利用LNG冷能的空气分离流程
Air Separation Process by Usage of LNG Cold Energy and Its Performance
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- 引用格式:
-
梁光川,蒲鹤,李俊,龙玉娟.利用LNG冷能的空气分离流程[J].天然气与石油,2013,31(3):0.doi:
.Air Separation Process by Usage of LNG Cold Energy and Its Performance[J].Natural Gas and Oil,2013,31(3):0.doi:
- DOI:
- 作者:
- 梁光川1 蒲 鹤1 李 俊2 龙玉娟3
- 作者单位:
- 1.西南石油大学石油工程学院，2.中国石油塔里木油田公司油气运销部，3.中国石油青海油田公司采油二厂
- 关键词:
- 液化天然气；冷能利用；空分流程；Aspen Plus软件；流程模拟
LNG； Cold energy； Air separation process； Exergy analysis； Aspen Plus software； Process simulation
- 摘要:
- 常规空气分离方法通过采用高压空气冷却膨胀制冷来提供空分系统所需的冷量，气体压缩需要消耗大量电和水。将LNG的低温冷能用于空分系统后，单位产品的能耗会大幅降低。从热力学角度出发，指出该LNG冷能回收利用方式的合理性。对LNG高品质的低温冷能用于空气分离的工艺进行改进，以期回收LNG冷能的同时降低空分系统的动力功耗。在详细介绍流程的基础上，着重讨论流程在运行压力、单位能耗等方面的特点。采用Aspen Plus软件对流程进行模拟和分析，物性方法选择Peng-Robinson方程。结果表明，该冷能冷却空分流程单位液态产品能耗为0.3 kW·h/kg，远低于传统空分流程约为1.0 kW·h/kg的能耗。
Conventional air separation method applies high pressure air cooling and expansion refrigeration to provide the cooling capacity required in air separation system and a good deal of electricity and water is needed in gas compression process. If LNG cryogenic cold energy is used in air separation system， energy consumption per unit product will be greatly reduced. From the angle of thermodynamics， pointed out is the rationality of LNG cold energy recycling way. In order to recover LNG cold energy and reduce power consumption of the air separation system， improved is the process of the high-quality LNG cryogenic cold energy used for air separation. Introduced are such technological process and its characteristics and applied is Aspen Plus software to simulate the process and selected is Peng-Robinson equation as physical property method and the results show that energy consumption of unit liquid state product in the process is 0.3 kW·h·kg-1， far lower than 1.0kW·h·kg-1 in traditional air separation process.
