洁净煤技术

2020, v.26;No.128(04) 134-139

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富氧低NO_x稳燃技术在300 MW煤粉锅炉机组灵活性调峰中的应用
Application ofoxygen-enriched and low NO_x combustion steady technology during flexibility peak-load regulating of 300 MW pulverized coal boiler unit

陈子曦;王庆;王泉海;雷云红;李建波;贾益;亢银虎;卢啸风;
CHEN Zixi;WANG Qing;WANG Quanhai;LEI Yunhong;LI Jianbo;JIA Yi;KANG Yinhu;LU Xiaofeng;Key Laboratory of Low-grade Fuel Efficient Clean Utilization Technology and System,Chongqing University;Chongqing Furan Technology Co.,Ltd.;

摘要(Abstract):

为了对富氧低NO_x稳燃技术的实际应用效果进行工程示范,针对富氧低NO_x稳燃技术在300 MW亚临界煤粉锅炉上的低负荷稳燃特性进行了实炉试验研究。通过将锅炉A、D层原12台一次风燃烧器改造为富氧低NO_x燃烧器以及对锅炉主要运行参数的测量分析,研究富氧低NO_x稳燃技术对SCR入口的NO_x原始排放浓度、烟气温度,以及对锅炉总体运行特性的影响。实炉试验、日常运行以及第三方完成的性能测试结果表明,原锅炉改造应用富氧低NO_x稳燃技术后,NO_x原始生成量明显降低。改造后的运行实践证明,锅炉最低可在23.5%负荷(70.4 MW)下稳定运行,且同时能保证锅炉出口过热蒸汽参数和再热蒸汽参数达到运行要求、SCR入口烟温维持在280℃以上及NO_x原始生成浓度低于300 mg/Nm3,实现NO_x超低排放。锅炉运行经济性统计分析表明,采用富燃低NO_x稳燃技术后,调峰能力大幅提高,可长期低负荷运行,且可有效投入SCR脱硝系统,锅炉的年平均点火和低负荷稳燃用油量减少了65%。因此富氧低NO_x稳燃技术可实现锅炉的低负荷稳燃及超低排放,且大幅降低锅炉点火及稳燃用油,提高锅炉的经济性。
In order to demonstrate the practical application of oxygen-enriched and low-NOxstable combustion technology,the steady combustion characteristics of oxygen-enriched and low-NOxtechnology on a 300 MW sub-critical pulverized coal-fired boiler under low load were studied.After transforming the original 12 primary air burners at A and D floors of the boiler into oxygen-enriched and low-NOxones,the main operating parameters of the boiler were measured and analyzed.The influence of oxygen-enriched and low-NOx stable combustion technology on original NOxemission concentrations and flue gas temperature at the SCR inlet and the overall operating characteristics of the boiler were studied in detail.The results of field tests,daily operation and performance testing done by third parties show that the original NOxproduction is significantly reduced after the original boiler being modified and applied with oxygen-enriched and low-NOxstable combustion technology.The operation after the transformation proves that the boiler can maintain stable operation at a minimum of 23.5% load( 70.4 MW).At the same time,it can ensure that the superheated and reheated steam parameters at the boiler outlet meet the operating requirements,and the SCR inlet flue gas temperature is maintained above 280 ℃ and the original NOxgeneration concentration is lower than300 mg/Nm3,so as to achieve the ultra-low-NOxemission.The statistical analysis of boiler operation economics shows that the peak shaving capacity is greatly improved after using the oxygen-enriched and low-NOxstable combustion technology,which can make boiler operate for a long time at low load,and can be effectively put into the SCR denitration system. The average annual ignition and low-load stable combustion oil is reduced by 65%.Therefore,the oxygen-enriched and low-NOxstable combustion technology can achieve low-load stable combustion and ultra-low emission of the boiler,and greatly reduce the boiler ignition and stable combustion oil,and improve the economy of boiler.

关键词(KeyWords): 富氧低NOx稳燃技术;低负荷稳燃;超低NOx排放
oxygen-enriched and low-NOx stable combustion technology;low-load stable combustion;ultra-low-NOxemission

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作者(Author): 陈子曦;王庆;王泉海;雷云红;李建波;贾益;亢银虎;卢啸风;
CHEN Zixi;WANG Qing;WANG Quanhai;LEI Yunhong;LI Jianbo;JIA Yi;KANG Yinhu;LU Xiaofeng;Key Laboratory of Low-grade Fuel Efficient Clean Utilization Technology and System,Chongqing University;Chongqing Furan Technology Co.,Ltd.;

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DOI: 10.13226/j.issn.1006-6772.19042601

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