天然气液化工艺动态分析  

Dynamic analysis of liquefied natural gas process

作　　者：杜国勇[1] 王明[1] 李艳[1] 

机构地区：[1]西南石油大学化学化工学院,四川成都610500

出　　处：《化学工程》2013年第12期60-64,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51104126)

摘　　要：针对在天然气液化过程中原料气参数时常发生变化,导致液化流程工艺参数处于不稳定状态,而这些参数的变化对液化系统产生的影响不能通过静态模拟来分析。利用Aspen Dynamics对液化系统在受到扰动的情况下进行动态模拟,以得到系统响应曲线并作动态分析。结果表明:系统对原料气参数变化做出不同程度的动态响应,其中温度干扰对系统稳定性影响较大,当施加不同方向的扰动时,系统出现反响现象,同时,根据模拟中液化系统所出现的反响特征,提出通过控制预冷制冷剂压缩机功率和深冷制冷剂节流阀开度来分别控制预冷和深冷制冷量的控制配对,通过动态模拟,证明该控制结构能对干扰迅速做出调整,提高了系统的稳定性。Viewing that the feed gas parameters changed frequently in the natural liquefaction process causes the liquefaction process parameters in an unstable state, but the impact of changes of these parameters on the liquefaction system can not be analyzed by steady simulation, the liquefaction process was simulated by Aspen Dynamics under the condition of disturbance to get system response curves for dynamic analysis. The result shows that the liquefaction system has different response in various degrees when the raw gas parameters change, especially the temperature disturbance can result in strong dynamic response. The liquefaction system presents the repercussions phenomenon when applying different directions disturbance. Meanwhile, based on the response characteristics of the liquefaction system during dynamic simulation, it is proposed that the control of the cooling capacity of each circle can be performed via controlling the pre-cooling refrigerant compressor power and cryogenic refrigerant throttle opening degree, proving that the control structure is able to make a quick response to system disturbance and improve the stability of natural gas liquefaction system.

关 键 词：液化工艺 混合制冷剂 ASPEN DYNAMICS 动态模拟 扰动分析 

分 类 号：TE646[石油与天然气工程—油气加工工程]