化工进展2017，Vol.36Issue(2)：720-727,8.DOI:10.16085/j.issn.1000-6613.2017.02.044
基于烟气参数对SNCR还原剂雾化粒径和喷入量的模拟优化
The simulative optimization of atomization diameter and spray flux of reductant based on fume parameters in selective non-catalytic reduction (SNCR)process
摘要
Abstract
To reduce the effect of unevenly-distributed fume parameters on the selective non-catalytic reduction(SNCR),the state distribution of fume and its effect on the NOx removal efficiency of a 220 MW coal fired boiler were numerically studied. Meanwhile,the optimization methods for atomization diameter and spray flux of reductant were discussed. It is found that the most suitable average diameter of spray drops varies at different heights to guarantee the sufficient reaction time of SNCR process in the temperature window. Furthermore,a whirl flow remains in the SNCR area,along with which reductants are enriched to partial furnace,thus causing an uneven distribution of NH3/NO at the outlet. Accordingly,optimization strategies of atomization parameters are proposed:①Optimizing the average diameter of spray drops at different heights by layer;②Adjusting the distribution of spray flux in different regions according to the whirlwind characters under certain fixed molar ratio of NH3/NO. The simulation results indicate that the optimization plan can promote NOx removal efficiency to 42.1% from 36.8% and reduce NH3 slip by 49% compared to those of fiducial injection condition at the power plant under a NH3/NO molar ratio of 1.2. In addition,the optimization method gains preferred denitration results under higher NH3/NO molar ratios,while the effects of optimization slightly descend simultaneously.关键词
选择性非催化还原/雾化粒径/喷射量/模拟/优化Key words
selective non-catalytic reduction/atomization diameter/spray flux/simulation/optimization分类
资源环境引用本文复制引用
朱小明,金保昇,雷达,王晓佳..基于烟气参数对SNCR还原剂雾化粒径和喷入量的模拟优化[J].化工进展,2017,36(2):720-727,8.基金项目
江苏省科技成果转化专项资金项目（BA2015083）。 （）
