脱硝效率及氨逃逸是SCR脱硝装置的两项关键性能参数. 脱硝效率反映脱硝装置能否将氮氧化物控制在合适的范围内, 氨逃逸反映通过催化还原过程尾气中NH3的残留. SCR 烟气脱硝反应是一种复杂的气固非均相催化反应, 通过冷模试验耗时耗力且也无法准确预测脱硝效率及氨逃逸. 本文通过对气固非均相催化反应机理的研究, 确定计算参数, 并通过大量尝试计算, 明确CHEMKIN和CFD耦合催化反应机理计算SCR的步骤和方法; 并以工程为依托, 对SCR催化反应中影响脱硝效率及氨逃逸的各因素进行CHEMKIN计算、 CFD耦合CHEMKIN机理计算, 将结果与修正曲线、 现场试验进行相应的比较研究.%Denitration efficiency and ammonia escape are the two core performance parameters of SCR-DeNOx system. The denitration efficiency reflects whether the denitration device can take control of nitrogen oxides in a proper range, while the ammonia escape reflects residue of NH3 in flue gas by catalytic reduction. SCR is a complex gas-solid heterogeneous catalytic reaction, using the cold test that is by time-consuming can not accurately predict denitration efficiency and ammonia escape rate. This paper, based on the study of gas-solid heterogeneous catalytic reaction mechanism, determines the calculation parameters, and through a large number of trial calculation, definitudes the steps and methods of CHEMKIN and CFD coupled catalytic reaction mechanism on SCR calculation. The theories have been applied in some projects, to calculate the affects of denitration efficiency and ammonia escape rate on SCR catalytic reactions with CHEMKIN calculation, CFD calculation of the coupling CHEMKIN mechanism, compare the results of correction curve and field tests.
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