JP2015025642A - Heat exchanger integrated combustion furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger integrated combustion furnace capable of improving a hot-water production capability regarding a combustion furnace for combusting biomass fuel and a heat exchanger using this combustion furnace as a heat source.SOLUTION: A heat exchanger integrated combustion furnace 1 is formed by lining up a rectangular parallelepiped combustion part 2, a first heat exchange part 3 and a second heat exchange part 4 in a rectangular parallelepiped shape. In a combustion chamber 8 of the combustion part 2, upward combustion air is supplied from a through hole 11 of a bottom face plate 10, combustion air in an eccentric direction is supplied from a lower-stage air supply pipe 25 disposed in an upper portion of an inner wall surface into an axially perpendicular plane, and combustion air in an eccentric direction opposite to the lower-stage air supply pipe 25 is supplied from an upper-stage air supply pipe 26 disposed in an upper portion of the inner wall surface towards a bottom face. A disturbance of combustion air is formed in an upper portion of the combustion chamber 8 and combustion gas and combustion air are stirred, mixed and completely combusted, thereby improving heat exchange efficiency of the first heat exchange part 3 and the second heat exchange part 4.

Description

  The present invention relates to a heat exchanger integrated combustion furnace that generates hot water by burning biomass fuel such as wood chips.

  Conventionally, as a boiler device that generates hot water by burning biomass fuel such as wood chips and wood pellets, a combustion furnace configured to form a swirling flow of combustion gas in a cylindrical combustion chamber is used as a heat source. There was something that was there.

  As this type of conventional combustion furnace, as shown in FIG. 13, a cylindrical first combustion chamber 202 and a second combustion chamber 203 are connected in the axial direction, and an inner wall 221 that defines the first combustion chamber 202. In addition, there is a combustion furnace 201 provided with a plurality of air passages 207 and 208 for supplying combustion air to the combustion chambers 202 and 203 on an inner wall 222 that defines the second combustion chamber 203 (see Patent Document 1). Outer walls 241 and 242 are respectively arranged outside the inner walls 221 and 222 that define the combustion chambers 202 and 203, and preheat the combustion air that leads to the air passages 207 and 208 between the inner walls 221 and 222 and the outer walls 241 and 242. Cylindrical annular air chambers 204 and 205 are formed.

  Fuel 210 is supplied to the first combustion chamber 202 by a screw conveyor 209 installed substantially vertically along the central axis of the combustion chamber 202. The tip of the screw conveyor 209 is a supply port 291 that opens toward the top of the bottom surface of the combustion chamber 202 formed in a conical shape. The fuel supply port 291 of the screw conveyor 209 is provided with a fuel diffusion rod 293 that is connected to the drive shaft 292 of the screw conveyor 209 and is driven to rotate.

  Air passages 207 and 208 formed in the inner walls 221 and 222 are formed so as to incline upward with respect to the horizontal plane toward the radially inner side of the first and second combustion chambers 202 and 203. Further, the first and second combustion chambers 202 and 203 are formed so as to be inclined with respect to the radial direction.

  The fuel 210 guided by the screw conveyor 209 and discharged from the fuel supply port 291 is dispersed on the bottom surface of the combustion chamber 202 by the fuel diffusion rod 293, so that the fuel is burned in the combustion chamber 202 without deviation. Also, by blowing combustion air from the air passages 207 and 208 in a direction inclined with respect to the horizontal plane and the radial direction, a swirl flow is formed in the first and second combustion chambers 202 and 203, and the fuel is burned in two stages. The chambers 202 and 203 are sequentially burned. As a result, biomass fuels such as wood chips that are harder to burn than fossil fuels are stably burned.

  The boiler apparatus configured using the combustion furnace 201 discharges the combustion gas generated in the combustion furnace 201 from the gas discharge pipe 245 and conducts heat exchange with water by guiding to a heat exchanger (not shown) to generate hot water. doing.

JP 2009-162414 A

  However, in the conventional combustion furnace 201, the temperature of the combustion gas is lowered while the combustion gas flows through the two-stage combustion chambers 202 and 203, so that there is a problem that the capability of generating hot water in the heat exchanger is relatively low. is there.

  In the conventional combustion furnace 201, wood chips and wood pellets, which are the fuel 210, are formed from thinned wood, construction waste, or the like. Therefore, incombustible materials such as sand and building hardware fragments are often mixed in the fuel 210. These incombustibles are separated by gravity as the fuel 210 passes through the substantially vertical screw conveyor 209 and stays at the lower end of the screw conveyor 209, so that the conveying blades 294 of the screw conveyor 209 and the inner surface of the casing 295 are retained. There is an inconvenience of promoting wear.

  Then, the subject of this invention is providing the heat exchanger integrated combustion furnace which can improve the production | generation capability of warm water regarding the combustion furnace which burns biomass fuel, and the heat exchanger which uses this combustion furnace as a heat source. . It is another object of the present invention to provide a heat exchanger integrated combustion furnace that can prevent deterioration of parts due to fuel supply and has good durability.

In order to solve the above problems, a heat exchanger integrated combustion furnace of the present invention includes a combustion chamber,
A fuel supply section for supplying fuel to the combustion chamber;
A first combustion air supply unit for supplying combustion air to a lower portion of the combustion chamber;
A second combustion air supply section for supplying combustion air to the upper portion of the combustion chamber so as to disturb the flow of combustion gas directed upward in the combustion chamber;
A combustion gas chamber that is connected to the upper side of the combustion chamber and from which the combustion gas is led, and a water jacket that is disposed so as to surround the combustion gas chamber and is supplied with water that exchanges heat with the combustion gas. A first heat exchange section;
The water exchanged by the water jacket is guided, the water chamber is arranged adjacent to the combustion gas chamber of the first heat exchange unit, and the water chamber is arranged in the water chamber, and the combustion of the first heat exchange unit And a second heat exchange section having a smoke pipe through which the combustion gas led from the gas chamber flows.

  According to the above configuration, fuel is supplied to the combustion chamber by the fuel supply unit, and combustion air is supplied to the lower portion of the combustion chamber by the first combustion air supply unit. When the fuel is combusted in the combustion chamber, a flow in which the combustion gas rises is generated in the combustion chamber. Combustion gas that is directed upward in the combustion chamber by the combustion air supplied to the upper portion of the combustion chamber by the second combustion air supply unit. Is disturbed. As a result, the combustion air and the combustion gas are agitated and mixed, the unburned components of the combustion gas are burned, and the fuel is completely burned. The combustion gas in the combustion chamber is guided to the combustion gas chamber connected to the upper side of the combustion chamber, and heat exchange of the combustion gas and water is performed by the water jacket of the first heat exchanging portion arranged so as to surround the combustion gas chamber. Done. The water exchanged by the water jacket of the first heat exchange unit is guided to the water chamber of the second heat exchange unit arranged adjacent to the combustion gas chamber of the first heat exchange unit, and this second While exchanging heat with the combustion gas flowing through the smoke tubes arranged in the water chamber of the heat exchange section, heat exchange is performed with the heat of the combustion gas chamber of the first heat exchange section adjacent to the water chamber of the second heat exchange section. Thus, since complete combustion is promoted by the disturbance of the combustion gas by the combustion air supplied by the second combustion air supply unit, the combustion efficiency is improved, and water can be heated with better efficiency than before.

  In one embodiment of the heat exchanger integrated combustion furnace, the second combustion air supply unit is arranged on the wall surface of the combustion chamber, and a plurality of the combustion air is blown out in a direction inclined toward the bottom side of the combustion chamber. It has an air outlet.

  According to the embodiment, the combustion air is blown out in the direction inclined toward the bottom side of the combustion chamber from the outlet arranged on the wall surface of the combustion chamber with respect to the flow of the combustion gas in the combustion chamber. The flow of the combustion gas directed upward in the combustion chamber is effectively disturbed. As a result, the combustion gas and the combustion air are stirred and mixed, and the combustion of the unburned components contained in the combustion gas can be promoted to complete combustion, thereby effectively increasing the temperature of the combustion gas. Here, the direction in which the outlet of the second combustion air supply section blows out the combustion air may be inclined to the bottom side with respect to the plane perpendicular to the central axis of the combustion chamber, and the angle with respect to the normal of the wall surface of the combustion chamber Is not limited. That is, the air outlet of the second combustion air supply unit may blow the combustion air in the direction normal to the wall surface of the combustion chamber, or the combustion air may be blown in a direction inclined with respect to the normal direction of the wall surface of the combustion chamber. You may blow out. When the outlet of the second combustion air supply section blows combustion air in the normal direction of the wall surface of the combustion chamber, the turbulence generated by the collision between the blown combustion air and the combustion gas rising in the combustion chamber is It stops substantially in the direction around the axis. On the other hand, when the blowout port of the second combustion air supply unit blows out combustion air in a direction inclined with respect to the normal direction of the wall surface of the combustion chamber, the blown out combustion air collides with the combustion gas rising in the combustion chamber. The turbulence generated in this way turns in the direction in which the flow from the outlet is inclined.

In one embodiment of the heat exchanger-integrated combustion furnace, the second combustion air supply unit includes:
A plurality of first air outlets arranged on the wall surface of the combustion chamber and for blowing combustion air in a direction inclined with respect to the normal line of the wall surface in a plane perpendicular to the axis of the combustion chamber;
A direction that is arranged on the wall surface of the combustion chamber on a side farther from the bottom of the combustion chamber than the first outlet and is inclined toward the bottom side of the combustion chamber, and a normal line of the wall surface of the combustion chamber On the other hand, it has a plurality of second outlets for blowing out combustion air in a direction inclined to the opposite side to the first outlet.

  According to the above-described embodiment, the combustion air is blown out from the plurality of first outlets of the second combustion air supply section in a direction inclined with respect to the normal to the wall surface in the plane perpendicular to the axis of the combustion chamber, Is formed. A direction inclined toward the bottom side of the combustion chamber from the second blower outlet disposed on the side farther from the bottom of the combustion chamber than the first outlet, and with respect to the normal of the wall surface of the combustion chamber Combustion air is blown out in a direction inclined to the opposite side to the first air outlet, and collides with a swirling flow caused by the combustion air from the first air outlet, thereby forming combustion air turbulence. Thereby, the combustion gas and the combustion air rising in the combustion chamber are effectively stirred and mixed, the combustion of the unburned components of the fuel is promoted, the fuel is completely burned, and the combustion temperature is effectively increased.

  In one embodiment of the heat exchanger integrated combustion furnace, the second combustion air supply unit is disposed so as to surround the outside of the combustion chamber and communicates with the first air outlet. An air chamber is provided that swirls the combustion air in the same direction as the inclination direction with respect to the normal of the wall surface that blows the combustion air into the combustion chamber.

  According to the above embodiment, in the air chamber arranged so as to surround the outer peripheral side of the combustion chamber, the combustion air is in the same direction as the inclination direction with respect to the normal of the wall surface from which the first outlet blows the combustion air to the combustion chamber. Turn. As a result, it is possible to form a swirling flow toward the first heat exchange part while forming turbulence in the combustion chamber and effectively stirring and mixing the combustion air with the combustion gas in the combustion chamber.

  In one embodiment of the heat exchanger-integrated combustion furnace, the fuel supply unit has a fuel supply port provided on a wall surface of the combustion chamber.

  According to the above embodiment, the fuel supply unit supplies the fuel from the fuel supply port provided on the wall surface of the combustion chamber, so that it is not necessary to send the fuel in the vertical direction as in the prior art. The inconvenience that a fuel supply part is damaged by an incombustible can be prevented.

  In one embodiment of the heat exchanger integrated combustion furnace, the first combustion air supply unit has a bottom outlet that supplies combustion air upward from the bottom of the combustion chamber.

  According to the above embodiment, the combustion air is supplied upward from the bottom of the combustion chamber through the bottom outlet of the first combustion air supply unit, so that an upward flow can be formed in the combustion chamber. Here, it is preferable to dispose a plurality of bottom outlets in a dispersed manner at the bottom of the combustion chamber.

  In the heat exchanger integrated combustion furnace of one embodiment, the bottom member that forms the bottom of the water chamber of the second heat exchange unit also serves as the ceiling member that forms the ceiling of the combustion gas chamber of the first heat exchange unit. ing.

  According to the above embodiment, the bottom member of the water chamber of the second heat exchange unit also serves as the ceiling member of the combustion gas chamber of the first heat exchange unit. Since the water that exchanges heat with the introduced combustion gas can also be heated by the heat of the combustion gas in the combustion gas chamber of the first heat exchange section, the heating efficiency of the water in the second heat exchange section can be improved. In addition, the heat efficiency of the second heat exchange section is improved because heat dissipation to the outside air can be prevented as in the case where the bottom member of the water chamber is formed in contact with the outside air as in the water chamber of a normal heat exchanger. it can. Moreover, since a duct required when installing a combustion gas chamber and a 2nd heat exchange part separately can be deleted, the heat loss by a duct can be reduced, a thermal efficiency can be improved, and the number of parts can be made small.

  In the heat exchanger integrated combustion furnace according to an embodiment, the second heat exchange unit is a three-pass multi-tube heat exchanger.

  According to the said embodiment, size reduction can be achieved by forming a 2nd heat exchange part with a 3-pass multi-tube heat exchanger.

The heat exchanger integrated combustion furnace of an embodiment includes a control unit that controls the fuel supply unit and a blower that supplies combustion air to the combustion chamber.
The control unit controls a fuel supply amount by the fuel supply unit and a blown amount by the blower to adjust a heat amount to be generated in the combustion chamber, a fuel supply amount by the fuel supply unit, and the blower And a standby mode in which the combustion chamber holds the seed fire by controlling the amount of blown air to a smaller amount than in the combustion mode.

  According to the embodiment, the operation of the fuel supply unit that supplies fuel to the combustion chamber and the operation of the blower that supplies combustion air to the combustion chamber are controlled by the control unit. In the combustion mode, the controller controls the amount of fuel supplied by the fuel supply unit and the amount of air blown by the blower to adjust the amount of heat generated in the combustion chamber to a predetermined amount of heat. As a result, the heat generated in the combustion chamber is adjusted to an amount at which a predetermined temperature can be obtained in the first heat exchange unit and the second heat exchange unit, and the temperature discharged from the second heat exchange unit is controlled to a predetermined temperature. To do. On the other hand, in the standby mode, the control unit controls the amount of fuel supplied by the fuel supply unit and the amount of air blown by the blower to an amount smaller than that in the combustion mode, and holds the seed fire in the combustion chamber. In this standby mode, if the amount of combustion air blown into the combustion chamber and the amount of fuel supplied are increased, a predetermined amount of heat can be obtained quickly, so that the combustion mode can be quickly entered. Accordingly, a heat exchanger-integrated combustion furnace that can be restarted quickly despite the use of biomass fuel that is less ignitable than fossil fuel is obtained.

It is a front longitudinal section showing a heat exchanger integrated combustion furnace of an embodiment of the present invention. It is a side longitudinal section showing the heat exchanger integrated combustion furnace of an embodiment. 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 2nd blower outlet. It is a plane sectional view showing arrangement of a lower air supply pipe which constitutes the 2nd combustion air supply part. It is a plane sectional view showing arrangement of an upper stage air supply pipe which constitutes the 2nd combustion air supply part. It is a plane sectional view in the arrangement position of the lower air supply pipe of an air chamber and a combustion chamber. It is a plane sectional view in the arrangement position of the upper air supply pipe of an air chamber and a combustion chamber. It is a longitudinal cross-sectional view which shows arrangement | positioning of another air supply pipe. It is a plane sectional view showing arrangement of other air supply pipes. It is a schematic diagram which shows a boiler apparatus. It is a schematic diagram which shows the conventional combustion furnace.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a front longitudinal sectional view showing a heat exchanger integrated combustion furnace according to an embodiment of the present invention, and FIG. 2 is a view around a central axis of a combustion chamber with respect to a cut surface showing the front longitudinal sectional view of FIG. It is a side surface longitudinal cross-sectional view in the cut surface which makes 90 degrees. The heat exchanger integrated combustion furnace 1 according to the present embodiment uses a wood chip, which is a biomass fuel, as fuel, and heats water to generate hot water. Here, the central axis of the combustion chamber refers to an axis that extends in the vertical direction of the combustion chamber through an intersection of diagonal lines in the plane cross section of the combustion chamber.

  The heat exchanger integrated combustion furnace 1 includes a combustion unit 2 that burns fuel, a first heat exchange unit 3 that is connected to the combustion unit 2 and exchanges heat between combustion gas generated in the combustion unit 2 and water. The second heat exchanging unit 4 is connected to the first heat exchanging unit 3 and further exchanges heat of the water heat exchanged by the first heat exchanging unit 3.

  The combustion unit 2 is a rectangular parallelepiped having a rectangular cross section inside a wall body 9 formed by a box-shaped combustion chamber casing 5, a heat insulating material 6 provided inside the combustion chamber casing 5, and a castable refractory 7. A combustion chamber 8 is formed. The heat insulating material 6 can use what was formed, for example with the ceramic board, and the castable refractory 7 can use what was formed with alumina concrete, for example. By using a refractory for the wall surface of the combustion chamber 8, heat can be stored and radiant heat can be released, and fuel combustion can be promoted. Therefore, the fuel in the combustion chamber 8 can be burned quickly. Instead of the indeterminate castable refractory 7, a regular refractory such as a refractory brick may be used. Moreover, as a refractory material, what was formed, for example with silica, zirconia, magnesia, lime, etc. other than an alumina can be used.

  The combustion unit 2 includes a screw conveyor 18 as a fuel supply unit that supplies wood chips of fuel into the combustion chamber 8, and a bottom plate 10 that forms a first combustion air supply unit that supplies combustion air from the bottom surface of the combustion chamber 8. Through-hole 11 and bottom air chamber 13, lower air supply pipe 25 forming the first air outlet of the second combustion air supply part, and upper air supply pipe forming the second air outlet of the second combustion air supply part 26, a lower air chamber 28a for supplying combustion air to the lower air supply pipe 25, and an upper air chamber 28b for supplying combustion air to the upper air supply pipe 26. The lower air supply pipe 25 and the upper air supply pipe 26, and the lower air chamber 28a and the upper air chamber 28b form a second combustion air supply section.

  The lower air supply pipe 25 and the upper air supply pipe 26 that form the second combustion air supply section are fixed to the upper portion of the wall body 9 that forms the combustion chamber 8 therein. The lower air supply pipe 25 and the upper air supply pipe 26 have a combustion air passage formed therein, and an opening facing the combustion chamber 8 serves as a blowout port. As will be described in detail later, the lower air supply pipe 25 and the upper air supply pipe 26 are fixed to be inclined with respect to the normal direction or the axial direction of the wall surface of the combustion chamber 8. The lower air chamber 28 a and the upper air chamber 28 b are formed inside an air chamber wall 27 installed so as to surround the peripheral surface of the combustion chamber casing 5, and a lower air supply pipe 29 a connected to the air chamber wall 27. As shown by arrows A2 and A3, combustion air is supplied through the upper air supply pipe 29b. The combustion air supplied to the lower air chamber 28a and the upper air chamber 28b is supplied to the combustion chamber 8 through the lower air supply pipe 25 and the upper air supply pipe 26, and the lower air supply pipe 25 and the upper air combustion pipe 8 are supplied. Turbulence of combustion air is formed in a region surrounded by the air supply pipe 26. The high-temperature combustion gas generated by burning the fuel in the combustion chamber 8 is agitated with the flow disturbed by the combustion air in the region surrounded by the lower air supply pipe 25 and the upper air supply pipe 26 of the combustion chamber 8, Combustion is promoted. Thereafter, the gas flows into the combustion gas chamber 35 of the first heat exchanging unit 3 connected to the combustion chamber 8.

  On the bottom surface of the combustion chamber 8, a rectangular plate-like bottom plate 10 that is fitted into the lower end of the wall body 9 is disposed, and a bottom air chamber 13 is disposed below the bottom plate 10. The bottom air chamber 13 is formed in a box-shaped bottom casing 14. In the bottom plate 10, a plurality of through holes 11, 11,... For guiding the combustion air from the bottom air chamber 13 to the combustion chamber 8 are formed dispersed over the entire surface. An opening facing the combustion chamber 8 of the through hole 11 of the bottom plate 10 functions as a bottom outlet. Combustion air is supplied to the bottom air chamber 13 through a lower air supply pipe 15 connected to the bottom casing 14 as indicated by an arrow A1.

  The lower air chamber 28a and the upper air chamber 28b and the bottom air chamber 13 are connected to the lower air chamber 28a and the upper air chamber 28b connected to the lower air chamber 28a and the upper air chamber 28b. Combustion air is supplied through the lower air supply pipe 15 connected to the lower air supply pipe 29a, the upper air supply pipe 29b, and the blower 64 connected to the upstream side of the lower air supply pipe 15.

  FIG. 4 is a perspective view showing the bottom plate 10. The bottom plate 10 is formed by casting a castable refractory into a rectangular plate shape, and has a plurality of through holes 11, 11,. The fuel supplied from the screw conveyor 17 as a fuel supply unit and discharged from the fuel supply port 21 is dropped and received on the surface of the bottom plate 10 as shown by an arrow F in FIG. The bottom plate 10 holds fuel to be burned when operating in the combustion mode. On the other hand, when performing the operation in the standby mode, the fuel in the ignited state is held as a seed fire. If the supply of fuel and combustion air to the combustion chamber 8 increases because the bottom plate 10 holds the seed fire during the standby mode, the mode can be quickly shifted to the normal mode.

  On the side surface of the combustion chamber 8, a screw conveyor 17 is installed as a fuel supply unit for supplying fuel. The screw conveyor 17 is formed of a cylindrical casing 18 and a conveying screw 19 disposed in the casing 18 and driven to rotate. One end of the screw conveyor 17 is connected to a charging pipe 20 through which fuel is guided. The input pipe 20 is connected to a supply conveyor of a fixed quantity feeder that stores and supplies fuel via a shut-off valve. At the other end of the screw conveyor 17, a fuel supply port 21 that opens to the side surface of the combustion chamber 8 is provided. The center in the height direction of the fuel supply port 21 is installed at a position lower than the region where the lower air supply pipe 25 and the upper air supply pipe 26 are arranged. The center in the height direction of the fuel supply port 21 may be installed at a position lower than the center in the height direction of the region where the lower air supply pipe 25 and the upper air supply pipe 26 are arranged. Here, the height direction is substantially the same as the extending direction of the central axis of the combustion chamber 8, and the low side is the side close to the bottom surface of the bottom casing 14, and the high side is high. The side is a side close to the first heat exchange unit 3. The screw conveyor 17 is inclined so that its position increases as it goes from one end to the other end. This makes it difficult for high-temperature combustion air to flow back through the screw conveyor 17. In the vicinity of the fuel supply port 21 on the wall surface of the combustion chamber 8, an ignition port 23 provided at substantially the same height as the fuel supply port 21 is provided. The ignition port 23 is connected to an outlet of an ignition burner (not shown), and a flame generated by the ignition burner (not shown) is emitted from the ignition port 23 when the heat exchanger integrated combustion furnace 1 is operated. ing.

  FIG. 5 is a longitudinal sectional view showing the arrangement of the lower air supply pipe 25 and the upper air supply pipe 26 installed on the side surface of the combustion chamber 8. FIG. 5 is a cross-sectional view showing a state in which the wall body 9 is cut in a plane including the central axis of the combustion chamber 8 at the installation positions of the lower air supply pipe 25 and the upper air supply pipe 26. In addition, in FIG. 5, the inclination with respect to the normal line direction of the wall surface of the lower stage air supply pipe 25 and the upper stage air supply pipe 26 is not expressed.

  As shown in FIG. 5, in the heat exchanger integrated combustion furnace 1 of the present embodiment, two stages of air supply pipes 25 and 26 are arranged in the extending direction of the central axis of the combustion chamber 8. Of these air supply pipes 25, 26, the lower air supply pipe 25 located on the bottom side of the combustion chamber 8 faces parallel to a plane perpendicular to the central axis of the combustion chamber 8. As shown in the plane sectional view of FIG. 6, the lower air supply pipe 25 is disposed with an inclination angle α in the clockwise direction with respect to the normal line R of the wall surface when viewed in the central axis direction of the combustion chamber 8. Yes. Thus, the combustion air guided from the lower air chamber 28a through the lower air supply pipe 25 is blown out from the opening on the combustion chamber 8 side into the combustion chamber 8 in a direction inclined with respect to the normal line R of the wall surface. Is done. In this way, the opening on the combustion chamber 8 side of the lower air supply pipe 25 functions as a first outlet.

  The upper air supply pipe 26 located on the first heat exchanging unit 3 side with respect to the lower air supply pipe 25 has a bottom surface of the combustion chamber 8 on the side facing the combustion chamber 8 with respect to the plane perpendicular to the central axis of the combustion chamber 8. It is inclined toward. As shown in the longitudinal sectional view of FIG. 5, the upper air supply pipe 26 is disposed at an inclination angle θ with respect to the axis-perpendicular direction line H of the combustion chamber 8, and is a plan sectional view of FIG. 7. As shown in FIG. 3, the combustion chamber 8 is disposed at an inclination angle β counterclockwise with respect to the normal line R of the wall surface as viewed in the central axis direction. The inclination angle β with respect to the normal line R of the wall surface of the upper air supply pipe 26 is opposite to the inclination angle α with respect to the normal line R of the wall surface of the lower air supply pipe 25 with respect to the normal direction of the wall surface. As a result, the combustion air guided from the upper air chamber 28b through the upper air supply pipe 26 is blown into the combustion chamber 8 in an inclined direction opposite to the lower air supply pipe 25 with respect to the normal R of the wall surface. . As described above, the opening on the combustion chamber 8 side of the upper air supply pipe 26 functions as a second outlet.

  FIG. 8 is a plan sectional view of the lower air chamber 28 a and the combustion chamber 8 at the position where the lower air supply pipe 25 is disposed. As shown in FIG. 8, the combustion air supplied through the lower air supply pipe 29a extending in parallel with one side of the lower air chamber 28a as indicated by the arrow A2 is indicated by the arrow A4 in the lower air chamber 28a. Turn counterclockwise as shown. This swirling combustion air is blown out in a clockwise eccentric direction with respect to the normal direction of the wall surface in a plane perpendicular to the central axis through a plurality of lower air supply pipes 25, 25,... . The combustion air blown out from the plurality of lower air supply pipes 25, 25,... Flows counterclockwise with respect to the central axis of the combustion chamber 8, as shown in FIG.

  FIG. 9 is a plan sectional view of the upper air chamber 28 b and the combustion chamber 8 at the position where the upper air supply pipe 26 is disposed. As shown in FIG. 9, the combustion air swirling counterclockwise as indicated by arrow A6 in the upper air chamber 28 passes through a plurality of upper air supply pipes 26, 26,... As indicated by arrow A7. On the bottom side, air is blown out in the counterclockwise eccentric direction with respect to the normal direction of the wall surface. The combustion air blown out from the plurality of upper air supply pipes 26, 26,... Flows clockwise with respect to the central axis of the combustion chamber 8 as shown in FIG.

  The combustion air blown counterclockwise through the lower air supply pipe 25 into the plane perpendicular to the axis collides with the combustion air blown clockwise through the upper air supply pipe 26 in the bottom direction, and the combustion chamber In the area surrounded by the lower air supply pipe 25 and the upper air supply pipe 26 in FIG. By forming the turbulence of the combustion air in the combustion chamber 8, the combustion air is effectively agitated in the combustion gas as compared with the case where only the swirl flow is formed in the combustion chamber 8 or the case where only the upward flow is formed. Can be mixed. Thus, combustion of unburned components of the combustion gas is promoted to raise the combustion temperature in the combustion chamber 8, and generation of carbon monoxide and soot can be reduced by completely burning the fuel. Therefore, it is possible to prevent the danger of carbon monoxide leaking and the disadvantage that soot accumulates in the heat exchanging units 3 and 4 and the heat exchanging ability is lowered.

  Here, the lower air supply pipe 25 eccentric in the clockwise direction with respect to the normal direction of the wall surface makes an obtuse angle with the swirling direction of the combustion air in the lower air chamber 28a, while being eccentric in the counterclockwise direction with respect to the normal direction of the wall surface. The upper air supply pipe 26 forms an acute angle with the swirling direction of the combustion air in the upper air chamber 28b. Thereby, since the flow rate of the combustion air blown out from the upper air supply pipe 26 is smaller than the flow rate of the combustion air blown out from the lower air supply pipe 25, the turbulence formed in the combustion chamber 8 is Combustion air that blows out in a right-angle plane turns predominantly counterclockwise as indicated by arrow A5. Further, an upward flow is generated in the combustion chamber 8 by the combustion air blown into the combustion chamber 8 from the through hole 11 of the bottom plate 10. Thereby, the combustion gas generated by the combustion of the fuel with the combustion air from the through hole 11 of the bottom plate 10 is turbulent by the combustion air from the upper air supply pipe 26 and the lower air supply pipe 25, and thus the upper part of the combustion chamber 8. Is effectively stirred and mixed with combustion air, combustion of unburned components is promoted, and fuel is completely burned. As a result, after the temperature of the combustion gas sufficiently rises, the combustion gas is guided from the combustion chamber 8 to the upper combustion gas chamber 35 through turbulent flow disturbance.

  Here, the inclination angle α with respect to the normal direction of the wall surface of the lower air supply pipe 25 that provides the first air outlet is greater than 0 ° and 50 ° or less, and preferably 1 ° or more and 30 ° or less. Moreover, the inclination | tilt angle (theta) with respect to the axis orthogonal plane of the upper stage air supply pipe | tube 26 which provides a 2nd blower outlet is larger than 0 degree and 50 degrees or less, Preferably, they are 1 degree or more and 30 degrees or less. In addition, the inclination angle β with respect to the normal direction of the wall surface of the upper air supply pipe 26 is greater than 0 ° and 50 ° or less, and preferably 1 ° or more and 30 ° or less.

  Although the lower combustion air supply pipe 25 and the upper air supply pipe 26 constitute the second combustion air supply section, the first combustion air supply pipe 126 constitutes the second combustion air supply section as shown in FIG. May be. As shown in the longitudinal sectional view of FIG. 10, the air supply pipe 126 is disposed at an inclination angle θ with respect to the axis-perpendicular direction line H of the combustion chamber 8, and in the plan sectional view of FIG. 11. As shown, the combustion chamber 8 is disposed so as to face the normal line R of the wall surface when viewed from the central axis direction. The combustion air blown out from the air supply pipe 126 toward the bottom side of the combustion chamber 8 collides with combustion gas traveling upward in the combustion chamber 8 to form turbulence. Thereby, the unburned component of combustion gas can be burned effectively effectively, and the temperature of combustion gas can be raised.

  Also, the two-stage air supply pipes 25 and 26 constituting the second combustion air supply section are such that the lower air supply pipe faces the plane perpendicular to the central axis and the upper stage air supply pipe is perpendicular to the central axis. However, the lower air supply pipe may be inclined toward the bottom surface of the combustion chamber 8 and the upper air supply pipe may be directed parallel to the plane perpendicular to the central axis. Alternatively, the lower air supply pipe may be inclined toward the ceiling side of the combustion chamber 8 and the upper air supply pipe may be directed parallel to the plane perpendicular to the central axis. In addition, the inclination direction of the second combustion air supply section in the lower air supply pipe 25 as viewed in the central axis direction is clockwise with respect to the normal line R of the wall surface, and the upper air supply pipe 26 is inclined in the direction of the central axis. Although it was counterclockwise with respect to the normal R of the wall surface, the inclination direction of the lower air supply pipe 25 in the central axis direction is counterclockwise, and the inclination direction of the upper air supply pipe 26 in the central axis direction is clockwise. It may be around.

  Further, the number of stages of air supply pipes installed in the upper part of the combustion chamber 8 can be appropriately set according to the flow to be formed in the combustion chamber 8. The number of stages of the air supply pipe may be any number other than two or one.

  Further, the combustion air outlet 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 8 or a plane passing through the central axis, or toward the normal direction of the wall surface, the inclined passage or the swirling passage. Can be formed.

  The first heat exchange unit 3 includes a rectangular parallelepiped combustion gas chamber 35 connected to the combustion chamber 8 of the combustion unit 2 and a water jacket 32 surrounding the combustion gas chamber 35. A space between the combustion gas chamber 35 and the water jacket 32 is defined by an inner wall 31, and an outside of the water jacket 32 is defined by an outer wall 30. The outer wall 30 is provided with a water supply pipe 33 through which water to be heated is supplied as indicated by an arrow W1 and led to the water jacket 32. The combustion gas chamber 35 is adjacent to the water chamber 42 of the second heat exchange unit 3 located above, and the bottom member 53 of the water chamber 42 also serves as the ceiling member of the combustion gas chamber 35.

  The high-temperature combustion gas generated in the combustion chamber 8 of the combustion unit 2 flows into the combustion gas chamber 35 connected to the combustion chamber 8 and exchanges heat with the water in the water jacket 32. The water in the water jacket 32 is guided to the second heat exchange unit 4 after the temperature rises due to heat exchange with the combustion gas in the combustion gas chamber 35. The combustion gas in the combustion gas chamber 35 exchanges heat with the water in the water jacket 32 and also passes through the bottom member 53 of the water chamber 42 of the second heat exchange unit 4 that also serves as the ceiling member of the combustion gas chamber 35. Heat exchange is performed with water in the water chamber 42 of the exchange unit 4. The combustion gas that has flowed through the combustion gas chamber 35 flows into the first smoke chamber 45 of the second heat exchange unit 4. In the heat exchanger integrated combustion furnace 1 of the present embodiment, a combustion gas chamber 35 is connected to the combustion chamber 8, a water jacket 32 surrounding the combustion gas chamber 35 is provided, and heat exchange is performed with the water jacket 32. Combustion gas is supplied to the second heat exchanging unit 4 which is a multitubular water heat exchanger. Therefore, the combustion temperature of the combustion chamber 8 can be increased by about 100 ° C. as compared with the case where the combustion gas is directly supplied from the combustion chamber 8 to the multitubular water heat exchanger. Therefore, it is not necessary to supply surplus combustion air for lowering the temperature to the combustion chamber 8, so that the fuel combustion efficiency can be increased.

  The second heat exchanging unit 4 has a substantially rectangular parallelepiped casing 40 whose dimension in the width direction (left and right direction on the paper surface in FIG. 1) is larger than that in the depth direction (left and right direction on the paper surface in FIG. 2). Water chamber partition plates 41, 41 arranged on both left and right sides in the width direction and serving as tube plates, water chambers 42 formed between the left and right water chamber partition plates 41, 41 in the casing 40, and water chamber partition plates A plurality of smoke pipes 43, 43,... Supported by 41, 41 and disposed in the water chamber 42, and two flow path partition plates 44, 44 that divide the water chamber 42 and meander the flow of water. Have. A first smoke chamber 45 and a third smoke chamber 47 connected to the smoke pipe 43 supported by the water chamber partition plate 41 are provided on the opposite side of the water chamber partition plate 41 of the left water chamber partition plate 41 in a front view. Yes. A second smoke chamber 46 and a gas discharge port 53 are provided on the opposite side of the water chamber partition plate 41 on the right side in the front view. On the surfaces of the first smoke chamber 45, the second smoke chamber 46, and the third smoke chamber 47, a heat insulating material 48 and a castable refractory 49 are provided. As the heat insulating material 48, for example, one formed of a ceramic board can be used, and as the castable refractory 49, for example, one formed of alumina concrete can be used.

  Among the plurality of smoke pipes 43, 43, a plurality of first path smoke pipes 43a, 43a,... Are connected between the first smoke chamber 45 and the second smoke chamber 46. Between the second smoke chamber 46 and the third smoke chamber 47, a plurality of second path smoke tubes 43b, 43b,. Between the third smoke chamber 47 and the gas discharge port 53, a plurality of third path smoke tubes 43c, 43c,. The first smoke chamber 45 communicates with the combustion gas chamber 35 of the first heat exchange unit 3 and the combustion gas in the combustion gas chamber 35 is guided. The combustion gas guided to the first smoke chamber 45 flows through the first path smoke pipes 43a, 43a,..., Is guided to the second smoke chamber 46, and the combustion gas guided to the second smoke chamber 46 is The combustion gas guided to the third smoke chamber 47 flows through the two-pass smoke tubes 43b, 43b,..., And the combustion gas guided to the third smoke chamber 47 flows through the third-pass smoke tubes 43c, 43c,. It is guided to the discharge port 53 and discharged from the gas discharge port 53 to the outside. Thus, the 2nd heat exchange part 4 comprises the 3 pass heat exchanger with which combustion gas flows in three directions. The second heat exchanging unit 4 may constitute a two-pass heat exchanger in which the combustion gas flows in two directions, and the number of passes can be appropriately set according to the required capacity.

  As shown in FIG. 2, the water chamber 42 of the second heat exchange unit 4 communicates with the water jacket 32 of the first heat exchange unit 3 via the connecting pipe 50. The communication pipe 50 has one end connected to the upper part of the water jacket 32 of the first heat exchange unit 3 and the other end connected to the inlet 51 of the lower part of the water chamber 42 of the second heat exchange unit 4. The water subjected to heat exchange in the water jacket 32 of the first heat exchange unit 3 passes through the connecting pipe 50 and flows into the water chamber 42 of the second heat exchange unit 4 from the inflow port 51 as indicated by an arrow W2. The water that has flowed into the water chamber 42 passes through the smoke pipes 43, 43,... In a meandering manner as it flows through the flow paths partitioned by the flow path partition plates 44, 44 as indicated by arrows W3, W4. Exchange heat with. The water heated by the heat exchange flows out of the water chamber 42 through the outlet 52 of the water chamber 42 and is discharged to the outside through the outlet pipe 54 connected to the outlet 52. An air release port (not shown) is provided at the upper end of the casing 40 so that excessive pressure is not applied in the water chamber 42.

  The combustion part 2 and the first heat exchange part 3 are formed in a rectangular parallelepiped having substantially the same cross section, and the second heat exchange part 4 has a slightly larger dimension in the depth direction than the dimension of the first heat exchange part 3, And the dimension of the width direction is formed in the rectangular parallelepiped shape about 1.5 times the dimension of the 1st heat exchange part 3. The combustion unit 2, the first heat exchange unit 3, and the second heat exchange unit 4 are arranged so as to be successively connected from the lower side to the upper side in the vertical direction. Thereby, the heat exchanger integrated combustion furnace 1 can be installed in a smaller space than that in which the combustion part and the heat exchange part are separately formed.

  Drawing 12 is a mimetic diagram showing the boiler device constituted using heat exchanger integrated combustion furnace 1 of an embodiment. The boiler apparatus includes a heat exchanger integrated combustion furnace 1, a hot water storage tank 68 that stores high-temperature water heated in the heat exchanger integrated combustion furnace 1, and a combustion exhausted from the heat exchanger integrated combustion furnace 1. A cyclone dust collector 74 that collects exhaust gas, which is a gas, and an induction fan 75 connected to the exhaust port of the cyclone dust collector 74 are provided.

  In order to prevent backfire from the combustion chamber 8 of the combustion unit 2 in the combustion unit 2 of the heat exchanger integrated combustion furnace 1, the wood chips as fuel are unwound from the supply conveyor 61 of the metering feeder 60. Is supplied to the screw conveyor 17 through the shut-off valve 62. The fixed amount feeder 60 has a hopper with a built-in stirring blade. The stirring blade is disposed above the supply conveyor 61 in the hopper, and is rotationally driven by a driving means installed on the side portion of the metering feeder 60 to agitate the wood chip of fuel to prevent the formation of a bridge. The hopper of the fixed amount feeder 60 is provided with a level sensor L1 that detects the remaining amount by detecting the surface position of the stored fuel. The screw conveyor 17 is provided with a temperature sensor T1 and monitors whether the fuel conveyed by the screw conveyor 17 is ignited by the high-temperature air from the combustion chamber 8 based on the temperature detected by the temperature sensor T1. . When the temperature sensor T1 detects an abnormal temperature and detects the ignition of fuel, the open / close valve V1 of the water supply pipe connected to the screw conveyor 17 is opened to extinguish the fire.

  The temperature of the combustion gas sent from the combustion chamber 8 to the first heat exchange unit 3 is detected by a gas temperature sensor T <b> 2 disposed in the first smoke chamber 45.

  The water chamber 42 of the second heat exchange unit 4 is provided with a water level sensor L3 that detects the amount of water inside and a temperature sensor T3 that detects the temperature of the water. The hot water storage tank 68 is provided with a temperature sensor T4 for detecting the temperature of stored water and a water level sensor L2 for detecting the amount of water inside.

  The hot water storage tank 68 is connected to a heating return pipe 71 extending from the water chamber 42 of the second heat exchange unit 4 and a heating feed pipe 70 interposed in the circulation pump 69 and extending to the water jacket 32 of the first heat exchange unit 3. ing. The water jacket 32 of the first heat exchange unit 3, the water chamber 42 of the second heat exchange unit 4, and the hot water storage tank 68 constitute a water circulation path. On this circulation path, a temperature sensor T5 that measures the inlet temperature of the hot water is provided in the heating feed pipe 70, and a temperature sensor T6 that measures the outlet temperature of the hot water is provided in the heating return pipe 71. Based on the detected values of the gas temperature sensor T2 in the first smoke chamber 45 and the temperature sensors T5 and T6 in the heating feed pipe 70 and the heating return pipe 71, the supply amounts of combustion air and fuel are controlled.

  The cyclone dust collecting device 74 includes a cylindrical portion having a combustion gas suction port on a side surface, an inverted conical separation portion that forms a swirling flow inside the cylindrical portion, and an upward portion from the inside of the cylindrical portion. It has an exhaust pipe arranged so as to protrude. The cyclone dust collector 74 sucks the combustion gas that has undergone heat exchange in the second heat exchange unit 4 from the suction port of the cylindrical part, and forms a swirling flow of the combustion gas between the cylindrical part and the separation part. The dust contained in the combustion gas is separated by the centrifugal force. The combustion gas from which the dust has been separated is sucked into the induction fan 75 and released to the atmosphere. As the induction fan 75, a centrifugal blower can be used.

  This boiler device is based on the detection information of the level sensor L1, temperature sensor T1, gas temperature sensor T2, water level sensors L2, L3 and temperature sensors T3, T4, supply conveyor 61, shutoff valve 62, screw conveyor 17, open / close The control part 80 which controls operation | movement of the valve | bulb V1, the induction fan 75, and the air blower 64 is provided. By this control unit 80, the amount of heat generated in the combustion chamber 8, the water jacket 32 of the first heat exchange unit 3, and the water chamber 42 of the second heat exchange unit 4 so that the temperature of the hot water storage tank 68 becomes a predetermined temperature. And the circulation amount of water in the hot water storage tank 68 is controlled.

  The heat exchanger integrated combustion furnace 1 and the boiler apparatus having the above-described configuration operate as follows. First, the water levels in the water chamber 42 and the hot water storage tank 68 are confirmed based on the detection information of the water level sensors L2 and L3. When the water level in the water chamber 42 and the hot water storage tank 68 is lower than the reference value, water is supplied to the hot water storage tank 68. When the water level in the water chamber 42 and the hot water storage tank 68 satisfies the reference value, the induction fan 75 and the blower 64 are started, and the shutoff valve 62 is opened to start the supply conveyor 61 and the screw conveyor 17. The blower 64 is activated to supply combustion air to the lower air chamber 28a and the upper air chamber 28b through the lower air supply pipe 29a and the upper air supply pipe 29b, and supply combustion air to the bottom air chamber 13 through the lower air supply pipe 15. To do. In FIG. 12, the lower air supply pipe 29 a and the upper air supply pipe 29 b are collectively indicated by reference numeral 29, and the lower air chamber 28 a and the upper air chamber 28 b are collectively indicated by reference numeral 28. The shutoff valve 62 is opened, the supply conveyor 61 and the screw conveyor 17 are started, the wood chips of fuel are unwound from the fixed supply machine 60 by the supply conveyor 61, and the fuel is introduced into the combustion chamber 8 by the screw conveyor 17.

  In the heat exchanger integrated combustion furnace 1, the combustion air supplied to the lower air chamber 28 a and the upper air chamber 28 b is supplied to the combustion chamber 8 through the lower air supply pipe 25 and the upper air supply pipe 26. At this time, the combustion air blown out from the lower air supply pipe 25 in a plane perpendicular to the central axis of the combustion chamber 8 and in the eccentric direction of the central axis, and the center from the upper air supply pipe 26 to the bottom of the combustion chamber 8 Combustion air turbulence is formed in the upper part of the combustion chamber 8 by mixing the lower air supply pipe 25 with respect to the shaft and the combustion air blown in the eccentric direction opposite to the axis. As indicated by the arrow F, the fuel supplied by the screw conveyor 17 is supplied into the combustion chamber 8 from the fuel supply port 21 located in the lower part of the region where the disturbance is formed, and the injected fuel is supplied to the combustion chamber 8. The bottom plate 10 is held.

  The fuel held on the bottom plate 10 is ignited by a burner (not shown) that operates with petroleum fuel, and the primary combustion air supplied from the bottom air chamber 13 through the through holes 11, 11,. Then, the secondary combustion air supplied from the lower air chamber 28a and the upper air chamber 28b through the lower air supply pipe 25 and the upper air supply pipe 26 is received to start combustion. Combustion gas generated with the combustion of the fuel flows in a swirling manner in the combustion gas chamber 35 of the first heat exchange unit 3 from above the region where the turbulent flow in the combustion chamber 8 is generated. In the course of combustion, the combustion gas accompanying combustion forms a turbulent flow and a swirling flow in the combustion chamber 8, and the combustion air is sufficiently supplied from the through-hole 11 and the air supply pipes 25 and 26 to be stirred and mixed. Therefore, it burns completely and becomes high temperature. Accordingly, a high-temperature combustion gas can be stably obtained while using a wood chip that is a biomass fuel. The combustion gas generated by burning the fuel in the combustion chamber 8 flows into the combustion gas chamber 35 of the first heat exchange unit 3.

  The combustion gas that has flowed into the combustion gas chamber 35 exchanges heat with the water in the water jacket 32, and passes through the bottom member 53 of the water chamber 42 of the second heat exchange unit 4 that also serves as the ceiling member of the combustion gas chamber 35. Heat exchange is performed with water in the water chamber 42 of the second heat exchange unit 4. The combustion gas that has exchanged heat with the water in the water jacket 32 and the water in the water chamber 42 in the combustion gas chamber 35 flows into the first smoke chamber 45 of the second heat exchange unit 4.

  The combustion gas that has flowed into the first smoke chamber 45 of the second heat exchange unit 4 is guided to the second smoke chamber 46 through the first path smoke tubes 43a, 43a,..., And the second path smoke tubes 43b, 43b,. Are led to the third smoke chamber 47, and further led to the gas discharge port 53 through the third path smoke pipes 43c, 43c,. Heat exchange with water in the water chamber 42 while passing through the first path smoke pipes 43a, 43a, ..., the second path smoke pipes 43b, 43b, ... and the third path smoke pipes 43c, 43c, ... I do. The combustion gas that has reached the gas discharge port 53 is guided to the cyclone dust collector 74. In the cyclone dust collector 74, the combustion gas flowing in from the suction port of the cylindrical portion is guided to the separation portion, and the dust is separated by centrifugal force when flowing in the separation portion in a swirling manner. The dust separated from the combustion gas is collected in a dust container disposed at the lower part of the cyclone dust collector. The combustion gas from which the dust has been separated passes through the exhaust pipe, is sucked into the induction fan 75 through the exhaust pipe connected to the exhaust tower, and is exhausted to the atmosphere. A bag filter for removing fine particles contained in the combustion gas may be connected to the downstream side of the attracting fan 75.

  The water in the hot water storage tank 68 is sent to the water jacket 32 of the heat exchanger integrated combustion furnace 1 through the heating feed pipe 70 by the circulation pump 69. The water heated by receiving heat transmitted from the combustion gas chamber 35 in the water jacket 32 is guided to the water chamber 42 of the second heat exchange section 4 through the connecting pipe 50, and exchanges heat with the combustion gas in the water chamber 42. And then heated further. The water heated in the water chamber 42 is returned to the hot water storage tank 68 through the heating return pipe 71 connected to the outflow pipe 54.

  Based on the temperature of the combustion gas detected by the gas temperature sensor T2 and the inlet temperature and outlet temperature of the hot water detected by the temperature sensors T5 and T6, the control unit 80 supplies the supply conveyor 61, the shut-off valve 62, and the screw conveyor 17. Are controlled to control the amount of fuel supplied to the combustion chamber 8, and control the operation of the induction fan 75 and the blower 64 to control the amount of combustion air supplied to the combustion chamber 8. When the inlet temperature of the hot water is lower than the reference value, the control unit 80 controls the combustion mode that increases the temperature of the water. That is, the shutoff valve 62 is opened to increase the amount of fuel supplied by the supply conveyor 61 and the screw conveyor 17 and increase the amount of air blown from the blower 64 to increase the amount of combustion air supplied to the combustion chamber 8. Further, the suction amount of the attracting fan 75 is increased to increase the amount of combustion gas sucked from the second heat exchange unit 4 of the cyclone dust collector 74. As a result, the amount of heat generated by burning the fuel in the combustion chamber 8 increases, the amount of heat exchanged with water in the water jacket 32 and the water chamber 42 increases, the temperature of the circulating water rises, and the inlet The temperature rises. Here, it is confirmed whether or not the temperature of the combustion gas in the first smoke chamber 45 detected by the gas temperature sensor T2 has reached an abnormally high temperature, and the outlet from the second heat exchange unit 4 detected by the temperature sensor T6. Check if the temperature has reached an abnormally high temperature. When the inlet temperature detected by the temperature sensor T5 reaches a predetermined temperature, the control unit 80 reduces the amount of fuel supplied by the supply conveyor 61 and the screw conveyor 17 and decreases the amount of air blown by the blower 64, thereby reducing the combustion chamber 8. The amount of combustion air supplied to the second heat exchanger 4 is reduced by reducing the amount of combustion air supplied to the intake air, the amount of suction of the induction fan 75 is reduced, and the amount of water supplied to the circulation pump 69 is reduced. When the supply of fuel from the supply conveyor 61 to the screw conveyor 17 is stopped, the shutoff valve 62 is closed to prevent the backflow of combustion gas and combustion air from the combustion chamber 8.

  When the heating operation of water by the first heat exchange unit 3 and the second heat exchange unit 4 is stopped because the use of hot water is stopped, the control unit 80 stops the control of the combustion mode and controls the standby mode. I do. That is, the fuel supply amount by the supply conveyor 61 and the screw conveyor 17 is made smaller than that in the combustion mode, and the suction amount of the induction fan 75 and the blower amount of the blower 64 are made smaller than in the combustion mode. As a result, in the state where the supply of heat to the first heat exchange unit 3 and the second heat exchange unit 4 is substantially stopped, the combustion chamber 8 holds the seed fire. In this way, by holding a minimum amount of fuel on the bottom plate 10 facing the combustion chamber 8 and leaving a seed flame in this fuel, the use of hot water is resumed and the first heat exchange unit 3 and the second heat exchange unit 4, if the amount of fuel supplied by the supply conveyor 61 and the screw conveyor 17 and the amount of air blown by the blower 64 are increased, the amount of heat generated by quickly igniting the fuel and generating in the combustion chamber 8 can be quickly increased. Can be recovered. 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 fuel supply by the supply conveyor 61 and the screw conveyor 17 may be performed continuously or intermittently. In short, it is only necessary to be able to supply fuel that can hold the seed fire.

  In the above embodiment, the fuel made of wood chips is used as the biomass fuel. However, a regenerated fuel obtained by molding a plant material such as wood pellets may be used. 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. In addition, plant-based recycled fuel is made by mixing plant-based materials such as plastic with non-plant-based materials such as RPF (Refuse Paper and Plastic Fuel). The prepared fuel may be used.

DESCRIPTION OF SYMBOLS 1 Heat exchanger integrated combustion furnace 2 Combustion part 3 1st heat exchange part 4 2nd heat exchange part 8 Combustion chamber 10 Bottom plate 11 Bottom plate through-hole 13 Bottom air chamber 17 Screw conveyor 25 Lower air supply pipe 26 Upper air Supply pipe 28a Lower air chamber 28b Upper air chamber 32 Water jacket 35 Combustion gas chamber 42 Water chamber 43a First path smoke pipe 43b Second path smoke pipe 43c Third path smoke pipe

Claims (9)

A combustion chamber;
A fuel supply section for supplying fuel to the combustion chamber;
A first combustion air supply unit for supplying combustion air to a lower portion of the combustion chamber;
A second combustion air supply section for supplying combustion air to the upper portion of the combustion chamber so as to disturb the flow of combustion gas directed upward in the combustion chamber;
A combustion gas chamber that is connected to the upper side of the combustion chamber and from which the combustion gas is led, and a water jacket that is disposed so as to surround the combustion gas chamber and is supplied with water that exchanges heat with the combustion gas. A first heat exchange section;
The water exchanged by the water jacket is guided, the water chamber is arranged adjacent to the combustion gas chamber of the first heat exchange unit, and the water chamber is arranged in the water chamber, and the combustion of the first heat exchange unit A heat exchanger-integrated combustion furnace comprising: a second heat exchange section having a smoke pipe through which combustion gas guided from a gas chamber flows. In the heat exchanger integrated combustion furnace according to claim 1,
The second combustion air supply section has a plurality of outlets that are arranged on the wall surface of the combustion chamber and blow out combustion air in a direction inclined toward the bottom side of the combustion chamber. Integrated combustion furnace. The heat exchanger integrated combustion furnace according to claim 1 or 2,
The second combustion air supply unit is
A plurality of first air outlets arranged on the wall surface of the combustion chamber and for blowing combustion air in a direction inclined with respect to the normal line of the wall surface in a plane perpendicular to the axis of the combustion chamber;
A direction that is arranged on the wall surface of the combustion chamber on a side farther from the bottom of the combustion chamber than the first outlet and is inclined toward the bottom side of the combustion chamber, and a normal line of the wall surface of the combustion chamber On the other hand, a heat exchanger integrated combustion furnace comprising a plurality of second outlets for blowing combustion air in a direction inclined to the opposite side to the first outlet. In the heat exchanger integrated combustion furnace according to claim 3,
The second combustion air supply unit is disposed so as to surround the outside of the combustion chamber and communicates with the first air outlet, and the first air outlet is directed to a normal of a wall surface that blows combustion air into the combustion chamber. A heat exchanger-integrated combustion furnace comprising an air chamber for swirling combustion air in the same direction as the inclination direction. The heat exchanger integrated combustion furnace according to any one of claims 1 to 4,
The heat exchanger integrated combustion furnace, wherein the fuel supply unit has a fuel supply port provided in a wall surface of the combustion chamber. The heat exchanger integrated combustion furnace according to any one of claims 1 to 5,
The heat exchanger integrated combustion furnace, wherein the first combustion air supply section has a bottom outlet for supplying combustion air upward from the bottom of the combustion chamber. The heat exchanger integrated combustion furnace according to any one of claims 1 to 6,
The heat exchanger integrated combustion, wherein the bottom member forming the bottom of the water chamber of the second heat exchange portion also serves as the ceiling member forming the ceiling of the combustion gas chamber of the first heat exchange portion Furnace. The heat exchanger integrated combustion furnace according to any one of claims 1 to 7,
The heat exchanger integrated combustion furnace, wherein the second heat exchange part is a three-pass multi-tube heat exchanger. The heat exchanger integrated combustion furnace according to any one of claims 1 to 8,
A control unit that controls the fuel supply unit and a blower that supplies combustion air to the combustion chamber;
The control unit controls a fuel supply amount by the fuel supply unit and a blown amount by the blower to adjust a heat amount to be generated in the combustion chamber, a fuel supply amount by the fuel supply unit, and the blower A heat exchanger integrated combustion furnace, characterized by having a standby mode in which the amount of blown air is controlled to a smaller amount than in the combustion mode and the seed chamber is held in the combustion chamber.

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