生物质与煤掺烧中脉动气流对流化特性影响机制研究  

Study on pulsating airflow effect on the fluidization characteristics in biomass and coal co-firing process

作　　者：王敏 张静涛 张立敏 彭建升 张志鹏 刘春 WANG Min;ZHANG Jingtao;ZHANG Limin;PENG Jiansheng;ZHANG Zhipeng;LIU Chun(Yantai Longyuan Power Technology Co.,Ltd.,Yantai 264006,Shandong,China;Inner Mongolia Jinghai Coal Gangue Power Generation Co.,Ltd.,Wuhai 016000,Inner Mongolia,China)

机构地区：[1]烟台龙源电力技术股份有限公司,山东烟台264006 [2]内蒙古京海煤矸石发电有限责任公司,内蒙古乌海016000

出　　处：《能源化工》2024年第5期16-20,共5页Energy Chemical Industry

摘　　要：生物质与煤的掺烧已成为二氧化碳减排的重要手段,颗粒的混合分离行为直接影响反应器的性能,由于生物质和煤之间的粒径差异较大,传统气固两相流方法对于大差异颗粒流动预测存在着一定局限性。基于流化床反应器,对大差异粒径的生物质与煤颗粒的混合流化行为进行模拟研究,同时分析脉动气流对床内颗粒运动行为的影响。结果表明,相较于矩形波脉动形式,正弦波形式的脉动气流使颗粒在床层中的分布更加均匀。提高脉动气流的频率可以有效地促进生物质颗粒与煤颗粒在床内的混合,脉动气流幅值与颗粒的混合并非单调的变化关系,随着脉动气流幅值的增大,混合因子呈现先减小后增大的变化趋势。The co-cofiring of biomass and coal has become an important means of reducing carbon dioxide emission.The mixing and separation behaviors of particles affect the performance of the reactor.Due to the significant difference of particle size between biomass and coal,traditional gas-solid two-phase flow methods have limitations in the prediction of gas-solid flow with a clear particle size difference.Based on a fluidized bed reactor,fluidization behaviors of biomass and coal particles with large difference in particle size are studied by simulated research and the influence of pulsating airflow on particle motion behaviors in the bed is analyzed.The results show that in contrast to the rectangular wave pulsation form,the pulsating airflow in the form of the sine wave makes the particle distribution in the bed more uniform.The mixing of biomass and coal particles in the bed can be effectively promoted by increasing the frequency of pulsating airflow.The relationship between the amplitude of pulsating airflow and particle mixing is not monotonic.As the amplitude increases,the mixing index firstly decreases and then increases.

关 键 词：流化床 脉动气流 数值模拟 生物质 

分 类 号：TK62[动力工程及工程热物理—生物能] TQ021.4[化学工程]