600MW直接空冷机组冷端换热面积计算与分析  

Calculation and Analysis of Heat Radiating Area of Cold-side for the 600MW Direct Air-cooled Unit

作　　者：孙东海[1] 张树芳 申哲巍[1] 

机构地区：[1]华北电力大学动力工程系,保定071003

出　　处：《汽轮机技术》2012年第6期415-418,共4页Turbine Technology

摘　　要：分析了空冷凝汽器总传热系数的计算方法,通过迭代计算和设定的误差确定管内凝结换热系数,并将管外换热系数表达成迎面风速的函数,最终得出了总换热系数与迎面风速的关系式。建立了换热面积的目标函数,并进行了变工况计算,得出换热面积随迎面风速、排汽压力的增大而减小,随环境温度的增加而增加。通过分析初始温差ITD、迎面风速与设计气温对换热面积的影响,提出在空冷系统优化设计中,应以初始温差和迎面风速作为变量参数。This paper analysed calculation method of total heat transfer coefficient for air cooled condensers, inner-tube condensation heat transfer coefficient was determined by iterative calculation and setting error, and outer-tube heat transfer coefficient was expressed as a function of windward air velocity, then the relationship between total heat transfer coefficient and windward air speed was received. This-paper also constructed the objective function of heat-transfer area and calculated variable conditions, the relationships were that, the bigger the windward air speed and exhaust pressure were, the smaller the heat-transfer area was, but it became bigger with the raize of temperature. At last the effection of initial temperature difference ITD, windward air speed and design temperature for heat-transfer area was analyzed, it concluded that initial temperature difference ITD and windward air speed were used as variable parameters in the air cooling system to optimize design.

关 键 词：空冷系统 迎面风速 传热系数 设计气温 初始温差 

分 类 号：TK264.1[动力工程及工程热物理—动力机械及工程]