高参数超超临界二次再热机组锅炉垂直管圈水冷壁水动力特性分析
|
摘要
相对于常规电站锅炉,高参数超超临界二次再热机组锅炉具有炉内热负荷分布复杂、水冷壁工质温度水平较高、工质大比热容区吸热能力下降等特点,这对锅炉水动力的设计提出了更高的要求。对此,本文以华能安源发电有限责任公司超超临界660 MW二次再热机组锅炉为例,通过数值模拟和水动力建模计算相结合的方法,对超超临界二次再热机组锅炉垂直管圈水冷壁的水动力特性进行了详细计算和分析,获得了相应的流量分配规律以及汽温和壁温分布特点。结果显示:BMCR工况下,下炉膛和上炉膛水冷壁均存在流量偏差和壁温偏差,整体呈负流量响应特性;每面墙水冷壁内流量呈两端高、中间低分布;汽温和壁温分布则为中间高、两端低。本文研究成果可以为高参数超超临界二次再热机组锅炉垂直管圈水冷壁的水动力设计和优化提供参考。
Compared with the conventional utility boiler,the ultra-supercritical double reheat boiler has different characteristics,like more complex heat load distribution in the furnace,higher working fluid temperature,lower heat absorbing capacity of water in the large specific heat region,and so on.It means the design of thermal hydrodynamic is more difficult in the vertically-upward water wall of ultra-supercritical double reheat boiler.Taking the ultra-supercritical 660 MW double reheat boiler in Anyuan Power Plant as an example,the thermal hydrodynamic performance of the vertically-upward water wall of ultra-supercritical double reheat boiler was analyzed in detail,according to the numerical simulation and hydrodynamic calculation.The distributions of mass flow rate,working fluid temperature and water wall temperature were obtained.The results show that,under BMCR working condition,there are obvious flow differences and water wall temperature differences in both the upper furnace and lower furnace.The fluid in water wall of both the upper furnace and lower furnace appears a minus mass flow characteristic.Therefore,the mass flow rate in the middle region is higher,while the distributions of working fluid temperature and water wall temperature are in the opposite.The results can provide guidance for hydrodynamic design and improvement of vertically-upward water wall in ultra-supercritical double reheat boilers.
Compared with the conventional utility boiler,the ultra-supercritical double reheat boiler has different characteristics,like more complex heat load distribution in the furnace,higher working fluid temperature,lower heat absorbing capacity of water in the large specific heat region,and so on.It means the design of thermal hydrodynamic is more difficult in the vertically-upward water wall of ultra-supercritical double reheat boiler.Taking the ultra-supercritical 660 MW double reheat boiler in Anyuan Power Plant as an example,the thermal hydrodynamic performance of the vertically-upward water wall of ultra-supercritical double reheat boiler was analyzed in detail,according to the numerical simulation and hydrodynamic calculation.The distributions of mass flow rate,working fluid temperature and water wall temperature were obtained.The results show that,under BMCR working condition,there are obvious flow differences and water wall temperature differences in both the upper furnace and lower furnace.The fluid in water wall of both the upper furnace and lower furnace appears a minus mass flow characteristic.Therefore,the mass flow rate in the middle region is higher,while the distributions of working fluid temperature and water wall temperature are in the opposite.The results can provide guidance for hydrodynamic design and improvement of vertically-upward water wall in ultra-supercritical double reheat boilers.
引文
[1]张威,闫凯,王欢,等.超超临界二次再热直流锅炉水冷壁水动力特性研究[J].热能动力工程,2016,31(8):75-80.ZHANG Wei,YAN Kai,WANG Huan,et al.Study on the thermal hydrodynamic performance of the water wall in a ultra-supercritical double reheat once-through boiler[J].Journal of Engineering for Thermal Energy and Power,2016,31(8):75-80.
[2]沈维道,童钧耕.工程热力学[M].北京:高等教育出版社,2007:325-328.SHEN Weidao,TONG Jungeng.Engineering thermal dynamics[M].Beijing:Higher Education Press,2007:325-328(in Chinese).
[3]RASHIDI M M,AGHAGOLI A,ALI M.Thermodynamic analysis of a steam power plant with double reheat and feed water heaters[J].Advances in Mechanical Engineering,2014,2014(2):131-137.
[4]LI Y,ZHOU L,XU G,et al.Thermodynamic analysis and optimization of a double reheat system in an ultra-supercritical power plant[J].Energy,2014,74(2):202-214.
[5]苏荣强,吴恒运,杨国田,等.超超临界二次再热机组再热蒸汽温度模型辨识[J].热力发电,2016,45(5):62-67.SU Rongqiang,WU Hengyun,YANG Guotian,et al.Reheat steam temperature model identification of ultra supercritical unit with double reheat cycles[J].Thermal Power Generation,2016,45(5):62-67.
[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]殷亚宁.二次再热超超临界机组应用现状及发展[J].电站系统工程,2013(2):37-38.YIN Yaning,Application status and development of USC unit with double reheat cycles[J].Power System Engineering,2013(2):37-38.
[8]杨华,茅义军,尹雪梅,等.二次再热锅炉烟气再循环方案的设计优化[J].电工技术,2016(3):00216-00218.YANG Hua,MAO Yijun,YIN Xuemei,et al.Improved design of flue gas recirculation in a double reheat boiler[J].Electric Engineering,2016(3):00216-00218.
[9]卢欢,杨冬,周旭,等.超临界直流锅炉水冷壁压降及出口汽温计算[J].西安交通大学学报,2011,45(1):38-42.LU Huan,YANG Dong,ZHOU Xu,et al.Calculation of pressure drop and outlet steam temperature of water wall pipes for supercirtical once-through boiler[J].Journal of Xi’an Jiaotong University,2011,45(1):38-42.
[10]张魏静,杨冬,黄莺,等.超临界直流锅炉螺旋管圈水冷壁流量分配及壁温计算[J].动力工程,2009,29(4):342-347.ZHANG Weijing,YANG Dong,HUANG Ying,et al.Calculation on flow rate distribution and wall temperature of waterwall with spiral tube coils of supercritical once-through boilers[J].Journal of Power Engineering,2009,29(4):342-347.
[11]董芃,徐艳英,兰日华.自然循环锅炉水动力回路分析法[J].哈尔滨工业大学学报,2007,39(3):462-466.DONG Peng,XU Yanying,LAN Rihua.Loop analysis method for the numerical calculation of hydrodynamic characteristic of boiler with natural circulation[J].Journal of Harbin Institute of Technology,2007,39(3):462-466.
[12]赵振宁.水动力计算的通用模型[J].华北电力技术,2004,34(12):1-4.ZHAO Zhenning.Universal model for hydrodynamic calculation[J].North China Electric Power,2004,34(12):1-4.
[13]张威,陈凯,王欢,等.蒸汽发生系统水动力特性计算通用模型[J].热力发电,2016,45(4):13-18.ZHANG Wei,CHEN Kai,WANG Huan,et al.A universal model for thermal hydrodynamic performance calculation for steam generation system[J].Thermal Power Generation,2016,45(4):13-18.
[14]车得福,李燕,姚明宇,等.一种实现锅炉水动力通用计算的新型系统划分方法:1741025[P].2006-03-01.CHE Defu,LI Yan,YAO Mingyu,et al.A new system partition method in the hydrodynamic calculation of boiler:1741025[P].2006-03-01.
[15]车得福,闫凯,吉平,等.一种锅炉水动力通用设计和校核的方法:101013416[P].2007-08-08.CHE Defu,YAN Kai,JI Ping,et al.A design and verification method of the boiler hydrodynamic calculation:101013416[P].2007-08-08.
[2]沈维道,童钧耕.工程热力学[M].北京:高等教育出版社,2007:325-328.SHEN Weidao,TONG Jungeng.Engineering thermal dynamics[M].Beijing:Higher Education Press,2007:325-328(in Chinese).
[3]RASHIDI M M,AGHAGOLI A,ALI M.Thermodynamic analysis of a steam power plant with double reheat and feed water heaters[J].Advances in Mechanical Engineering,2014,2014(2):131-137.
[4]LI Y,ZHOU L,XU G,et al.Thermodynamic analysis and optimization of a double reheat system in an ultra-supercritical power plant[J].Energy,2014,74(2):202-214.
[5]苏荣强,吴恒运,杨国田,等.超超临界二次再热机组再热蒸汽温度模型辨识[J].热力发电,2016,45(5):62-67.SU Rongqiang,WU Hengyun,YANG Guotian,et al.Reheat steam temperature model identification of ultra supercritical unit with double reheat cycles[J].Thermal Power Generation,2016,45(5):62-67.
[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]殷亚宁.二次再热超超临界机组应用现状及发展[J].电站系统工程,2013(2):37-38.YIN Yaning,Application status and development of USC unit with double reheat cycles[J].Power System Engineering,2013(2):37-38.
[8]杨华,茅义军,尹雪梅,等.二次再热锅炉烟气再循环方案的设计优化[J].电工技术,2016(3):00216-00218.YANG Hua,MAO Yijun,YIN Xuemei,et al.Improved design of flue gas recirculation in a double reheat boiler[J].Electric Engineering,2016(3):00216-00218.
[9]卢欢,杨冬,周旭,等.超临界直流锅炉水冷壁压降及出口汽温计算[J].西安交通大学学报,2011,45(1):38-42.LU Huan,YANG Dong,ZHOU Xu,et al.Calculation of pressure drop and outlet steam temperature of water wall pipes for supercirtical once-through boiler[J].Journal of Xi’an Jiaotong University,2011,45(1):38-42.
[10]张魏静,杨冬,黄莺,等.超临界直流锅炉螺旋管圈水冷壁流量分配及壁温计算[J].动力工程,2009,29(4):342-347.ZHANG Weijing,YANG Dong,HUANG Ying,et al.Calculation on flow rate distribution and wall temperature of waterwall with spiral tube coils of supercritical once-through boilers[J].Journal of Power Engineering,2009,29(4):342-347.
[11]董芃,徐艳英,兰日华.自然循环锅炉水动力回路分析法[J].哈尔滨工业大学学报,2007,39(3):462-466.DONG Peng,XU Yanying,LAN Rihua.Loop analysis method for the numerical calculation of hydrodynamic characteristic of boiler with natural circulation[J].Journal of Harbin Institute of Technology,2007,39(3):462-466.
[12]赵振宁.水动力计算的通用模型[J].华北电力技术,2004,34(12):1-4.ZHAO Zhenning.Universal model for hydrodynamic calculation[J].North China Electric Power,2004,34(12):1-4.
[13]张威,陈凯,王欢,等.蒸汽发生系统水动力特性计算通用模型[J].热力发电,2016,45(4):13-18.ZHANG Wei,CHEN Kai,WANG Huan,et al.A universal model for thermal hydrodynamic performance calculation for steam generation system[J].Thermal Power Generation,2016,45(4):13-18.
[14]车得福,李燕,姚明宇,等.一种实现锅炉水动力通用计算的新型系统划分方法:1741025[P].2006-03-01.CHE Defu,LI Yan,YAO Mingyu,et al.A new system partition method in the hydrodynamic calculation of boiler:1741025[P].2006-03-01.
[15]车得福,闫凯,吉平,等.一种锅炉水动力通用设计和校核的方法:101013416[P].2007-08-08.CHE Defu,YAN Kai,JI Ping,et al.A design and verification method of the boiler hydrodynamic calculation:101013416[P].2007-08-08.