JP2011054288A - 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 capable of making an installation space small by greatly reducing a volume of use of inert gas used at stoppage of power generation operation. <P>SOLUTION: The polymer electrolyte fuel cell power generation system 100 includes: a cylinder 161 having one end connected through a connection valve 169a between a fuel gas exhaust part of a stack 111 and a connection valve 129c, having a piston 162 arranged inside and having an opening part 161a fitted at the other end; a cylinder 171 having one end connected through a connection valve 179a between an oxidant gas exhaust part of the stack 111 and a connection valve 139c, having a piston 172 arranged inside and having an opening part 171a fitted at the other end; and a resistor 181, a changeover switch 182 or the like prompting self-consumption of hydrogen gas 2 and oxygen gas 3 remaining inside the stack 111. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

A schematic configuration of a conventional polymer electrolyte fuel cell power generation system is shown in FIG.
As shown in FIG. 7, the fuel gas supply section of the stack 11 in which a plurality of cells sandwiching a solid polymer membrane having proton conductivity between a gas permeable and conductive fuel electrode and an oxidation electrode are stacked is provided with a fuel gas. A hydrogen gas cylinder 21 for supplying the hydrogen gas 2 is connected via a pressure regulating valve 29a. A humidifier 22 for humidifying the hydrogen gas 2 is disposed between the pressure regulating valve 29a and the fuel gas supply unit of the stack 11. A connection valve 29b is interposed between the humidifier 22 and the fuel gas supply part of the stack 11.

  An oxygen gas cylinder 31 for supplying oxygen gas 3 as an oxidizing gas is connected to the oxidizing gas supply section of the stack 11 via a pressure regulating valve 39a. A humidifier 32 for humidifying the oxygen gas 3 is disposed between the pressure regulating valve 39a and the oxidizing gas supply unit of the stack 11. A connection valve 39b is interposed between the humidifier 32 and the oxidizing gas supply unit of the stack 11.

  A drain pot 23 is connected to the fuel gas discharge portion of the stack 11 via a connection valve 29c. A drain pot 33 is connected to the oxidizing gas discharge portion of the stack 11 via a connection valve 39c.

  A nitrogen gas cylinder 41 for feeding nitrogen gas 4 as an inert gas is connected between the fuel gas supply unit of the stack 11 and the connection valve 29b via a pressure regulating valve 49a. A humidifier 42 for humidifying the nitrogen gas 4 is disposed between the pressure regulating valve 49a and the fuel gas supply unit of the stack 11. A connection valve 49b is interposed between the humidifier 42 and the fuel gas supply unit of the stack 11.

  A nitrogen gas cylinder 51 is connected between the oxidizing gas supply part of the stack 11 and the connection valve 39b via a pressure regulating valve 59a. A humidifier 52 for humidifying the nitrogen gas 4 is disposed between the pressure regulating valve 59a and the oxidizing gas supply unit of the stack 11. A connection valve 59b is interposed between the humidifier 52 and the oxidizing gas supply unit of the stack 11.

Next, the operation of the conventional polymer electrolyte fuel cell power generation system 10 will be described.
When performing the power generation operation, the pressure regulating valve 29a is used to regulate the pressure, and the connection valves 29b and 29c are opened, so that the hydrogen gas 2 is sent from the hydrogen gas cylinder 21 and the water in the humidifier 22 is discharged. 1 is supplied to the fuel gas supply section of the stack 11 and is pressurized by the pressure regulating valve 39a to open the connection valves 39b and 39c. The oxygen gas 3 is sent out from the oxygen gas cylinder 31 and fed into the water 1 in the humidifier 32 and is humidified to a saturated state, and then supplied to the oxidizing gas supply unit of the stack 11. The hydrogen gas 2 and the oxygen gas 3 react electrochemically in the stack 11 to obtain electric power.

  The remaining hydrogen gas 2 that did not participate in the electrochemical reaction in the stack 11 is discharged from the fuel gas discharge portion of the stack 11 together with the excess water 1 and the like generated by the electrochemical reaction, and the drain pot 23 Then, the water 1 is removed and then reused. Further, the remaining oxygen gas 3 not involved in the electrochemical reaction in the stack 11 is discharged from the oxidizing gas discharge portion of the stack 11 together with the excess water 1 and the like generated by the electrochemical reaction, and the drain After the water 1 is removed in the pot 33, it is reused.

  When stopping the power generation operation, the valves 29a, 29b, 39a, 39b are closed, and the hydrogen gas 2 from the hydrogen gas cylinder 21 and the oxygen gas 3 from the oxygen gas cylinder 31 into the stack 11 are closed. After the supply of gas is stopped, the pressure regulating valves 49a and 59a are used to regulate the pressure, the connection valves 49b and 59b are opened, the nitrogen gas 4 is fed from the nitrogen gas cylinders 41 and 51, and the humidifiers 42, After being fed into the water 1 in the water 52 and humidified to a saturated state, the hydrogen gas 2 and the oxygen gas 3 remaining in the stack 11 are supplied to the fuel gas supply unit and the oxidizing gas supply unit of the stack 11. Is purged from the fuel gas discharge portion and the oxidizing gas discharge portion, and when the inside of the stack 11 is replaced with the nitrogen gas 4, the valves 29c, 39c, 49a, 49b, 59a, 59b are closed. By making the inside of the stack 11 an atmosphere of nitrogen gas 4 of saturated water vapor, the solid polymer accompanying an extra reaction with the remaining hydrogen gas 2 and oxygen gas 3 while preventing the solid polymer film of the cell from being dried Degradation of a catalyst or the like in the membrane or electrode is suppressed (for example, see Patent Document 1 below).

JP-A-6-251788

  In the conventional polymer electrolyte fuel cell power generation system 10 as described above, after stopping the power generation operation, the hydrogen gas 2 and the oxygen gas 3 remaining in the stack 11 are purged with the nitrogen gas 4, In order to replace the inside of the stack 11 with the nitrogen gas 4, when the power generation operation is stopped, a large amount of the nitrogen gas 4 is used (about 4 to 4 times the volume of the flow path system of the gas 2 and 3 of the stack 11). 5 times), when the start and stop of the power generation operation are repeated frequently over a long period of time, the amount of nitrogen gas 4 used becomes very large, the running cost becomes high, and a large number of nitrogen gas cylinders 41 and 51 are used. It is necessary to install or to increase the capacity of the nitrogen gas cylinders 41 and 51, which requires a large installation space.

  Accordingly, the present invention provides a polymer electrolyte fuel cell power generation system that can greatly reduce the amount of inert gas used when power generation operation is stopped to reduce the installation space. With the goal.

  The solid polymer fuel cell power generation system according to the first invention for solving the above-described problem is a plurality of cells in which a solid polymer film is sandwiched between a fuel electrode and an oxidation electrode and are supplied to the fuel electrode. A fuel gas supply unit and a discharge unit, and a stack having an oxidation gas supply unit and a discharge unit for supplying the fuel gas to the oxidation electrode, and the fuel gas supply unit connected to the fuel gas supply unit of the stack via a connection valve A fuel gas supply means for supplying gas, an oxidizing gas supply means for supplying the oxidizing gas connected to the oxidizing gas supply section of the stack via a connection valve, and a connection valve for the fuel gas supply section of the stack An inert gas supply means for a fuel electrode that is connected via a connection electrode and supplies an inert gas and is connected to the oxidation gas supply unit of the stack via a connection valve to supply an inert gas. A gas supply means, a fuel gas exhaust means connected to the fuel gas discharge section of the stack via a connection valve to exhaust the gas from the stack to the outside of the stack, and the oxidizing gas discharge of the stack An oxidant gas exhaust means for exhausting the oxidant gas from the stack to the outside of the stack, and a self-consumption means for self-consuming the fuel gas and the oxidant gas inside the stack. And at least one of between the fuel gas supply part of the stack and the connection valve of the fuel gas supply means and between the fuel gas discharge part of the stack and the connection valve of the fuel gas exhaust means A series having a piston connected to one end via a valve and having a piston disposed therein and pressing the piston toward the one end. Between the oxidizing gas supply unit of the stack and the connection valve of the oxidizing gas supply unit, and the connection of the oxidizing gas discharge unit and the oxidizing gas exhaust unit of the stack A cylinder having one end connected to at least one of the valves via a connecting valve and having a piston disposed therein and pressing the piston toward the one end is provided on the other end. And a compression means for oxidizing gas.

  The polymer electrolyte fuel cell power generation system according to a second aspect of the present invention is the first aspect, wherein the fuel electrode side pressure measuring means for measuring the pressure on the fuel electrode side of the stack and the oxidation electrode of the stack are measured. The connection valve of the gas supply means is closed so as to stop the supply of the fuel gas and the oxidizing gas to the stack based on the oxidation electrode side pressure measurement means for measuring the pressure on the side and the power generation operation stop signal And controlling the closing of the connection valve of the exhaust means so as to stop the exhaust of the gas from within the stack, and the self-consumption of the fuel gas and the oxidizing gas inside the stack. When the operation of the consuming means is controlled and the pressure on the fuel electrode side of the stack falls below the first fuel electrode side specified value based on the information from the fuel electrode side pressure measuring means, the And controlling the opening of the connection valve of the fuel electrode inert gas supply means so as to supply the inert gas to the stack, and based on the information from the oxidation electrode side pressure measuring means, the oxidation electrode of the stack. When the pressure on the side becomes equal to or lower than the first oxidation electrode side specified value, the fuel electrode is controlled after opening the connection valve of the inert gas supply means for the oxidation electrode so as to supply the inert gas to the stack. Based on the information from the side pressure measuring means, when the pressure on the fuel electrode side of the stack becomes equal to or higher than a second fuel electrode side specified value, the supply of the inert gas to the stack is stopped. The connection valve of the electrode inert gas supply means is controlled to be closed, and the pressure on the oxidation electrode side of the stack is greater than or equal to a second oxidation electrode side specified value based on information from the oxidation electrode side pressure measurement means. Then Characterized in that a control means for closing controlling the connection valve of the oxidizing electrode inert gas supply means so as to stop the supply of the inert gas to the stack.

  In the polymer electrolyte fuel cell power generation system according to a third aspect, in the second aspect, the control means supplies the fuel gas and the oxidizing gas to the stack based on a power generation operation start signal. The connection valve of the fuel gas compression means is controlled to open, and the connection valve of the fuel gas compression means is controlled to open so that the fuel gas flows into one end of the cylinder of the fuel gas compression means. At the same time, the connection valve of the oxidant gas compression unit is controlled to open so that the oxidant gas flows into one end of the oxidant gas compression unit in the cylinder, and the information from the fuel electrode side pressure measurement unit is controlled. When the pressure on the fuel electrode side of the stack becomes equal to or lower than the first fuel electrode side specified value, the connection valve of the fuel gas compression means is closed and the oxidation is performed. Based on the information from the side pressure measuring means, when the pressure on the oxidation electrode side of the stack falls below the first oxidation electrode side specified value, the connection valve of the oxidation gas compression means is controlled to be closed. It is characterized by being.

  The polymer electrolyte fuel cell power generation system according to a fourth aspect of the present invention is the solid polymer fuel cell power generation system according to any one of the first to third aspects, wherein the pressing of at least one of the fuel gas compression means and the oxidizing gas compression means. The means is an opening for opening the inside of the other end of the cylinder to the atmosphere.

  A polymer electrolyte fuel cell power generation system according to a fifth aspect of the present invention is the solid polymer fuel cell power generation system according to any one of the first to third aspects, wherein the pressing of at least one of the fuel gas compression means and the oxidizing gas compression means The means is a pressing inert gas supply means for pressurizing and supplying an inert gas to the other end of the cylinder.

  A polymer electrolyte fuel cell power generation system according to a sixth aspect of the present invention is the solid polymer fuel cell power generation system according to any one of the first to third aspects, wherein the pressing of at least one of the fuel gas compression means and the oxidizing gas compression means The means is a water storage tank connected to the other end of the cylinder and storing water therein.

  A polymer electrolyte fuel cell power generation system according to a seventh aspect of the present invention is the solid polymer fuel cell power generation system according to any one of the first to third aspects, wherein the pressing means of the fuel gas compression means is on the other end side of the cylinder. It is a pressing fuel gas supply means for supplying fuel gas under pressure.

  The polymer electrolyte fuel cell power generation system according to an eighth aspect of the present invention is the solid polymer fuel cell power generation system according to any one of the first to third aspects, wherein the pressing means of the oxidizing gas compression means is on the other end side of the cylinder. It is a pressing oxidizing gas supply means for supplying an oxidizing gas under pressure.

  The polymer electrolyte fuel cell power generation system according to a ninth aspect of the present invention is the solid polymer fuel cell power generation system according to any one of the first to eighth aspects, wherein the pressing of at least one of the fuel gas compression means and the oxidizing gas compression means The means includes an urging member provided inside the other end side of the cylinder and urging the piston toward one end side of the cylinder.

  A 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 any one of the first to ninth aspects, wherein the connection valve of the fuel gas supply means and the inert gas supply means for the fuel electrode The volume of the flow path of the fuel gas surrounded by the connection valve of the fuel gas exhaust means and the cylinder of the fuel gas compression means is the same as that of the oxidation gas supply means. More than twice the volume of the flow path of the oxidizing gas surrounded by the connecting valve of the electrode inert gas supply means, the connecting valve of the oxidizing gas exhaust means, and the cylinder of the compressing means for oxidizing gas. It is characterized by being.

  A polymer electrolyte fuel cell power generation system according to a tenth aspect of the invention is the solid polymer fuel cell power generation system according to any one of the first to tenth aspects of the invention, wherein the piston has a cross-sectional area in the radial direction of the piston of the fuel gas compression means. The gas compression means has the same sectional area in the radial direction of the piston.

  According to the polymer electrolyte fuel cell power generation system according to the present invention, after stopping the power generation operation, the connection valve of the gas supply means is closed, so that the inside of the stack is sealed off from the outside, The remaining hydrogen gas and oxygen gas are self-consumed by the self-consuming means, that is, the hydrogen gas and oxygen gas remaining in the stack are consumed by chemical reaction in the stack, and the hydrogen gas and oxygen gas are consumed from within the stack. After the removal, the inert gas can be fed into the stack and the inside of the stack can be replaced with the inert gas, so that the amount of the inert gas supplied into the stack can be greatly reduced compared to the conventional case. Even when starting and stopping power generation operation are repeated frequently over a long period of time, the amount of inert gas used can be greatly reduced. It is possible to reduce Ngukosuto, the inert gas supply means can be installed in a space-saving.

1 is a schematic configuration diagram of a first embodiment of a polymer electrolyte fuel cell power generation system according to the present invention. It is a schematic block diagram of 2nd embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram 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 4th 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 5th 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 6th embodiment of the polymer electrolyte fuel cell power generation system which concerns on this invention. It is a schematic block diagram of an example of the conventional polymer electrolyte fuel cell power generation system.

  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.

  As shown in FIG. 1, a fuel gas supply section of a stack 111 in which a plurality of cells each having a proton conductive solid polymer membrane sandwiched between a gas permeable and conductive fuel electrode and an oxidation electrode is stacked is provided with a fuel gas. A hydrogen gas cylinder 121 for supplying hydrogen gas 2 is connected via a pressure regulating valve 129a. A humidifier 122 that humidifies the hydrogen gas 2 is disposed between the pressure regulating valve 129 a and the fuel gas supply unit of the stack 111. A connection valve 129 b is interposed between the humidifier 122 and the fuel gas supply unit of the stack 111.

  An oxygen gas cylinder 131 for supplying oxygen gas 3 as an oxidizing gas is connected to the oxidizing gas supply part of the stack 111 via a pressure regulating valve 139a. A humidifier 132 for humidifying the oxygen gas 3 is disposed between the pressure regulating valve 139a and the oxidizing gas supply unit of the stack 111. A connection valve 139b is interposed between the humidifier 132 and the oxidizing gas supply unit of the stack 111.

  A drain pot 123 is connected to the fuel gas discharge portion of the stack 111 via a connection valve 129c. A drain pot 133 is connected to the oxidizing gas discharge portion of the stack 111 via a connection valve 139c.

  A nitrogen gas cylinder 141 for supplying nitrogen gas 4 as an inert gas is connected between the fuel gas supply unit of the stack 111 and the connection valve 129b via a pressure regulating valve 149a and a connection valve 149b. . A nitrogen gas cylinder 151 is connected between the oxidizing gas supply part of the stack 111 and the connection valve 139b via a pressure regulating valve 159a and a connection valve 159b.

  One end of a cylindrical cylinder 161 is connected via a connection valve 169a between the fuel gas discharge part of the stack 111 and the connection valve 129c. Inside the cylinder 161, a piston 162 is provided which is slidable along the axial direction in the cylinder 161. On the other end side of the cylinder 161, an opening 161a opened to the atmosphere as a pressing means is provided.

  One end side of a cylindrical cylinder 171 is connected via a connection valve 179a between the oxidizing gas discharge part of the stack 111 and the connection valve 139c. Inside the cylinder 171, a piston 172 is provided which is slidably movable along the axial direction in the cylinder 171. On the other end side of the cylinder 171, an opening 171a that is opened to the atmosphere as a pressing means is provided.

  The volume of the flow path of the hydrogen gas 2 surrounded by the connection valves 129b, 129c and 149b and the cylinder 161 (hereinafter referred to as “stack hydrogen (fuel) gas system”) is connected to the connection valves 139b and 139c. , 159 b and the cylinder 171, the cylinder 161 is configured so as to be at least twice the volume of the flow path of the oxygen gas 3 (hereinafter abbreviated as “stack oxygen (oxidation) gas system”). Compared to 171, the volume is large (the cross-sectional area in the axial direction is large), although the cross-sectional area at the inner diameter in the radial direction is the same.

  Various external loads L and a self-consuming resistor 181 are electrically connected to the stack 111 via a changeover switch 182, and the changeover switch 182 includes the external load L and the resistance for the stack 111. The electrical connection with 181 can be switched.

  A pressure gauge 192a, which is a fuel electrode side pressure measuring means, is disposed between the fuel gas supply section of the stack 111 and the connection valves 129b and 149b. Between the oxidizing gas supply part of the stack 111 and the connection valves 139b and 159b, a pressure gauge 192b which is an oxidation electrode side pressure measuring means is disposed. These pressure gauges 192a and 192b are electrically connected to the input unit of the control device 191 which is a control means.

  The output unit of the control device 191 is electrically connected to the valves 1129a to 129c, 139a to 139c, 149a, 149b, 159a, 159b, 169a, 179a and the changeover switch 182, and the control device 191 Based on the information from the pressure gauges 192a and 192b, the opening and closing operations of the valves 129a to 129c, 139a to 139c, 149a, 149b, 159a, 159b, 169a and 179a and the switching operation of the changeover switch 182 are controlled. (Details will be described later).

  In the present embodiment, the hydrogen gas cylinder 121, the humidifier 122, the pressure regulating valve 129a, the connection valve 129b, and the like constitute a fuel gas supply means according to the present invention, and the oxygen gas cylinder 131, the humidifier The oxidant gas supply means according to the present invention is constituted by the vessel 132, the pressure regulating valve 139a, the connection valve 139b, and the like, and the fuel gas exhaust means according to the invention is constituted by the drain pot 123, the connection valve 129c and the like. The drain pot 133, the connection valve 139c, etc. constitute an oxidizing gas exhaust means according to the present invention, and the nitrogen gas cylinder 141, the pressure regulating valve 149a, the connection valve 149b, etc. constitute the fuel electrode according to the present invention. The inert gas supply means is used, and the nitrogen gas cylinder 151, the pressure regulating valve 159a, the connection valve 159b, etc. The inert gas supply means for the oxidation electrode according to the invention is configured, and the cylinder 161, the piston 162, the connection valve 169a and the like constitute the fuel gas compression means according to the present invention, and the cylinder 171 and the piston 172 The connecting valve 179a or the like constitutes the oxidizing gas compression means according to the present invention, and the resistor 181 and the changeover switch 182 or the like constitutes the self-consuming means according to the present invention.

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

  When a signal to start the power generation operation is input to the control device 191, the control device 191 controls the changeover switch 182 to connect the stack 111 to the external load L, and the pressure gauge 192a. , 192b based on the information from the pressure regulating valves 129a, 139a so as to supply the hydrogen gas 2 and the oxygen gas 3 into the stack 111 at a specified operating pressure (for example, about 100 to 600 kPa (abs)). And the connection valves 129b, 129c, 139b, 139c, 169a and 179a are controlled to be opened.

  Thereby, the hydrogen gas 2 sent out from the hydrogen gas cylinder 121 is supplied into the water 1 in the humidifier 122 and is humidified to a saturated state, and is supplied to the fuel gas supply unit of the stack 111. The oxygen gas 3 sent out from the oxygen gas cylinder 131 is supplied into the water 1 in the humidifier 132 and is humidified to a saturated state, and is supplied to the oxidizing gas supply unit of the stack 111, so that the hydrogen gas 2 And the oxygen gas 3 react electrochemically in the stack 111, and power can be supplied from the stack 111 to the external load L.

  Then, the remaining hydrogen gas 2 that did not participate in the electrochemical reaction in the stack 111 is discharged from the fuel gas discharge section of the stack 111 together with the excess water 1 and the like generated by the electrochemical reaction, and the drain After the water 1 is removed in the pot 123, it is reused. Further, the remaining oxygen gas 3 that did not participate in the electrochemical reaction in the stack 111 is discharged from the oxidizing gas discharge section of the stack 111 together with the excess water 1 and the like generated by the electrochemical reaction, and the drain After the water 1 is removed in the pot 133, it is reused.

  At this time, the pistons 162 and 172 in the cylinders 161 and 171 are positioned on the other end side in the cylinders 161 and 171 by the gas 2 and 3 flowing into the cylinders 161 and 171 from one end side. To come.

  When a power generation operation stop signal is input to the control device 191 during the power generation operation in this way, the control device 191 closes the valves 129a to 129c and 139a to 139c. In this manner, the supply of the hydrogen gas 2 from the hydrogen gas cylinder 121 and the oxygen gas 3 from the oxygen gas cylinder 131 into the stack 111 is stopped, and the gases 2 and 3 from the stack 111 are stopped. By stopping the exhaust, the gas systems 2 and 3 of the stack 111 are shut off from the outside, and the changeover switch 182 is controlled to connect the stack 111 to the resistor 181.

  As a result, the gases 2 and 3 remaining in the gas 2 and 3 system of the stack 111 are reduced by self-consumption due to power consumption by the resistor 181, that is, consumed by a chemical reaction in the stack 111. Go. When the pressure of the gas 2, 3 system of the stack 111 becomes atmospheric pressure (about 100 kPa (abs)) with the self-consumption (decrease) of the gas 2, 3, the cylinders 161, 171 The pistons 162 and 172 start to be pressed from the other end side of the cylinders 161 and 171 toward the one end side by the atmospheric pressure, and the gases 2 and 3 remaining in the system are compressed by the compression force (atmospheric pressure) of the pistons 162 and 172. ) Is forcibly sent to the cell of the stack 111 and consumed quickly.

  Then, almost all (99% or more) of the hydrogen gas 2 remaining in the fuel gas system of the stack 111 is consumed, and the pressure on the fuel electrode side in the stack 111 is set to a first fuel electrode side specified value (for example, When the saturated water vapor pressure (about 1 to 50 kPa (abs)) at the temperature of the stack 111 (about 10 to 80 ° C.) is reached, the control device 191 determines the connection valve 169a based on the information from the pressure gauge 192a. Then, the pressure control valve 149a is pressure-controlled so that the nitrogen gas 4 is supplied into the fuel gas system of the stack 111, and the connection valve 149b is controlled to open.

  Similarly, almost all (99% or more) of the oxygen gas 3 remaining in the oxidizing gas system of the stack 111 is consumed, and the pressure on the oxidizing electrode side in the stack 111 becomes the first oxidizing electrode side specified value. (For example, when the saturated water vapor pressure (about 1 to 50 kPa (abs)) at the temperature of the stack 111 (about 10 to 80 ° C.) is reached), the control device 191 determines that the pressure gauge 192b is based on the information. After controlling to close the connection valve 179a, the pressure control valve 159a is pressure-controlled and the connection valve 159b is opened to supply nitrogen gas 4 into the oxidizing gas system of the stack 111. .

  Subsequently, when the pressure on the fuel electrode side of the stack 111 reaches a second fuel electrode side specified value (for example, about 100 to 150 kPa (abs)) by the nitrogen gas 4, the control device 191 causes the pressure gauge Based on the information from 192a, the valves 149a and 149b are controlled to be closed, and the fuel gas system (excluding the cylinder 161) of the stack 111 is replaced with nitrogen gas 4 (to create a nitrogen gas atmosphere).

  Similarly, when the pressure on the oxidation electrode side of the stack 111 reaches a second oxidation electrode side specified value (for example, about 100 to 150 kPa (abs)) by the nitrogen gas 4, the control device 191 Based on the information from the pressure gauge 192b, the valves 159a and 159b are controlled to be closed, and the oxidizing gas system (excluding the inside of the cylinder 171) of the stack 111 is replaced with nitrogen gas 4 (to make a nitrogen gas atmosphere).

  That is, conventionally, after the power generation operation is stopped, the nitrogen gas 4 is supplied into the stack 11 and the hydrogen gas 2 and the oxygen gas 3 remaining in the stack 11 are purged to the outside. At the same time as the gas 2 and 3 are removed, the inside of the stack 11 is replaced with the nitrogen gas 4. However, in this embodiment, after the power generation operation is stopped, the gas 2 and 3 system of the stack 111 is shut off from the outside. The hydrogen gas 2 and oxygen gas 3 remaining in the stack 111 are self-consumed, that is, the hydrogen gas 2 and oxygen gas 3 remaining in the stack 111 are chemically reacted in the stack and consumed. After removing the gas 2 and 3 from the gas 2 and 3 system of the stack 111, the nitrogen gas 4 is fed into the stack 111 to The inside click 111 is had to be replaced with nitrogen gas 4.

  For this reason, in the present embodiment, the amount of nitrogen gas 4 supplied into the stack 111 can be significantly reduced compared to the prior art (1 to 1 of the volume of the flow path system of the gases 2 and 3 of the stack 111). Therefore, even if the start and stop of the power generation operation are repeated frequently over a long period of time, the amount of nitrogen gas 4 used can be greatly reduced, and the running cost can be reduced. In addition, the nitrogen gas cylinders 141 and 151 can be installed in a space-saving manner.

  Therefore, according to the present embodiment, the amount of nitrogen gas 4 used when the power generation operation is stopped can be greatly reduced, and the installation space can be reduced.

  Further, it is not necessary to circulate the nitrogen gas 4 in the stack 111 and purge the hydrogen gas 2 and the oxygen gas 3, and the supply amount of the nitrogen gas 4 into the stack 111 can be suppressed to the minimum necessary amount. Even if the nitrogen gas 4 supplied into the stack 111 is not humidified, the solid polymer film of the cells of the stack 111 is not dried and deteriorated. For this reason, since the humidifiers 43 and 53 for the nitrogen gas 4 as in the past can be omitted, the installation space can be further reduced in size.

  Further, the gas 2 and 3 remaining in the gas system of the stack 111 are pressed by the pistons 162 and 172 in the cylinders 161 and 171 by atmospheric pressure, and are forcibly sent to the cells of the stack 111. Therefore, the gas 2 and 3 remaining in the system can be quickly self-consumed, and the gas 2 and 3 can be efficiently removed from the system. Compared with the case where the gas 2 or 3 remaining in the system is forced to flow in the system by a blower or the like and self-consumed, the power required for self-consumption can be made unnecessary, and the power consumption of the entire system can be reduced. Since it can be reduced, the efficiency of the entire system can be increased.

The volume of the cylinder 161 (in the axial direction) is set so that the volume of the stack 111 in the fuel gas (H ₂ ) system is at least twice the volume of the stack 111 in the oxidizing gas (O ₂ ) system. Since the cross-sectional area) is larger than the volume of the cylinder 171 (the cross-sectional area in the axial direction), the inside of the oxidizing gas system due to the electrochemical reaction (2H ₂ + O ₂ → 2H ₂ O) in the stack 111 Oxygen gas 3 can be removed more reliably (99% or more), so there is a malfunction at the time of power generation operation start-up due to oxygen gas 3 remaining in the oxidizing gas system (a high potential spot is locally generated in the cell) Thus, the possibility of causing electric corrosion in the catalyst) can be prevented.

  Further, the cylinder 161 and the cylinder 171 have the same cross-sectional area at the inner diameter in the radial direction, that is, the cross-sectional areas at the outer diameter in the radial direction of the piston 162 and the piston 172 are the same. The pressure applied from the piston 162 into the fuel gas system of the stack 111 and the pressure applied from the piston 172 into the oxidizing gas system of the stack 111 can be made equal when consumed. The pressure load applied to the cell can be made uniform, and damage to the cell can be greatly suppressed.

[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, for the same parts as those in the above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, thereby omitting the description overlapping with the description in the above-described embodiment.

  As shown in FIG. 2, the opening 161a of the cylinder 161 is connected between the pressure regulating valve 149a and the connection valve 149b of the nitrogen gas cylinder 141 via an on-off valve 269b. A three-way switching valve 269c is interposed between the opening 161a of the cylinder 161 and the opening / closing valve 269b, and the switching valve 269c is configured so that one port can communicate with the outside. .

  The opening 171a of the cylinder 171 is connected between the pressure regulating valve 159a and the connection valve 159b of the nitrogen gas cylinder 151 via an on-off valve 279b. A three-way switching valve 279c is interposed between the opening 171a of the cylinder 171 and the opening / closing valve 279b, and the switching valve 279c is configured so that one port can communicate with the outside. .

  The valves 269b, 269c, 279b, and 279c are electrically connected to the output unit of the control device 191, respectively. The control device 191 is based on information from the pressure gauges 192a and 192b. Further, the opening / closing operation of the valves 269b and 279b and the switching operation of the valves 269c and 279c can be controlled (details will be described later).

  In this embodiment, the nitrogen gas cylinder 121, the pressure regulating valve 129a, the on-off valve 269b, the switching valve 269c, and the like are used to press the fuel gas compression means according to the present invention (pressing inert gas supply). And the pressure adjusting valve 139a, the on-off valve 279b, the switching valve 279c and the like, and the pressing means of the oxidizing gas compression means (pressing inert gas supply means) according to the present invention. Is configured.

  In such a polymer electrolyte fuel cell power generation system 200 according to the present embodiment, when a signal indicating that power generation operation is started is input to the control device 191, the control device 191 performs the first operation described above. The same control as in the case of the polymer electrolyte fuel cell power generation system 100 according to the embodiment is performed to supply power from the stack 111 to the external load L.

  When a signal to stop the power generation operation is input to the control device 191, the control device 191 is the same as in the case of the polymer electrolyte fuel cell power generation system 100 according to the first embodiment described above. Further, the valves 129a to 129c and 139a to 139c are controlled to be closed to stop the supply of the hydrogen gas 2 from the hydrogen gas cylinder 121 and the oxygen gas 3 from the oxygen gas cylinder 131 into the stack 111. At the same time, by stopping the exhaust of the gases 2 and 3 from the stack 111, the flow path system of the gases 2 and 3 in the stack 111 is shut off from the outside, and the stack 111 is connected to the resistor 181. The changeover switch 182 is controlled to be connected.

  In addition, the control device 191 performs pressure control of the pressure control valves 149a and 159a and control of opening of the on-off valves 269b and 279b, and connects the nitrogen gas cylinders 141 and 151 and the cylinders 161 and 171. By switching the switching valves 269c and 279c so as to communicate with each other, the nitrogen gas 4 in the nitrogen gas cylinders 141 and 151 is pressurized and supplied to the other end side in the cylinders 161 and 171 (for example, about 100 to 600 kPa). (Abs)).

  As a result, the pistons 162 and 172 in the cylinders 161 and 171 are pressed from the other end side of the cylinders 161 and 171 toward the one end side by the pressure of the nitrogen gas 4, and the gas 2 and 3 in the stack 111. The gases 2 and 3 remaining in the system are forcibly sent to the cells of the stack 111 by the compressive force of the pistons 162 and 172 (supply pressure of the nitrogen gas 4) and consumed more rapidly.

  In this way, almost all (99% or more) of the hydrogen gas 2 remaining in the fuel gas system of the stack 111 is consumed, and the pressure on the fuel electrode side in the stack 111 becomes the first fuel electrode side specified value ( For example, when the saturated water vapor pressure (about 1 to 50 kPa (abs)) at the temperature of the stack 111 (about 10 to 80 ° C.) is reached, the control device 191 determines the connection based on the information from the pressure gauge 192a. The valve 169a and the on-off valve 269b are controlled to be closed, and the switching valve 269c is controlled to switch between the other end side in the cylinder 161 and the outside so that the one end side in the cylinder 161 is depressurized. Then, the nitrogen gas 4 on one end side in the cylinder 161 is exhausted to the outside.

  Similarly, almost all (99% or more) of the oxygen gas 3 remaining in the oxidizing gas system of the stack 111 is consumed, and the pressure on the oxidizing electrode side in the stack 111 becomes the first oxidizing electrode side specified value. (For example, when the saturated water vapor pressure (about 1 to 50 kPa (abs)) at the temperature of the stack 111 (about 10 to 80 ° C.) is reached), the control device 191 determines that the control device 191 is based on the information from the pressure gauge 192b. The connection valve 179a and the on-off valve 279b are controlled to be closed, and the switching valve 279c is controlled to switch between the other end side in the cylinder 171 and the outside, and the one end side in the cylinder 171 is depressurized. Thus, the nitrogen gas 4 on one end side in the cylinder 171 is exhausted to the outside.

  The pressure control valves 149a and 159a are pressure-controlled so that the nitrogen gas 4 is supplied into the gas systems 2 and 3 of the stack 111, and the connection valves 149b and 159b are controlled to be opened. When the pressure on the fuel electrode side and the oxidation electrode side of 111 reaches the second specified value (for example, about 100 to 150 kPa (abs)) by the nitrogen gas 4, the control device 191 performs the first operation described above. As in the case of the embodiment, the valves 149a, 149b, 159a, 159b are controlled to be closed based on information from the pressure gauges 192a, 192b, and the gas 2, 3 system (the cylinder 161) of the stack 111 is controlled. , 171) is replaced with nitrogen gas 4 (nitrogen gas atmosphere).

  That is, in the polymer electrolyte fuel cell power generation system 100 according to the first embodiment described above, the pistons 162 and 172 are pressed at atmospheric pressure by opening one end side of the cylinders 161 and 171 to the atmosphere. However, in the polymer electrolyte fuel cell power generation system 200 according to the present embodiment, the pistons 162 and 172 are made large by pressurizing and supplying the nitrogen gas 4 to the other end side in the cylinders 161 and 171. It was made to press above atmospheric pressure.

  For this reason, in this embodiment, the gas 2 and 3 remaining in the gas 2 and 3 system of the stack 111 are further transferred to the cell of the stack 111 than in the case of the first embodiment described above. It can be forcibly sent and consumed more quickly.

  Therefore, according to this embodiment, it is possible to obtain the same effect as in the case of the first embodiment described above, but also when the operating pressure of the stack 111 is relatively higher than the atmospheric pressure ( Even in the case of about 110 to 600 kPa (abs)), the removal of the gases 2 and 3 from the gas 2 and 3 system of the stack 111 is more efficient than in the first embodiment described above. It can be carried out.

[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 above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, thereby omitting the description overlapping with the description in the above-described embodiment.

  As shown in FIG. 3, the stack 111 and the cylinders 171 and 181 are disposed inside a shield box 383 that shields the outside from the inside. The shield box 383 is filled with nitrogen gas 4 under atmospheric pressure (about 110 to 600 kPa (abs)).

  In this embodiment, the shield box 383 and the like are configured so as to serve also as the pressing means (pressing inert gas supply means) of the fuel gas compressing means and the oxidizing gas compressing means according to the present invention. Yes.

  That is, in the polymer electrolyte fuel cell power generation system 200 according to the second embodiment described above, the nitrogen gas 4 in the nitrogen gas cylinders 141 and 151 is supplied to the valve in the other end side in the cylinders 161 and 171. 149a, 269b, 269c, 159a, 279b, and 279c are supplied and discharged. However, in the polymer electrolyte fuel cell power generation system 300 according to this embodiment, the pistons 162 and 172 in the cylinders 161 and 171 are used. Is pressurized with nitrogen gas 4 filled in the shield box 383 under pressure.

  Therefore, in the second embodiment described above, the valves 149a, 269b, 269c, 159a, 279b, and 279c are controlled to supply and discharge the nitrogen gas 4 with respect to the other end side in the cylinders 171 and 181. Although necessary, in this embodiment, a valve or the like only for supplying and discharging the nitrogen gas 4 with respect to the other end side in the cylinders 171 and 181 can be eliminated.

  Therefore, according to the present embodiment, it is possible to obtain the same effect as that of the first and second embodiments described above, as well as the control of the second embodiment described above. The system can be simplified and the system cost can be reduced.

[Fourth embodiment]
A fourth 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 above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, thereby omitting the description overlapping with the description in the above-described embodiment.

  As shown in FIG. 4, a hydrogen gas tank 464 filled with hydrogen gas 2 under pressure is connected to the opening 161 a of the cylinder 161. Further, an oxygen gas tank 474 filled with oxygen gas 3 under pressure is connected to the opening 171 a of the cylinder 171.

  In such an embodiment, the hydrogen gas tank 464 or the like constitutes the pressing means (pressing fuel gas supply means) of the fuel gas compression means according to the present invention, and the oxygen gas tank 474 or the like constitutes the present invention. The pressing means (pressing oxidizing gas supply means) of the oxidizing gas compression means is configured.

  That is, in the polymer electrolyte fuel cell power generation system 100 according to the first embodiment described above, the pistons 162, 172 in the cylinders 161, 171 are pressed with air, and the second, third described above. In the polymer electrolyte fuel cell power generation systems 200 and 300 according to the embodiment, the pistons 162 and 172 in the cylinders 161 and 171 are pressed with the nitrogen gas 4, but the solid polymer according to the embodiment is used. In the fuel cell power generation system 400, the piston 162 in the cylinder 161 communicating with the fuel electrode side of the cell of the stack 111 is pressed with the hydrogen gas 2 and also communicated with the oxidation electrode side of the cell of the stack 111. The piston 172 in the cylinder 171 is pressed with the oxygen gas 3.

  For this reason, in this embodiment, the sealing performance between the cylinders 161 and 171 and the pistons 162 and 172 is lowered, and by any chance gas leaks from the other end side in the cylinders 161 and 171 to one end side. Even if it occurs, there is no problem in the electrochemical reaction in the stack 111.

  Therefore, according to the present embodiment, it is possible to obtain the same effect as that of the first to third embodiments described above, as well as the case of the first to third embodiments described above. The electrochemical reaction in the stack 111 can be more reliably performed.

[Fifth embodiment]
A fifth 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 above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, thereby omitting the description overlapping with the description in the above-described embodiment.

  As shown in FIG. 5, water 1 is stored in the openings 161 a and 171 a of the cylinders 161 and 171 whose axial directions are vertically directed so that the openings 161 a and 171 a are positioned upward. At the same time, the lower portions of the water storage tanks 565 and 575 which are open to the atmosphere are connected, and the upper side of the pistons 162 and 172 in the cylinders 161 and 171 is filled with the water 1.

  In this embodiment, the water tank 565 or the like constitutes the pressing means of the fuel gas compression means according to the present invention, and the water tank 575 or the like presses the oxidizing gas compression means according to the present invention. Means.

  That is, in the polymer electrolyte fuel cell power generation systems 100, 200, 300, 400 according to the first to fourth embodiments described above, the pistons 162, 172 in the cylinders 161, 171 are made air, gas 2, In the polymer electrolyte fuel cell power generation system 500 according to this embodiment, the pistons 162 and 172 in the cylinders 161 and 171 are pressed by their own weight. It is.

  Therefore, according to the present embodiment, the same effects as those of the first to fourth embodiments described above can be obtained.

[Sixth embodiment]
A sixth 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 above-described embodiment, the same reference numerals as those used in the description of the above-described embodiment are used, thereby omitting the description overlapping with the description in the above-described embodiment.

  As shown in FIG. 6, compression coil springs 666 and 676 are disposed on the other end side of the pistons 162 and 172 in the cylinders 161 and 171.

  In such an embodiment, the compression coil spring 666 or the like constitutes the pressing means (biasing member) of the fuel gas compression means according to the present invention, and the compression coil spring 676 or the like relates to the present invention. It constitutes a pressing means (biasing member) of the oxidizing gas compression means.

  That is, in the polymer electrolyte fuel cell power generation systems 100, 200, 300, 400, and 500 according to the first to fifth embodiments described above, the pistons 162 and 172 in the cylinders 161 and 171 are air or gas. In the polymer electrolyte fuel cell power generation system 600 according to this embodiment, the pistons 162 and 172 in the cylinders 161 and 171 are connected to the compression coil springs 666. It was made to press at 676.

  Therefore, according to the present embodiment, the same effects as those of the first to fifth embodiments described above can be obtained.

[Other Embodiments]
In the fifth embodiment described above, the individual water storage tanks 565 and 575 are connected to the cylinders 161 and 171 respectively. However, as another embodiment, for example, the cylinders 161 and 171 are connected. By connecting to the same water tank, it is also possible to serve as both the pressing means of the fuel gas compression means and the pressing means of the oxidation gas compression means.

  In the above-described embodiment, the cylinders 161 and 171 are connected via the connection valves 169a and 169b between the gas discharge part of the stack 111 and the connection valves 129c and 139c. The cylinders 161 and 171 are connected to the downstream side position of the gas flow direction of 111, but as another embodiment, for example, the gas supply unit of the stack 111 and the connection valves 129b, 139b, 149b, and 159b It is also possible to connect the cylinders 161 and 171 via the connection valves 169a and 169b, that is, to connect the cylinders 161 and 171 to the upstream side position of the stack 111 in the gas flow direction.

  In the embodiment described above, the self-consumption means for self-consuming the gas 2 and 3 remaining in the stack 111 by electrically connecting the resistor 181 to the stack 111 via the changeover switch 182 is provided. In another embodiment, for example, the current remaining in the stack 111 is applied by a current applying unit that applies a current to the stack 111, a voltage applying unit that applies a voltage to the stack 111, or the like. It is also possible to constitute a self-consuming means for self-consuming the gases 2 and 3.

  Further, in the above-described embodiment, the nitrogen gas 4 supplied to the fuel gas system and the oxidizing gas system of the stack 111 is used by using different nitrogen gas cylinders 141 and 151, but as another embodiment, For example, the nitrogen gas 4 supplied to the fuel gas system and the oxidizing gas system of the stack 111 can be supplied from the same nitrogen gas cylinder.

  In the above-described embodiment, the gas 2 and 3 are supplied from the gas cylinders 121 and 131 filled with the gas 2 and 3. However, as another embodiment, for example, the gas 2 and 3 are used. It is also possible to generate the gas 2 and 3 with a generator that generates the gas and feed it.

  In the above-described embodiment, the case where the nitrogen gas 4 is applied as the inert gas has been described. However, the present invention is not limited to this, and other inert gas such as helium gas or argon gas is applied. It is also possible. However, it is most preferable to apply the nitrogen gas 4 as the inert gas because the cost can be reduced most.

  In the above-described embodiment, the case where the hydrogen gas 2 is applied as the fuel gas has been described. However, the present invention is not limited to this, and for example, the hydrogen gas is reformed by reforming hydrocarbons such as natural gas or kerosene. Any fuel gas containing hydrogen gas, such as those contained, can be applied in the same manner as in the above-described embodiment. However, as in the above-described embodiment, it is very preferable that the fuel gas is hydrogen gas 2 because the effects of the present invention can be obtained most significantly.

  In the embodiment described above, the case where the oxygen gas 3 is applied as the oxidizing gas has been described. However, the present invention is not limited to this, and for example, an oxidizing gas containing oxygen gas such as air may be used. It can be applied in the same manner as in the above-described embodiment. However, as in the above-described embodiment, it is very preferable that the oxidizing gas is the oxygen gas 3 because the effect of the present invention can be obtained most significantly.

  Further, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be applied in appropriate combination as necessary.

  The polymer electrolyte fuel cell power generation system according to the present invention can greatly reduce the amount of inert gas used, reduce running costs, and install inert gas supply means in a space-saving manner. Therefore, it can be used extremely beneficially in the industry.

L External load 1 Water 2 Hydrogen gas 3 Oxygen gas 4 Nitrogen gas 100 Polymer electrolyte fuel cell power generation system 111 Stack 121 Hydrogen gas cylinder 122 Humidifier 123 Drain pot 129a Pressure regulating valve 129b, 129c Connection valve 131 Oxygen gas cylinder 132 Humidifier 133 Drain pot 139a Pressure regulating valve 139b, 139c Connection valve 141, 151 Nitrogen gas cylinder 149a, 159a Pressure regulating valve 149b, 159b Connection valve 161, 171 Cylinder 161a, 171a Opening 162, 172 Piston 169a, 179a Connection valve 181 Resistance 182 Switch 182 191 Controller 192a, 192b Pressure gauge 200 Polymer electrolyte fuel cell power generation system 269b, 279b On-off valve 269c, 279c Switching valve 300 Polymer electrolyte fuel cell power generation system Temu 383 shielding box 400 polymer electrolyte fuel cell power generation system 464 the hydrogen gas tank 474 oxygen gas tank 500 polymer electrolyte fuel cell power generation system 565,575 reservoir 600 polymer electrolyte fuel cell power generation system 666,676 compression coil spring

Claims (11)

A plurality of cells having a solid polymer membrane sandwiched between a fuel electrode and an oxidation electrode are stacked and have a fuel gas supply unit and a discharge unit for supplying the cell to the fuel electrode, and an oxidation gas supply unit and a discharge unit for supplying to the oxidation electrode A stack having
A fuel gas supply means connected to the fuel gas supply section of the stack via a connection valve to supply the fuel gas;
An oxidizing gas supply means connected to the oxidizing gas supply section of the stack via a connection valve to supply the oxidizing gas;
An inert gas supply means for a fuel electrode connected to the fuel gas supply section of the stack via a connection valve to supply an inert gas;
An inert gas supply means for an oxidizing electrode connected to the oxidizing gas supply section of the stack via a connection valve to supply an inert gas;
A fuel gas exhaust means connected to the fuel gas discharge portion of the stack via a connection valve to exhaust the gas from the stack to the outside of the stack;
An oxidizing gas exhaust means connected to the oxidizing gas discharge portion of the stack via a connection valve and exhausting the oxidizing gas from the stack to the outside of the stack;
A self-consuming means for self-consuming the fuel gas and the oxidizing gas inside the stack;
A connection valve is provided between at least one of the fuel gas supply unit of the stack and the connection valve of the fuel gas supply unit and between the fuel gas discharge unit of the stack and the connection valve of the fuel gas exhaust unit. A compression means for fuel gas comprising a cylinder having a pressing means on one end side connected to one end side and having a piston disposed on the inside and pressing the piston toward the one end side;
A connection valve is provided between at least one of the oxidation gas supply part of the stack and the connection valve of the oxidation gas supply means and between the oxidation gas discharge part of the stack and the connection valve of the oxidation gas exhaust means. And a compression means for oxidizing gas provided with a cylinder having a pushing means for pushing the piston toward the one end side and having a piston on the other end side. A polymer electrolyte fuel cell power generation system. In the polymer electrolyte fuel cell power generation system according to claim 1,
Fuel electrode side pressure measuring means for measuring the pressure on the fuel electrode side of the stack;
An oxidation electrode side pressure measuring means for measuring the pressure on the oxidation electrode side of the stack;
Based on the power generation operation stop signal, the connection valve of the gas supply means is controlled to be closed so that the supply of the fuel gas and the oxidizing gas to the stack is stopped, and the exhaust of the gas from the stack is performed. Close control of the connection valve of the exhaust means to stop, operation control of the self-consumption means to self-consume the fuel gas and the oxidizing gas inside the stack, the fuel electrode side pressure measurement means Based on the information from the above, when the pressure on the fuel electrode side of the stack becomes equal to or lower than the first fuel electrode side specified value, the inert gas supply means for the fuel electrode is supplied so as to supply the inert gas to the stack. When the pressure on the oxidation electrode side of the stack is equal to or lower than a first oxidation electrode side specified value based on the information from the oxidation electrode side pressure measuring means. After controlling the opening of the connecting valve of the oxidizing electrode inert gas supply means so as to supply the inert gas to the stack, the fuel of the stack is determined based on information from the fuel electrode side pressure measuring means. When the pressure on the pole side becomes equal to or higher than the second fuel electrode side specified value, the connection valve of the fuel electrode inert gas supply means is closed and controlled so as to stop the supply of the inert gas to the stack. Based on the information from the oxidation electrode side pressure measuring means, when the pressure on the oxidation electrode side of the stack becomes equal to or higher than a second oxidation electrode side specified value, the supply of the inert gas to the stack is stopped. And a control means for controlling the closing of the connection valve of the inert gas supply means for the oxidation electrode. The polymer electrolyte fuel cell power generation system according to claim 2,
The control means controls the opening of the connection valve of the gas supply means so as to supply the fuel gas and the oxidizing gas to the stack based on a power generation operation start signal, and the cylinder of the fuel gas compression means The connection valve of the fuel gas compression means is controlled to open so that the fuel gas flows into one end side of the fuel gas, and the oxidizing gas flows into one end side of the cylinder of the oxidation gas compression means. The connection valve of the oxidizing gas compression means is controlled to open, and based on the information from the fuel electrode side pressure measuring means, the pressure on the fuel electrode side of the stack is equal to or less than the first fuel electrode side specified value. Then, the connection valve of the fuel gas compression means is controlled to be closed, and the pressure on the oxidation electrode side of the stack is determined based on the information from the oxidation electrode side pressure measurement means. It becomes below the oxidizing electrode side predetermined value, the solid polymer fuel cell power generation system, characterized in that closing control the connection valve of the compression means for the oxidizing gas. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 3,
The polymer polymer fuel cell power generation, wherein the pressing means of at least one of the fuel gas compression means and the oxidizing gas compression means is an opening that opens the inside of the other end of the cylinder to the atmosphere. system. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 3,
The pressing means of at least one of the compression means for fuel gas and the compression means for oxidizing gas is a pressing inert gas supply means for supplying an inert gas under pressure to the other end side of the cylinder. Solid polymer fuel cell power generation system. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 3,
The solid polymer, wherein the pressing means of at least one of the fuel gas compressing means and the oxidizing gas compressing means is a water storage tank connected to the other end side of the cylinder and storing water therein. Fuel cell power generation system. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 3,
The solid polymer fuel cell power generation system, wherein the pressing means of the fuel gas compression means is pressing fuel gas supply means for supplying fuel gas under pressure to the other end of the cylinder. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 3,
The solid polymer fuel cell power generation system, wherein the pressing means of the oxidizing gas compression means is pressing oxidizing gas supply means for supplying an oxidizing gas under pressure to the other end of the cylinder. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 8,
The urging means for urging the piston toward one end side of the cylinder is provided in the inside of the other end side of the cylinder, and the pressing means of at least one of the compression means for the fuel gas and the compression means for the oxidizing gas A solid polymer fuel cell power generation system comprising a member. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 9,
The fuel gas surrounded by the connection valve of the fuel gas supply means, the connection valve of the inert gas supply means for the fuel electrode, the connection valve of the fuel gas exhaust means, and the cylinder of the fuel gas compression means. The volume of the flow path is such that the connecting valve of the oxidizing gas supply means, the connecting valve of the inert gas supplying means for the oxidizing electrode, the connecting valve of the oxidizing gas exhaust means, and the cylinder of the compressing means for oxidizing gas. The solid polymer fuel cell power generation system is characterized in that it is at least twice the volume of the flow path of the oxidizing gas surrounded by. In the polymer electrolyte fuel cell power generation system according to any one of claims 1 to 10,
A solid polymer fuel cell power generation system, wherein a cross-sectional area in the radial direction of the piston of the compression means for fuel gas and a cross-sectional area in the radial direction of the piston of the compression means for oxidizing gas are the same.

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