宁夏灵武2×600MW直接空冷系统优化研究
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摘要
气象条件、厂址所处地形地貌和空冷平台周围建筑物的布置对空气冷凝器的换热效果有很大影响,严重影响汽轮机的背压,极端的情况会造成电厂停机。因此,对空冷系统进行模拟试验,了解各种因素对空冷系统换热效率的影响程度,对电厂设计和经济、安全运行十分必要。本文通过数值模拟给出宁夏灵武电厂自然风对空气冷凝器的影响规律,再结合当地的气象资料,对直接空冷系统的设计提供依据,并尽量减少不利状况对整个系统的影响。
Meteorologic condition, plant position and building layout around the air-cooled flat will badly affect heat transfer effect of air-condenser and turbine backpressure, so far to induce the unit tripping out. So it is very important to air-cooled unit that simulation test and realizing all factors influence degree to air-cooled unit heat transfer efficiency. After numerical simulating, the paper lays out the influence rule that natural air affects the air condenser. According to the local meteorologic data, it supplies foundation to direct air-cooled unit design, and helps to reduce adverse influence to the whole unit.
Meteorologic condition, plant position and building layout around the air-cooled flat will badly affect heat transfer effect of air-condenser and turbine backpressure, so far to induce the unit tripping out. So it is very important to air-cooled unit that simulation test and realizing all factors influence degree to air-cooled unit heat transfer efficiency. After numerical simulating, the paper lays out the influence rule that natural air affects the air condenser. According to the local meteorologic data, it supplies foundation to direct air-cooled unit design, and helps to reduce adverse influence to the whole unit.
引文
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[24] 张春雨,李妩.排数对矩形翅片椭圆管束换热的影响.华南理工大学学报(自然科学版)1995,23(10):117~122
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[26] 屈治国,何雅玲,陶文铨.平直开缝翅片传热特性的三维数值模拟及场协同原理分析.工程热物理学报.2003,24(5):825~827
[27] 胡俊伟,丁国良.开缝翅片压降和换热特性的数值模拟.上海交通大学学报.2004,38(10):1639~1642
[28] 苏华,王厚华,李慧风 .穿孔翅片管的实验研究及翅片效率分析 .REF 租GEARTION.Z000,19(3):18~22
[29] 柳飞,何国庚.多排数翅片管空冷器风阻特性的数值模拟.制冷与空调.2004,4件):30~33
[30] 张鹏,史佑吉,高伟桐,胡三季.进风角度对钢制椭圆管散热器热力阻力特性的影响.热力发电.1997,l:19~21
[31] 杨立军,杜小泽,刘登赢等.扁平管外蛇形翅片空间的流动换热性能数值模拟.中国工程热物理学会第 11 届年会.2005
[32] 陶文铨.数值传热学.西安交通大学出版社,2001
[2] 王佩章.单机 600MW 大型空冷电厂的节水能力与废水零排放.电站辅机.2004,88(l):23~26
[3] 那小桃,郝卫,王宏格.电站直接空冷系统设计探讨.电力学报.1999,14(l):8~11
[4] 赵之东,杨丰利.直接空冷凝汽器的发展和现状.华北电力技术,2004,5:44~50
[5] 刘邦泉.直接空冷机组的真空严密性试验方法及标准.华北电力技术,2004,5:10~14
[6] 伍小林,刘邦泉.直接空冷机组有关问题探讨.华北电力技术,2004,5:5~9
[7] 续宏,于天群,彭焕炳,祁智明.6000KW 机组直接空冷系统试验研究.山西电力,2003,3:1~5
[8] 武俊.600MW 机组直接空冷技术在国内的应用.华北电力技术,2005,3:1~720
[9] 顾志福,张文宏,李辉,彭继业.电厂直接空冷系统风效应风洞模拟实验研究.热能动力工程.2003,104(18):159~162
[10] 马晓茵,梁淑华.空气横掠两种翅片管冷凝元件的对比实验.电站辅机.1997,3:13~17
[11] 过增元,黄素逸.场协同原理与强化传热新技术.北京:中国电力出版社.2004
[12] JIIN Yuh JANG, JYH-Yau Yang. Expermiental and 3D numerical anayalsis of the thermal-Hydrualic characteristics of elliptic finned-tube heat exchangers. Heat transfer engineering.1998,19(4):55~66
[13] 屠珊,杨冬,黄锦涛,陈听宽,罗毓珊.椭圆翅片管空冷器流动传热特性的研究.热能动力工程.2000,15(89):455~458
[14] 高延福,张秋云.矩形钢翅片椭圆管簇的试验研究.热能动力工程.1997,12仅):96~99
[15] 刘希女,杨永安,邹同华.叉排椭圆管强迫对流换热的数值模拟.制冷与空调.2004,1:16~19
[16] R. S. Moats,J. V. C. Vgaras,T. A. Luarsne,A. Bejna. Optimally staggered finned circular and elliptic tubes in forced convection. International Journal of heat and mass transfer.2004(47),13447~1359
[17] LI Qingling,QI Shouliang,ZHAN Xuewei,et. al. Heat transfer characteristics and flow behaviors of elliptic cylinders in crossflow.青岛科技大学学报.2004,25(5):434~440
[18] 康海军,李斌,李慧珍,辛荣昌,陶文铨.平直翅片管换热器传热与阻力特性的实验研究.西安交通大学学报.1994,28(l):91~98
[19] 宋富强.空调用翅片管换热器的数值研究.西安:西安交通大学「D].2002
[20] R M Ricardo,M Sen,K T Yan. Effect of fin spacing on convection in a plate fin and tube heat exchanger [J]. Internet. J. Heat Mass Transfer.2000,43:39~51
[21] Mi Sandar Mon , Ulrich Gross. Numerical study of fin-spacing effects in annular-finned tube heat exchangers. International Journal of heat and mass transfer.2004,47:1953~1964
[22] 高伟桐,史佑吉,张鹏,胡三季.钢制空冷散热器试验研究.热力发电.1990,2:52~58
[23] 李妩,张春雨.带扰流孔的矩形翅片表面换热机理的实验研究.西安交通大学学报.1994,28(6):80~85 华北电力大学硕士学位论文
[24] 张春雨,李妩.排数对矩形翅片椭圆管束换热的影响.华南理工大学学报(自然科学版)1995,23(10):117~122
[25] 王厚华,杨延萍,江村.单片矩形翅片表面的换热系数分布.重庆建筑大学学报.1998,20(5):57~60
[26] 屈治国,何雅玲,陶文铨.平直开缝翅片传热特性的三维数值模拟及场协同原理分析.工程热物理学报.2003,24(5):825~827
[27] 胡俊伟,丁国良.开缝翅片压降和换热特性的数值模拟.上海交通大学学报.2004,38(10):1639~1642
[28] 苏华,王厚华,李慧风 .穿孔翅片管的实验研究及翅片效率分析 .REF 租GEARTION.Z000,19(3):18~22
[29] 柳飞,何国庚.多排数翅片管空冷器风阻特性的数值模拟.制冷与空调.2004,4件):30~33
[30] 张鹏,史佑吉,高伟桐,胡三季.进风角度对钢制椭圆管散热器热力阻力特性的影响.热力发电.1997,l:19~21
[31] 杨立军,杜小泽,刘登赢等.扁平管外蛇形翅片空间的流动换热性能数值模拟.中国工程热物理学会第 11 届年会.2005
[32] 陶文铨.数值传热学.西安交通大学出版社,2001