JP2006278120A - Fuel cell power generating system, method for preparing its starting, and method for maintaining system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell power generating system determining the time for replacement of a desulfurizer from displayed information, by obtaining the information about the time of replacement and making it displayed on the display of an administration device to administer a plurality of fuel cell power generating systems through a network for example, and also to provide a method for preparing its starting, and a method for maintaining the desulfurizer surely, easily, and economically. <P>SOLUTION: This fuel cell power generating system 31 equipped with the desulfurizer replaced for every fixed period has a means to obtain information about the operating situation of the system, and is structured so that the time for replacement of the normal temperature desulfurizer is determined by the information obtained by the means, which is displayed on the display 33 of the administration device 32 to administer the system through the network 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel cell power generation system suitable as a small power source for home use, for example, and a maintenance method using the same.

  In recent years, a desulfurizer that removes sulfur contained in hydrocarbon fuel gases such as natural gas, city gas, methanol, LPG, and butane, and a reformer (RF that reacts the fuel gas with water vapor to reform hydrogen) ), A CO converter (SH) that converts carbon monoxide, a CO remover (PROX) that removes carbon monoxide, hydrogen (reformed gas) thus obtained, oxygen in the air, etc. There has been proposed a fuel cell power generation system as a small power source provided with a fuel cell that generates electricity by chemically reacting with an oxidant (see, for example, Patent Documents 1, 2, and 3).

  When a fuel gas containing hydrogen is supplied to the fuel electrode (AN) and air is supplied to the air electrode (CA), a fuel electrode reaction that decomposes hydrogen molecules into hydrogen ions and electrons at the fuel electrode, and oxygen and hydrogen ions at the air electrode Electrochemical reactions that generate water from the electrons are performed, and electric power is supplied to the load by electrons moving in the external circuit from the fuel electrode toward the air electrode, and water is generated on the air electrode side.

FIG. 13 shows a conventional fuel cell power generation system.
As shown in FIG. 13, the fuel cell power generation system 1 </ b> A includes a hydrocarbon fuel gas such as natural gas, city gas, methanol, LPG, butane, and a raw fuel gas supply line 3 having a raw fuel gas on-off valve 2. A desulfurizer 4 for supplying and desulfurizing is supplied, and desulfurized fuel gas desulfurized by the desulfurizer 4 is supplied via a desulfurized gas supply line 6 having a desulfurized fuel gas on-off valve 5, while water is supplied to a shut-off valve 7. The fuel reformer 10 [reformer (RF) is supplied to the vaporizer 8 to vaporize and supply steam through the check valve 9 to reform the fuel gas into hydrogen-rich reformed gas with reduced CO concentration. ) / CO converter (SH) / CO remover (PROX)], and a reformed gas supply line 12 having a reformed gas on-off valve 11 is provided for the reformed gas obtained by the fuel reformer 10. This reformed gas is then supplied to the anode (AN) And a fuel cell 13 which generates electricity by electrochemically reacting the oxygen in the air supplied to the air electrode (CA).

  Further, as shown in FIG. 13, the fuel cell power generation system 1A branches from the branch portion 14 of the raw fuel gas supply line 3 downstream of the raw fuel gas on-off valve 2, and the reaction by steam reforming is an endothermic reaction. A combustion raw fuel gas supply line 16 is provided for supplying a part of the raw fuel gas to the combustion section (burner) 15 of the fuel reformer 10 in order to supply a necessary amount of heat for maintaining the reforming reaction. . Further, hydrogen gas (off gas) discharged from the fuel cell 13 is supplied to the combustion section (burner) 15 via an off gas line 18 provided with a closing valve 17.

  19 and 21 are pressure gauges, 20 and 23 are on-off valves, 22 and 25 are pumps, and 24 is a check valve.

  In the fuel cell power generation system 1A having the above-described configuration, a hydrocarbon-based fuel gas such as natural gas, city gas, methanol, LPG, or butane is supplied to the desulfurizer 4 via the raw fuel gas supply line 3 for desulfurization, and desulfurization. The desulfurized fuel gas desulfurized in the vessel 4 is supplied to the fuel reformer 10 [reformer (RF) / CO converter (SH) / CO remover (PROX)] through the desulfurized gas supply line 6 and water is supplied. The vapor generated by being sent to the vaporizer 8 and vaporized is supplied to the fuel reformer 10, and the fuel gas is reformed into a hydrogen-rich reformed gas with a reduced CO concentration. The reformed gas is supplied to the fuel electrode (AN) of the fuel cell 13 through the reformed gas supply line 12, and the reformed gas and oxygen in the air supplied to the air electrode (CA) of the fuel cell 13 are electrically connected. Power is generated by chemical reaction.

When starting the fuel reformer 10, a part of the raw fuel gas is supplied to the combustion section (burner) 15 of the fuel reformer 10 via the raw fuel gas supply line 16 for combustion to maintain the reforming reaction. Heat so that the required amount of heat is supplied. After the start of the fuel cell power generation system 1A, hydrogen gas (off gas) discharged from the fuel cell 13 is supplied to the combustion unit (burner) 15 via the off gas line 18 and burned to be reformed in the fuel reformer 10. The amount of heat for maintaining the temperature can be obtained.
The hydrocarbon fuel gas supplied to the combustion section (burner) 15 of the fuel reformer 10 may be used after desulfurization by the desulfurizer 4.

Since an odorant containing sulfur is usually added to the hydrocarbon fuel gas (for example, LPG), it is necessary to remove sulfur in the desulfurizer 4. A high-temperature catalyst that uses residual heat and a zeolite-based desulfurization agent that can be desulfurized at room temperature are used (see, for example, Patent Document 4).
This desulfurizer that can be desulfurized at room temperature does not have a heating means that actively heats, and its operating temperature is the lower limit of the system operating temperature before each heating part of the system is heated at system startup. The temperature when the temperature of the desulfurizer rises due to the temperature rise of the equipment around the desulfurizer that does not take active heating means after starting the system becomes the upper limit, for example, when using the present invention for a household fuel cell, The temperature of the desulfurizer is -20 to 70 ° C, preferably -10 to 60 ° C, more preferably 0 to 50 ° C.
JP 2003-217620 A JP 2003-217623 A JP 2000-277137 A Japanese Patent Laid-Open No. 10-237473

The zeolitic desulfurizing agent is often used from the viewpoints that it can be desulfurized at room temperature, is easy to handle, and is easy to replace. However, this zeolitic desulfurizing agent removes sulfur components by adsorption, but also adsorbs hydrocarbon fuel gas at the same time, and desorbs the adsorbed hydrocarbon fuel gas when the temperature rises.
The desulfurizer 4 is replaced before the desulfurization performance deteriorates. After the replacement, when the temperature of the desulfurizer 4 rises during transportation, the hydrocarbon fuel gas adsorbed on the zeolitic desulfurizing agent is desorbed and desulfurized. When the internal pressure of the vessel 4 rises and the valve is opened, there is a problem that oversupply of the raw fuel gas to the subsequent fuel reformer occurs, the S / C is reduced from the set value, and coking is caused.
In addition, since air is adsorbed in the zeolitic desulfurization agent provided in the new desulfurizer, when installing a new desulfurizer in the fuel cell power generation system, use hydrocarbon fuel gas in the new desulfurizer. Although it is supplied and adsorbed, and desirably air is desorbed, there is a problem that it takes a long time and a large loss occurs.

The first object of the present invention is to acquire information on the operating status of the system provided in the fuel cell power generation system, detect the replacement time of the desulfurizer, and manage, for example, a plurality of fuel cell power generation systems via a network A fuel cell power generation system that displays on a display device of a management device or displays on a display device connected to the fuel cell power generation system itself without going through a network, and determines the replacement time based on the displayed information Is to provide
A second object of the present invention is to provide a start-up preparation method for a fuel cell power generation system,
The third object of the present invention is to provide a maintenance method capable of reliably, easily and economically maintaining a desulfurizer of a fuel cell power generation system.

  The fuel cell power generation system according to claim 1 of the present invention for solving the above-mentioned problem is a fuel cell power generation system including a desulfurizer that is replaced at regular intervals, and acquires information on the operating status of the system. The desulfurizer by means of information acquired by the means displayed on the display device of the management device and / or information acquired by the means displayed on the display device connected to the fuel cell power generation system. It is characterized in that it is configured to determine the replacement time.

  A fuel cell power generation system according to a second aspect of the present invention is the fuel cell power generation system according to the first aspect, wherein the management device is a management device via a network.

  The fuel cell power generation system according to claim 3 of the present invention is the fuel cell power generation system according to claim 1, wherein the information acquired by the means displayed on the display device connected to the fuel cell power generation system is The present invention is characterized in that the replacement timing of the desulfurizer is determined.

The fuel cell power generation system according to claim 4 of the present invention is the fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is attached to the desulfurizer last. It is an elapsed time since then.

  A fuel cell power generation system according to a fifth aspect of the present invention is the fuel cell power generation system according to any one of the first to third aspects, wherein the information acquired by the means is from the start of the fuel cell power generation system. It is the operation time to stop.

  The fuel cell power generation system according to claim 6 of the present invention is the fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is the raw fuel gas to the desulfurizer. It is characterized by the supply time of

  The fuel cell power generation system according to claim 7 of the present invention is the fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is a raw fuel gas to the desulfurizer. It is the supply integrated flow rate of

  The fuel cell power generation system according to claim 8 of the present invention is the fuel cell power generation system according to any one of claims 1 to 7, wherein the information obtained by the means is notified to the user's remote control. , Or displayed on a microcomputer meter via a dedicated line, or displayed on a display device of a management device via a network.

  A fuel cell power generation system according to a ninth aspect of the present invention is the fuel cell power generation system according to any one of the first to eighth aspects, wherein the information acquired by the means can be sorted by operating time and by area. It is characterized by having.

  The fuel cell power generation system according to claim 10 of the present invention is the fuel cell power generation system according to any one of claims 1 to 9, wherein the desulfurizer is selected from zeolite or metal-supported zeolite. The desulfurizer includes at least a desulfurizing agent.

  A start-up preparation method for a fuel cell power generation system according to an eleventh aspect of the present invention is a start-up preparation method for a fuel cell power generation system including a desulfurizer that is replaced at regular intervals. A new treated desulfurizer is installed.

  The start-up preparation method for the fuel cell power generation system according to claim 12 of the present invention is the start preparation method for the fuel cell power generation system according to claim 11, in which a new desulfurizer is attached before or after the new desulfurizer is attached. Before introducing the raw fuel gas into the desulfurizer, the inside of the new desulfurizer is once depressurized, and then the raw fuel gas is introduced and subjected to an adsorption treatment.

  The start preparation method for the fuel cell power generation system according to claim 13 of the present invention is the start preparation method for the fuel cell power generation system according to claim 11, wherein the inside of the new desulfurizer is put in a depressurized state before the new desulfurizer is attached. First, the raw fuel gas is introduced and subjected to adsorption treatment, and a new desulfurizer subjected to adsorption treatment is mounted.

  The fuel cell power generation system start-up preparation method according to claim 14 of the present invention is the fuel cell power generation system start-up preparation method according to claim 11, wherein the total amount of the introduced raw fuel gas is a container of a new desulfurizer desulfurization agent. The introduction of the raw fuel gas is stopped at 70 to 95% of the saturated adsorption amount at a temperature of 30 ° C.

  The fuel cell power generation system start-up preparation method according to claim 15 of the present invention is the fuel cell power generation system start-up preparation method according to any one of claims 12 to 14, wherein the new desulfurizer internal pressure is -10 kPa. It is characterized by being (gauge pressure at 25 ° C.) or less and −150 kPa (gauge pressure at 25 ° C.) or more.

  The fuel cell power generation system start-up preparation method according to claim 16 of the present invention is the fuel cell power generation system start-up preparation method according to claim 11 or 12, wherein the new desulfurizer internal pressure into which the raw fuel gas is introduced is The introduction of the raw fuel gas is stopped when the pressure reaches 0 kPa (gauge pressure).

  A maintenance method for a fuel cell power generation system according to a seventeenth aspect of the present invention is a maintenance method for a fuel cell power generation system including a desulfurizer that is replaced at regular intervals. It is characterized by connecting a pressure relief valve.

  A maintenance method for a fuel cell power generation system according to claim 18 of the present invention is a maintenance method for a fuel cell power generation system provided with a desulfurizer that is replaced at regular intervals. It is characterized by being connected to and transported.

  The maintenance method for a fuel cell power generation system according to claim 19 of the present invention is the maintenance method for a fuel cell power generation system according to claim 18, characterized in that the other containers to be connected are in a decompressed state before being connected. And

  The fuel cell power generation system maintenance method according to claim 20 of the present invention is the fuel cell power generation system maintenance method according to claim 19, wherein the other container to be connected is selected from zeolite or metal-supported zeolite. It is characterized by having an agent and in a reduced pressure state before connection.

  The maintenance method for a fuel cell power generation system according to claim 21 of the present invention is the maintenance method for a fuel cell power generation system according to claim 19 or 20, wherein the other internal pressure of the container to be connected is −10 kPa (at 25 ° C.). (Gauge pressure) of −150 kPa (gauge pressure at 25 ° C.) or more.

  A maintenance method for a fuel cell power generation system according to a twenty-second aspect of the present invention is the maintenance method for a fuel cell power generation system according to the eighteenth aspect, wherein the pressure relief is provided between the replaced used desulfurizer and another container. A valve and an on-off valve are provided.

  The fuel cell power generation system maintenance method according to claim 23 of the present invention is the fuel cell power generation system maintenance method according to claim 18, wherein the pressure installed between the replaced used desulfurizer and the other vessel is used. The other container is disposed on the gas outlet side of the pressure relief valve for extraction, and a pressure gauge is installed.

  A maintenance method for a fuel cell power generation system according to a twenty-fourth aspect of the present invention is the maintenance method for a fuel cell power generation system according to the eighteenth aspect, wherein the internal volume of another vessel connected to the replaced used desulfurizer is the desulfurization. It is characterized by being substantially the same volume as the internal volume of the vessel or less than the internal volume of the desulfurizer.

  The maintenance method for a fuel cell power generation system according to claim 25 of the present invention is the maintenance method for a fuel cell power generation system according to claim 18, wherein the amount of the zeolitic desulfurizing agent charged in another container to be connected is the desulfurization amount. 2 to 100% of the amount of zeolitic desulfurizing agent charged in the vessel.

  The fuel cell power generation system maintenance method according to claim 26 of the present invention is the fuel cell power generation system maintenance method according to claim 17 or claim 22, wherein the pressure when the used desulfurizer is not connected to another vessel is used. The operation set value of the pressure relief valve for release is 20 to 200 kPa, and the operation set value of the pressure release valve for pressure release when the used desulfurizer is connected to another container is 50 to 500 kPa.

  In the maintenance method for a fuel cell power generation system according to claim 27 of the present invention, the pressure in the other container to be connected is −100 ± 30 kPa (gauge pressure at 25 ° C.), and the replacement used desulfurizer is connected. A pressure relief valve and an on-off valve are installed between the other containers, the other container is disposed on the gas outlet side of the pressure relief pressure relief valve, and the pressure relief valve relief setting is set. The value is 50 to 500 kPa, and the amount of the zeolitic desulfurizing agent charged in another container to be connected is 2 to 100% of the amount of the zeolitic desulfurizing agent charged in the desulfurizer, It connects in the state which contacted the said other container.

The invention of claim 1 of the present invention is a fuel cell power generation system including a desulfurizer that is replaced at regular intervals, and includes a means for obtaining information on the operating status of the system, and is displayed on a display device of a management device. The replacement time of the desulfurizer is determined based on the information acquired by the means and / or the information acquired by the means displayed on the display device connected to the fuel cell power generation system.
For example, a management device that can confirm a plurality of distributed fuel cell power generation systems that can be managed by a manager who remotely manages power consumption, gas, water consumption, etc. of a user via a network such as the Internet or a telephone line. Displayed on a display device (for example, a remote controller's LCD screen, TV or personal computer screen), and the administrator or operator determines the replacement time based on the displayed information and contacts the person in charge of the maintenance company via the network The user can make a response by displaying it on a display device connected to the fuel cell power generation system itself of the user (for example, a television set or a personal computer screen installed in the home). The maintenance company is responsible for determining the replacement time based on the information displayed. As a notification sign on a display device such as a remote controller as shown in FIG. 3 described later connected to the user's fuel cell power generation system itself. Displayed, the user determined the replacement time based on the displayed information, and contacted the person in charge of the maintenance company without going through the network. There is a remarkable effect that it can be performed easily without fail.

  According to a second aspect of the present invention, in the fuel cell power generation system according to the first aspect, since the management device is a management device via a network, a plurality of distributed fuel cell power generation systems are connected via a network such as the Internet. It is displayed on the display device of the management device that can be confirmed by the administrator who is concentrated from a remote location, the administrator or operator determines the replacement time from the displayed information, and contacts the person in charge of the maintenance company via the network It has a further remarkable effect of being able to cope with it reliably.

  According to a third aspect of the present invention, in the fuel cell power generation system according to the first aspect, replacement of the desulfurizer is performed based on information acquired by the means displayed on a display device connected to the fuel cell power generation system. Since it is configured to determine the time, it is displayed as a notification sign on a display device such as a remote controller as shown in FIG. 3 to be described later, and the user determines the replacement time based on the displayed information and does not pass through the network. In addition, there is a further remarkable effect that the person in charge of the maintenance company can be contacted to ensure a response.

According to a fourth aspect of the present invention, in the fuel cell power generation system according to any one of the first to third aspects, the information acquired by the means is an elapsed time since the last installation of the desulfurizer. As a result, the use of inexpensive means such as a timer provides an even more remarkable effect that the exchange time can be easily understood and can be reliably handled.

  According to a fifth aspect of the present invention, in the fuel cell power generation system according to any one of the first to third aspects, the information acquired by the means is an operation time from the start to the stop of the fuel cell power generation system. Therefore, there is a further remarkable effect that the replacement time of the desulfurizer can be extended to the design life.

  According to a sixth aspect of the present invention, in the fuel cell power generation system according to any one of the first to third aspects, the information acquired by the means is a supply time of the raw fuel gas to the desulfurizer. Therefore, the replacement time is easy to understand, and there is a further remarkable effect that the replacement time of the desulfurizer can be extended to the design life.

  According to a seventh aspect of the present invention, in the fuel cell power generation system according to any one of the first to third aspects, the information acquired by the means is an integrated supply flow rate of the raw fuel gas to the desulfurizer. As a result, there is a further remarkable effect that the replacement time of the desulfurizer can be reliably extended to the design life.

  According to an eighth aspect of the present invention, in the fuel cell power generation system according to any one of the first to seventh aspects, is the information acquired by the means displayed on the user's remote control as a notification sign? Since it is configured to be displayed on a microcomputer meter via a dedicated line or on a display device of a management device via a network, the replacement time is easy to understand and can be dealt with more reliably. Play.

  A ninth aspect of the present invention is the fuel cell power generation system according to any one of the first to eighth aspects, wherein the information obtained by the means can be sorted by operating time and by area. As a result, there is a further remarkable effect that the maintenance can be efficiently performed in a short time.

  A tenth aspect of the present invention is the fuel cell power generation system according to any one of the first to ninth aspects, wherein the desulfurizer includes at least a zeolitic desulfurizing agent selected from zeolite or metal-supported zeolite. Since it is a desulfurizer, it has the further remarkable effect that it can desulfurize efficiently at normal temperature.

  The invention of claim 11 of the present invention is a start-up preparation method for a fuel cell power generation system provided with a desulfurizer that is replaced at regular intervals, and is equipped with a new desulfurizer that has been subjected to adsorption treatment by introducing raw fuel gas. When a new desulfurizer is installed and used in a fuel cell power generation system, a new desulfurizer that has been subjected to adsorption treatment by supplying hydrocarbon fuel gas to the new desulfurizer must be installed. For example, the fuel cell power generation system can be started up in a short time, and after starting, there is no problem of deteriorating the catalyst of the fuel reformer, and there is a remarkable effect that it can be easily and economically operated continuously.

  According to a twelfth aspect of the present invention, in the start-up preparation method for the fuel cell power generation system according to the eleventh aspect, the raw fuel gas is introduced into the new desulfurizer before or after the new desulfurizer is installed. Since the inside of the new desulfurizer is once depressurized before the raw fuel gas is introduced and the adsorption treatment is performed, there is a further remarkable effect that the adsorption treatment can be reliably performed in a shorter time.

  According to a thirteenth aspect of the present invention, in the start-up preparation method for the fuel cell power generation system according to the eleventh aspect, before installing the new desulfurizer, the inside of the new desulfurizer is not depressurized and the raw fuel gas is introduced. Since the new desulfurizer that has been subjected to the adsorption treatment and is subjected to the adsorption treatment is mounted, there is a further remarkable effect that the adsorption treatment can be performed in a shorter time because the pressure is not reduced.

  According to a fourteenth aspect of the present invention, in the start-up preparation method for the fuel cell power generation system according to the eleventh aspect, the total amount of the introduced raw fuel gases is 70 of the saturated adsorption amount at a container temperature of 30 ° C. of the new desulfurizer desulfurizer. Since the introduction of the raw fuel gas is stopped at ~ 95%, the adsorption speed is drastically reduced within the range of over 70% and 95%. However, if the introduction of the raw fuel gas is stopped at 70-95%, it takes less time. There is a further remarkable effect that the adsorption treatment can be performed.

  According to a fifteenth aspect of the present invention, in the fuel cell power generation system start-up preparation method according to any one of the twelfth to fourteenth aspects, the new desulfurizer internal pressure is -10 kPa (gauge pressure at 25 ° C.) or less. Since it is −150 kPa (gauge pressure at 25 ° C.) or more, there is a further remarkable effect that the adsorption treatment with the raw fuel gas can be performed more reliably in a shorter time.

  According to the sixteenth aspect of the present invention, in the start-up preparation method for the fuel cell power generation system according to the eleventh or twelfth aspect, when the pressure in the new desulfurizer into which the raw fuel gas is introduced becomes 0 kPa (gauge pressure). Since the introduction of the raw fuel gas is stopped, there is a further remarkable effect that the adsorption treatment with the raw fuel gas can be performed without damaging the new desulfurizer.

  The invention of claim 17 of the present invention is a maintenance method of a fuel cell power generation system provided with a desulfurizer that is replaced at regular intervals, and a pressure relief valve for pressure release is connected to the replaced used desulfurizer. After the replacement, for example, during transportation, the temperature of the desulfurizer rises, the hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed, and even if the internal pressure of the desulfurizer rises, the remarkable effect that the pressure can be released. Play.

  The invention of claim 18 of the present invention is a maintenance method of a fuel cell power generation system provided with a desulfurizer that is replaced at regular intervals, because the replaced used desulfurizer is connected to another container and transported. Even if the temperature of the desulfurizer rises during transportation and the hydrocarbon fuel gas adsorbed by the desulfurizing agent is desorbed, and the internal pressure of the desulfurizer rises, there is a remarkable effect that pressure can be released to other connected containers. .

  According to the nineteenth aspect of the present invention, in the maintenance method for the fuel cell power generation system according to the eighteenth aspect, since the other containers to be connected are in a reduced pressure state before being connected, the temperature of the desulfurizer increases during transportation. Thus, even if the hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed and the internal pressure of the desulfurizer rises, there is a further remarkable effect that the pressure can be easily released by another container in a reduced pressure state.

According to a twentieth aspect of the present invention, in the maintenance method for the fuel cell power generation system according to the nineteenth aspect, the other container to be connected is provided with a zeolitic desulfurization agent selected from zeolite or metal-supported zeolite, and before the connection is made. Since the desulfurizer temperature rises during transportation and the hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed during transportation, even if the desulfurizer internal pressure rises, A further remarkable effect is obtained in that pressure can be easily released by adsorbing to the filled zeolitic desulfurizing agent.
The amount of the zeolitic desulfurizing agent charged in the other container may be about 0.08 to 0.12 volume times the amount of the zeolitic desulfurizing agent charged in the desulfurizer.

  According to a twenty-first aspect of the present invention, in the maintenance method for a fuel cell power generation system according to the nineteenth or twentieth aspect, the pressure inside the other container to be connected is −10 kPa (gauge pressure at 25 ° C.) or less and −150 kPa ( Since the temperature of the desulfurizer rises during transportation and the hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed and the internal pressure of the desulfurizer rises, It is possible to obtain a further remarkable effect that the pressure can be easily and reliably released.

  According to the twenty-second aspect of the present invention, in the maintenance method for the fuel cell power generation system according to the eighteenth aspect, a pressure relief valve and an on-off valve are installed between the other containers connected to the replaced used desulfurizer. Even when the temperature of the desulfurizer rises during transportation and the hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed, and the internal pressure of the desulfurizer rises, the pressure can be easily and reliably released to other containers. Has a remarkable effect.

  According to a twenty-third aspect of the present invention, in the maintenance method for a fuel cell power generation system according to the eighteenth aspect, the gas outlet of the pressure relief valve for pressure release installed between the replaced used desulfurizer and another vessel connected thereto. Since the other vessel is placed on the side and a pressure gauge is installed, the temperature of the desulfurizer rises during transportation, hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed, and the internal pressure of the desulfurizer rises. However, there is a further remarkable effect that the pressure can be released from other containers more easily and surely.

  According to a twenty-fourth aspect of the present invention, in the maintenance method for a fuel cell power generation system according to the eighteenth aspect, the internal volume of another container connected to the used spent desulfurizer is substantially equal to the internal volume of the desulfurizer. Since it is the same volume or less than the inner volume of the desulfurizer, it has a further remarkable effect that it is lighter without being bulky more than necessary and is excellent in handleability.

  According to a twenty-fifth aspect of the present invention, in the maintenance method for a fuel cell power generation system according to the eighteenth aspect, the amount of the zeolitic desulfurizing agent charged in another container to be connected is the amount of the zeolitic desulfurization charged in the desulfurizer. Since the amount of the agent is 2 to 100%, even if the temperature of the desulfurizer rises during transportation and the hydrocarbon fuel gas adsorbed on the desulfurizer is desorbed and the internal pressure of the desulfurizer rises, other containers In addition, the pressure can be relieved substantially, and it is possible to reduce the weight without being unnecessarily bulky and to have a further remarkable effect of being easy to handle.

  According to a twenty-sixth aspect of the present invention, in the maintenance method of the fuel cell power generation system according to the seventeenth or twenty-second aspect, the operation setting of the pressure relief valve for pressure release when the used desulfurizer is not connected to another container. The value is 20 to 200 kPa, and when the used desulfurizer is connected to another vessel, the operation setting value of the pressure relief valve for pressure release is 50 to 500 kPa. There is a further remarkable effect that the container can be depressurized substantially reliably.

  In the invention of claim 27 of the present invention, the pressure in the other container to be connected is −100 ± 30 kPa (gauge pressure at 25 ° C.), and the pressure between the other container connected to the replaced used desulfurizer is between A pressure relief valve and an on-off valve are installed, the other container is disposed on the gas outlet side of the pressure relief valve, and the operation setting value of the pressure relief valve is 50 to 500 kPa. The amount of the zeolitic desulfurizing agent charged in the other vessel is set to 2 to 100% of the amount of the zeolitic desulfurizing agent charged in the desulfurizer, and the replaced used desulfurizer is in contact with the other vessel. The fuel cell power generation system maintenance method is characterized in that the temperature of the desulfurizer replaced during transportation rises and the hydrocarbon fuel gas adsorbed on the desulfurizing agent is desorbed, and the internal pressure of the desulfurizer is reduced. Even if the It provides the further significant advantage that the easily and reliably pressure vent is adsorbed to the zeolite-based desulfurizing agent packed substantially necessary amount to other containers in a reduced pressure state.

Next, the present invention will be described in detail based on embodiments with reference to the drawings.
FIG. 1 is an explanatory diagram schematically illustrating an example of an electronic network of a fuel cell power generation system according to the present invention.
The electronic network 30 shown in FIG. 1 includes a management company 34 including a plurality of distributed fuel cell power generation systems 31, a management device 32 that centrally manages them, and a display device 33 of the management device 32 via the Internet 35. Connected. The management company 34 is connected to an electric power company, a gas company, a water company, etc. through a dedicated line (not shown), and conducts a business commissioned by these companies.

  Each fuel cell power generation system 31 includes a desulfurizer (not shown) that is replaced at regular intervals, and also includes a unit that acquires information on the operation status of the system. A timer or the like (not shown) is provided, and information obtained by the timer is displayed on the display device 33 of the management device 34 via the Internet 35 of the electronic network 30, and replacement of the desulfurizer is performed by the information displayed on the display device 33. It is configured to determine the time. If the administrator or operator determines the replacement time based on the displayed information and contacts the person in charge of the maintenance company via the Internet 35, the replacement can be surely easily performed without overlooking the appropriate replacement time of the desulfurizer. .

FIG. 2 is an explanatory diagram schematically illustrating the configuration of the fuel cell power generation system of the present invention.
The fuel cell power generation system 31 includes a desulfurizer 4 for exchanging a hydrocarbon-based fuel gas such as natural gas, city gas, methanol, LPG, or butane at a predetermined period of time for desulfurization, and desulfurized fuel desulfurized by the desulfurizer 4 A fuel reformer 10 is provided for supplying gas, while supplying steam generated from clean water (not shown) and reforming the fuel gas into a hydrogen-rich reformed gas with reduced CO concentration. The reformed gas obtained by the apparatus 10 is supplied to the fuel electrode (AN), and this reformed gas and oxygen in the air supplied to the air electrode (CA) are reacted electrochemically to generate electric power and direct current. A fuel cell 13 for obtaining a voltage is provided.
Moreover, the inverter 35 which converts the direct current voltage into alternating current, and the control part 36 which controls them are provided.

The fuel cell power generation system 31 includes means 37 for acquiring information on the operating status of the fuel cell power generation system 31. Information detected by the means 37 is accumulated in the information section 38 and is transmitted by the transmission section 39 via the communication section 40. It can be transmitted to the management device 32 via the Internet 35.
The information unit 38 causes the display device 41 to display the accumulated information.

  The replacement time of the desulfurizer is displayed on the display device 41 connected to the fuel cell power generation system 31 possessed by the user based on the operating status information of the fuel cell power generation system 31, and the user determines the replacement time based on the displayed information. Then, if the person in charge of the maintenance company is contacted via the Internet 35, the replacement can be surely easily performed without overlooking the appropriate replacement time of the desulfurizer.

  FIG. 3 is an explanatory diagram showing an example of displaying information on the desulfurizer replacement time on a display device connected to the fuel cell power generation system.

  When the operation time displayed on the display device 41 (home remote control) where the operation time is stored in the fuel cell 13 is replaced with, for example, 3000 hours, the remote control in each home is about 2500 hours. The notice sign “It is time to replace the desulfurizer” lights up. The user sees the sign and contacts the maintenance company without going through the network, and requests replacement of the desulfurizer.

  In this case, fuel cell power generation systems (maintenance candidates) whose operation time exceeds 2500 hours are listed in Table 1 (display in order of system number), Table 2 (display in order of operation time), and Table 3 (display by proximity area). As shown in the figure, when there are multiple displays, there is a certain grace period from when the maintenance company is contacted until the replacement, so during that time, for example, a plurality of maintenance candidates shown in Table 3 are in close proximity. If an area, for example, area A (FC0004, FC0012, FC0007) is selected and replaced together, maintenance can be performed efficiently in a short time.

In addition, for example, when the operation time related to the desulfurizer replacement time is changed from 3000 hours to med, a notification sign “desulfurizer replacement time” is displayed on the display device 41 in about 2500 hours. Based on the displayed information, the user contacts the person in charge (contractor) of the maintenance company without going through the network and requests that the desulfurizer be replaced by 3000 hours.
In this case, fuel cell power generation systems (maintenance candidates) whose operation time exceeds 2500 hours are listed in Table 1 (display in order of system number), Table 2 (display in order of operation time), and Table 3 (display by proximity area). If a plurality of maintenance candidates are displayed as shown in the table, for example, one in the proximity area shown in Table 3, for example, one in the A area (FC0004, FC0012, FC0007) is selected and exchanged together. Then, maintenance can be performed efficiently in a short time.

  In addition, even if there is no portion storing the operation time in the fuel cell 13, if the system is a system in which the operation record of the fuel cell 13 is stored in the center server, judging from the operation time on the center server, It is also possible to display “desulfurizer replacement time” on the display device 41.

Next, maintenance preparation will be described.
FIG. 4 is an explanatory diagram for explaining an example in which the raw fuel gas is introduced after the air in the new desulfurizer 4 is forcibly separated by a vacuum pump and the adsorption process is performed.
When a maintenance candidate system is notified, preparation for maintenance is performed based on the notification. The purpose is to simplify the start-up of the system after replacement of the desulfurizer 4 by introducing the raw fuel gas into the desulfurizer 4 in advance and subjecting it to an adsorption treatment.
Of the valves V01 and VO2 attached to the desulfurizer 4, V02 on the side connected to the pretreatment device 40 is opened. The valve V11 is opened (V12 is closed), and the vacuum pump 41 is operated to perform suction. For example, when the gauge pressure indicated by the pressure gauge P reaches −100 kPa, the suction is stopped, the valve V11 is closed, and V12 is opened. The raw fuel gas LPG is charged into the desulfurizer 4 through V12, the internal pressure increases with the amount of charge, and the flow rate decreases. Reference numeral 42 denotes a flow meter, and 43 denotes a pressure reducing valve.

FIG. 5 is a graph showing the relationship between the amount of introduced raw fuel gas adsorbed (%) and the time with respect to the amount of adsorbed LPG (liter), the desulfurizer internal pressure (kPa), and the saturated adsorption amount of the new desulfurization agent at a container temperature of 30 ° C. It is.
As shown in FIG. 5, from the vicinity where the adsorption ratio exceeds 70%, the amount of introduced LPG increases and the desulfurizer internal pressure increase rate decreases, and from the vicinity where the adsorption ratio exceeds 75%, the desulfurizer internal pressure is almost constant (0 kPa). ), And the increase in the amount of introduced LPG is decreasing.
Completion of filling can be determined by (1) when the adsorption ratio reaches 75%, (2) when the desulfurizer internal pressure becomes 0 kPa, or the like.

  Note that the above method is not limited to maintenance, and it is possible to reliably start the fuel cell power generation system for the first time by pre-processing the desulfurizer 4 during assembly before shipment of the fuel cell power generation system. become.

  After the treatment by the above method, the valves (V11, V12) of the pretreatment device 40 are closed, the connection with the piping of the desulfurizer 4 is disconnected, and the desulfurizer 4 is taken out. Connect the pretreated desulfurizer 4 to the piping of the fuel cell power generation system, attach the panel of the main body, and start up normally.

  In the above description, an example in which the pretreatment device 40 is used has been shown. However, a vacuum pump 41, a flow meter 42, a decompression pressure are added to the raw fuel gas supply line 3 having the raw fuel gas on-off valve 2 shown in FIG. The valve 43, the valve V11, and the like can be appropriately installed and pretreated.

(1) On the other hand, a pressure relief valve SV01 is attached to the removed used desulfurizer 4 as shown in FIG. 6, and the attached valve V02 is opened.
If the pressure inside the used desulfurizer 4 rises due to a temperature rise during transportation or the like, the pressure relief valve SV01 operates to prevent the internal pressure of the desulfurizer 4 from rising. The operating pressure of the pressure relief valve SV01 is 150 ± 50 kPa (below the breakthrough pressure of the desulfurizer 4).

(2) As another method, the removed used desulfurizer 4 is provided with another dummy container 4-1 as shown in FIG. 7, and each valve on the side where the other container 4-1 is connected. (V02, V22) is opened. The other container 4-1 of the dummy may not contain anything inside, but it is preferable that the inside be evacuated (gauge pressure -100 kPa). Also, if the inside is filled with a zeolite-type desulfurizing agent equivalent to that of the desulfurizer 4 and the inside is evacuated (gauge pressure -100 kPa), the temperature of the used desulfurizer 4 will rise more reliably and desulfurize. Even if the hydrocarbon fuel gas adsorbed on the agent is desorbed and the internal pressure of the desulfurizer 4 is increased, the pressure can be released.

(3) Further, as another method, there is an advanced method of the above (2), and the removed used desulfurizer 4 is mounted with another dummy container 4-1 as shown in FIG. A pressure relief valve SV01 is attached, and the attached valves V02 and V22 are opened. Normally, when another decompressed dummy container 4-1 is connected, the entire system should maintain a reduced pressure state, but just in case, the pressure relief valve SV 01 is connected and the pressure inside the desulfurizer 4 is increased. Use to remove.

(4) Further, as another method, there is a fusion type method of the above (1) and (2), and the used desulfurizer 4 is attached with a pressure relief valve SV01 as shown in FIG. A dummy container 4-1 is attached to the pressure release side, and the valves V02 and V22 are opened.
Only when the pressure in the desulfurizer 4 rises and the pressure relief valve SV01 is activated, the other container 4-1 of the dummy functions and adsorbs excess LPG.

(5) Further, as another method, there is an advanced method of the above (4), and the used desulfurizer 4 is attached with a pressure relief valve SV01 as shown in FIG. The other container 4-1 of the dummy is attached, and the pressure gauge P (P21) is attached to the line on the pressure relief valve SV01 side of the other container 4-1 of the dummy.
By connecting the pressure gauge P (P21) and recording the indicated value of the pressure gauge P (P21) before opening the valves V02 and V22 (the gauge may be marked), the pressure relief valve It is possible to determine whether SV01 has been operated, that is, whether another dummy container 4-1 has adsorbed surplus LPG. If the value after the pressure gauge P (P21) is connected to the value of the pressure gauge P (P21) before the other dummy container 4-1 is connected, it can be determined that the pressure relief valve SV01 has been operated.
As a result, regarding the other container 4-1 of the dummy in which the pressure relief valve SV01 did not operate, it can be determined that LPG adsorption has not occurred, and can be reused for removing another desulfurizer 4 as it is. Leads to cost reduction.

FIG. 11 shows the internal pressure of the desulfurizer (gauge pressure at about −70 kPa at 25 ° C.) when the desulfurizer is cooled to nearly 20 ° C. with the LPG adsorbed at a rate of 100% at about 50 ° C. (gauge pressure at 0 kPa at 25 ° C.). ) And temperature.
At 20 ° C. (normal temperature), the saturated adsorption amount of the desulfurizing agent at a container temperature of 30 ° C. is about 85%.

FIG. 12 shows the relationship between the desulfurizer internal pressure (gauge pressure at kPa 25 ° C.) and temperature when the temperature is raised to nearly 70 ° C. with LPG adsorbed at about 30 ° C. at an adsorption rate of 100%. It is a graph.
When the temperature is increased to about 70 ° C. while adsorbed at an adsorption rate of 100% at about 30 ° C., the saturated adsorption amount at the container temperature of 30 ° C. is reduced, and the raw fuel gas is released, so that the internal pressure of the desulfurizer increases.
Assuming that 30 liters of LPG is filled at 30 ° C. with respect to 1 liter of the desulfurizing agent of the desulfurizer, the desulfurizer internal pressure is atmospheric pressure 101 kPa, and the desulfurizer internal pressure (kPa) when the temperature is raised to 70 ° C. is Actually, it becomes 260 kPa.
Similarly, the desulfurizer internal pressure calculated by the gas equation of state (PV = nRT) is 114 kPa, assuming that 1 liter of desulfurizer in the desulfurizer is filled with 30 liters of LPG at 30 ° C.
The difference between the actual internal pressure of 260 kPa and the calculated internal pressure of 114 kPa is because LPG adsorbed on the desulfurizing agent was desorbed when the temperature was raised to 70 ° C. This LPG desorption amount is calculated to be 1.28 liters.
Therefore, in this example, another container 4-1, which is filled with an adsorbent (zeolite desulfurizing agent) capable of adsorbing an LPG desorption amount of 1.28 liters (specifically, about 0.1 liter) is used. That's fine.

  The description of the above embodiment is for explaining the present invention, and does not limit the invention described in the claims or reduce the scope. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

The fuel cell power generation system of the present invention, for example, remotely manages a plurality of distributed fuel cell power generation systems through a network such as the Internet or a telephone line to centrally manage user power, gas, water consumption, and the like. Displayed on the display device of the management device that can be confirmed by the administrator (for example, the liquid crystal screen of a remote controller, the screen of a television or personal computer), and the administrator or operator determines the replacement time based on the displayed information, and the maintenance company Or a display device connected to the fuel cell power generation system itself of the user (for example, the screen of a television or personal computer installed in the home) Etc.) and the user determines the replacement time based on the displayed information. By contacting the maintenance company staff without going through the network, it is possible to respond to the problem by using it for industrial use. High value.
According to the start-up preparation method for a fuel cell power generation system of the present invention, when a new desulfurizer is installed and used in the fuel cell power generation system, the hydrocarbon fuel gas is supplied to the new desulfurizer and subjected to adsorption treatment. The fuel cell power generation system can be started up in a short time, and there is no problem of degrading the catalyst of the fuel reformer after starting up. Because it has a great effect, it has high industrial utility value.
Further, according to the maintenance method of the fuel cell power generation system of the present invention, for example, if the raw fuel gas is introduced and replaced in advance before setting a new desulfurizer, the fuel cell power generation system can be started up in a short time. Since there is no problem of deteriorating the catalyst of the fuel reformer, and the remarkable effect that the continuous operation can be performed easily and economically is obtained, the industrial utility value is high.

It is explanatory drawing which illustrates typically an example of the electronic network of the fuel cell power generation system of this invention. It is explanatory drawing which illustrates typically the structure of the fuel cell power generation system of this invention. It is explanatory drawing which shows the example which displays the information regarding a desulfurizer replacement | exchange time on the display apparatus connected to the fuel cell power generation system. It is explanatory drawing explaining the example which introduce | transduces raw fuel gas into a novel desulfurizer and performs an adsorption process after evacuating with a vacuum pump. It is a graph which shows the relationship between the adsorption | suction ratio (%) of the introduce | transduced raw fuel gas with respect to the saturated adsorption amount in the container temperature of 30 degreeC of introduction | transduction LPG amount (liter), desulfurizer internal pressure (kPa), and the container temperature of 30 degreeC. It is explanatory drawing explaining the state which attached the pressure relief valve to the used desulfurizer which removed. It is explanatory drawing explaining the state which attached the other container to the used used desulfurizer. It is explanatory drawing explaining the state which attached the pressure relief valve and the other container to the used used desulfurizer removed. It is explanatory drawing explaining the other state which attached the pressure relief valve and the other container to the used used desulfurizer. It is explanatory drawing explaining the state which attached the pressure relief valve, the other container, and the pressure gauge to the removed used desulfurizer. It is a graph which shows the relationship between a desulfurizer internal pressure and temperature. It is a graph which shows the relationship between a desulfurizer internal pressure and temperature. It is explanatory drawing which shows the conventional fuel cell power generation system.

Explanation of symbols

4 Desulfurizer 4-1 Other vessel 30 Electronic network 31 Fuel cell power generation system 32 Management device 33, 41 Display device 35 Internet SV01 Pressure relief valve for pressure release

Claims (27)

  A fuel cell power generation system provided with a desulfurizer that is replaced at regular intervals, comprising a means for obtaining information on the operating status of the system, the information obtained by the means displayed on the display device of the management device, and A fuel cell power generation system configured to determine the replacement timing of the desulfurizer based on information acquired by the means displayed on a display device connected to the fuel cell power generation system.   The fuel cell power generation system according to claim 1, wherein the management device is a management device via a network.   2. The fuel cell power generation system according to claim 1, wherein a replacement timing of the desulfurizer is determined based on information acquired by the means displayed on a display device connected to the fuel cell power generation system. .   The fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is an elapsed time since the desulfurizer was last attached.   The fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is an operation time from start to stop of the fuel cell power generation system.   The fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is a supply time of the raw fuel gas to the desulfurizer.   The fuel cell power generation system according to any one of claims 1 to 3, wherein the information acquired by the means is an integrated supply flow rate of raw fuel gas to the desulfurizer.   The information acquired by the means is displayed as a notification sign on the user's remote control, displayed on the microcomputer meter via a dedicated line, or displayed on the display device of the management device via the network. The fuel cell power generation system according to any one of claims 1 to 7, wherein the fuel cell power generation system is configured as described above.   The fuel cell power generation system according to any one of claims 1 to 8, wherein the fuel cell power generation system has a function of sorting the information acquired by the means in order of operation time and by area.   10. The fuel cell power generation system according to claim 1, wherein the desulfurizer is a desulfurizer including at least a zeolitic desulfurizing agent selected from zeolite or metal-supported zeolite.   A fuel cell power generation system comprising a desulfurizer that is exchanged at regular intervals, wherein the fuel cell power generation system is equipped with a new desulfurizer in which raw fuel gas is introduced and adsorbed. How to prepare for startup.   Before installing the new desulfurizer or after installing the new desulfurizer, before introducing the raw fuel gas into the new desulfurizer, once the pressure inside the new desulfurizer is reduced, the raw fuel gas is introduced and adsorbed. The start preparation method of the fuel cell power generation system according to claim 11.   12. The fuel cell according to claim 11, wherein before the new desulfurizer is installed, the inside of the new desulfurizer is not decompressed, the raw fuel gas is introduced and subjected to the adsorption treatment, and the new desulfurizer subjected to the adsorption treatment is installed. Preparation method for starting the power generation system.   12. The fuel cell power generation according to claim 11, wherein the introduction of the raw fuel gas is stopped when the total amount of the introduced raw fuel gas is 70 to 95% of the saturated adsorption amount of the new desulfurizer desulfurization agent at a container temperature of 30 ° C. How to prepare for system startup.   15. The fuel cell according to claim 12, wherein the pressure in the new desulfurizer is −10 kPa (gauge pressure at 25 ° C.) or less and −150 kPa (gauge pressure at 25 ° C.) or more. Preparation method for starting the power generation system.   The preparation for starting the fuel cell power generation system according to claim 11 or 12, wherein the introduction of the raw fuel gas is stopped when the pressure in the new desulfurizer into which the raw fuel gas has been introduced becomes 0 kPa (gauge pressure). Method.   A maintenance method for a fuel cell power generation system including a desulfurizer that is replaced at regular intervals, wherein a pressure relief valve for pressure release is connected to the replaced used desulfurizer. .   A maintenance method for a fuel cell power generation system provided with a desulfurizer that is replaced at regular intervals, wherein the replacement used desulfurizer is connected to another container and transported. .   19. The maintenance method for a fuel cell power generation system according to claim 18, wherein the other containers to be connected are in a reduced pressure state before being connected.   The maintenance method for a fuel cell power generation system according to claim 19, wherein the other container to be connected is provided with a zeolitic desulfurization agent selected from zeolite or metal-supported zeolite, and is in a reduced pressure state before being connected.   21. The fuel cell power generation system according to claim 19 or 20, wherein the pressure in the other container to be connected is -10 kPa (gauge pressure at 25 ° C.) or less and −150 kPa (gauge pressure at 25 ° C.) or more. Maintenance method.   19. The maintenance method for a fuel cell power generation system according to claim 18, wherein a pressure relief valve and an on-off valve are installed between another vessel connected to the replaced used desulfurizer.   The pressure gauge is installed by arranging the other container on the gas outlet side of the pressure relief valve for pressure release installed between the other containers connected to the replaced used desulfurizer. Maintenance method of the fuel cell power generation system in Japan.   19. The fuel cell according to claim 18, wherein the internal volume of another container connected to the replaced used desulfurizer is substantially the same as the internal volume of the desulfurizer or less than the internal volume of the desulfurizer. Maintenance method for the power generation system.   19. The fuel cell power generation system according to claim 18, wherein the amount of the zeolitic desulfurizing agent filled in another container to be connected is 2 to 100% of the amount of the zeolitic desulfurizing agent charged in the desulfurizer. Maintenance method.   When the used desulfurizer is not connected to another vessel, the pressure relief valve operating set value is 20 to 200 kPa, and when the used desulfurizer is connected to another vessel, the pressure relief pressure relief valve is activated. The maintenance method for a fuel cell power generation system according to claim 17 or 22, wherein the set value is 50 to 500 kPa.   The pressure in the other container to be connected is -100 ± 30 kPa (gauge pressure at 25 ° C), and a pressure relief valve and open / close valve for pressure relief are installed between the replaced used desulfurizer and the other container. Zeolite desulfurization in which the other container is arranged on the gas outlet side of the pressure relief valve for pressure relief, the operation setting value of the pressure relief valve for pressure relief is 50 to 500 kPa, and the other container to be connected is filled The amount of the agent is 2 to 100% of the amount of the zeolitic desulfurizing agent charged in the desulfurizer, and the replaced used desulfurizer and the other container are connected in contact with each other. Maintenance method for battery power generation system.

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