本文選題：空分過(guò)程 + 全聯(lián)立　； 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：空分過(guò)程是將空氣進(jìn)行分離,得到高純度氧、氮、氬等工業(yè)氣體的分離過(guò)程,其產(chǎn)品廣泛應(yīng)用于化工、石油、冶金、電子、能源、醫(yī)療保健、航空航天等各工業(yè)領(lǐng)域,對(duì)國(guó)民經(jīng)濟(jì)有著重要的作用。作為復(fù)雜的化工過(guò)程,空分具有產(chǎn)品純度高、設(shè)備耦合多、關(guān)聯(lián)性強(qiáng)等特點(diǎn),給流程的模擬和優(yōu)化帶來(lái)了較大困難,選擇適合的求解方法顯得至關(guān)重要。聯(lián)立方程法具有求解速度快、收斂性能好、模擬優(yōu)化問(wèn)題切換方便的優(yōu)點(diǎn),在化工過(guò)程的模擬優(yōu)化中有著廣闊的發(fā)展和應(yīng)用前景。本文針對(duì)空分模型的變量耦合嚴(yán)重、非線性強(qiáng)、方程變量維數(shù)高的問(wèn)題,以聯(lián)立方程法為基礎(chǔ),分別對(duì)空分過(guò)程的機(jī)理建模、模擬和優(yōu)化展開(kāi)研究。本文的主要貢獻(xiàn)有：1、選擇適合計(jì)算空分深冷體系的熱力學(xué)物性計(jì)算方法PR和RKS-BM,并實(shí)現(xiàn)了三次狀態(tài)方程法的全聯(lián)立求解,將熱力學(xué)模型融入空分機(jī)理模型,替代了常規(guī)化工模擬軟件內(nèi)嵌序貫算法的復(fù)雜計(jì)算過(guò)程。2、基于空分塔的機(jī)理模型,設(shè)計(jì)了物性參數(shù)估計(jì)的優(yōu)化命題,得到了準(zhǔn)確的二元交互參數(shù),并探究了內(nèi)嵌序貫算法和全聯(lián)立計(jì)算方法在迭代過(guò)程中的差異,驗(yàn)證了聯(lián)立方程法在收斂性能上的優(yōu)勢(shì)。3、針對(duì)Aspen Plus模擬空分過(guò)程時(shí)收斂性差的問(wèn)題,提出將全聯(lián)立方法用于空分過(guò)程的模擬與優(yōu)化。聯(lián)立的范圍包括物性計(jì)算模型和單元機(jī)理模型,實(shí)現(xiàn)了全流程的聯(lián)立求解。在變工況下對(duì)流程進(jìn)行模擬,采用了相同的初值設(shè)定,使模型實(shí)現(xiàn)秒級(jí)收斂,并證明了模型的準(zhǔn)確性。4、研究了空分過(guò)程中操作條件和約束的重要性,設(shè)計(jì)了以能耗、收入為目標(biāo)的優(yōu)化命題,通過(guò)研究變負(fù)荷優(yōu)化前后各操作變量的變化趨勢(shì),得出了規(guī)律性的結(jié)論。并基于全聯(lián)立模型,對(duì)收斂域、熱耦合變化等進(jìn)行了深入研究。
[Abstract]:Air separation process is the separation process of high purity oxygen, nitrogen, argon and other industrial gases. Its products are widely used in chemical industry, petroleum, metallurgy, electronics, energy, health care, aerospace and other industrial fields.It plays an important role in the national economy.As a complex chemical process, air separation has the characteristics of high product purity, more equipment coupling, strong correlation and so on, which brings great difficulties to process simulation and optimization, so it is very important to select suitable solution methods.Simultaneous equation method has the advantages of fast solving speed, good convergence performance and convenient switching of simulation optimization problem. It has a broad development and application prospect in chemical process simulation optimization.In order to solve the problem of severe coupling of variables, strong nonlinearity and high dimension of equation variables, the mechanism modeling, simulation and optimization of air separation process are studied based on simultaneous equation method in this paper.The main contribution of this paper is to choose the thermodynamic physical property calculation methods PR and RKS-BM, which are suitable for calculating the cryogenic system of air separation, and realize the full simultaneous solution of the cubic equation of state method, and incorporate the thermodynamic model into the air separation mechanism model.Instead of the complex calculation process of embedded sequential algorithm in conventional chemical simulation software. Based on the mechanism model of air separation tower, the optimization proposition of physical property parameter estimation is designed, and the accurate binary interactive parameters are obtained.The difference between the embedded sequential algorithm and the full simultaneous calculation method in the iterative process is discussed, and the convergence performance of the simultaneous equation method is verified. 3. Aiming at the problem of poor convergence in the simulation of air separation process by Aspen Plus,In this paper, the simultaneous method is applied to the simulation and optimization of air separation process.The range of simultaneous operation includes physical property calculation model and unit mechanism model, which realizes simultaneous solution of the whole process.The process is simulated under variable working conditions, the same initial value is used to make the model converge in second order, and the veracity of the model is proved. Finally, the importance of operating conditions and constraints in air separation process is studied, and the energy consumption is designed.By studying the changing trend of operating variables before and after variable load optimization, the conclusion of regularity is obtained.Based on the model, the convergence domain and thermal coupling are studied.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ116.11

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 趙慕愚,萬(wàn)強(qiáng),宋利珠,馮守華;恒壓相圖的邊界理論及其應(yīng)用[J];大學(xué)化學(xué);2005年03期

2 李德新;姜波;任奕丞;祝鈴鈺;蔣鵬飛;周立芳;;基于集合算法的高純度精餾塔分段建模方法[J];化工學(xué)報(bào);2012年09期

3 錢(qián)嘉林;葉泳恒;;多效精餾原理及應(yīng)用[J];石油化工;1990年09期

相關(guān)博士學(xué)位論文 前1條

1 祝鈴鈺;復(fù)雜分離過(guò)程模擬與優(yōu)化中的若干問(wèn)題研究[D];浙江大學(xué);2009年

相關(guān)碩士學(xué)位論文 前1條

1 孫宗偉;熱耦合精餾的適應(yīng)性及其熱力學(xué)效率[D];大連理工大學(xué);2008年

，

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