换热器传热温差的快捷优化计算

Simplified optimization calculation for heat transfer temperature difference of heat exchangers

针对换热器传热温差优化方法复杂、不方便使用的现状,提出了一种简化的优化方法,利用容易得到的有关参数,可快速计算出优化温差,非常适用于工程应用。对国内炼油厂三类常用换热器进行了计算分析,得出:在目前及今后时期内,在常用的温度范围内,水-水换热器或水-汽换热器优化的有效传温温差一般不大于10℃;常减压普通碳钢换热器温差一般不大于20℃;高压加氢反应产物换热器温差一般在35~55℃。

In view of the complexity and inconvenient use of the current heat exchanger heat transfer temperature difference optimization method,a simplified optimization method is put forward,which can quickly calculate the optimal temperature difference by using the easily available relevant parameters,and is very suitable for engineering applications.Three kinds of heat exchangers commonly used in domestic refineries are calculated and analyzed.It is pointed out that at present and in the future,within the common temperature range,the optimized effective heat transfer temperature difference is generally not greater than 10℃for water-water or water-steam heat exchangers,is generally not greater than 20℃for common carbon steel heat exchangers of atmospheric and vacuum distillation units,and is generally within 35~55℃for high pressure hydrogenation reaction effluent heat exchangers.