成型生物质流化床气化及结渣影响因素研究  

Study on the Factors Affecting Gasification and Slag Formation of Biomass Briquettes in Fluidized Bed

作　　者：范浩东 李姜昊 张涵[1] 张雄[1] 张世红[1] FAN Haodong;LI Jianghao;ZHANG Han;ZHANG Xiong;ZHANG Shihong(National Key Laboratory of Coal Combustion and Low Carbon Utilization,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学煤燃烧与低碳利用全国重点实验室,武汉430074

出　　处：《动力工程学报》2024年第5期710-718,共9页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发专项资助项目(2016YFB0600203)。

摘　　要：为提高生物质气化产物的品质,采用成型桉树皮和成型玉米秸秆2种典型农林废弃物,并选取稻壳和木屑作为对比,在中试规模的流化床实验台上进行气化实验,得到成型桉树皮、成型玉米秸秆、稻壳和木屑的最佳空气当量系数,分析了成型生物质在气化中出现结渣现象的原因。结果表明:在实验条件下,成型桉树皮、稻壳和木屑的最佳空气当量系数为0.20,其燃气热值分别为5.5 MJ/m^(3)、5.5 MJ/m^(3)、6 MJ/m^(3),气化效率分别为60%、45%、52%;成型玉米秸秆由于其高灰分、低热值,所需空气量更大,最佳空气当量系数为0.24,燃气热值为4 MJ/m^(3),气化效率为35%;气化温度提高可促进不同生物质的气化反应,碱金属、碱土金属含量较多的成型生物质在气化过程中更易结渣。To enhance the quality of biomass gasification products,briquettes of eucalyptus bark and corn stalk were used as the typical feedstocks for the fluidized bed gasification experiments.Rice husks and sawdust were selected for comparison.Gasification experiments were conducted on a pilot-scale fluidized bed to obtain the optimal air equivalence ratio values for rice husks,sawdust,and the briquettes of eucalyptus bark and corn stalk.The causes of slagging during biomass briquettes gasification were analyzed.Results show that the optimal air equivalence ratio value for briquettes of eucalyptus bark,rice husks and sawdust is 0.20,and the gas heating values of the three biomass are 5.5 MJ/m^(3),5.5 MJ/m^(3) and 6 MJ/m^(3) respectively,the corresponding gasification efficiencies are 60%,45%and 52%.While the optimal air equivalence ratio value of corn stalk briquette is 0.24,which means requiring more air due to the high ash content and low heating value.The gas heating value of corn stalk briquettes is 4 MJ/m^(3),and the gasification efficiency is 35%.The increase in gasification temperature promotes the gasification reaction of various biomass.Biomass briquettes with high concentration of alkali and alkaline earth metals are more susceptible to slagging during gasification.

关 键 词：成型生物质 流化床气化 中试实验 气化效率 

分 类 号：TK62[动力工程及工程热物理—生物能]