Fuel cell system
A fuel cell system and fuel cell technology, applied in fuel cells, fuel cell additives, circuits, etc., to achieve the effects of increasing exhaust flow, suppressing excessive rise in impurity concentration, and suppressing useless emissions
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Embodiment approach 1
[0036] (Configuration of Embodiment 1)
[0037] figure 1 It is a diagram schematically showing the configuration of a fuel cell system to which the present invention is applied. The fuel cell system generates electricity from the fuel cell 2 and supplies the power to loads such as motors. A typical fuel cell 2 is used in the form of a fuel cell stack in which a plurality of individual fuel cells are stacked. Although not shown in the figure, a single fuel cell has a structure in which a membrane electrode assembly is sandwiched between a pair of collector plates. The membrane electrode assembly is a member in which a catalyst is integrally formed on both surfaces of a solid polymer electrolyte membrane, and a gas diffusion layer made of a carbon sheet or the like is integrally formed on each surface. The collector plate also functions as a separator that separates two adjacent membrane electrode assemblies. Each single fuel cell generates electricity by receiving supply of...
Embodiment approach 2
[0093] In Embodiment 1, impurities are discharged during the shutdown process of the system. On the other hand, in Embodiment 2, the same exhaust control is performed when the system is requested to perform intermittent operation. In addition, the configuration of the system according to the second embodiment is the same as that of the system according to the first embodiment. In the following description, the system of Embodiment 2 is based on figure 1 The composition of the premise is assumed, and descriptions of overlapping matters are omitted.
[0094] As a method of operating the fuel cell 2 , there are continuous operation in which the fuel cell 2 normally generates power and intermittent operation in which the fuel cell 2 intermittently stops the power generation. When the amount of power required by the load 50 side is small, by intermittently stopping the power generation of the fuel cell 2, the consumption of hydrogen gas can be suppressed and the fuel efficiency c...
Embodiment approach 3
[0102] As described above, when the operation is stopped in Embodiment 1 and when the intermittent operation is started in Embodiment 2, exhaust gas is performed in a state where impurities are collected on the downstream side of the anode-side gas flow path 42 . (cleaning). In Embodiment 3, the presence or absence of a purge execution request is determined in consideration of wider application of the exhaust control, and the above-described exhaust control process is performed when there is a request. In addition, the configuration of the system according to the third embodiment is the same as that of the system according to the first embodiment. In the following description, the system configuration of Embodiment 3 is figure 1 The composition of the premise is assumed, and the description of the overlapping items is omitted.
[0103] Figure 8 It is a flowchart of the program executed by the system of Embodiment 3. Figure 8 The procedure is to Figure 5 Steps S100, S10...
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