High temperature solid oxide fuel cell integrated with novel allothermal biomass gasification: Part II: Exergy analysis
High temperature solid oxide fuel cell integrated with novel allothermal biomass gasification: Part II: Exergy analysis
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DOI：
10.1016/j.jpowsour.2005.11.040
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发表时间：
2006-09
影响因子：
9.2
通讯作者：
K. Panopoulos;L. Fryda;J. Karl;S. Poulou;E. Kakaras
中科院分区：
文献类型：
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作者：
K. Panopoulos;L. Fryda;J. Karl;S. Poulou;E. Kakaras
生物质气化制得的燃气是一种可再生燃料，可用于高温燃料电池。在这两部分的工作中，试图研究集成的近大气压固体氧化物燃料电池（SOFC）与一种新的allothermal生物质蒸汽气化过程的热电联产（CHP）系统小于MWenominal输出范围。用于蒸汽气化的热量由SOFC贫化燃料经由高温钠热管供应到流化床燃烧器中。在白杨Plus ™模拟软件中建立了综合系统模型并进行了详细描述。第一部分调查的可行性和关键方面的系统建模结果的基础上。低气化蒸汽与生物质的比率（STBR = 0.6）用于避免过量的热需求并允许有效的H2S高温去除。在阳极之前加入水蒸气以避免碳沉积。当燃料利用系数<0.75时，SOFC废气充分提供气化热;否则必须燃烧额外的生物质，总效率损失。对于Uf = 0.7和电流密度2500 Am − 2的SOFC操作，电效率估计为36%，而热效率为14%。第二部分介绍了火用分析。
Biomass gasification derived fuel gas is a renewable fuel that can be used by high temperature fuel cells. In this two-part work an attempt is made to investigate the integration of a near atmospheric pressure solid oxide fuel cell (SOFC) with a novel allothermal biomass steam gasification process into a combined heat and power (CHP) system of less than MWenominal output range. Heat for steam gasification is supplied from SOFC depleted fuel into a fluidised bed combustor via high temperature sodium heat pipes. The integrated system model was built in Aspen Plus™ simulation software and is described in detail. Part I investigates the feasibility and critical aspects of the system based on modelling results. A low gasification steam to biomass ratio (STBR=0.6) is used to avoid excess heat demands and to allow effective H2S high temperature removal. Water vapour is added prior to the anode to avoid carbon deposition. The SOFC off gases adequately provide gasification heat when fuel utilisation factors are <0.75; otherwise extra biomass must be combusted with overall efficiency penalty. For SOFC operation with Uf=0.7 and current density 2500Am−2the electrical efficiency is estimated at 36% while thermal efficiency at 14%. An exergy analysis is presented in Part II.