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论文类型：期刊论文

发表时间：2016-06-01

发表刊物：FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING

收录刊物：SCIE、EI、ISTIC、CSCD

卷号：10

期号：2

页面范围：255-264

ISSN号：2095-0179

关键字：hydrogen purification; PSA; membrane separation; hybrid process

摘要：Hydrogen was recovered and purified from coal gasification-produced syngas using two kinds of hybrid processes: a pressure swing adsorption (PSA)-membrane system (a PSA unit followed by a membrane separation unit) and a membrane-PSA system (a membrane separation unit followed by a PSA unit). The PSA operational parameters were adjusted to control the product purity and the membrane operational parameters were adjusted to control the hydrogen recovery so that both a pure hydrogen product (>99.9%) and a high recovery (>90%) were obtained simultaneously. The hybrid hydrogen purification processes were simulated using HYSYS and the processes were evaluated in terms of hydrogen product purity and hydrogen recovery. For comparison, a PSA process and a membrane separation process were also used individually for hydrogen purification. Neither process alone produced high purity hydrogen with a high recovery. The PSA-membrane hybrid process produced hydrogen that was 99.98% pure with a recovery of 91.71%, whereas the membrane-PSA hybrid process produced hydrogen that was 99.99% pure with a recovery of 91.71%. The PSA-membrane hybrid process achieved higher total H-2 recoveries than the membrane-PSA hybrid process under the same H-2 recovery of membrane separation unit. Meanwhile, the membrane-PSA hybrid process achieved a higher total H-2 recovery (97.06%) than PSA-membrane hybrid process (94.35%) at the same H-2 concentration of PSA feed gas (62.57%).