【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。更多还原

【Abstract】 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 NO_x emission fundamentally.The simulation result shows that the heat flux density has much influence on the NO_x,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 NO_x 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 NO_x formation as a result.更多还原