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浙江大学学报(工学版)
浙江大学学报(工学版)
机械与能源工程     
MMT添加剂解决CO对SNCR的抑制作用
周昊, 时伟, 朱国栋
浙江大学 能源清洁利用国家重点实验室,浙江 杭州 310027
Solve CO inhibition of SNCR reaction by additive MMT
 ZHOU Hao, SHI Wei, ZHU Guo dong
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：
通过实验研究MMT和CO添加剂对SNCR反应的影响,着重研究MMT和CO在协同作用下对SNCR脱硝效率和CO排放浓度的影响,通过实验数据分析MMT添加剂在SNCR体系中的反应机理.结果表明：喷入模拟烟气中MMT添加剂的最佳质量浓度为40 mg/L,将此质量浓度的MMT添加到以尿素为还原剂的SNCR反应体系中,可以使反应温度窗口拓宽约30 ℃,最佳反应温度为900 ℃,对应的脱硝效率得到提高；CO的存在会使SNCR反应窗口向低温区移动,反应窗口宽度变窄,最大脱硝效率降低,且CO浓度越高,变化越明显.当模拟烟气中CO的体积分数从0增加到800 μL/L时,NO脱除率从83%下降到75%,最佳脱除温度从950 ℃下降至800 ℃；在存在CO的SNCR体系中,MMT添加剂不仅可以提高低温区SNCR反应的脱硝效率,而且能够在高温区抵减CO对SNCR脱硝的抑制作用,扩宽脱硝温度窗口宽度至240 ℃,在反应窗口内提高脱硝效率,使得最大NO脱除率在CO体积分数为0μL/L时从83%增大至89%；在CO体积分数为200 μL/L时,最大NO脱除率从80%增大至85%；在CO体积分数为500 μL/L时,最大NO脱除率从79%增大至85%；在CO体积分数为800 μL/L时,最大NO脱除率从75%增大至83%.
Abstract:
The effect of additive MMT and CO on selective non catalytic reduction (SNCR) were studied by experiment. The influences of MMT and CO synergy on SNCR NOx removal efficiency and CO emission concentration were mainly investigated. The reaction mechanism of additive MMT in SNCR system was also analyzed based on the experimental data. Results show that the optimum mass fraction of additive MMT is 40 mg/L. The reaction temperature region can be widened about 30 ℃ by adding MMT of 40 mg/L to SNCR reaction system where the urea acts as reducing agent. The optimum reaction temperature is 900 ℃ and the NOx removal efficiency is also increased. Adding CO can lower the SNCR reaction temperature, narrow the temperature region and reduce the maximum NOx removal efficiency. The higher the CO volume fraction is, the more obvious the changes will be. When the volume fraction of CO in simulated flue gas is increased from 0 to 800 μL/L, the NOx removal efficiency decreases from 83% to 75% and the optimal removal temperature decreases from 950 ℃ to 800 ℃. In a SNCR system with existence of CO, additive MMT can not only improve the SNCR NOx removal efficiency in low temperature region, but also offset the CO inhibition on the SNCR NOx removal in the high temperature zone. Additive MMT can expand the width of NOx removal temperature region to 240 ℃ and increase the NOx removal efficiency. The maximum NOx removal efficiency increases from 83% to 89% when the volume fraction of CO is 0, from 80% to 85% when that is 200 μL/L, from 79% to 85% when that is 500 μL/L and from 75% to 83% when that is 800 μL/L.
出版日期: 2015-12-31
:  TK 16  
基金资助:

浙江省自然科学基金资助项目(LZ12E06002)
作者简介: 周昊( 1973—),男,教授,从事煤的低污染优化燃烧研究. ORCID: 0000 0001 9779 7703. E-mail: zhouhao@cmee.zju.edu.cn
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周昊, 时伟, 朱国栋. MMT添加剂解决CO对SNCR的抑制作用[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2015.12.001.

ZHOU Hao, SHI Wei, ZHU Guo dong. Solve CO inhibition of SNCR reaction by additive MMT. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2015.12.001.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2015.12.001    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I12/2237

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