低压法氯气液化工艺的选择

Selection of low pressure processes for chlorine liquefaction

文中概述氯气在工业上的用途以及氯气的相关物性,简述几种氯气液化的工艺,根据液化压力以及液化温度的不同,可以分为高压法、中压法以及低压法;着重介绍了低压法氯气液化的2种工艺,R-22直接冷冻法和氨-氯化钙盐水间接冷冻法。通过R-22直接冷冻工艺与氨-氯化钙盐水间接冷冻工艺相比较,得到采用R-22直接冷冻工艺进行氯气液化比较经济节能的结论,并结合工程实际,具体说明采用R-22直接冷冻工艺经济节能的数值。

The use of chlorine in industry and its related physical properties were summarized, and several processes of chlorine liquefaction were described. According to the different liquefaction pressure and temperature, chlorine liquefaction can be divided into high-pressure method, medium-pressure method and low-pressure method. The low-pressure method of chlorine liquefaction （ i. e. R-22 directly freezing method and ammonia-calcium chloride saltwater indirect freezing method） was emphatically introduced. Comparing R-22 directly freezing process with ammonia-calcium chloride saltwater indirectly freezing method, it concludes that R-22 directly freezing process for chlorine liquefaction is comparatively economic energy-saving. Combined with the practical engineering projects, the detail values of economic energy-saving based on R-22 directly freezing technology were explained.