Design and Analysis of Shale Gas Chemical Looping Reforming to Methanol Combined with Solid Oxide Fuel Cell Process
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摘要: 建立了页岩气化学链重整制甲醇联合固体燃料电池发电过程模型，并通过原料消耗、产品产出、过程能耗和㶲效率等指标对新流程进行技术分析。通过化学链重整制合成气和氢气来优化甲醇合成和实现页岩气的高效利用，通过将剩余氢气用于固体燃料电池发电和弛放气化学链燃烧供热实现电能自给并有盈余。还探讨了不同甲烷转化率对新过程技术性能的影响，甲烷转化率为60.0%的过程㶲效率仅为57%，而甲烷转化率为80.0%~99.3%的过程㶲效率高达71%~74%。Abstract: In this paper, the process models of the shale gas chemical looping reforming to methanol combined with the solid oxide fuel cell for power generation is established by the means of the system decomposition, unit modeling, and process simulation. The technical analysis of the new process is carried out through technical indexes, which consists of four aspects of raw material consumption, product output, process energy consumption, and exergy efficiency. In this paper, the efficient utilization of the shale gas resource is realized through the chemical looping reforming for simultaneously producing the syngas-hydrogen and then syngas used for methanol synthesis. After adjusting the composition of the syngas for methanol production, the remaining hydrogen is fueled to solid oxide fuel cell unit and the purge gas of the methanol synthesis is fueled to chemical looping combustion unit for power generation, by which the self-sufficiency as well as surplus of the electric energy can be achieved. Through the mass and energy integration between chemical looping reforming, chemical looping combustion, methanol synthesis, and solid oxide fuel cell, the technical and environmental performance of the shale gas chemical looping reforming to methanol combined with solid oxide fuel cell process can be significantly improved. This paper also discusses the influence of different methane conversion rates on the technical performance of the new process. In a word, the exergy efficiency of the process with 60.0%-methane conversion rate is only 57%, while the exergy efficiency of the process with 80.0%—99.3% methane conversion rate can be as high as 71%—74%.
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图 1 页岩气化学链重整制甲醇联合SOFC发电新过程流程图
Figure 1. Process flow diagram of a novel SG chemical looping reforming to methanol combined with SOFC for power generation
图 2 载氧体循环量对甲烷转化率、热负荷、
$n_{\rm{H}_2}/n_{\rm{CO}} $ 及重整气产量的影响Figure 2. Effect of oxygen carrier circulation quantity on methane conversion, heat duty,
$n_{\rm{H}_2}/n_{\rm{CO}} $ and reformed gas flow
图 3 甲烷转化率对重整气产量及热负荷的影响
Figure 3. Effect of methane conversion rate on reformed gas production and heat duty
图 4 甲烷转化率对页岩气消耗、氢气和甲醇产量及CO2捕集和排放的影响
Figure 4. Effect of methane conversion rate on SG consumption, hydrogen and methanol production, and CO2 capture and emissions
图 5 甲烷转化率对SOFC产电量和电压的影响
Figure 5. Effect of methane conversion rate on the power generation and voltage of the SOFC
图 6 甲烷转化率对㶲输入、输出和㶲效率的影响
Figure 6. Effect of methane conversion rate on exergy input, output, and exergy efficiency
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