air supply pipe

Claims (9)

A combustion furnace for burning plant regenerated fuel,
A cylindrical combustion chamber;
A combustion furnace comprising a plurality of side air passages provided on a side surface of the combustion chamber and for blowing combustion air in directions different from each other with respect to a radial direction of the combustion chamber. The combustion furnace according to claim 1,
The side air passage includes a first air passage inclined to one side in the radial direction within a plane perpendicular to the axis of the combustion chamber, and a second air inclined to the other side in the radial direction within the plane perpendicular to the axis of the combustion chamber. A passage, a third air passage inclined toward the bottom surface side of the combustion chamber within the shaft inclusion surface of the combustion chamber, and a fourth air passage inclined toward the top surface side of the combustion chamber within the shaft inclusion surface of the combustion chamber A combustion furnace comprising at least two of the following. The combustion furnace according to claim 1,
The combustion air furnace according to claim 1, wherein the side air passage is formed by a plurality of air supply pipes that are disposed through a wall that defines the combustion chamber. The combustion furnace according to claim 1,
A combustion furnace comprising an air chamber that is provided on an outer peripheral side of the combustion chamber and communicates with the side air passage and is supplied with combustion air blown out to the combustion chamber through the side air passage. The combustion furnace according to claim 4, wherein
The air chamber has a cylindrical ring shape, and combustion air is supplied in a tangential direction of a side surface of the cylindrical ring-shaped air chamber. The combustion furnace according to claim 4, wherein
A combustion furnace characterized in that a plurality of the air chambers are provided corresponding to the plurality of side air passages. The combustion furnace according to claim 1,
A combustion furnace comprising a bottom air passage for blowing combustion air into the combustion chamber on a bottom surface of the combustion chamber. The combustion furnace according to claim 1,
A combustion furnace comprising a fuel supply port for supplying fuel into the combustion chamber on a bottom surface side of a position where the side air passage of the combustion chamber is installed. The combustion furnace according to claim 1,
A combustion furnace comprising a fuel supply port for supplying fuel into the combustion chamber on a bottom surface of the combustion chamber.

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