微型流化床中生物质半焦水蒸气气化反应特性及动力学研究  

Reaction characteristics and kinetics of biomass char-steam gasification in micro-fluidized bed reaction analyzer

作　　者：王婷婷[1] 曾玺 韩振南[1] 王芳 武鹏[1] 许光文 WANG Tingting;ZENG Xi;HAN Zhennan;WANG Fang;WU Peng;XU Guangwen(Key Laboratory on Resources of Chemicals and Materials of Ministry of Education,Shenyang University of Chemical Technology,Shenyang 110142,Liaoning,China;School of Ecology and Environment,Beijing Technology and Business University,Beijing 100048,China;State Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]沈阳化工大学资源化工与材料教育部重点实验室,辽宁沈阳110142 [2]北京工商大学生态环境学院,北京100048 [3]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190

出　　处：《化工学报》2022年第1期294-307,共14页CIESC Journal

基　　金：国家重点研发计划项目(2018YFF01011400);国家自然科学基金项目(21808227)。

摘　　要：利用微型流化床反应分析仪考察了1123~1223 K及10%~40%蒸汽分压(SP)条件下生物质半焦-水蒸气气化的反应特性并计算动力学。结果表明:升高温度和SP有利于缩短反应时间,提高产物(H_(2)、CO和CO_(2))生成率及总C转化率。低温(1123 K)下,反应受SP影响较大,以H_(2)最为明显,增幅达1.97倍;在1223 K、SP≥20%条件下,因受活性位点制约,SP对反应影响较小。随温度升高,CO/CO_(2)体积产率比呈现出先减小后增大趋势;在1123 K和1173 K下,随SP升高,CO/CO_(2)的体积产率比值降低;在1223 K下,该值维持在1.25左右。采用缩核模型求取不同SP下总碳转化活化能(E_(a))在71.29~76.78 kJ/mol范围内,H_(2)、CO_(2)和CO的生成活化能分别在95.44~101.82、83.56~89.35和70.41~74.86 kJ/mol之间。测试结果弥补了现有分析仪难以测定气化过程中气体产物生成特性和动力学的局限性。Reaction characteristics and kinetics of biochar gasification with steam at temperature(T)of 1123-1223 K and steam partial pressure(SP)of 10%-40%were studied by a micro fluidized bed reaction analyzer(MFBRA).It shows that increasing T and SP was beneficial to shorten reaction time and increase the production of gaseous product(H_(2),CO and CO_(2))and total C conversion.At low temperature(1123 K),gasification reaction was greatly affected by SP,especially for H_(2) with an increase of 1.97 times.At 1223 K and SP≥20%,due to the limitation of active sites,SP had little effect.With the increase of T,the volume yield ratio of CO/CO_(2) showed a trend of first decreasing and then increasing;at 1123 and 1173 K,with the increase of SP,the ratio decreased;while at 1223 K,it basically maintained at 1.25.The generation active energy(Ea)of H_(2),CO_(2),and CO under different SP was calculated via shrinking core model,which were in the range of 95.44-101.82,83.56-89.35 and 70.41-74.86 kJ/mol.The Ea of total C conversion was in the range of 71.29-76.78 kJ/mol.The test results make up for the limitations of existing analyzers that are difficult to determine the gas product generation characteristics and kinetics during the gasification process.

关 键 词：半焦 水蒸气 等温气化 微型流化床 反应动力学 

分 类 号：TQ541[化学工程—煤化学工程]