冷却塔出塔水温的迭代计算方法

The Iterative Calculation of Cooling Tower's Outlet Water Temperature

基于麦克尔焓差法原理,对循环水泵运行方式变化前后的进塔风速进行了估算,给出了冷却塔出塔水温的迭代计算方法.用数学方法对冷却塔特性数和冷却数随出塔水温及进塔风速的变化规律进行了分析,并对计算过程中非线性方程的多解选择问题及迭代退出条件进行了研究,最终确定出了符合物理意义的真实解.由此确定的循环水泵各运行方式下的出塔水温可直接用于循环水泵最优运行方式的确定,对现场中冷端系统的优化具有一定的现实意义.

Cooling tower＇s inlet wind speed before and after variation of circulating water pumps＂ running modes were both estimated on the basis of Merkel enthalpy potential method, and iterative calculation on cooling tower＇s outlet temperature was subsequently put forward. The trends of the cooling tower＇s characteristic number and cooling quantity varying with tower＇s outlet temperature and inlet wind speed were analyzed by mathematical methods. The choice of multiple solutions and exit conditions existing in solving nonlinear equation was particularly discussed. And finally the real solution conforming to the physical meaning was confirmed. Therefore, cooling towers outlet water temperature under a variety of operating modes of the circulating pump were determined. They could be directly used in determining the optimum running mode of circulating water pumps, which has practical meaning in cold end system optimization in power plant.