600MW墙式对冲燃煤锅炉燃烧数值模拟  

Numerical Simulation on the Combustion in a 600 MW Opposed Firing Boiler

作　　者：李道林 王文欢 潘卫国 LI Daolin;WANG Wenhuan;PAN Weiguo(School of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Shanghai Engineering Research Center of Power Generation Environmental Protection,Shanghai 200090,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090 [2]上海发电环保工程技术研究中心,上海200090

出　　处：《动力工程学报》2020年第2期110-116,共7页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2018YFB0604204);国家自然科学基金资助项目(21546014);上海市科技攻关资助项目(18DZ1202502)。

摘　　要：为了得到精确的SCR脱硝系统烟气参数(如速度、温度和NO_x浓度),建立了从锅炉炉膛到省煤器出口的全系统研究模型,对某600 MW亚临界对冲燃煤锅炉进行了数值模拟,将旋流燃烧器与炉膛作为一个计算域来模拟,过热器、再热器和省煤器等区域的受热面换热采用用户自定义函数(UDF)进行处理,得到了整个锅炉的速度场、温度场、NO_x体积分数以及省煤器出口的烟气参数。结果表明:省煤器出口的烟气参数分布不均匀,采用省煤器出口参数作为SCR脱硝系统设计或优化的条件,有利于提高脱硝效率、降低氨逃逸率。To accurately quantify the main parameters(such as speed,temperature and NOx concentration)of the flue gas entering the denitration system,a research model was established for the whole system from the boiler furnace to the economizer outlet,and subsequently numerical simulations were conducted on a 600 MW subcritical opposed firing boiler,during which,the swirl burner and the furnace were simulated as a calculation domain,the heating surfaces in the region of superheater,reheater and economizer were processed by user defined function(UDF),and the velocity field,temperature field and NOx concentration of the boiler and the outlet flue gas parameters of the economizer were obtained.Results show that the outlet flue gas parameters of the economizer are unevenly distributed.The denitration efficiency could be significantly improved while the ammonia escape rate could be remarkably reduced when the outlet parameters of the economizer are taken as the design or optimization conditions for the SCR denitration system.

关 键 词：对冲锅炉 旋流燃烧器 SCR脱硝系统 数值模拟 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]