Experimental on fly ash recirculation with bottom feeding to improve the performance of a circulating fluidized bed boiler co-burning coal sludge

摘要：

With the aim of reducing carbon content in fly ash,fly ash recirculation with bottom feeding (FARBF) technology was applied to a 75fh Circulating Fluidized Bed (CFB) boiler burning mixture of coal and coal sludge.And industrial experiments were carried out to investigate the influence of FARBF technology on the combustion performance and pollutant emission characteristics of the CFB boiler.Results show that as the recirculation rate of fly ash increases,the CFB dense bed temperature decreases while the furnace outlet temperature increases,and the temperature distribution in the furnace becomes uniform.Compared with the conditions without fly ash recirculation,the combustion efficiency increases from 92％ to 95％ when the recirculation rate increases to 8t/h,and the desulfurization efficiency also increases significantly.As the recirculation rate increases,the emissions of NO and CO decrease,but the particulate emission increases.The present study indicates that FARBF technology can improve the combustion performance and desulfurization efficiency for the CFB boilers burning coal sludge,and this can bring large economical and environmental benefits in China.

关键词： Circulating Fluidized Bed (CFB) Fly ash Recirculation with Bottom Feeding (FARBF) Combustion Efficiency Desulfurization Efficiency Pollutant emissions

作者: Lunbo Duan Guiling Xu Daoyin Liu Xiaoping Chen Changsui Zhao

作者单位: School of Energy and Environment,Southeast University,Nanjing,210096,China

会议类型: 国际会议

会议名称: The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)

会议地点: 哈尔滨

会议语种:英文

页码: 375-379

在线出版日期: 2011-07-19（万方平台首次上网日期，不代表论文的发表时间）