含焦油生物质气再燃还原燃煤锅炉NO_x的试验研究  

Experimental Study on NO_X Reduction in a Coal-fired Boiler by Reburning Biomass Syngas with Tar

作　　者：殷仁豪[1] 罗永浩[1] 刘春元[1] 张睿智[1] 曹阳[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《动力工程学报》2012年第7期552-557,共6页Journal of Chinese Society of Power Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA05Z312)

摘　　要：搭建了10kW上吸式生物质气化炉和20kW煤粉沉降炉组成的生物质气化再燃试验系统,分析了不同再燃条件下含焦油生物质气再燃还原燃煤锅炉NOx的特性.结果表明:气化过程中产生的焦油在再燃过程中会裂解生成高热值的烃类气体,这些烃类气体还原NOx的效果明显;当过量空气系数较小、再燃温度较高时,NOx的还原效率较高,试验中最高还原效率超过80%;采用生物质气化再燃的方式既可以解决焦油难处理的问题,又可以提高生物质能量的转化效率,同时可高效降低燃煤锅炉NOx的排放量.A test rig, consisting of a 10 kW updraft biomass gasifier and a 20 kW pulverized-coal drop tube furnace, was established to investigate the technology of NOx reduction in a coal-fired boiler by reburning biomass syngas with tar under different reburning conditions. Results show that the tar produced in gasification process will crack into hydrocarbon radicals with high heat value, which have a positive effect on NOx reduction. Higher efficiency of NO, reduction may be obtained at lower excess air coefficients and higher reburning temperatures, and in the experiment, the data may get above 80%. The application of bi omass syngas reburning technology may help to handle the tough problem of tar disposal, raise conversion rate of biomass energy, and simultaneously reduce NOx emission from coal-fired boilers.

关 键 词：生物质 气化 焦油 再燃 燃煤锅炉 NOx 

分 类 号：TQ511.6[化学工程]