Wood Gas Processing To Generate Pure Hydrogen Suitable for PEM Fuel Cells

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• 作者：Silvester Fail ; Nicolas Diaz ; Florian Benedikt ; Michael Kraussler ; Julian Hinteregger ; Klaus Bosch ; Marius Hackel ; Reinhard Rauch ; Hermann Hofbauer
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2014
• 出版时间：December 1, 2014
• 年：2014
• 卷：2
• 期：12
• 页码：2690-2698
• 全文大小：407K
• ISSN：2168-0485

文摘

A test campaign was carried out to generate renewable hydrogen based on wood gas derived from the commercial biomass steam gasification plant in Oberwart, Austria. The implemented process consisted of four operation units: (I) catalyzed water鈥揼as shift (WGS) reaction, (II) gas drying and cleaning in a wet scrubber, (III) hydrogen purification by pressure swing adsorption, and (IV) use of the generated biohydrogen (BioH₂) in a proton exchange membrane (PEM) fuel cell. For almost 250 h, a reliable and continuous operation was achieved. A total of 560 (L_{n聽dry聽basis聽(db)})/h of wood gas were extracted to produce 280 (L_n聽db)/h of BioH₂ with a purity of 99.97 vol %_db. The catalyzed WGS reaction enabled a hydrogen recovery of 128% (峁?/i>_BioH2)/(峁?/i>_{H2,wood聽gas}) over the whole process chain. An extensive chemical analysis of the main gas components and trace components (sulfur, C_xH_y, and ammonia) was carried out. No PEM fuel cell poisons were measured in the generated BioH₂. The only detectable impurities in the product were 0.02 vol %_db of O₂ and 0.01 vol %_db of N₂.

Keywords:

Biohydrogen; Biomass; Gasification; Product gas; Water鈭抔as shift; Gas scrubbing; Pressure swing adsorption; Latex