富气乙烷回收流程制冷工艺的分析比选

Analysis and selection of refrigeration process in rich gas ethane recovery process

为比选出基于GLSP乙烷回收流程的最优制冷工艺,首先针对丙烷制冷与膨胀机联合制冷、复叠式制冷、混合冷剂制冷3种制冷工艺进行能耗分析。研究表明,GLSP流程中制冷工艺能耗最低的是丙烷制冷与膨胀机联合制冷工艺,比最接近的复叠式制冷工艺低626 kW。对3种制冷工艺进行[火用]分析后表明,[火用]损失量最大的设备是脱甲烷塔,占总[火用]损量的29.04%。可通过调节物流进料位置和塔板数,让塔内温度变化更为平稳、连续,从而减小脱甲烷塔的[火用]损失。最后通过经济效益分析得出,3种制冷工艺中丙烷制冷和膨胀机制冷的联合制冷工艺的经济效益最为显著,比最接近的混合冷剂制冷工艺年收益多437万元。

In order to select out the optimal refrigeration process based on GLSP ethane recovery process,energy consumption analysis is conducted for three refrigeration processes including propane refrigeration-expander combining refrigeration,cascade refrigeration and mixed refrigerant refrigeration.It is shown that the propane refrigeration-expander combining refrigeration consumes the lowest energy in the GLSP process,which is 626 k W lower than the closest cascade refrigeration process.The exergy analysis on three refrigeration processes shows that the demethanizer is the equipment with the largest exergy loss,which accounts for 29.04%of total exergy loss.By adjusting the material feed positions and the number of trays,the temperature in the tower can change more stably and continuously,thereby reducing the exergy loss in the demethanizer.It is found through economic benefit analysis that the propane refrigeration-expander combining refrigeration exhibits the best economic benefit among three refrigeration processes,which is RMB 4.37 million per year more than the closest mixed refrigerant refrigeration.