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化工学报  2015 

丙烷预冷混合制冷剂液化工艺原料气敏感性分析

DOI: 10.11949/j.issn.0438-1157.20150733, PP. 186-191

Keywords: 丙烷预冷,混合制冷剂,天然气,动态仿真,稳定性,敏感性分析

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Abstract:

液化天然气液化后的体积仅为原体积的1/625,十分有利于运输和储存。丙烷预冷混合制冷剂液化工艺是目前最常用的天然气液化工艺,该工艺结合了级联式液化流程与混合制冷剂液化流程的优点,既高效又简单,目前世界上80%以上的基本负荷型天然气液化装置采用了此流程。由于实际情况中原料气的入口压力、温度、组分均存在变化的可能,需要针对工艺的原料气敏感性进行动态仿真分析。通过分别添加原料气压力、温度、组分的扰动,得到了各个工艺系统的动态响应。结果表明:当丙烷预冷混合制冷剂液化工艺分别存在原料气压力、温度、组分扰动时,各个系统均能在一段时间后重新恢复稳定,稳定时间为20~250min。验证了丙烷预冷混合制冷剂液化工艺在原料气入口条件扰动时的稳定性和可靠性。

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