JPH09166302A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unity the temperature of a catalyst and to miniaturize the catalyst in a conventional combustion equipment in which unification of the temperature and miniaturization of the catalyst of the combustion equipment making use of the heat of the liquefied fuel gas through the catalytic combustion have been difficult relative to a steam generating device, a hot water supplying device, etc., for a suction equipment, a humidifier, or a hot water stool. SOLUTION: A combustion equipment having a space between an inner wall surface of a combustion chamber 15 and a catalyst body 16 is provided with a gas nozzle 13 to eject the liquefied fuel gas, a mixing chamber 14 in which the ejected fuel gas is mixed with air to make the mixed gas, the catalyst body in which the mixed gas is burned through the catalytic combustion, a plurality of carriers are stacked in multiple layers so as to form the cavity between the adjacent carriers, and a communication hole is provided inside, a combustion chamber 15 to store the catalyst body 16, and a gas blocking part to cover the communication hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes heat obtained by catalytically burning liquefied fuel gas to provide a steam generator, a hot water supply device or the like used for an inhaler, a humidifier, or a hot water toilet seat. The present invention relates to a combustion device used.

[0002]

2. Description of the Related Art A conventional steam generator has a structure as shown in FIG. Water for steam generation is stored in the water tank 1. The water in the water tank 1 is supplied to the steam chamber 3 via the water supply pipe 2. A heater 4 is provided on the wall surface of the steam chamber 3, and the water in the steam chamber 3 is heated by the heater 4 to become steam. The high-pressure steam generated in the steam chamber 3 passes through the steam pipe 5 and the accumulator 6 and is ejected from the steam nozzle 7. The steam chamber 3 and the water tank 1 are connected by a communication pipe 8, and the pressure in the steam chamber 3 acts on the water tank 1 so that water can be smoothly supplied from the water tank 1 to the steam chamber 3. There is.

[0003]

However, in such a conventional steam generator, since an electric heater is used as a heating source, a power consumption of several hundred watts is required to generate steam. Therefore, it is difficult to use a dry battery or a storage battery, and the power cord is indispensable. As a result, there are problems that the place of use is limited and the usability is poor.

To solve this problem, if the combustion heat generated when catalytically burning liquid fuel gas or the like is used as a heating source,
A cordless steam generator and hot water supply device can be provided. However, when catalytic combustion of liquid fuel gas is applied, it is necessary to increase the mixing distance between fuel gas and air in order to optimize the mixing ratio of fuel and air and the mixing state of fuel and air. A new issue arises that

Further, in catalytic combustion, the maximum combustion amount per catalyst area is almost constant. Therefore, in order to make the combustor compact, it is necessary to make the catalyst multilayer and reduce the volume of the combustion chamber. . However, when the catalyst is formed in multiple layers, there is a problem that the heat of combustion is concentrated near the center of the catalyst and the temperature of the catalyst near the center of the catalyst becomes high.

Further, when the heating chamber and the water tank are located apart from each other, some device for transferring water from the water tank to the heating chamber is required. However, in the equipment applying the catalytic combustion method, it is unavoidable to use not only the combustion chamber but also the gas tank, and the problem that the equipment becomes large if a water transfer device is added in addition to these element parts. Occurs.

In view of the above problems, it is an object of the present invention to provide a compact combustion device.

[0008]

According to the present invention for solving this problem, a gas nozzle for ejecting fuel gas and a fuel gas and air ejected from the gas nozzle are mixed and mixed. A catalyst body having a mixing portion for converting to a gas and a plurality of the carriers, which burns the mixed gas and have a plurality of the carriers stacked therein so as to form a gap between the carriers adjacent to each other, and a communication hole inside the catalyst body, and the catalyst body. And a combustion chamber to store
Between the inlet of the communication hole on the upstream side in the flow direction of the mixed gas or in the vicinity thereof, and a gas shield for closing the communication hole, and between the inner wall surface of the combustion chamber and the catalyst body. The combustion device is characterized in that there is a void in.

According to a second aspect of the present invention, a gas nozzle for ejecting a fuel gas, and a mixing section for mixing the fuel gas ejected from the gas nozzle and air into a mixed gas,
Combusting the mixed gas, a plurality of the carriers are stacked in a multilayer so that a gap is formed between the carriers adjacent to each other,
Heating that heats water by a catalyst body having a communication hole inside, a combustion chamber accommodating the catalyst body, and a part of the outer wall of the combustion chamber in common, and combustion heat generated by the catalytic combustion of the mixed gas A chamber and a rod-shaped gas shield inserted so as to close all or part of the communication holes of the catalyst body, and there is a gap between the inner wall surface of the combustion chamber and the catalyst body, The combustion device is characterized in that an end of the gas shielding portion located downstream in the flow direction of the mixed gas is thermally connected to the heating chamber wall surface.

In the catalyst body, a plate-shaped carrier having a catalyst layer on the surface and a corrugated plate-shaped carrier having a catalyst layer on the surface are alternately laminated to form concentric circles,
The outermost periphery of the catalyst body may be the corrugated plate-shaped carrier.

According to a fourth aspect of the present invention, there is provided a gas nozzle for ejecting a fuel gas, and a mixing section for mixing the fuel gas ejected from the gas nozzle and air into a mixed gas.
A catalyst body that burns the mixed gas, a combustion chamber that houses the catalyst body, a heating chamber that heats stored water by combustion heat generated by the catalytic combustion of the mixed gas, and a gas of the mixed gas A combustion apparatus, comprising: a pressure adjusting unit that keeps a pressure constant; and a water pressure feeding unit that pressure-feeds water stored in the heating chamber by using a gas pressure of the fuel gas.

Next, an example of the operation of the present invention will be shown below.

When the fuel gas ejected from the gas nozzle flows into the mixing section, the surrounding air is sucked by the attracting action of the gas flow, is uniformly mixed in the mixing section, and is supplied to the combustion chamber. The mixed gas supplied to the combustion chamber flows in the combustion chamber, comes into contact with the catalyst maintained at a high temperature, performs catalytic combustion, and generates combustion heat.

At this time, in order to improve the mixing of the fuel gas and the air in the mixing section, the mixing distance between the fuel gas and the air in the mixing section needs to be long to some extent. Therefore, if the mixing distance is shortened in order to make the combustor compact, the mixing of fuel and air becomes insufficient, which may cause uneven combustion in the combustion chamber.

In view of this, in the present invention, plate-shaped carriers having a catalyst layer on the surface of the catalyst body are overlapped with each other with a gap therebetween to form a multi-layer structure, thereby making the catalyst area in the combustion chamber dense and making the combustion chamber compact. ing.

Further, by providing a gap between the wall surface of the combustion chamber and the outer peripheral portion of the catalyst, the heat transfer to the wall surface of the combustion chamber becomes mainly from heat conduction to heat radiation. It becomes difficult to be affected by the load.

Further, a communication hole is provided at the center of the catalyst body,
By providing a gas shield at the inlet of the communication hole on the upstream side with respect to the flow direction of the air-fuel mixture, when flowing into the combustion chamber, the air-fuel mixture of the fuel gas and the air is a gas at the communication port near the center of the catalyst body. Since the fuel and air flow into the combustion chamber after colliding with the shielding portion once, the mixing of fuel and air is greatly promoted, and the mixing distance of fuel gas and air in the mixing portion can be greatly shortened.

In order to make the combustion device compact, it is necessary to make the catalyst have a multi-layer structure. However, when the amount of the mixed gas that burns in the combustion chamber becomes large, the heat of combustion is concentrated near the center of the catalyst, and The temperature near the center tends to be high.

Therefore, in the present invention, one end of the rod-shaped gas shielding portion is inserted into the communication hole provided in the central portion of the catalyst body, and the other end is thermally connected to the wall surface of the heating chamber so that the combustion heat is removed. The heat of combustion in the central portion of the catalyst, where is easily concentrated, is transferred to the heating chamber by heat conduction through the rod-shaped gas shield.

On the other hand, the outer peripheral portion of the catalyst body, which is easily cooled because it faces the inner wall surface of the combustion chamber having the outer wall integrated with the heating chamber, is provided with a gap between the inner wall surface of the combustion chamber and the outer peripheral portion of the catalyst body. As a result, the heat transfer is performed mainly by the heat radiation, which is hard to be affected by the heat load of the object to be heated, so that the temperature of the outer peripheral portion of the catalyst body is prevented from lowering. As a result, the temperature of the catalyst body can be prevented from increasing and the temperature of the catalyst body can be made uniform.

Further, by inserting a rod-shaped gas shield into the communication hole provided at the center of the catalyst body, the inlet of the communication hole on the upstream side with respect to the flow direction of the air-fuel mixture can be closed, and combustion can be performed. When flowing into the chamber, the mixed gas of fuel gas and air collides with the gas shielding part of the communication hole at the center of the catalyst body and then flows into the combustion chamber, so that the mixture of fuel and air is extremely high. As a result, the mixing distance between the fuel gas and the air in the mixing section can be greatly shortened.

When liquefied fuel gas is used as fuel,
The pressure in the gas tank is considerably high, and when isobutane is taken as an example, it has a high pressure of 2 kg / cm 2 at 20 ° C.

Therefore, in the present invention, the high supply pressure of the liquefied fuel gas is utilized, and a part of the fuel gas is branched to be supplied to the water pressure feed section via a pressure adjusting section for keeping the gas pressure constant. To do. Here, for example, the water pressure feed unit moves the piston when gas pressure is applied to convey water. Since the pressure regulator constantly supplies a constant gas pressure to the water pump, the water in the water tank can be supplied to the heating chamber at a constant flow rate, and it is necessary to use electric parts such as batteries and pumps. Is eliminated, and the combustion device can be made compact.

[0024]

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

A combustion apparatus according to a first embodiment of the present invention will be described with reference to FIG. 1 which is a partial vertical sectional view and FIG. 2 which is an AA sectional view in FIG.
Liquefied fuel gas such as propane and butane is stored in the gas tank 11. The fuel gas in the gas tank 11 is ejected from the gas nozzle 13 through the gas passage 12. A gas flow rate control valve (not shown) may be provided between the gas tank 11 and the gas nozzle 13 to control the flow rate of the fuel gas supplied from the gas tank 11. The fuel gas ejected from the gas nozzle 13 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 has a catalyst body 16 inside, and the mixed gas burns on the surface of the catalyst body 16 to generate combustion heat. The catalyst supported on the catalyst body 16 is a platinum group metal and nickel, cobalt, iron, manganese,
Although metal oxides such as chromium are used, particularly preferred are platinum group metals such as platinum, palladium and rhodium.

Fuel gas is supplied from the gas nozzle 13 to the mixing chamber 14
And the air sucked by being attracted to the jetting force of the fuel gas are mixed with the fuel gas in the mixing chamber 14. The mixed gas produced by the mixing is supplied to the combustion chamber 15. An ignition device 17 is provided on the side of the combustion chamber 15 opposite to the air-fuel mixture inlet, and the mixed gas is ignited by the sparks blown from the plug 18 at the tip of the ignition device 17. When the catalyst body 16 is heated by the flame formed downstream of the catalyst body 16 and the temperature of the catalyst body 16 reaches the activation temperature, the catalyst body 1
Catalytic combustion starts on the surface of 6, the mixed gas is not supplied to the flame, and the flame disappears. Thereafter, the mixed gas supplied into the combustion chamber 15 is catalytically burned by the catalyst body 16 provided inside the combustion chamber 15. The combustion gas is discharged to the atmosphere through the exhaust port 19. Then, when the temperature of the combustion chamber 15 rises, the combustion heat generated by the combustion is transferred to the object to be heated (not shown) via the wall surface of the combustion chamber 15.

The catalyst body 16 in this embodiment is shown in FIG.
As shown in, for example, a flat plate 20 having a catalyst layer on its surface
And a corrugated plate 21 having a catalyst layer on the surface thereof are a concentric multi-layered catalyst body formed by alternately stacking multiple layers. That is, the catalyst body 16 is a catalyst body in which a plurality of carriers are stacked in a multilayer so that a gap is formed between the carriers adjacent to each other. In catalytic combustion,
Since the maximum combustion amount per catalyst area is constant, the catalyst body 16 has such a structure, the catalyst area in the combustion chamber 15 is made dense, and the combustion chamber 15 is made compact.
Further, by forming the corrugated plate 21 at the outermost periphery of the catalyst body 16, a gap is provided between the inner wall surface of the combustion chamber 15 and the outer peripheral portion of the catalyst body 16. As a result, the movement of the combustion heat to the wall surface of the combustion chamber 15 changes from the heat conduction main body to the heat radiation main body, so that it becomes difficult to be affected by the heat load of the object to be heated, and the temperature decrease of the outer peripheral portion of the catalyst body is prevented. be able to.

A communication hole 22 is formed near the center of the catalyst body 16.
Is provided. The inlet of the communication hole 22 on the upstream side with respect to the flow direction of the air-fuel mixture is closed by a gas shield 23 such as a cap. With this configuration, when the mixture of fuel gas and air flows into the combustion chamber 15, the mixture of fuel gas and air first collides with the gas shield 23 near the center of the catalyst body 16 and then the combustion chamber. It will flow into 15. For this reason, the mixture of fuel gas and air supplied to the combustion chamber 15 is the mixture of fuel and air that has once collided with the gas shield 23, and the fuel and air supplied directly to the combustion chamber 15. Since the air-fuel mixture is mixed vigorously at the inlet of the combustion chamber 15, the mixing of fuel and air is greatly promoted. As a result, compared to conventional devices, the mixing chamber 1
The mixing distance between the fuel gas and the air in 4 can be greatly shortened, and the combustion device can be made compact.

In this embodiment, the flat plate 20 and the corrugated plate 21 are overlapped with each other to form a gap in the catalyst layer.
A gap may be provided between the carriers adjacent to each other by stacking flat plates having protrusions.

When a gap is provided between the catalyst body 16 and the inner wall surface of the combustion chamber 15 by providing a protrusion on the inner wall surface of the combustion chamber 15, the outermost periphery of the catalyst body 16 is a corrugated plate. It does not need to be present, and the outermost plate-like body may have any shape.

With respect to the combustion apparatus according to the second embodiment of the present invention, reference will be made to FIG. 3 which is a partial vertical sectional view thereof and FIG. 4 which is a sectional view of a catalyst used in the present embodiment. While explaining. A case where the combustion device is applied to a steam generator will be described. Liquefied fuel gas such as propane and butane is stored in the gas tank 31. The fuel gas in the gas tank 31 is ejected from the gas nozzle 33 through the gas passage 32. A gas flow rate adjusting valve 34 is provided between the gas tank 31 and the gas nozzle 33 so that the flow rate of the fuel gas supplied from the gas tank 31 can be controlled. The fuel gas ejected from the gas nozzle 33 sucks the surrounding air by the attracting action of the gas flow, uniformly mixes it in the mixing chamber 35, and is supplied to the combustion chamber 36. The combustion chamber 36 has a catalyst body 37 therein, and burns the mixed gas on the surface of the catalyst body 37 to generate heat of combustion. As the catalyst supported on the catalyst body 37, platinum group metals and metal oxides such as nickel, cobalt, iron, manganese and chromium are used, and particularly preferable are platinum group metals such as platinum, palladium and rhodium.

Fuel gas is supplied from the gas nozzle 33 to the mixing chamber 35.
The fuel gas is supplied to the combustion chamber 36, and the air sucked by the fuel gas is mixed with the fuel gas in the mixing chamber 35, and the mixed gas is supplied to the combustion chamber 36. An ignition device 38 is provided on the side of the combustion chamber 36 opposite to the air-fuel mixture inlet, and the spark is blown from the plug 39 at the tip of the ignition device 38 to ignite the mixed gas. When the catalyst body 37 is heated by the flame formed downstream of the catalyst body 37 and the temperature of the catalyst body 37 reaches the activation temperature, catalytic combustion starts on the surface of the catalyst body 37, the mixed gas is not supplied to the flame, and the flame Disappear. After that, the mixed gas supplied into the combustion chamber 36 performs catalytic combustion in the entire catalyst body 37 in the combustion chamber 36. Combustion gas is discharged from the combustion chamber outlet 4
After being guided from 0 to the exhaust chamber 41, the exhaust gas is discharged from the exhaust port 43 to the atmosphere via the exhaust passage 42. Combustion chamber 36
The heating chamber 4 having an outer wall integrated with the combustion chamber 36 at the upper part
4 are provided. Then, when the temperature of the combustion chamber 36 rises, the heat of combustion is transferred to the heating chamber 44 via the partition wall 45 and the wall surface 46 of the combustion chamber 36. The water 47 in the heating chamber 44 is heated by this heat of combustion, becomes steam, and is supplied to the steam nozzle 48, and the steam is ejected from the steam ejection port 49 to the atmosphere.

On the other hand, since the exhaust chamber 41 is provided so as to surround the heating chamber 44, the exhaust gas supplied into the exhaust chamber 41 flows along the outer wall surface of the heating chamber 44, and at this time, the heating chamber 44.
Heat is exchanged on the outer wall surface to keep the outer wall surface of the heating chamber 44 warm, and the temperature of the exhaust gas is lowered to be discharged from the exhaust port 43 to the atmosphere.

As shown in FIG. 4, the catalyst body 37 in this embodiment is, for example, a flat plate 50 having a catalyst layer on its surface.
And the corrugated plate 51 having the catalyst layer on the surface are overlapped with each other, so that the plate-shaped bodies having the catalyst layer on the surface are spaced from each other to form a multilayer catalyst body. In catalytic combustion,
Since the maximum combustion amount per catalyst area is constant, the catalyst body 37 has such a structure, the catalyst area in the combustion chamber 36 is made dense, and the combustion chamber 36 is made compact.
In the present embodiment, the gap is provided in the catalyst layer by stacking the flat plate 50 and the corrugated plate 51, but the gap may be provided between the plate-shaped bodies by stacking flat plates having protrusions.

In order to make the combustor compact, the catalyst body 3
Although 7 has a multi-layered structure, when the amount of fuel gas burned in the combustion chamber 36 increases, the combustion heat concentrates near the center of the catalyst body 37, and the temperature near the center of the catalyst body 37 tends to become high. Therefore, in the present embodiment, the communication hole 52 is provided in the vicinity of the center of the catalyst body 37, and the rod-shaped body 53 having excellent thermal conductivity is provided.
One end is inserted and the other end is thermally connected to the wall surface of the heating chamber 44. Furthermore, a gap is provided between the inner wall surface of the combustion chamber 36 having an outer wall integrated with the heating chamber 44 and the catalyst body 37. At this time, a gap may be provided between the catalyst body 37 and the inner wall surface of the combustion chamber 36 by providing a protrusion or the like on the inner wall surface of the combustion chamber 36 or using a corrugated plate on the outermost periphery of the catalyst body 37. By providing such a configuration, the combustion heat in the vicinity of the central portion of the catalyst body 37 where the combustion heat tends to concentrate can be transferred to the heating chamber 44 by heat conduction via the rod-shaped body 53 having excellent heat conductivity. , Catalyst body 3
7 It is possible to prevent the catalyst temperature near the center from increasing. Further, the outer peripheral portion of the catalyst body, which is easily cooled because it faces the inner wall surface of the combustion chamber 36 having the outer wall integrated with the heating chamber 44, has a space between the inner wall surface of the combustion chamber and the outer peripheral portion of the catalyst body. As a result, in order to perform heat transfer mainly by heat radiation, which is hard to be affected by the heat load of the object to be heated, the catalyst body 3
7 prevents the outer peripheral portion of 7 from lowering in temperature. As a result, the catalyst body 37
The temperature can be made uniform.

Further, by inserting the rod-shaped body 53 into the communication port 52 provided in the vicinity of the central portion of the catalyst body 37, the communication hole inlet on the upstream side with respect to the flow direction of the air-fuel mixture can be closed, and combustion can be performed. When flowing into the chamber, the mixture of fuel gas and air once collides with the closed portion of the communication port near the center of the catalyst body 37 and then flows into the combustion chamber 36, so that the mixture of fuel and air is extremely high. As a result, the mixing distance between the fuel gas and the air in the mixing chamber 35 can be greatly shortened.

A third embodiment of the present invention will be described with reference to FIG. 5, which is a partial vertical sectional view thereof. A case where the combustion device is applied to a steam generator will be described. Liquefied fuel gas such as propane and butane is stored in the gas tank 61. The fuel gas in the gas tank 61 is ejected from the gas nozzle 63 through the gas passage 62. A gas flow rate control valve 6 is provided between the gas tank 61 and the gas nozzle 63.
4 is provided so that the flow rate of the fuel gas supplied from the gas tank 61 can be controlled. Gas nozzle 6
The fuel gas ejected from No. 3 sucks the surrounding air by the attracting action of the gas flow, uniformly mixes it in the mixing chamber 65, and is supplied to the combustion chamber 66. The combustion chamber 66 has a catalyst body 67 inside, and burns the mixed gas on the surface of the catalyst body 67 to generate combustion heat. A platinum group metal and a metal oxide such as nickel, cobalt, iron, manganese, and chromium are used as the catalyst supported on the catalyst body 67, and particularly preferable are platinum group metals such as platinum, palladium, and rhodium.

Fuel gas is mixed from the gas nozzle 63 into the mixing chamber 65.
The fuel gas is supplied to the combustion chamber 66, and the air sucked by the fuel gas is mixed with the fuel gas in the mixing chamber 65, and the mixed gas is supplied to the combustion chamber 66. An ignition device 68 is provided on the side of the combustion chamber 66 opposite to the air-fuel mixture inlet, and the spark is blown from the plug 69 at the tip of the ignition device 68 to ignite the mixed gas. When the catalyst body 67 is heated by the flame formed on the downstream side of the catalyst body 67 and the temperature of the catalyst body 67 reaches the activation temperature, catalytic combustion starts on the surface of the catalyst body 67, the mixed gas is not supplied to the flame, and the flame Disappear. After that, the mixed gas supplied into the combustion chamber 66 performs catalytic combustion in the entire catalyst body 67 in the combustion chamber 66. The combustion gas is discharged from the combustion chamber outlet 7
After being introduced into the exhaust chamber 71 from 0, it is exhausted to the atmosphere from the exhaust port 73 via the exhaust passage 72. Combustion chamber 66
A heating chamber 7 having an outer wall integrated with the combustion chamber 66 at the upper part
4 are provided. Then, when the temperature of the combustion chamber 66 rises, combustion heat is transferred to the heating chamber 74 via the partition wall 75 and the wall surface 76 of the combustion chamber 66. The water 77 in the heating chamber 74 is heated by the heat of combustion, becomes steam, and is supplied to the steam nozzle 78, and the steam is ejected from the steam ejection port 79 to the atmosphere.

On the other hand, since the exhaust chamber 71 is provided so as to surround the heating chamber 74, the exhaust gas supplied into the exhaust chamber 71 flows along the outer wall surface of the heating chamber 74, and at this time, the heating chamber 74.
Heat is exchanged on the outer wall surface to keep the outer wall surface of the heating chamber 74 warm, and the temperature of the exhaust gas is lowered to be discharged from the exhaust port 73 to the atmosphere.

When liquefied fuel gas is used as the fuel,
The pressure in the gas tank is considerably high, and when isobutane is taken as an example, it has a high pressure of 2 kg / cm 2 at 20 ° C. In the third aspect of the invention, the high supply pressure of the liquefied fuel gas is utilized to supply the water stored in advance in the water tank 80 to the heating chamber 74.

A part of the fuel gas is branched at the branch portion 81 and supplied to the pressure adjusting device 83 via the valve 82. The pressure adjusting device 83 has a function of supplying a constant gas pressure to the water pressure feeding device 84 when the temperature inside the gas tank 61 changes due to a change in temperature and the gas pressure inside the gas tank 61 changes. The pressure adjusting device 83 includes the springs 85 and 86, the valve 8
7, a bellows 88, etc., and has a function of controlling the gas pressure at a constant level by moving the valve 87 up and down in response to fluctuations in the gas pressure in the gas tank 61. The water pressure feeding device 84 is the piston 8 provided in the water tank 80.
9 and the pressure pipe 90, the pressure pipe 9
When the gas pressure is supplied to 0, the piston 89 is moved to supply the water in the water 80 tank to the heating chamber through the water pipe 91. For this reason, since a constant gas pressure is constantly supplied to the water pressure feeding device 84 by the pressure adjusting device 83, the gas pressure in the gas tank 61 is utilized to heat the water in the water tank 80 at a constant flow rate. 74 can be supplied. Therefore, it is not necessary to use electric parts such as a battery and a pump, which are conventionally required, and the combustion device can be made compact.

[0042]

As is apparent from the above description,
According to the present invention, the catalyst temperature can be made uniform.

Further, according to the present invention, it is possible to provide a downsized combustion device.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view of a combustion apparatus according to a first embodiment of the present invention.

2 is a sectional view taken along line AA in FIG.

FIG. 3 is a partial vertical sectional view of a combustion apparatus according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a catalyst used in the second embodiment.

FIG. 5 is a partial vertical sectional view of a third embodiment of the present invention.

FIG. 6 is a vertical sectional view of a conventional combustion device.

[Explanation of symbols]

 11, 31, 61 Gas tank 13, 33, 63 Gas nozzle 14, 35, 65 Mixing chamber 15, 36, 66 Combustion chamber 16, 37, 67 Catalyst 23 Gas shield 44, 74 Heating chamber 80 Water tank

Claims (4)

[Claims] 1. A gas nozzle for ejecting a fuel gas, a mixing section for mixing the fuel gas ejected from the gas nozzle and air into a mixed gas, and a carrier which burns the mixed gas and is adjacent to each other. A plurality of such carriers are stacked in a multi-layered manner so that there are gaps,
A catalyst body having a communication hole inside, a combustion chamber accommodating the catalyst body, an inlet of the communication hole on the upstream side in the flow direction of the mixed gas, or in the vicinity thereof, for closing the communication hole A combustion apparatus, comprising: a gas shield portion; and a gap between an inner wall surface of the combustion chamber and the catalyst body. 2. A gas nozzle for ejecting a fuel gas, a mixing section for mixing the fuel gas ejected from the gas nozzle with air to form a mixed gas, and a carrier for burning the mixed gas, which are adjacent to each other. A plurality of such carriers are stacked in a multi-layered manner so that there are gaps,
A catalyst body having a communication hole inside, a combustion chamber accommodating the catalyst body, and a part of the outer wall of the combustion chamber are shared, and the combustion heat generated by the catalytic combustion of the mixed gas heats water. A chamber and a rod-shaped gas shield inserted so as to close all or part of the communication holes of the catalyst body, and there is a gap between the inner wall surface of the combustion chamber and the catalyst body, A combustion apparatus, wherein an end portion of the gas shielding portion located on the downstream side in the flow direction of the mixed gas is thermally connected to the wall surface of the heating chamber. 3. The catalyst body comprises a plate-shaped carrier having a catalyst layer on the surface and a corrugated plate-shaped carrier having a catalyst layer on the surface, which are stacked so as to form concentric circles in multiple layers, The communication device according to claim 1 or 2, wherein the communication hole is located at the center of the concentric circle, and the outermost periphery of the catalyst body is the corrugated plate-shaped carrier. 4. A gas nozzle for ejecting a fuel gas, a mixing section for mixing the fuel gas ejected from the gas nozzle and air into a mixed gas, a catalyst for burning the mixed gas, and a catalyst for the same. By the combustion chamber to be stored, and the combustion heat generated by the catalytic combustion of the mixed gas,
A heating chamber that heats the stored water, a pressure adjusting unit that keeps the gas pressure of the mixed gas constant, and the gas pressure of the fuel gas is used to pump the water stored in the heating chamber. A combustion device comprising a water pressure feed unit.