三种混合制冷剂循环液化天然气的比功耗和对比
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摘要
针对利用混合制冷剂循环液化天然气技术能降低循环功耗及提高?效率的特点,通过建立模拟的无预冷混合制冷剂循环、三级丙烷预冷混合制冷剂循环和单级丙烷预冷混合制冷剂循环3种天然气液化模型,在一定约束条件下模拟计算液化过程压缩机的比功耗、损失及制冷剂流量,对比分析压缩机的比功耗和损失。结果表明:无预冷混合制冷剂循环的比功耗和损失量都是最大的,其比功耗分别是三级丙烷预冷混合制冷剂循环的7.28倍、单级丙烷预冷混合制冷剂循环的7.23倍,其损失量是三级丙烷预冷混合制冷剂循环的10.74倍、单级丙烷预冷混合制冷剂循环的10.62倍;但单级丙烷预冷混合制冷剂循环较三级丙烷预冷混合制冷剂循环有流程更简单、更便于维护的优势。因此应优先选用单级丙烷预冷混合制冷剂循环液化流程。
The technology of mixed refrigerant cycle to LNG may not only reduce power consumption but also improve exergy efficiency. So, three models of liquefaction process were developed, including mixed refrigerant cycle without pre-cooling, and singlestage and three-stage propane-precooled mixed refrigerants cycle.Under the condition of certain constraints, these models were used to simulate and calculate the unit power consumption, exergy loss,and refrigerant flow of the air compressor. Furthermore, unit power consumption and exergy loss were analyzed. Results show that(1)for the mixed refrigerant cycle without pre-cooling, its unit power consumption and exergy loss are the biggest ones among these of single-stage and three-stage propane-precooled mixed refrigerants cycle 7.28 times and 10.74 times of three-stage one, and 7.23 times and 10.62 times of one-stage one, individually; and(2)single-stage one is superior to three-stage one owing to simpler process and more easy maintenance. In general, the single-stage propane-precooled mixed refrigerant cycle should be optimally selected.
The technology of mixed refrigerant cycle to LNG may not only reduce power consumption but also improve exergy efficiency. So, three models of liquefaction process were developed, including mixed refrigerant cycle without pre-cooling, and singlestage and three-stage propane-precooled mixed refrigerants cycle.Under the condition of certain constraints, these models were used to simulate and calculate the unit power consumption, exergy loss,and refrigerant flow of the air compressor. Furthermore, unit power consumption and exergy loss were analyzed. Results show that(1)for the mixed refrigerant cycle without pre-cooling, its unit power consumption and exergy loss are the biggest ones among these of single-stage and three-stage propane-precooled mixed refrigerants cycle 7.28 times and 10.74 times of three-stage one, and 7.23 times and 10.62 times of one-stage one, individually; and(2)single-stage one is superior to three-stage one owing to simpler process and more easy maintenance. In general, the single-stage propane-precooled mixed refrigerant cycle should be optimally selected.
引文
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[2]尹全森,李红艳,崔杰诗,等.单级混合制冷剂液化循环适应性和调节能力研究[J].低温工程,2010(1):1-4.
[3]杨建,蒋浩,蒋建志,等.混合制冷剂天然气液化流程工艺参数优化计算[J].煤气与热力,2012,32(7):7-11.
[4]Tsatsaronis G,Morosuk T.Advanced exergetic analysisof a refrigeration system for liquefaction of natural gas[J].Industrial Energy Systems Laboratory,2010(1):1-17.
[5]鲁雪生,顾安忠,汪荣顺.小型撬装式LNG装置的流程模拟[J].化工学报,2006,57(6):1 290-1 295.
[6]Cao W,Lu X,Lin W,et al.Parameter comparison oftwo small-scale natural gas liquefaction processes inskid-mounted packages[J].Applied Thermal Engineer-ing,2006,26(8):898-904.
[7]Mortazavi A,Somers C,Hwang Y,et al.Performanceenhancement of propane pre-cooled mixed refrigerantLNG plant[J].Applied energy,2012,93(1):125-131.
[8]袁树明,刘兰慧,范学军,等.丙烷预冷混合制冷剂天然气液化流程工艺计算[J].煤气与热力,2010,30(8):7-9.
[9]Wang H,Shi X,Che D.Thermodynamic optimizationof the operating parameters for a combined power cycleutilizing low-temperature waste heat and LNG cold ener-gy[J].Applied Thermal Engineering,2013,59(1):490-497.