1000MW宽负荷超超临界机组锅炉水动力特性计算及分析
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摘要
针对1000 MW高效宽负荷率超超临界机组锅炉结构特点,将水冷壁划分为由流量回路、压力节点和连接管组成的流动网络系统。根据质量守恒方程、动量守恒方程、能量守恒方程,建立了超超临界垂直管圈锅炉水冷壁水动力计算模型。利用牛顿弦割法求解非线性模型得到了锅炉在BMCR负荷、75%THA负荷和30%THA负荷下的流量分配、炉膛出口汽温及水冷壁金属壁温分布情况。计算结果表明:各负荷下,壁温和鳍片温度在材料许可范围内,该采用垂直管圈的超超临界机组锅炉水冷壁在水动力方面安全可靠;30%THA负荷时水冷壁不会发生流动不稳定性。
According to the structural character of an ultra-supercritical 1 000 MW unit boiler with high frequency and broad regulation load, the water system can be equivalent to a network system consisting of flow circuits, pressure grids and connecting tubes. On the basis of the mass conservation equation, momentum conservation equation and energy conservation equation, the hydrodynamic calculation model of water wall of the ultra-supercritical vertical tube coils boiler is established. By using the Newton's chord cutting method, the nonlinear model is solved, and the mass flux distribution, outlet vapor temperatures and metal temperatures at BMCR, 75%THA and 30%THA load are obtained. The results show that, the temperature of the wall and fin is within the allowable range of materials and the water wall of the ultra-supercritical vertical tube coils boiler is safe and reliable in hydrodynamic aspect. The water wall will not flow instability at 30% THA load.
According to the structural character of an ultra-supercritical 1 000 MW unit boiler with high frequency and broad regulation load, the water system can be equivalent to a network system consisting of flow circuits, pressure grids and connecting tubes. On the basis of the mass conservation equation, momentum conservation equation and energy conservation equation, the hydrodynamic calculation model of water wall of the ultra-supercritical vertical tube coils boiler is established. By using the Newton's chord cutting method, the nonlinear model is solved, and the mass flux distribution, outlet vapor temperatures and metal temperatures at BMCR, 75%THA and 30%THA load are obtained. The results show that, the temperature of the wall and fin is within the allowable range of materials and the water wall of the ultra-supercritical vertical tube coils boiler is safe and reliable in hydrodynamic aspect. The water wall will not flow instability at 30% THA load.
引文
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[14]YU J,JIA B,WU D,et al.Optimization of heat transfer coefficient correlation at supercritical pressure using genetic algorithms[J].Heat&Mass Transfer,2009,45(6):757-766.
[15]茆凯源,聂鑫,谢海燕,等.超超临界1 000 MW二次再热机组锅炉水动力及流动不稳定性计算分析[J].热力发电,2017,46(8):36-41.MAO Kaiyuan,NIE Xin,XIE Haiyan,et al.Computational analysis on hydrodynamic characteristics and flow instability of an ultra supercritical 1 000 MWdouble-reheat unit boiler[J].Thermal Power Generation,2017,46(8):36-41.
[2]秦小阳.600 MW超临界火电机组不投油深度调峰技术分析应用[J].中国电业:技术版,2015(5):36-39.QIN Xiaoyang.Analysis and application of 600 MWsupercritical thermal power units without oil depth peak-load regulation[J].China Electric Power(Technology Edition),2015(5):36-39.
[3]焦庆丰,雷霖,李明,等.国产600 MW超临界机组宽度调峰试验研究[J].中国电力,2013,46(10):1-4.JIAO Qingfeng,LEI Lin,LI Ming,et al.Testing on domestically-made 600 MW supercritical units in broad peak-regulation of Power Grids[J].Electric Power,2013,46(10):1-4.
[4]周俊波,刘茜,张华,等.典型燃煤锅炉低负荷及变负荷运行控制特性分析[J].热力发电,2018,47(9):34-39.ZHOU Junbo,LIU Xi,ZHANG Hua,et al.Control characteristics analysis of typical coal-fired boilers during low load or variable load running[J].Thermal Power Generation,2018,47(9):34-39.
[5]张晓鲁,张勇,李振中.高效宽负荷率超超临界机组关键技术研发与工程方案[J].动力工程学报,2017,37(3):173-178.ZHANG Xiaolu,ZHANG Yong,LI Zhenzhong.R&D of key technologies for a high-efficient wide-load-range ultra-supercritical unit and the engineering schemes[J].Journal of Chinese Society of Power Engineering,2017,37(3):173-178.
[6]余海鹏,康剑南,包伟伟.1 000 MW高效宽负荷率超超临界机组给水温度的优化研究[J].浙江电力,2017,36(9):67-70.YU Haipeng,KANG Jiannan,BAO Weiwei.Optimization of feedwater temperature for a 1 000 MWultra-supercritical unit with high efficiency and wide load[J].Zhejiang Electric Power,2017,36(9):67-70.
[7]ADAM E J,MARCHETTI J L.Dynamic simulation of large boilers with natural recirculation[J].Computers&Chemical Engineering,1999,23(8):1031-1040.
[8]KIM H,CHOI S.A model on water level dynamics in natural circulation drum-type boilers[J].International Communications in Heat&Mass Transfer,2005,32(6):786-796.
[9]PAN J,YANG D,YU H,et al.Mathematical modeling and thermal-hydraulic analysis of vertical water wall in an ultra supercritical boiler[J].Applied Thermal Engineering,2009,29(11):2500-2507
[10]杨冬,于辉,华洪渊,等.超(超)临界垂直管圈锅炉水冷壁流量分配及壁温计算[J].中国电机工程学报,2008,28(17):32-38.YANG Dong,YU Hui,HUA Hongyuan,et al.Numerical computation on the mass flow rate profile and metal temperature in vertical water wall of an ultra supercritical boiler[J].Proceedings of the CSEE,2008,28(17):32-38
[11]WANG L,YANG D,SHEN Z,et al.Thermal-hydraulic calculation and analysis of a 600 MW supercritical circulating fluidized bed boiler with annular furnace[J].Applied Thermal Engineering,2016,95(130):42-52.
[12]王孟浩,李绰文,董祖康,等.电站锅炉水动力计算方法(JB/Z 201-83)[M].上海:上海发电设备成套设计研究所,1983:35-48.WANG Menghao,LI Chuowen,DONG Zukang,et al.The national standard of the boiler hydrodynamics calculation(JB/Z 201-83)[M].Shanghai:Shanghai Power Equipment Packaged Design Research Institute,1983:35-48.
[13]王思洋,王文毓,沈植,等.高效宽负荷率超超临界锅炉垂直管圈水冷壁在低质量流速下的传热特性[J].动力工程学报,2017,37(2):85-90.WANG Siyang,WANG Wenyu,SHEN Zhi,et al.Heat-transfer performance of vertical water wall in an ultra-supercritical pressure boiler with high efficiency and wide regulation load at low mass flux[J].Journal of Chinese Society of Power Engineering,2017,37(2):85-90.
[14]YU J,JIA B,WU D,et al.Optimization of heat transfer coefficient correlation at supercritical pressure using genetic algorithms[J].Heat&Mass Transfer,2009,45(6):757-766.
[15]茆凯源,聂鑫,谢海燕,等.超超临界1 000 MW二次再热机组锅炉水动力及流动不稳定性计算分析[J].热力发电,2017,46(8):36-41.MAO Kaiyuan,NIE Xin,XIE Haiyan,et al.Computational analysis on hydrodynamic characteristics and flow instability of an ultra supercritical 1 000 MWdouble-reheat unit boiler[J].Thermal Power Generation,2017,46(8):36-41.
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