JPH07225009A - Heat generator - Google Patents

Abstract

PURPOSE:To shorten a rising time of a catalyst and to improve durability of a fin by arranging a laminar catalyst on an inner wall surface of a combustion chamber and outer wall surface of the fin, and approaching the end of the catalyst to an igniter side from the end of the fin. CONSTITUTION:When a valve 13 of a liquefied gas cylinder 11 is opened and fuel gas is supplied from a nozzle 12 to a mixing chamber 14, fuel gas and sucked air are mixed, and supplied to a combustion chamber 15. The mixture gas is ignited by an igniter 20 on an inner wall surface 15a of the chamber 15, and burned. Thereafter, when a catalyst 18 is heated by a combustion flame to reach an active temperature, catalytic combustion is started. On the other hand, when the temperature of a heat generator 16 detected by a temperature detector 21 becomes higher than a set temperature, the valve 13 is closed. In this case, the length of the fin 17 in the chamber 15 is shortened by a length longer than the catalyst at a downstream 18a of the catalyst 18. That is, the end of the catalyst 18 protrudes to the igniter 20 side from the end of the fin 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an iron, a steamer,
The present invention relates to a heat generating device used in a cooker, a coffee maker, or the like, which burns a gas fuel or a liquid fuel and uses the combustion heat as a heat source.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view of a conventional heating device. Reference numeral 1 is a liquefied gas cylinder such as propane and butane. A valve 3 is provided between the cylinder 1 and the nozzle 2,
The flow rate of the fuel gas supplied from the cylinder 1 can be controlled. The fuel gas ejected from the nozzle 2 sucks the surrounding air by the attraction of the gas flow, uniformly mixes it in the mixing chamber 4, and is supplied to the combustion chamber 5. Combustion chamber 5
Is provided inside the heat generating portion 6 formed of a metal housing. Inside the combustion chamber 5, a plurality of fins 7 are provided substantially parallel to the flow direction of the mixed gas. Combustion chamber 5
Is provided with a catalyst layer 8 in close contact with the wall surface of the combustion chamber.

A thin platinum wire-made ignition heater 9 is heated by a dry battery (not shown), and the temperature of the catalyst layer 8 adjacent thereto is raised. When the catalyst layer 8 is heated to the activation temperature, the valve 3 is opened and the fuel gas is supplied to the mixing section 4 from the nozzle 2. The air sucked by the jetting force of the fuel gas and the fuel gas are mixed in the mixing section 4, and the mixed gas is supplied to the combustion chamber 5. In the combustion chamber 5, when the mixed gas of fuel and air is supplied to the surface of the catalyst layer 8 that has been heated to the activation temperature, the mixed gas starts to burn on the surface of the catalyst layer 8.

This combustion spreads throughout the combustion chamber 5 and heats the object to be heated in the heat generating portion 6. A temperature sensor 10 is provided in the heat generating portion 6.
Is provided, and by opening and closing the valve 3 so as to maintain the set temperature, optimum heating can be performed.

[0005]

Catalytic combustion is a combustion method that allows combustion on the surface of the catalyst without flame and at a low temperature by the action of the catalyst. In the case of a heat generating device that applies catalytic combustion,
Attempts have been made to efficiently transfer the heat of combustion to the heat generating part. For this purpose, a fin is provided in the combustion chamber,
It is trying to efficiently transfer the combustion heat to the heat generating part.

However, even though the catalytic combustion burns at a lower temperature than the flame combustion, the combustion temperature rises to about 700 to 800 ° C. If too much heat is taken from the fins, the temperature of the catalyst will drop and the burning rate will drop.
Further, the catalyst needs to be heated to a certain temperature in order to exhibit its activity, and how to raise the temperature of the catalyst to the activation temperature in a short time at the time of starting is an important issue.

On the other hand, as the material used for the fin, a metal such as aluminum is used because it has excellent thermal conductivity. Therefore, if the adhesion between the catalyst body and the fins is too good, the temperature of the fins becomes high, and the high temperature durability of the metal used for the fins becomes a problem.

Further, since the catalytic combustion burns without flame on the surface of the catalyst, a very large amount of heat is radiated from the surface of the catalyst during the combustion. For this reason, unlike the case of flame combustion, unless heat radiation is efficiently collected, a significant decrease in heat exchange efficiency becomes a problem.

Further, the combustion temperature of catalytic combustion is 700 to 8
The temperature rises to 00 ° C., which causes thermal deformation at both ends of the catalyst body due to strain due to thermal expansion, resulting in a problem that durability of the catalyst body is reduced.

Further, when the valve is opened / closed by a signal from a temperature sensor so that optimum heating can be performed, and the set temperature is maintained, a slight timing deviation when the valve opens causes a smooth rise of catalytic combustion. Without doing
The problem of unstable combustion may occur.

An object of the present invention is to provide a heat generating device which can solve the above-mentioned problems of the prior art and has improved durability.

[0012]

The present invention comprises a fuel gas cylinder, a fuel gas nozzle, a fuel-air mixing section, and a casing having a combustion chamber inside which is provided downstream of the mixing section.
A fin is provided in the combustion chamber substantially parallel to the flow direction of the air-fuel mixture, an ignition device is provided downstream of the fin, and a layered catalyst body is provided on the combustion chamber inner wall surface and the fin outer wall surface. The heat generating device is located closer to the ignition device side than the tip of the fin on the ignition device side.

Further, according to the present invention, there is provided a fuel gas cylinder, a fuel gas nozzle, a mixing portion for fuel and air, and a casing having a combustion chamber inside provided at a downstream portion of the mixing portion, and a flow of the air-fuel mixture in the combustion chamber. The fins are provided substantially parallel to the direction, the ignition device is provided downstream of the fins, the layered catalyst body is provided on the inner wall of the combustion chamber and the outer wall of the fin, and the tip of the catalyst on the mixing section side is located closer to the tip of the fin on the mixing section side. The heating device is close to the mixing section side.

Further, according to the present invention, there is provided a fuel gas cylinder, a fuel gas nozzle, a mixing portion for fuel and air, and a casing having a combustion chamber inside thereof provided downstream of the mixing portion, and the flow of the air-fuel mixture in the combustion chamber. The fins are provided substantially parallel to the direction, the ignition device is provided downstream of the fins, the layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the tip of the catalyst body on the ignition device side is located closer to the tip of the fin on the ignition device side. The heating device is closer to the ignition device side, and the tip of the catalyst portion on the mixing portion side is closer to the mixing portion side than the tip of the fin on the mixing portion side.

The present invention further comprises a fuel gas cylinder, a fuel gas nozzle, a fuel / air mixing section, and a casing having a combustion chamber inside, which is provided downstream of the mixing section, and the flow of the air-fuel mixture in the combustion chamber. The fins are provided substantially parallel to the direction, the layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the air layer is provided between the catalyst body and the fins.

Further, according to the present invention, the thickness of the air layer is made thicker at the fin tip and thinner at the fin end, and the layered catalyst body comprises a thin metal plate and a ceramic coating layer carrying a catalytic metal applied on the thin metal plate. The ceramic coating layer is applied to both sides of a thin metal plate.

Further, the present invention comprises a fuel gas cylinder, a fuel gas nozzle, a fuel / air mixing section, and a casing having a combustion chamber inside, which is provided downstream of the mixing section, and the flow of the air-fuel mixture in the combustion chamber. Fins are provided substantially parallel to the direction, layered catalyst bodies are provided on the inner wall surface of the combustion chamber and the fins, an air layer is provided between the catalyst body and the fins, and the catalyst body is a thin metal plate.
It is composed of a ceramic coating layer supporting a catalytic metal applied on the upper surface of the thin metal plate on the combustion chamber side, and a high radiation material coating layer applied on the upper surface of the thin metal plate on the fin side.

Further, according to the present invention, an air layer is provided between the catalyst body and the fin, and the high radiation material coating layer is applied on the upper surface of the fin.

Further, the present invention comprises a fuel gas cylinder, a fuel gas nozzle, a fuel-air mixing section, and a casing having a combustion chamber inside, which is provided downstream of the mixing section, and the flow of the air-fuel mixture in the combustion chamber. The fins are provided substantially parallel to each other, the layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the air layer is provided between the catalyst body and the fins. Is provided.

Further, according to the present invention, a fuel gas cylinder, a fuel gas nozzle, a mixing portion for fuel and air, and a casing having a combustion chamber inside thereof provided downstream of the mixing portion are provided, and the flow of the air-fuel mixture in the combustion chamber. The fins are provided substantially parallel to each other, and the layered catalyst bodies are provided on the inner wall surface of the combustion chamber and the outer wall surface of the fins. In addition, the amount of the catalyst metal supported is increased.

[0021]

In the present invention, the fuel gas ejected from the nozzle is
The surrounding air is sucked by the attracting action of the gas flow, uniformly mixed in the mixing chamber, and supplied to the combustion chamber. The mixed gas supplied to the combustion chamber flows in the combustion chamber and comes into contact with the layered catalyst body maintained at a high temperature to perform catalytic combustion. As a means for raising the temperature of the catalyst body, an ignition device provided downstream of the fin forms a flame downstream of the catalyst body, and the combustion heat is supplied from the flame base to raise the temperature of the catalyst body. Therefore, as in the present invention, by arranging the tip of the catalyst body closer to the ignition device side than the tip of the fin in the downstream portion of the catalyst body, there is the same effect as reducing the heat capacity of the catalyst body, and the catalyst body is activated in a short time. The temperature can be raised to the temperature, and the rise time can be greatly shortened.

In order to carry out stable catalytic combustion, it is necessary to maintain the temperature of the catalytic body at a high temperature to some extent. Therefore, if there is a fin near the upstream end of the catalyst body, the heat of combustion is transferred to the heating surface more than necessary via the fin, and the temperature of the catalyst may decrease. Therefore, by locating the catalyst body tip upstream from the fin tip upstream, the influence of heat exchange on the heating surface is less likely to appear near the catalyst body upstream end, and stable combustion can be maintained. .

In such catalytic combustion, the combustion is performed near the surface of the catalyst body, and the temperature of the catalyst body becomes high. Therefore, if the adhesion between the catalyst body and the fins is too good, the temperature of the fins becomes high, and the high temperature durability of the metal used for the fins becomes a problem. Therefore, if an air layer is provided between the catalyst body and the fins, the air layer exerts a heat insulating effect, prevents the temperature of the fins from increasing due to combustion heat, and improves the durability of the fins.

Regarding the temperature distribution of the catalyst body, the temperature is lower near the fin end where the heating surface is located and higher at the fin tip. Therefore, thicken the air layer at the tip of the fin,
It is more effective to thin the air layer at the fin end.
Furthermore, by applying the ceramic coating layer supporting the catalyst metal on both sides of the thin metal plate, the air-fuel mixture flowing between the catalyst body and the fins can be burned, and the combustion efficiency can be improved.

Since catalytic combustion burns without flame on the surface of the catalyst, a very large amount of heat is radiated from the surface of the catalyst during combustion. Therefore, unlike the case of flame combustion, even if an air layer exists between the fins and the catalyst body, efficient heat exchange can be performed by efficiently collecting the heat radiation. Therefore, by applying a high radiation material coating layer to the fin side upper surface of the metal thin plate that is the side that radiates heat, or by applying a high radiation material coating layer to the fin upper surface that is the side that absorbs heat,
The emissivity can be improved and the heat exchange efficiency can be improved.

The combustion temperature of catalytic combustion rises to 700 to 800 ° C., so that thermal deformation due to strain due to thermal expansion occurs at both ends of the catalyst body. Therefore, by providing slits at both ends of the catalyst body, this strain can be absorbed and thermal deformation can be prevented. For this reason, peeling of the ceramic coating layer due to thermal deformation can be prevented, and the durability of the catalyst body can be improved.

Further, according to the present invention, when the valve is opened / closed by a signal from the temperature sensor so that optimum heating can be performed and the set temperature is maintained, the rise of catalytic combustion starts from the downstream side of the catalytic body. For this reason, increasing the amount of catalyst metal supported on the downstream side of the catalyst body compared to the amount supported on the upstream side allows the rise of catalytic combustion to proceed smoothly even if an unstable element such as a slight timing deviation when the valve opens. Therefore, the stability of combustion can be improved.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial cross sectional view of one embodiment of the first invention, FIG. 2 is a cross sectional view taken along the line AA of FIG. 1, and FIG.
It is a B line sectional view. Reference numeral 11 is a liquefied gas cylinder such as propane and butane. A valve 13 is provided between the cylinder 11 and the nozzle 12 so that the flow rate of the fuel gas supplied from the cylinder 11 can be controlled. Nozzle 1
The fuel gas jetted from 2 sucks the surrounding air by the attraction of the gas flow, uniformly mixes it in the mixing chamber 14, and is supplied to the combustion chamber 15. The combustion chamber 15 is provided inside a heat generating portion 16 formed of a metal housing. Inside the combustion chamber 15, a plurality of fins 17 are provided substantially parallel to the flow direction of the mixed gas, and the surface area inside the combustion chamber 15 is increased without changing the size of the combustion chamber 15. .

A layered catalyst body 18 is provided in the combustion chamber 15 in close contact with the wall surface of the combustion chamber. The catalyst supported on the catalyst body 18 is a platinum group metal and nickel, cobalt,
Although metal oxides such as iron, manganese, and chromium are used, particularly preferable are platinum group metals such as platinum, palladium, and rhodium.

The valve 13 is opened, and the fuel gas is supplied from the nozzle 12 to the mixing section 14. Air and fuel gas attracted to the jetting force of the fuel gas are mixed with the fuel gas in the mixing section 14,
The mixed gas is supplied to the combustion chamber 15. The mixed gas supplied from the mixing chamber 14 flows in the combustion chamber 15 and is discharged from the exhaust port 19. At this time, in the vicinity of the wall surface 15a of the combustion chamber where the mixed gas flowing in the combustion chamber 15 has collided, a region in which the flow velocity of the mixed gas is very low and the flow stagnates occurs. The ignition device 20 is provided in this region, and the mixed gas is ignited by generating a spark.

When the catalyst body 18 is heated by the formed flame and the temperature of the catalyst body 18 reaches the activation temperature, the catalyst body 1
8 The catalytic combustion starts on the surface, the mixed gas is not supplied to the flame, and the flame disappears. After that, the mixed gas supplied into the combustion chamber 15 performs catalytic combustion in the entire catalyst body 18 in the combustion chamber 15. When it is detected by the signal from the temperature detecting unit 21 of the heat generating unit 16 that the temperature of the heat generating unit 16 exceeds the set temperature, the valve 13 is closed, the supply of the fuel gas is stopped, and the temperature of the heat generating unit 16 is set to the set temperature. When the following is detected from the signal of the temperature detection unit 21, the valve 13 is opened again and the supply of fuel gas is started. The fuel gas supplied again is mixed with air in the mixing chamber 14 and flows into the combustion chamber 15. The air-fuel mixture supplied to the combustion chamber 15 flows in the combustion chamber 15 and combustion spreads again.

In the catalytic combustor as in this embodiment,
The start-up time at startup is due to the temperature rise time until the temperature of the catalyst body reaches the activation temperature. The flame formed on the downstream side of the catalyst body 18 by the igniter 20 supplies combustion heat to the catalyst body 18 from the flame base portion to raise the temperature of the catalyst body 18. When the temperature of the catalyst body 18 reaches the activation temperature of the catalyst, the catalyst combustion is started from the downstream portion of the catalyst body 18, and the combustion shifts to the upstream side. Therefore, it is important how to raise the temperature of the downstream portion of the catalyst body 18 in a short time. Therefore, in the present invention, FIG.
As shown in FIG.
The length of 7 is shorter than that of the catalyst body 18. That is, the tip of the catalyst body projects toward the ignition device 20 side from the tip of the fin. This has the same effect as reducing the heat capacity of the catalyst body 18 as compared with the case where the fins 17 and the catalyst body 18 have the same length, and the catalyst body 18 is heated to the activation temperature in a short time. be able to. Therefore, the start-up time of catalytic combustion can be significantly shortened at the time of starting.

In order to carry out catalytic combustion stably,
It is necessary to keep the temperature of the catalyst body 18 at a high temperature to some extent. Therefore, the fin 17 is provided near the upstream end of the catalyst body 18.
If there is, the combustion heat may be conducted to the heat generating portion 16 more than necessary via the fins 17, and the temperature of the catalyst body 18 may decrease. Therefore, as shown in FIG. 3, by making the length of the fin 17 shorter than that of the catalyst body 18 at the catalyst body upstream end 18b, that is, by making the tip of the catalyst body protrude toward the upstream side of the fin tip, In the vicinity of the upstream end 18b, the influence of heat exchange in the heat generating portion 16 becomes difficult to appear, and the catalyst temperature can be maintained at a high temperature.
If there is a high temperature portion near the catalyst body upstream end 18b, heat is supplied from this portion to the entire catalyst body 18, and the heat generating portion 16
It is possible to maintain the catalyst temperature at a high temperature without being affected by the fluctuation of the load. Therefore, stable combustion can be maintained in the catalyst body 18.

Even if it is said that catalytic combustion burns at a lower temperature than flame combustion, the combustion temperature rises to about 700 to 800 ° C. On the other hand, the fin 17 has a high thermal conductivity in order to efficiently transfer the combustion heat of the catalytic body 18 to the heat generating portion 16, and usually metal such as aluminum is often used. In the case of aluminum, the heat resistant temperature is 400 to 500 ° C. Therefore, if the adhesion between the fin 17 and the catalyst body 18 is too good,
The combustion heat in the catalyst body 18 may be excessively supplied to the fins 17, and the heat resistance of the material used for the fins 17 may be exceeded.

As shown in FIG. 2, the catalyst body 18 and the fin 1
When the air layer 21 is provided between the fins 17 and 7, the air layer 21 exerts an adiabatic effect and prevents the fins 17 from becoming hot due to combustion heat. When the air layer 21 is provided between the catalyst body 18 and the fins 17, the thermal conductivity from the catalyst body 18 to the fins 17 is deteriorated, but since the amount of heat radiation radiated from the surface of the catalyst body 18 is large, The decrease in conductivity can be sufficiently compensated by the increase in heat radiation, and the heat exchange efficiency is not decreased. For this reason, the fin 17 does not become so high as to exceed the heat resistant temperature, and the durability of the fin 17 can be improved.

Regarding the temperature distribution of the catalyst body 18, the temperature is lower near the fin end connected to the heat generating portion 16 and is higher at the fin tip. Therefore, as shown in FIG. 4, the catalyst body 18 is formed by applying a ceramic coating layer 23 carrying a catalyst metal on the upper surface of the thin metal plate 22.
The air layer 21a at the fin tip 17a is thick, and the air layer 21b at the fin end 17b is thin. By adopting such a configuration, in the region where the temperature of the catalyst body is high, the air layer 21 between the catalyst body 18 and the fins 17 is thickened to strengthen the heat radiation element rather than the heat conduction, and the temperature of the catalyst body 18 is increased. In the low region, the air layer 21 between the catalyst body 18 and the fins 17 is thinned to make the heat conduction element stronger than the heat radiation, so that the heat exchange efficiency can be improved without raising the temperature of the fins 17. .

Furthermore, as shown in FIG. 5, when the catalyst coating 18 is coated with the ceramic coating layers 23 and 24 supporting the catalyst metal on both sides of the thin metal plate 22, the following effects can be obtained. In the vicinity of the fin tip 17a where the temperature of the catalyst body 18 is high, even if the thickness of the air layer 21a is increased, the temperature of the catalyst body 18 is high, so that the temperature of the air-fuel mixture near the catalyst body 18 is also high. Since the diffusion rate of air increases, even if the distance between the catalyst body 18 and the fins 17 is wide, the combustion rate of catalytic combustion does not decrease so much. On the other hand, at the fin end 17b where the temperature of the catalyst body 18 is low, the diffusion rate of the air-fuel mixture is reduced so that the interval between the catalyst body 18 and the fins 17 is narrowed and the contact ratio between the catalyst body 18 and the air-fuel mixture is reduced. The increase prevents the combustion efficiency of catalytic combustion from decreasing. As a result, the combustion efficiency can be improved without increasing the fin temperature.

Since catalytic combustion burns flamelessly on the surface of the catalyst, a very large amount of heat is radiated from the surface of the catalyst during combustion. Therefore, unlike the case of flame combustion, even if an air layer exists between the fins and the catalyst body, efficient heat exchange can be performed by efficiently collecting the heat radiation. On the other hand, it is known that a highly radiant material, such as a metal oxide film or a ceramic coating layer, which absorbs radiant heat well, not only efficiently absorbs radiant heat, but also releases radiant heat well. Therefore, as shown in FIG. 6, the high radiation material coating layer 25 is applied to the fin side upper surface of the metal thin plate 22 which is a side that radiates heat, and as shown in FIG. 7, it is the side that absorbs heat. By applying the high radiation material coating layer 26 on the upper surfaces of the fins 17, the emissivity between the catalyst body 18 and the fins 17 can be improved, and the heat exchange efficiency can be improved.

The combustion temperature of catalytic combustion rises to 700 to 800 ° C., and therefore thermal deformation due to strain due to thermal expansion occurs at both ends of the catalyst body 18. When the catalyst body 18 causes thermal deformation, the ceramic coating layer 23 applied to the surface of the metal thin plate 22 is separated from the metal thin plate 22. Therefore, the catalyst body 18 needs to have a structure capable of absorbing thermal strain. Therefore, in the present invention, as shown in FIG. 8, slits 27 are provided at both ends of the catalyst body 18. In this way, the slits 27 are provided in the catalyst body 18, and the slits 2 are formed in the vicinity of the central portions of both ends of the catalyst body 18 where the strain is concentrated due to the thermal expansion.
7 plays the role of a free end, and concentration of thermal stress can be prevented. Therefore, it is possible to absorb the strain due to thermal expansion, and prevent thermal deformation. Therefore, the ceramic coating layer 23 due to thermal deformation can be prevented from peeling off from the metal thin plate 22, and the durability of the catalyst body 18 can be improved.

Further, when the valve 13 is opened / closed by a signal from the temperature sensor 21 so that optimum heating can be performed and the set temperature is maintained, the rise of catalytic combustion starts from the downstream side of the catalyst body 18. Therefore, how quickly the downstream side of the catalyst body 18 can start catalytic combustion is a factor that influences the rising characteristics. Therefore, according to the present invention, as shown in FIG. 9, the amount of catalyst metal carried in the ceramic coating layer 29 downstream of the catalyst body 18 is set to the upstream ceramic coating layer 28.
The catalyst metal loading amount in the above is increased. By doing so, even if an unstable element such as a slight timing deviation when the valve opens, the amount of supported catalyst metal in the downstream portion of the catalyst body where combustion starts increases compared to the upstream side. In addition, the catalytic combustion can be smoothly started up, and the combustion stability can be improved. It was found that the region 29 in which the amount of the catalytic metal supported is large has a sufficient effect at about 5 to 10% of the total length of the catalyst body, and even if the region is further increased, no further effect can be expected.

In FIG. 10, the total supported amount of the catalyst metal supported on the catalyst body 18 is kept constant, and the supported concentration of the catalyst metal on the downstream side of the catalyst body (for example, a region corresponding to 10% of the catalyst body length) is changed. It shows a change in the activation temperature of the catalyst in the case of performing. From this figure, it can be seen that the loading concentration of the catalyst metal loaded on the downstream side of the catalyst affects the activation temperature of the catalyst. Therefore, even if the concentration of the catalyst metal supported on the catalyst body 18 on the downstream side in the flow direction of the air-fuel mixture is increased from the concentration of the catalyst metal supported on the upstream side without increasing the catalyst metal supported amount, the start of catalytic combustion is increased. Is performed smoothly, and the stability of combustion can be improved.

[0043]

As is apparent from the above description,
The present invention, the catalyst body can be heated to the activation temperature in a short time, it is possible to significantly shorten the rise time,
Effects such as stable combustion can be maintained, fin durability can be improved, combustion efficiency and heat exchange efficiency can be improved, and catalyst body durability can be improved. Play.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a heat generating device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the same device of the present invention (a sectional view taken along the line AA of FIG. 1).

FIG. 3 is a vertical sectional view of the same device of the present invention (a sectional view taken along line BB in FIG. 1).

FIG. 4 is a detailed view of a vertical section according to another embodiment of the present invention (corresponding to section AA of FIG. 1).

FIG. 5 is a detailed view of a vertical section according to another embodiment of the present invention (corresponding to section AA in FIG. 1).

FIG. 6 is a detailed view of a vertical section according to another embodiment of the present invention (corresponding to section AA in FIG. 1).

FIG. 7 is a detailed view of a vertical section according to another embodiment of the present invention (corresponding to section AA of FIG. 1).

FIG. 8 is a detailed view of a vertical section according to another embodiment of the present invention (corresponding to section BB in FIG. 1).

FIG. 9 is a detailed view of a vertical section according to another embodiment of the present invention (corresponding to section BB in FIG. 1).

FIG. 10 is a correlation diagram of catalyst loading concentration and catalyst activation temperature in the heat generating device.

FIG. 11 is a horizontal cross-sectional view of a conventional heating device.

[Explanation of symbols]

 12 Nozzles 13 Valves 14 Mixing Chambers 15 Combustion Chambers 16 Exothermic Parts 17 Fins 18 Catalysts 20 Ignition Devices 21 Air Layers 22 Metal Thin Plates 23, 24, 28, 29 Ceramic Coating Layers 25, 26 High Radiation Material Coating Layers 27 Slits

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F23D 14/18 Z 14/28 Z 21/00 D

Claims (11)

[Claims] 1. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a housing having a combustion chamber inside provided in the downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the air-fuel mixture, and the fins are provided downstream of the fins. An ignition device is provided, and a layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the tip of the catalyst body on the ignition device side is brought closer to the ignition device side than the tip of the fin on the ignition device side. A heat generating device characterized in that 2. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a housing having a combustion chamber inside provided in the downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the air-fuel mixture, and the fins are provided downstream of the fins. An igniter is provided, and a layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the tip of the catalyst section on the mixing section side is closer to the mixing section side than the tip of the fin on the mixing section side. A heat generating device characterized in that 3. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a housing having a combustion chamber inside provided in the downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the air-fuel mixture, and the fins are provided downstream of the fins. An ignition device is provided, and a layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the tip of the catalyst body on the ignition device side is closer to the ignition device side than the tip of the fin on the ignition device side. The heating device is characterized in that the tip of the catalyst body on the mixing section side is closer to the mixing section side than the tip of the fin on the mixing section side. 4. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a casing having a combustion chamber inside thereof provided downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the mixture, and the combustion chamber wall surface is provided. A heat generating device, wherein a layered catalyst body is provided on an outer wall surface of the fin, and an air layer is provided between the catalyst body and the fin. 5. The heat generating device according to claim 4, wherein the air layer is thicker at the fin tip and thinner at the fin end. 6. The layered catalyst body comprises a metal thin plate and a ceramic coating layer carrying a catalytic metal applied on the metal thin plate, wherein the ceramic coating layer is applied on both sides of the metal thin plate. Claim 4 or Claim 5
The heat generating device described. 7. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a casing having a combustion chamber inside thereof provided downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the mixture, and the combustion chamber wall surface is provided. And a layered catalyst body is provided on the outer wall surface of the fin, an air layer is provided between the catalyst body and the fin, and the catalyst body is a metal thin plate and a catalyst metal applied on the combustion chamber side upper surface of the metal thin plate. And a high radiation material coating layer applied on the fin-side upper surface of the metal thin plate. 8. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a casing having a combustion chamber inside thereof provided downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the mixture, and the combustion chamber wall surface is provided. A heat generating device characterized in that a layered catalyst body is provided on the outer wall surface of the fin, an air layer is provided between the catalyst body and the fin, and a high radiation material coating layer is applied to the upper surface of the fin. 9. A fuel gas cylinder, a fuel gas nozzle,
The fuel-air mixing section, and a casing having a combustion chamber inside thereof provided downstream of the mixing section, fins are provided in the combustion chamber substantially parallel to the flow direction of the mixture, and the combustion chamber wall surface is provided. And heat generation characterized in that a layered catalyst body is provided on the outer wall surface of the fin, an air layer is provided between the catalyst body and the fin, and slits are provided at both ends or one end of the catalyst body in the flow direction of the air-fuel mixture. apparatus. 10. A fuel gas cylinder, a fuel gas nozzle, a mixing portion for the fuel and air, and a casing having a combustion chamber inside provided in the downstream of the mixing portion, and a flow direction of the air-fuel mixture in the combustion chamber. Fins are provided substantially in parallel with each other, and a layered catalyst body is provided on the inner wall surface of the combustion chamber and the outer wall surface of the fin, and the amount of the catalytic metal carried on the downstream catalyst body in the air-fuel mixture flow direction is carried on the upstream side. A heat-generating device characterized by increasing the amount of the carried catalytic metal. 11. The heat generating device according to claim 10, wherein the concentration of the catalyst metal supported on the catalyst body on the downstream side in the air-fuel mixture flow direction is higher than the concentration of the catalyst metal supported on the upstream side.