JP2000186804A - Catalyst combusting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height of a burner, and improve the portability by arranging a flat plate-form catalyst body of which the planar area is larger than the cross sectional area, in a combustion chamber, and providing a gas passage by which a mixed gas flows in the planar direction, on the catalyst body. SOLUTION: A fuel gas in a gas tank 11 where a liquefied petroleum gas is stored, is jetted from a gas nozzle 13 through a gas channel 12, and air is sucked in from an air suction port 14 by the jetting effect of the gas stream, and the fuel gas is mixed with the air in a mixing section 15. To the outlet of the mixing section 15, a straight cylindrical gas passage 16 is communicated, and the side surface is communicated with a combustion chamber 18 having a catalyst body 17. The combustion chamber 18 is arranged in the gas passage 16, and the end section of the combustion chamber 18 is located at a place which is inside by a distance D from the end section of the straight cylindrical gas passage 16. The catalyst body 17 is formed into a flat plate-shape wherein the planar area expressed by (the width × the length) is larger than the side surface area expressed by (the width × the thickness).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic combustion device for burning gaseous fuel or liquid fuel.

[0002]

2. Description of the Related Art A conventional catalytic combustion apparatus has, for example, a configuration as shown in FIG. Reference numeral 1 denotes a gas tank for storing a liquefied petroleum gas such as butane or propane. Fuel gas in the gas tank 1 is ejected from a gas nozzle 3 through a gas passage 2. The gas ejected from the gas nozzle 3 sucks air from the intake port 4 by the effect of ejecting the gas flow, mixes the air with the air in the mixing section 5, and supplies the mixed gas to the combustion chamber 6. A catalyst 7 is provided inside the combustion chamber 6, and when the mixed gas passes through the catalyst 7, it is combusted by a catalytic action to generate combustion heat.

An ignition device 8 is provided on a surface 6b of the combustion chamber 6 opposite to the mixed gas inlet 6a. At the time of starting, the sparks blown from the plug 9 at the tip of the ignition device 8
The mixed gas is ignited. By this ignition, a flame is formed downstream of the catalyst 7, and this flame causes the catalyst 7
Is heated. When the temperature of the catalyst 7 rises and reaches the activation temperature, catalytic combustion starts on the surface of the catalyst 7. When the catalytic combustion is started, the mixed gas is not supplied to the flame, and the flame is extinguished. In this state, the mixed gas supplied to the combustion chamber 6 is catalytically combusted by the entire catalyst body 7, and
The combustion gas is exhausted from the exhaust port 10.

[0004] Such a catalytic combustion device is applied to a portable iron, a heater in clothes, a thermal treatment device, and the like as a portable small heat source.

[0005]

However, such a conventional catalytic combustion apparatus has a problem that its portability is not sufficient.

That is, the conventional catalyst body 7 generally has a catalyst supported on a cylindrical honeycomb made of ceramic or metal. Since the diameter of the catalyst body is substantially determined by the amount of combustion, the height of the burner as a whole is set higher than this. I can't make it smaller. Further, if the catalyst body 7 is forcibly reduced, the combustion characteristics deteriorate, and a predetermined calorific value cannot be obtained.

Further, in the conventional catalytic combustion device, since the mixing section 5 and the catalyst body 7 are directly connected and arranged in a straight line,
The length of the entire burner must be increased. Of course, a configuration in which the length is suppressed by bending the mixing section 5 is also conceivable, but the flow velocity distribution of the mixed gas becomes uneven, and the catalytic combustion in the catalyst body 7 becomes uneven. It was difficult to reduce the size.

[0008]

According to the present invention, there is provided a plate-like catalyst body having a plane area larger than a sectional area inside a combustion chamber, and a gas passage through which a mixed gas flows in a plane direction. Is provided, the height of the burner can be reduced, and a compact and thin catalytic combustion device is obtained.

[0009]

According to the first aspect of the present invention, a plate-shaped catalyst body having a plane area larger than a side area is disposed inside a combustion chamber, and a mixed gas is applied to the catalyst body in a lateral direction. By providing a flowing gas passage, the height of the burner can be reduced, and the catalyst combustion device is reduced in size and thickness.

According to a second aspect of the present invention, a straight cylindrical gas passage communicating with the outlet of the mixing section is provided, and the side of the gas passage is connected to the inlet of the combustion chamber. Are arranged in parallel, the length of the burner can be reduced, and the catalytic combustion device can be made compact.

According to a third aspect of the present invention, the length of the straight cylindrical gas passage is made larger than the inlet width of the combustion chamber, and the inlet of the combustion chamber is arranged inside the straight cylindrical gas passage. The catalytic combustion device is capable of mixing the fuel gas and the air more uniformly, and capable of uniformly supplying the mixed gas to the catalyst.

According to a fourth aspect of the present invention, a gas flow resistor for reducing the flow velocity of the mixed gas is provided at the outlet of the mixing section.
The catalytic combustion device is capable of uniformly supplying the mixed gas to the catalyst body by reducing the flow rate of the mixed gas in the straight cylindrical gas passage.

According to a fifth aspect of the present invention, a gas rectifier for rectifying the flow of the mixed gas is provided at the inlet of the combustion chamber to rectify the mixed gas flowing out of the straight cylindrical gas passage so that the mixed gas is evenly distributed to the catalyst. And a catalytic combustion device capable of supplying the same.

According to a sixth aspect of the present invention, there is provided a catalyst body in which a catalyst is supported on a corrugated carrier obtained by bending a thin metal plate into a continuous wave shape, and which has a simple shape, is easily processed continuously, and is excellent in mass productivity. And a catalytic combustion device equipped with

According to a seventh aspect of the present invention, the catalyst body is constituted by supporting a catalyst on a multilayer carrier in which a corrugated sheet obtained by bending a metal sheet in a continuous wave shape and a flat metal sheet are alternately laminated,
The catalytic combustion device is capable of ensuring a high combustion rate even when the amount of combustion increases.

[0016]

(Embodiment 1) A first embodiment of the present invention will be described below. FIG. 1 is a sectional view showing the configuration of the catalytic combustion device of the present embodiment. Reference numeral 11 denotes a gas tank for storing liquefied petroleum gas such as butane and propane. The fuel gas in the gas tank 11 is ejected from a gas nozzle 13 through a gas passage 12. Between the gas tank 11 and the gas nozzle 13, a valve (not shown) for adjusting a gas flow rate is provided. The fuel gas ejected from the gas nozzle 13 sucks air from the intake port 14 and mixes with the air in the mixing unit 15 due to the effect of jetting the gas flow. At the outlet of the mixing unit 15,
A straight cylindrical gas passage 16 is communicated. The side surface of the straight cylindrical gas passage 16 communicates with a combustion chamber 18 having a catalyst body 17. At this time, in the present embodiment, the combustion chamber 18 is disposed inside the straight cylindrical gas passage 16. That is, the end of the combustion chamber 18 is located at a distance D inward from the end of the straight cylindrical gas passage 17.

The catalyst 17 has a shape as shown in FIG. FIG. 2 is a perspective view showing the shape of the catalyst body used in this embodiment. That is, a thin metal plate made of stainless steel or the like is folded into a continuous corrugated sheet and used as a catalyst carrier. In this embodiment, the catalyst is supported on the continuous corrugated catalyst carrier. As the catalyst, a platinum group metal or a metal oxide such as nickel, cobalt, iron, manganese or chromium is used. Particularly preferred are platinum group metals such as platinum, palladium and rhodium. As shown in FIG. 2, the catalyst body 17 has a flat area having a plane area represented by a width A × length B larger than a side area represented by a width A × thickness T.

In this embodiment, the catalyst carrier has a thickness of, for example,
It can be easily constructed by processing a stainless metal foil of 0.05 to 0.1 mm. That is, continuous processing is easy and mass production is excellent. Further, since the catalyst carrier has a continuous corrugated shape as described above, a large surface area per volume can be obtained. That is, an improvement in the catalytic ability can be expected.

FIG. 3 is a sectional view showing a portion accommodating the catalyst 17. When the catalyst body 17 is stored in the combustion chamber 18, the wavy portion a functions as a gas passage. That is, the combustion gas flows through the gas passage in the lateral direction (hereinafter, referred to as a gas passage a). The combustion gas is catalyzed by the catalytic action while passing through the gas passage a.

Also, as shown in FIG.
An ignition device 19 is provided on the side opposite to the entrance of the ignition device. At the time of starting, the ignition device 19 is operated, and the tip plug 2
The spark is skipped from zero. This spark forms a flame downstream of the catalyst 17. The catalyst body 17 is heated by the flame. When the temperature of the catalyst 17 rises and reaches the activation temperature of the catalyst, catalytic combustion starts on the surface of the catalyst 17 and the flame is extinguished. Combustion chamber 1
The mixed gas supplied to 8 performs a catalytic reaction on the entire surface of catalyst body 17 while passing through gas passage a of catalyst body 17 to generate heat, and the combustion gas after the reaction is exhausted from exhaust port 21.

In general, the amount of combustion in a catalytic combustion device is determined by the area of the inlet (cross-sectional area) of the mixed gas of the catalyst when the surface area of the catalyst material and the entire surface of the catalyst are the same. For this reason,
If simply reducing the thickness of the catalyst body, the entrance area is also reduced and the same combustion characteristics cannot be obtained.
The burning rate decreases. Therefore, in the present embodiment, the entrance area is ensured by increasing the width A by an amount corresponding to the reduction in the thickness T of the catalyst body 17. Therefore, according to this embodiment, it is possible to reduce the thickness without lowering the combustion characteristics. Further, as described above, the catalyst body 17 is formed by continuous processing of a thin metal plate, and a large surface area per volume can be obtained, so that the size can be further reduced as compared with the related art.

Next, a method of supplying a mixed gas to the catalyst body 17 employed in this embodiment will be described. The jet velocity of the fuel gas ejected from the nozzle 13 is about several hundred m / sec, and the flow velocity of the mixed gas flowing out of the mixing section 15 is very high. In order to uniformly supply the mixed gas to the thinned catalyst body 17, it is necessary to reduce the flow velocity of the mixed gas and make the flow velocity distribution throughout the inlet of the combustion chamber 18 uniform. Generally, a diffuser is provided at the outlet of the mixing section 16 to gradually widen the passage area to make the flow velocity distribution uniform, but in this method, the diffuser becomes larger as the inlet width of the combustion chamber 18 becomes larger. Therefore, both the length and the width of the combustion device must be increased.

In this respect, in this embodiment, as described above, the outlet of the mixing section 15 is provided with the straight cylindrical gas passage 16 in communication with the outlet, and the outlet of the mixing section 15 is provided so as to communicate with the side of the straight cylindrical gas passage 16. This forms an inlet of the combustion chamber 18.
That is, the positional relationship between the mixing section 15 and the catalyst body 17 is not in series but in parallel. Therefore, according to the present embodiment, the entire length of the combustion apparatus can be reduced, and the apparatus can be made compact.

First, the mixed gas flowing out of the mixing section 15 flows linearly in a straight cylindrical gas passage 16. Thus, when the mixed gas collides with the tip portion 16a of the straight cylindrical gas passage 16, a flow in the opposite direction occurs in the straight cylindrical gas passage 16 due to the collision. This reverse flow and the mixing section 15
The mixed gas supplied from the above interferes with each other. As a result, the flow velocity in the straight cylindrical gas passage 16 becomes extremely small, the static pressure in the whole straight cylindrical gas passage 16 increases, and the mixed gas flows in the direction of the combustion chamber 18 communicating with the side surface of the straight cylindrical gas passage 16. It flows to. At this time, in the present embodiment, as shown in FIG.
Is set larger than the inlet width of the combustion chamber 17,
Further, the inlet of the combustion chamber 18 is disposed within the length of the straight cylindrical gas passage 16. That is, the position of the end of the combustion chamber 18 is
The position is located inside the end 16a of the straight cylindrical gas passage 16 by a distance D. Therefore, the backflow gas generated by the collision at the distal end portion 16a of the straight cylindrical gas passage 16 can be prevented from directly flowing into the combustion chamber 18, and the mixed gas uniformly mixed with the air can be uniformly dispersed in the combustion chamber 18. It can be supplied to That is, the mixed gas is supplied to the combustion chamber 18 at the stage where the flow velocity is reduced due to the interference and the overall static pressure is increased. Therefore, the mixed gas supplied to the combustion chamber 18 is supplied while the static pressure is increased. The fuel gas and the air are more uniformly mixed. In addition, the combustion chamber 1 for mixed gas
The flow velocity distribution at the inlet of the pipe 8 is uniform, and the mixed gas can be supplied to the catalyst 17 evenly.

According to the experiments performed by the inventors, the catalytic combustion apparatus according to the present embodiment can obtain a combustion heat of 60 W or more when the thickness is 6 mm and the length is 50 mm. For this reason, for example, if it is used for heating clothes or the like that wears and warms the body, there is no uncomfortable feeling at the time of use, and it is possible to realize a thing excellent in portability.

Further, for example, when the combustion heat is about 10 W,
Naturally, it can be configured to be smaller and thinner than the dimensions described above, and can be applied to a small heater for hands and feet such as gloves, shoes and socks, and a thermal treatment device that treats by applying a heating part to an arbitrary point. Things.

In this embodiment, as shown in FIG. 1, a gas resistor 22 made of a metal mesh, expanded metal, or the like is provided at the outlet of the mixing section 15. The gas resistor 22 acts to reduce the flow velocity of the mixed gas flowing out of the mixing section 15 to reduce the flow velocity in the straight cylindrical gas passage 16. For this reason, the flow velocity distribution of the mixed gas at the entrance of the combustion chamber 18 can be made more uniform. That is, by using the gas resistor 22, the diameter of the straight cylindrical gas passage 16 can be reduced, and the size of the entire combustion device can be reduced.

Further, in this embodiment, a gas rectifier 23 made of a metal mesh, expanded metal or the like is provided at the entrance of the combustion chamber 18. The gas rectifier 23 functions to rectify the mixed gas flowing from the straight cylindrical gas passage 16 to the combustion chamber 18. Even when the flow of the mixed gas flows in the straight cylindrical gas passage 16 due to a factor such as a change in the flow rate of the fuel gas, the mixed gas can be stably supplied to the entire catalyst body 17. is there.

(Embodiment 2) Next, a second embodiment of the present invention will be described. FIG. 4A is an exploded perspective view showing the configuration of the catalyst body 30 used in the catalytic combustion device of the present embodiment. FIG. 4B is an assembled perspective view.
The catalyst body 30 is configured using a corrugated sheet 31 and a corrugated sheet 33 obtained by bending a metal sheet made of stainless steel or the like into a continuous wave shape, and a flat plate 32 formed of the metal sheet. In the present embodiment, the corrugated sheet 31 and the corrugated sheet 33 are formed of a 0.05 mm thick metal sheet,
The flat plate 32 is made of a thin metal plate having a thickness of 0.1 mm. In this way, the catalyst carrier is laminated on a multilayer body using, for example, spot welding. The catalyst supported on this catalyst carrier is the same as in the first embodiment. The catalyst body 30 is similar to that described in the first embodiment.
The flat area is larger than the cross-sectional area. When stored in the combustion chamber 18, the corrugated portion forms a gas passage along which the mixed gas flows in the side direction.

As described above, according to this embodiment, the catalyst 3
By configuring 0 as a metal multilayer, the surface area per volume can be made larger than that of the configuration described in the first embodiment. Therefore, when the catalyst bodies have the same size, the amount of combustion can be increased.

When the catalytic combustion device is in operation, the flat plate 3
Numeral 2 does not contact the inner wall of the combustion chamber 18. Therefore, the temperature of the flat plate 32 is higher than that of the corrugated plate 31 or the corrugated plate 33, and the active temperature of the catalyst can be easily maintained even when the temperature is adjusted by turning on / off the fuel gas. In other words, the extinction hardly occurs.

Further, the temperature difference between the upstream side and the downstream side of the mixed gas of the catalytic body 30 performing catalytic combustion is also reduced by the soaking action of the flat plate 32. Therefore, according to the present embodiment, it is advantageous for the life of the catalyst body 30.

In this embodiment, the corrugated sheet 31 and the corrugated sheet 33 are made of a thin metal plate having a thickness of 0.05 mm.
It is made of a thin metal plate having a thickness of m, but is not limited to the above thickness.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 5 is a perspective view showing the configuration of the catalyst body 40 used in the catalytic combustion device of this embodiment. In the present embodiment, a corrugated sheet 41 obtained by bending a thin metal sheet into a continuous wave shape is used.
, A similar corrugated plate 43, a similar corrugated plate 45, a thin metal plate 42, and a similar flat plate 44. These materials are used as a multilayer metal catalyst by, for example, spot welding.

In the case of the configuration of this embodiment, the amount of combustion is about 1.10 compared to that of the configuration described in the second embodiment.
It is a factor of five. As described above, according to the present embodiment, by increasing the number of stacked catalyst bodies, the inlet area of the mixed gas and the catalyst surface area can be increased, and the combustion amount differs only by increasing or decreasing the number of parts constituting the catalyst body. A catalyst body can be manufactured. Therefore, standardization of parts is facilitated, and the parts can be manufactured at low cost.

[0036]

According to the first aspect of the present invention, there is provided 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 catalyst inside. And a combustion chamber for burning the mixed gas, wherein the catalyst body has a plate shape in which a flat area is larger than a side area and has a gas passage in which the mixed gas flows in a lateral direction, so that the height of the burner can be reduced, It is intended to realize a compact and thin catalytic combustion device.

According to a second aspect of the present invention, the mixing section has a straight cylindrical gas passage communicating with the outlet, and the inlet of the combustion chamber is arranged in communication with a side surface of the straight cylindrical gas passage.
It is an object of the present invention to realize a catalytic combustion apparatus in which a mixing section and a catalyst body can be arranged in parallel, a burner length can be reduced, and a compact configuration can be achieved.

According to a third aspect of the present invention, the length of the straight cylindrical gas passage is larger than the width of the inlet of the combustion chamber, and the inlet of the combustion chamber is disposed within the length of the straight cylindrical gas passage. It is an object of the present invention to realize a catalytic combustion device capable of mixing fuel gas and air more evenly and supplying the mixed gas evenly to a catalyst.

According to a fourth aspect of the present invention, the mixing section is provided with a gas flow resistor at the outlet to reduce the flow rate of the mixed gas, and the flow rate of the mixed gas in the straight cylindrical gas passage is reduced to form a catalyst body. The present invention realizes a catalytic combustion device that can supply a mixed gas evenly.

According to a fifth aspect of the present invention, the combustion chamber is provided with a gas rectifier for rectifying the flow of the mixed gas at the inlet, and rectifies the mixed gas flowing out of the straight cylindrical gas passage to evenly distribute the mixed gas to the catalyst. It is intended to realize a catalytic combustion device capable of supplying a mixed gas.

According to a sixth aspect of the present invention, the catalyst body has a structure in which a catalyst is supported on a corrugated sheet-like carrier obtained by bending a thin metal plate into a continuous wave shape, and has a simple shape which is easy to continuously process and has excellent mass productivity. It is intended to realize a catalytic combustion device provided with a medium.

According to a seventh aspect of the present invention, in the catalyst body, the amount of combustion in which the catalyst is carried on a multilayer carrier obtained by alternately laminating a corrugated sheet obtained by bending a metal sheet in a continuous wave shape and a flat metal sheet becomes large. This also realizes a catalytic combustion device that can ensure a high combustion rate.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a catalytic combustion device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a catalyst body used in the catalytic combustion device.

FIG. 3 is a cross-sectional view showing a portion of the catalytic combustion device accommodating a catalyst body.

FIG. 4 (a) is an exploded perspective view showing a configuration of a catalyst body used in a catalytic combustion device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing a configuration of a catalyst body used in a catalytic combustion device according to a third embodiment of the present invention.

FIG. 6 is a sectional view showing a configuration of a conventional catalytic combustion device.

[Explanation of symbols]

 13 Gas Nozzle 15 Mixing Section 16 Straight Cylindrical Gas Passage 17 Catalyst 18 Combustion Chamber 22 Gas Flow Resistor 23 Gas Rectifier 30 Catalyst 40 Catalyst

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Nobuichi Nakajima 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (Reference) 3K017 BA07 BB07 BB08 BB09 BF01 3K065 TA11 TA14 TC05 TD05 TG01 TH06 TH11 TK02 TK03 TK06 TP08 TP09

Claims (7)

[Claims] 1. A gas chamber 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 combustion chamber having a catalyst body therein and burning the mixed gas. A catalytic combustion device having a gas passage in which the catalyst body has a flat plate shape having a plane area larger than a side area and through which a mixed gas flows in a side direction. 2. The catalytic combustion device according to claim 1, wherein the mixing section has a straight cylindrical gas passage communicating with an outlet, and an inlet of a combustion chamber is arranged to communicate with a side surface of the straight cylindrical gas passage. 3. The catalytic combustion device according to claim 2, wherein the length of the straight cylindrical gas passage is larger than the width of the inlet of the combustion chamber, and the inlet of the combustion chamber is arranged within the length of the straight cylindrical gas passage. . 4. The mixing unit according to claim 1, wherein a gas flow resistor for reducing the flow rate of the mixed gas is provided at an outlet of the mixing unit.
The catalytic combustion device described in the paragraph. 5. The catalytic combustion apparatus according to claim 1, wherein the combustion chamber has a gas rectifier for rectifying the flow of the mixed gas at an inlet. 6. The catalytic combustion apparatus according to claim 1, wherein the catalyst body has a catalyst supported on a corrugated carrier obtained by bending a thin metal plate into a continuous wave shape. 7. The catalyst body according to any one of claims 1 to 5, wherein the catalyst is carried on a multilayer carrier obtained by alternately stacking a corrugated sheet obtained by bending a metal sheet into a continuous wave and a flat metal sheet. Catalytic combustion device.