Fuel cell system and method for influencing the thermal and temperature budget of a fuel cell stack
A technology of fuel cell system and fuel cell stack, which is applied in the direction of fuel cell heat exchange, fuel cell, fuel cell additives, etc., and can solve problems such as output drop and insufficient temperature of cathode exhaust gas
Inactive Publication Date: 2009-11-18
ENERDAY GMBH (DE)
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Problems solved by technology
[0004] Problems can arise in the case of insufficient cathode exhaust gas temperature due to the fact that the temperature distribution in the fuel cell stack does not always have the desired uniform distribution
This can cause the fuel cell stack to be cooled or heated to an undesired extent, which in turn thermomechanically stresses the fuel cell stack, causing a drop in output
Method used
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[0042] Refer below figure 1 , shows a schematic representation of a fuel cell system according to the invention. The fuel cell system includes a reformer 44 that receives a supply of fuel and gas through the fuel feeder 32 and the blower 34, respectively. In addition to the fuel feeder and blower 34 shown, additional fuel feeders and blowers may be provided, enabling variations in the design of the reforming process. In this example, the reformer 30 is used to carry out catalytic reforming, which is based entirely on the operation of a gas as an oxidizing agent. However, it is to be understood that the present invention is not so limited and other oxidizing agents (such as water) may also be used. In the reformer 44 , a hydrogen-rich reformate 36 is produced, which is supplied to the anode terminal of the fuel cell stack 10 . The cathode end of the fuel cell stack 10 receives a supply of cathode feed gas through a cathode blower 28 . At the output, cathode exhaust gas 38 a...
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The invention relates to a fuel cell system having a fuel cell stack (10), an afterburner (12) for burning off gas emerging from the fuel cell stack, and a heat exchanger (16) which is arranged in an off-gas passage (14) from the afterburner and in which cathode supply air (18) to be supplied to the fuel cell stack can be heated. The invention provides for the capability to supply cathode supply air (20) to the fuel cell stack (10) without previously having been heated in the heat exchanger (16), and for the capability to use the total amount of cathode supply air supplied as well as the ratio of the component of the cathode supply air (18, 20) that has been heated in the heat exchanger and of that which has not been heated in the heat exchanger to influence the thermal and temperature budget of the fuel cell stack (10). The invention also relates to a method for influencing the thermal and temperature budget of a fuel cell stack.
Description
technical field [0001] The present invention relates to a fuel cell system comprising a fuel cell stack, an afterburner, and a heat exchanger located in the exhaust pipe of the afterburner, the The exhaust gas of the fuel cell stack is combusted, and the cathode feed gas supplied to the fuel cell stack can be heated in the heat exchanger. [0002] The invention also relates to a method of influencing the heat and temperature budget of a fuel cell stack located in a fuel cell system, in other words a method of tweaking the heat and temperature balance, said fuel cell The system also includes an afterburner for combusting exhaust gas exhausted from the fuel cell stack, and a heat exchanger located in the exhaust pipe of the afterburner, where the The cathode feed gas supplied to the fuel cell stack may be heated in the heat exchanger. Background technique [0003] As the core unit of the fuel cell system, the fuel cell stack reacts the hydrogen-rich reformate supplied to the...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M8/04
CPCH01M8/0612H01M8/04014Y02E60/50Y02E60/525H01M2008/1293
Inventor S·克丁N·京特周苏J·劳伦斯
Owner ENERDAY GMBH (DE)