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四川南充轻烃回收装置采用热分离机制冷工艺，装置每天生产液化气１．５ｔ，轻油１．０ｔ，热分离机的等熵效率仅为３５％～４０％，丙烷收率不足１５％，回收装置经济效益较差。因此，为了提高回收装置的产品收率和经济效益，对其工艺装置进行技术改造十分必要。由于热分离机的等熵效率低，制冷效果差，热分离机出口含大量的液烃未回收，脱乙烷塔顶温度比原设计值偏高，造成回收装置丙烷收率低。采用ＳＨＢＷＲ状态方程作为工艺计算模型，通过工艺计算和方案对比分析，在充分利用现有流程中的设备、节省改造费用的条件下，提出了透平膨胀机制冷、二次分离的工艺改造方案。改造后的轻烃回收装置于１９９７年１２月投产，与原有装置相比，降低了制冷温度，提高了液烃收率，达到了工艺设计的改造效果。
Sichuan Nanchong Light Hydrocarbon Recovery Unit adopts the thermal separation mechanism and cold process. The unit produces 1.5t of liquefied gas and 1.0t of light oil per day. The isentropic efficiency of the thermal separator is only 35% -40% and the propane yield is less than 15% Recycling device is less economical. Therefore, in order to improve the product yield and economic efficiency of the recovery unit, it is necessary to carry out technological transformation of its process unit. Due to the low isentropic efficiency of the thermal separator, the cooling effect is poor, a large amount of liquid hydrocarbons are not recovered at the outlet of the thermal separator, and the temperature of the deethanizer overhead is higher than the original designed value, resulting in a low propane recovery rate in the recovery unit. By using SHBWR equation of state as the process calculation model, through the comparison of process calculation and scheme analysis, this paper puts forward the technological transformation scheme of the turbine expansion machine with cold and secondary separation under the condition of fully utilizing the equipment in the existing process and saving the reforming cost. The reformed light hydrocarbon recovery unit was put into operation in December 1997. Compared with the original installation, the light hydrocarbon recovery unit reduced the refrigeration temperature and raised the yield of liquid hydrocarbons, which achieved the reformation effect of the process design.