JP3644627B2 - Catalyst unit, catalytic combustion plate and catalytic combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a catalyst unit, a catalytic combustion plate, and a catalytic combustion device that perform catalytic combustion of vaporized liquid fuel.
[0002]
[Prior art]
Catalytic combustion is known in which the combustion temperature is lower than flame combustion, and combustion is performed without flame. Catalytic combustion has various merits such as generation of harmful exhaust gas such as NOx, combustion of a lean air-fuel mixture, wide adjustment range of combustion amount, and large amount of radiant heat. For this reason, use of catalytic combustion in a heating device that emits warm air or infrared rays has been studied. As one of them, a catalytic combustion apparatus in which a catalyst plate is provided in front and a vaporization chamber for vaporizing sprayed liquid fuel is disposed behind the catalyst plate has been studied. In this catalytic combustion apparatus, the vaporizing chamber is heated by the heat (radiant heat) of the catalyst plate whose temperature has increased due to catalytic combustion. Therefore, the liquid fuel can be vaporized by the heat of catalytic combustion, and the vaporized liquid fuel and air are supplied to the catalyst plate in a mixed state, and catalytic combustion is continued. Therefore, since the heater for vaporization etc. is unnecessary, it is a catalytic combustion apparatus which can continue catalytic combustion stably with a simple structure.
[0003]
[Problems to be solved by the invention]
The size (area) of the catalyst plate of such a catalytic combustion apparatus is selected based on the heat load depending on the purpose and application of the heater and the like. Further, since the catalyst plate is often composed of a porous ceramic plate carrying a catalyst such as platinum, the size of one plate is limited in order to manufacture the ceramic plate at an appropriate cost. For this reason, one catalyst plate is not sufficient for general use in a heating appliance (combustor) that outputs a large calorific value. For example, a plurality of catalyst plates of about 100 mm square are used. It is necessary to form a heat dissipation surface.
[0004]
When a plurality of catalyst plates are used side by side, the catalyst plates are thermally expanded, so that if they are connected directly, the thermal expansion cannot be absorbed. For this reason, there is a risk of cracking due to repeated expansion and contraction. There is also a problem that it is difficult to directly connect the catalyst plates made of ceramic. For this reason, it is considered to join a large number of catalyst plates in a state where individual catalyst plates are put in a metal frame.
[0005]
However, it is necessary to secure a space for the catalyst plate to thermally expand, and due to the difference in coefficient of thermal expansion between the frame and the catalyst plate, if the catalyst plate is directly attached to the frame, a gap is generated between them. Therefore, the vaporized fuel leaks from the gap, resulting in a decrease in combustion efficiency, fuel burning on the surface of the catalyst plate, and unburned harmful components released outside the system. The problem of becoming. For this reason, it can be considered that the main body side of the catalytic combustion apparatus (combustor) is held via gaskets around the individual catalyst plates so as to eliminate gaps. However, glass wool, ceramic wool, etc. used as gaskets tend to be thin and deform when exposed to high temperatures by combustion heat. For this reason, in order to absorb thermal expansion, it is desirable to connect a large number of frames with a frame, but processing of the gap is a problem, and a catalytic combustion apparatus having a large heat generation capacity cannot be realized.
[0006]
Therefore, in the present invention, by allowing the catalytic combustion to be continued in a state in which no gap is generated during combustion, there is no reduction in combustion efficiency or there is no unstable element, and a catalyst unit that can guarantee a desired large calorific value output. An object of the present invention is to provide a catalytic combustion plate and a catalytic combustion apparatus. Another object of the present invention is to provide a safe, clean and quiet catalytic combustion apparatus that eliminates harmful components due to incomplete combustion and takes advantage of catalytic combustion, and has high combustion efficiency.
[0007]
[Means for Solving the Problems]
For this reason, in this invention, the thermal expansion gasket which has the characteristic which expands when exposed to high temperature is employ | adopted, and the clearance gap between a flame | frame and a catalyst plate is prevented by fitting a catalyst plate in a flame | frame via this. At the same time, the catalyst plate is supported by a heat-expandable gasket that can be contacted to eliminate the gap when thermally expanded, so that the catalyst plate is not damaged even when thermally expanded. That is, the catalyst unit of the present invention has a catalyst plate for catalytic combustion of vaporized fuel and a metal frame shaped along the edge of the catalyst plate, and the catalyst plate is a thermally expandable gasket on this frame. It is characterized by being inserted through.
[0008]
In the catalyst unit of the present invention, the catalyst plates are individually supported by the frame, and the thermally expandable gasket fitted between them (the gap) is thermally expanded, thereby closing the gap and preventing damage due to the thermal expansion. Therefore, when a plurality of catalyst units are lined up to produce a high-power catalytic combustion plate, the gap between the frame and the catalyst unit can be eliminated, so that unburned components leaking from the frame can be eliminated. For this reason, the contact efficiency between the catalyst and the vaporized fuel is increased, and the combustion efficiency is improved. At the same time, the above-mentioned problems associated with leaked unburnt components can be solved. Therefore, it is possible to obtain a catalytic combustion apparatus having a desired large output (large calorific value), and it is possible to actually provide a combustion apparatus that utilizes the characteristics of clean and safe catalytic combustion.
[0009]
Note that the thermally expandable gasket according to the present invention can be expanded at the stage of a combustion test performed on the manufacturer side before shipment of an apparatus equipped with a catalyst unit or a catalyst combustion plate, so that it can be expanded at the time of shipment. Accordingly, it is possible to prevent damage to the catalyst plate in the distribution stage such as conveyance.
[0010]
The catalyst plate is fixed to the frame in a state where the thermally expandable gasket is expanded, but in order to temporarily fix the catalyst plate to the frame until then, the front plate holding the front surface of the catalyst plate along its edge, and the catalyst plate It is desirable to provide a nail for intermittently supporting the back surface of the. Thus, when the heat-expandable gasket is inflated and heated in a temporarily fixed state, the gap is filled and can be fixed. Therefore, a large number of catalyst plates can be easily held at predetermined positions on each frame. Even after the thermal expansion gasket expands, the front and back of the catalyst plate are supported by the front presser and the claws, so that reinforcement is provided, and a stable and reliable catalyst unit, catalyst combustion plate, and catalyst combustion apparatus can be provided.
[0011]
Each of the catalyst units may be circular or elliptical, but in the present invention, it is a triangle or a polygon of a quadrangle or more in which a plurality of catalyst plates can be arranged adjacent to each other. Furthermore, by providing a seal hole along the frame where the thermally expandable gasket is exposed at a portion where the frame is adjacent to the other frame, the thermally expandable gasket is expanded from the seal hole toward the other adjacent frame. To do. Therefore, the gap between the frames can be eliminated by the thermally expandable gasket, and at the same time, it contributes to the coupling between the frames. Therefore, in order to connect a plurality of catalyst units so as to have a desired area, sufficient strength can be ensured only by spot welding several appropriate portions adjacent to each other. Therefore, it is not necessary to weld many portions on the front surface of the frame in order to ensure the strength of the catalytic combustion plate and eliminate the gap between the frames, and the appearance by welding such as the welding agent sticking out is not deteriorated. . Therefore, it is possible to save time and labor such as welding, and a high-efficiency and clean combustion apparatus utilizing the characteristics of catalytic combustion can be provided with high quality, short delivery time, and low cost.
[0012]
As described above, in the present invention, a plurality of catalyst units are arranged in an array, and a catalyst combustion plate having a size corresponding to a desired heat load can be provided easily and with high quality. And, by adopting the catalytic combustion plate of the present invention and providing a vaporizing chamber for vaporizing and supplying liquid fuel to the catalytic combustion plate, it can be applied practically, has high combustion efficiency, is safe and harmful. It is possible to provide a catalytic combustion apparatus utilizing the merit of catalytic combustion such as a small amount.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a catalytic combustion apparatus employing a catalytic combustion plate according to the present invention. The catalytic combustion apparatus 5 of this example includes a cylindrical housing 10 extending in the horizontal direction, and a catalytic combustion plate 20 is provided on the front 10a of the housing 10 so as to face the outside. As shown in a plan view in FIG. 2, the catalyst combustion plate 20 of this example is configured such that 15 substantially square catalyst units 21 are arranged adjacent to each other in a plate shape in an array. Each catalyst unit 21 is in a state in which the edge of the catalyst plate 22 in which a catalyst such as platinum is supported on a carrier (for example, ceramic such as lime aluminate-dissolved silica-titanium oxide) is covered with a frame 30. A plurality of catalyst plates 22 are connected via a frame 30. Therefore, the vaporized liquid fuel supplied from the vaporizing chamber, which will be described later, is catalytically combusted in the catalyst plate 22, and the catalytic combustion plate 21 is heated to emit infrared rays.
[0014]
A vaporization chamber 12 that heats the liquid fuel 70 by the radiant heat 74 of the catalytic combustion plate 20 to bring it into a vaporized state is provided behind the catalytic combustion plate 20. The vaporization chamber 12 is a hollow space provided with a heat-resistant outer shell 11 such as SUS430 or aluminum-containing ferrite. Behind the vaporization chamber 12 is a fuel spray section 13 that sprays liquid fuel 70 supplied from a fuel tank (not shown) by a fuel pipe 8 and a fuel pump (not shown), and sends combustion air to the vaporization chamber 12. A blower 15 is arranged. The fuel spraying section 13 functions as a burner when preheating the vaporizing chamber 12 and the catalytic combustion plate 20 (preliminary combustion), and can ignite the sprayed liquid fuel by an igniter (not shown). In the vaporizing chamber 12, a ceramic porous radiation plate 19 is disposed so as to face the rear surface 20 b of the catalytic combustion plate 20 and face the catalytic combustion plate 20 substantially in parallel. Since the radiation plate 19 receives the radiant heat 74 of the catalytic combustion plate 20 and is maintained in temperature, it is possible to promote the vaporization of the fuel supplied to the vaporizing chamber 12 and stably maintain the catalytic combustion. Have a role.
[0015]
In the catalytic combustion device 5, in order to perform catalytic combustion on the catalytic combustion plate 20, prior to catalytic combustion, preliminary combustion is performed using the fuel spray portion 13 as a burner, and the vaporization chamber 12, the radiation plate 19, and the catalytic combustion plate 20. Heat. When the temperature of the catalytic combustion plate 20 reaches an activation temperature of about 300 to 400 ° C. and the temperature of the vaporization chamber 12 also rises, the supply of fuel is once stopped and combustion is stopped. Thereafter, the fuel is again supplied to the fuel spraying section 13 and the atomized liquid fuel is ejected into the heated vaporizing chamber 12. The vaporized fuel (mixed gas) 71 is oxidized (catalytic combustion) by the action of the catalyst of the catalytic combustion plate 20, and infrared rays 74 are emitted from the emission surface 20 a of the catalytic combustion plate 20. For this reason, the catalytic combustion apparatus 5 of this example has a function as a large-capacity infrared heater.
[0016]
Therefore, the size (size, especially area) of the catalytic combustion plate 20 is selected based on the thermal load required as a heater, and when it is used for the purpose of heating a large space such as a factory, it generates a large amount of heat. Since the amount is desired, it is required to have a large catalytic combustion plate that has a large contact area with the vaporized fuel. However, the catalyst plate 22 is mostly made of ceramic as described above, and it is difficult to form the plate 22 having a large area from a single point in terms of yield. For this reason, like the catalyst combustion plate 20 of this example, a catalyst combustion plate having a large area is formed by arranging a plurality (15) of the catalyst units 21 in a two-dimensional array.
[0017]
3 and 4 show the configuration of the catalyst unit 21 of this example. 3A is a plan view of the catalyst unit 21 viewed from the front, that is, the front 20a, and FIG. 3B is a view viewed from the back 20b, that is, the direction of the vaporizing chamber 12. FIG. 3C is a diagram showing a side surface 21 a of the catalyst unit 21, that is, a portion in contact with the adjacent catalyst unit 21. Further, FIG. 4 shows an overall configuration using a cross section of the catalyst unit 21.
[0018]
The catalyst unit 21 includes a substantially square catalyst plate 22 and a frame 30 having a shape along the edge 22 b, and a gasket 50 is sandwiched between the catalyst plate 22 and the frame 30. As shown in FIG. 6, the frame 30 is made of metal (SUS), and has a frame 33 that supports a portion 33 that covers the side surface of the catalyst plate and the front 20 a of the catalyst plate 22 along the edge 23 a of the surface 23. The front plate 31 includes a claw 32-like portion that intermittently supports the rear surface 20b (back surface) 25 of the catalyst plate 22. The front plate 31 and the claw 32 support the front surface 22 and the rear surface of the catalyst plate 22. 25 can be supported. The frame 30 of this example is provided with two claws 32 at two places per side of the catalyst plate 22.
[0019]
The side portion 33 of the frame 30 is a portion adjacent to the other frame 30. In the frame 30 of this example, along each of the four side surfaces, along the frame 30, that is, in the longitudinal direction of the side portion 33. Two elongated seal holes 35 extending along the line are formed.
[0020]
When the catalyst plate 22 is fitted into the frame 30, a gasket 50 is installed between them, in particular, between the catalyst plate 22 and the side portion 33 of the frame 30, and in the catalyst plate 22 of this example, A thermally expandable gasket is employed as the gasket 50. The heat-expandable gasket 50 is a material containing an overheat expansion material that expands about 3 to 4 times in the thickness direction when heated, such as an interlam mat manufactured by Sumitomo 3M. Therefore, in the catalyst unit 21 of this example, when the catalyst plate 22 is fitted in the frame 30 and heated, the thermally expandable gasket 50 expands, filling the space between the frame 30 and the catalyst plate 22, and the side surface of the frame 30. Since the seal hole 35 is opened in the portion 33, the thermal expansion gasket 50 is expanded from the seal hole 35 toward the other catalyst unit 21 adjacent to the outside, that is, the adjacent catalyst unit 21. As a result, the space between the adjacent catalyst units 21 is filled with the thermally expandable gasket 50, and the contact strength is increased when the thermally expandable gaskets 50 are in close contact with each other.
[0021]
This is shown in FIG. As shown in FIG. 5A, before heating, in the state where the catalyst plate 22 is fitted inside the frame 30 via the thermally expandable gasket 50, there is a gap C inside the frame 30, The seal hole 35 is also left open. On the other hand, when the combustion test is performed by incorporating the catalytic combustion plate 20 into the housing 10 before the product is shipped, the thermally expandable gasket 50 expands as shown in FIG. For this reason, there is no gap inside the frame 30, and the seal hole 35 is also filled with the expanded thermal expansion gasket 50. Then, the thermally expandable gasket 50 swelled from the adjacent catalyst unit 21 through the seal hole 35 comes into contact, and the pressing force works. Therefore, a gap between the inside of the catalyst unit 21 and between the adjacent catalyst units 21 is sealed, the catalyst plate 22 is fixed, and the strength of the catalyst combustion plate 20 in which the plurality of catalyst units 21 are combined is also increased.
[0022]
The assembly of the catalytic combustion plate 20 will be described with reference to FIG. First, a predetermined number of the individual frames 30 shown in FIG. 6 are arranged, for example, 15 as shown in FIG. Then, the adjacent frames 30 are fixed by performing spot welding 39 at the center of each side. For this reason, the seal hole 35 provided in the side portion 33 of each frame 30 is divided into two for each side, and there is no seal hole 35 in the center 33a of each side portion 33. Therefore, when this portion 33a is spot-welded and adjacent frames 30 are connected, each frame 30 is unlikely to be distorted or deformed. In this way, the frame 29 of the catalytic combustion plate 20 is formed, in which 15 adjacent frames 30 are connected to each other to form one catalytic combustion plate 20. In this example, the frame 29 for the catalytic combustion plate is formed by spot welding at 22 locations.
[0023]
Next, the catalyst plate 22 is put in each frame 30, and the thermally expandable gasket 50 is put in the gap between the catalyst plate 22 and the frame 30. Then, when the claw 32 of the frame 30 is bent inward, the catalyst plate 22 and the thermally expandable gasket 50 are pressed front and back by the front pressing 31 and the claw 32 and temporarily fixed at a predetermined position of the frame 30. In this state, the catalyst combustion plate 20 in which a predetermined number of catalyst plates 22 are arranged in a plane is assembled. However, as shown in FIG. 5A, there is a gap C in this state, and there is also a gap between the frames.
[0024]
The catalytic combustion apparatus 5 as shown in FIG. 1 is assembled using the catalytic combustion plate 20 in this state. The plurality of catalyst plates 22 can be handled as a single catalyst combustion plate 20 by being put in the frame 30, and the catalyst combustion device 5 can be assembled without any particular problem by a normal assembly method. The catalytic combustion apparatus 5 assembled in this way is actually supplied with fuel and subjected to a combustion test before shipment. Accordingly, at that time, the vaporization chamber 12 is preheated, and further, when the catalyst plate 22 reaches a predetermined temperature, catalytic combustion is actually performed. For this reason, the catalyst plate 22 and its periphery become high temperature, and the thermally expandable gasket 50 expands.
[0025]
As a result, as shown in FIG. 5B, the thermally expandable gasket 50 expands about 3 to 5 times, the gap between the catalyst plate 22 and the frame 30 is filled, and further expands into the seal hole 35 as well. By doing so, the gap between the frames 30 is filled. Further, the thermally expandable gasket 50 is brought into close contact between the frames 30, and is in a state of being pressurized or compressed with each other. Therefore, the connection strength between the frames is increased, and the strength as the catalyst combustion plate 20 is also improved.
[0026]
Thus, in the catalytic combustion apparatus 5 of this example, when the combustion test is performed at the factory shipment stage, the clearance between the catalytic combustion plates 20, that is, the clearance between the plurality of catalyst plates 22 arranged in the plane direction and the frame 30, and the frame The gap between each other can be reliably sealed. Therefore, when the user actually uses the catalytic combustion apparatus 5 of this example, the liquid fuel can be vaporized and catalytically combusted by the catalytic combustion apparatus 5 without a gap where the gas leaks. For this reason, the fuel can be stably catalytically burned in a state where the original merit of catalytic combustion with good combustion efficiency and clean exhaust gas is fully utilized.
[0027]
Also, the thermally expandable gasket 50 tends to expand when it is repeatedly exposed to high temperatures. Therefore, unlike a normal gasket, repeated use of the combustion device does not cause a gradual thinning and generation of a gap. Further, when heating and catalytic combustion, the catalyst plate 22 repeats expansion and contraction, but in the expanded state, the catalyst plate 22 is merely in contact with the expanded thermal expansion gasket 50 at an appropriate pressure. Will not occur. And even if a slight gap is opened between the thermally expandable gasket 50 when the temperature is reduced and contracted, there is no problem because it is supported by the front press 31 and the claws 32 of the frame 30. Therefore, in the catalytic combustion plate 20 and the catalytic combustion apparatus 5 of this example, even if the catalyst plate 22 repeats expansion and contraction, it is not damaged, and further, no gap is generated in the combustion state. .
[0028]
The thermally expandable gasket 50 may generate an odor when initially expanded. However, in the catalytic combustion apparatus of this example, as described above, when performing a combustion test in a factory, the thermally expandable gasket 50 is used. Is temporarily expanded, there is no problem that a smell is generated from the thermally expandable gasket when the user actually uses it. Therefore, in the catalytic combustion apparatus of this example, paying attention to the catalytic combustion plate 20 being appropriately heated in the combustion test before shipping, the final assembly is completed and the sealing performance is exhibited. ing. Further, since the thermally expandable gasket is in an expanded state when shipped, the strength of the catalytic combustion plate is sufficiently high, and the rattling of the catalyst plate is also small. Therefore, troubles such as damage to the catalyst plate during the distribution process can be prevented.
[0029]
Thus, in the catalytic combustion apparatus 5 of the present example, any number of the plurality of catalyst plates 22 can be arranged in the plane direction by the above-described configuration and process, and at least during combustion, unburned components are released. The gap can be eliminated, and the catalyst plate can be prevented from being damaged by expansion and contraction. Therefore, it is possible to actually supply a large-scale catalytic combustion device that requires a large calorific value, a large-capacity catalyst that takes advantage of catalytic combustion, such as high combustion efficiency, safety, and low harmful emissions. The combustion device 5 can be provided.
[0030]
Furthermore, each catalyst plate 22 is individually held by a frame 30 via a thermally expandable gasket 50 to form a catalyst unit 21, and a catalyst combustion plate 20 capable of exhibiting a desired heat generation amount by arranging them appropriately is provided. can do. And in the catalyst combustion plate 20 of this example, a catalyst combustion plate can be comprised by connecting the flame | frame 30 of the catalyst unit 21 easily by spot welding. For this reason, the number and arrangement of the catalyst plates 22 can be freely selected, and it is possible to manufacture catalytic combustion apparatuses having various outputs and designs, and the degree of freedom in designing the catalytic combustion apparatus 5 can be increased.
[0031]
In the above description, an example in which 15 catalyst units 21 are used as the catalyst combustion plate 20 has been described, but the number (area) or shape is not limited to this. Further, the shape of the catalyst unit and the catalyst plate may be surrounded by a curved line such as a circle, but a polygonal shape is preferable in consideration of arranging a large number of adjacent plates. Therefore, although a rectangular plate is employed in this example, it may be a triangle or a polygon that is a pentagon or more.
[0032]
Further, spot welding is employed as a method for connecting the catalyst units, but it is of course possible to fix them using screws or the like. However, spot welding with good working efficiency is desirable, and even if a gap occurs at the stage of spot welding, the catalytic combustion plate of this example has the desired performance because the gap between the frames is filled with a thermally expandable gasket. It is possible to provide a catalytic combustion plate and a catalytic combustion apparatus.
[0033]
【The invention's effect】
As described above, in the catalyst unit and the catalyst combustion plate of the present invention, the catalyst plate is individually held by the frame, and further, by adopting a thermally expandable gasket that expands when exposed to high temperatures, Prevents gaps in the frame. Further, by providing the seal hole, the gap between the frames can be similarly prevented by the thermally expandable gasket. Therefore, in order to ensure a large output by catalytic combustion, even when a large number of catalyst plates are arranged, it is possible to prevent unburned fuel from being released from the gap and causing various troubles. Since the vaporized fuel can be reliably supplied to the catalyst plate, a catalytic combustion apparatus with higher combustion efficiency can be provided. For this reason, according to the present invention, it is possible to provide a high-power catalytic combustion apparatus utilizing the merit of catalytic combustion with good combustion efficiency and clean and stable combustion.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a schematic configuration of a catalytic combustion apparatus using a catalytic combustion plate according to the present invention.
2 is a plan view showing a configuration of a catalytic combustion plate shown in FIG. 1. FIG.
3 is a diagram showing a schematic configuration of a catalyst unit constituting a catalyst combustion plate, FIG. 3 (a) shows a front surface of the catalyst unit, FIG. 3 (b) shows a back surface of the catalyst unit, and FIG. The side of the catalyst unit is shown in c).
4 is a cross-sectional view showing a configuration of a catalyst unit shown in FIG.
5 is an enlarged cross-sectional view showing a portion where the catalyst unit shown in FIG. 3 is connected. FIG. 5 (a) shows a state immediately after the assembly of the catalyst combustion plate, and FIG. 5 (b) shows a combustion state. The state after performing the test is shown.
6 is a diagram showing a schematic configuration of a frame used in the catalyst unit shown in FIG. 3. FIG. 6 (a) is a front view, and FIGS. 6 (b), (c), (d) and (e) It is a side view.
7 is a diagram showing a state in which a plurality of frames shown in FIG. 6 are connected to form a frame for a catalytic combustion plate, FIG. 7 (a) is a front view, and FIG. 7 (b) is a side view in the longitudinal direction; FIG. 7C is a side view in the short direction.
[Explanation of symbols]
5 catalytic combustion apparatus 10 housing 10a housing front 11 vaporization chamber outer shell 12 vaporization chamber 13 fuel spray section 15 blower 19 radiation plate 20 catalyst combustion plate 21 catalyst unit 22 catalyst plate 23 catalyst plate front surface 25 catalyst plate back surface 29 catalyst combustion Plate frame 30 Catalyst unit frame 31 Front presser 32 Claw 35 Seal hole 39 Spot welding portion 50 Thermal expansion gasket 70 Liquid fuel (kerosene)
71 Mixture 73 Infrared ray 74 radiated heat

Claims (4)

A catalyst plate for catalytic combustion of vaporized fuel;
A metal frame shaped along the edge of the catalyst plate,
The catalyst plate is fitted into this frame via a thermally expandable gasket ,
The catalyst plate has a polygonal shape in which a plurality of the catalyst plates can be arranged adjacent to each other, and a seal hole where the thermally expandable gasket is exposed is formed along the frame in a portion where the frame is adjacent to another frame. catalyst unit, characterized in that is.   2. The catalyst unit according to claim 1, wherein the frame includes a front pressing member that supports the front surface of the catalyst plate along an edge thereof, and a claw that intermittently supports the rear surface of the catalyst plate. A catalytic combustion plate , wherein a plurality of the catalyst units according to claim 1 or 2 are arranged in an array . A catalytic combustion apparatus comprising: the catalytic combustion plate according to claim 3; and a vaporizing chamber for vaporizing and supplying liquid fuel to the catalytic combustion plate.

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