JP2006286249A - Gas purge mechanism of fuel reformer in fuel cell power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a cylinder smaller than that for nitrogen by using carbon dioxide as an inert gas, and to reduce the size and the cost of a fuel cell power generation system. <P>SOLUTION: The fuel reformer is composed by connecting, by arranging pipes between them, a desulfurizer 1, the reformer 2, a CO converter 3 and a CO remover 4, in this order, and is formed to be closed, by mounting a first closing valve 6 and a second closing valve 7 on the introduction side of a hydrocarbon-based material fuel and on the extraction side of a reformed gas, respectively. A cylinder 8 for storing carbon dioxide stored is connected, by arranging a pipe, to an intermediated part of the connection piping between the desulfurizer 1 and the reformer 2; a third closing valve 9 and a fourth closing valve 10 are mounted on the upstream side of the connection part of the cylinder 8 and on the downstream side thereof, respectively; a regulator 12 is mounted to the connection pipe of the cylinder 8; and a fifth closing valve 11 is mounted on the downstream side of the regulator 12. Carbon dioxide is supplied from the cylinder 8 in emergency stop of the fuel reformer or in leak detection thereof and purges it. When the internal pressure of the reformer 2 is set at a negative value due to leakage, carbon dioxide is supplied from the cylinder 8, to prevent performance degradation of a catalyst by suppressing inflow of air. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel reformer that reforms a hydrocarbon-based raw fuel into a hydrogen-based reformed gas and supplies the reformed gas to a fuel cell. The present invention relates to a gas purge mechanism of a fuel reforming apparatus in a fuel cell power generation system that ensures the safety of the apparatus and prevents catalyst deterioration.

  As is well known, a fuel cell is a power generation device that generates direct-current power by electrochemically reacting hydrogen and oxygen (or air). In order to supply hydrogen to the fuel cell, a fuel reformer is incorporated in the fuel cell power generation system, and the fuel reformer reforms hydrocarbon-based raw fuel into a reformed gas mainly composed of hydrogen. Is generally supplied to the fuel electrode of the fuel cell. The fuel reformer usually includes a desulfurizer that removes sulfur contained in the raw fuel, a reformer that steam-reforms the desulfurized raw fuel into a hydrogen-based reformed gas, and a reformer. A CO converter that converts carbon monoxide contained in the gas into carbon dioxide, and a CO remover that selectively oxidizes the carbon monoxide remaining in the reformed gas into carbon dioxide.

  During normal operation of the fuel cell, the power generation reaction is continued by continuously supplying the reformed gas from the fuel reformer to the fuel cell. A situation occurs in which the reformed gas remains in the quality device. The reformer in the fuel reformer is installed during the operation of the fuel cell because steam reforming through the catalyst is performed at a high temperature of about 700 ° C. and the steam reforming is an endothermic reaction. The burner is continuously burned, and the reformer is heated by the combustion heat to maintain the appropriate high temperature. Although this reformer stops combustion of the burner as the operation of the fuel cell is stopped, the internal temperature of the reformer does not drop rapidly in a short time. For this reason, trouble may occur if the reformed gas remains and accumulates in the reformer. Further, not only when the operation is stopped, but when air flows into the reformer due to troubles such as an on-off valve, the catalyst stored in the reformer is oxidized and deteriorated.

  In order to avoid such troubles due to residual reformed gas and catalyst deterioration due to inflowing air, an inert gas is supplied and residual reformed gas or For example, Patent Literature 1 and Patent Literature 2 disclose a technique for purging and purging inflowing air.

  The invention of Patent Document 1 includes a fuel cell, a fuel reformer, an air supply system, a fuel gas supply system, a pneumatic cylinder valve, an operation gas system having an electromagnetic cutoff valve, and a replacement gas system having an electromagnetic cutoff valve. Equipped with an inert gas source (nitrogen gas storage tank) that supplies inert gas to the operating gas system and the replacement gas system outside the device, and is connected to the operating gas system and the replacement gas system via a shut-off valve, respectively. The auxiliary inert gas cylinder (nitrogen cylinder) is provided in the apparatus, and the supply of the inert gas is switched from the external inert gas source to the auxiliary inert gas cylinder when the operation power of the electromagnetic shut-off valve is lost.

The invention of the above-mentioned Patent Document 2 is a fuel cell system that, when stopping the fuel cell system, replaces the hydrogen in the system with an inert gas and combusts the hydrogen exhausted by the replacement. The temperature sensor for detecting the temperature and a control means for controlling the supply and stop of the inert gas by the inert gas supply means based on the measured value from the temperature sensor. And when the temperature change of a combustor falls rapidly, it is set as the supply stop timing of an inert gas.
JP-A-6-290800 JP-A-11-111319

  In the above-described conventional inert gas replacement, nitrogen is used as an inert gas, so a nitrogen gas storage tank, a nitrogen cylinder, etc. are indispensable components, and these are considerably large-sized fuel cells. There has been a problem in that the power generation system becomes larger and costs increase.

  The present invention has been made to solve such problems in the prior art, and by using carbon dioxide instead of nitrogen as an inert gas, it is possible to use a small cylinder as compared with nitrogen. The purpose of the present invention is to reduce the size of the fuel cell power generation system and to reduce the cost.

  According to a first aspect of the present invention, there is provided a fuel reformer for reforming a hydrocarbon-based raw fuel into a hydrogen-based reformed gas and supplying the reformed fuel to a fuel cell. A cylinder containing an inert gas is connected to the introduction side or the reformed gas outlet side, and the inert gas is supplied from the cylinder to the fuel reformer when the fuel reformer is in an emergency stop or when a leak is detected. The gist of the present invention is a gas purge mechanism of a fuel reformer in a fuel cell power generation system.

  According to a second aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to the first aspect, the fuel reformer includes a material introduction side and a reformed gas outlet side that contribute to the reaction. It is characterized in that it can be cut off via an on-off valve.

  According to a third aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to the first aspect, an emergency stop under a specific condition is performed during start-up of the reformer included in the fuel reformer. When the inside of the reformer is detected to turn to a negative pressure, an inert gas is supplied from the cylinder to the reformer.

  According to a fourth aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of the first to third aspects, the internal pressure of the reformer may cause a malfunction of the on-off valve or a welding location. Inert gas is supplied from the cylinder to the fuel reformer when the main power supply has to be turned off due to a malfunction or failure, etc., when the pressure is lower than the specified temperature or higher than the specified pressure, or for some reason during operation. It is characterized by that.

  According to a fifth aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to the fourth aspect, when the internal pressure of the reformer is not more than a specified temperature and not less than a specified pressure, the reforming is performed. The container temperature is 300 ° C. or lower and minus 10 kPa or higher.

  According to a sixth aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of the first to fifth aspects, carbon dioxide is used as the inert gas.

  According to a seventh aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of the first to sixth aspects, an open / close valve is provided in a connecting pipe of the cylinder containing the inert gas. It is provided.

  According to an eighth aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of the first to seventh aspects, a desulfurizer and a reformer included in the fuel reformer, A cylinder containing an inert gas is connected to the connection pipe.

  According to a ninth aspect of the present invention, in the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of the first to eighth aspects, in the middle of the connecting pipe of the cylinder containing the inert gas, A regulator is provided that can reduce the pressure of the inert gas contained in the cylinder to 100 kPa or less.

  A tenth aspect of the present invention is the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of the first to ninth aspects, wherein the inertness in a connection pipe between the desulfurizer and the reformer is provided. An on-off valve is provided on the upstream side and / or the downstream side from the connection point of the cylinder containing the gas.

  Claim 11 of the present invention is the gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of claims 1 to 10, wherein the inert gas is compressed to a filling ratio of 1.2 or more. It is a small cylinder with a filling amount of 50 L or less and / or 80 g or less.

  According to the first aspect of the invention, at the time of an emergency stop of the fuel cell or an emergency stop due to a trouble, an inert gas is supplied to the fuel reformer from a cylinder connected to the fuel reformer, thereby the reformer It is possible to drive out and replace the reformed gas remaining in the gas. Thereby, troubles such as a reformer can be avoided.

  According to the second aspect of the invention, at the time of an emergency stop of the fuel cell or an emergency stop due to a trouble, the introduction of the substance contributing to the reaction is prevented by closing the on-off valves on the introduction side and the exit side of the fuel reformer. At the same time, it is possible to prevent the reformed gas from being led out to the fuel cell side.

  According to the third aspect of the invention, the internal pressure of the reformer is changed to a negative pressure due to an emergency stop under a specific condition of the reformer included in the fuel reformer at the start or during operation of the fuel cell. When this is detected, the reformer can be protected by purging the reformer with an inert gas.

  According to the fourth aspect of the invention, when the internal pressure of the reformer included in the fuel reformer is lower than the specified temperature and higher than the specified pressure due to a failure of the on-off valve or a failure of the welded part, or during operation. When the main power source has to be turned off due to an unexpected reason, the inflow of air can be suppressed by supplying an inert gas from the cylinder to the reformer. Thereby, oxidation of the catalyst accommodated in the reformer can be prevented as much as possible, and deterioration of the catalyst can be suppressed.

  According to the fifth aspect of the invention, when the internal pressure of the reformer is equal to or lower than minus 10 kPa at the reforming vessel temperature of 300 ° C. or lower, the purge with the inert gas is surely performed and the air flows into the reformer. Can be suppressed.

  According to the sixth aspect of the invention, by using carbon dioxide as the inert gas, it is possible to use a small cylinder as compared with the case of using conventional nitrogen. Thus, even if the cylinder is incorporated in the fuel reformer, the entire fuel cell power generation system is not enlarged.

  According to the seventh aspect of the present invention, if the on-off valve provided in the connecting pipe of the cylinder is opened at the time of the leak check of the reformer, if the negative pressure is generated in the reformer due to the gas leak, the inert gas from the cylinder Flows into the reformer. Thereby, the leak check of a reformer can be simply performed using the cylinder which accommodated the inert gas.

  According to the invention of claim 8 above, since the cylinder containing the inert gas is connected to the connecting pipe between the desulfurizer and the reformer included in the fuel reformer, at the time of emergency stop due to trouble, By closing the on-off valve on the raw fuel introduction side of the fuel reformer and supplying the inert gas from the cylinder to the reformer in the high temperature range, the reformed gas remaining in the reformer is expelled. Can be replaced. Thereby, it is possible to prevent troubles in the reformer and prevent troubles from spreading to the fuel cell side.

  According to the ninth aspect of the present invention, a regulator capable of reducing the pressure of the inert gas accommodated in the cylinder to 100 kPa or less is provided in the middle of the connecting pipe of the cylinder accommodating the inert gas. At the time of stoppage or the like, an inert gas whose pressure is appropriately adjusted can be introduced into the reformer. Thereby, the flow of gas is not hindered due to dew condensation due to adiabatic expansion of the compressed gas, and the cost can be reduced by increasing the degree of freedom of selection of on-off valves, pumps and the like. Furthermore, the reformer can be protected by suppressing the internal pressure of the reformer from increasing instantaneously.

  According to the tenth aspect of the present invention, the on / off valve is provided upstream and / or downstream from the connection point of the inert gas storage cylinder in the connection pipe between the desulfurizer and the reformer. When the on-off valve on the upstream side is closed, the inert gas can be reliably supplied to the reformer side without causing the inert gas to flow into the desulfurizer side. Further, if the downstream on-off valve is closed after supplying the inert gas to the reformer, the backflow of the inert gas can be prevented and the gas purge inside the reformer can be reliably maintained.

  According to the eleventh aspect of the present invention, the inert gas may be a small cylinder with a filling amount compressed to a filling ratio of 1.2 or more and 50 L or less and / or 80 g or less, and therefore, the inert gas may be smaller than a conventional nitrogen cylinder. . Thereby, even if it uses by incorporating in a fuel reformer, the whole fuel cell power generation system does not enlarge, and since it is possible to use a commercially available general-purpose product, it is possible to reduce the cost.

Hereinafter, embodiments of a gas purge mechanism of a fuel reformer in a fuel cell power generation system according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a block diagram showing a schematic configuration of a fuel cell power generation system including a gas purge mechanism of a fuel reformer according to the present invention. The fuel reformer includes a desulfurizer 1, a reformer 2, and a CO converter 3. And a CO remover 4 in this order.

  Briefly explaining the operation of this fuel reformer, hydrocarbon-based raw fuel (for example, city gas, LPG gas, etc.) is supplied to the desulfurizer 1, and the sulfur content contained in the raw fuel by this desulfurizer 1. Is desulfurized. If the raw fuel is supplied as it is to the reformer 2 without desulfurization, the catalyst contained in the reformer 2 is poisoned by the sulfur component and the catalytic performance is lowered. It is necessary to perform desulfurization treatment in the previous stage.

  Next, the desulfurized raw fuel is mixed with steam generated by a vaporizer (not shown), and then introduced into the reformer 2 for steam reforming. For example, a noble metal-based catalyst is accommodated in the reformer 2 and is steam reformed into a hydrogen-based gas at a high temperature range of about 700 ° C. For this reason, the reformer 2 is provided with a burner 2a. At the start of operation, the raw fuel is supplied to the burner 2a and burned, and the heat of the reformer 2 is heated by this combustion heat until the temperature reaches a predetermined temperature. To do. Even during operation, since steam reforming by the catalyst is an endothermic reaction, combustion of the burner 2a is continued to heat the reformer 2 and maintain the predetermined temperature. During operation, off-gas discharged from the fuel electrode of the fuel cell 5 can be introduced into the burner 2a and burned.

  The reformed gas generated by the reformer 2 is a gas mainly composed of hydrogen but contains carbon monoxide and the like, so that it is introduced into the CO converter 3 to convert the carbon monoxide into carbon dioxide, thereby converting the CO concentration. Reduce. Further, after the CO concentration is further reduced by selectively oxidizing carbon monoxide introduced from the CO converter 3 to the CO remover 4 and remaining in the reformed gas, the reformed gas is supplied to the fuel electrode of the fuel cell 5. Supply. Since carbon monoxide contained in the reformed gas poisons the electrode catalyst of the fuel cell 5 and lowers the power generation performance, it is necessary to reduce the CO concentration to about 10 ppm or less.

  In the fuel reformer configured as described above, the first on-off valve 6 is provided on the upstream side of the desulfurizer 1 on the raw fuel introduction side, and the second on-off valve 7 is provided for CO removal on the reformed gas outlet side. It is located downstream from the vessel 4. As a result, the fuel reformer is closed at both ends of the inlet of the substance contributing to reforming and the outlet of the reaction product via the first on-off valve 6 and the second on-off valve 7.

  In addition, a cylinder 8 is connected to an intermediate portion of the connection pipe between the desulfurizer 1 and the reformer 2, and a third on-off valve 9 is provided on the upstream side of the connection portion of the cylinder 8. A fourth on-off valve 10 is provided downstream from the location. Further, a regulator 12 is provided in the connecting pipe of the cylinder 8, and a fifth on-off valve 11 is provided downstream of the regulator 12. Accordingly, when the fifth on-off valve 11 is opened, the inert gas accommodated in the cylinder 8 is regulated by the regulator 12 and supplied to the reformer 2. The cylinder 8 can be connected not only to the raw fuel introduction side but also to the outlet side. Moreover, an electromagnetic valve can be employed as the first on-off valve 6 to the fifth on-off valve 11.

In the comparative example using a general-purpose regulator as the regulator 12, the primary pressure 6MPa of the inert gas could be reduced only to 1MPa, so that excessive pressure was applied to the fuel cell 5 when the inert gas was supplied, and the battery leaked. Because it triggered, regular power generation can no longer be performed. In this embodiment, by using the regulator 12 that can be depressurized to 100 kPa or less, preferably 70 kPa or less, more preferably 50 kPa or less, the inert gas is supplied to the fuel reformer without adversely affecting the fuel cell 5 due to excessive pressure. Could be supplied. If a regulator is not used or a general-purpose regulator is used, condensation will occur in the piping when carbon dioxide is released and gas will not be sent sufficiently, or the on-off valve or pump used may be damaged, or the on-off valve or pump may be selected. The width will be limited.

  In the present embodiment, the inert gas containing carbon dioxide in the cylinder 8 is used. However, since carbon dioxide has a lower vapor pressure than nitrogen (see FIG. 2), it is a container smaller than a conventionally used nitrogen cylinder. Even if it exists, it is possible to compress and accommodate a large capacity. For example, a small cylinder having a filling amount compressed to a carbon dioxide filling ratio (filling pressure MPa) of 1.2 or more and 50 L or less and / or 80 g or less can be used. This type of small cylinder is generally commercially available, and since it is a general-purpose product, it can be obtained at a low cost, and since a small container is sufficient compared to a nitrogen cylinder, it is not bulky even if incorporated in a fuel reformer. The power generation system will not be enlarged. Thereby, it can contribute to size reduction and cost reduction of a fuel cell system.

  At the time of an emergency stop or the like due to a trouble in the fuel cell 5, the first on-off valve 6 and the second on-off valve 7 are closed, and both ends of the fuel reformer are closed to be in a cold pressure holding state. During this cold holding pressure, the internal pressure of the reformer 2 is reduced to a negative pressure due to condensation of water or a decrease in temperature. In this state, if a leak occurs due to a failure of the on-off valve upstream of the reformer 2, air flows into the reformer 2. When air flowed in, the catalyst inside the reformer 2 was oxidized, and a temperature increase of the reformer 2 was observed. In this state as a comparative example, reforming was started in the reformer 2 at the start of operation. As a result, reforming of the gas at the outlet was incomplete, and mixing of raw fuel and intermediate products was observed.

  In the present embodiment, when the internal pressure of the reformer 2 becomes minus 10 kPa or more at the reforming vessel temperature of 300 ° C. or lower due to a malfunction of the on-off valve or a malfunction of the welded portion of the reformer 2, or during operation. When the main power source has to be turned off due to an unexpected reason, the fifth on-off valve 11 is opened to supply the inert gas from the cylinder 8 into the reformer 2. Thereby, since the inside of the reformer 2 was replaced with an inert gas to suppress the inflow of air, the oxidation of the catalyst was suppressed, and the temperature increase of the reformer 2 due to the oxidation was not recognized. When the reformer 2 started reforming at the start of operation after exchanging the on-off valve of the leak failure, the gas at the outlet was subjected to gas analysis, and as a result, the CO concentration was 10 ppm or less, and the reforming was almost complete. However, the composition was the same as normal, and almost no deterioration of the catalyst was observed. Although not shown, a pressure gauge for measuring the internal pressure of the reformer 2 is provided.

  FIG. 3 is a graph showing the detection of the reformer leak by the sensor, and the range of minus 10 kPa or higher at 300 ° C. or lower indicated by hatching in the cooling process is regarded as a region that is not regarded as a reformer leak. Even in such a cooling process, it is preferable to perform purging with carbon dioxide in an area where the reformer leak is not considered, and to perform error display / center notification.

  At the start of operation, raw fuel is supplied to the burner 2a and burned, and the reformer 2 is heated up to a predetermined temperature by the heat of combustion. When the weld crack occurred, the internal pressure of the reformer 2 became minus 10 kPa or more due to the leakage even though it was 300 ° C. or less. When reforming was started in the reformer 2 in this state, a hydrogen sensor (not shown) reacted to stop the operation. At this time, oxidation of the catalyst and carbon deposition were observed in the reformer 2.

  In this embodiment, since the leak is detected by the pressure gauge in the temperature raising process of the reformer 2 and the inert gas is supplied from the cylinder 8 for replacement, the operation is stopped before the reformer 2 starts reforming. We were able to. Further, after the operation is started, steam is introduced into the reformer 2 in the process of raising the temperature of the reformer 2, and then raw fuel is introduced. During this time, if an emergency stop occurs due to an unexpected situation, the reformer 2 exceeds the pressure resistance of the vessel or the pressure of the on-off valve due to condensation of water vapor. In such a case, carbon dioxide purge is performed. When carbon dioxide is used as the inert gas as described above, for example, the filling pressure is 6 MPa, the filling amount is 8 liters, and the cylinder 8 has a sufficient amount to replace the inside of the reformer 2 more than twice. Yes. Conventionally, when nitrogen is used as an inert gas, the ready-made product has a filling pressure of 18.6 MPa and a filling amount of 3 liters, which is only equivalent to the amount of replacement in the reformer 2 once.

  In the present embodiment, the cylinder 8 is connected to the intermediate portion of the connection pipe between the desulfurizer 1 and the reformer 2 as described above, and the third on-off valve 9 is provided upstream of this connection point. ing. Therefore, when supplying the inert gas from the cylinder 8 to the reformer 2, if the third on-off valve 9 is closed, the leak generated in the reformer 2 is not affected without affecting the desulfurizer 1 side. Active gas can be supplied to the reformer 2. As a comparative example, when the cylinder 8 is connected to the upstream position of the desulfurizer 1, the inert gas supplied to the reformer 2 passes through the desulfurizer 1. The adsorbed sulfur component is desorbed and flows into the reformer 2 side, thereby degrading the catalytic performance of the reforming catalyst.

  In the fuel cell power generation system, when the reformer 2 is installed or as a leak test after replacement of the CO remover 4 or the like, in the case of a comparative example that does not include a small inert gas cylinder, it is necessary to bring an inert gas cylinder separately. It was. For this reason, an inert gas cylinder has to be brought in separately at the time of installation or replacement, and piping work for this purpose has occurred, resulting in reduced workability. In the present embodiment, since the fuel cell power generation system incorporates a small inert gas cylinder, the leak test can be completed using the inert gas cylinder, and it is not necessary to bring an inert gas cylinder separately. It can be a system.

  After the operation of the fuel cell 5 is stopped, the internal pressure of the reformer 2 and the like becomes negative as described above in the both-end closed type fuel reformer, but the internal pressure of the reformer 2 and the like in the cooled state after the stop is reduced. It did not drop below 0 kPa. When this was left and restarted after cooling, it stopped due to a voltage drop of the fuel cell 5. This is considered to be caused by the inflow of air due to the leakage of the on-off valve and the inability to sufficiently remove carbon monoxide due to the deterioration of the CO shift catalyst, and the fuel reformer was forced to be replaced. In the present embodiment, the leak error is detected by supplying the inert gas using the cylinder 8 in the cooling process. As a result of the investigation, it was caused by the external leakage of the on-off valve installed in the previous stage of the reformer 2. When the engine was restarted after replacing the on-off valve, the fuel cell 5 could be operated without any problem.

  The gas purge mechanism of the fuel reformer according to the present invention can be effectively used by being applied to the fuel reformer in the fuel cell power generation system.

1 is a block diagram schematically showing the configuration of a fuel cell power generation system including a gas purge mechanism of a fuel reformer according to the present invention. It is a graph which shows roughly the vapor pressure curve of the nitrogen conventionally used as an inert gas, and the carbon dioxide used as an inert gas by this invention. It is a graph which shows the leak detection of the reformer by a sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Desulfurizer 2 Reformer 2a Burner 3 CO converter 4 CO remover 5 Fuel cell 6 1st on-off valve 7 2nd on-off valve 8 Cylinder 9 3rd on-off valve 10 4th on-off valve 11 5th On-off valve 12 Regulator

Claims (11)

  In a fuel reformer that reforms hydrocarbon-based raw fuel into hydrogen-based reformed gas and supplies it to the fuel cell, a cylinder containing an inert gas is connected to the raw fuel introduction side or reformed gas outlet side A gas purge mechanism for a fuel reformer in a fuel cell power generation system, wherein an inert gas is supplied from the cylinder to the fuel reformer when an emergency stop of the fuel reformer or a leak is detected.   2. The fuel in a fuel cell power generation system according to claim 1, wherein the fuel reformer is configured such that a substance introduction side and a reformed gas outlet side contributing to a reaction can be cut off via an on-off valve, respectively. Gas purge mechanism for reformer.   When the reformer included in the fuel reformer detects that the inside of the reformer has turned to a negative pressure due to an emergency stop under a specific condition during the start-up of the reformer, the reformer removes the inert gas from the cylinder. The gas purge mechanism of the fuel reformer in the fuel cell power generation system according to claim 1, wherein the gas purge mechanism is supplied to the fuel reformer.   When the internal pressure of the reformer is below the specified temperature and above the specified pressure due to failure of the on-off valve or failure of the welding location, or when the main power source has to be turned off due to an unexpected reason during operation, The gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of claims 1 to 3, wherein an inert gas is supplied from the cylinder to the fuel reformer.   5. The fuel cell power generation system according to claim 4, wherein when the internal pressure of the reformer is equal to or lower than a specified temperature and equal to or higher than a specified pressure, the temperature of the reformer is 300 ° C. or lower and minus 10 kPa or higher. Gas purge mechanism for fuel reformer.   6. The gas purge mechanism of the fuel reformer in the fuel cell power generation system according to claim 1, wherein carbon dioxide is used as the inert gas.   The gas purge mechanism of the fuel reformer in the fuel cell power generation system according to any one of claims 1 to 6, wherein an opening / closing valve is provided in a connecting pipe of a cylinder containing the inert gas.   8. The fuel cell according to claim 1, wherein a cylinder containing an inert gas is connected to a connecting pipe between the desulfurizer and the reformer included in the fuel reformer. A gas purge mechanism of a fuel reformer in a power generation system.   9. The regulator according to claim 1, wherein a regulator capable of reducing the pressure of the inert gas accommodated in the cylinder to 100 kPa or less is provided in the middle of a connecting pipe of the cylinder accommodating the inert gas. A gas purge mechanism of a fuel reformer in any one of the fuel cell power generation systems.   10. The on-off valve is provided upstream and / or downstream from a connecting portion of the cylinder containing the inert gas in the connecting pipe between the desulfurizer and the reformer. A gas purge mechanism of a fuel reformer in any one of the fuel cell power generation systems.   The fuel cell according to any one of claims 1 to 10, wherein the inert gas is a small cylinder having a filling amount compressed to a filling ratio of 1.2 or more and having a filling amount of 50 L or less and / or 80 g or less. A gas purge mechanism of a fuel reformer in a power generation system.

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