煤化工合成气低温分离工艺优化与分析.

bjective Taking the coal chemical process of a company in Hami, Xinjiang as the research object, the problem of high energy consumption in the low temperature separation and liquefaction system of coal chemical syngas was solved. Methods Aspen HYSYS software was used to simulate the separation liquefaction process of the single mixed refrigerant synthetic natural gas. The distribution ratio of the component in mixed refrigerant and the first and second stage compression pressure of the mixed refrigerant cycle were optimized by using BOX algorithm, with the minimum specific power consumption of the system as the objective function and the minimum heat transfer temperature difference of the cold box as the constraint condition of 3 ℃. Results The results show that the cold-heat composite curve of the optimized cold box is closer and smoother and the heat exchange effects are optimized, while keeping the production of LNG and methanol raw gas unchanged, with overall power consumption of the system decreased by 16.59%, exergy efficiency increased from 37.96% to 43.04%, significantly increasing the energy utilization rate. Conclusions The optimization of mixed refrigerant ratio and compression pressure by BOX algorithm has a significant effect on reducing energy consumption of syngas liquefaction process and increasing exergy efficiency, which has reference significance for the research of low temperature separation and liquefaction process of syngas in coal chemical industry. [ABSTRACT FROM AUTHOR]