玉米秸秆循环流化床气化炉气化工艺参数优化  

Process parameter optimization for gasification of corn stalk in circulating fluidized bed gasifier

作　　者：常加富 徐鹏举 刘兆远 董玉平[3] 于杰 董磊 Chang Jiafu;Xu Pengju;Liu Zhaoyuan;Dong Yuping;Yu Jie;Dong Lei(Shandong Baichuan Tongchuang Energy Company Ltd.,Ji’nan 250101,China;Engineering Laboratory for Biomass Clean Conversion,Shandong Province,Ji’nan 250061,China;Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,Shandong University,Ji’nan 250061,China)

机构地区：[1]山东百川同创能源有限公司,济南250101 [2]山东省生物质能清洁转化工程实验室,济南250061 [3]山东大学高效洁净机械制造教育部重点实验室,济南250061

出　　处：《农业工程学报》2019年第5期226-233,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：公益性行业(农业)科研专项(201503135-07)

摘　　要：为实现秸秆类农业生物质废弃物的高效清洁能源化转化利用,采用带有二级返料系统的循环流化床气化炉对玉米秸秆进行了气化试验。在二级返料系统开启及闭合条件下,选取空气当量比为0.20～0.35,研究空气当量比对玉米秸秆气化特性的影响,结果表明二级返料系统开启及闭合两种工况均在空气当量比为0.26时取得较优值,二级返料系统开启时具有较好的气化效果,碳转化率与气化效率最大值分别达到93.54%与77.06%。在二级返料系统开启状态下,试验研究了水蒸气配比对玉米秸秆气化特性的影响,结果表明以空气为主气化介质,辅助以水蒸气气化,可以有效改善气化燃气品质,提升气化效率。当空气当量比为0.26、水蒸气配比为0.2时,玉米秸秆空气—水蒸气气化具有较好的气化特性,燃气热值与气化效率分别达到最大值5.89MJ/m3与81.45%。典型工况条件下的焦油蒸馏馏分分析结果表明,提高气化炉反应温度,并保持一定的水蒸气气化环境,可促进焦油裂解转化。试验可为秸秆类生物质的高效清洁转化利用提供参考依据。Large quantities of crop stalk resources are produced in China every year,and some of the stalks are incinerated,which pollutes the environment.Biomass gasification is attracting a great deal of attention as a way of utilizing biomass waste.In this study,a circulating fluidized bed experimental system was designed and constructed with a treating capacity of 150 kg/h,which equipped with secondary back-feeding device,steam generator and air preheater.The influences of secondary back-feeding device on the gasification performance were investigated with corn stalk after crushing and drying pretreatment as biomass feedstock.The effects of air equivalence ratio(ER)within 0.20~0.35 on gasifier temperature,tar content,gas composition,carbon conversion rate and gasification efficiency were investigated when the secondary back-feeding device was closed and open.The gasification reaction was promoted by increasing ER,and gasification efficiency and carbon conversion showed a trend of increasing firstly and then decreasing.The results showed that good gasification results were both obtained at ER of 0.26.When the secondary back-feeding device was closed,the maximum carbon conversion rate and gasification efficiency were 91.19%and 72.95%,respectively.Whereas the carbon conversion rate and gasification efficiency were higher when the secondary back-feeding device was open,which was up to 93.54%and 77.06%,respectively.The experimental results also showed that secondary back-feeding device had a good effect on tar cracking.When the secondary back-feeding device was closed and open,the tar content in gas was 7.5 g/m^3 and 4.5 g/m^3 at ER of 0.26,respectively,which meant that tar content can be decreased by 40%when secondary back-feeding system was open.The effects of steam/biomass ratio(S/B)on gasification characteristics were investigated when the secondary back-feeding device was open.The results showed that gas quality and gasification efficiency were improved with air as main gasifying agent and steam assisted.The better oper

关 键 词：生物质 气化 优化 玉米秸秆 循环流化床 空气当量比 水蒸气 二级返料系统 

分 类 号：TK6[动力工程及工程热物理—生物能]