丙烷预冷混合制冷剂液化工艺原料气敏感性分析

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。

Sensibility analysis of feed gas in propane pre-cool mixed refrigerant liquefaction process feed gas

After liquefied at low temperature,the volume of the natural gas is only 1/625 of its original volume,greatly convenient for its conveyance and storage.Propane pre-cooled mixed refrigerant process is the most common gas liquefaction process by now,which is a combination of cascading liquefaction and mixed-refrigerant liquefaction process.Efficient as well as simple,more than 80 percent of the basic duty natural gas liquefaction plants are using this process in the world.Because of the actual situation that the pressure,temperature and component are likely to change in the inlet feed gas,it is necessary to do dynamic simulation analysis of the sensitivity of the feed gas.By adding the perturbation of pressure,temperature,component on feed gas separately,the dynamic response of the respective process system is obtained.The results show that:when the perturbation of pressure,temperature,component respectively react on propane pre-cooled mixed refrigerant liquefaction process,each system can regain stability after a period of time,and the stabilization time ranges from 20 to 250 minutes.In this way,the stability and reliability of propane pre-cooled mixed refrigerant liquefaction process are verified when the perturbation of feed gas exists.