本文關鍵詞： 水合物 動力學 流程建模 收斂方法 經濟性評價 全局優(yōu)化方法　出處：《天津大學》2016年博士論文　論文類型：學位論文

【摘要】：本論文針對催化裂化干氣和催化裂解氣低能耗分離低碳烯烴的需求,結合較高濃度油吸收效率高、較低濃度水合效率高的優(yōu)勢,開發(fā)了一種用于分離低碳氣體混合物的吸收-水合復合工藝�，F有的流程模擬軟件中均沒有關于水合物的物性計算方法,為了模擬和評估所開發(fā)的流程,本文參考現有的熱力學理論,在方程導向的建模環(huán)境中編寫了多相相平衡計算程序,并根據動力學實驗的結果,使用時間正交離散的方法,擬合了乙烯水合動力學參數。以動力學和熱力學模型為基礎,建立了水合操作單元的模型,并將模型成功地鏈接到流程模擬軟件中;在流程模擬軟件中構建了整個吸收-水合復合流程,以經濟性評估為參考,優(yōu)化了流程操作條件。計算結果表明,吸收-水合流程的年平均費用比傳統(tǒng)吸收法低12%;同時發(fā)現,雖然水合物能夠有效回收低濃度的C2,但是對于高濃度的C2,由于其內部的大小孔結構,水合物并不能提供較高的選擇性。最后,針對大規(guī)模流程高效模擬的需求,討論了化工系統(tǒng)工程的發(fā)展方向,包括更先進的建模工具、全局優(yōu)化、計算容錯和并行計算等,提出了一種實現熱耦合流程全局優(yōu)化的框架,該框架包括并行的全局優(yōu)化算法、簡化的操作單元模型、幫助流程收斂的漸變邊界法以及挾點分析等內容,該框架適用于優(yōu)化復雜的熱耦合系統(tǒng)。
[Abstract]:In this paper, according to the demand of FCC dry gas and catalytic cracking gas for low energy consumption separation of low carbon olefin, combined with the advantages of higher oil absorption efficiency and higher hydration efficiency. An absorption-hydration composite process for the separation of low-carbon gas mixtures has been developed. There are no methods for calculating the physical properties of hydrates in existing process simulation software. In this paper, referring to the existing thermodynamic theory, a multiphase equilibrium calculation program is written in the equation-oriented modeling environment. According to the results of the kinetic experiments, the method of time orthogonal discretization is used. Based on the kinetic and thermodynamic models, the model of hydration unit was established, and the model was successfully linked to the process simulation software. The whole absorption-hydration complex process was constructed in the process simulation software, and the operating conditions were optimized with the economic evaluation as the reference. The calculation results show that the annual average cost of the absorption-hydration process is 12% lower than that of the traditional absorption method. At the same time, it is found that, Although hydrates can recover low concentration of C _ 2 effectively, for high concentration C _ 2, hydrates can not provide high selectivity due to their internal macroporous structure. This paper discusses the development direction of chemical engineering, including more advanced modeling tools, global optimization, computational fault tolerance and parallel computing, and proposes a framework for global optimization of thermally coupled processes, which includes parallel global optimization algorithms. The simplified operation unit model, the gradient boundary method to help the convergence of the process and the analysis of the carrying point, etc., are suitable for the optimization of complex thermal coupling systems.
【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TQ028.1

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