冷烟气再循环对锅炉深度调峰能力影响
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摘要
某电厂5号锅炉为670 t/h超高压自然循环锅炉,为提高机组深度调峰能力,安装冷烟气再循环系统,以满足机组深度调峰期间锅炉运行安全经济、环保排放合格。经过对一次冷烟气再循环量、二次冷烟气再循环量的调整优化,机组最低负荷由50%降至34%额定负荷,选择性催化还原(SCR)系统入口烟温达到316℃,再热蒸汽温度为519℃,一次冷烟气再循环量为2.0×10~4 m~3/h,二次冷烟气再循环量为2.5×10~4 m~3/h,机组运行稳定,SCR系统工作正常,深度调峰能力大幅度提高。
The No. 5 boiler in a power plant is a 670 t/h ultra high pressure natural circulation boiler. In order to improve the depth peak-load regulation capacity of the unit, cold flue gas recirculation system was installed to meet the environmental protection emission standard and run in safety and economic state. Through adjustment and optimization on flow rate of the primary cold gas recirculation and the secondary cold flue gas, the minimum stable load of the unit was reduced from 50% to 34% of the rated load, the flue gas temperature at the SCR denitration system inlet was 316 ℃, the reheat steam temperature reached 519 ℃, the flow rate of the primary cold gas recirculation was 2.0×10~4 m~3/h, and the flow rate of the secondary cold flue gas was 2.5×10~4 m~3/h.Therefore, the unit ran stably, the SCR denitration system worked normally, and the depth peak-load regulation capacity of the unit was improved dramatically.
The No. 5 boiler in a power plant is a 670 t/h ultra high pressure natural circulation boiler. In order to improve the depth peak-load regulation capacity of the unit, cold flue gas recirculation system was installed to meet the environmental protection emission standard and run in safety and economic state. Through adjustment and optimization on flow rate of the primary cold gas recirculation and the secondary cold flue gas, the minimum stable load of the unit was reduced from 50% to 34% of the rated load, the flue gas temperature at the SCR denitration system inlet was 316 ℃, the reheat steam temperature reached 519 ℃, the flow rate of the primary cold gas recirculation was 2.0×10~4 m~3/h, and the flow rate of the secondary cold flue gas was 2.5×10~4 m~3/h.Therefore, the unit ran stably, the SCR denitration system worked normally, and the depth peak-load regulation capacity of the unit was improved dramatically.
引文
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[2]马金凤,吴景兴,邹天舒,等.中储式制粉系统锅炉掺烧褐煤技术的研究[J].动力工程,2008,28(1):14-18.MA Jinfeng,WU Jingxing,ZOU Tianshu,et al.Study on lignite-blended Burning technology in the bin and feedercoal pulverizing system[J].Power Engineering,2008,28(1):14-18.
[3]陈宝康,陈敏,王小华,等.350 MW机组燃用烟煤锅炉掺烧褐煤的试验研究[J].热力发电,2013,42(6):35-39.CHEN Baokang,CHEN Min,WANG Xiaohua,et al.Experimental study on lignite and bituminous coal co-combustion in a bituminous coal fired 350 MW unit boiler[J].Thermal Power Generation,2013,42(6):35-39.
[4]王曦宏.采用烟气再循环降低NOx排放方法的研究[J].石油化工设备技术,2017,38(3):26-32.WANG Xihong.Study on reducing NOx emission by using flue gas reflux method[J].Petro-chemical Equipment Technology,2017,38(3):26-32.
[5]赵志丹,郝德锋,王海涛,等.二次再热超超临界机组再热蒸汽温度控制策略[J].热力发电,2015,44(12):113-118.ZHAO Zhidan,HAO Defeng,WANG Haitao,et al.Double reheat ultra-supercritical unit reheat steam temperature control[J].Thermal Power Generation,2015,44(12):113-118.
[6]李传胜.二次再热塔式锅炉再热蒸汽调温方式工程应用[J].热力发电,2016,45(8):68-74.LI Chuansheng.Engineering application of reheat steam temperature control mode for double-reheat tower boilers[J].Thermal Power Generation,2016,45(8):68-74.
[7]邢振中,冷杰,张永兴,等.火力发电机组深度调峰研究[J].东北电力技术,2014,35(4):18-23.XING Zhenzhong,LENG Jie,ZHANG Yongxing,et al.Research on depth peak-load cycling of thermal power units[J].Northeast Electric Power Technology,2014,35(4):18-23.
[8]董信光,孙健,孔庆雨,等.超临界350 MW机组直流锅炉深度调峰能力试验[J].热力发电,2018,47(7):105-112.DONG Xinguang.SUN Jian,KONG Qingyu,et al.Experimental study on depth peak-load regulation capacity of once-through boiler for a supercritical350 MW unit[J].Thermal Power Generation,2018,47(7):105-112.
[9]李一博,芮小博,刘圆圆,等.一种火焰燃烧稳定性自动监测方法:201210592575.8[P].2015-10-14.LI Yibo,RUI Xiaobo,LIU Yuanyuan,et al.An automatic monitoring method for flame combustion stability:201210592575.8[P].2015-10-14.
[10]王东风,刘千,赵文杰,等.基于炉膛参数场测量的电站锅炉燃烧稳定性和经济性状态模糊综合评判[J].动力工程学报,2015,35(6):437-444.WANG Dongfeng,LIU Qian,ZHAO Wenjie,et al.Fuzzy comprehensive evaluation on combustion stability and economy of a power plant boiler based on furnace parameters measurement[J].Journal of Chinese Society of Power Engineering,2015,35(6):437-444.
[11]王华,孙辉,王仕博,等.一种表征和诊断燃烧不稳定性的方法:200910218387.7[P].2011-05-08.WANG Hua,SUN Hui,WANG Shibo,et al.A method of characterizing and diagnosing combustion instabilities:200910218387.7[P].2011-05-08.
[12]张广才,周科,柳宏刚,等.某超临界600 MW机组直流锅炉深度调峰实践[J].热力发电,2018,47(5):83-88.ZHANG Guangcai,ZHOU Ke,LIU Honggang,et al.Practice of deep peak load regulation for a 600 MWsupercritical concurrent boiler[J].Thermal Power Generation,2018,47(5):83-88.
[13]张广才,周科,鲁芬,等.燃煤机组深度调峰技术探讨[J].热力发电,2017,46(9):17-23.ZHANG Guangcai,ZHOU Ke,LU Fen,et al.Discussions on deep peaking technology of coal-fired power plant[J].Thermal Power Generation,2017,46(9):17-23.
[14]齐建军,廉俊芳,赵志宏.600 MW火电机组深度调峰能力探讨与经济安全性分析[J].内蒙古电力技术,2013,31(4):51-53.QI Jianjun,LIAN Junfang,ZHAO Zhihong.Research on peak-load regulation of 600 MW thermal power units and its economic security analysis[J].Inner Mongolia Electric Power,2013,31(4):51-53.
[15]方庆艳,汪华剑,陈刚,等.超超临界锅炉磨煤机组合运行方式优化数值模拟[J].中国电机工程学报,2011,31(5):1-6.FANG Qingyan,WANG Huajian,CHEN Gang,et al.Optimal simulation on the combination mode of mills for ultra-supercritical utility boiler[J].Proceedings of the CSEE,2011,31(5):1-6.
[16]梁立刚,孟勇,吴生来.1 025 t/h锅炉改造后运行优化及NOx排放特性试验研究[J].热力发电,2013,42(1):63-66.LIANG Ligang,MENG Yong,WU Shenglai.Operation optimization for retrofitted 1 025 t/h boiler and experimental study on its NOx emission[J].Thermal Power Generation,2013,42(1):63-66.