JP2017078551A - Solid fuel combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily relate swirling airflow to improvement of the combustion efficiency.SOLUTION: A cylindrical partition wall 101 divides an interior part of a combustion chamber 5 into an interior space 5a and an exterior space 5b. A net which enables communication between the interior space 5a and the exterior space 5b is formed in the cylindrical partition wall 101. A solid fuel is supplied to the interior space 5a by a fuel supply part 160. An inflammable gas is generated from the solid fuel. An air supply pipe 153 flows out air to generate swirling airflow around the cylindrical partition wall 101. The swirling airflow causes an unburnt inflammable gas in the interior space 5a to flow out to the exterior space 5b through the net of the cylindrical partition wall 101 and join to the swirling airflow.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solid fuel combustion apparatus.

  Patent Documents 1 and 2 are examples of techniques aimed at improving combustion efficiency by forming a swirling airflow when burning fuel.

JP 2010-139167 A JP 57-19504 A

  In both Patent Documents 1 and 2, a swirling airflow formed in a wide space above the combustion chamber is used for combustion. In such a wide space, the swirling airflow may not be formed properly. Therefore, even if the swirling airflow formed in the space is used for combustion, there is a possibility that the combustion efficiency is not improved.

  An object of the present invention is to provide a solid fuel combustion apparatus in which a swirling airflow is easily connected to an improvement in combustion efficiency.

  The solid fuel combustion apparatus according to the present invention includes a combustion section in which a combustion chamber is formed, a partition wall that divides the space in the combustion chamber into an outer space and an inner space in the horizontal direction, and supplies the solid fuel into the combustion chamber. A fuel supply section, a gas supply section for supplying a gas containing oxygen for combustion into the combustion chamber, and an airflow forming section for generating an airflow in the combustion chamber, wherein the partition wall includes the inner wall A communication part is formed for communicating the space and the outer space, and the fuel supply part is configured to supply the solid fuel to a region inside the inner space and inside the communication part, An unburned gas generated from the solid fuel in the inner space flows out through the communication portion to a region horizontally sandwiched between the partition wall and the inner wall surface of the combustion chamber in the outer space. The airflow shape Part is to generate a swirling airflow swirling around the partition wall in the region.

  According to the solid fuel combustion apparatus of the present invention, the swirling airflow is generated in the region horizontally sandwiched between the partition wall and the inner wall surface of the combustion chamber. Therefore, since the swirling airflow is generated in a limited region between the partition wall and the inner wall surface of the combustion chamber, the swirling airflow is easily formed reliably. Further, in the present invention, the above-described region in which unburned gas generated from the solid fuel supplied to the region inside the communication portion in the inner space is sandwiched between the partition wall and the inner wall surface of the combustion chamber through the communication portion. A swirling airflow is formed so as to flow out into the air. That is, the unburned gas generated from the solid fuel in the inner space flows outward toward the communicating portion and easily joins the swirling airflow outside the partition wall as it is. Therefore, the gas that has not been burned in the inner space is efficiently burned while being entrained in a swirling airflow that is appropriately formed in a limited region of the outer space.

  On the other hand, in both Patent Documents 1 and 2, the airflow from the fuel is merged with the swirling airflow formed in a wide space above the combustion chamber. There is a possibility that the swirling airflow is not properly formed in a wide space, and it is difficult to improve the combustion efficiency even if unburned gas or the like is joined to the swirling airflow formed in such a space. Further, according to Patent Document 2, the airflow from the fuel is once directed to the inside of the combustion chamber, passed through the supply cylinder disposed in the center of the combustion chamber, and directed to the upper swirling airflow from the hole at the upper end of the supply cylinder. Dodge. Therefore, Patent Document 2 is also completely different from the present invention in which the unburned gas generated from the solid fuel in the inner space is directly directed to the outer communication portion and joined to the swirling airflow outside the partition wall through the communication portion.

It is sectional drawing which shows schematic structure of the boiler which concerns on one Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is an enlarged view of the internal combustion part of FIG. 1, and its periphery structure. FIG. 4A is a perspective view of a cylindrical partition wall and a frame. FIG. 4B is a sectional view taken along line IVB-IVB in FIG. FIG. 5A is an enlarged front view of the cylindrical partition wall. FIG. 4B is a cross-sectional view taken along the line VB-VB in FIG. It is a modification of a cylindrical partition, Comprising: It is a figure corresponding to FIG.4 (b). Each of FIG. 7A to FIG. 7C is another modified example of the cylindrical partition wall, and corresponds to FIG. It is a modification of an air supply pipe | tube, Comprising: It is a figure corresponding to the partially expanded view of FIG.

  A boiler 1 (solid fuel combustion apparatus) according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the boiler 1 includes an outer wall 2 in which a space is formed, and partition walls 6, 7, and 8 that partition the space in the outer wall 2 in the vertical direction. A space in the outer wall 2 is partitioned into an exhaust chamber 3, a heating chamber 4, a combustion chamber 5, and an air supply chamber 151 in order from the top by partition walls 6, 7 and 8. The combustion chamber 5 is a space in which solid fuel burns. In the boiler 1, the lower half in which the combustion chamber 5 is formed is a combustion portion in the present invention. The air supply chamber 151 is a space into which air supplied to the combustion chamber 5 flows. Details of the combustion chamber 5 and the air supply chamber 151 will be described later.

  On the other hand, the upper half of the boiler 1 in which the heating chamber 4 is formed is a heating unit that heats water supplied from the outside. A plurality of vent pipes 11 are provided in the heating chamber 4. The vent pipe 11 is formed of a material having high thermal conductivity, for example, a metal material. The ventilation pipe 11 penetrates the heating chamber 4 in the vertical direction. The upper end portion and the lower end portion of the vent pipe 11 pass through the partition walls 6 and 7, respectively, and protrude into the combustion chamber 5 and the exhaust chamber 3. The upper end and the lower end of the vent pipe 11 are open. The air in the combustion chamber 5 that has become high temperature due to the combustion of fuel flows into the vent pipe 11 from the opening at the lower end, moves upward through the vent pipe 11, and flows out from the opening at the upper end to the exhaust chamber 3. In the heating chamber 4, water conduits 12 and 13 are provided. When the inside of the heating chamber 4 is filled with water by allowing water (cold water) to flow into the water conduit 12 from the outside, when the high-temperature air from the combustion chamber 5 passes through the inside of the vent tube 11, the vent tube By transferring heat to water through 11, the water in the heating chamber 4 is heated. The water heated to a high temperature can be taken out from the water conduit 13 to the outside. An exhaust pipe 14 is provided in the exhaust chamber 3. The exhaust pipe 14 communicates with the exhaust part 21. The exhaust unit 21 is provided with suction means for sucking air. Air from the combustion chamber 5 that has flowed into the exhaust chamber 3 through the vent pipe 11 is sucked from the exhaust chamber 3 through the exhaust pipe 14 by suction means provided in the exhaust section 21. The sucked air is subjected to a purification process such as soot removal in the exhaust unit 21 and then discharged into the atmosphere.

  The combustion chamber 5 is a space defined by an inner wall surface 2 a having a substantially cylindrical shape formed in the outer wall 2, a lower surface of the partition wall 7, and an upper surface of the partition wall 8. The boiler 1 is provided with an air supply unit 150 (gas supply unit) that supplies combustion air to the combustion chamber 5. The air supply unit 150 is provided at the supply chamber 151, supply tubes 152 and 153 (second supply unit) extending upward from the supply chamber 151 to the combustion chamber 5, and the bottom of the combustion chamber 5. An air supply unit 155, an air supply pipe 156 (first air supply part) extending upward from the air supply part 155, and a blower 157 that sends air into the air supply chamber 151 through the ventilation pipe 158. ing.

  The air supply chamber 151 is a space formed at the lowermost portion in the outer wall 2 and separated from the combustion chamber 5 by the partition wall 8. A lower end portion of the air supply pipe 152 is opened in the air supply chamber 151. As shown in FIGS. 1 and 3, the air supply pipe 152 passes through the partition wall 8 toward the combustion chamber 5. The upper end portion of the air supply pipe 152 opens upward near the bottom portion of the combustion chamber 5. The air supplied into the supply chamber 151 by the blower 157 flows into the combustion chamber 5 through the supply tube 152. An air supply part 155 having a lid shape is fixed to the bottom of the combustion chamber 5 so as to cover the upper end opening of the air supply pipe 152. An air supply chamber 155 a is formed between the air supply unit 155 and the partition wall 8. A plurality of through-holes 155 b are formed in the ceiling plate of the air supply unit 155.

  Further, the lower end portion of the air supply pipe 156 is opened in the air supply chamber 155a. The air supply pipe 156 extends upward through the ceiling plate of the air supply unit 155. As shown in FIG. 2, five supply pipes 156 are arranged so as to surround the center of the combustion chamber 5 in a plan view. As shown in FIG. 3, the air supply pipe 156 is formed with a plurality of through holes 156a arranged along the vertical direction. The air in the air supply chamber 155a is supplied to the upper side of the air supply unit 155 through the through hole 155b, and is supplied to the upper side of the air supply unit 155 through the air supply pipe 156 and through the through hole 156a. Note that the air supply unit 155 and the air supply pipe 156 are both disposed in the inner space 5a in the cylindrical partition wall 101 as described later. Therefore, the air supplied from the air supply unit 155 is mainly used for combustion in the inner space 5a.

  Further, the lower end portion of the air supply pipe 153 is opened in the air supply chamber 151. As shown in FIGS. 1 to 3, three supply pipes 153 are provided so as to be partially embedded in the recess 2 b provided in the inner wall surface 2 a of the combustion chamber 5. Each air supply pipe 153 penetrates the partition wall 8 from the air supply chamber 151 and extends vertically upward along the recess 2b. The air in the supply chamber 151 flows upward in the supply pipe 153. As shown in FIG. 2, the three air supply pipes 153 are arranged at equal intervals in the direction along the inner wall surface 2a. As shown in FIG. 1, the air supply pipe 153 is formed with a plurality of through holes 153 a arranged along the vertical direction. The opening (outlet) of each through hole 153a is formed so that the air flowing through the air supply pipe 153 flows out from the air supply pipe 153 through the through hole 153a in the directions A1 to A3 (predetermined direction) in FIG. . As shown in FIG. 2, each of the A1 to A3 directions has a direction component orthogonal to the direction from the supply pipe 153 toward the center of the combustion chamber 5 in a plan view. In addition, the component corresponds to a component that rotates counterclockwise around the center of the combustion chamber 5 in a plan view in any of the directions A1 to A3. Thereby, a swirling airflow is generated in the combustion chamber 5 in the direction B of FIG. The swirling airflow is an airflow that flows so as to swirl around the center of the combustion chamber 5. This whirling airflow is formed between the inner wall surface 2a of the combustion chamber 5 and the outer surface of a cylindrical partition wall 101 described later. As described above, the air supply unit 150 of the present embodiment has a function of supplying air into the combustion chamber 5 and generating a swirling airflow in the combustion chamber 5. That is, the air supply unit 150 corresponds to both the gas supply unit and the airflow forming unit of the present invention.

  The boiler 1 is provided with a fuel supply unit 160 that supplies solid fuel to the combustion chamber 5. The solid fuel of the present embodiment is made of a so-called foamed polystyrene (polystyrene) waste material formed into a pellet. In addition to polystyrene, waste material of foamed material of polyethylene or polypropylene may be used as a solid fuel in which pellets are formed into pellets. The raw material may not be a foam material. Further, solid fuel that has not been pelletized, for example, only waste material that has been finely crushed may be used.

  The fuel supply unit 160 has a so-called screw conveyor type transport unit as a solid fuel transport unit. As shown in FIG. 1, the fuel supply unit 160 includes a cylindrical part 161, a helical tooth 162 provided in the cylindrical part 161, a rotating shaft 163 to which the helical tooth 162 is fixed, and a motor that rotates the rotating shaft 163. 164. The cylindrical portion 161 passes through the outer wall 2 in the horizontal direction from the outside of the outer wall 2 to the combustion chamber 5. An end portion of the cylindrical portion 161 disposed outside the outer wall 2 opens upward. From this opening, the solid fuel stored in the hopper 22 is introduced into the cylindrical portion 161. As the motor 164 rotates the rotating shaft 163, the solid fuel charged into the cylindrical portion 161 is conveyed to the left in FIG. 1 by the helical teeth 162. Then, the conveyed solid fuel is pushed out of the cylindrical portion 161 at the tip portion disposed in the combustion chamber 5 in the cylindrical portion 161 and falls in the combustion chamber 5. In addition, the front-end | tip part of the cylindrical part 161 is arrange | positioned in the inner space 5a in the cylindrical partition 101 as mentioned later. Therefore, the solid fuel pushed out from the tip of the cylindrical portion 161 falls in the inner space 5a.

  In the combustion chamber 5, an internal combustion unit 100 to which solid fuel is supplied from the fuel supply unit 160 is provided. The fuel supply unit 160 penetrates the side wall of the internal combustion unit 100 in the horizontal direction, and the tip thereof is disposed inside the internal combustion unit 100. Although the whole internal combustion part 100 is comprised with the metal material, it may be made from other materials with high heat resistance, such as ceramics. Moreover, you may be comprised from these multiple types of materials. As shown in FIGS. 3 and 4A, the internal combustion unit 100 includes a cylindrical partition wall 101 having a cylindrical shape, a frame 110 that supports the cylindrical partition wall 101, and a disk-shaped lid 120. ing. The frame 110 includes four column members 111 extending in the vertical direction and ring members 112 and 113 extending in the horizontal direction. The ring members 112 and 113 are spaced apart in the vertical direction. The lid 120 is supported on the upper end of the frame 110. The lid 120 has substantially the same shape and the same size as the ring member 112 in plan view, and substantially overlaps the entire ring member 112 (see FIG. 2).

  The cylindrical partition wall 101 makes one round inside the four column members 111 and is fixed to each column member 111. The cylindrical partition wall 101 extends in the vertical direction from the ring member 112 to the ring member 113. As shown in FIG. 4B, the cylindrical partition wall 101 is closed along a circle in plan view.

  The cylindrical partition wall 101 is manufactured by curving expanded metal and forming it into a cylindrical shape. As shown in FIGS. 5A and 5B, the expanded metal is configured by connecting a plurality of bonds arranged in a matrix to each other via strands. Expanded metal uses a lower blade with a horizontal upper surface and an upper blade with an angled blade, and a metal flat plate protrudes from the lower blade little by little. It is made by repeating spreading. Thus, the metal flat plate is formed in a mesh shape. As shown in FIG. 5A, each mesh is formed by a unit mesh portion 110 having a diamond-like schematic shape. One unit network part 110 is constituted by four bonds connected to each other through four strands.

  Expanded metal has directionality in the mesh due to its structure. This directionality is caused by the fact that the side surfaces of the strands constituting the mesh extend obliquely without being orthogonal to the expanding metal surface. For example, FIG. 5A and FIG. 5B show expanded metal bonds and bonds 102 to 104 and strands 105 to 108 which are part of the strands constituting the cylindrical partition wall 101. The bond 103 and the side surfaces 103a, 106a and 107a of the strands 106 and 107 are each one of the side surfaces constituting the inner surface of the mesh. As shown in FIG. 5B, the side surfaces 103a, 106a, and 107a are all along the D direction. The D direction is not orthogonal to the C direction in FIG. 5B, which is the direction in which the expanded metal constituting the cylindrical partition wall 101 spreads, and is an oblique direction with respect to the C direction. That is, the direction of the D direction is generated in the mesh of the cylindrical partition wall 101. Hereinafter, this D direction is referred to as “mesh direction”.

  The internal combustion unit 100 is arranged on the bottom surface of the combustion chamber 5 (the upper surface of the partition wall 8) so that the five air supply pipes 156 and all the through holes 155b are disposed in the cylindrical partition wall 101 in plan view (see FIG. 2). It is placed. As shown in FIG. 1, the cylindrical partition wall 101 includes an inner space 5 a that is a space inside the cylindrical partition wall 101 in the horizontal direction and an outer space that is a space outside the cylindrical partition wall 101 in the horizontal direction. It is partitioned into a space 5b. Thereby, the air supply part 155 comprises the bottom wall of the inner side space 5a. The outer space 5b is also a space sandwiched between the inner wall surface 2a of the combustion chamber 5 and the cylindrical partition wall 101 in the horizontal direction. The inner space 5 a and the outer space 5 b are in communication with each other through a single mesh in the plurality of unit mesh portions 110 constituting the cylindrical partition wall 101. Thus, the unit mesh part 110 forms the communication part which connects the inner space 5a and the outer space 5b.

  Further, the internal combustion unit 100 is arranged such that the inner space 5a and the outer space 5b are in the positional relationship shown in FIG. 5B with respect to the D direction which is the mesh direction of the cylindrical partition wall 101. At any position of the cylindrical partition wall 101, the mesh direction shown in FIG. From this, the internal combustion part 100 is arrange | positioned so that the direction of the mesh | network in each position of the cylindrical partition wall 101 may become a direction shown to D1-D3 direction of FIG.4 (b).

  In the outer space 5b, as air is supplied from the through holes 153a of the supply pipes 153, a swirling airflow is generated in the direction B in FIG. 2 as described above. As shown in FIG. 2, the swirling airflow is formed in a space that is horizontally sandwiched between the inner wall surface 2 a of the combustion chamber 5 and the outer surface of the cylindrical partition wall 101. In the present embodiment, since an air flow is generated in such a limited space, an air flow swirling around the cylindrical partition wall 101 can be reliably generated. And this swirl | vortex airflow flows along the outer surface of the cylindrical partition 101, as shown to Fig.4 (a). On the other hand, on the outer surface of the cylindrical partition wall 101, a large number of unit mesh portions 110 (see FIG. 5A) that connect the inner side and the outer side of the cylindrical partition wall 101, that is, the inner space 5a and the outer space 5b are opened. Yes. For this reason, when the swirling airflow flows along the outer surface of the cylindrical partition wall 101, an action of sucking air from the inner space 5a to the outer space 5b through the mesh of each unit mesh part 110 occurs.

  The direction of the mesh of the cylindrical partition wall 101 is a direction indicated by directions D1 to D3 in FIG. The direction of the mesh is, in other words, the direction of the expanded metal bonds and the strand side surfaces (for example, the side surfaces 103a, 106a and 107a in FIG. 5B) constituting the cylindrical partition wall 101. The air passing through the meshes of the unit mesh part 110 is guided from the inner space 5a to the side surface formed in the unit mesh part 110 and heads toward the outer space 5b. Therefore, the air passing through the mesh tends to flow along the directions D1 to D3 that are the direction of the mesh (the direction of the side surface). And the angle (for example, angle (alpha) of FIG.4 (b)) which the direction vector which goes to the outer space 5b from the inner space 5a and the direction vector of a swirl | vortex air current along the D1-D3 direction is an acute angle. For this reason, the air sucked into the outer space 5b from the inner space 5a through the mesh of the unit mesh portion 110 is likely to smoothly join the swirling airflow. Thus, the said side surface formed in each unit mesh part 110 plays the role which guides the air from the inner space 5a to the direction of a swirl airflow.

  As shown in FIGS. 1 and 2, a tray 15 is provided on the bottom surface of the combustion chamber 5. Kerosene is injected into the tray 15. The burning of solid fuel is started by igniting the kerosene injected into the tray 15.

  In the above configuration, after ignition of the kerosene in the tray 15, the fuel supply unit 160 supplies the solid fuel to the combustion chamber 5 and the air supply unit 150 supplies air to the combustion chamber 5. Solid fuel burns. The solid fuel from the fuel supply unit 160 falls in the inner space 5a. Therefore, first, the solid fuel burns in the inner space 5a. The combustion air is supplied from the air supply unit 155 and the through holes 155 b and 156 a of the air supply pipe 156 in the air supply unit 150. Since the solid fuel is made of polystyrene (or polyethylene, polypropylene, or the like), combustible gas is generated from the solid fuel when falling in the inner space 5a that has become high temperature by combustion. The combustible gas burns while being mixed with the air supplied from the air supply unit 155 and the air supply pipe 156. A lid part 120 is installed on the upper part of the internal combustion part 100. For this reason, the combustible gas generated in the inner space 5 a is suppressed from flowing out above the internal combustion unit 100.

  When the solid fuel burns in the inner space 5a, impurities or the like may remain unburned, or a part of the solid fuel may be carbonized to generate flaming soot. Then, there is a possibility that such burners accumulate on the air supply unit 155 and block the opening of the through hole 155b of the air supply unit 155. However, even if the through-hole 155b of the air supply unit 155 is blocked by a solid fuel burner or the like, the through-hole 156a of the supply pipe 156 extending above the air supply unit 155 is blocked by the burner or the like. Hard to come off. Therefore, even if the through hole 155b is blocked, the combustion air is supplied from the through hole 156a.

  On the other hand, as described above, the air in the inner space 5a is sucked into the outer space 5b through the mesh of the cylindrical partition wall 101 by the swirling airflow generated in the outer space 5b. Thereby, the combustible gas which remained without burning in the inner space 5a flows out from the inner space 5a to the outer space 5b. The flammable gas that has flowed out joins the swirling airflow in the outer space 5b, and burns while being appropriately mixed with the air in the swirling airflow. In the outer space 5b, a sufficient amount of air and combustible gas are mixed by the formation of the swirling airflow. Therefore, even if combustible gas remains unburned in the inner space 5a, it burns reliably in the outer space 5b.

  According to the boiler 1 according to the present embodiment described above, a swirling airflow is generated in a region sandwiched between the cylindrical partition wall 101 and the inner wall surface 2a of the combustion chamber 5 in the outer space 5b. Since the swirling airflow is generated in such a limited region, the swirling airflow is easily formed reliably. Further, the combustible gas generated from the solid fuel supplied to the inner space 5 a by the swirling airflow formed in the outer space 5 b passes through each unit mesh part 110 to the cylindrical partition wall 101 and the inner wall surface 2 a of the combustion chamber 5. It flows out to the above sandwiched area. That is, the unburned combustible gas generated from the solid fuel in the inner space 5a flows outward toward each unit mesh 110 and swirls outside the cylindrical partition wall 101 through each unit mesh 110 as it is. Easy to merge into the airflow. Therefore, the combustible gas that has not been burned in the inner space 5a is efficiently burned while being engulfed in the swirling airflow appropriately formed in the limited region of the outer space 5b.

  Further, in this embodiment, the mesh (bond and strand side surfaces) of each unit mesh 110 formed in the cylindrical partition wall 101 guides the air in the inner space 5a to the outer space 5b in the direction of the swivel region. . Thereby, the combustible gas in the inner space 5a is likely to smoothly join the swirling airflow. On the other hand, suppose that the cylindrical partition 201 in FIG. 6, which has a mesh direction different from the cylindrical partition 101, is used instead of the cylindrical partition 101. The mesh direction of the cylindrical partition wall 201 is the E1 to E3 direction. In this case, the angle (for example, angle β in FIG. 6) formed by the direction vector from the inner space 5a toward the outer space 5b along the mesh direction and the direction vector of the swirling airflow is an obtuse angle. That is, when the air is guided from the inner space 5a to the outer space 5b, the mesh of the cylindrical partition wall 201 guides in the direction opposite to the swirling airflow. Therefore, the cylindrical partition wall 201 is relatively less likely to generate an airflow from the inner space 5a to the outer space 5b through the mesh, and the combustible gas in the inner space 5a is less likely to join the swirling airflow. Therefore, combustible gas is less likely to burn efficiently than the cylindrical partition wall 101. On the other hand, the mesh of the cylindrical partition wall 101 of the present embodiment guides the air in the inner space 5a to the outer space 5b in the direction of the turning area. For this reason, the combustible gas in the inner space 5a easily joins the swirling airflow, and is caught in the swirling airflow and burns efficiently. Even in the mesh direction like the cylindrical partition wall 201, the combustible gas in the inner space 5a flows out to some extent smoothly into the outer space 5b depending on the opening ratio of the mesh. In this case, a partition in the mesh direction such as the cylindrical partition 201 may be used instead of the cylindrical partition 101.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  For example, in the above-described embodiment, the cylindrical partition wall 101 is made of an expanded metal that is a mesh member. However, instead of such a cylindrical partition 101, a partition formed by a member other than a mesh-like member may be used. For example, the cylindrical partition wall 121 shown in FIG. 7A may be used. The cylindrical partition wall 121 is manufactured by forming a metal plate having a plurality of through holes 121a formed by punching or the like into a cylindrical shape. Each through-hole 121a is formed along a direction oblique to the thickness direction of the partition wall 121 (for example, F1 to F3 direction). Thereby, the surface in each through-hole 121a guides the air which goes to the outer side space 5b from the inner side space 5a in the direction of the turning airflow of the outer side space 5b. In addition, the part which forms the through-hole 121a in the partition 121 respond | corresponds to the communicating part of this invention.

  Further, the cylindrical partition wall 101 is closed along a circle in plan view. However, instead of such a cylindrical partition wall 101, a partition wall closed along a closed curve other than a circle in a plan view may be provided. As the closed curve other than the circle, an ellipse, a polygon having a rounded corner (triangle, quadrangle, pentagon, hexagon, etc.) can be considered.

  Further, instead of the inner space 5a and the outer space 5b being partitioned by the cylindrical partition walls 101 and 121 or the like closed along a closed curve such as a circle in plan view, these spaces may be partitioned by a plurality of partition walls. For example, these spaces may be partitioned by the partition walls 131 to 133 in FIG. Each of the partition walls 131 to 133 is curved in an arc shape in plan view, and has a substantially circular shape as a whole. Gaps 135 to 137 are formed between the ends of the partition walls 131 to 133. The air in the inner space 5a is sucked in the directions G1 to G3 into the outer space 5b by the swirling airflow through these gaps. In addition, the part which forms the gaps 135-137 in the partition 131-133 respond | corresponds to the communication part of this invention. Further, as in the partition walls 141 to 143 in FIG. 7C, the positions of the end portions may be shifted from each other. The air in the inner space 5a is sucked in the directions H1 to H3 into the outer space 5b through gaps 145 to 147 formed between the ends of the partition walls 141 to 143. The air from the inner space 5a toward the outer space 5b is guided in the direction of the swirling airflow in the outer space 5b by the inner surfaces of the partition walls 141 to 143. In addition, the part which forms the gaps 145-147 in the partition walls 141-143 respond | corresponds to the communication part of this invention.

  In the above-described embodiment, as shown in FIG. 2, a through hole 153 a is formed in the air supply pipe 153 so that air flows out from the air supply pipe 153 in the A1 to A3 directions. An air supply pipe 153 ′ shown in FIG. 8 may be used instead of the air supply pipe 153. The supply pipe 153 'is provided with a through hole 153b in addition to the through hole 153a. The through hole 153 b is formed so that air flows out from the air supply pipe 153 toward the center of the combustion chamber 5. A plurality of through holes 153b may be arranged along the vertical direction. Regarding the cross section orthogonal to the air outflow direction, the cross sectional area of the through hole 153b is smaller than the cross sectional area of the through hole 153a. By forming such a through hole 153b, a small amount of air flows out from the supply pipe 153 toward the center of the combustion chamber 5 as compared with the air flowing out from the through hole 153a. Thereby, disturbance can be produced in the whirling airflow of the outer space 5b. Due to such disturbance, air and combustible gas are easily mixed in the outer space 5b, and the combustion efficiency is further improved.

  In the above-described embodiment, the air supply unit 150 supplies air into the combustion chamber 5. However, a supply unit that supplies a gas containing oxygen other than air into the combustion chamber 5 may be provided instead of the air supply unit 150. For example, a supply unit that supplies a gas containing oxygen at a higher concentration than air may be provided.

  In the above-described embodiment, the present invention is applied to a boiler. However, the present invention may be applied to combustion devices other than boilers. For example, the heating heat using air heated to high temperature by the combustion heat in the combustion chamber 5, the power generation device using the pressure of water vapor obtained by evaporating water by the combustion heat in the combustion chamber 5, etc. You may apply to the combustion apparatus utilized variously.

DESCRIPTION OF SYMBOLS 1 Boiler 2a Inner wall surface (combustion chamber) 5 Combustion chamber 5a Inner space 5b Outer space 101 Cylindrical partition 110 Unit mesh part 121 Cylindrical partition 121a Through-hole 131-133 Separation 135-137 Separation 141-143 Separation 145-147 Separation 150 Air Supply unit 153 Supply tube 153a Through hole 155 Supply unit 155b Through hole 156 Supply tube 156a Through hole 157 Blower 160 Fuel supply unit 201 Cylindrical partition

Claims (7)

A combustion section having a combustion chamber formed therein;
A partition that divides the space in the combustion chamber into an outer space and an inner space in the horizontal direction;
A fuel supply unit for supplying solid fuel into the combustion chamber;
A gas supply unit for supplying a gas containing oxygen for combustion into the combustion chamber;
An airflow forming section for generating an airflow in the combustion chamber,
The partition wall forms a communication part for communicating the inner space and the outer space;
The fuel supply unit is configured to supply the solid fuel to a region inside the inner space and inside the communication unit;
An unburned gas generated from the solid fuel in the inner space flows out through the communication portion to a region horizontally sandwiched between the partition wall and the inner wall surface of the combustion chamber in the outer space. The solid fuel combustion apparatus according to claim 1, wherein the airflow forming unit generates a swirling airflow swirling around the partition wall in the region.   2. The solid fuel combustion apparatus according to claim 1, wherein the communication portion has a surface that guides the gas in the inner space to the outer space in the direction of the swirling airflow.   The solid fuel combustion apparatus according to claim 1, wherein the partition wall is closed along a curved line in a plan view.   The solid fuel combustion apparatus according to any one of claims 1 to 3, wherein the partition wall is made of expanded metal.   The said gas supply part supplies the said gas to the said inner space through the through-hole formed in the bottom wall of the said inner space in the said combustion part, The any one of Claims 1-4 characterized by the above-mentioned. Solid fuel combustion device.   The said gas supply part supplies the said gas to the said inner space through the 1st air supply part extended upwards from the bottom wall of the said inner space in the said combustion part. The solid fuel combustion apparatus of any one of Claims 1. The gas supply part has a second air supply part formed with an outlet for allowing the gas to flow into the outer space;
The said airflow formation part forms the said swirl | vortex airflow by making the said gas flow in a predetermined direction from the said 2nd air supply part to the said outside space through the said outflow port. The solid fuel combustion apparatus according to any one of claims 6 to 6.