Solid polymer type fuel cell system for power generation

Abstract

A fuel cell system for power generation comprising a solid polymer type fuel cell having a solid polymer electrolyte membrane for separating an anode gas and a cathode gas, a resistor, an inverter, a switch for switching the inverter and the resister with respect to the fuel cell, the switch and the inverter, a supply conduit and discharge conduit for the anode gas and the cathode gas, and a supply vale and a discharge valve. When a molar ratio of the hydrogen contained in the anode gas to oxygen contained in the cathode gas becomes 2/1 or less at the time of the stop of the fuel cell, the supply valve for air is closed.

1 . A fuel cell system comprising a solid polymer type fuel cell having a solid polymer electrolyte membrane for separating an anode gas and a cathode gas, a resistor, an inverter, a switch for switching the inverter and the resister with respect to the fuel cell, a cable for connecting the fuel cell, the switch and the inverter, a supply conduit and discharge conduit for the anode gas and the cathode gas, and a supply vale and a discharge valve, wherein when a molar ratio of the hydrogen contained in the anode gas to oxygen contained in the cathode gas becomes 2/1 or less at the time of the stop of the fuel cell, the supply valve for air is closed.  
   
   
       2 ) The fuel cell system according to  claim 1 , which further comprises a control device for closing the supply valve of air to the fuel cell.  
   
   
       3 ) The fuel cell system according to  claim 1 , wherein the solid polymer type fuel cell and the resistor are connected before the supply valve and the discharge vale of hydrogen are closed, and wherein the control device controls the resister so that the outer current flowing through the resister is taken to oxidize hydrogen in the anode gas.  
   
   
       4 . The fuel cell system according to claims  2 , wherein the control device has a function to close the supply valve and discharge valve for the anode gas after the supply valve and discharge valve are closed.  
   
   
       5 . A power generation system comprising a solid polymer type fuel cell having a solid polymer electrolyte membrane for separating anode gas and cathode gas, a resister, an inverter, an electrical connection between the fuel cell and the inverter, a switch for switching the electrical connection between the fuel cell and the resister, a supply conduit and discharge conduit for anode gas with respect to the fuel cell, a supply conduit and discharge conduit for cathode gas with respect to the fuel cell, and a supply valve and discharge valve connected to the supply conduit and discharge conduit respectively, wherein at the time. of stopping the fuel cell, the supply vale of the anode gas is closed, and the supply valve of air to the fuel cell is closed when a molar ratio of hydrogen contained in the anode gas to oxygen contained in a cathode gas, the cathode gas being separated by the solid polymer membrane is 2/1 or less.  
   
   
       6 . A power generation system comprising a solid polymer type fuel cell having a solid polymer electrolyte membrane for separating anode gas and cathode gas, a resister, an inverter, a switch for switching an electrical connection between the fuel cell and the resister, a supply valve and discharge vale connected to the supply conduit and discharge conduit respectively, wherein at the time of stopping the fuel cell, the supply valve of the anode gas is closed, and the supply valve of air to the fuel cell is closed when a molar ratio of hydrogen contained in the anode gas to oxygen contained in the cathode gas separated from the anode gas by the solid polymer membrane is 2/1 or less.  
   
   
       7 . A power generation system comprising a solid polymer type fuel cell having a solid polymer electrolyte membrane for separating anode gas and cathode gas, a resister, an inverter, an electrical connection between the fuel cell and the inverter, a switch for switching the electrical connection between the fuel cell and the resister, a supply conduit and discharge conduit for anode gas with respect to the fuel cell, and a supply conduit and discharge conduit for cathode gas with respect to the fuel cell, a supply valve and discharge vale connected to the supply conduit and discharge conduit respectively, wherein at the time of stopping the fuel cell, the supply vale of the anode gas is closed, and the supply valve of air to the fuel cell is closed when a molar ratio of hydrogen contained in the anode gas to oxygen contained in the cathode gas separated from the anode gas by the solid polymer membrane is a predetermined value or less.