Anode bleed control strategy for improved water management and hydrogen utilization
First Claim
1. A method for determining when to bleed an anode of a fuel cell stack, said method comprising:
- determining when to begin the anode bleed by a controller, wherein determining when to begin the anode bleed includes measuring the concentration of nitrogen in the anode of the fuel cell stack; and
determining when to end the anode bleed based on determining the volume of anode gas that has already been bled during the bleed event by the controller.
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Accused Products
Abstract
A control strategy for bleeding an anode side of fuel cell stack in a fuel cell system that improves water management and addresses durability and performance concerns. The method includes determining when to begin the anode bleed, typically by estimating or measuring the amount of nitrogen in the anode side of the stack. The method also includes determining when to end the anode bleed based on the volume of gas that has been bled. The method determines the mole flow rate of the anode gas flowing through a bleed valve, integrates the mole flow rate to get the number of moles of the gas that have passed through the bleed valve, determines a desired amount of moles to be bled, and ends the bleed when the actual number of moles of the gas equals the desired number of moles of the gas.
10 Citations
15 Claims
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1. A method for determining when to bleed an anode of a fuel cell stack, said method comprising:
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determining when to begin the anode bleed by a controller, wherein determining when to begin the anode bleed includes measuring the concentration of nitrogen in the anode of the fuel cell stack; and determining when to end the anode bleed based on determining the volume of anode gas that has already been bled during the bleed event by the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling an anode bleed from first and second split fuel cell stacks that operate under anode flow-shifting through first and second bleed valves, said method comprising:
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determining when to begin the anode bleed; determining the mole flow rate of the anode gas flowing through the bleed valves, wherein determining the mole flow rate of the anode gas through the bleed valves includes using the equation; - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for controlling an anode bleed from first and second split fuel cell stacks that operate under anode flow-shifting through first and second bleed valves, said method comprising:
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determining when to start the anode bleed based on the concentration of nitrogen in the anode of the split stacks by a controller; and determining when to end the anode bleed based on an anode time residence model that identifies the number of volumes of anode gas to be bled by the controller, wherein determining when to end the anode bleed includes determining the mole flow rate of the anode gas through the bleed valves, integrating the mole flow rate to get the number of moles of the gas that have passed through the bleed valves, determining a desired amount of moles of the gas to be bled, and ending the bleed when the actual number of moles of the gas that have passed through the bleed valves equals the desired number of moles of the gas to be bled, and wherein determining the mole flow rate of the anode gas through the bleed valves includes using the equation; - View Dependent Claims (15)
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Specification