加压流化床中影响生物质气化气组成因素的研究  

Study on the Sawdust Air Gasification in a Pressurized Fluidized Bed

作　　者：黄海峰[1] 秦育红[1] 吴志斌[1] 冯杰[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《太原理工大学学报》2007年第2期125-129,共5页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(20476068;90410018);国家重点基础研究发展计划项目(2004CB2176002;2005CB221201);山西省自然科学基金资助项目(20041008);教育部重点项目(204021);山西省回国留学人员基金资助项目(2006-29)

摘　　要：以加压流化床为反应器，锯末为原料，通过测定生物质空气气化产物的组成及其随反应条件变化的规律，确定了生物质结构与生物质气化气组成的关系。在700～850℃的温度范围内，以50℃为增量，考察了温度对气化产品气的影响。结果表明：CO是生物质气化的主要产物，在700～850℃的范围内，CO含量迅速升高，同时H2、CH4和烃类气体（包括CH4、C2H4、C2H2、C2H6、C3H4、C3H8）的含量也有升高，CO2的含量先升高后降低。生物质加压空气气化的实验中，压力从0．5MPa变化到1．7MPa，随着压力升高，CO2的体积分数上升，而CO和H2的体积分数下降，CH4和烃类气体的体积分数随压力的升高有上升趋势。生物质空气-水蒸气气化的实验中，水蒸气与生物质质量比ms／mB从1．1变化到2．6，随着ms／mB的升高，CO2，H2的体积分数均有所上升。反应结果表明，升高温度有助于生物质转化为气体；而压力越高越有利于CH4等烃类气体的生成，且随着压力的升高，反应器的处理量增大，反应程度加深；水蒸气的加入，减少了空气的消耗量，并生成了更多的H2及碳氢化合物，改善了产品气的质量。For the purpose of investigating the relation between biomass compositions and its gasification gas, the sawdust was gasified in a pressurized fluidized bed reactor under air atmosphere. The compositions of the gases obtained at different temperatures were analyzed from 700℃ to 850℃ in 50℃ steps. The results showed CO was the main gas product, also the volume fraction of all gas products increased from the range of 700-850℃ except CO2, the content of CO2 decreased above 800？ C. Furthermore, the gas products were studied from 0.5 to 1.7 MPa at 800℃. The volume fraction of CO and H2 decreased with the increasing pressure, but the volume fraction of CO2 , CH4 and Cn Hm were increased. The ms/mB varied from 1.1 to 2.6 in the airsteam gasification experiment. As the ms/mB mass ratio rose up, the volume fraction of CO2 and H2 increased. The higher temperature will benefit to the gasification of biomass. On the other side, the higher pressure contributed more the formation of hydrocarbon products such as methane, and promoted cracking reaction undergoing at lower temperature. The presence of steam reduced the consumption of air and increased the yield of H2, and so improved the quality of the production gas.

关 键 词：生物质 加压流化床 气化 空气 

分 类 号：TK6[动力工程及工程热物理—生物能]