摘要
针对焦炉立火道内的废气循环燃烧多浓度场过程开展数值模拟,详细研究了空气和煤气入口尺寸及废气循环对NO_x生成的影响。结果表明,NO_x绝大部分是在上升立火道高度方向的中间位置高温区生成;增加外循环烟气量可以降低燃烧温度和缩小高温区域,从而降低NO_x生成量;当外循环率为20%时,最高温度降低88℃,温度场更加均匀;当入口面积减小为原来的1/2时,内循环率增加至原来的1.95倍,NO_x排放量降低13.7%。
Numerical simulation of NO_x formation is done for the multi-concentration fields of waste gas recirculation combustion inside coke oven vertical flues.The impact of air and gas inlet size and waste gas recirculation to the NO_x formation is studied.The result shows that most of NO_x is formed at the high temperature zone in the middle of rising vertical flue.Increasing external gas circulation would reduce the combustion temperature and narrow thermal peak so as to decrease the NO_x formation.When the external circulation rate is 20%,the maximum temperature is lowered by 88 ℃ and the temperature field gets more uniform.When the inlet area is cut by half,the internal circulation rate is increased to 1.95 times and the NO_x emission is reduced by 13.7%.
作者
孟得慧
包丹琪
楼国锋
温治
苏福永
Meng Dehui;Bao Danqi;Lou Guofeng;Wen Zhi;Su Fuyong(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry,School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《燃料与化工》
2019年第2期11-15,共5页
Fuel & Chemical Processes
基金
国家重点研发计划
干燥煤绿色化高效炼焦技术及应用示范(2017YFB0304303)
关键词
燃烧室
结构参数
数值模拟
NO_x
Combustion chamber
Structural parameter
Numerical simulation
NO_x
