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中文摘要：
基于Fluent软件平台,对410t/h燃煤锅炉中选择性非催化还原（SNCR）过程进行建模和模拟计算.计算结果与实验测量数据吻合很好,阐明了利用这种方法预测大空间、复杂温度场、复杂流场的锅炉炉膛中氮氧化物生成及还原过程的可行性.计算结果表明,在还原剂与氮氧化物初期混合条件有限的情况下,脱硝效果决定于物质的湍流扩散和温度场之间的相互作用.研究在不同喷射截面上温度和氨氮摩尔比对SNCR过程的影响,结果表明喷射截面应该取在平均温度位于SNCR＂温度窗口＂中部的截面所对应的高度处,在该工况下脱硝率在42%以上,且随氨氮摩尔比由1.0提高到2.2,脱硝率增长约58%.综合考虑尾部漏氨,氨氮摩尔比应该控制在1.4以下.
英文摘要：
Modeling and numerical simulation for the selective non-catalytic reduction （SNCR） process in a 410 t/h coal-fired boiler were conducted based on the Fluent software.Good agreement of the calculation results with the data measured in field experiment confirms the feasibility of the presented method for predicting the NOx formation and reduction processes in the furnace with large capacity,complex temperature field and complex flow field.The simulation shows that the NOx removal effect largely depends on the interaction between turbulence diffusion and temperature field,in the case that the reagent’s original mixing with NOx is quite limited.The influence of temperature level and NH3/NO molar ratio in different injecting cross-sections on the SNCR process was studied.The results show that the injecting cross-section should be placed at the corresponding height of the cross-section whose temperature located in the middle of the SNCR ＂temperature window＂.In this state,the NOx removal efficiency is above 42%,and it increases approximately by 58% when NH3/NO molar ratio rises from 1.0 to 2.2.However,considering the NH3 leakage in the empennage area simultaneously,NH3/NO molar ratio should be controlled bellow 1.4.
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