Anode bleed control strategy for improved water management and hydrogen utilization

一种阳极气体、阳极的技术，应用在用于改善水管理和氢气利用的阳极排气控制策略领域，能够解决高电压下降速率、碳腐蚀、低氢气利用等问题

Active Publication Date: 2008-12-24
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]Due to poor water removal capacity during normal system operation, it is often believed that anode flow switching causes carbon corrosion and a correspondingly higher voltage drop rate
Also, anode flow switching often results in lower hydrogen utilization and thus lower fuel cell system efficiency, especially at low to medium power levels

Method used

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  • Anode bleed control strategy for improved water management and hydrogen utilization
  • Anode bleed control strategy for improved water management and hydrogen utilization
  • Anode bleed control strategy for improved water management and hydrogen utilization

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Embodiment Construction

[0013] The following description of the embodiments of the present invention intended for a control strategy for ending anode exhaust in a fuel cell structure with anode flow switching is merely exemplary in nature, and is not meant to limit the present invention or its application or use.

[0014] FIG. 1 is a schematic structural diagram of a fuel cell system 10 including a first split fuel cell stack 12 and a second split fuel cell stack 14. The compressor 16 provides the cathode input air on the cathode input line 18 to the separated cell stacks 12 and 14 through the normally closed cathode input valve 20. The cathode exhaust gas is output from the separation cell stack 12 through a line 24, and the cathode exhaust gas is output from the separation cell stack 14 through a line 26, and these cathode exhaust gases are mixed into a separate cathode output line 28. The normally closed cathode back pressure valve 30 controls the flow of cathode exhaust gas through the line 28. The c...

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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.

Description

Technical field [0001] The present invention generally relates to a control strategy for controlling anode exhaust from a fuel cell stack, and more specifically to a control strategy for controlling anode exhaust from a separate fuel cell stack, the control strategy being based on the exhaust Anode gas volume to improve water management and solve durability and performance issues. Background technique [0002] Hydrogen is a very attractive fuel because it is clean and can efficiently generate electricity in a fuel cell. A hydrogen fuel cell is an electrochemical device that includes an anode, a cathode, and an electrolyte between them. The anode receives hydrogen and the cathode receives oxygen or air. The hydrogen gas is decomposed in the anode to generate free protons and electrons. Protons pass through the electrolyte to the cathode. Protons react with oxygen and electrons in the cathode to produce water. The electrons from the anode cannot pass through the electrolyte, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04H01M8/24H01M8/10
CPCH01M8/04231H01M8/04462H01M8/04761H01M8/04992Y02E60/50
Inventor P·加德M·辛哈J·R·谢恩科夫斯基B·拉克什马南
Owner GM GLOBAL TECH OPERATIONS LLC
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