O2/CO2气氛下鼓泡流化床多粒径煤与生物质混燃模拟  

Simulation of Biomass and Coal Co-Firing with Different Diameter in Bubbling Fluidized Bed Under O_2/CO_2 Atmosphere

作　　者：吴轩 赵伶玲 陈超 Wu Xuan;Zhao Lingling;Chen Chao(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,School of Energy & Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《燃烧科学与技术》2018年第6期541-548,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51376045).

摘　　要：针对6,kW·h鼓泡流化床燃烧室,建立了流化床内煤与生物质混燃燃烧综合计算模型.模型中主要应用基于双欧拉方法的多组分KTGF子模型描述炉内颗粒流动状态,将煤与生物质分为粒径、密度及拟温参量不同的两相进行模拟计算,详细分析了流化床内流场、温度场和燃烧特性.结果表明,流动过程中炉内煤颗粒与生物质颗粒发生轻微分离;生物质颗粒在密相区上部分布较多,煤颗粒在密相区下部分布较多;生物质颗粒在近壁面处分布多于煤颗粒;煤与生物质混燃工况炉内的温度略高于单燃煤工况;炉内温度场及炉膛出口烟气浓度数值模拟结果与实验值吻合较好.A combustion model for6(kW·h)bubbling fluidized bed was established to simulate the process of biomass and coal co-firing in the fluidized bed under O2/CO2atmosphere,where biomass and coal were considered as two phases with different diameters and densities.The distributions of flow,temperature,and concentration in the furnace were analyzed.The results show that a slight flow separation between biomass and coal occurrs;the biomass particles are more likely to distribute at the top of the dense zone and the coal particles prefer to distribute at the bottom of the dense zone.The distribution of the biomass particles is higher than that of coal particles in the near wall region.The simulation results of temperature and concentration field are in good agreement with the experimental results.This study provides a new approach to the simulation of coal and biomass co-firing in fluidized bed.

关 键 词：流化床 O2/CO2气氛 煤与生物质混燃 多相流 

分 类 号：TQ028.8[化学工程]