| 摘要: |
| 丙烷预冷混合制冷剂流程是目前最常用的天然气液化流程，该流程结合了级联式液化流程与混合制冷剂流程液化流程的优点，既高效又简单。由于实际情况中存在外界因素的干扰，需要控制器来维持液化装置的稳定，因此需要针对液化工艺的控制系统进行动态仿真分析。通过动态仿真技术分别模拟了液位控制、温度控制和串级控制应用在丙烷预冷混合制冷剂工艺各系统中的适应性，在此基础上通过改变控制器的设定值得出液化工艺系统的响应以及恢复稳定所需的响应时间，从而得出各个系统最优的控制方式。结果表明：在丙烷预冷混合制冷剂液化工艺中，丙烷预冷系统采用液位控制或串级控制，混合制冷剂系统采用液位控制，天然气系统采用串级控制时系统具有较好的稳定性和较快的响应速度。 |
| 关键词: 制冷剂 液化工艺 控制 动态仿真 |
| DOI： |
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| 基金项目:国家科技重大专项（2011ZX05026-006-07）资助项目。 |
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Pan Hongyu, Li Shunli, Li Yuxing, Zhu Jianlu
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| (College of Pipeline and Civil Engineering, China University of Petroleum(East China)) |
| Abstract: |
| Propane pre-cooling and mixed-refrigerant process, an efficient and simple process and a combination of cascading liquefaction and mixed-refrigerant liquefaction processes, is the most common natural gas liquefaction process by now. Due to the interference of external factors in the actual situation, it is necessary to maintain the stability of liquefaction plant by the controller. Hence the dynamic simulation analysis for the liquefaction process control system is needed. In this paper, the flexibility of liquid level control, temperature control and cascade control in the systems of propane pre-cooling and mixed-refrigerant process is simulated respectively by dynamic simulation, and then the response of liquefaction process and the responding time to stability can be known by changing the settings of controller. In this way, the optimal control mode of each system has been got. It indicates that the systems have better stability and faster responding speed when the propane pre-cooling system adopts liquid level control or cascade control, mixed refrigerant process applies the liquid level control, and the gas system uses cascade control. |
| Key words: refrigerant liquefaction process control dynamic simulation |
