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提出了2种采用液化天然气(LNG)冷量的新流程,并采用Aspen Plus对流程进行了模拟计算。空气循环膨胀制冷的液体空分流程采用LNG冷量代替了空气外循环制冷,简化了制冷系统,与原始流程相比,液态产品的单位能耗降低约49%;氮气循环膨胀制冷的液体空分流程采用LNG冷量代替了高压氮气外循环制冷,系统所需循环氮气量减少,最高运行压力从4.6 MPa降低到了2.6 MPa,液态产品的单位能耗降低约53%。对流程的分析表明,与原始流程相比,新流程制冷单元的损失大大降低,系统整体的效率也得到了提高,LNG冷量回收用于空分流程制冷系统有利于节约生产成本,降低能耗,提高系统能量利用效率。
Two new processes using liquefied natural gas (LNG) were proposed, and the process was simulated using Aspen Plus. Air circulation expansion refrigeration liquid air separation process using LNG cold instead of air outside the loop refrigeration, simplifying the refrigeration system, compared with the original process, the liquid product unit energy consumption decreased by about 49%; nitrogen cycle expansion refrigeration liquid air separation The process uses LNG cold instead of high pressure nitrogen outside the loop refrigeration, the system needs to reduce the amount of nitrogen cycle, the maximum operating pressure decreased from 4.6 MPa to 2.6 MPa, the liquid product unit energy consumption decreased by about 53%. The analysis of the process shows that compared with the original process, the loss of the refrigeration unit in the new process is greatly reduced and the overall system efficiency is also improved. The recovery of the LNG for the air separation process refrigeration system is beneficial to saving the production cost and reducing the energy consumption Consumption, improve system energy efficiency.