900MW超临界锅炉混煤燃烧的数值模拟  

Numerical Simulation of Co-combustion of Blended Coal in a 900MW Supercritical Boiler

作　　者：张宏伟[1] 王波[1] 袁益超[1] 金能毅 

机构地区：[1]上海理工大学动力工程多相流动与传热重点实验室,上海200093

出　　处：《锅炉技术》2014年第6期47-52,共6页Boiler Technology

基　　金：上海市科技创新行动计划资助(11dz1203801)

摘　　要：利用Fluent软件对某900 MW四角切圆燃烧的煤粉锅炉混煤燃烧过程进行数值模拟,研究了煤种和配比对炉内燃烧过程的影响,并与燃烧设计煤种时的锅炉炉内状态进行了比较分析。结果表明:在掺烧混煤时,与单烧设计煤种相比,锅炉炉膛内的温度分布相似,烟气充满度比较好,炉膛出口烟温稍高,灰污层外表面温度低于神木煤灰分的软化温度,结渣的可能性较小;神木煤与澳洲煤4∶1和3∶2掺烧时,能使锅炉安全运行,掺烧方案是可行的。The co-combustion of different coals in the furnace of a supercritical 900 MW tangentially fired pulverized coal boiler is numerically simulated with Fluent.The influence of coal properties and blending strategies on the combustion process is analyzed,and the results are compared with the operation parameters when the designed coal is fired.It is shown that the temperature distribution is similar to that calculated at design condition,and combustion gas filling fullness is good.The furnace outlet gas temperature at co-burning conditions is slightly higher.Meanwhile,the temperature in the outer surface of the ash layer on the water wall is lower than the softening temperature of the Shen Mu coal ash,so there would be little possibility of slagging.The simulation results show that the co-combustion of these coals in this boiler would be safe when Shen Mu coal with Australia in 4∶1and 3∶2blended.

关 键 词：超临界锅炉 燃烧 数值模拟 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]