SCR超低排放综合诊断及闭环优化

doi:10.11930/j.issn.1004-9649.201808126

中国电力 ›› 2019, Vol. 52 ›› Issue (3): 153-160.DOI: 10.11930/j.issn.1004-9649.201808126

SCR超低排放综合诊断及闭环优化

杨希刚^1,2,3, 金保昇¹, 许月阳^1,2,3

1. 东南大学, 江苏南京 210096;
2. 国电科学技术研究院有限公司, 江苏南京 210023;
3. 清洁高效燃煤发电与污染控制国家重点实验室, 江苏南京 210023

收稿日期:2018-08-22 修回日期:2018-10-31 出版日期:2019-03-05 发布日期:2019-03-27
通讯作者: 许月阳(1979-),男,通信作者,硕士,高级工程师(研究员级),从事电力科技与环境保护研究,E-mail:xyy_gdhb@126.com
作者简介:杨希刚(1975-),男,硕士,高级工程师,从事电力工程与环境保护研究,E-mail:yxigang@163.com
基金资助:
国家重点研发计划资助项目（燃煤电站多污染物协同控制与资源化技术及装备，2017YFC0210200）。

Comprehensive Diagnosis and Closed Loop Optimization of NO_x Ultra-Low Emission of SCR

YANG Xigang^1,2,3, JIN Baosheng¹, XU Yueyang^1,2,3

1. Southeast University, Nanjing 210096, China;
2. Guo Dian Science and Technology Research Institute; Nanjing 210023, China;
3. State Key Laboratory of Clean and Efficient Coal-Fired Power Generation and Pollution Control, Nanjing 210023, China

Received:2018-08-22 Revised:2018-10-31 Online:2019-03-05 Published:2019-03-27

摘要/Abstract

摘要： 针对燃煤电厂烟气脱硝系统存在的流场不均、氨逃逸导致空气预热器堵塞以及NO_x排放不能在全负荷段稳定达标等典型问题，提出了SCR超低排放综合诊断及闭环优化策略。结合某630 MW机组实施超低排放改造具体案例，以在线大数据和性能检测为基础，数值模拟和系统诊断为手段，通过模拟评估及试验分析进行预判，提出改进方案并予以优化、修正和实施，最后结合性能试验对超低排放改造实施效果进行验证。研究结果表明，采用多元手段进行SCR系统综合诊断和闭环优化，NO_x浓度场标准偏差从18.6%下降至4.89%，脱硝效率从86.7%提高至89%以上，NO_x排放质量浓度稳定低于50 mg/m³，SCR系统出口氨逃逸质量浓度从16 mg/m³下降至0.75 mg/m³，超低排放改造效果显著。

关键词: 燃煤电厂, 烟气脱硝, 超低排放改造, 综合诊断, 闭环优化

Abstract: In view of the typical problems in the flue gas denitration system, such as poor flow uniformity, ammonia escape, air pre-heater clogging, failure of NO_x stable ultra-low emission in full load section, a comprehensive diagnosis and closed-loop optimization strategy for ultra-low emission of SCR is proposed. Combining with the 630 MW implementation case, with the online large data and performance testing as the base, numerical simulation and system diagnosis as the means, by means of simulation evaluation and test analysis, the improvement scheme is put forward, optimized, revised and implemented, and finally combined with the performance test to verify the effect. The comprehensive diagnosis and closed-loop optimization of the SCR system are performed with multiple means. Comparing before and after modification, the standard deviation of NO_x concentration field decreases from 18.6% to 4.89%, the denitration efficiency increases from 86.7% to over 89%, and the chimney NO_x emission concentration is steadily below 50 mg/m³, the ammonia escaping mass concentration at the outlet of the SCR system decreases from 16 mg/m³ to 0.75 mg/m³. The effect of ultra-low emission reconstruction is remarkable.

Key words: coal-fired power plant, flue gas denitrification, ultra-low emission reformation, comprehensive diagnosis, closed loop optimization

中图分类号:

X703
TM621.9

杨希刚, 金保昇, 许月阳. SCR超低排放综合诊断及闭环优化[J]. 中国电力, 2019, 52(3): 153-160.

YANG Xigang, JIN Baosheng, XU Yueyang. Comprehensive Diagnosis and Closed Loop Optimization of NO_x Ultra-Low Emission of SCR[J]. Electric Power, 2019, 52(3): 153-160.

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https://www.electricpower.com.cn/CN/Y2019/V52/I3/153

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SCR超低排放综合诊断及闭环优化

Comprehensive Diagnosis and Closed Loop Optimization of NO_x Ultra-Low Emission of SCR

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SCR超低排放综合诊断及闭环优化

Comprehensive Diagnosis and Closed Loop Optimization of NOx Ultra-Low Emission of SCR

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Comprehensive Diagnosis and Closed Loop Optimization of NO_x Ultra-Low Emission of SCR