Exergy analysis of hydrogen production plants based on biomass gasification
Exergy analysis of hydrogen production plants based on biomass gasification
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DOI：
10.1016/j.ijhydene.2008.05.059
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发表时间：
2008-08
影响因子：
7.2
通讯作者：
R. Toonssen;Nico Woudstra;A. Verkooijen
中科院分区：
文献类型：
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作者：
R. Toonssen;Nico Woudstra;A. Verkooijen
生物质气化是可持续生产富氢气体的一种有前途的选择。五种不同的商业或中试规模的气化系统被认为是一个制氢装置，产生几乎纯氢气的设计。对于每一种气化技术，在Cycle-Tempo中开发了两种不同制氢装置的模型：一种装置具有低温气体清洁（LTGC），另一种具有高温气体清洁（HTGC）。所有工厂的热输入是具有相同干成分的10 MW生物质。对所有过程进行了火用分析。比较了它们的热力学性能（氢产率和火用效率）。由于模型中没有考虑热回收，因此计算了两个效率。第一个是针对所有余热都可以利用的情况，即有理想的热回收的情况进行计算，另一个是针对没有热回收的情况进行计算。预计在真实的系统中，只能利用一部分余热。因此，实际值将在这些计算值之间。结果发现，三种工艺具有几乎相同的性能：LTGC的Battelle气化工艺，LTGC的FICFB气化工艺，和HTGC的Blaue Turm气化工艺。所有系统都包括将来自生物质气化的清洁气体进一步加工成几乎纯的氢气。对于无热回收的系统，计算的火用效率分别为50.69%、45.95%和50.52%。有热回收系统的效率分别为62.79%、64.41%和66.31%。三种工艺的计算氢产率差别不大。Battelle LTGC工艺的氢产率似乎为0.097 kg（kg（干生物质））−1，FICFB LTGC工艺的产率为0.096 kg（kg（干生物质））− 1，Blaue Turm HTGC工艺的产率为0.106 kg（kg（干生物质））−1。由于Blaue Turm气化工艺远远落后于Battelle和FICFB工艺的技术，因此可以得出结论，进一步考虑Battelle和FICFB工艺对于产生高纯氢气是优选的。
Biomass gasification is a promising option for the sustainable production of hydrogen rich gas. Five different commercial or pilot scale gasification systems are considered for the design of a hydrogen production plant that generates almost pure hydrogen. For each of the gasification technique models of two different hydrogen production plants are developed in Cycle-Tempo: one plant with low temperature gas cleaning (LTGC) and the other with high temperature gas cleaning (HTGC). The thermal input of all plants is 10MW of biomass with the same dry composition. An exergy analysis of all processes has been made. The processes are compared on their thermodynamic performance (hydrogen yield and exergy efficiency). Since the heat recovery is not incorporated in the models, two efficiencies are calculated. The first one is calculated for the case that all residual heat can be applied, the case with ideal heat recovery, and the other is calculated for the case without heat recovery. It is expected that in real systems only a part of the residual heat can be used. Therefore, the actual value will be in between these calculated values. It was found that three processes have almost the same performance: The Battelle gasification process with LTGC, the FICFB gasification process with LTGC, and the Blaue Turm gasification process with HTGC. All systems include further processing of the cleaned gas from biomass gasification into almost pure hydrogen. The calculated exergy efficiencies are, respectively, 50.69%, 45.95%, and 50.52% for the systems without heat recovery. The exergy efficiencies of the systems with heat recovery are, respectively, 62.79%, 64.41%, and 66.31%. The calculated hydrogen yields of the three processes do not differ very much. The hydrogen yield of the Battelle LTGC process appeared to be 0.097kg (kg(dry biomass))−1, for the FICFB LTGC process a yield of 0.096kg (kg(dry biomass))−1was found, and for the Blaue Turm HTGC 0.106kg (kg(dry biomass))−1. Since the Blaue Turm gasification process is far behind the technologies of the Battelle and FICFB processes it is concluded that further consideration of the Battelle and FICFB processes has to be preferred for the generation of highly pure hydrogen.