An advanced process featuring CO shift, membrane permeation and in situ CO_2 capture is proposed for enhanced hydrogen production from biomass. Synthesis gas from a circulating fluidized bed gasifier operating at 800-930℃ and 8-30 bar, is converted into a hydrogen-rich gas in a shifter at 500-650℃. Simultaneous H_2 permeation and CO_2 removal via carbonation of half-calcined dolomite provide a double shift in equilibrium, significantly enhancing hydrogen production. The process can also produce pure CO_2, ideal for sequestration. A parametric study identifies preferable ranges of major process parameters. With proper membrane design, H_2 production could reach 0.125 kg H_2/kg biomass (dry basis), corresponding to an LHV-based cold-hydrogen efficiency of 72%, including parasitic power.
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机译：提出了一种具有CO转化，膜渗透和原位CO_2捕集的先进工艺，以提高生物质的产氢量。来自循环流化床气化炉的合成气在800-930℃和8-30 bar的压力下，在转换器中于500-650℃转化为富氢气。通过半煅烧白云石的碳化同时进行的H_2渗透和CO_2的去除提供了平衡的双重变化，从而显着提高了氢气的产生。该过程还可以产生纯净的CO_2，非常适合封存。参数研究确定了主要工艺参数的优选范围。通过适当的膜设计，H_2的产量可以达到0.125 kg H_2 / kg生物量（干基），相当于基于LHV的包括寄生功率在内的冷氢效率为72％。
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