Coupling control of escaped ammonia from SNCR by wet desulfurization in cement kiln
LIU Ding-ping, SHEN Kang
Guangdong Provincial Key Laboratory for Efficient and Clean Utilization of Energy, Guangdong Provincial Engineering Research Center for High Efficient and Low Pollution Conversion of Energy, School of Electric Power, South China University of Technology, Guangzhou 510640, China
Abstract: Aiming at the problem that ammonia escapes from the denitration system of cement decomposing furnace, a method is proposed to control the escaped ammonia by using a wet desulfurization system, making the ammonia emission in flue gas of cement industry reach China's national standard.Through performing experiments on the desulfurization system for flue gas of cement kiln, the removal characteristics of gaseous ammonia by wet desulfurization system are studied.The results show that the slurry absorption of wet desulfurization system can effectively remove gaseous ammonia from flue gas.The liquid-to-gas ratio, the pH value of the desulfurization slurry and the concentration of ammoniacal nitrogen in the slurry have a greater impact on the escape of ammonia in the flue gas.A higher liquid-to-gas ratio is beneficial to improve the removal efficiency of ammonia.The removal efficiency of ammonia increases from 86% to 92.5% when the liquid-to-gas ratio increases from 4.3 L·m-3 to 7.0 L·m-3;the removal efficiency drops from 94% to 67% when the pH of slurry increases from 5.8 to 6.4;it drops from 91.9% to 86% when the concentration of ammoniacal nitrogen increases from 4 030 mg·L-1 to 4 060 mg·L-1.
刘定平, 沈康. 水泥窑炉湿法脱硫耦合控制SNCR脱硝氨逃逸的研究[J]. 现代化工, 2022, 42(2): 225-228,235.
LIU Ding-ping, SHEN Kang. Coupling control of escaped ammonia from SNCR by wet desulfurization in cement kiln. Modern Chemical Industry, 2022, 42(2): 225-228,235.
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