对冲旋流燃烧锅炉组合式贴壁风运行参数优化的数值模拟
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摘要
以某600 MW超临界对冲旋流燃烧锅炉组合式贴壁风系统为研究对象,采用数值模拟方法分析了贴壁风取风方式、风率和喷口风速等运行参数对水冷壁近壁区烟气中氧体积分数、锅炉NO_x排放质量浓度和未燃尽碳质量分数的影响。结果表明:组合式贴壁风可以显著改善对冲旋流燃烧锅炉左右两侧墙水冷壁近壁区气氛,高温腐蚀发生倾向性较大区域所占比例可减小至20%以下;综合考虑机组运行的经济性、环保性和安全性,模拟所得机组的最佳运行工况选取贴壁风风率为4.00%,前后墙贴壁风喷口风速为20 m/s,贴壁风的取风方式为从燃尽风取风。
Taking the combined closing-to-wall air system in a 600 MW supercritical opposed firing boiler as an object of study, numerical simulations were conducted to investigate the effects of closing-to-wall air intake mode, air rate and air velocity on the oxygen concentration in the flue gas close to the water wall, the boiler NO_x emission and the unburned carbon content, etc. Results show that the reductive atmosphere around both the right and the left side wall could be effectively improved by adopting the combined closing-to-wall air system, in which case, the proportion of the area with strong tendency to form high-temperature corrosion could be reduced to be less than 20%. Considering the economic, environmental and safety operation of the unit, the simulated optimal operation conditions are as follows: the closing-to-wall air rate is 4.00%, the nozzle velocity on front and rear wall is 20 m/s, while the closing-to-wall air is taken from the overfire air system.
Taking the combined closing-to-wall air system in a 600 MW supercritical opposed firing boiler as an object of study, numerical simulations were conducted to investigate the effects of closing-to-wall air intake mode, air rate and air velocity on the oxygen concentration in the flue gas close to the water wall, the boiler NO_x emission and the unburned carbon content, etc. Results show that the reductive atmosphere around both the right and the left side wall could be effectively improved by adopting the combined closing-to-wall air system, in which case, the proportion of the area with strong tendency to form high-temperature corrosion could be reduced to be less than 20%. Considering the economic, environmental and safety operation of the unit, the simulated optimal operation conditions are as follows: the closing-to-wall air rate is 4.00%, the nozzle velocity on front and rear wall is 20 m/s, while the closing-to-wall air is taken from the overfire air system.
引文
[1] 李永生,刘建民,陈国庆,等.对冲旋流燃烧锅炉侧墙水冷壁近壁区还原性气氛分布特性[J].动力工程学报,2017,37(7):513-519,539.LI Yongsheng,LIU Jianmin,CHEN Guoqing,et al.Distribution characteristics of reductive atmosphere close to the water wall of an opposed firing boiler[J].Journal of Chinese Society of Power Engineering,2017,37(7):513-519,539.
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[7] 李敏,丘纪华,向军,等.锅炉水冷壁高温腐蚀运行工况的防腐模拟[J].中国电机工程学报,2002,22(7):150-154.LI Min,QIU Jihua,XIANG Jun,et al.An anti-corrosion simulation for the high temperature corrosion on boiler water-wall during different operation[J].Proceedings of the CSEE,2002,22(7):150-154.
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[9] 杜智华,蒙毅,孙军.530 MW超临界机组对冲燃烧锅炉低氮燃烧贴壁风系统数值计算[J].动力工程学报,2017,37(6):425-431.DU Zhihua,MENG Yi,SUN Jun.Numerical analysis on low NOx combustion near-wall air distribution system of an opposed firing boiler for 530 MW supercritical units[J].Journal of Chinese Society of Power Engineering,2017,37(6):425-431.
[10] 梁学斌,孙军,蒙毅,等.非对称高速贴壁风系统在530 MW俄制机组上的应用[J].热力发电,2017,46(3):87-92.LIANG Xuebin,SUN Jun,MENG Yi,et al.Application of non-symmetrical high-speed closing-to-wall air system to a Russian-made 530 MW unit coal fired boiler[J].Thermal Power Generation,2017,46(3):87-92.
[11] 王通,宋纯龙,韩升利,等.贴壁风缓解和解决锅炉炉内高温腐蚀[J].锅炉制造,2018(1):13-20.WANG Tong,SONG Chunlong,HAN Shengli,et al.Wall-air is the method of easing and solving boiler high temperature corrosion[J].Boiler Manufacturing,2018(1):13-20.
[12] 关键,陈锡炯,项群扬,等.配风方式及贴壁风对锅炉贴壁气氛影响规律研究[J].电站系统工程,2017,33(3):21-23,26.GUAN Jian,CHEN Xijiong,XIANG Qunyang,et al.Effect of air distribution and near-wall air on near water-wall flue gas atmosphere distribution for coal firing boiler[J].Power System Engineering,2017,33(3):21-23,26.
[13] 孟凡冉,高畅,金保昇,等.异距贴壁风喷口布置方案的数值模拟[J].化工进展,2017,36(9):3237-3242.MENG Fanran,GAO Chang,JIN Baosheng,et al.Numerical simulation of near-wall air scheme combined with different jet position[J].Chemical Industry and Engineering Progress,2017,36(9):3237-3242.
[14] 陈天杰,姚露,刘建民,等.某660 MW前后墙对冲燃煤锅炉贴壁风优化方案的数值模拟[J].中国电机工程学报,2015,35(20):5265-5271.CHEN Tianjie,YAO Lu,LIU Jianmin,et al.Numerical simulation on the optimization of closing-to-wall air in a 660 MW front and rear wall opposed coal-fired boiler[J].Proceedings of the CSEE,2015,35(20):5265-5271.
[15] 李文学,蔡培,张春辉,等.600 MW对冲旋流燃烧锅炉侧墙缝隙式贴壁风系统工业试验[J].锅炉技术,2018,49(4):46-51.LI Wenxue,CAI Pei,ZHANG Chunhui,et al.Industrial Experiment on the side wall slot closing-to-wall air system in a 600 MW supercritical opposite firing boiler[J].Boiler Technology,2018,49(4):46-51.
[2] 徐国群,陈国庆.对冲旋流燃烧锅炉炉膛壁面氛围数值模拟分析[J].电力科技与环保,2017,33(6):44-48.XU Guoqun,CHEN Guoqing.Numerical simulation analysis of wall atmosphere in front and rear wall opposed coal-fire boiler[J].Electric Power Technology and Environmental Protection,2017,33(6):44-48.
[3] SHA Long,LIU Hui,XU Lianfei,et al.Research on the elliptic aerodynamic field in a 1 000 MW dual circle tangential firing single furnace ultra supercritical boiler[J].Energy,2012,46(1):364-373.
[4] 党林贵,陈国喜,王春玉,等.前后墙对冲旋流燃烧锅炉炉膛结渣试验研究和改造实践[J].动力工程学报,2015,35(10):781-785.DANG Lingui,CHEN Guoxi,WANG Chunyu,et al.Experimental study on slagging mechanism in an opposite firing boiler and the countermeasures[J].Journal of Chinese Society of Power Engineering,2015,35(10):781-785.
[5] 邓中乙,余有生,谢红,等.二次风偏转对减轻超超临界墙式锅炉高温腐蚀数值模拟[J].中国电力,2015,48(1):47-51.DENG Zhongyi,YU Yousheng,XIE Hong,et al.Numerical simulation of high temperature corrosion reduction by deflected secondary air in a tangentially fired ultra supercritical boiler[J].Electric Power,2015,48(1):47-51.
[6] 张知翔,成丁南,王云刚,等.新型贴壁风装置的结构设计及优化模拟[J].动力工程学报,2011,31(2):79-84,102.ZHANG Zhixiang,CHENG Dingnan,WANG Yungang,et al.Structure design and optimizing simulation of a new type closing-to-wall air device[J].Journal of Chinese Society of Power Engineering,2011,31(2):79-84,102.
[7] 李敏,丘纪华,向军,等.锅炉水冷壁高温腐蚀运行工况的防腐模拟[J].中国电机工程学报,2002,22(7):150-154.LI Min,QIU Jihua,XIANG Jun,et al.An anti-corrosion simulation for the high temperature corrosion on boiler water-wall during different operation[J].Proceedings of the CSEE,2002,22(7):150-154.
[8] 陈敏生,廖晓春.600 MW超临界锅炉防止高温腐蚀技术改造和运行调整[J].中国电力,2014,47(4):56-59,117.CHEN Minsheng,LIAO Xiaochun.The retrofit of high-temperature corrosion prevention and operation adjustment for 600-MW supercritical boiler[J].Electric Power,2014,47(4):56-59,117.
[9] 杜智华,蒙毅,孙军.530 MW超临界机组对冲燃烧锅炉低氮燃烧贴壁风系统数值计算[J].动力工程学报,2017,37(6):425-431.DU Zhihua,MENG Yi,SUN Jun.Numerical analysis on low NOx combustion near-wall air distribution system of an opposed firing boiler for 530 MW supercritical units[J].Journal of Chinese Society of Power Engineering,2017,37(6):425-431.
[10] 梁学斌,孙军,蒙毅,等.非对称高速贴壁风系统在530 MW俄制机组上的应用[J].热力发电,2017,46(3):87-92.LIANG Xuebin,SUN Jun,MENG Yi,et al.Application of non-symmetrical high-speed closing-to-wall air system to a Russian-made 530 MW unit coal fired boiler[J].Thermal Power Generation,2017,46(3):87-92.
[11] 王通,宋纯龙,韩升利,等.贴壁风缓解和解决锅炉炉内高温腐蚀[J].锅炉制造,2018(1):13-20.WANG Tong,SONG Chunlong,HAN Shengli,et al.Wall-air is the method of easing and solving boiler high temperature corrosion[J].Boiler Manufacturing,2018(1):13-20.
[12] 关键,陈锡炯,项群扬,等.配风方式及贴壁风对锅炉贴壁气氛影响规律研究[J].电站系统工程,2017,33(3):21-23,26.GUAN Jian,CHEN Xijiong,XIANG Qunyang,et al.Effect of air distribution and near-wall air on near water-wall flue gas atmosphere distribution for coal firing boiler[J].Power System Engineering,2017,33(3):21-23,26.
[13] 孟凡冉,高畅,金保昇,等.异距贴壁风喷口布置方案的数值模拟[J].化工进展,2017,36(9):3237-3242.MENG Fanran,GAO Chang,JIN Baosheng,et al.Numerical simulation of near-wall air scheme combined with different jet position[J].Chemical Industry and Engineering Progress,2017,36(9):3237-3242.
[14] 陈天杰,姚露,刘建民,等.某660 MW前后墙对冲燃煤锅炉贴壁风优化方案的数值模拟[J].中国电机工程学报,2015,35(20):5265-5271.CHEN Tianjie,YAO Lu,LIU Jianmin,et al.Numerical simulation on the optimization of closing-to-wall air in a 660 MW front and rear wall opposed coal-fired boiler[J].Proceedings of the CSEE,2015,35(20):5265-5271.
[15] 李文学,蔡培,张春辉,等.600 MW对冲旋流燃烧锅炉侧墙缝隙式贴壁风系统工业试验[J].锅炉技术,2018,49(4):46-51.LI Wenxue,CAI Pei,ZHANG Chunhui,et al.Industrial Experiment on the side wall slot closing-to-wall air system in a 600 MW supercritical opposite firing boiler[J].Boiler Technology,2018,49(4):46-51.