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Retaining water in a fuel cell stack for cooling and humidification during frozen startup
Retaining water in a fuel cell stack for cooling and humidification during frozen startup
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机译：在冻结启动期间将水保留在燃料电池堆中以进行冷却和加湿
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摘要
A fuel cell power plant (19, 19a) has a plurality of fuel cells (70, 70a, 70c) arranged in a stack (20, 20c), each fuel cell having porous, at least partially hydrophilic water transport plates (75, 81) with fuel (74) and oxidant (82) reactant gas channels, there being water channels (78, 85, 78a, 85a, 78c, 85c) exchanging water with the water transport plates. On shut down, water is retained in the water channels and water transport plates by means of either a micro vacuum pump (46), one or two valves (89, 90, 118, 120), a check valve (95, 99), capillary force in the water channels to prevent water from entering the reactant channels which, if frozen, could block flow of reactant gas upon startup.
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机译：燃料电池发电厂（ 19，19 a ）具有多个燃料电池（ 70，70 a ， 70 c ）排列成堆（ 20、20 c ），每个燃料电池在至少部分亲水的输水板（ 75，81 ）带有燃料（ 74 ）和氧化剂（ 82 ）反应气体通道，其中有水通道（ 78、85、78 a， 85 a， 78 c， 85 c ）与输水板交换水。关闭时，水会通过微型真空泵（ 46 ），一个或两个阀门（ 89、90、118、120 < / B>），一个止回阀（ 95、99 ），水通道中的毛细作用力可防止水进入反应物通道，如果冻结，则在启动时可能会阻塞反应物气体的流动。
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