| 摘要: |
| 混合工质低温气体液化装置降温耗时长，系统循环工质组成对降温速度的影响大，优化工质的充装方法与步骤对系统的快速降温与可靠运行至关重要。基于气液两相容积节点原理建立了混合工质低温气体液化系统动态模拟方法，并由实际混合工质循环气体液化系统降温过程的动态实验数据进行验证。重点开展了不同温度区间的工质充装对系统降温规律的影响研究，结果表明当充装工质的相变温区接近系统最低温度时，系统降温速度最快；基于文中实验系统对甲烷及氮气充装温区的工质充装量的优化研究结果表明，甲烷的工质充装量在12%~16%系统总工质摩尔量、氮气的工质充装量在9%~12%系统总工质摩尔量时，更利于实验系统的快速降温和安全运行。 |
| 关键词: 混合工质 低温系统 降温特性 工质充装规律 动态模拟 |
| DOI： |
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| Dynamic Simulation on Temperature Decreasing Characteristics of Mixed-refrigerant Cryogenic Liquefaction System |
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Zhang Pu, Guo Kaihua, Deng Wenyuan, Deng Liqiang
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| (School of Engineering, Sun Yat-Sen University) |
| Abstract: |
| The cooling process of mixed-refrigerant (MR) cryogenic system is time-consuming, the composition of MR has significant influence on the temperature decreasing rate, and the optimization of the MR charging process is crucial in order to obtain quick temperature decreasing rate and reliable running condition. Based on the fundamental principle of two phase volume node, this article established dynamic simulation method for MR cryogenic system. The simulation results are validated by the experimental data successfully. The main work focuses on the temperature decreasing characteristics of the system with different refrigerant charging process. The results reveal that when the phase change temperature of the charging refrigerant is around the system temperature, the temperature decreasing rate is the quickest. In their own charging temperature field, when the charging CH4 is 12%~16%, and N2 is 9%~ 12% of total MR in system on mole basis, the temperature decreasing rate and working condition of the studied system in this article can be promoted effectively during these two cooling process. |
| Key words: mixed refrigerant cryogenic system temperature decreasing characteristics refrigerant charging rule dynamic simulation |
