木屑气化制氢过程中气化剂对焦油含量的影响  

EFFECT OF GASIFYING MEDIUM ON TAR CONTENT IN HYDROGEN PRODUCTION FROM SAWDUST GASIFICATION PROCESS

作　　者：张尤华[1,2] 李文志[3] 张素平[1] 许庆利[1] 颜涌捷[1] 

机构地区：[1]华东理工大学生物质能研究中心,上海200237 [2]辽宁工程技术大学,辽宁125105 [3]中国科学技术大学安徽省生物质洁净能源重点实验室,合肥230026

出　　处：《太阳能学报》2012年第7期1235-1241,共7页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(No.2007CB210206)

摘　　要：通过改变流化床中反应性气体(水蒸气和氧气)的组成、不同粒径生物质的质量分布及流化床上部反应温度研究它们对粗气中焦油含量的影响及焦油的生成机理。实验结果表明:焦油含量随水蒸气与氧气物质的量比(以下用SOR表示)的减小、原料中小粒径生物质质量的增多及流化床上部温度的升高而降低。在较好的实验条件下,获得氢气产率为66.42g/kg biomass,H2、CO体积分数和为54.82%,焦油含量小于2g/Nm3dry gas,利于下一步催化裂解反应。焦油的生成与SOR关系密切,SOR较高时,焦油主要形成于生物质的裂解,组分复杂,并且以含氧化合物为主;随着SOR的降低,气化程度加深,带支链的苯环结构减少、少支链的苯环结构增多;当SOR降低到一定程度后,多环芳烃明显增多。Technological parameters such as composition of reactant gas, size distribution of raw material and tem- perature of the upper fluidized bed were investigated in order to conclude their effects on tar content and tar forma- tion mechanism. Results from experiments indicate tar content decrease as the ratio of steam and oxygen and bio- mass particle size decrease while temperature of upper fluidized bed increase. Highest hydrogen yield of 66.42g/kg biomass, highest total composition of H2 and CO of 54.82% , and tar content less than 2g/Nm^3 dry gas are obtained under the best experimental condition, and the lower tar content is good for raw gas catalytic steam reforming. The relationship between tar formation and SOR is very close. At high SOR, tar comes from biomass pyrolysis, and its component is very complex, main containing Oxygen-contaning compounds; At relative lower SOR, Oxygen-contan- ing compounds disappeared, and the structure of benzene with substituent groups is reduced, and the structure of benzene with less chain is increased; while SOR decrease to an extent, poly-aromatic compounds obviously in- creased.

关 键 词：生物质制氢 反应性气体 焦油裂解 焦油生成机理 

分 类 号：TK6[动力工程及工程热物理—生物能]