烟气再循环在煤粉工业锅炉上的数值模拟研究  

Numerical simulation and investigation on flue gas recycle technology in industrial pulverized coal boiler

作　　者：李高亮 王乃继 肖翠微 刘振宇 刘羽 

机构地区：[1]煤炭科学技术研究院有限公司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试验室,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试验室,北京100013

出　　处：《洁净煤技术》2015年第2期125-128,133,共5页Clean Coal Technology

基　　金：煤炭科学研究总院技术创新基金资助项目(2014CX03)

摘　　要：为考察烟气再循环对工业煤粉锅炉NOx排放及炉内燃烧过程的影响,对30 t/h高效煤粉双锅筒室燃工业锅炉进行研究。采用数值模拟和试验研究,考察烟气再循环的低氮效果,分析烟气循环倍率对NOx排放浓度的影响,并研究循环倍率对炉膛温度、排烟温度等炉况的影响规律。结果表明:循环烟气通入炉内,火焰尺寸增大,温度更加均匀,减少了NOx的排放浓度;同时随着循环烟气的加大,排烟温度逐渐升高,蒸汽流量逐渐降低;当烟气循环倍率为20%时,NOx减排17%。In order to investigate the impact of flue gas recycle on NOx emissions and combustion process in industrial pulverized coal boil-er,the high efficiency industrial coal boiler of 30 t/h double drum chamber combustion was researched. Through numerical simulation and experimental study,the effects of flue gas recycle process and circulating ratio on NOx emissions,furnace temperature and exhaust gas tem-perature was investigated. The results showed that the circulating flue gas increased the flame size,uniformized the temperature of boiler and decreased NOx emissions. The increased circulating flue gas decreased the steam flow and improved exhaust gas temperature gradually. When the circulating ratio was 20%,the NOx emissions decreased by 17%.

关 键 词：烟气再循环 数值模拟 过量空气系数 循环倍率 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]