基于烟气参数对SNCR还原剂雾化粒径和喷入量的模拟优化

doi:10.16085/j.issn.1000-6613.2017.02.044

化工进展 ›› 2017, Vol. 36 ›› Issue (02): 720-727.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

朱小明¹, 金保昇¹, 雷达², 王晓佳¹

1 东南大学能源热转换及其过程测控教育部重点实验室, 江苏南京 210096;
2 南京龙源环保有限公司, 江苏南京 210012

收稿日期:2016-06-20 修回日期:2016-08-02 出版日期:2017-02-05 发布日期:2017-02-05
通讯作者: 金保昇,教授,博士生导师,研究方向为煤和生物质发电技术及其相关的气固流动和热质传递。E-mail:bsjin@seu.edu.cn。
作者简介:朱小明(1993-),男,硕士研究生,研究方向为煤粉锅炉燃烧及脱硝过程的数值模拟和工程试验。E-mail:xmzhu@seu.edu.cn。
基金资助:
江苏省科技成果转化专项资金项目（BA2015083）。

The simulative optimization of atomization diameter and spray flux of reductant based on fume parameters in selective non-catalytic reduction(SNCR) process

ZHU Xiaoming¹, JIN Baosheng¹, LEI Da², WANG Xiaojia¹

1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China;
2 Nanjing Longyuan Environmental Corporation, Nanjing 210012, Jiangsu, China

Received:2016-06-20 Revised:2016-08-02 Online:2017-02-05 Published:2017-02-05

摘要/Abstract

摘要： 为降低烟气参数的不均匀分布对选择性非催化还原（SNCR）脱硝的影响，对220MW燃煤锅炉烟气状态分布特征及其对脱硝效果的影响进行数值研究，同时探讨了还原剂雾化粒径和喷入量的优化方案。研究表明，为保证还原剂在温度窗口内具有充足的反应时间，液滴的最佳平均粒径随高度而改变；此外，由于还原剂喷入区域烟气存在旋流作用，还原剂随烟气向炉膛局部“富集”，导致出口NH₃/NO分布不均匀。据此，提出了喷枪雾化参数的优化策略：①对不同高度处液滴的平均雾化粒径进行分层优化；②在固定氨氮摩尔比下，根据旋流特征调整不同区域喷枪的流量分配。模拟结果显示，氨氮摩尔比保持1.2时，相比电站基准工况，优化方案能够将脱硝率从36.8%提高到42.1%，漏氨量降低49%；此外，随着氨氮摩尔比的增大，优化方案体现出更好的脱硝效果，但是优化程度略有降低。

关键词: 选择性非催化还原, 雾化粒径, 喷射量, 模拟, 优化

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 NO_x 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 NO_x 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.

Key words: selective non-catalytic reduction, atomization diameter, spray flux, simulation, optimization

中图分类号:

X511

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(02): 720-727.

ZHU Xiaoming, JIN Baosheng, LEI Da, WANG Xiaojia. The simulative optimization of atomization diameter and spray flux of reductant based on fume parameters in selective non-catalytic reduction(SNCR) process[J]. Chemical Industry and Engineering Progree, 2017, 36(02): 720-727.

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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

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