引用本文:王元春,程小姣,高俊,王思茜,曹连进. 阶式双混合冷剂液化天然气流程的混合制冷剂研究[J]. 石油与天然气化工, 2015, 44(3): 50-53.
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阶式双混合冷剂液化天然气流程的混合制冷剂研究
王元春1,程小姣1,高俊2,王思茜3,曹连进2
1.中国石油集团工程设计有限责任公司北京分公司;2. “油气藏地质及开发工程”国家重点实验室·西南石油大学 ;3.四川石油天然气建设工程有限责任公司
摘要:
为了降低混合制冷剂液化天然气流程功耗,采用预冷循环。其中,阶式双混合冷剂液化天然气流程得到广泛应用。通过建立阶式双混合冷剂液化流程比功耗的目标函数,分析预冷温度、混合制冷剂组成及配比与液化流程比功耗的关系得出:混合工质预冷的最佳温度为-50 ℃,预冷混合制冷剂由C2H6~C5H12组成,深冷混合制冷剂应为N2、CH4~C3H8组成；同时,混合制冷剂最佳配比为比功耗最小所对应的各组分的含量。 
关键词:  双混合冷剂  预冷温度  液化  组成  最佳配比 
DOI：10.3969/j.issn.1007-3426.2015.03.011
分类号:TE646
基金项目:
Mixed refrigerant research of LNG process with cascade double mixed refrigerant cycle
Wang Yuanchun1, Cheng Xiaojiao1, Gao Jun2, Wang Siqian3, Cao Lianjin2
(1. China Petroleum Engineering Co., Ltd. Beijing Company, Beijing 100000, China;2.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;3. Sichuan Oil & Gas Construction Engineering Co.,Ltd, Chengdu 610213, China)
Abstract:
To reduce the power of mixed refrigerant cycle (MRC), the process used the pre-cooling cycle. The cascade double mixed refrigerant cycles are widely used in pre-cooling cycle. This paper established the objective function of unit power consumption of the double mixed refrigerant cycle to analyze the relationship among pre-cooling temperature, composition and proportion of MR and the unit power consumption. As the result, the best pre-cooling temperature was -50 ℃. The composition of pre-cooling mixed refrigerant is from C2H6 to C5H12, and the deep-cooling mixed refrigerant should include N2, CH4, C2H6 and C3H8. Meanwhile, the optimum proportion of the mixed refrigerant is the content of each component corresponding to the minimum unit specific power consumption.
Key words:  double mixed refrigerant  pre-cooling temperature  liquefaction  composition  optimum proportion