1000MW双切圆燃烧锅炉干湿态转换过程中水冷壁温度控制
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摘要
针对超超临界双切圆锅炉干湿态转换过程中的水冷壁温度偏差大、超温的问题,采取了三个阶段的控制措施:干湿态转换前,优先投入上层磨煤机运行,提高锅炉压力和给水温度;转态过程中,维持合适的水煤比以及较低的中间点过热度;锅炉正常运行时,尽量提高炉膛火焰中心高度,使炉膛热负荷分布更加均匀,调整一、二次风配风方式,降低"热角"区温度。此外,取消了超温管的节流孔圈,增大质量流速。通过以上调整方法,有效缓解了干湿态转换过程中水冷壁超温问题,改善了水冷壁的运行工况。
Aiming at the problems of water-wall overheating and large temperature deviations of the ultra-supercritical dual tangential circle boiler in the wet-dry transferring period,a three-stage control measure is adopted.Prior to the wet-dry transferring,the upper mills are put into operation to increase the boiler pressure and the feeding water temperature.During the transferring,an appropriate water/coal ratio and a superheating degree are settled and maintained.During the routine operation,the flame height should be kept as high as possible to improve the heat uniformity and the primary and secondary air distributions are adjusted to lower the"hot corner"temperature.In addition,the orifice plates of the overheated water-wall tubes are removed to increase the mass velocity.The results show that this measure has effectively alleviated the overheating of the water-wall and improved the water-wall operation conditions.
Aiming at the problems of water-wall overheating and large temperature deviations of the ultra-supercritical dual tangential circle boiler in the wet-dry transferring period,a three-stage control measure is adopted.Prior to the wet-dry transferring,the upper mills are put into operation to increase the boiler pressure and the feeding water temperature.During the transferring,an appropriate water/coal ratio and a superheating degree are settled and maintained.During the routine operation,the flame height should be kept as high as possible to improve the heat uniformity and the primary and secondary air distributions are adjusted to lower the"hot corner"temperature.In addition,the orifice plates of the overheated water-wall tubes are removed to increase the mass velocity.The results show that this measure has effectively alleviated the overheating of the water-wall and improved the water-wall operation conditions.
引文
[1]乌若思.超超临界发电研究与应用[J].中国电力,2006,39(6):34-37.WU Ruosi.Research and application of ultra supercritical power generation technology in China[J].Electric Power,2006,39(6):34-37.
[2]王宝华.超超临界直流锅炉垂直上升管圈水动力特性探讨[J].锅炉技术,2008,39(5):5-8.WANG Baohua.Investigation on the vertical upward water wall hydrodynamic behavior of a 1 000 MW ultra-supercritical oncethrough boiler[J].Boiler Technology,2008,39(5):5-8.
[3]叶江明.锅炉原理[M].北京:中国电力出版社,2010.
[4]崔鹏.超超临界锅炉垂直管屏水冷壁流动特性研究[D].保定:华北电力大学,2009.
[5]车东光,吴少华.超超临界锅炉水冷壁传热特性和温度偏差[J].锅炉制造,2006(2):2-5.CHE Dongguang,WU Shaohua.The heat transfer characteristic and temperature deviation of supercritical boiler water wall[J].Boiler Manufacturing,2006(2):2-5.
[6]樊泉桂.超临界锅炉水冷壁工质温度的控制[J].动力工程,2006,26(1):39-41.FAN Quangui.Control of working medium’s temperature within water walls of supercritical boilers[J].Journal of Power Engineering,2006,26(1):39-41.
[7]左帅,张峰,周波.1 000 MW超超临界锅炉机组冷态启动时水冷壁超温的探讨[J].中国电力,2011,44(5):60-63.ZUO Shuai,ZHANG Feng,ZHOU Bo.Over-temperature problem of water-wall in 1 000 MW ultra-supercritical boiler during cold startup[J].Electric Power,2011,44(5):60-63.
[8]郑建学,陈听宽,吴履琛,等.高压汽水两相流内螺纹管壁温与临界热负荷特性的研究[J].西安交通大学学报,1995,29(5):64-68.ZHENG Jianxue,CHEN Tingkuan,WU Lvchen,et al.Investigation on the tube wall temperature and critical heat flux for high pressure steam-water two-phase flow in internally ribbed tubes[J].Journal of Xi’an Jiaotong University,1995,29(5):64-68.
[9]汪华剑,周虹光,王洋,等.1 000 MW垂直管圈超超临界锅炉水冷壁工质相变转换对金属壁温影响的试验研究[J].锅炉技术,2017,48(6):13-18.WANG Huajian,ZHOU Hongguang,WANG Yang,et al.Experimental study on influence of working medium phase change on mental temperature of water wall tube in a 1 000 MW ultra supercritical vertical water wall boiler[J].Boiler Technology,2017,48(6):13-18.
[10]刘建全,孙保民,胡永生,等.某1 000 MW超超临界双切圆锅炉燃烧特性的数值模拟与优化[J].中国电机工程学报,2012,32(20):35-40.LIU Jianquan,SUN Baomin,HU Yongsheng,et al.Numerical simulation and optimization on combustion of a 1 000 MW ultra supercritical dual tangential circle boiler[J].Proceedings of the CSEE,2012,32(20):35-40.
[11]王运民,周永强,明勇.电厂锅炉制粉系统优化调整试验[J].中国电力,2011,44(3):34-38.WANG Yunmin,ZHOU Yongqiang,MING Yong.Optimized adjustment experiments on pulverizing system in power plant[J].Electric Power,2011,44(3):34-38.
[2]王宝华.超超临界直流锅炉垂直上升管圈水动力特性探讨[J].锅炉技术,2008,39(5):5-8.WANG Baohua.Investigation on the vertical upward water wall hydrodynamic behavior of a 1 000 MW ultra-supercritical oncethrough boiler[J].Boiler Technology,2008,39(5):5-8.
[3]叶江明.锅炉原理[M].北京:中国电力出版社,2010.
[4]崔鹏.超超临界锅炉垂直管屏水冷壁流动特性研究[D].保定:华北电力大学,2009.
[5]车东光,吴少华.超超临界锅炉水冷壁传热特性和温度偏差[J].锅炉制造,2006(2):2-5.CHE Dongguang,WU Shaohua.The heat transfer characteristic and temperature deviation of supercritical boiler water wall[J].Boiler Manufacturing,2006(2):2-5.
[6]樊泉桂.超临界锅炉水冷壁工质温度的控制[J].动力工程,2006,26(1):39-41.FAN Quangui.Control of working medium’s temperature within water walls of supercritical boilers[J].Journal of Power Engineering,2006,26(1):39-41.
[7]左帅,张峰,周波.1 000 MW超超临界锅炉机组冷态启动时水冷壁超温的探讨[J].中国电力,2011,44(5):60-63.ZUO Shuai,ZHANG Feng,ZHOU Bo.Over-temperature problem of water-wall in 1 000 MW ultra-supercritical boiler during cold startup[J].Electric Power,2011,44(5):60-63.
[8]郑建学,陈听宽,吴履琛,等.高压汽水两相流内螺纹管壁温与临界热负荷特性的研究[J].西安交通大学学报,1995,29(5):64-68.ZHENG Jianxue,CHEN Tingkuan,WU Lvchen,et al.Investigation on the tube wall temperature and critical heat flux for high pressure steam-water two-phase flow in internally ribbed tubes[J].Journal of Xi’an Jiaotong University,1995,29(5):64-68.
[9]汪华剑,周虹光,王洋,等.1 000 MW垂直管圈超超临界锅炉水冷壁工质相变转换对金属壁温影响的试验研究[J].锅炉技术,2017,48(6):13-18.WANG Huajian,ZHOU Hongguang,WANG Yang,et al.Experimental study on influence of working medium phase change on mental temperature of water wall tube in a 1 000 MW ultra supercritical vertical water wall boiler[J].Boiler Technology,2017,48(6):13-18.
[10]刘建全,孙保民,胡永生,等.某1 000 MW超超临界双切圆锅炉燃烧特性的数值模拟与优化[J].中国电机工程学报,2012,32(20):35-40.LIU Jianquan,SUN Baomin,HU Yongsheng,et al.Numerical simulation and optimization on combustion of a 1 000 MW ultra supercritical dual tangential circle boiler[J].Proceedings of the CSEE,2012,32(20):35-40.
[11]王运民,周永强,明勇.电厂锅炉制粉系统优化调整试验[J].中国电力,2011,44(3):34-38.WANG Yunmin,ZHOU Yongqiang,MING Yong.Optimized adjustment experiments on pulverizing system in power plant[J].Electric Power,2011,44(3):34-38.