Fuel cell system
A fuel cell system and fuel cell technology, applied in fuel cells, fuel cell additives, solid electrolyte fuel cells, etc., can solve problems such as fuel cell deterioration, insufficient anode gas, and reduced power generation efficiency
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no. 1 approach
[0024] A fuel cell operates by sandwiching an electrolyte membrane between an anode electrode (fuel electrode) and a cathode electrode (oxidant electrode), supplying an anode gas (fuel gas) containing hydrogen to the anode electrode, and supplying oxygen-containing gas to the anode electrode. positive electrode gas (oxidant gas) to generate electricity. The electrode reactions performed at the two electrodes of the negative electrode and the positive electrode are as follows.
[0025] Negative electrode: 2H 2 →4H + +4e - …(1)
[0026] Positive electrode: 4H + +4e - +O 2 →2H 2 O...(2)
[0027] Through the electrode reactions of (1) and (2), the fuel cell generates an electromotive force of about 1 volt.
[0028] Figure 1A and Figure 1B It is a figure explaining the structure of the fuel cell 10 which concerns on 1st Embodiment of this invention. Figure 1A It is a schematic perspective view of the fuel cell 10 . Figure 1B yes Figure 1A The B-B sectional view o...
no. 2 approach
[0104] Next, a second embodiment of the present invention will be described. The present embodiment differs from the first embodiment in that normally, the higher the anode pressure upper limit value P, the larger the determination value C0 is. The following description will focus on this difference. In addition, in each of the following embodiments, the same reference numerals are used for parts that perform the same functions as those of the above-mentioned first embodiment, and overlapping descriptions are appropriately omitted.
[0105] When a command to increase the anode pressure occurs during the down transient operation, the normal anode pressure upper limit value P is basically set in accordance with the operating state of the fuel cell system 1 .
[0106] Here, when the down transition operation is performed again after raising the anode pressure to the normal anode pressure upper limit value P, the anode pressure is lowered to The lower limit value takes longer. ...
no. 3 approach
[0113]Next, a third embodiment of the present invention will be described. The present embodiment differs from the first embodiment in the following point: when the anode pressure is increased to the stagnation discharge anode pressure upper limit value P1 after the down transient operation, the anode pressure is increased based on the anode gas concentration in the buffer tank 36 Return to the normal negative pressure upper limit P. The following description will focus on this difference.
[0114] As mentioned above, the controller 4 adjusts the opening of the purge valve 38 according to the operating state of the fuel cell system 1, and controls so that the buffer concentration (the concentration of the anode gas in the buffer tank 36) Cbuff is equal to the operating state of the fuel cell system 1. Corresponding desired administration concentration.
[0115] When the buffer concentration Cbuff is lower than the management concentration, the anode gas supplied from the buf...
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