焦炉立火道NOx形成的数值模拟

燃料与化工 ›› 2019, Vol. 50 ›› Issue (2): 11-15.

焦炉立火道NOx形成的数值模拟

孟得慧1 包丹琪1 楼国锋1,2 温治1,2 苏福永1,2

1.北京科技大学能源与环境工程学院，北京100083；2.北京科技大学能源与环境工程学院冶金工业节能减排重点实验室，北京100083

出版日期:2019-03-23

Numerical simulation of NOx formation in coke oven vertical flue

Meng Dehui1 Bao Danqi1 Lou Guofeng1,2 Wen Zhi1,2 Su Fuyong1,2

1.School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China; 2.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

Online:2019-03-23

摘要/Abstract

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NOx生成的影响。结果表明，NOx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NOx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，NOx排放量降低13.7%。

Abstract:

Numerical simulation of NOx 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 NOx formation is studied.The result shows that most of NOx 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 NOx 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 NOx emission is reduced by 13.7%.

中图分类号:

TK16

孟得慧1 包丹琪1 楼国锋1,2 温治1,2 苏福永1,2. 焦炉立火道NOx形成的数值模拟[J]. 燃料与化工, 2019, 50(2): 11-15.

Meng Dehui1 Bao Danqi1 Lou Guofeng1,2 Wen Zhi1,2 Su Fuyong1,2. Numerical simulation of NOx formation in coke oven vertical flue[J]. FUEL & CHEMICAL PROCESSES, 2019, 50(2): 11-15.