Low-volume-fraction hydrogen-containing exhaust gas recovery system and method

The invention provides a low-volume-fraction hydrogen-containing exhaust gas recovery system. The system comprises a first compressor, a membrane separation unit communicated with the first compressor, a second compressor communicated with the membrane separation unit, a pressure swing adsorption system communicated with the second compressor and a gas cabinet communicated with the pressure swingadsorption system; the gas cabinet is communicated with the first compressor. The invention further provides a low-volume-fraction hydrogen-containing exhaust gas recovery method. According to the low-volume fraction hydrogen-containing exhaust gas recovery system and method, the hydrogen recovery rate is high, the raw material hydrogen composition requirement is low, and economic benefits are good. 本发明提供种低体积分数含氢排放气体的回收系统，包括第压缩机、与第压缩机连通的膜分离单元、与膜分离单元连通的第二压缩机、与第二压缩机连通的变压吸附系统以及与变压吸附系统连通的气柜，气柜与第压缩机连通。本发明还提供种低体积分数含氢排放气体的回收方法。上述低体积分数含氢排放气体的回收系统及回收方法，氢气回收率高、对原料氢组成要求较低且具有较好经济效益。