A kind of proton exchange membrane fuel cell start-up and stop control method
A proton exchange membrane, fuel cell technology, applied in fuel cells, fuel cell additives, circuits, etc., can solve problems such as fuel cell performance degradation, and achieve the effects of reducing oxygen concentration, time consumption, and system simplification
Inactive Publication Date: 2015-09-30
WUHAN UNIV OF TECH
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Problems solved by technology
[0009] The purpose of the present invention is to provide a proton exchange membrane fuel cell system for the current proton exchange membrane fuel cell system in the frequent start and stop process, the anode is easy to form a hydrogen / oxygen interface, resulting in the formation of a high potential of the cathode, thereby leading to the attenuation of fuel cell performance Battery start and stop control method
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[0031] The start-up and shutdown control method of a proton exchange membrane fuel cell of the present invention will be further described below in conjunction with the accompanying drawings.
[0032] The overall structure diagram of the proton exchange membrane fuel cell system of the present invention is as follows figure 1 Shown. The start and stop control method of the proton exchange membrane fuel cell system is realized by adding a modular discharge circuit and an air purge device on the basis of the traditional fuel cell system. Example ( figure 1 ) Divide the entire fuel cell stack into three battery modules. The first modular discharge circuit is composed of module 1 switch 18, module 1 resistor 19 and module 1 diode 26. The second modular discharge circuit is composed of the module 2 switch 20, the module 2 resistor 21 and the module 2 diode 27. The third modular discharge circuit is composed of the module 3 switch 22, the module 3 resistor 23 and the module 3 diode 28...
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The invention provides a starting and shutdown control method for a proton exchange membrane fuel cell. According to the method, a whole fuel cell stack is divided into a plurality of cell modules; each cell module is connected with a modularized discharging circuit which is composed of a control switch, an auxiliary load and a crystal diode in mutual series connection; each modularized discharging circuit and a main load circuit are in series connection and are respectively connected with the cathode end and the anode end of the fuel cell; an air source is connected with the anode end of the fuel cell through an air blow-down valve; and air is used to purge residual hydrogen at the anode. During starting control, hydrogen is used to purge the anode, and the auxiliary load is used to control the voltage of the cell; and during shutdown control, introduction of air and introduction of hydrogen are successively stopped, a closed system of the auxiliary load is used for discharging, and introduction of air is cooperatively used for purging of the anode. The invention has the following advantages: consumption of time during shutdown of the fuel cell is reduced; the concentration of residual oxygen at the cathode is lowered down; reversal of poles of a single cell in the modules is prevented, and the phenomenon of reversal of poles of the fuel cell in the processes of shutdown discharging and air purging is prevented; and the system of the fuel cell is more simplified and is convenient to operate.
Description
Technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a method for controlling the start and shutdown of a proton exchange membrane fuel cell. Background technique [0002] Fuel cell is an electrochemical power generation device. Due to its high energy conversion efficiency (50%~70%), environmental friendliness, low noise and other outstanding advantages, the research and development of fuel cell technology has attracted many governments and large companies. It is regarded as the clean and efficient power generation technology of choice in the 21st century. Among various types of fuel cells, the proton exchange membrane fuel cell (PEMFC) is suitable for portable power sources and transportation vehicles. Most of the fuel cells developed by automobile companies also focus on PEMFC. [0003] In addition to the advantages of all other fuel cells, the proton exchange membrane fuel cell has advantages that other fuel cells d...
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IPC IPC(8): H01M8/04H01M8/04223
CPCY02E60/50
Inventor 潘牧余意涂正凯陈奔徐云飞陈骏
Owner WUHAN UNIV OF TECH