中国电机工程学报2024，Vol.44Issue(9)：3588-3597,中插21,11.DOI:10.13334/j.0258-8013.pcsee.222563
低负荷下CFB锅炉二次风优化对NOx排放影响的数值模拟
Numerical Simulation of the Influence of CFB Boiler Secondary Air Optimization on NOx Emission Under Low Load
摘要
Abstract
In order to control the original NOx emission under low load of circulating fluidized bed(CFB)boiler,a 350 MW supercritical CFB boiler is taken as the research object,and the combustion process under 40%load is numerically simulated based on computational particle fluid dynamics(CPFD)method.The effects of different secondary air angles and new secondary air volumes on NOx emissions are analyzed.The results show that with the decrease of jet angle,the NO concentration at the furnace exit gradually decreases and the CO concentration does not increase significantly.The oxygen concentration in the dense phase area of the furnace decreases after part of the secondary air is moved up,leading to increased incomplete combustion,and a more reducing atmosphere,which inhibits the NO generation.When the additional air volume increases from 10%to 30%,the NO emission concentration is reduced by 17.2%.However,as the ratio increases further,the oxygen-deficient environment in the dense phase zone of the furnace causes a decrease in combustion efficiency and a significant decrease in temperature.Therefore,the original NO emission concentration can be reduced by increasing the proportion of new secondary air without affecting the combustion.关键词
循环流化床/计算颗粒流体力学/低负荷/二次风分级/氮氧化物Key words
circulating fluidized bed/computational particle fluid dynamics(CPFD)/low load/secondary air classification/nitrogen oxides分类
能源科技引用本文复制引用
侯跃华,刘海玉,申欣,康红红,谢玉婷,金燕,吴杨..低负荷下CFB锅炉二次风优化对NOx排放影响的数值模拟[J].中国电机工程学报,2024,44(9):3588-3597,中插21,11.基金项目
山西省重点研发计划项目(201903D321075). Key R&D Program of Shanxi Province(201903D321075). （201903D321075）
