| Mechanical and Energy Engineering |
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| Evaluation on operation state and stability for denitrification of ultra low emission |
| LI Qing yi, MENG Wei, WU Guo chao, ZHANG Jun, ZHU Song qiang, HU Da qing,ZHENG Cheng hang, GAO Xiang,WANG Ru neng, LIU Hai jiao |
1. Zhejiang Tiandi Environmental Protection Technology Co. Ltd,Hangzhou 310003, China;
2. Zhejiang Provincial Energy Group Co. Ltd, Hangzhou 310007, China;
3. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China |
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Abstract The evaluation system for the performance of denitrification device was established by taking the 1 000 MW coal-fired unit after ultra low emission transformation as an example. The operation, reliability and stability of denitrification device was evaluated in detail. Results show that the qualified rates of selective catalytic reduction (SCR) inlet NOx concentration, SCR outlet NOx concentration, denitrification efficiency, ammonia escape and pressure loss are 90.45%, 92.34%, 78.98%, 92.34% and 100.00%, respectively, while the corresponding evaluation standards are 300 mg/m3、50 mg/m3、85%、3×10-6 and 600 Pa, respectively. Substandard working conditions occurs at the operation state of variable and low load. The main reasons are that the response rate of spray ammonia signal is too slow, that the oxygen content in the furnace is difficult to control and that the SCR inlet temperature is too also low. The average NOx concentration at SCR outlet after reformation decreases significantly, even lower than 30 mg/m3. The NOx concentration at the outlet of the chimney is stable and reliable with the qualified rate of 98.74%, which is even higher than the designed value．
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Published: 08 December 2016
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Cite this article:
LI Qing yi, MENG Wei, WU Guo chao, ZHANG Jun, ZHU Song qiang, HU Da qing,ZHENG Cheng hang, GAO Xiang,WANG Ru neng, LIU Hai jiao. Evaluation on operation state and stability for denitrification of ultra low emission. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(12): 2303-2311.
URL:
http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.12.009 OR http://www.zjujournals.com/eng/Y2016/V50/I12/2303
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超低排放脱硝运行状态及稳定性评估
以超低排放改造后的某1 000 MW燃煤机组为例,建立该机组脱硝装置的性能评估体系,对脱硝装置的运行状态、可靠性和稳定性进行评估.得到的结论如下：按照该机组选择性催化还原(SCR)入口NOx浓度、SCR出口NOx浓度、脱硝效率、氨逃逸和压力损失分别为300 mg/m3、50 mg/m3、85%、3×10-6 和600 Pa的评估标准,对应的达标率分别为90.45%、92.34%、78.98%、98.32%和100.00%|不达标状态一般出现在机组变负荷和低负荷运行状态下,主要是喷氨量信号的响应速度过慢、炉膛内氧量难以控制和SCR入口温度较低等原因所致|超低排放改造后的机组SCR出口NOx平均浓度明显降低,小于30 mg/m3,改造效果显著|机组总排口NOx排放浓度稳定可靠,达标率为98.74%,高于超低排放设计目标．
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