煤粉工业锅炉燃用中等挥发分煤种适应性研究  

Research on the middle volatile coal adaptability for pulverized-coal industrial boiler system

作　　者：纪任山[1,2,3] 

机构地区：[1]煤炭科学研究总院节能工程技术研究分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室,北京100013 [3]国家能源煤炭高效利用与节能减排技术装备重点实验室,北京100013

出　　处：《计算机与应用化学》2014年第7期779-782,共4页Computers and Applied Chemistry

基　　金：国家国际科技合作专项(2011DFA60390)

摘　　要：为扩大煤粉工业锅炉燃用中等挥发份煤种的适应性,本文利用数值模拟,分析了20t/h单体锅炉燃烧系统中燃烧器与炉膛的温度分布情况,以及炉膛卫燃带对温度的影响。模拟结果表明,对比设计煤种火焰,中等挥发分煤种火焰长度短、厚度薄、最大火焰温度低,火焰低温区域过大是中等挥发分煤燃烧不稳定的主要原因;敷设卫燃带能提升炉膛温度和煤粉燃尽率,最佳卫燃带敷设方案为炉膛顶部前6 m处敷设面积为9%卫燃带。系统改造后,锅炉燃烧稳定,运行效果达到设计要求。In order to extend the pulverized-coal industrial boiler system＇s middle volatile coal suitability, by using the numerical simulation, the temperature distribution of burner and furnace in the 20 t/h industrial boiler＇s combustion system and the effect of refractory belt on temperature distribution in furnace were analyzed. The result of simulation shows that compare with the flame of design coal, the flame of middle volatile coal is short length, thin thickness and the maximum combustion temperature is low. The large low temperature region in the flame of middle volatile coal is the major causes of combustion instability. The refractory belt can increase the furnace temperature and burnout rate. The optimal rehabilitation programs is laying 6 m refractory belt on the top of furnace and the refractory belt area is 9 % of furnace area. After modification, the system is stable and operating results meet the design requirements.

关 键 词：数值模拟 燃烧器 煤种适应性 卫燃带 

分 类 号：TK16[动力工程及工程热物理—热能工程]