JP6743442B2 - Combustion device - Google Patents

Description

The present invention relates to a combustion device, and more particularly to a combustion device including a combustion section and a heat exchanger.

2. Description of the Related Art Conventionally, in a storage-type combustion device in which a combustion gas passage is provided in a storage portion, there is one in which a baffle member is arranged in the combustion gas passage in order to improve thermal efficiency. A storage type combustion device in which a baffle member is arranged in the combustion gas passage is described in, for example, Japanese Patent No. 3903482 (Patent Document 1). In the storage-type combustion device described in this publication, a plurality of communicating portions and a deflecting portion are provided by alternately cutting and raising strip-shaped flat plates in opposite directions.

Japanese Patent No. 3903482

In the storage-type combustion device described in the above publication, when the combustion gas flows through the combustion gas passage from the upstream side to the downstream side, heat exchange between the combustion gas and the heated fluid stored in the storage portion is performed. Therefore, the temperature of the combustion gas becomes low on the downstream side of the combustion gas passage. Therefore, there is a problem that the thermal efficiency is reduced on the downstream side of the fuel gas passage.

The present invention has been made in view of the above problems, and an object thereof is to provide a combustion device that can improve thermal efficiency.

The combustion apparatus of the present invention includes a combustion section and a heat exchanger. The combustion unit is for burning fuel to generate combustion gas. The heat exchanger is for exchanging heat between the combustion gas generated in the combustion section and the fluid to be heated. The heat exchanger includes a storage part, a tube part, and a baffle member. The storage section has an internal space for storing the fluid to be heated. The pipe part is arranged in the storage part so as to penetrate the storage part, has a through hole that is partitioned from the internal space of the storage part, and is for flowing the combustion gas into the through hole. The baffle member is arranged in the through hole of the pipe portion. The baffle member partitions the space in the through hole into one side and the other side, and connects the one side and the other side, and has a plurality of openings arranged side by side in the direction in which the through holes penetrate the storage section. It has a flat plate portion and a plurality of projecting portions alternately projecting from the flat plate portion to one side and the other side between the plurality of openings. The plurality of openings include a plurality of first openings and a plurality of second openings arranged downstream of the plurality of first openings in the flow of the combustion gas. Each of the plurality of second openings has a smaller opening area than each of the plurality of first openings.

According to the combustion device of the present invention, the second opening is located on the downstream side of the combustion gas flowing in the through hole of the pipe portion with respect to the first opening, and has an opening area smaller than that of the first opening. Therefore, the flow velocity of the combustion gas passing through the second opening can be improved. As a result, the chances of contact between the combustion gas that has passed through the second opening and the inner wall of the pipe can be increased. Therefore, thermal efficiency can be improved.

In the above-described combustion device, each of the plurality of second openings of the baffle member is closed at the center and open on both sides. For this reason, since the combustion gas passes through both sides of the second opening, the combustion gas can easily contact the inner wall of the pipe portion. This can further increase the chances of contact between the combustion gas and the inner wall of the pipe portion. Therefore, the thermal efficiency can be further improved.

In the above combustion device, the baffle member has a closed portion. The closing portion is provided at the center of each of the plurality of second openings. At least one of the plurality of protrusions is arranged on the downstream side of the flow of the combustion gas with respect to the plurality of first openings, and the first surface and the second surface located on the opposite side to the first surface. And an insertion hole penetrating from the first surface toward the second surface, and a root portion connected to the flat plate portion. The insertion hole is arranged at the base. The closing portion is inserted through the insertion hole. Therefore, the closed portion can be fixed to the protruding portion along the flat plate portion. Therefore, the baffle member can be easily manufactured.

In the above combustion device, the plurality of protrusions are provided by cutting and raising the flat plate portion. Therefore, it is possible to easily create a plurality of protrusions.

In the above-described combustion device, the combustion section is arranged so as to generate a flame by burning the fuel along the direction in which the through hole penetrates the storage section. Therefore, the combustion gas generated by burning the fuel can be guided straight to the through hole. As a result, the thermal efficiency can be improved by guiding the combustion gas to the through hole in a high temperature state.

In the above combustion device, the combustion section is arranged above the storage section, and is configured to generate a flame downward by burning the fuel. Therefore, the temperature of the heated fluid in the upper portion of the storage portion tends to increase, but the temperature of the heated fluid in the storage portion can be made uniform by increasing the flow velocity of the fuel gas on the downstream side. Thereby, the occurrence of bumping of the fluid to be heated can be suppressed.

As described above, according to the present invention, it is possible to provide the combustion device capable of improving the thermal efficiency.

It is the schematic which shows the structure of the combustion apparatus in one embodiment of this invention. It is an exploded perspective view which shows roughly the structure of the heat exchanger in one embodiment of this invention. It is a fragmentary sectional view which follows the III-III line of FIG. FIG. 4 is a partial cross-sectional view taken along the line IV-IV in FIG. 2. It is an enlarged view of the P1 part of FIG. It is the top view seen from the arrow VI direction of FIG. It is sectional drawing which follows the VII-VII line of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the configuration of the combustion device according to the embodiment of the present invention will be described.

Referring to FIG. 1, combustion device 1 of the present embodiment is a storage combustion device. This is a latent heat recovery type combustion device capable of recovering the latent heat of combustion gas. The combustion device 1 includes a housing 2, a combustion unit 3, a blower 4, a primary heat exchanger (heat exchanger) 5, a secondary heat exchanger 6, a secondary heat exchanger case 6a, and an exhaust gas collection unit. It mainly has a cylinder 7, a silencer 8, a neutralizer 9, a drain pipe 9a, a pipe 10, a water supply pipe 11, a water inlet 11a, a hot water supply pipe 12, and a hot water outlet 12a.

Inside the housing 2, a combustion unit 3, a blower 4, a primary heat exchanger 5, a secondary heat exchanger 6, a secondary heat exchanger case 6a, an exhaust collecting cylinder 7, a silencer 8, a neutralizer 9, a drain pipe. 9a, a pipe 10, a water supply pipe 11 and a hot water supply pipe 12 are housed.

An exhaust port EP is provided on the upper surface of the housing 2. The exhaust port EP is configured to be able to exhaust the combustion gas, whose sensible heat is recovered by the primary heat exchanger 5 and whose latent heat is recovered by the secondary heat exchanger 6, to the outside of the housing 2. A water inlet 11a for supplying water and a hot water outlet 12a for supplying hot water are provided on the side surface of the housing 2.

The combustion section 3 is for burning fuel to generate combustion gas. This combustion gas is for exchanging heat with the primary heat exchanger 5 and the secondary heat exchanger 6. That is, the combustion unit 3 generates combustion gas for exchanging heat with the primary heat exchanger 5 and the secondary heat exchanger 6, and supplies the combustion gas to the primary heat exchanger 5 and the secondary heat exchanger 6. It is for.

The combustion section 3 has a burner 3a and a combustion space section 3b. The burner 3a is configured to form a flame in the vertical direction (downward). The burner 3a has a flame hole plate. The flame hole plate has a flame hole penetrating in the vertical direction. A flame is formed downward from this flame hole. Specifically, the burner 3a is a vaporization type (rotary vaporization type) burner. A combustion space 3b is arranged below the burner 3a. The combustion space section 3b functions as a combustion chamber of the combustion section 3. The combustion is ignited by the burner 3a in a vaporized state and burns in the combustion space 3b. As a result, high-temperature combustion gas and flame are generated.

The combustion section 3 is arranged above the primary heat exchanger 5. The combustion unit 3 is configured to generate a flame downward by burning the fuel. In the present embodiment, the combustion unit 3 is a reverse combustion type device that burns downwardly a fuel such as kerosene supplied from a fuel supply source (not shown) via a fuel pipe. Therefore, the flow of the combustion gas is directed in the vertical direction (downward).

The blower 4 is for supplying combustion air to the combustion unit 3. The blower 4 is arranged above the combustion unit 3. The blower 4 is configured to be able to supply combustion air downward from above the combustion unit 3. Specifically, the blower 4 includes, for example, a fan.

The primary heat exchanger (heat exchanger) 5 is for recovering the heat of the combustion gas. Specifically, the primary heat exchanger 5 is for recovering the sensible heat of the combustion gas supplied by the combustion unit 3. That is, the primary heat exchanger 5 is a sensible heat recovery type heat exchanger. The primary heat exchanger 5 communicates with the exhaust collecting cylinder 7.

The secondary heat exchanger 6 is for recovering the latent heat of the combustion gas supplied by the combustion unit 3. That is, the secondary heat exchanger 6 is a latent heat recovery type heat exchanger. The secondary heat exchanger 6 is housed in the secondary heat exchanger case 6a. The secondary heat exchanger case 6a communicates with the exhaust port EP.

The exhaust collecting cylinder 7 and the muffler 8 constitute a combustion gas flow path connected in series. The exhaust collecting cylinder 7 is located downstream of the primary heat exchanger 5 in the combustion gas flow direction. The muffler 8 is located downstream of the exhaust collecting cylinder 7 in the flow direction of the combustion gas. The silencer 8 communicates with the secondary heat exchanger case 6a. As indicated by the arrow in the figure, the combustion gas generated in the combustion section 3 passes through the primary heat exchanger 5 to exchange heat with the water (fluid to be heated) in the primary heat exchanger 5, and then, the exhaust collecting cylinder 7 To the muffler 8. The combustion gas sent to the silencer 8 passes around the secondary heat exchanger 6 to exchange heat with the water in the secondary heat exchanger 6, and then is exhausted to the outside of the housing 2 through the exhaust port EP. ..

One end of the primary heat exchanger 5 and one end of the secondary heat exchanger 6 are connected to each other by a pipe 10. A water supply pipe 11 is connected to the other end of the secondary heat exchanger 6, and a hot water supply pipe 12 is connected to the other end of the primary heat exchanger 5. The primary heat exchanger 5 is arranged closer to the combustion unit 3 than the secondary heat exchanger 6. The primary heat exchanger 5 is located upstream of the combustion gas flow with respect to the secondary heat exchanger 6.

The water inlet 11a is connected to the water supply pipe 11, and is configured to be able to supply water to the secondary heat exchanger 6 and the primary heat exchanger 5 via the water supply pipe 11. The hot water outlet 12a is connected to the hot water supply pipe 12 and is configured to be able to supply hot water warmed by the secondary heat exchanger 6 and the primary heat exchanger 5. As a result, the water introduced from the water inlet 11a is heated by the combustion gas when passing through the secondary heat exchanger 6 and the primary heat exchanger 5, and is tapped from the hot water outlet 12a.

At this time, the hot water in the primary heat exchanger 5 is heated by heat exchange with the high-temperature combustion gas. The water in the secondary heat exchanger 6 is preheated by passing the combustion gas that has undergone heat exchange in the primary heat exchanger 5 to the secondary heat exchanger 6. In this process, the temperature of the combustion gas is lowered to about 60° C., so that the water contained in the combustion gas is condensed and the latent heat is recovered. Due to the structure in which the steam of the combustion gas is condensed in the secondary heat exchanger 6, condensed water (drain) is generated, so drainage of the drain is necessary.

The drain generated by recovering the latent heat of the combustion gas in the secondary heat exchanger 6 is received by the lower surface of the secondary heat exchanger case 6a. A drain pipe 9a is connected to the lower surface of the secondary heat exchanger case 6a and the neutralizer 9. The drain pipe 9a is configured to be able to supply drain from the secondary heat exchanger 6 to the neutralizer 9. The neutralizer 9 is arranged below the lower surface of the secondary heat exchanger case 6a. Therefore, the drain received on the lower surface of the secondary heat exchanger case 6a flows into the neutralizer 9 through the inside of the drain pipe 9a.

The neutralizer 9 is for storing the drain generated by recovering the latent heat of the combustion gas in the secondary heat exchanger 6. Since the combustion gas contains nitrogen oxides and the like, the nitride oxides and the like are dissolved in the drain and the drain becomes acidic. The neutralizer 9 is for neutralizing the acidic drain generated by recovering the latent heat of the combustion gas in the secondary heat exchanger 6. The neutralizer 9 is filled with a neutralizing agent for neutralizing the acidic drain. The drain neutralized by the neutralizer 9 is discharged to the outside of the housing 2 through a drainage channel (not shown).

Subsequently, the configuration of the primary heat exchanger (heat exchanger) 5 will be described in detail with reference to FIGS. 1 to 7. With reference to FIGS. 1 and 2, the primary heat exchanger (heat exchanger) 5 includes a storage portion 51, a pipe portion 52, a baffle member 53, and a closing portion 54.

2 and 3, the storage portion 51 has an outer wall portion 51a and an internal space IS surrounded by the outer wall portion 51a. The internal space IS is for storing the fluid to be heated. The pipe portion 52 is arranged in the storage portion 51 so as to penetrate the storage portion 51. The pipe portion 52 has a through hole 52a extending in the axial direction of the pipe portion 52. The through hole 52a is partitioned from the internal space IS of the storage section 51. The pipe portion 52 is for flowing the combustion gas into the through hole 52a. As shown in FIG. 1 and FIG. 3, the combustion unit 3 is arranged so as to generate a flame by burning the fuel along a direction in which the through hole 52 a of the pipe portion 52 penetrates the storage unit 51.

2 to 4, the baffle member 53 is for deflecting the flow of combustion gas. The baffle member 53 is arranged in the through hole 52a of the pipe portion 52. The baffle member 53 has a flat plate portion 53a and a plurality of protruding portions PP.

The flat plate portion 53a has a strip shape. Specifically, the flat plate portion 53a is configured to extend in the axial direction of the tube portion 52 (the penetrating direction of the through hole 52a). The width of the flat plate portion 53a is substantially the same as the inner diameter of the through hole 52a. The flat plate portion 53a is configured to partition the space in the through hole 52a into one side S1 and the other side S2 with the flat plate portion 53a interposed therebetween. That is, the flat plate portion 53a is partitioned into one side S1 and the other side S2 in the radial direction of the through hole 52a.

The flat plate portion 53a has a plurality of openings OP. Each of the plurality of openings OP penetrates the flat plate portion 53a in the thickness direction. Each of the plurality of openings OP connects one side S1 and the other side S2. That is, the one side S1 and the other side S2 communicate with each other through each of the plurality of openings OP. The plurality of openings OP are arranged side by side in the direction in which the through holes 52 a penetrate the storage section 51.

Each of the plurality of protrusions PP alternately protrudes from the flat plate portion 53a between the plurality of openings OP in the one direction side and the other direction side. That is, the plurality of projecting portions PP project in opposite directions to the flat plate portion 53a, and the projecting portion PP arranged on one side of the flat plate portion 53a and the projecting portion arranged on the other side of the flat plate portion 53a. Are offset from each other.

Each of the plurality of protrusions PP is arranged in the axial direction of the pipe portion 52 with each of the plurality of openings OP interposed therebetween. That is, each of the plurality of openings OP is arranged between each of the plurality of protrusions PP. The outer peripheral end of each of the plurality of protrusions PP is configured to extend along the inner wall of the pipe portion 52.

Each of the plurality of protrusions PP is provided by cutting and raising the flat plate portion 53a. Each of the plurality of openings OP is provided in a portion cut and raised from each flat plate portion 53a of each of the plurality of protrusions PP.

As shown in FIG. 4, each of the plurality of protrusions PP closes one of the one side S1 and the other side S2, and each of the plurality of openings OP arranged between each of the plurality of protrusions PP becomes. By connecting the one side S1 and the other side S2, the flow path is configured so that the combustion gas meanders.

In addition, each of the plurality of protruding portions PP may be provided so as to be orthogonal to the flat plate portion 53a. Further, each of the plurality of projecting portions PP may be arranged at equal intervals in the axial direction of the pipe portion 52.

The plurality of openings OP include a plurality of first openings OP1 and a plurality of second openings OP2. Each of the plurality of second openings OP2 has a smaller opening area than each of the plurality of first openings OP1. In the flow of the combustion gas flowing through the through hole 52a of the pipe portion 52, the plurality of second openings OP2 are arranged on the downstream side of the flow of the combustion gas with respect to the plurality of first openings OP1. The plurality of protrusions PP include a first protrusion PP1 protruding from the flat plate portion 53a to the one side S1 between the first opening OP1 and the second opening OP2.

The baffle member 53 moves downstream of the first projecting portion PP1 through the second opening OP2 after the combustion gas moves from one side S1 upstream of the first projecting portion PP1 to the other side S2 through the first opening OP1. It is configured to move to one side S1.

Each of the plurality of second openings OP2 of the baffle member 53 is closed at the center and open on both sides. The closing portion 54 is provided at the center of each of the plurality of second openings OP2. As a result, the opening area of each of the plurality of second openings OP2 is smaller than the opening area of each of the plurality of first opening OP1.

The closing portion 54 includes a plate-shaped portion 54a and a locking portion 54b. The plate-shaped portion 54a has a rectangular shape in a plan view. The plate-shaped part 54a covers a part of the plurality of openings OP. The plate-shaped portion 54a may be tapered so that the width thereof becomes wider toward the downstream side in a plan view.

The pipe portion 52 has a small diameter portion GP whose inner diameter is partially reduced. The small diameter portion GP is arranged below the pipe portion 52. The lower end of the flat plate portion 53a is in contact with the small diameter portion GP. As a result, the baffle member 53 can be prevented from falling out of the pipe portion 52.

The locking portion 54b projects from the lower end of the plate-shaped portion 54a. The locking portion 54b projects downward from the lower end of the pipe portion 52. The locking portion 54b is bent in a direction intersecting the axial direction of the pipe portion 52. The locking portion 54b has a size larger than the radius of the pipe portion 52. The locking portion 54b extends to the outside of the outer peripheral end of the pipe portion 52. Thereby, the baffle member 53 can be prevented from coming off from the pipe portion 52 upward. The plate-shaped portion 54a of the closing portion 54 is spot-welded to the baffle member 53 in the vicinity of the locking portion 54b and does not drop.

5 to 7, at least one of the plurality of projecting portions PP is arranged on the downstream side of the flow of the combustion gas with respect to the plurality of first openings OP1. Specifically, the plurality of protruding portions PP include a second protruding portion PP2 protruding from the flat plate portion 53a to the one side S1 and arranged on the downstream side of the first protruding portion PP1. The second protruding portion PP2 has a first surface F1, a second surface F2, an insertion hole H, a root portion RP, and a tip portion TP.

The first surface F1 is arranged so as to face the second surface F2. The second surface F2 is located on the opposite side of the first surface F1. The insertion hole H penetrates from the first surface F1 toward the second surface F2. The root portion RP is connected to the flat plate portion 53a. The tip portion TP is located on the opposite side of the root portion RP. The tip portion TP is located at the tip in the direction of protruding from the flat plate portion 53a. The insertion hole H is arranged at the root portion RP. The insertion hole H may be continuously provided from the root portion RP to the flat plate portion 53a. The closing portion 54 is inserted into the insertion hole H. When the second projecting portion PP2 is viewed from the direction orthogonal to the first surface F1, the insertion hole H has an opening shape that is substantially the same as the cross-sectional shape of the plate-shaped portion 54a of the closing portion 54.

The P1, P2, and P3 parts in FIG. 3 have the same structure. Therefore, the closed portion 54 is fixed by being inserted into the insertion hole H at a plurality of locations.

Next, the operation of the combustion device 1 of the present embodiment will be described.
Referring to FIG. 1, by turning on the operation switch and flowing a predetermined amount of water into the water supply pipe 11, the fan of the blower 4 starts to rotate and the burner 3a of the combustion unit 3 is ignited. Combustion gas is sent downward from the burner 3a as shown by the arrow. With reference to FIG. 3 and FIG. 4, the discharged combustion gas flows in the through hole 52 a of the pipe portion 52 of the primary heat exchanger 5.

Since the flow path is configured such that the combustion gas meanders by each of the plurality of protrusions PP and each of the plurality of openings OP, the combustion gas passes through each of the plurality of openings OP and flows to one side. Flowing from the upstream side to the downstream side in the through hole 52a of the pipe portion 52 while alternately moving S1 and the other side S2.

Next, as indicated by the arrow in FIG. 1, the combustion gas flows in the exhaust collecting cylinder 7 and then in the silencer 8. Next, the combustion gas flows through the secondary heat exchanger case 6a and then is exhausted to the outside from the exhaust port EP.

On the other hand, the water sent from the water supply pipe 11 flows in the secondary heat exchanger 6. While flowing through the secondary heat exchanger 6, water (fluid to be heated) is preheated by the combustion gas (latent heat). Next, the preheated water is sent to the primary heat exchanger 5 through the pipe 10.

1 and 5, the preheated water sent to primary heat exchanger 5 is stored in internal space IS of storage unit 51. Heat exchange is performed between the water stored in the storage portion 51 and the combustion gas (sensible heat) flowing through the through hole 52a of the pipe portion 52, and the preheated water is heated to a predetermined temperature. The hot water heated to a predetermined temperature is sent out through the hot water supply pipe 12. In this way, hot water of a predetermined temperature can be supplied.

Next, the function and effect of the combustion device 1 of the present embodiment will be described.
As shown in FIGS. 3 and 4, according to the combustion device 1 of the present embodiment, the second opening OP2 is located downstream of the combustion gas flowing in the through hole 52a of the pipe 52, as compared with the first opening OP1. It is located on the side and has an opening area smaller than that of the first opening OP1. Therefore, the flow velocity of the combustion gas passing through the second opening OP2 can be improved. This can increase the chances of contact between the combustion gas that has passed through the second opening OP2 and the inner wall of the pipe 52. Therefore, thermal efficiency can be improved.

Further, in the combustion apparatus 1 of the present embodiment, the center of each of the plurality of second openings OP2 of the baffle member 53 is closed and both sides of the second opening OP2 are open. Therefore, since the combustion gas passes through both sides of the second opening OP2, the combustion gas can easily contact the inner wall of the pipe portion 52. That is, since the both sides of the second opening OP2 are located closer to the inner wall of the pipe portion 52 than the center of the second opening OP2, the combustion gas passes through both sides of the second opening OP2, and thus the combustion gas is burned. The gas can be easily contacted with the inner wall of the pipe portion 52. This can further increase the chances of contact between the combustion gas and the inner wall of the pipe portion 52. Therefore, the thermal efficiency can be further improved.

Further, in the combustion device 1 of the present embodiment, the insertion hole H of the second projecting portion PP2 is arranged at the root portion RP connected to the flat plate portion 53a. The closing portion 54 is inserted into the insertion hole H. Therefore, the closing portion 54 can be fixed to the second protruding portion PP2 along the flat plate portion 53a. Therefore, the baffle member 53 can be easily manufactured.

In addition, in the combustion device 1 of the present embodiment, the plurality of protrusions PP are provided by cutting and raising the flat plate portion 53a. Therefore, the plurality of protrusions PP can be easily created.

As shown in FIG. 1 and FIG. 3, in the combustion device 1 of the present embodiment, the combustion unit 3 burns fuel to generate flame along the direction in which the through hole 52 a penetrates the storage unit 51. Are arranged as follows. Therefore, the combustion gas generated by burning the fuel can be guided straight to the through hole 52a. As a result, the thermal efficiency can be improved by guiding the combustion gas to the through holes 52a in a high temperature state.

In the combustion device of the present embodiment, the combustion unit 3 is arranged above the storage unit 51, and is configured to generate a flame downward by burning the fuel. Therefore, the temperature of the heated fluid in the upper portion of the storage portion 51 tends to increase, but the temperature of the heated fluid in the storage portion 51 can be made uniform by increasing the flow velocity of the fuel gas on the downstream side. .. Thereby, the occurrence of bumping of the fluid to be heated can be suppressed.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1 combustion device, 2 housing, 3 combustion part, 3a burner, 3b combustion space part, 4 blower, 5 primary heat exchanger, 6 secondary heat exchanger, 6a secondary heat exchanger case, 7 exhaust collecting cylinder, 8 Muffler, 9 Neutralizer, 9a Drain pipe, 10 pipe, 11 Water supply pipe, 11a Water inlet, 12 Hot water supply pipe, 12a Hot water outlet, 51 Storage part, 51a Outer wall part, 52 Pipe part, 52a Through hole, 53 Baffle member , 53a Flat plate portion, 54 Closure portion, 54a Plate portion, 54b Locking portion, F1 first surface, F2 second surface, H insertion hole, IS internal space, OP opening portion, OP1 first opening portion, OP2 second portion Opening portion, PP protruding portion, PP1 first protruding portion, PP2 second protruding portion, RP root portion, S1 one side, S2 other side.

Claims (5)

A combustion unit for combusting fuel to generate combustion gas;
A heat exchanger for exchanging heat between the combustion gas generated in the combustion section and the fluid to be heated,
The heat exchanger is
A storage portion having an internal space for storing the heated fluid,
Arranged in the storage part so as to penetrate the storage part, having a through hole partitioned from the internal space of the storage part, and a pipe part for flowing the combustion gas into the through hole,
A baffle member disposed in the through hole of the tube portion,
The baffle member partitions the space in the through hole into one side and the other side, and connects the one side and the other side, and the through holes are arranged side by side in the direction of penetrating the storage portion. A flat plate portion having a plurality of openings, and a plurality of protruding portions alternately protruding from the flat plate portion to the one side and the other side between the plurality of opening portions,
The plurality of openings include a plurality of first openings and a plurality of second openings arranged on the downstream side of the flow of the combustion gas with respect to the plurality of first openings,
Each of the plurality of second openings, have a smaller opening area than each of the plurality of first openings,
A combustion device in which each of the plurality of second openings of the baffle member is closed at the center and open on both sides . The baffle member is
A closing portion provided at the center of each of the plurality of second openings,
At least one of the plurality of protrusions is arranged on the downstream side of the flow of the combustion gas with respect to the plurality of first openings, and is located on the first surface and on the opposite side of the first surface. A second surface, an insertion hole penetrating from the first surface toward the second surface, and a root portion connected to the flat plate portion,
The insertion hole is arranged at the root portion,
The combustion device according to claim 1 , wherein the closing portion is inserted into the insertion hole. The combustion device according to claim 2 , wherein the plurality of protruding portions are provided by cutting and raising the flat plate portion. The combustion section, the through-hole flame by combusting the fuel is arranged to occur along the direction penetrating the reservoir, according to any one of claims 1 to 3 Combustion device. The combustion section is disposed above the heat exchanger, and has a flame by combusting the fuel is configured to generate downward, any one of claims 1-4 The combustion device according to 1.