摘要
在小型两段式固定床反应器中,对生物质热解气在高温煤焦层中的裂解反应特性进行了研究,重点考察了两段式热解中裂解温度、停留时间及煤焦特性对焦油裂解率、气体产率及成分的影响.结果表明,增加气体停留时间及裂解温度,都有利于促进生物质气中焦油裂解和气体产率提高.裂解温度对气体产率、组分及焦油裂解率影响更明显,高温促进H2和CO的生成,1000℃时H2和CO的含量达到94.51%.当生物质热解气在煤焦中停留时间达到1.41s后,气体中各组分变化趋于缓慢;不同热解条件所制得的煤焦对生物质气中焦油裂解效果不同,较低制焦温度和较短热解时间都有利于增加煤焦的反应活性,促进焦油分解为可燃气体.
In a two-stage fixed bed, the cracking characteristics of tar derived from biomass pyrolysis in a high temperature coal char were studied. The results show that higher temperature is favor to the cracking of biomass tar. Both long residence time in char and the cracking temperature can decrease the tar yield with the increase of gas yield and H2 percentage. The prepare condition of char has influence on the gas yield and composition. Low pyrolysis temperature and short residence time can increase reactivity of coal char and are favor to the higher H2 and CO percentage.
出处
《煤炭转化》
CAS
CSCD
北大核心
2010年第2期80-84,共5页
Coal Conversion
基金
国家高技术研究发展计划(863)项目(2007AA05Z324)
关键词
生物质
热解
焦油
煤焦
裂解
biomass, pyrolysis, tar, coal char, crack
