低负荷烟气再循环对煤粉锅炉燃烧及NOx排放的影响  

Influence of Low-load Flue Gas Recirculation on Combustion and NO Emission in Pulverized Coal Boiler

作　　者：刘坤朋 魏博[1] 陈丽娟[1] 王建江 李建[1] 刘江山 LIU Kunpeng;WEI Bo;CHEN Lijuan;WANG Jianjiang;LI Jian;LIU Jiangshan(Key Laboratory of Coal Clean Conversion and Chemical Engineering Process,Xinjiang University,Urumqi 830046,China`)

机构地区：[1]新疆大学煤炭清洁转化与化工过程自治区重点实验室,乌鲁木齐830046

出　　处：《动力工程学报》2021年第5期345-349,379,共6页Journal of Chinese Society of Power Engineering

摘　　要：以某330 MW锅炉结构参数和低负荷运行参数为依据,针对低负荷下不同烟气循环率对炉膛内截面平均温度、O2体积分数、CO体积分数以及NOx排放质量浓度的影响进行模拟分析。结果表明:低负荷下采用一次风烟气再循环能有效降低锅炉NOx排放质量浓度;随着烟气循环率的提高,炉膛内截面平均温度逐渐降低,CO体积分数逐渐减小,NOx排放质量浓度降低;与无烟气再循环相比,烟气循环率为15%时NOx排放质量浓度降低67.88 mg/m3,NOx减排效率提高20.36%。Based on the structural parameters and low-load operation parameters of a 330 MW boiler, effects of different flue gas circulation rates on average temperature, O2 volume fraction, CO volume fraction and NOx emission mass concentration in the furnace at low load were analyzed. Results show that NOx emission mass concentration can be effectively reduced by flue gas recirculation with primary air at low load. With the increase of flue gas recirculation rate, average furnace temperature, CO volume fraction and NOx emission mass concentration gradually decrease. Compared with no flue gas circulation, at the flue gas circulation rate of 15%, NOx emission mass concentration is reduced by 67.88 mg/m3 and NOx emission reduction efficiency is increased by 20.36%, respectively.

关 键 词：低负荷 烟气再循环 NOX排放 煤粉锅炉 数值模拟 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]