Abstract: The equipment cost, energy cost and Total Annual Cost (TAC) of gas fractionation unit in natural gas processing plant can be reduced through integrate three design optimization measures involve seeking for the optimal feed position of depropanizer and debutanizer, and increasing preheating heat exchanger to preheat feedstock, the interrelationship between the various process parameters of system is changed simultaneously. In order to study the impact of process optimization on the dynamic characteristics of the gas fractionation unit, the dynamic models of basic design and process optimization design were established by Aspen Dynamics based on the steady-state model. The dynamic controllability of the designs were evaluated by feed flow and feed composition disturbance change respectively. It shows that under the dual temperature control scheme, in comparison with the basic design, the process optimization design can not only enhance system thermodynamic efficiency and steady-state economic characteristics, but also improve the dynamic characteristics of the system. The research conclusions have an important guidance purpose for the production and development of gas fractionation unit.

摘要： 通过综合寻找脱丙烷塔、脱丁烷塔的最优进料位置和增加预热换热器对进料预热三项设计优化措施可以降低天然气处理厂气体分馏单元的设备成本、能耗成本和总年度成本，同时也改变了装置内部各工艺参数之间的相互关系。为了研究工艺优化对气体分馏单元动态特性的影响，在基本设计和工艺优化设计稳态模型的基础上，利用Aspen Dynamics建立系统的动态模型，分别通过进料流量和进料组分扰动变化对两种设计的动态可控性进行评价。结果表明，在双温度控制方案下，与基本设计相比，工艺优化设计不仅可以提高系统的热力学效率和稳态经济特性，系统动态特性也有一定程度的改善。研究结论对气体分馏单元的生产和开发具有重要的指导意义。

关键词: 天然气处理厂 气体分馏单元 工艺优化设计 过程控制 动态响应, Natural gas processing plant gas fractionation unit process optimization design process control dynamic performance