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浙江大学学报(工学版)  2020, Vol. 54 Issue (10): 1986-1992    DOI: 10.3785/j.issn.1008-973X.2020.10.016
能源工程、机械工程     
水泥炉窑SNCR-SCR联合脱硝中试实验研究
韦彦斐1,3(),周荣2,周敏捷2,高翔1
1. 浙江大学 能源工程学院,浙江 杭州 310027
2. 浙江省环境保护科学设计研究院,浙江 杭州 310012
3. 浙江省环境科技有限公司,浙江 杭州 311100
Pilot study on combined denitration of SNCR-SCR system in cement furnace
Yan-fei WEI1,3(),Rong ZHOU2,Min-jie ZHOU2,Xiang GAO1
1. College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
2. Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou 310012, China
3. Zhejiang Environmental Technology Limited Company, Hangzhou 311100, China
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摘要:

以水泥炉窑氮氧化物(NOx)脱除为研究对象,分析烟气温度、入口NOx质量浓度、氨氮摩尔比(NSR)、催化剂装载量和积灰时间等对选择性催化还原脱硝技术(SCR)性能的影响,研究水泥炉窑SNCR-SCR联合脱硝工艺. 依托浙江省某水泥熟料生产线,通过在已配套的SNCR脱硝装置后端引入SCR反应器深化烟气脱硝过程,建立体积流量为10 000 m3/h的SNCR-SCR联合脱硝系统. 结果表明,在烟气体积流量为10 000 m3/h,入口温度为340 °C,入口NOx质量浓度为200~320 mg/m3的条件下,选择NSR为0.85~1.00、催化剂用量为8.1 m3时,SCR处理系统出口NOx排放质量浓度为23.4 mg/m3,氨排放质量浓度为0.98 mg/m3,SCR系统脱硝率可达90.4 %. 中试实验NOx的排放质量浓度、氨排放质量浓度均远优于《水泥工业大气污染物排放标准》(GB4915—2013)的规定,证明可实现水泥炉窑烟气氮氧化物的超低排放.

关键词: 水泥炉窑烟气脱硝NOxSCRSNCR-SCR    
Abstract:

The effects of flue gas temperature, inlet NOx mass concentration, ammonia-nitrogen ratio (NSR), catalyst loading and ash deposit time on the selective catalytic reduction (SCR) process were analyzed for the removal of nitrogen oxides (NOx) from cement furnace kiln. The characteristics of the SNCR-SCR combined denitrification process in cement furnaces were analyzed. The SNCR-SCR combined denitrification system of 10 000 m3/h was established based on a cement clinker production line in Zhejiang Province to strengthen the flue gas denitrification process by introducing an SCR device at the back end of a supporting SNCR denitrafication device. Results showed that the NOx emission mass concentration and ammonia mass concentration were 23.4 mg/m3 and 0.98 mg/m3 after continuous operation of SCR under 0.85~1.00 NSR, 8.1 m3 catalyst dosage when the flue gas volume was 10 000 m3/h with an inlet NOx mass concentration of 200~320 mg/m3 at 340 °C. The SCR segment denitrafication efficiency can reach 90.4%. These measured NOx emission mass concentration and ammonia escape mass concentration in the pilot test are far superior to those in the “Cement Industry Air Pollutant Emission Standard” (GB4915—2013), which proves that ultra-low emissions of the main pollutants in the flue gas of cement furnace can be realized.

Key words: cement furnace    flue gas denitrification    NOx    SCR    SNCR-SCR
收稿日期: 2020-02-29 出版日期: 2020-10-28
CLC:  X 511  
基金资助: 浙江省科技厅资助项目(2016F50026)
作者简介: 韦彦斐(1969—),男,正高级工程师,博士生,从事非电行业大气污染控制的研究. orcid.org/0000-0002-0955-3467. E-mail: weiyf211@163.com
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引用本文:

韦彦斐,周荣,周敏捷,高翔. 水泥炉窑SNCR-SCR联合脱硝中试实验研究[J]. 浙江大学学报(工学版), 2020, 54(10): 1986-1992.

Yan-fei WEI,Rong ZHOU,Min-jie ZHOU,Xiang GAO. Pilot study on combined denitration of SNCR-SCR system in cement furnace. Journal of ZheJiang University (Engineering Science), 2020, 54(10): 1986-1992.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.10.016        http://www.zjujournals.com/eng/CN/Y2020/V54/I10/1986

图 1  SNCR-SCR工艺流程图
图 2  SCR脱硝中试装置
图 3  温度对SCR脱硝性能的影响
图 4  入口NOx质量浓度波动对脱硝性能的影响
图 5  NSR对脱硝率及氨排放质量浓度的影响
图 6  催化剂装载量对脱硝率的影响
图 7  积灰时间对脱硝性能的影响
图 8  水泥炉窑SCR脱硝168 h性能曲线
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