JP2004101054A - Catalytic reaction type heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a catalytic reaction type heating device capable of raising temperature of catalyst quickly when starting and suppressing exhaust of not yet reacted gas. <P>SOLUTION: This catalytic reaction type heating device is provided with a gas passage 2 for heating through which high temperature gas passes, a catalytic reaction part 20 reacting mixture gas composed of fuel and air by catalyst to generate high temperature gas, a heat medium circulation passage 40 through which heat medium passes, a heat exchange part 30 arranged on the downstream side of the catalytic reaction part 20 in the gas passage 2 for heating to transmit heat of high temperature gas to heat medium, and an opening and closing valve for letting mixture gas remain in the catalytic reaction part 20. The opening and closing valve 50 is provided on the downstream side of the heat exchange part 30 in the gas passage 2 for heating to let mixture gas remain in the catalytic reaction part 20 by closing the gas passage 2 for heating. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a catalytic reaction heating device that heats a heat medium using heat obtained by a catalytic reaction.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a catalytic reaction type heating device in which a mixture of fuel and air is subjected to a catalytic reaction, and a cooling medium is heated using a high-temperature gas obtained by the catalytic reaction. For example, in the catalytic reaction type refrigerant heating system described in JP-A-4-314613, a high-temperature gas is obtained in an upstream catalytic reaction section, and a heat exchange between the high-temperature gas and a cooling medium is performed in a downstream heat exchange section. To obtain warm water.
[0003]
However, in a catalytic reaction type heating device, the activity of the catalyst is generally low at a temperature lower than room temperature, and the catalytic reaction is slow. For this reason, a large amount of unreacted gas may be released at the time of startup, which is not preferable in terms of environmental conservation. To cope with such a problem, in the catalyst reaction type refrigerant heating system described in the above publication, a heating element that generates heat by electric energy is provided, and the heating element heats combustion air to indirectly heat the catalyst. It is configured.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional technology, there is a problem that a large amount of electric energy is consumed for heating the catalyst and the configuration is complicated. Therefore, it is not preferable in terms of cost and system efficiency.
[0005]
In view of the above, an object of the present invention is to provide a catalytic reaction-type heating device that can quickly raise the temperature of a catalyst at the time of startup and can suppress emission of unreacted gas.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a catalytic reaction heating device for heating a heat medium by utilizing a catalytic reaction, wherein a heating gas path (2) through which a high-temperature gas passes; A catalyst is provided in the heating gas path (2) and has a catalyst. The mixed gas of the fuel supplied from the fuel supply unit (11) and the air supplied from the air supply unit (12) undergoes a catalytic reaction. A catalyst reaction section (20) for generating a high-temperature gas, a heat medium path (40) through which a heat medium passes, and a downstream side of the catalyst reaction section (20) in the heating gas path (2) are provided. It is characterized by comprising a heat exchange section (30) for transferring heat to a heat medium, and a retaining means (50) for retaining the mixed gas in the catalytic reaction section (20).
[0007]
By causing the mixed gas to stay in the catalytic reaction section (20) in this way, the space velocity in the heating gas path (2) can be made apparently zero, and the supplied mixed gas can be effectively subjected to the catalytic reaction. Can be done. By this reaction heat, the temperature of the catalyst can be heated and the unreacted gas can be prevented from being discharged without providing a dedicated heat source for heating the catalyst.
[0008]
Specifically, as in the second aspect of the present invention, the heating gas path (2) provided on the downstream side of the heat exchange section (30) in the heating gas path (2) is used as the retaining means. By using the openable and closable on-off valve (50) and closing the heating gas path (2) by the on-off valve (50), the mixed gas can be retained in the catalyst reaction section.
[0009]
According to the third aspect of the present invention, the stagnation means supplies a predetermined amount of fuel from the fuel supply means (11) to the catalyst reaction section (20), and supplies the fuel from the air supply means (12) to the catalyst reaction section (20). ), The mixed gas is retained in the catalytic reaction section (20) until a predetermined time elapses after supplying a predetermined amount of air. As described above, the optimum time for retaining the mixed gas in the catalytic reaction section (20) can be set in advance. After the elapse of the predetermined time, the mixed gas has sufficiently catalyzed, and the catalyst temperature has risen to the activation temperature or higher.
[0010]
Further, in the invention according to claim 4, a heating medium supply means (42) is provided in the heating medium path (40) and supplies the heating medium to the heat exchange section (30). Is characterized in that the heating medium is not supplied to the heat exchange section (30) while the mixed gas is retained in the catalytic reaction section (20) by the retention means.
[0011]
In this way, by stopping the supply of the heat medium while the mixed gas is retained in the catalytic reaction section (20), it is possible to prevent the reaction heat of the mixed gas from being released to the outside of the apparatus, and to quickly The catalyst temperature can be raised.
[0012]
Further, in the invention according to claim 5, a fuel concentration detecting means which is arranged downstream of the catalytic reaction section (20) in the heating gas path (2) and detects the fuel concentration in the heating gas path (2). (61) control means (50) for controlling the staying means (50) so that the mixed gas stays in the catalytic reaction section (20) until the fuel concentration detected by the fuel concentration detecting means (61) becomes equal to or lower than a predetermined concentration. 60).
[0013]
As described above, by controlling the stagnation means based on the fuel concentration, the process from the warm-up mode to the normal operation mode can be accurately and promptly controlled.
[0014]
In the invention according to claim 6, the catalyst temperature detecting means (62) for detecting the catalyst temperature of the catalyst reaction section (20) and the catalyst temperature detected by the catalyst temperature detecting means (62) become equal to or lower than a predetermined temperature. And a control unit (60) for controlling the staying means (50) so that the mixed gas stays in the catalyst reaction unit (20).
[0015]
Thus, by controlling the staying means based on the catalyst temperature, the process from the warm-up mode to the normal operation mode can be accurately and promptly controlled.
[0016]
Further, in the invention according to claim 7, a mixed gas circulation path (51) that connects the upstream side and the downstream side of the catalytic reaction section (20) in the heating gas path (2), and a mixed gas path (51). And a mixed gas circulating means (52, 53) for circulating the mixed gas present in the heating gas path (2) to the catalytic reaction section (20) via the mixed gas circulating path (51). It is characterized by.
[0017]
By circulating the mixed gas in the catalytic combustion section (20) in this way, the diffusibility of the mixed gas can be improved, and the frequency of contact of the mixed gas with the catalyst can be increased. Further, the heat energy given to the mixed gas can be recovered by the catalyst, and the catalyst can be activated early.
[0018]
Further, in the invention described in claim 8, the mixed gas circulating means includes at least one of fuel supplied from the fuel supply means (11), air supplied from the air supply means (12), or a mixed gas thereof. An ejector (53) for circulating a mixed gas through a mixed gas path (51) using fluid energy is characterized.
[0019]
With such a configuration, it is not necessary to use a dedicated power to circulate the mixed gas in the mixed gas circulation path (51), and the apparatus can be simplified and power can be saved.
[0020]
The invention according to claim 9 is characterized in that a catalyst reaction section (20) is formed in the heat exchange section (30).
[0021]
With such a configuration, even when the catalytic reaction rapidly progresses during warm-up and the heat of the catalytic reaction rises excessively, the thermal medium in the heat exchange section (30) prevents the thermal runaway of the catalyst. It is possible to do. Further, by integrating the catalytic reaction section and the heat exchange section, the size of the entire apparatus can be reduced.
[0022]
Further, the invention according to claim 10 is characterized in that the fuel is hydrogen. Since hydrogen has high reactivity, warming-up by a self-sustaining reaction can be performed at a lower temperature. Further, the catalytic reaction type heating device can be suitably used as a heat source for warming up a fuel cell system using hydrogen as a fuel, for example.
[0023]
In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means described in embodiment mentioned later.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The catalytic reaction heating device according to the first embodiment heats a heat medium by using heat obtained by a catalytic reaction, and heats an object to be heated via the heat medium.
[0025]
FIG. 1 is a conceptual diagram showing the overall configuration of the catalytic reaction heating device of the first embodiment. As shown in FIG. 1, in the catalytic reaction heating device, a heating gas path 2 through which a heating gas passes is formed by a casing 1. A mixed gas supply unit 10 that supplies a mixed gas of fuel and air is provided at the most upstream side of the heating gas path 2. The mixed gas supply section 10 has a fuel supply section 11 for supplying fuel, an air supply section 12 for supplying air, and a mixing section 13 for mixing fuel and air. In the first embodiment, hydrogen having excellent reactivity is used as the fuel.
[0026]
A catalytic reaction section 20 is provided downstream of the mixed gas supply section 10 in the heating gas path 2. In the catalytic reaction section 20, the mixed gas supplied from the mixed gas supply section 10 is subjected to a catalytic reaction to generate high-temperature combustion gas.
[0027]
FIG. 2 is a perspective view of the catalytic reaction section 20. For the catalyst reaction section 20, for example, a monolith catalyst shown in FIG. The monolith catalyst uses a ceramic monolith as a carrier and supports noble metals and metal oxides typified by platinum (Pt) and palladium (Pd) having excellent reaction activity even at low temperatures as an oxidation catalyst. As the catalyst reaction section 20, a pellet catalyst shown in FIG. 2B can be used instead of the monolith catalyst shown in FIG.
[0028]
A heat exchange unit 30 is provided downstream of the catalytic reaction unit 20 in the heating gas path 2. The heat exchange section 30 transfers the heat of the high-temperature gas generated in the catalytic reaction section 20 to the heat medium. In the first embodiment, cooling water is used as a heat medium.
[0029]
FIG. 3 is a perspective view of the heat exchange unit 30. An arbitrary heat exchanger can be used for the heat exchange unit 30, and for example, a fin tube type heat exchanger including a fin 31 and a flat tube 32 shown in FIG. 3A can be used. The heat conducting members such as the fins 31 and the tubes 32 use aluminum. The fin 31 constitutes a heating gas passage 2 through which a high-temperature gas passes, and the tube 32 constitutes a heating medium passage 3 through which cooling water passes. The hot gas passes through the gap between the adjacent fins 31, and the cooling water passes through the inside of the tube 32.
[0030]
Instead of the heat exchanger shown in FIG. 3A, a heat exchanger composed of a plate-like fin 31 and a circular tube 32 shown in FIG.
[0031]
The cooling water (heat medium) heated in the heat medium path 3 of the heat exchange unit 30 circulates through the heat medium circulation path (heat medium path) 40 to the body 41 to be heated, and heats the body 41 to be heated. . The heat medium circulation path 40 is provided with a circulation pump (heat medium supply means) 42 for circulating the cooling water. When hydrogen is used as the fuel for the catalytic reaction as in the first embodiment, a fuel cell using hydrogen as the fuel can be suitably used as the heated body 41.
[0032]
On the downstream side of the heat exchange section 30 in the heating gas path 2, a shut valve (retaining means) 50 capable of opening and closing the heating gas path 2 is provided. The shut valve 50 does not necessarily need to be able to shut off the heating gas path 2. When the shut valve 50 is closed, it becomes a resistance of the mixed gas, and the mixed gas can be sealed in the heating gas path 2. Anything should do.
[0033]
Further, the catalytic reaction heating device is provided with a control unit 60 for performing various controls. The control unit 60 is configured to output control signals to the fuel supply device 11, the air supply device 12, the heat medium circulation pump 42, and the shut valve 50.
[0034]
Next, the operation of the catalytic reaction type heating device having the above-described configuration will be described with reference to the flowchart of FIG. FIG. 4 shows the operation in the warm-up mode when the catalytic reaction heating device is started at a low temperature.
[0035]
First, a predetermined amount of fuel is supplied from the fuel supply device 11, and a predetermined amount of air is supplied from the air supply device 12 (S10). At this time, the shut valve 50 is opened, and the heat medium circulation pump 42 is stopped. The fuel and air are mixed in the mixing section 13 to generate a mixed gas, and the mixed gas is supplied to the catalytic reaction section 20. In the low temperature state, since the catalyst in the catalyst reaction section 20 has not reached the activation temperature, most of the mixed gas flows toward the heat exchange section 30 without reacting in the catalyst reaction section 20.
[0036]
Next, the shut valve 50 is closed (S11). Thereby, the mixed gas is sealed in the heating gas path 2. As a result, the mixed gas can be retained in the catalyst reaction section 20, and the catalytic reaction of the mixed gas proceeds in the catalyst reaction section 20. The gas oxidized in the catalytic reaction unit 20 is diffused by the concentration gradient in the heating gas path 2. On the other hand, since the mixed gas concentration is low in the catalytic reaction section 20, unreacted mixed gas existing in other parts is newly introduced to the catalytic reaction section 20 by diffusion. In the catalyst reaction section 20, the temperature of the catalyst rises due to heat generation due to oxidation of the mixed gas. As a result, the activity of the catalyst increases, and the oxidation of the unreacted mixed gas in a chain is promoted.
[0037]
At this time, since the heat medium circulation pump 42 is stopped, the cooling water does not circulate, so that the heat generated by the catalytic reaction can be prevented from being carried out of the apparatus by the cooling water.
[0038]
The sealing of the mixed gas by closing the shut valve 50 is performed until a predetermined time elapses (S12). The predetermined time is determined in advance based on the amount of the supplied mixed gas, the amount of the catalyst, and the reaction speed. That is, the larger the amount of the mixed gas, the longer the reaction time, and the longer the amount of the catalyst, the shorter the reaction time. The reaction rate changes depending on the catalyst temperature, and the higher the temperature, the faster the reaction rate.
[0039]
After the elapse of the predetermined time, the shut valve 50 is opened (S13). Thereby, the gas sufficiently oxidized in the heating gas path 2 is discharged out of the apparatus. Then, supply of fuel and air is started (S14), and circulation of cooling water is started (S15). As a result, the normal operation mode is entered from the warm-up mode. At this time, the catalyst in the catalyst reaction unit 20 is considered to have risen to the activation temperature or higher due to the reaction heat. Therefore, even if the fuel and air are continuously supplied in the normal operation mode, the catalyst reaction unit 20 does not Catalytic reaction can be performed, and emission of unreacted gas can be suppressed.
[0040]
As described above, the space velocity in the heating gas path 2 can be made apparently zero by causing the mixed gas to stay in the catalyst reaction section 20 by the shut valve 50 at the time of startup when the catalyst temperature is low, and The catalyst temperature can be raised by causing the mixed gas to undergo a catalytic reaction while suppressing the emission of gas. Thereby, the catalyst can be heated and heated quickly without providing a heat source for heating the catalyst, and the emission of unreacted gas can be suppressed.
[0041]
In addition, by stopping the circulation of the cooling water while the mixed gas is retained in the catalyst reaction section 20, the reaction heat of the mixed gas can be prevented from being released to the outside of the apparatus, and the catalyst temperature can be quickly increased. Can be done.
[0042]
(2nd Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment in that a fuel concentration detecting means for detecting the fuel concentration is provided. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described.
[0043]
FIG. 5 is a conceptual diagram showing the overall configuration of the catalytic reaction heating device of the second embodiment. As shown in FIG. 5, the heating gas path 2 is provided with a hydrogen sensor 61 (fuel concentration detecting means) for detecting the concentration of fuel (hydrogen). In the second embodiment, the hydrogen sensor 61 is provided downstream of the heat exchange unit 30 in the heating gas path 2. The sensor signal of the hydrogen sensor 61 is input to the control unit 60.
[0044]
In the second embodiment, in steps S11 to S13 in the flowchart of FIG. 4, the shut valve 50 is closed until the hydrogen concentration detected by the hydrogen sensor 61 becomes equal to or lower than a predetermined concentration. When the concentration falls below a predetermined concentration, the shut valve 50 is opened.
[0045]
As described above, by performing the opening / closing control of the shut valve 50 based on the hydrogen concentration which is the unreacted gas concentration, the process from the warm-up mode to the normal operation mode can be accurately and promptly controlled.
[0046]
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is different from the first embodiment in that a catalyst temperature detecting means for detecting a catalyst temperature is provided. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.
[0047]
FIG. 6 is a conceptual diagram showing the overall configuration of the catalytic reaction heating device of the third embodiment. As shown in FIG. 6, the catalyst reaction section 20 is provided with a temperature sensor (catalyst temperature detecting means) 62 for detecting the temperature of the catalyst. The sensor signal of the temperature sensor 62 is input to the control unit 60.
[0048]
In the third embodiment, in steps S11 to S13 of the flowchart of FIG. 4 described above, the shut valve 50 is closed until the catalyst temperature detected by the temperature sensor 62 becomes equal to or higher than a predetermined temperature. When the temperature becomes equal to or higher than the predetermined temperature, the shut valve 50 is opened.
[0049]
With the above configuration, the same effect as in the second embodiment can be obtained.
[0050]
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is different from the first embodiment in that a mixed gas circulation path for circulating an unreacted mixed gas is provided. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.
[0051]
FIG. 7 is a conceptual diagram showing the overall configuration of the catalytic reaction heating device according to the fourth embodiment. As shown in FIG. 7, a mixed gas circulation path 51 that connects the upstream side and the downstream side of the catalytic reaction section 20 in the heating gas path 2 is provided. The mixed gas circulation path 51 is provided with a mixed gas circulation pump (mixed gas circulation means) 52 for circulating the mixed gas. In the fourth embodiment, the mixed gas is circulated from the downstream side to the upstream side of the catalytic reaction section 20 in the heating gas path 2.
[0052]
With such a configuration, by circulating the mixed gas to the catalytic combustion unit 20 in the warm-up mode in which the shut valve 50 is closed, the diffusibility of the mixed gas can be improved, and the frequency of contact of the mixed gas with the catalyst increases. can do. In addition, the heat energy given to the mixed gas can be recovered by the catalyst and the heat exchange unit 30, and can be linked to early activation of the catalyst.
[0053]
(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment differs from the fourth embodiment in the configuration of the mixed gas circulation means. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.
[0054]
FIG. 8 is a conceptual diagram showing the entire configuration of the catalytic reaction heating device of the fifth embodiment. As shown in FIG. 8, the mixed gas circulation path 51 joins the downstream side of the mixed gas supply unit 10. An ejector section (mixed gas circulation means) 53 for circulating the mixed gas in the mixed gas circulation path 51 by an ejector effect is provided at the junction. The ejector unit 53 uses the fluid energy of the mixed gas supplied from the mixed gas supply unit 10 to suck and circulate the mixed gas in the mixed gas circulation path 51. In the fifth embodiment, a plurality of nozzles from which the mixed gas is jetted are provided.
[0055]
With such a configuration, it is not necessary to use a dedicated power to circulate the mixed gas in the mixed gas circulation path 51, and the apparatus can be simplified and power can be saved.
[0056]
(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIGS. The sixth embodiment is different from the second embodiment in that the catalytic reaction section and the heat exchange section are integrated. The same parts as those in the above embodiments are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.
[0057]
FIG. 9 is a conceptual diagram showing the overall configuration of the catalytic reaction heating device of the sixth embodiment, and FIG. 10 is a perspective view of the catalytic reaction section 20 and the heat exchange section 30 of the sixth embodiment. As shown in FIG. 9, the catalytic reaction section 20 and the heat exchange section 30 are integrated. As shown in FIG. 10, an oxidation catalyst is carried on the surface of the fin 31 in the heat exchange unit 30. Further, an oxidation catalyst may be supported on the surface of the tube 32. By supporting the oxidation catalyst at the portion of the heat exchange unit 30 through which the mixed gas passes, the catalyst reaction unit 20 can be formed, and the catalyst reaction unit 20 and the heat exchange unit 30 can be integrated. .
[0058]
Such a configuration facilitates control of reaction heat during the warm-up mode. That is, even when the catalytic reaction rapidly progresses during warm-up and the heat of the catalytic reaction rises excessively, the thermal runaway of the catalyst is avoided by the presence of the cooling water (heat medium) in the heat exchange unit 30. Becomes possible. Further, by integrating the catalytic reaction section and the heat exchange section, the size of the entire apparatus can be reduced.
[0059]
(Other embodiments)
Note that the configurations of the above embodiments can be implemented in appropriate combinations.
[0060]
Further, in the configuration of each of the above embodiments, the shut valve 50 is not provided, and a predetermined amount of fuel is supplied from the fuel supply device 11 and the predetermined amount of air is supplied from the air supply device 12 as the stagnation means. Alternatively, the mixed gas may be retained in the catalyst reaction section 20. As a result, the fuel and air that are newly supplied are not pumped, so that a certain amount of mixed gas can be retained in the catalyst reaction unit 20 only by stopping the supply of fuel and air.
[0061]
In the second embodiment, the hydrogen sensor 61 is used as the fuel concentration detecting means for detecting the fuel concentration. However, the present invention is not limited to this. For example, an oxygen sensor (O2 sensor) for detecting the oxygen concentration can be used. Since oxygen is consumed simultaneously with the catalytic combustion of the fuel, the fuel concentration can be indirectly detected by detecting the oxygen concentration with the oxygen sensor.
[0062]
Further, the ejector unit 53 of the fifth embodiment circulates the mixed gas in the heating gas path 2 using the fluid energy of the mixed gas, but is not limited thereto, and is supplied from the fuel supply device 11. What is necessary is just to use at least one fluid energy of fuel, air supplied from the air supply device 12, or a mixed gas thereof.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing the overall configuration of a catalytic reaction heating device according to a first embodiment.
FIG. 2 is a perspective view of a catalytic reaction unit according to the first embodiment.
FIG. 3 is a perspective view of a heat exchange unit according to the first embodiment.
FIG. 4 is a flowchart showing the operation of the catalytic reaction heating device of the first embodiment.
FIG. 5 is a conceptual diagram showing an overall configuration of a catalytic reaction heating device according to a second embodiment.
FIG. 6 is a conceptual diagram showing the overall configuration of a catalytic reaction heating device according to a third embodiment.
FIG. 7 is a conceptual diagram showing an overall configuration of a catalytic reaction heating device according to a fourth embodiment.
FIG. 8 is a conceptual diagram showing the overall configuration of a catalytic reaction heating device according to a fifth embodiment.
FIG. 9 is a conceptual diagram showing an overall configuration of a catalytic reaction heating device according to a sixth embodiment.
FIG. 10 is a perspective view of a catalyst reaction unit and a heat exchange unit according to a sixth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Mixed gas supply part, 11 ... Fuel supply part, 12 ... Air supply part, 20 ... Catalytic reaction part, 30 ... Heat exchange part, 40 ... Heat medium circulation path, 41 ... Heated body, 42 ... Heat medium circulation pump , 50 ... shut valve, 60 ... control unit.

Claims (10)

A catalytic reaction heating device that heats a heating medium using a catalytic reaction,
A heating gas path (2) through which the hot gas passes;
A catalyst is provided in the heating gas path (2) and has a catalyst. The mixed gas of the fuel supplied from the fuel supply unit (11) and the air supplied from the air supply unit (12) undergoes a catalytic reaction. A catalytic reaction section (20) for generating the high-temperature gas;
A heating medium path (40) through which the heating medium passes;
A heat exchange unit (30) disposed downstream of the catalytic reaction unit (20) in the heating gas path (2) and transmitting heat of the high-temperature gas to the heat medium;
A catalytic reaction type heating device comprising: a retaining means (50) for retaining the mixed gas in the catalytic reaction section (20). The retention means is an on-off valve (50) provided on the downstream side of the heat exchange section (30) in the heating gas path (2) and capable of opening and closing the heating gas path (2);
The catalytic reaction heating device according to claim 1, wherein the mixed gas is retained in the catalytic reaction section by closing the heating gas path (2) by the on-off valve (50). The stagnation unit supplies a predetermined amount of fuel from the fuel supply unit (11) to the catalyst reaction unit (20), and supplies air from the air supply unit (12) to the catalyst reaction unit (20) with a predetermined amount of air. The catalytic reaction heating device according to claim 1 or 2, wherein the mixed gas is retained in the catalytic reaction section (20) until a predetermined time has elapsed after the supply. A heat medium supply means (42) provided in the heat medium path (40) for supplying the heat medium to the heat exchange section (30);
The heat medium supply means (42) does not supply the heat medium to the heat exchange section (30) while the mixed gas is retained in the catalyst reaction section (20) by the retention means. The catalytic reaction heating device according to any one of claims 1 to 3. A fuel concentration detector (61) disposed downstream of the catalytic reaction section (20) in the heating gas path (2), for detecting a fuel concentration in the heating gas path (2);
Control means (60) for controlling said staying means (50) such that said mixed gas stays in said catalytic reaction section (20) until the fuel concentration detected by said fuel concentration detecting means (61) becomes equal to or lower than a predetermined concentration; The catalytic reaction heating device according to any one of claims 1 to 4, further comprising: Catalyst temperature detecting means (62) for detecting a catalyst temperature of the catalyst reaction section (20);
A control unit (60) that controls the staying unit (50) so that the mixed gas stays in the catalyst reaction unit (20) until the catalyst temperature detected by the catalyst temperature detecting unit (62) falls below a predetermined temperature. The catalytic reaction heating device according to any one of claims 1 to 4, further comprising: A mixed gas circulation path (51) communicating the upstream side and the downstream side of the catalytic reaction section (20) in the heating gas path (2);
A mixed gas provided in the mixed gas path (51) and circulating the mixed gas present in the heating gas path (2) to the catalytic reaction section (20) via the mixed gas circulation path (51). The catalytic reaction heating device according to any one of claims 1 to 6, further comprising a circulation means (52, 53). The mixed gas circulating means uses the fuel supplied from the fuel supply means (11), the air supplied from the air supply means (12), or the mixed gas using at least one fluid energy of the mixed gas. The catalytic reaction heating device according to claim 7, characterized by an ejector section (53) for circulating the mixed gas through a gas path (51). The catalytic reaction heating device according to any one of claims 1 to 8, wherein the catalyst reaction unit (20) is formed in the heat exchange unit (30). The catalytic reaction heating device according to any one of claims 1 to 9, wherein the fuel is hydrogen.

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