大型循环流化床锅炉钟罩式风帽流化特性试验研究  

Experimental study on fluidization characteristics of bell-type air nozzle in large scale CFB boiler

作　　者：陈子曦 卢啸风[1] 范会勇 龙潇飞 范立元 刘世荣 王泉海[1] 李建波[1] 亢银虎[1] CHEN Zixi;LU Xiaofeng;FAN Huiyong;LONG Xiaofei;FAN Liyuan;LIU Shirong;WANG Quanhai;LI Jianbo;KANG Yinhu(Key Laboratory of Low Grade Energy Utilization Technology and System of Ministry of Education,Chongqing University,Chongqing 400044,China;Datang Wu’an Power Generation Co.,Ltd.,Wu’an 056300,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [2]大唐武安发电有限公司,河北武安056300

出　　处：《热力发电》2020年第5期50-57,共8页Thermal Power Generation

基　　金：国家重点研发计划项目(2016YFB0600201)。

摘　　要：本文针对国内几种应用于大型循环流化床锅炉中的钟罩式风帽的流化特性进行了冷态及热态试验研究。参考电站锅炉实际运行工况,采用电阻法测量了风帽附近料层的气固流动特性,并采用高速摄影观测了不同流化风温度时风帽周边料层大颗粒的运动特性。试验结果表明,钟罩式风帽内芯小孔总面积对风帽阻力特性和流化特性的影响较大,增大流化风量、提高流化风温度均能使钟罩式风帽的扰动范围增加,风帽周边大颗粒堆积高度降低,料层的扰动特性变好。本文的研究工作可为大型循环流化床电站锅炉风帽的优化设计和运行中风帽磨损、变负荷布风板结焦等不正常运行问题的分析与解决提供参考。The fluidization characteristics of bell-type air nozzles used in several domestic large scale circulating fluidized bed(CFB)boilers were studied in cold and hot states.Based on the actual operating conditions of power station boilers,the gas-solid flow characteristics of the material layer near the air nozzle were measured by resistance method,and the motion characteristics of large particles in the material layer around the air nozzle at different fluidized wind temperatures were observed with high-speed photography.The results show that,the inner tube orifice area has a greater effect on the resistance characteristics and fluidization characteristics.Increasing the fluidizing air volume and the fluidizing air temperature could enlarge the disturbance range of the bell-type air nozzle,decrease the large particle parking height around the air nozzle,and improve the disturbance characteristics of the material layer.The research work can provide references for optimization design of bell-type air nozzle in large scale CFB boilers and the analysis and corresponding solution of operational problems,such as nozzle wear and boiler slagging with load changing.

关 键 词：钟罩式风帽 循环流化床 阻力特性 流化特性 大颗粒堆积高度 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]