[1]周英贵,金保昇.大型燃煤锅炉SNCR/SCR混合脱硝数值模拟及工程验证[J].东南大学学报(自然科学版),2016,46(2):304-310.[doi:10.3969/j.issn.1001-0505.2016.02.013]
 Zhou Yinggui,Jin Baosheng.Numerical simulation and engineering confirmation of hybird SNCR/SCR process in commercial coal-fired boiler[J].Journal of Southeast University (Natural Science Edition),2016,46(2):304-310.[doi:10.3969/j.issn.1001-0505.2016.02.013]
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大型燃煤锅炉SNCR/SCR混合脱硝数值模拟及工程验证()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
46
期数:
2016年第2期
页码:
304-310
栏目:
能源与动力工程
出版日期:
2016-03-20

文章信息/Info

Title:
Numerical simulation and engineering confirmation of hybird SNCR/SCR process in commercial coal-fired boiler
作者:
周英贵金保昇
东南大学能源热转换及其过程测控教育部重点实验室, 南京210096
Author(s):
Zhou Yinggui Jin Baosheng
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
补氨 还原剂 均匀性 偏差系数
Keywords:
ammonia complement reducing agent uniformity deviation coefficient
分类号:
TK229
DOI:
10.3969/j.issn.1001-0505.2016.02.013
摘要:
为了提高选择性非催化还原/选择性催化还原(SNCR/SCR)混合脱硝中的还原剂在锅炉尾部烟道内的分布均匀性,基于FLUENT平台,对300 MW燃煤机组SNCR/SCR混合脱硝系统进行了数值模拟,重点分析转向室补氨喷射位置、混合器结构对烟气中氨氮组分混合的影响,计算结果与试验测量数据吻合很好.结果表明:SNCR反应后,转向室出口还原剂分布极不均匀;转向室侧墙补氨喷枪越靠近转向角位置,越有利于提升烟道内还原剂的平均分布;SCR反应器入口烟道设置新型复合X型混合器,进一步强化NH3与烟气的均匀混合,反应器首层催化剂入口截面还原剂浓度分布偏差从22%降低至7.4%;将优化的补氨喷射位置与混合器结构应用于现场锅炉,SNCR和SCR脱硝效率分别达到了35%和78.4%,SNCR/SCR联合脱硝效率达85.96%,脱硝效果良好.
Abstract:
To improve the uniform distribution of the reducing agent in the tail flue of the hybrid selective non-catalytic reducing and selective catalytic reducing(SNCR/SCR)process, numerical simulation was performed for the hybrid SNCR/SCR process in a 300 MW pulverized-coal boiler by using the FLUENT software. The influence of ammonia supplementary position and mixture structure on the distribution of ammonia nitrogen in flue gas was emphatically analyzed. The calculation results agree well with the experimental data. the results reveal that after the SNCR reaction, the concentrations of the reducing agent distribute quite unevenly at the outlet of the reversing chamber. However, with the ammonia supplementary position approaching the reversing angle, the uniform distribution of the reducing agent is improved. Additionally, the distribution can be further optimized by arranging the new hybrid X-mixer device at the inlet of the SCR system. The standard deviation factor for the concentration of the reducing agent in the inlet section of the first layer catalyst of the reactor decreases from 22% to 7.4%. With the combination of the optimized ammonia supplementary position and the new hybrid X-mixer device applied to the industrial boiler, the De-NOxx efficiencies of SNCR and SCR process can achieve 35% and 78.4%, respectively, and the total combined De-NOxx efficiency of the SNCR/SCR is up to 85.96%, showing a satisfactory denitration performance.

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备注/Memo

备注/Memo:
收稿日期: 2015-11-05.
作者简介: 周英贵(1977—),男,博士生;金保昇(联系人),男,教授,博士生导师,bsjin@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51276038).
引用本文: 周英贵,金保昇.大型燃煤锅炉SNCR/SCR混合脱硝数值模拟及工程验证[J].东南大学学报(自然科学版),2016,46(2):304-310. DOI:10.3969/j.issn.1001-0505.2016.02.013.
更新日期/Last Update: 2016-03-20