FUEL & CHEMICAL PROCESSES ›› 2019, Vol. 50 ›› Issue (2): 11-15.

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Numerical simulation of NOx formation in coke oven vertical flue

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

  1. 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

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%.

CLC Number: