影响焦炉NO_x生成的数值模拟  

Numerical simulation of the influence on NO_x formation in waste gas

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)

机构地区：[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　　处：《燃料与化工》2019年第3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)

摘　　要：选取JN60型焦炉的单对立火道,利用CFD数值模拟,对传热传质过程进行仿真,计算结果与设计值基本吻合。在此基础上改变焦炉热流密度和跨越孔尺寸,从污染物源头降低NO_x的排放,从而指导工程实际。模拟结果表明,热流密度对NO_x影响很大,当热流密度为4 800 W/m^2时,NO_x浓度为742 mg/m^3,当热流密度为7 600 W/m^2时,NO_x浓度为135.1 mg/m^3,降低了约600 mg/m^3;跨越孔开度越大,则内循环率越大,反应区随之增大,反应物消耗速率降低,NO_x生成量减少。A pair of vertical flues of JN60 coke oven combustion chamber are selected.The CFD numerical simulation is used to establish a coupled model of air depleted combustion intensity and combustion fluid multi-concentration field.The heat mass transfer process was simulated,and the calculation results are basically consistent with the design values.On this basis,heat flux density of the coke oven and turn point size were changed to minimize the NOx emission fundamentally.The simulation result shows that the heat flux density has much influence on the NOx,i.e.when the heat flux density is 4,800 W/m^2,the NO_x concentration is 742 mg/m^3,when the heat flux density reaches 7,600 W/m^2,the NOx concentration drops down to 135.1 mg/m^3,reduced by about 600 mg/m^3;similarly,the more opening of the turn point,the higher inner circulation rate,the wider reaction zone,the lower consumption rate of the reactant and the lower NOx formation as a result.

关 键 词：焦炉 燃烧室 数值模拟 NOx 

分 类 号：TQ520.1[化学工程—煤化学工程]