JP2004191049A - Combustion control method of catalyst combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion control method of a catalyst combustion device capable of stably continuing the catalyst combustion by supplying the sufficiently vaporized liquid fuel to a catalyst layer with a simple constitution. <P>SOLUTION: A porous radiation plate faced to the catalyst layer is mounted in a vaporizing chamber 12 of the catalyst combustion device. The radiation plate 30 is heated by the radiation heat 74 from the catalyst layer 20. The liquid fuel having passed through the vaporizing chamber 12, passes through the radiation plate 30 in an atomized state or during its vaporization. The radiation plate 30 is used as a heat source in the vaporizing chamber and accelerates the vaporization. The fuel in the atomized state or during its vaporization having passed through the radiation plate 30 is brought into contact with the radiation plate 30, whereby the heat is conducted, the fuel is heated, and the vaporization is accelerated. By mounting the radiation plate 30, the vaporization of the liquid fuel 70 in the vaporizing chamber can be accelerated, and the catalyst combustion can be stably kept. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a combustion control method for a catalytic combustion device that catalytically combusts vaporized liquid fuel.

  2. Description of the Related Art Catalytic combustion, in which the combustion temperature is lower than flame combustion and burns without flame, is known. Further, catalytic combustion generates less harmful exhaust gas such as NOx. In addition, there are various advantages such as the ability to burn a lean air-fuel mixture, a wide range of adjustment of the amount of combustion, and a large amount of radiant heat.

  It has been studied to use this catalytic combustion in a heating device that emits warm air or infrared rays. 2. Description of the Related Art In a device for catalytic combustion of a liquid fuel, there is a catalytic combustion device in which a catalyst layer is provided in front and a vaporization chamber for vaporizing sprayed fuel is disposed behind the catalyst layer. In this catalytic combustion device, when catalytic combustion is started, the vaporization chamber is heated by the heat (radiant heat) of the catalytic layer, and the liquid fuel is vaporized and supplied to the catalytic layer in a state of being mixed with air. Is continued.

  However, in catalytic combustion, catalytic combustion does not proceed efficiently unless sufficiently vaporized fuel is supplied to the catalyst layer. In addition, when a liquid fuel that is insufficiently vaporized is supplied to the catalyst layer, there is a problem that the catalyst layer is wetted and the activity is reduced. Therefore, it is necessary to sufficiently heat the vaporization chamber. However, if the temperature of the catalyst layer is designed to be high in order to increase the temperature of the vaporization chamber, a so-called flashback phenomenon occurs in which fuel burns in the catalyst layer or the vaporization chamber with flame. When the flashback phenomenon occurs, the original effect of catalytic combustion cannot be obtained.

  If the volume of the vaporization chamber is reduced instead of raising the temperature of the catalyst layer, the temperature in the chamber increases, but the residence time for vaporization is not taken. Although it is possible to provide a heat source such as an electric heater instead of using the catalyst layer as a heat source, a running cost is required.

  As described above, in order to generally use catalytic combustion in a heating appliance or the like, it is important to supply a sufficiently vaporized fuel to the catalyst layer continuously and stably. However, up to now, there has not been provided an appropriate configuration which promotes vaporization, has a simple structure and does not cost much running.

  Accordingly, an object of the present invention is to propose a combustion control method for a catalytic combustion device that can supply a sufficiently vaporized liquid fuel to a catalyst layer with a simple configuration and continue catalytic combustion stably.

  For this reason, in the present invention, by providing a porous radiant plate heated by radiant heat from the catalyst layer in the vaporization chamber, the fuel being vaporized contacts the radiant plate that has become hot, so that vaporization is promoted. I have to.

That is, the present invention provides a catalyst layer that catalytically burns a vaporized liquid fuel, a vaporization chamber that vaporizes the liquid fuel by radiant heat of the catalyst layer and supplies the vaporized liquid fuel to the catalyst layer in front, and sprays the liquid fuel into the vaporization chamber. And a porous radiating plate disposed in the vaporization chamber so as to face the catalyst layer, wherein the radiating plate is heated by radiant heat from the catalyst layer and sprayed into the vaporization chamber. A combustion control method for a catalytic combustion device that functions as a heat source that promotes vaporization of a liquid fuel,
By performing preliminary combustion by forming a flame in the vaporization chamber using the sprayer as a burner, the vaporization chamber, the radiation plate and the catalyst layer are heated,
Stopping the preliminary combustion after the temperature of the vaporization chamber is equal to or higher than a predetermined value,
Thereafter, liquid fuel is sprayed from the sprayer into the vaporization chamber to start catalytic combustion by the catalyst layer,
At the time of catalytic combustion, the liquid fuel sprayed into the vaporization chamber is vaporized by radiant heat emitted from the catalyst layer and transmitted through the radiant plate, and radiant heat of the radiant plate, and supplied to the catalyst layer. It is characterized by.

  By providing a porous radiating plate in the vaporization chamber so as to face (facing or confront) the catalyst layer, a sufficiently vaporized fuel is supplied to the catalyst layer, which is extremely favorable. It has been found from experiments conducted by the present inventors that catalytic combustion is maintained stably and stably.

  The factors that promote the vaporization by providing the radiating plate and can maintain the catalytic combustion satisfactorily and stably are considered as follows. First, the radiant plate is heated to a high temperature by radiant heat from the catalyst layer. Then, the liquid fuel passing through the vaporization chamber passes through the radiation plate in an atomized state or in a state of being gasified. Therefore, the radiation plate becomes a heat source in the vaporization chamber and promotes vaporization. At the same time, since the radiation plate is porous, there is a high probability that the atomized or vaporized fuel will come into contact with the radiation plate, and the contact will transfer heat and the fuel will be heated to a higher temperature to promote vaporization. On the other hand, because of the porosity, part of the radiant heat of the catalyst layer passes through the radiator plate and reaches the rear (upstream side) on the fuel supply side of the vaporization chamber, and also heats the entire vaporization chamber. Therefore, the vaporization efficiency of the entire vaporization chamber is improved by installing the radiation plate.

  Further, it is considered that the radiation plate plays a good function also for mixing the combustion air with the vaporized or evaporating fuel. That is, turbulence is likely to occur when the fuel passes through the porous radiating plate, so that mixing of fuel and air proceeds, and fuel is supplied to the catalyst layer in a sufficiently mixed state. As a result, the catalyst layer is in a state where uniform catalytic combustion can be stably maintained. Further, the combustion air is also heated by the radiation plate. Therefore, vaporization is also promoted by mixing the hot air and the gasifying fuel.

  Further, in the space between the radiation plate and the catalyst layer in the vaporization chamber, the fuel and the combustion air are exposed not only to the radiation heat from the catalyst layer but also to the radiation heat from the radiation plate. Therefore, although the capacity is not large, a space that is easily heated to such a high temperature is formed in front of the catalyst layer, so that the vaporization of the fuel is rapidly promoted, and the sufficiently heated fuel and air are removed. It will be supplied to the catalyst layer. Therefore, it is considered that stable catalytic combustion can be maintained due to the above-described factors due to the provision of the radiation plate.

  As described above, in the combustion control method of the catalytic combustion device of the present invention, since the catalytic combustion can be performed stably, the merit of the catalytic combustion can be fully utilized, and the advantage can be obtained by actually using it in a home such as a heating device. Alternatively, it can be used for devices used in factories and the like. Although there are many merits of catalytic combustion, for example, emission of toxic or odor-causing components in combustion exhaust gas such as nitrogen oxides or carbon monoxide can be reduced, and noise can be reduced as compared with flame combustion. These merits show that the catalytic combustion method of the present invention is suitable for use in a heating device or the like. Further, the catalytic combustion has many advantages such as the ability to burn a lean mixture, a wide range of adjustment of the amount of combustion, and a large amount of radiant heat due to good combustion efficiency.

  The porous radiation plate may be a metal plate such as a punching metal, but is preferably ceramic or a metal plate obtained by spraying ceramic. Ceramics have high strength at high temperatures and high absorptivity of infrared rays, so that the temperature of the radiation plate can be easily raised.

  By providing the radiation plate, the above-described effects can be obtained.However, if the aperture ratio of the radiation plate is too small, the contact efficiency with the fuel is high, and the vaporization efficiency of the fuel is considered to be improved. Since the radiant heat transmitted through the radiation plate is reduced, the temperature of the vaporization chamber may decrease, and the vaporization efficiency of the entire vaporization chamber may decrease. If the vaporization efficiency of the vaporization chamber is too low, the vaporization of the fuel becomes insufficient and the combustion cannot be continued. On the other hand, if the aperture ratio of the radiation plate is large, the contact efficiency with the fuel decreases, and the effect of improving the vaporization efficiency of the fuel decreases. At the same time, if the aperture ratio is large, the temperature of the vaporization chamber rises, and a high-temperature radiating plate is disposed there, which may cause a flashback phenomenon. From such a viewpoint, the inventors of the present application conducted an experiment, and obtained a result that the aperture ratio of the radiation plate is desirably in the range of about 30% to 60%.

  Further, it is desirable that the atomizer for spraying the liquid fuel, the radiation plate, and the catalyst layer are arranged substantially linearly such that the respective centers are on the central axis of the vaporization chamber. As described above, by adopting an arrangement that is axially symmetric with respect to the direction in which the liquid fuel flows, it is possible to prevent the fuel and the air from drifting. Therefore, the vaporized fuel and the mixed air can be evenly distributed and supplied to each part of the catalyst layer (for example, the surface facing the vaporization chamber), and stable catalytic combustion can be continued in the entire catalyst layer. be able to.

  The size (area) of the catalyst layer is selected based on the heat load. On the other hand, since the cross-sectional area of the vaporization chamber is determined by the amount of supplied liquid fuel and the amount of air, the cross-sectional area may be smaller than the area of the catalyst layer. In this case, a difference occurs in the cross-sectional area between the catalyst layer and the vaporization chamber. Therefore, it is preferable that the vaporization chamber is formed so as to expand in a tapered shape near the catalyst layer. In this manner, by eliminating the step in the shape of the vaporization chamber, it is possible to avoid drift in the vaporization chamber, particularly in a region along the wall surface of the vaporization chamber, and to help uniform the thermal load of the catalyst layer. In such a vaporization chamber, the radiation plate can be made smaller by arranging the radiation plate behind the tapered portion of the vaporization chamber.

  Further, it is desirable that the catalyst layer is formed, for example, in a radial polyhedron so that the front from which heat is output becomes convex. Thereby, the radiation angle of the heat (infrared ray) output forward from the catalyst layer is widened, and the external object can be efficiently heated.

  As described above, the combustion control method of the catalytic combustion device of the present invention, by providing a porous radiant plate in the vaporization chamber facing the catalyst layer, high temperature due to radiant heat provided a new heat source in the vaporization chamber, Thereby, the vaporization of the liquid fuel reaching the catalyst layer and the mixing with the air are promoted. Therefore, according to the method of the present invention, the catalyst layer can be almost completely vaporized, the fuel mixed with the air can be supplied, and the catalytic combustion can be stably continued with a simple configuration in which the radiation plate is provided in the vaporization chamber. A catalytic combustion device can be realized.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an outline of a heating apparatus to which the method of the present invention is applied. The heating device 1 of the present example is a heating device using the catalytic combustion device 5 adopting the combustion control method according to the present invention as a heat source.

  The heating device 1 has a catalytic combustion device 5 mounted above a frame 60 with movable casters. The fuel tank 2 is further attached to the frame 60 below the catalytic combustion device 5, and these can be integrally moved and moved to an appropriate place. Therefore, it is possible to operate the catalytic combustion device 5 at an appropriate place to radiate the infrared rays 73 and perform heating. Further, by changing the direction of the frame 60, the radiation direction of the infrared rays 73 can be adjusted.

  The catalytic combustion device 5 of the present example includes a cylindrical housing 10 extending in the horizontal direction. The housing 10 is mounted on the arm 62 so as to be pivotable in the vertical direction, and is supported by the frame 60. The front 10a of the housing 10 is an infrared radiation surface 21 that outputs the infrared light 73. In this example, a plurality of plate-shaped catalyst plates are radially combined to form a polyhedral radiation surface 21 so that the infrared radiation surface 21 is convex toward the front 10a. By providing the infrared radiation surface 21 in this way, the radiation angle of the output infrared radiation 73 is widened, and efficient heating can be performed. In addition, a guard 69 is attached in front of the infrared radiation surface 21 for safety.

  FIG. 2 is a cross-sectional view illustrating a schematic configuration of the catalytic combustion device 5 of the present example. In the catalytic combustion device 5 of this example, a catalyst layer 20 is provided facing the outside (front) 10a, and a surface appearing outside the catalyst layer 20 is an infrared radiation surface 21. The catalyst layer 20 of this example is composed of a catalyst such as platinum and a carrier thereof (for example, ceramics such as lime aluminate-dissolved silica-titanium oxide). The catalyst layer 20 of this example has a honeycomb shape, an opening ratio of about 50% to 70%, and a thickness of about 5 to 20 mm.

  Behind the catalyst layer 20, a vaporization chamber 12 for heating and vaporizing the liquid fuel 70 by the radiant heat 74 of the catalyst layer 20 is provided. The vaporization chamber 12 is constituted by a cylindrical outer shell 11 made of a heat-resistant material such as SUS430 and aluminum-containing ferrite, and evaporates the liquid fuel in the internal space. Further, the vaporization chamber 12 becomes a combustion chamber at the time of preliminary combustion described later.

  Behind the vaporizing chamber 12, a sprayer (burner) 13 for spraying the fuel pipe 8 and a liquid fuel 70 supplied by a fuel pump (not shown) from the fuel tank 2, and a blower 15 for sending combustion air to the vaporizing chamber 12. Is arranged. The atomizer 13, the air outlet of the blower 15, the radiating plate 30 and the catalyst layer 20, which will be described later, have their respective centers aligned with the central axis 19 of the vaporizing chamber 12, and are arranged substantially linearly and axially symmetrically. I have.

  The atomizer 13 functions as a burner 13 at the time of preliminary combustion for preheating the vaporization chamber 12 and the catalyst layer 20 prior to catalytic combustion. Therefore, an igniter 14 for igniting the liquid fuel is provided adjacent to the burner 13.

  Further, in the catalytic combustion device 5 of the present example, a porous radiating plate 30 is arranged in the vaporization chamber 12 so as to face (face) the rear surface 22 of the catalyst layer 20 and to face the catalyst layer 20 substantially in parallel. ing. The radiating plate 30 is a disk-shaped plate as shown in FIG. 3, and a plurality of holes 31 are formed almost uniformly radially from the center 30a. The illustrated radiation plate 30 is a disk having a diameter of about 150 mm, has 106 holes 31 with a diameter of 10 mm, and an aperture ratio of about 45%. The radiation plate 30 is made of a member obtained by spraying ceramic onto a punching metal. Since ceramic has high strength at high temperature, it is excellent as a material of a member installed in a place where the temperature is high when irradiated by the catalyst layer 20. Further, since ceramic has a high infrared absorptivity, it is most suitable as a material of the radiating plate 30 which is desirably heated to high temperature by radiant heat from the catalyst layer 20.

  The position of the radiation plate 30 in the vaporization chamber 12 is a position facing the catalyst layer 20 between the front catalyst layer 20 and the rear sprayer 13. At the same time, the catalyst in the vaporization chamber 12 is formed so that the radiant plate is easily heated to a high temperature by the radiant heat from the catalyst layer 20 and the liquid fuel in a certain vaporized state is easily completely vaporized by the radiant plate 30. It is provided at a position near the layer 20. That is, the vaporizing chamber 12 is divided into two by the radiation plate 30, but the length W1 of the rear space 12a where the atomizer 13 is arranged is equal to the length W2 of the front space 12b facing the catalyst layer 20. The radiation plate 30 is arranged to be longer.

  The rear space 12a is a region that is heated by the radiation transmitted from the radiator plate 30 and the radiant heat of the radiator plate 30 and becomes high temperature among the heat radiated from the catalyst layer 20, and the fuel 71 sprayed from the sprayer 13 is heated. Is vaporized by the heat of the space 12a and mixed with combustion air supplied from the rear blower 15 (primary mixing).

  The gas (fuel and air) primarily mixed in the space 12a passes through the heated radiation plate 30. At this time, the vaporization of the liquid fuel being vaporized is promoted by passing through the porous radiating plate 30 by several processes as described above.

  The mixed gas that has passed through the radiating plate 30 is promoted to mix by passing through the porous radiating plate 30 in the front space 12b, and is further promoted to be vaporized by the radiant heat 74 of the catalyst layer 20. . Further, the temperature of the mixed gas itself becomes high (secondary mixing). According to such a process, in the combustion device 5 of this example, the liquid fuel can be almost completely vaporized in the vaporization chamber 12 and supplied to the rear surface 22 of the catalyst layer in a state of being mixed with air. The layer 20 provides a stable and stable catalytic combustion.

  Therefore, as compared with a conventional catalytic combustion apparatus in which a vaporization chamber is simply provided, it is possible to eliminate a trouble that the catalytic reaction does not proceed smoothly because the fuel that has reached the catalyst layer is not vaporized. In addition, since it is sufficiently mixed with combustion air, uneven combustion may occur in the catalyst layer, and a large temperature distribution may occur in the catalyst layer, which may cause flashback. Can be prevented. As described above, the catalytic combustion device 5 of the present example can supply the almost completely vaporized fuel to the catalyst layer 20 with a simple configuration in which the radiation plate 30 is provided in the vaporization chamber 12 and can continue stable catalytic combustion. It is a catalytic combustion device.

  Further, in the catalytic combustion device 5 of the present example, the atomizer 13, the radiation plate 30 and the catalyst layer 20 are arranged substantially linearly such that the respective centers are on the central axis 19 of the vaporization chamber 12. By adopting such an axially symmetric arrangement, it is possible to avoid the occurrence of drift in the vaporization chamber 12. Therefore, the gaseous mixture 72 in which the vaporized fuel and air have been mixed can be uniformly dispersed and supplied to the catalyst layer 20. For this reason, it is possible to equalize the heat load of the catalyst layer 20, and to equalize the distribution of infrared rays emitted from the radiation surface 21. At the same time, since a large temperature distribution can be prevented from being generated in the catalyst layer 20, an effect of preventing occurrence of flashback can be obtained.

  Further, as shown in FIG. 2, the catalytic combustion device 5 of this example is a device in which the area of the catalyst layer 20 is larger than the vertical cross-sectional area of the vaporization chamber 12. The outer shell portion 11a of the vaporization chamber to be formed is tapered. Therefore, the mixed gas 72 supplied to the catalyst layer 20 also flows along the outer shell 11 along the tapered portion 11a, and has a structure in which a large drift is unlikely to occur. Therefore, although the configuration is such that the area of the catalyst layer 20 and the cross-sectional area of the vaporization chamber 12 are different, large drift can be prevented, and the above-described effects can be obtained.

  Since the size of the catalyst layer 20 is selected based on the calorific value (heat load), the surface area does not always match the cross-sectional area of the vaporization chamber 12. In this example, since the area of the catalyst layer 20 is large, the catalyst layer 20 is arranged in a horizontally long rectangle, and is arranged so that the central axis 19 of the cylindrical vaporization chamber 12 is aligned with the center 20a of the catalyst layer 20. By expanding the vicinity of the catalyst layer 20 in a tapered shape, the catalytic combustion device 5 that is compact, has less drift, and can obtain a uniform thermal load is realized.

  The tapered position is not particularly limited to the above, but is preferably a position close to the catalyst layer 20 in order to make the vaporization chamber 12 compact. Furthermore, the size of the radiation plate can be reduced by disposing the tapered portion in front of the radiation plate 30, or conversely, by disposing the radiation plate 30 behind the tapered portion 11 a. .

  As described above, in the catalytic combustion device 5 of the present embodiment, by providing the radiation plate 30 behind the catalyst layer 20, the catalytic combustion is stably maintained. Therefore, the configuration of the catalytic combustion device is simple, and the number of operating components does not increase. Therefore, the cost is low, the control is simple, and the maintenance can be easily performed. Further, there is no need to prepare another heat source such as an electric heater to heat the vaporization chamber in order to promote vaporization during catalytic combustion, and no extra running cost is generated.

  The catalytic combustion device 5 of this embodiment is controlled as follows. First, in order to start catalytic combustion in the catalyst layer 20, it is necessary to heat the catalyst layer 20 to an activation temperature of about 300 to 400C. At the same time, it is necessary to raise the temperature of the vaporization chamber 12 so that the liquid fuel is vaporized. For this reason, prior to catalytic combustion, a flame is formed in the vaporization chamber 12 using the atomizer 13 as a burner, and preliminary combustion is performed. The heat of the flame heats the vaporization chamber 12, the radiation plate 30, and the catalyst layer 20.

  When the temperature of the vaporization chamber 12 increases by the preliminary combustion, the ejection of the liquid fuel 70 is stopped to stop the preliminary combustion. Thereafter, after an appropriate interval, the liquid fuel 70 is again supplied to the atomizer 13 and the mist liquid fuel 71 is supplied to the heated vaporization chamber 12. Since the vaporization chamber 12 is heated including the radiation plate 30, as described above, the liquid fuel 71 is heated and vaporized in the vaporization chamber, mixed with air, and supplied to the catalyst layer 20. Since the catalyst layer 20 is also heated, a catalytic reaction is started, and as a result, the temperature of the catalyst layer 20 increases.

  Thus, once the catalytic reaction (catalytic combustion) starts in the catalyst layer 20, the radiant plate 74 and the vaporizing chamber 12 are heated by the radiant heat 74, and the catalytic combustion is maintained as described above. When stopping the catalytic combustion, the supply of the fuel may be stopped.

  As described above, the catalytic combustion device 5 of the present embodiment is a device that is easy to stably maintain the catalytic combustion by installing the radiating plate 30. However, as described above, the catalytic combustion device 5 depends on the aperture ratio of the radiating plate 30. The stable state of combustion may fluctuate. FIG. 4 shows an example of the experimental results of the radiation plate aperture ratio and the combustion state performed by the inventors of the present application. As can be seen from FIG. 4, when the aperture ratio of the radiation plate is in the range of 30% to 60%, the combustion state is good. The experimental results are in line with the above-described considerations relating to the aperture ratio of the radiation plate. If the aperture ratio is low, the temperature of the vaporization chamber 12 decreases and vaporization is likely to be incomplete. In this experiment, such a phenomenon is observed when the aperture ratio is 20%. On the other hand, when the aperture ratio is large, the temperature of the vaporization chamber 12 increases, and accordingly, the temperature of the radiation plate 30 also increases. For this reason, flashback combustion was observed when the opening ratio was 70%, indicating that it is better not to increase the opening ratio too much.

  Therefore, it is desirable to set the aperture ratio of the radiation plate 30 in the range of 30% to 60%. In the above description, a burner employing a radiation plate having an aperture ratio of 45% has been described as an example. However, an apparatus having an aperture ratio or an aperture ratio of about 45% is approximately in the middle of a range where the above-mentioned combustion state is favorable. Therefore, it is considered to be an extremely preferable value for adoption in an actual machine.

  As described above, the catalytic combustion device 5 according to the present embodiment can provide a device that can safely and stably maintain catalytic combustion. Therefore, it is possible to actually use catalytic combustion as a heat source for heating appliances, etc., and to use catalytic combustion with many advantages such as high safety, low harmful exhaust gas such as NOx, and quietness. It can be used in homes or factories.

  The arrangement of the atomizer 13, the radiation plate 30, and the catalyst layer 20 is not limited to this example. For example, an arrangement in which the catalyst layer is orthogonal to the central axis of the vaporization chamber is also possible. However, from the viewpoint of avoiding drift in the vaporization chamber as much as possible and equalizing the heat load of the catalyst layer, it is desirable to adopt the axially symmetric arrangement as described above.

  In the above description, the heating device 1 in which the infrared rays 73 are directly output to the outside world is described as an application example of the catalytic combustion device 5, but the application of the catalytic combustion device 5 is not limited to this. The catalytic combustion device of the present invention can be used as a heat source of various devices such as a hot air heating device, a dryer, and a heater of the type that produces and blows out hot air by the catalytic combustion device 5 of the present example.

FIG. 1 is a perspective view showing a schematic configuration of a heating device equipped with a catalytic combustion device to which the method of the present invention is applied. FIG. 2 is a longitudinal sectional view illustrating a configuration of the catalytic combustion device illustrated in FIG. 1. It is a top view of a radiation plate. 6 is experimental data showing the relationship between the radiation plate aperture ratio and the fuel state.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Heating device 2 Fuel tank 5 Catalytic combustion device 10 Housing 10a Housing front 11 Outer shell 11a of vaporization chamber 11a Tapered part 12 Vaporization chamber 13 Sprayer 15 Blower 19 Central axis 20 Catalyst layer 21 Infrared radiation surface 22 Rear surface 30 Radiation plate 31 Radiation Plate hole 60 Frame 62 Arm 69 Guard 70 Liquid fuel (kerosene)
71 Sprayed fuel 72 Mixed gas 73 Infrared ray 74 Radiant heat

Claims (1)

A catalyst layer that catalytically burns the vaporized liquid fuel, a vaporization chamber that vaporizes the liquid fuel by radiant heat of the catalyst layer, and supplies the vaporized liquid fuel to the front catalyst layer; a sprayer that sprays the liquid fuel into the vaporization chamber; A porous radiating plate disposed inside the chamber so as to face the catalyst layer, wherein the radiating plate is heated by radiant heat from the catalyst layer to promote vaporization of the liquid fuel sprayed into the vaporization chamber. A combustion control method for a catalytic combustion device functioning as a heat source to perform,
By performing pre-combustion by forming a flame in the vaporization chamber using the sprayer as a burner, the vaporization chamber, the radiation plate and the catalyst layer are heated,
Stopping the preliminary combustion after the temperature of the vaporization chamber is equal to or higher than a predetermined value,
Thereafter, liquid fuel is sprayed from the sprayer into the vaporization chamber to start catalytic combustion by the catalyst layer,
At the time of catalytic combustion, the liquid fuel sprayed into the vaporization chamber is vaporized by radiant heat emitted from the catalyst layer and transmitted through the radiant plate, and radiant heat of the radiant plate, and supplied to the catalyst layer. A combustion control method for a catalytic combustion device, comprising:

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