JP2011165588A - Polymer electrolyte fuel cell power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polymer electrolyte fuel cell power generation system easily discharging water remaining in a gas passage of a separator even when a plurality of stacks are connected in parallel. <P>SOLUTION: The polymer electrolyte fuel cell power generation system 100 includes a control device 120 closing a valve 113B to temporarily stop supplying oxidation gas 1 to at least one stack 111B in stacks 111B, 111C excluding a stack 111A which is detected to have at least one of abnormalities that a voltage value is equal to or lower than an abnormal voltage threshold VA1 and a voltage variation value is equal to or higher than an abnormal voltage variation threshold VB1, based on information from voltmeters 122A-122C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a polymer electrolyte fuel cell power generation system.

  A polymer electrolyte fuel cell power generation system distributes a fuel gas containing hydrogen gas and a cell in which a proton conductive solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxide electrode having conductivity and gas permeability. A fuel gas channel and a stack in which an oxidant gas channel for passing an oxidant gas containing oxygen gas is formed and a plurality of conductive separators are alternately stacked, and the fuel gas is a fuel of the separator of the stack When the oxidizing gas is supplied from the gas flow channel to the fuel electrode of the cell and the oxidizing gas flow channel of the separator of the stack is supplied to the oxidizing electrode of the cell, hydrogen gas and oxygen gas are Reacts electrochemically to generate water and to generate electric power.

  The water generated by the electrochemical reaction flows through the gas flow path of the separator together with the remaining gas that has not contributed to the electrochemical reaction, and is discharged to the outside of the stack for separation and recovery. ing.

Japanese Patent Laid-Open No. 11-067260

  By the way, in the polymer electrolyte fuel cell power generation system as described above, when a plurality of the stacks are connected in parallel with respect to the circulation of the gas, the flow rate of the gas with respect to each stack tends to decrease. The water generated by the electrochemical reaction is less likely to be discharged to the outside of the stack by the remaining gas that has not contributed to the electrochemical reaction, and stays in the gas flow path of the separator, so that power generation efficiency is improved. There was a tendency to decrease.

  Therefore, the present invention provides a polymer electrolyte fuel cell power generation system capable of easily discharging water staying in a gas flow path of a separator even when a plurality of stacks are connected in parallel. The purpose is to do.

  A solid polymer fuel cell power generation system according to a first invention for solving the above-described problem is a fuel gas in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidation electrode, and fuel gas is circulated. A plurality of stacks in which separators each formed with a flow path and an oxidizing gas flow path for flowing oxidizing gas are alternately stacked; and a plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack Fuel gas supply means for supplying the fuel gas to the stack in parallel, and the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack. An oxidant gas supply means for supplying the oxidant gas to each of the stacks. Based on the information from the oxidizing gas inflow adjusting means for adjusting, the voltage measuring means for measuring the voltage of each stack, and the information from the voltage measuring means, the voltage value is below the abnormal voltage threshold and the voltage fluctuation value is abnormal. The oxidizing gas inflow adjusting means is adapted to temporarily stop the supply of the oxidizing gas to at least one of the other stacks excluding the stack in which at least one abnormality that is equal to or greater than a voltage fluctuation threshold is detected. And a control means for controlling.

  The polymer electrolyte fuel cell power generation system according to a second aspect of the present invention is the first aspect, wherein the voltage value of the stack in which the abnormality is detected is based on the information from the voltage measuring means. When detecting at least one resumption condition that is greater than or equal to a resumption voltage threshold value greater than the threshold value and a voltage fluctuation value that is less than or equal to the resumption voltage variation threshold value that is less than the abnormal voltage variation threshold value, the control unit temporarily stops supplying the oxidizing gas. The oxidizing gas inflow adjusting means is controlled to resume the supply of the oxidizing gas to the stack.

  The polymer electrolyte fuel cell power generation system according to a third aspect of the present invention is that, in the second aspect, the supply of the oxidizing gas is temporarily stopped before detecting the restart condition of the stack in which the abnormality is detected. When the voltage value of the stack is equal to or lower than the lower limit voltage threshold, the control means temporarily stops the supply of the oxidizing gas to the stack once the supply of the oxidizing gas is stopped based on the information from the voltage measuring means. The oxidizing gas inflow adjusting means is controlled so as to resume.

  The polymer electrolyte fuel cell power generation system according to a fourth aspect of the invention is the third aspect of the invention, comprising three or more of the stacks, and the voltage value of the stack that has been temporarily resumed from supplying the oxidizing gas is When the threshold voltage is greater than or equal to a re-stop voltage threshold value that is greater than the lower limit voltage threshold value, the control means is based on information from the voltage measurement means and is at least two of the other stacks except the stack where the abnormality is detected. The oxidizing gas inflow adjusting means is controlled so as to stop the supply of the oxidizing gas to the two stacks again.

  The polymer electrolyte fuel cell power generation system according to a fifth aspect of the present invention is the oxidant gas pressure in the stack for measuring the pressure of the oxidant gas in each of the stacks in any of the second to fourth aspects Measuring means, and before detecting the restart condition of the stack in which the abnormality is detected, the pressure value of the oxidizing gas in the stack where the supply of the oxidizing gas is temporarily stopped is equal to or lower than a lower limit oxidizing gas pressure threshold value. Then, based on the information from the oxidizing gas pressure measuring means in the stack, the control means flows in the oxidizing gas so as to temporarily resume the supply of the oxidizing gas to the stack once the supply of the oxidizing gas is stopped. The adjustment means is controlled.

  The polymer electrolyte fuel cell power generation system according to a sixth aspect of the invention is the fifth aspect of the invention, wherein the oxidizing gas in the stack is provided with three or more of the stacks and the supply of the oxidizing gas is temporarily resumed. When the pressure value is equal to or greater than the restart oxidant gas pressure threshold value greater than the lower limit oxidant gas pressure threshold value, the control unit detects the abnormality based on information from the in-stack oxidant gas pressure measurement unit. The oxidizing gas inflow adjusting means is controlled so that the supply of the oxidizing gas to at least two of the other stacks excluding the stack is stopped again.

  A polymer electrolyte fuel cell power generation system according to a seventh aspect of the invention is a cell in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidation electrode, a fuel gas flow path for flowing fuel gas, and an oxidation for flowing oxidizing gas A plurality of stacks in which separators each having a gas flow path are alternately stacked, and the fuel gas in parallel to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack Fuel gas supply means for supplying the oxidizing gas, and oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack, A fuel gas inflow control for adjusting the inflow of the fuel gas to each stack interposed between the fuel gas supply means and each stack, respectively. And at least one abnormality in which the voltage value is equal to or lower than the abnormal voltage threshold and the voltage fluctuation value is equal to or higher than the abnormal voltage fluctuation threshold, based on information from the voltage measuring means and the voltage measuring means for measuring the voltage of each stack. Control means for controlling the fuel gas inflow adjusting means so as to temporarily stop the supply of the fuel gas to at least one of the other stacks excluding the stack detected. It is characterized by that.

  A polymer electrolyte fuel cell power generation system according to an eighth aspect of the present invention is the polymer electrolyte fuel cell power generation system according to any one of the first to sixth aspects, wherein the fuel gas supply unit is interposed between the fuel gas supply means and the stacks. Fuel gas inflow adjusting means for adjusting the inflow of the fuel gas to the stack is provided, and the control means further excludes the stack in which the abnormality is detected based on information from the voltage measuring means. The fuel gas inflow adjusting means is controlled so as to temporarily stop the supply of the fuel gas to at least one of the other stacks.

  A polymer electrolyte fuel cell power generation system according to a ninth invention is the voltage value of the stack in which the abnormality is detected based on information from the voltage measuring means in the seventh or eighth invention. When the control means detects at least one resumption condition that is greater than or equal to the resumption voltage threshold greater than the abnormal voltage threshold and whose voltage fluctuation value is less than or equal to the resumption voltage fluctuation threshold smaller than the abnormal voltage fluctuation threshold, the control means supplies the fuel gas The fuel gas inflow adjusting means is controlled so as to resume the supply of the fuel gas to the stack once stopped.

  The polymer electrolyte fuel cell power generation system according to a tenth aspect of the invention is the ninth aspect of the invention, comprising three or more stacks and before detecting the restart condition of the stack in which the abnormality is detected. When the voltage value of the stack once the supply of the fuel gas is stopped is equal to or lower than a lower limit voltage threshold value, the control means temporarily stops the supply of the fuel gas based on information from the voltage measurement means. The fuel gas inflow adjusting means is controlled so as to temporarily resume the supply of the fuel gas to the fuel cell.

  The polymer electrolyte fuel cell power generation system according to a tenth aspect of the present invention is the solid polymer fuel cell power generation system according to the tenth aspect of the present invention, wherein the voltage value of the stack where the supply of the fuel gas is temporarily resumed is larger than the lower limit voltage threshold value. When the voltage threshold is equal to or higher than the threshold voltage, the control unit is configured to supply the fuel gas to at least two of the other stacks excluding the stack in which the abnormality is detected based on information from the voltage measurement unit. The fuel gas inflow adjusting means is controlled so as to stop the supply again.

  A polymer electrolyte fuel cell power generation system according to a twelfth aspect of the invention is the fuel in a stack that measures the pressure of the fuel gas in each of the stacks according to any of the ninth to tenth aspects of the invention. Gas pressure measuring means, and before detecting the restart condition of the stack in which the abnormality has been detected, the fuel gas pressure value in the stack where the supply of the fuel gas is temporarily stopped is a lower limit fuel gas pressure threshold value When the following conditions are satisfied, the control means is configured to temporarily resume the supply of the fuel gas to the stack once the supply of the fuel gas is stopped based on the information from the fuel gas pressure measuring means in the stack. It controls the gas inflow adjusting means.

  A polymer electrolyte fuel cell power generation system according to a thirteenth aspect of the invention is the twelfth aspect of the invention, wherein the solid polymer fuel cell power generation system includes three or more of the stacks and the supply of the fuel gas is temporarily resumed. When the pressure value of the fuel gas becomes equal to or greater than the restart fuel gas pressure threshold value that is greater than the lower limit fuel gas pressure threshold value, the control means detects the abnormality based on information from the fuel gas pressure measuring means in the stack. The fuel gas inflow adjusting means is controlled so as to stop the supply of the fuel gas to at least two of the other stacks excluding the stack.

  A polymer electrolyte fuel cell power generation system according to a fourteenth aspect of the invention is a cell in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidation electrode, a fuel gas flow channel for flowing fuel gas, and an oxidizing gas. A plurality of stacks in which separators each formed with an oxidizing gas flow path are alternately stacked, and the fuel gas is supplied to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack. Fuel gas supply means for supplying in parallel, and oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack; An oxidant gas inflow for adjusting the inflow of the oxidant gas to the stacks, respectively, interposed between the oxidant gas supply means and the stacks. Adjusting means, oxidizing gas reverse flow preventing means for preventing reverse flow of the oxidizing gas from the oxidizing gas outlet of each stack to the inside of each stack, and voltage for measuring the voltage of each stack, respectively Based on information from the measuring means, the oxidizing gas pressure measuring means in the stack for measuring the pressure of the oxidizing gas in each stack, and the voltage measuring means, the voltage value is less than the abnormal voltage threshold and the voltage fluctuation range is Supply of the oxidizing gas is temporarily performed on at least one of the stacks detected at least one abnormality exceeding the abnormal voltage fluctuation threshold value or at a specified operation time from the plurality of stacks. After controlling the oxidizing gas inflow adjusting means to stop, the voltage measuring means and the oxidizing gas pressure measuring means in the stack are reduced. On the basis of the information from the other, the lower limit oxidizing gas in which the voltage value of the stack in which the abnormality is detected is lower than the lower voltage threshold value smaller than the abnormal voltage threshold value and the pressure value of the oxidizing gas is smaller than the steady operation pressure value. Control means for controlling the oxidizing gas inflow adjusting means so as to resume the supply of the oxidizing gas to the stack when at least one of the pressure threshold value or less is detected or the supply of the oxidizing gas is stopped for a specified time. It is characterized by having.

  According to a fifteenth aspect of the present invention, the polymer electrolyte fuel cell power generation system according to the fourteenth aspect of the present invention is provided between the oxidizing gas outlet of each of the plurality of stacks and each of the oxidizing gas reverse inflow prevention means. In addition, an oxidation gas buffer tank is provided.

  A polymer electrolyte fuel cell power generation system according to a sixteenth aspect of the invention is a cell in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidation electrode, a fuel gas flow channel for flowing fuel gas, and an oxidizing gas. A plurality of stacks in which separators each formed with an oxidizing gas flow path are alternately stacked, and the fuel gas is supplied to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack. Fuel gas supply means for supplying in parallel, and oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack; And a fuel gas inflow for adjusting the inflow of the fuel gas to each of the stacks interposed between the fuel gas supply means and each of the stacks, respectively. Regulating means, fuel gas reverse inflow preventing means for preventing reverse inflow of the fuel gas from the fuel gas discharge port of each stack into the inside of the stack, and voltage for measuring the voltage of each stack, respectively Based on the information from the measuring means, the fuel gas pressure measuring means in the stack for measuring the pressure of the fuel gas in each stack, and the voltage measuring means, the voltage value is below the abnormal voltage threshold and the voltage fluctuation range is Supply of the fuel gas is temporarily performed on at least one of the stacks detected at least one abnormality exceeding the abnormal voltage fluctuation threshold or selected at a specified operation time from the plurality of stacks. After controlling the fuel gas inflow adjusting means to stop, the voltage measuring means and the fuel gas pressure measuring means in the stack are reduced. On the basis of the information from the other, the lower limit fuel gas in which the voltage value of the stack in which the abnormality is detected is equal to or lower than the lower limit voltage threshold value smaller than the abnormal voltage threshold value and the pressure value of the fuel gas is smaller than the steady operation pressure value. Control means for controlling the fuel gas inflow adjusting means so as to resume the supply of the fuel gas to the stack when at least one of the pressure threshold value or less is detected or when the supply stop of the fuel gas is performed for a specified time It is characterized by having.

  A polymer electrolyte fuel cell power generation system according to a seventeenth aspect of the present invention is the fourteenth or fifteenth aspect of the present invention, wherein each of the fuel cell power generation systems is interposed between the fuel gas supply means and each of the stacks. Fuel gas inflow adjusting means for adjusting the inflow of the fuel gas to the stack, and a fuel gas backflow for preventing the backflow of the fuel gas from the fuel gas discharge port of each stack to the inside of each stack, respectively. And a fuel gas pressure measuring means for measuring the pressure of the fuel gas in each of the stacks, and the control means further includes the stack in which the abnormality is detected, or the selection. After the fuel gas inflow adjusting means is controlled so as to temporarily stop the supply of the fuel gas to the stacked stack, the voltage measuring means and the stack Based on information from at least one of the fuel gas pressure measuring means, the voltage value of the stack in which the abnormality is detected is equal to or lower than a lower limit voltage threshold value smaller than the abnormal voltage threshold value, and the pressure value of the fuel gas is a steady operation pressure value. The fuel gas inflow adjustment so that the supply of the fuel gas to the stack is resumed when at least one of the lower fuel gas pressure threshold values lower than the lower limit is detected or when the supply of the fuel gas is stopped for a specified time It is characterized by controlling the means.

  The polymer electrolyte fuel cell power generation system according to an eighteenth aspect of the invention is the sixteenth or seventeenth aspect of the invention, wherein the fuel gas outlet and each fuel gas backflow of each of the plurality of stacks are provided. A fuel gas buffer tank is provided between the inlet prevention means and the inlet prevention means.

  According to the polymer electrolyte fuel cell power generation system according to the present invention, water staying in the gas flow path of the separator can be easily discharged even when a plurality of stacks are connected in parallel.

It is a schematic block diagram of the principal part of 1st embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram of the principal part of 2nd embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram of the principal part of 3rd embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram of the principal part of the other form of 1st embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram of the principal part of the other form of 2nd embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram of the principal part of the other form of 3rd embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention.

  Embodiments of a polymer electrolyte fuel cell power generation system according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments described with reference to the drawings.

[First embodiment]
A first embodiment of a polymer electrolyte fuel cell power generation system according to the present invention will be described with reference to FIG.

  In FIG. 1, 111A to 111C are fuels that circulate a fuel gas containing hydrogen gas and a cell in which a solid polymer electrolyte membrane having proton conductivity is sandwiched between a fuel electrode and an oxidation electrode having conductivity and gas permeability. The stack is formed by alternately stacking a plurality of gas separators and conductive separators, each of which is formed with an oxidant gas channel that circulates an oxidant gas containing oxygen gas, and a plurality (three in this embodiment) are disposed. ing.

  An oxidant gas supply source 112 that is an oxidant gas supply unit that supplies the oxidant gas 1 is connected to the oxidant gas inlets of the stacks 111A to 111C via valves 113A to 113C that are oxidant gas inflow adjusting units. The oxidant gas supply source 112 supplies the oxidant gas 1 in parallel to the stacks 111A to 111C so as to circulate the oxidant gas 1 through the oxidant gas flow paths of the separators of the stacks 111A to 111C, respectively. It can be done.

  The oxidizing gas discharge ports of the stacks 111A to 111C are connected to a receiving port of a drain pot 114 that is an oxidizing gas gas-liquid separation unit having a drain valve 114a. The gas outlet of the drain pot 114 communicates outside the system.

  Between the oxidant gas inlets of the stacks 111A to 111C and the valves 113A to 113C, pressure gauges 121A to 121A, which are oxidant gas pressure measuring means in the stack for measuring the pressure in the oxidant gas inlets of the stacks 111A to 111C. 121C is provided. The stacks 111A to 111C are provided with voltmeters 122A to 122C, respectively, which are voltage measuring means for measuring the voltages of the stacks 111A to 111C.

  The pressure gauges 121 </ b> A to 121 </ b> C and the voltmeters 122 </ b> A to 122 </ b> C are electrically connected to an input unit of the control device 120 that is a control unit. The output unit of the control device 120 is electrically connected to the valves 113A to 113C, respectively. The control device 120 is based on information from the pressure gauges 121A to 121C and the voltmeters 122A to 122C. The opening and closing of the valves 113A to 113C can be controlled (details will be described later).

  In order to avoid complication of the drawings, descriptions of fuel gas systems such as fuel gas supply means, fuel gas inflow adjustment means, fuel gas gas-liquid separation means, and fuel gas pressure measuring means in the stack are omitted. However, it is configured and provided in the same manner as the oxidizing gas system such as the oxidizing gas supply means, the oxidizing gas inflow adjusting means, the oxidizing gas gas-liquid separation means, and the in-stack oxidizing gas pressure measuring means. Also, a temperature control system such as a temperature control water distribution means is provided in the same manner as in the case of a conventional polymer electrolyte fuel cell power generation system, although the description is omitted in order to avoid complication of the drawing. It has been.

  Next, the operation of the thus configured polymer electrolyte fuel cell power generation system 100 according to this embodiment will be described.

  First, when the oxidizing gas 1 is supplied from the oxidizing gas supply source 112 and supplied to the inside from the oxidizing gas supply ports of the stacks 111A to 111C, the oxidizing gas 1 flows through the oxidizing gas flow path of the separator. Supplied to the oxidation electrode of the cell, and the oxygen gas is supplied from the fuel gas supply source to the fuel electrode of the cell through the fuel gas flow path of the separators of the stacks 111A to 111C. By electrochemically reacting with hydrogen gas in the fuel gas in the cell, electric power is generated and water 3 is generated.

  The water 3 on the oxidation electrode side generated with the electrochemical reaction flows through the oxidation gas flow path of the separator together with the remaining oxidation gas 1 that has not contributed to the electrochemical reaction, and the stacks 111A to 111A. It is discharged to the outside from the oxidizing gas outlet of 111C, separated and recovered by the drain pot 114, and the remaining oxidizing gas 1 is discharged outside the system.

  Similarly, the water 3 on the fuel electrode side flows through the fuel gas flow path of the separator together with the remaining fuel gas that did not contribute to the electrochemical reaction, and is discharged from the stacks 111A to 111C to the outside. The fuel gas is separated and recovered in a drain pot, and the remaining fuel gas is discharged out of the system and is post-processed.

  During the power generation operation in this way, when the water 3 generated in association with the electrochemical reaction stays in the oxidizing gas flow path of the separator of the stack 111A, for example, It becomes difficult for the oxidizing gas 1 to flow through the oxidizing gas flow path, the effective power generation area decreases, and an abnormality such as a decrease or fluctuation in the generated voltage occurs.

  Such an abnormality of the generated voltage is detected, that is, for example, an abnormal voltage threshold VA1 (VA0> VA1, for example, 0.7 V / cell) whose voltage value is smaller than a steady voltage value VA0 (for example, 0.8 V / cell). When at least one of the following is detected and the abnormal voltage fluctuation threshold VB1 (VB0 <VB1, ± 2%, for example) greater than the steady voltage fluctuation value VB0 (eg, ± 0.5%) is detected, Based on the information from the voltmeter 122A, the control device 120 detects the oxidizing gas 1 to one of the other stacks 111B and 111C (for example, the stack 111B) excluding the stack 111A that has detected the abnormality. The valve 113B is controlled to be closed so as to temporarily stop the supply of.

  As a result, the oxidizing gas 1 from the oxidizing gas supply source 112 is supplied to the stacks 111A and 111C without being supplied to the stack 111B, so that the oxidizing gas 1 to the stacks 111A and 111C is supplied. The supply amount increases (1.5 times that during steady operation), and the flow rate of the oxidizing gas 1 flowing through the oxidizing gas flow path of the separators of the stacks 111A and 111C increases.

  Therefore, the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A is pushed out from the oxidizing gas flow path by the oxidizing gas 1 having an increased flow velocity, and the oxidizing gas 1 At the same time, it is discharged to the outside from the oxidizing gas outlet of the stack 111 </ b> A, and separated and collected by the drain pot 114.

  In this way, it is detected that the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A has been removed and the power generation voltage of the stack 111A has been recovered normally, that is, for example, a voltage value Is a restart voltage threshold VA2 (VA1 <VA2, for example, 0.75 V / cell) that is greater than the abnormal voltage threshold VA1 and a voltage fluctuation width is smaller than the abnormal voltage fluctuation threshold VB1 (VB1> VB2). , For example, ± 1%) or less, the control device 120 detects that the supply of the oxidizing gas 1 to the stack 111B once stopped based on the information from the voltmeter 122A. The valve 113B is controlled to be opened so that the supply of the oxidizing gas 1 is resumed.

  As a result, the oxidizing gas 1 from the oxidizing gas supply source 112 is supplied to all the stacks 111A to 111C and returns to the initial operating state.

  By the way, when the supply of the oxidant gas 1 is stopped, the stack 111B performs a power generation operation while consuming the oxidant gas 1 supplied to the inside before the supply stop, so that it can generate steady power for a while. However, the voltage gradually decreases and power generation operation becomes impossible.

  Therefore, in the unlikely event that the power generation voltage of the stack 111A recovers normally, that is, before the restart condition is detected, the power generation operation capability of the stack 111B that has stopped supplying the oxidizing gas 1 is greatly reduced, For example, the lower limit oxidizing gas pressure threshold value PA3 (PA0> PA3, for example, 0 kPaG) where the pressure value of the oxidizing gas 1 in the oxidizing gas inlet of the stack 111B is smaller than the steady oxidizing gas pressure value PA0 (for example, 50 to 400 kPaG). (Atmospheric pressure)) and when the voltage value of the stack 111B is at least one of the lower limit voltage threshold VA3 (VA0> VA3, for example, 0.5 V / cell) lower than the steady voltage value VA0. In the meantime, the control device 120 is arranged in front of the stack 111B where the supply of the oxidizing gas 1 is stopped. Based on information from at least one pressure gauge 121B and the voltmeter 122B, opens controlling the valve 113B to temporarily resume the supply of the oxidizing gas 1 into the stack 111B.

  In this way, the power generation operation capacity of the stack 111B that has been temporarily restarted to supply the oxidizing gas 1 is restored, that is, for example, the pressure value of the oxidizing gas 1 in the oxidizing gas inlet of the stack 111B is the lower limit oxidation. Re-stop oxidation gas pressure threshold PA4 greater than gas pressure threshold PA3 (PA3 <PA4, for example, 50 to 400 kPaG (≈PA0)) or more, and voltage value of the stack 111B is greater than the lower limit voltage threshold VA3 When at least one state equal to or higher than VA4 (VA3 <VA4, for example, about 0.8 V / cell (≈VA0)), the control device 120 uses information from at least one of the pressure gauge 121B and the voltmeter 122B. Based on the other stacks 111B, 1 excluding the stack 111A in which the abnormality is detected (In the present embodiment, all remaining stack 111B, 111C) two of 1C the valve 113B to the supply of the oxidizing gas 1 into to stop again, closing controls 113C.

  As a result, the oxidizing gas 1 from the oxidizing gas supply source 112 is supplied to the stack 111A without being supplied to the stacks 111B and 111C. Therefore, the supply amount of the oxidizing gas 1 to the stack 111A Further increases (three times the steady operation), and the flow rate of the oxidizing gas 1 flowing through the oxidizing gas flow path of the separator of the stack 111A further increases.

  For this reason, the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A that could not be exhausted only by stopping the supply of the oxidizing gas 1 to one stack 111B further increases the flow velocity. The oxidant gas 1 is surely pushed out of the oxidant gas flow path, is discharged together with the oxidant gas 1 from the oxidant gas discharge port of the stack 111A, and is gas-liquid separated in the drain pot 114. Collected.

  In this way, the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A is removed, and the power generation voltage of the stack 111A is restored to normal, that is, for example, the voltage value is resumed. When detecting at least one of the restart conditions where the voltage threshold value VA2 (for example, 0.75 V / cell) or more and the voltage variation range are equal to or less than the restart voltage variation threshold value VB2 (for example, ± 1%), the control device 120 Based on the information from the total 122A, the valves 113B and 113C are controlled to be opened so that the supply of the oxidizing gas 1 to the stacks 111B and 111C once stopped from supplying the oxidizing gas 1 is resumed.

  As a result, the oxidizing gas 1 from the oxidizing gas supply source 112 is supplied to all the stacks 111A to 111C and returns to the initial operating state.

  Since the fuel gas system operates in the same manner as in the case of the oxidant gas system described above, by replacing the term “oxidant gas” in the description of the oxidant gas system with “fuel gas”, The description of the oxidizing gas system described above will be replaced with that description.

  Therefore, according to the polymer electrolyte fuel cell power generation system 100 according to the present embodiment, even when a plurality of stacks 111A to 111C are connected in parallel, the water staying in the gas flow paths of the stacks 111A to 111C. 3 can be easily discharged.

[Second Embodiment]
A second embodiment of the polymer electrolyte fuel cell power generation system according to the present invention will be described with reference to FIG. However, by using the same reference numerals as those used in the description of the first embodiment described above for the same parts as those of the first embodiment described above, the first embodiment described above. The description overlapping with the description in is omitted.

  As shown in FIG. 2, valves 215 </ b> A to 215 </ b> C, which are means for preventing backflow of oxidizing gas, are interposed between the receiving port of the drain pot 114 and the oxidizing gas discharge ports of the stacks 111 </ b> A to 111 </ b> C, respectively. .

  The pressure gauges 121A to 121C and the voltmeters 122A to 122C are electrically connected to an input unit of a control device 220 which is a control means. The output unit of the control device 220 is electrically connected to the valves 113A to 113C and the valves 215A to 215C, respectively. The control device 120 is connected to the pressure gauges 121A to 121C and the voltmeters 122A to 122C. On the basis of this information, the opening and closing of the valves 113A to 113C and 215A to 215C can be controlled (details will be described later).

  In this embodiment, as in the case of the above-described embodiment, the fuel gas supply means, the fuel gas inflow adjustment means, the fuel gas gas-liquid separation means, the fuel gas pressure measuring means in the stack, and the fuel gas reverse inflow prevention Although the description of the fuel gas system such as means is omitted, the oxidizing gas supply means, the oxidizing gas inflow adjusting means, the oxidizing gas gas-liquid separating means, the oxidizing gas pressure measuring means in the stack, and the oxidizing gas reverse inflow described above. It is configured and provided in the same manner as the oxidizing gas system such as the prevention means. In addition, the temperature control system such as the temperature control water distribution means is omitted in the same manner as in the above-described embodiment, but the same as in the case of the conventional polymer electrolyte fuel cell power generation system. Are provided.

  In such a polymer electrolyte fuel cell power generation system 200 according to this embodiment, electric power can be generated by operating in the same manner as in the first embodiment described above.

  During the power generation operation, when the water 3 generated by the electrochemical reaction stays in the oxidizing gas flow path of the separator of the stack 111A, for example, the first described above. As described in the embodiment, the oxidizing gas 1 is less likely to flow through the oxidizing gas flow path of the separator, the effective power generation area is reduced, and abnormalities such as a decrease in generation voltage and fluctuations occur.

  Such an abnormality of the generated voltage, that is, for example, as in the case of the first embodiment described above, an abnormal voltage threshold value VA1 (the voltage value of which is smaller than the steady voltage value VA0 (for example, 0.8 V / cell)). VA0> VA1, for example, 0.7V / cell) or less, and abnormal voltage fluctuation threshold VB1 (VB0 <VB1, for example, ± 2%) where the voltage fluctuation value is larger than the steady voltage fluctuation value VB0 (for example, ± 0.5%) ) When at least one of the above abnormalities is detected, the control device 220 temporarily stops the supply of the oxidizing gas 1 into the stack 111A where the abnormality is detected based on the information from the voltmeter 122A. The valves 113A and 215A are controlled to be closed.

  Thereby, the stack 111A in which the abnormality is detected consumes the oxidizing gas 1 supplied therein, and the pressure and voltage of the oxidizing gas flow path of the separator gradually decrease. Then, the controller 220 sets the lower limit oxidizing gas pressure threshold PA3 (PA0>) in which the pressure value of the oxidizing gas 1 in the oxidizing gas receiving port of the stack 111A is smaller than the steady oxidizing gas pressure value PA0 (for example, 50 to 400 kPaG). PA3, for example, 0 kPaG (atmospheric pressure)) or less and the voltage value of the stack 111A is at least one of a lower limit voltage threshold value VA3 (VA0> VA3, for example, 0.5 V / cell) less than the steady voltage value VA0, Based on the information from at least one of the pressure gauge 121A and the voltmeter 122A, the valves 113A and 215A are controlled to be opened so that the supply of the oxidizing gas 1 to the stack 111A is resumed.

  Then, in the stack 111A, the oxidizing gas 1 rapidly flows in the oxidizing gas flow path of the separator, and the water 3 staying in the oxidizing gas flow path of the separator flows into the oxidizing gas flow. The gas 1 is vigorously pushed out of the oxidizing gas flow path, is discharged to the outside together with the oxidizing gas 1 from the oxidizing gas discharge port of the stack 111A, and is separated and collected in the drain pot 114.

  As a result, the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A is removed, and the power generation voltage of the stack 111A is restored to normal.

  The fuel gas system operates in the same manner as in the case of the oxidant gas system described above, as in the case of the first embodiment described above. "Is replaced with" fuel gas ", so that the description of the oxidant gas system is replaced with that description.

  Therefore, according to the polymer electrolyte fuel cell power generation system 200 according to the present embodiment, even when the plurality of stacks 111A to 111C are connected in parallel as in the case of the first embodiment described above, The water 3 staying in the gas flow paths of the stacks 111A to 111C can be easily discharged.

[Third embodiment]
A third embodiment of the polymer electrolyte fuel cell power generation system according to the present invention will be described with reference to FIG. However, for the same parts as those in the first and second embodiments described above, the same reference numerals as those used in the description of the first and second embodiments described above are used, so that the first described above. The description overlapping with the description in the second embodiment is omitted.

  As shown in FIG. 3, oxidant gas buffer tanks 314A to 314C having drain valves 314Aa to 314Ca are provided between the oxidant gas discharge ports of the stacks 111A to 111C and the valves 215A to 215C, respectively. The buffer tanks 314A to 314C also function as gas-liquid separation means for oxidizing gas.

  In this embodiment, as in the case of the above-described embodiment, the fuel gas supply means, the fuel gas inflow adjustment means, the fuel gas gas-liquid separation means, the fuel gas pressure measuring means in the stack, and the fuel gas reverse inflow prevention Although the description of the fuel gas system such as the means and the fuel gas buffer tank is omitted, the oxidizing gas supply means, the oxidizing gas inflow adjusting means, the oxidizing gas gas-liquid separation means, and the in-stack oxidizing gas pressure measurement are described. Means, an oxidizing gas reverse inflow preventing means, and an oxidizing gas system such as an oxidizing gas buffer tank. In addition, the temperature control system such as the temperature control water distribution means is omitted in the same manner as in the above-described embodiment, but the same as in the case of the conventional polymer electrolyte fuel cell power generation system. Are provided.

  In such a polymer electrolyte fuel cell power generation system 300 according to this embodiment, electric power can be generated by operating in the same manner as in the first and second embodiments described above.

  During the power generation operation, if the water 3 generated by the electrochemical reaction stays in the oxidizing gas flow path of the separator of the stack 111A, for example, the first and second described above. As described in the second embodiment, the oxidizing gas 1 is less likely to flow through the oxidizing gas flow path of the separator, the effective power generation area is reduced, and abnormalities such as a decrease in generation voltage and fluctuations occur. .

  Such an abnormality of the generated voltage, that is, for example, as in the first and second embodiments described above, an abnormal voltage threshold whose voltage value is smaller than the steady voltage value VA0 (for example, 0.8 V / cell). Abnormal voltage fluctuation threshold value VB1 (VB0 <VB1, for example ±±) where VA1 (VA0> VA1, for example, 0.7 V / cell) or less and the voltage fluctuation value is larger than the steady voltage fluctuation value VB0 (for example ± 0.5%) 2%) When at least one abnormality is detected, the control device 220 determines that the abnormality has occurred based on information from the voltmeter 122A, as in the case of the second embodiment described above. The valves 113A and 215A are controlled to be closed so as to temporarily stop the supply of the oxidizing gas 1 into the stack 111A.

  As a result, the oxidizing gas 1 present in the stack 111A and the buffer tank 314A where the abnormality is detected is consumed, the pressure and voltage inside the stack 111A gradually decrease, and the inside of the stack 111A. As the pressure decreases, the pressure in the buffer tank 314A gradually decreases.

  Then, the controller 220 sets the lower limit oxidizing gas pressure threshold PA3 (PA0>) in which the pressure value of the oxidizing gas 1 in the oxidizing gas receiving port of the stack 111A is smaller than the steady oxidizing gas pressure value PA0 (for example, 50 to 400 kPaG). PA3, for example, 0 kPaG (atmospheric pressure)) or less and the voltage value of the stack 111A is at least one of a lower limit voltage threshold value VA3 (VA0> VA3, for example, 0.5 V / cell) less than the steady voltage value VA0, As in the case of the second embodiment described above, based on information from at least one of the pressure gauge 121A and the voltmeter 122A, the supply of the oxidizing gas 1 to the stack 111A is resumed. The valves 113A and 215A are controlled to be opened.

  Then, the oxidizing gas 1 rapidly flows in the oxidizing gas flow path of the separator of the stack 111A and the buffer tank 316A, and the water 3 staying in the oxidizing gas flow path of the separator is rapidly changed. The oxidant gas 1 that has flowed into the stack is vigorously pushed out of the oxidant gas flow path, and is discharged together with the oxidant gas 1 into the buffer tank 314A from the oxidant gas discharge port of the stack 111A. The

  Thus, as in the case of the second embodiment described above, the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A is removed, and the stack 111A has a generated voltage. It will recover normally.

  The fuel gas system operates in the same manner as in the case of the oxidant gas system described above, as in the case of the first and second embodiments described above. By replacing “oxidizing gas” with “fuel gas”, the description of the oxidizing gas system is replaced with the description.

  Therefore, according to the polymer electrolyte fuel cell power generation system 300 according to this embodiment, even when the plurality of stacks 111A to 111C are connected in parallel, as in the first and second embodiments described above. The water 3 staying in the gas flow paths of the stacks 111A to 111C can be easily discharged, as well as between the gas discharge ports of the stacks 111A to 111C and the valves 215A to 215C. Since the buffer tanks 314A to 314C are provided in the second embodiment described above, the amount of gas to be rapidly circulated into the gas flow path of the separator of the stacks 111A to 111C in which the abnormality is detected is provided. Therefore, the water 3 staying in the gas flow path of the stacks 111A to 111C can be increased to the second. It can be more reliably discharged than in the facilities forms.

[Other Embodiments]
In the first embodiment described above, when the control device 120 detects the abnormality of the stack 111A, the oxidizing gas 1 to the other stack 111B other than the stack 111A is not detected. The valve 113B is controlled to be closed so that the supply is temporarily stopped, and before the power generation voltage of the stack 111A is normally recovered, the power generation operation capability of the stack 111B in which the supply of the oxidizing gas 1 is stopped is greatly reduced. The valve 113B is controlled to be opened so as to temporarily resume the supply of the oxidizing gas 1 to the stack 111B from which the supply of the oxidizing gas 1 is stopped. Supply of the oxidizing gas 1 to all the remaining stacks 111B and 111C except for the stack 111A in which an abnormality is detected By closing the valves 113B and 113C so as to stop again, the water 3 staying in the oxidizing gas flow path of the separator of the stack 111A is surely discharged. For example, when the control means detects an abnormality of a certain stack, the valve is closed and controlled so as to temporarily stop the supply of the gas to all other stacks except the stack. The water staying in the oxidizing gas flow path of the separator of the stack in which the abnormality is detected can be reliably discharged at a time.

  In the second and third embodiments described above, when the abnormality in the generated voltage described above is detected based on the information from the voltmeter 122A, the control device 220 detects that the abnormality has occurred in the stack 111A. After closing the valves 113A and 215A so as to temporarily stop the supply of the oxidizing gas 1 to the oxidizer, the oxidation in the stack 111A is performed based on information from at least one of the pressure gauge 121A and the voltmeter 122A. The supply of the oxidizing gas 1 to the stack 111A is resumed when the pressure value of the gas 1 is at least one of the lower limit oxidizing gas pressure threshold PA3 and the voltage value of the stack 111A is lower than the lower limit voltage threshold VA3. By opening the valves 113A and 215A, the front of the separator of the stack 111A is controlled. The water 3 staying in the oxidant gas flow path is removed as necessary. However, as another embodiment, for example, when the power generation operation is performed for a specified time, the control means is at least one of the plurality of stacks. When one of the stacks is sequentially selected and the valve is closed to temporarily stop the supply of the gas into the selected stack, the supply of the gas is stopped for a specified time. By opening the valve so as to resume the supply of the gas to the water, the water staying in the oxidizing gas flow path of the separator of each stack may be periodically removed sequentially. Is possible.

  In the second and third embodiments described above, valves 215A to 215C are provided between the inlet of the drain pot 114 and the oxidizing gas outlets of the stacks 111A to 111C, and the pressure gauges 121A to 121A are provided. The control device 120 controls the opening and closing of the valves 215A to 215C based on information from 121C and the voltmeters 122A to 122C, but as another embodiment, for example, as an oxidizing gas reverse inflow prevention means, If a check valve is provided instead of the valves 215A to 215C, the opening / closing control by the control means can be omitted.

  Further, in each of the above-described embodiments, the case of the polymer electrolyte fuel cell power generation system 100, 200, 300 in which all the gas discharged from the stacks 111A to 111C is discharged out of the system has been described. As another embodiment, for example, as shown in FIGS. 4 to 6, a circulation blower 416 is provided so that most of the gas discharged from the stacks 111 </ b> A to 111 </ b> C is supplied again to the stacks 111 </ b> A to 111 </ b> C. Even in the case of the polymer electrolyte fuel cell power generation system 400, 500, 600 in which the gas can be reused, it is possible to obtain the same operational effects as in the first to third embodiments described above. it can.

  Moreover, in each embodiment mentioned above, although the case where the three stacks 111A-111C were connected in parallel was demonstrated, as another embodiment, for example, when connecting four or more stacks in parallel, Even when the stacks are connected in parallel, it can be applied in the same manner as in the above-described embodiments.

  Further, in each of the above-described embodiments, the case where the water 3 staying in the gas flow path of the separator is discharged in both the oxidizing gas system and the fuel gas system has been described. In this case, only in one of the oxidizing gas system and the fuel gas system (especially the oxidizing gas system that generates a large amount of water in association with the electrochemical reaction), the water staying in the gas flow path of the separator is discharged. However, the same effect as the case of each embodiment mentioned above can be acquired.

  In the polymer electrolyte fuel cell power generation system according to the present invention, even if a plurality of stacks are connected in parallel, the water staying in the gas flow path of the separator can be easily discharged. It can be used extremely beneficially.

DESCRIPTION OF SYMBOLS 1 Oxidizing gas 3 Water 100 Solid polymer fuel cell power generation system 111A-111C Stack 112 Oxidizing gas supply source 113A-113C Valve 114 Drain pot 114a Drain valve 120 Controller 121A-121C Pressure gauge 122A-122C Voltmeter 200 Solid polymer Type fuel cell power generation system 215A to 215C valve 300 polymer electrolyte fuel cell power generation system 314A to 314C buffer tank 314Aa to 314Ca drain valve 400, 500, 600 polymer electrolyte fuel cell power generation system 416 circulation blower

Claims (18)

A plurality of cells in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidization electrode, and separators each having a fuel gas flow channel for flowing fuel gas and an oxidant gas flow channel for flowing oxidizing gas are alternately stacked. Stack,
Fuel gas supply means for supplying the fuel gas in parallel to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack;
An oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack;
An oxidizing gas inflow adjusting means for adjusting the inflow of the oxidizing gas to each of the stacks, respectively interposed between the oxidizing gas supply means and each of the stacks;
Voltage measuring means for measuring the voltage of each of the stacks;
Based on information from the voltage measuring means, at least one of the other stacks except the stack in which at least one abnormality in which the voltage value is equal to or lower than the abnormal voltage threshold and the voltage fluctuation value is equal to or higher than the abnormal voltage fluctuation threshold is detected. And a control means for controlling the oxidizing gas inflow adjusting means so as to temporarily stop the supply of the oxidizing gas to one of the stacks. In the polymer electrolyte fuel cell power generation system according to claim 1,
Based on the information from the voltage measuring means, the voltage value of the stack in which the abnormality is detected is greater than or equal to the resumption voltage threshold greater than the abnormal voltage threshold, and the resumption voltage fluctuation is smaller than the abnormal voltage fluctuation threshold. When the control unit detects at least one restart condition below a threshold, the control unit controls the oxidizing gas inflow adjusting unit so as to restart the supply of the oxidizing gas to the stack once the supply of the oxidizing gas is stopped. A polymer electrolyte fuel cell power generation system characterized by The polymer electrolyte fuel cell power generation system according to claim 2,
Before detecting the restart condition of the stack in which the abnormality has been detected, when the voltage value of the stack, in which the supply of the oxidizing gas is temporarily stopped, becomes equal to or lower than a lower limit voltage threshold, the control means Based on the information of the solid polymer, the oxidizing gas inflow adjusting means is controlled so as to temporarily resume the supply of the oxidizing gas to the stack once the supply of the oxidizing gas is stopped. Fuel cell power generation system. In the polymer electrolyte fuel cell power generation system according to claim 3,
With three or more stacks,
When the voltage value of the stack for which the supply of the oxidizing gas has been temporarily resumed is equal to or greater than a re-stop voltage threshold value that is greater than the lower limit voltage threshold value, the control means determines the abnormality based on information from the voltage measurement means. The oxidizing gas inflow adjusting means is controlled so that the supply of the oxidizing gas to at least two of the other stacks excluding the detected stack is stopped again. Solid polymer fuel cell power generation system. In the polymer electrolyte fuel cell power generation system according to any one of claims 2 to 4,
In-stack oxidizing gas pressure measuring means for measuring the pressure of the oxidizing gas in each stack,
The control means when the pressure value of the oxidizing gas in the stack, where the supply of the oxidizing gas is temporarily stopped, becomes less than or equal to a lower limit oxidizing gas pressure threshold before detecting the restart condition of the stack where the abnormality is detected However, based on the information from the in-stack oxidizing gas pressure measuring means, the oxidizing gas inflow adjusting means is controlled so as to temporarily resume the supply of the oxidizing gas to the stack once the supply of the oxidizing gas is stopped. A solid polymer fuel cell power generation system characterized by In the polymer electrolyte fuel cell power generation system according to claim 5,
With three or more stacks,
When the pressure value of the oxidizing gas in the stack in which the supply of the oxidizing gas has been temporarily resumed is equal to or higher than the restarting oxidizing gas pressure threshold value that is larger than the lower limit oxidizing gas pressure threshold value, the control means Based on the information from the pressure measuring means, the oxidizing gas flows so as to stop the supply of the oxidizing gas to at least two of the other stacks except the stack where the abnormality is detected. A solid polymer fuel cell power generation system characterized by controlling an adjusting means. A plurality of cells in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidization electrode, and separators each having a fuel gas flow channel for flowing fuel gas and an oxidant gas flow channel for flowing oxidizing gas are alternately stacked. Stack,
Fuel gas supply means for supplying the fuel gas in parallel to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack;
An oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack;
Fuel gas inflow adjusting means for adjusting the inflow of the fuel gas to each of the stacks respectively interposed between the fuel gas supply means and each of the stacks;
Voltage measuring means for measuring the voltage of each of the stacks;
Based on information from the voltage measuring means, at least one of the other stacks except the stack in which at least one abnormality in which the voltage value is equal to or lower than the abnormal voltage threshold and the voltage fluctuation value is equal to or higher than the abnormal voltage fluctuation threshold is detected. And a control means for controlling the fuel gas inflow adjusting means so as to temporarily stop the supply of the fuel gas to one of the stacks. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 6,
Fuel gas inflow adjusting means for adjusting the inflow of the fuel gas to each of the stacks respectively interposed between the fuel gas supply means and each of the stacks,
The control means is further configured to temporarily supply the fuel gas to at least one of the other stacks excluding the stack in which the abnormality is detected based on information from the voltage measuring means. A solid polymer fuel cell power generation system characterized by controlling the fuel gas inflow adjusting means to stop. In the polymer electrolyte fuel cell power generation system according to claim 7 or 8,
Based on the information from the voltage measuring means, the voltage value of the stack in which the abnormality is detected is greater than or equal to the resumption voltage threshold greater than the abnormal voltage threshold, and the resumption voltage fluctuation is smaller than the abnormal voltage fluctuation threshold. When the control unit detects at least one restart condition below a threshold, the control unit controls the fuel gas inflow adjusting unit to restart the supply of the fuel gas to the stack once the supply of the fuel gas is stopped. A polymer electrolyte fuel cell power generation system characterized by The polymer electrolyte fuel cell power generation system according to claim 9,
With three or more stacks,
Before detecting the restart condition of the stack in which the abnormality has been detected, when the voltage value of the stack that has temporarily stopped the supply of fuel gas falls below a lower threshold voltage threshold, the control means Based on the information, the fuel gas inflow adjusting means is controlled so as to temporarily resume the supply of the fuel gas to the stack once the supply of the fuel gas is stopped. Fuel cell power generation system. The polymer electrolyte fuel cell power generation system according to claim 10,
When the voltage value of the stack for which the supply of the fuel gas has been temporarily resumed is equal to or greater than a re-stop voltage threshold value that is greater than the lower limit voltage threshold value, the control means determines the abnormality based on information from the voltage measurement means. The fuel gas inflow adjusting means is controlled to stop the supply of the fuel gas to at least two of the other stacks excluding the detected stack again. Solid polymer fuel cell power generation system. The polymer electrolyte fuel cell power generation system according to any one of claims 9 to 11,
In-stack fuel gas pressure measuring means for measuring the pressure of the fuel gas in each of the stacks,
The control means when the pressure value of the fuel gas in the stack, where the supply of the fuel gas is temporarily stopped, becomes less than or equal to a lower limit fuel gas pressure threshold before detecting the restart condition of the stack where the abnormality is detected However, based on the information from the fuel gas pressure measuring means in the stack, the fuel gas inflow adjusting means is controlled so as to temporarily resume the supply of the fuel gas to the stack once the supply of the fuel gas is stopped. A solid polymer fuel cell power generation system characterized by The polymer electrolyte fuel cell power generation system according to claim 12,
With three or more stacks,
When the pressure value of the fuel gas in the stack in which the supply of the fuel gas has been temporarily resumed is equal to or higher than a restart fuel gas pressure threshold value that is greater than the lower limit fuel gas pressure threshold value, the control means Based on the information from the pressure measuring means, the fuel gas inflow is stopped so that the supply of the fuel gas to at least two of the other stacks excluding the stack where the abnormality is detected is stopped again. A solid polymer fuel cell power generation system characterized by controlling an adjusting means. A plurality of cells in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidization electrode, and separators each having a fuel gas flow channel for flowing fuel gas and an oxidant gas flow channel for flowing oxidizing gas are alternately stacked. Stack,
Fuel gas supply means for supplying the fuel gas in parallel to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack;
An oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack;
An oxidizing gas inflow adjusting means for adjusting the inflow of the oxidizing gas to each of the stacks, respectively interposed between the oxidizing gas supply means and each of the stacks;
An oxidizing gas reverse inflow prevention means for preventing the oxidizing gas from flowing backward into the stack from the oxidizing gas outlet of each stack;
Voltage measuring means for measuring the voltage of each of the stacks;
In-stack oxidizing gas pressure measuring means for measuring the pressure of the oxidizing gas in each stack,
Based on the information from the voltage measuring means, the stack in which at least one abnormality in which the voltage value is equal to or less than the abnormal voltage threshold and the voltage fluctuation width is equal to or greater than the abnormal voltage fluctuation threshold is detected, or defined from among the plurality of stacks After controlling the oxidizing gas inflow adjusting means to temporarily stop the supply of the oxidizing gas with respect to at least one of the stacks selected every operating time, the voltage measuring means and the oxidizing gas pressure measurement in the stack Based on information from at least one of the means, the voltage value of the stack in which the abnormality is detected is equal to or lower than a lower limit voltage threshold value smaller than the abnormal voltage threshold value, and the lower limit value where the pressure value of the oxidizing gas is smaller than the steady operation pressure value. When at least one of the oxidizing gas pressure threshold value or lower is detected, or when the supply of the oxidizing gas is stopped for a specified time, the stack Polymer electrolyte fuel cell power generation system characterized by comprising a control means for controlling the oxidizing gas inlet adjustment means to resume the supply of the oxidizing gas. The polymer electrolyte fuel cell power generation system according to claim 14,
A solid polymer fuel cell power generation system, characterized in that an oxidizing gas buffer tank is disposed between the oxidizing gas outlet of each of the plurality of stacks and each of the oxidizing gas reverse inflow prevention means. . A plurality of cells in which a solid polymer electrolyte membrane is sandwiched between a fuel electrode and an oxidization electrode, and separators each having a fuel gas flow channel for flowing fuel gas and an oxidant gas flow channel for flowing oxidizing gas are alternately stacked. Stack,
Fuel gas supply means for supplying the fuel gas in parallel to the plurality of stacks so that the fuel gas flows through the fuel gas flow path of the separator of the stack;
An oxidizing gas supply means for supplying the oxidizing gas in parallel to the plurality of stacks so that the oxidizing gas flows through the oxidizing gas flow path of the separator of the stack;
Fuel gas inflow adjusting means for adjusting the inflow of the fuel gas to each of the stacks respectively interposed between the fuel gas supply means and each of the stacks;
A fuel gas reverse inflow prevention means for preventing reverse inflow of the fuel gas from the fuel gas discharge port of each stack into the stack;
Voltage measuring means for measuring the voltage of each of the stacks;
In-stack fuel gas pressure measuring means for measuring the pressure of the fuel gas in each of the stacks;
Based on the information from the voltage measuring means, the stack in which at least one abnormality in which the voltage value is equal to or less than the abnormal voltage threshold and the voltage fluctuation width is equal to or greater than the abnormal voltage fluctuation threshold is detected, or defined from among the plurality of stacks After controlling the fuel gas inflow adjusting means so as to temporarily stop the supply of the fuel gas to at least one of the stacks selected every operation time, the voltage measuring means and the fuel gas pressure measurement in the stack Based on information from at least one of the means, the voltage value of the stack in which the abnormality is detected is equal to or lower than a lower limit voltage threshold value that is smaller than the abnormal voltage threshold value, and the lower limit is lower than the steady-state operating pressure value. When at least one of the fuel gas pressure threshold value or lower is detected, or when the supply stop of the fuel gas is performed for a specified time, the stack Polymer electrolyte fuel cell power generation system characterized by comprising a control means for controlling the fuel gas inlet regulating means to resume the supply of the fuel gas. The polymer electrolyte fuel cell power generation system according to claim 14 or 15,
Fuel gas inflow adjusting means for adjusting the inflow of the fuel gas to each of the stacks respectively interposed between the fuel gas supply means and each of the stacks;
A fuel gas reverse inflow prevention means for preventing reverse inflow of the fuel gas from the fuel gas discharge port of each stack into the stack;
An in-stack fuel gas pressure measuring means for measuring the pressure of the fuel gas in each of the stacks,
The control means further controls the fuel gas inflow adjusting means so as to temporarily stop the supply of the fuel gas to the stack in which the abnormality is detected or the selected stack, Based on information from at least one of the voltage measuring means and the fuel gas pressure measuring means in the stack, the fuel gas in which the voltage value of the stack in which the abnormality is detected is less than the lower limit voltage threshold value smaller than the abnormal voltage threshold value and the fuel gas When at least one of the pressure value of the fuel gas is lower than the lower limit fuel gas pressure threshold value lower than the steady operation pressure value or when the supply of the fuel gas is stopped for a specified time, the supply of the fuel gas to the stack is resumed. A solid polymer fuel cell power generation system characterized by controlling the fuel gas inflow adjusting means. The polymer electrolyte fuel cell power generation system according to claim 16 or 17,
A fuel gas buffer tank is disposed between the fuel gas discharge port of each of the plurality of stacks and each of the fuel gas reverse inflow prevention means. .

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