Pilot study on combined denitration of SNCR-SCR system in cement furnace

doi:10.3785/j.issn.1008-973X.2020.10.016

Journal of ZheJiang University (Engineering Science)

2020, Vol. 54

Issue (10): 1986-1992 DOI: 10.3785/j.issn.1008-973X.2020.10.016

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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Abstract

The effects of flue gas temperature, inlet NO_x 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 (NO_x) 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 NO_x 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 NO_x mass concentration of 200~320 mg/m³ at 340 °C. The SCR segment denitrafication efficiency can reach 90.4%. These measured NO_x 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 NO_x SCR SNCR-SCR

Received: 29 February 2020 Published: 28 October 2020

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Cite this article:

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.

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

水泥炉窑SNCR-SCR联合脱硝中试实验研究

以水泥炉窑氮氧化物（NO_x）脱除为研究对象，分析烟气温度、入口NO_x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NO_x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NO_x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NO_x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, NO_x, SCR, SNCR-SCR

Fig.1 Flow chart of SNCR-SCR

Fig.2 Denitration pilot plant of SCR

Fig.3 Effect of temperature on SCR denitration performance

Fig.4 Effect of inlet NO_x concentration fluctuation on denitrification performance

Fig.5 Effect of NSR on denitrification rate and NH₃ slip mass concentration

Fig.6 Effect of catalyst loading on denitration rate

Fig.7 Effect of ash accumulation time on denitration performance

Fig.8 Performance curve of SCR denitration for 168 h in cement furnace


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