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介绍了温差贡献值法的基本原理 ,分析了系统传热温差的改变对系统总传热面积的影响 ,结果表明 ,当系统的传热温差增大或减小时 ,换热面积的减小或增加主要集中在夹点两侧的换热器上。此外 ,分别用单一夹点温差法和温差贡献值法对某常减压 -加氢联合装置进行了优化计算 ,结果表明 ,采用温差贡献值法比采用单一夹点温差法能获得更优的改造方案。
The basic principle of temperature difference contribution method is introduced and the influence of the change of system heat transfer temperature on the total heat transfer area is analyzed. The results show that when the heat transfer temperature difference increases or decreases, the heat transfer area decreases or increases Mainly on the pinch on both sides of the heat exchanger. In addition, a single nodal point temperature difference method and the temperature difference contribution method were used to optimize a conventional depressurization-hydrogenation unit. The results show that the temperature difference contribution method is better than the single nip temperature difference method Program.