摘要
以某热源厂75 t/h四角切圆煤粉锅炉为研究对象,采用数值模拟的方法对不同烟气再循环率下炉内的燃烧及NOx排放特性进行研究。结果表明,烟气再循环技术可使炉内整体温度降低,烟气再循环率越高,炉膛温度下降越快;烟气再循环率增大,入炉二次风O2含量降低,主燃区CO浓度先增加后减小,炉内NOx浓度分布降低;烟气再循环率在20%时,炉膛出口NOx浓度为417 mg/Nm^3,相比未采用烟气再循环,锅炉脱硝率提升26.1%。
Taking a 75 t/h square-corner pulverized coal boiler in a heat source plant as the research object, the numerical simulation method was used to study the combustion and NOx emission characteristics of the furnace under different flue gas recirculation rates. The results show that the flue gas recycling technology can reduce the overall temperature in the furnace, the higher the flue gas recycling rate, the faster the furnace temperature drops;the flue gas recirculation rate increases, the secondary air O2 content in the furnace decreases, the main combustion zone The CO concentration increased first and then decreased, and the NOx concentration distribution in the furnace decreased. When the flue gas recirculation rate was 20%, the NOx concentration at the furnace outlet was 417 mg/Nm^3. Compared with the flue gas recirculation, the boiler denitration rate increased by 26.1%.
作者
陈松林
樊俊杰
张忠孝
白昊
CHEN Song-lin;FAN Jun-jie;ZHANG Zhong-xiao
出处
《电站系统工程》
2019年第6期1-4,共4页
Power System Engineering
关键词
烟气再循环率
炉膛温度
NOX排放
数值模拟
flue gas recirculation rate
furnace temperature
NOX emission
numerical simulation
