生物质氧气-蒸汽自热气化制取合成气过程能量-火用分析
摘要：摘要针对生物质气化制备合成气效率低、有效能分析不完善现状,提出以氧气-蒸汽为气化剂的自热气化系统,对该系统进行了模拟,建立热力学评价系统能量和㶲效率方法,重点分析未气化焦炭利用、氧气及蒸汽与原料质量比（O/B和S/B）和原料含水量对系统性能影响。结果表明,焦炭利用可大幅度提高合成气能量效率,但由于焦炭燃烧过程的㶲损失,使得系统总㶲效率降低。对高温气化气进行热量回收,产生的300 ℃蒸汽用于气化,可使S/B比达0.36以上,合成气氢碳比（H2/CO）达1.63,收率达1.18 m3/kg。系统总㶲效率和合成气㶲效率随气化S/B比增大而稍微降低,分别在74%和69%以上,但系统总能量效率显著降低,说明热量回收对提高系统总能量效率的重要作用,为提高系统总㶲效率,还应提升回收能量的品位。含水量为30%的生物质比较适合合成气制备。
Abstract:：In view of the inadequate efficiency of biomass gasification for syngas production and the lack of exergy analysis, an autothermal biomass gasification process with O2-steam was proposed and simulated in this study. The thermodynamic performance was studied and evaluated via the energy and exergy method. The effect of operation parameters was investigated, including the usage ratio of ungasified char, the mass ratios of O2 to biomass (O/B) and steam to biomass (S/B), and the moisture content of biomass. The results indicated that the high usage ratio of char significantly enhanced the energy efficiency for syngas production. However, the overall exergy efficiency decreased due to exergy loss within char combustion operation. Heat integration was designed by cooling high temperature gasification gas for steam generation (300 oC), which was introduced to the gasifier and resulted in a high S/B ratio of above 0.36 for gasification. Therefore, a high syngas yield of 1.18 m3/kg was obtained with H2 to CO ratio of 1.63 (H2/CO). With the increase of S/B ratio, the overall system exergy efficiency and syngas exergy efficiency slightly decreased, which was above 74% and 69% respectively. However, the overall system energy efficiency decreased, indicating heat recovery's critical effect on system thermal performance. Various heat integration strategies should be explored to improve the recovered heat's energy grade and increase system exergy efficiency. The feedstock with 30% moisture content was proper for syngas production.
中文标题：生物质氧气-蒸汽自热气化制取合成气过程能量-火用分析
英文标题：Energy and Exergy Analysis of Autothermal Biomass Gasification Process with O2-Steam Mixture for Syngas Production
发表时间：2023-03-12
作者：
谭烽华, 李宇萍, 彭建刚, 罗伟民, 董凯军, 龙金星
作者简介：
谭烽华（1998-）,男,硕士研究生,主要从事生物质燃料综合评价和多目标优化研究。李宇萍（1979-）,女,博士,研究员,主要从事可再生能源利用方面的研究。
关键词：生物质,自热气化,氧气-蒸汽,合成气,能量-火用分析,
Key words：biomass,autothermal gasification,O2-steam,syngas,energy and exergy analysis,
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