本文選題：內(nèi)部熱集成 + 反應(yīng)精餾　； 參考：《中國(guó)海洋大學(xué)》2015年碩士論文

【摘要】：反應(yīng)精餾塔是將化學(xué)反應(yīng)和產(chǎn)物分離耦合到一個(gè)塔中的典型的化工過(guò)程強(qiáng)化技術(shù)。內(nèi)部熱集成反應(yīng)精餾將內(nèi)部熱集成概念應(yīng)用于反應(yīng)精餾塔中,將傳統(tǒng)的反應(yīng)精餾塔分割為兩個(gè)獨(dú)立的塔,并在不同的壓力下操作,兩塔之間通過(guò)塔壁、換熱翅片等換熱介質(zhì)進(jìn)行熱量交換,通過(guò)熱量的內(nèi)部集成來(lái)提高能量的利用效率,降低系統(tǒng)能耗和費(fèi)用。本文建立了一種內(nèi)部熱集成反應(yīng)精餾塔設(shè)計(jì)的方法,并將方法應(yīng)用于環(huán)氧乙烷水合反應(yīng)體系,對(duì)其進(jìn)行了內(nèi)部熱集成反應(yīng)精餾塔的設(shè)計(jì)。(一)建立一種內(nèi)部熱集成反應(yīng)精餾塔設(shè)計(jì)的方法。(1)對(duì)傳統(tǒng)的反應(yīng)精餾塔進(jìn)行設(shè)計(jì),然后將反應(yīng)精餾塔分割至兩個(gè)獨(dú)立的塔中,并且在不同的壓力下操作,然后對(duì)兩塔分割后塔內(nèi)的溫度分布進(jìn)行內(nèi)部熱集成熱力學(xué)可行性分析；(2)選擇合適的塔結(jié)構(gòu),根據(jù)塔的流程參數(shù)及結(jié)構(gòu)特點(diǎn)選擇合適的換熱位置和換熱量設(shè)計(jì)方法,設(shè)計(jì)內(nèi)部熱換熱量；(3)研究塔內(nèi)的物理空間條件,通過(guò)計(jì)算塔內(nèi)能提供的換熱面積,并與換熱所需的換熱面積進(jìn)行比較,對(duì)塔進(jìn)行水力學(xué)可行性分析。(4)調(diào)整塔結(jié)構(gòu)或改變內(nèi)部換熱量,使水力學(xué)達(dá)到可行,完成內(nèi)部熱集成反應(yīng)精餾塔的設(shè)計(jì)。(二)將建立方法應(yīng)用到環(huán)氧乙烷水合體系中,分別設(shè)計(jì)了同心軸式內(nèi)部熱集成反應(yīng)精餾塔(同心軸式塔)和多管式內(nèi)部熱集成反應(yīng)精餾塔(多管式塔)。(1)首先以理想內(nèi)部熱集成(再沸器負(fù)荷為零)為目標(biāo),以等換熱量設(shè)計(jì)的方法,設(shè)計(jì)了EO水合反應(yīng)的同心軸式塔,然后對(duì)塔進(jìn)行了水力學(xué)分析,發(fā)現(xiàn)由于達(dá)到再沸器負(fù)荷為零需要的換熱量非常大,塔內(nèi)空間不足以提供內(nèi)部換熱所需的換熱面積,水力學(xué)不可行。然后研究了塔內(nèi)換熱量對(duì)塔內(nèi)溫度、汽液相流量、塔徑、塔負(fù)荷等的影響,結(jié)果表明,降低塔內(nèi)換熱量可以解決理想內(nèi)部熱集成水力學(xué)不可行的問(wèn)題。因此降低了塔內(nèi)換熱量,以水力學(xué)可行前提下的最大內(nèi)部熱集成為目標(biāo),設(shè)計(jì)了EO水合體系同心軸式部分內(nèi)部熱集成反應(yīng)精餾塔。通過(guò)能耗分析發(fā)現(xiàn)同心軸式塔比傳統(tǒng)反應(yīng)精餾塔節(jié)省能耗達(dá)29%。(2)設(shè)計(jì)了多管式部分內(nèi)部熱集成反應(yīng)精餾塔。內(nèi)塔分為41個(gè)塔徑為0.4m的小塔時(shí)負(fù)荷設(shè)計(jì)規(guī)定,比傳統(tǒng)反應(yīng)精餾塔節(jié)能約13.5%。(3)分別對(duì)傳統(tǒng)反應(yīng)精餾塔、同心軸式塔和多管式塔進(jìn)行了經(jīng)濟(jì)性評(píng)價(jià),結(jié)果表明,同心軸式塔與多管式塔年度費(fèi)用相差不大,同心軸式塔年度費(fèi)用略低于多管式塔0.9%。與傳統(tǒng)反應(yīng)精餾塔相比,同心軸式塔和多管式塔能大約節(jié)省達(dá)63%的年度總費(fèi)用。本文建立的方法,將為內(nèi)部熱集成反應(yīng)精餾塔的設(shè)計(jì)優(yōu)化提供理論指導(dǎo)和模型支持,特別是考察水力學(xué)的內(nèi)部熱集成反應(yīng)精餾塔的設(shè)計(jì)提供方法借鑒。
[Abstract]:The reaction distillation column is a typical chemical process strengthening technology which combines chemical reaction and product separation into a single column. Internal thermal integration reactive distillation applies the concept of internal thermal integration to the reaction distillation column. The traditional reactive distillation column is divided into two separate columns and operated under different pressures, and the two columns pass through the tower wall. In order to improve the energy efficiency and reduce the energy consumption and cost of the system, heat transfer media such as fin is used to exchange heat, and the internal integration of heat is used to improve the efficiency of energy utilization. In this paper, a design method of internal thermal integrated reaction distillation column is established. The method is applied to ethylene oxide hydration reaction system, and the internal thermal integrated reaction distillation column is designed. (1) to establish a method for the design of an internal thermal integrated reaction distillation column. (1) to design the traditional reactive distillation column, and then divide the reaction distillation column into two separate columns and operate under different pressures. Then, the thermodynamics feasibility analysis of internal thermal integration is carried out on the temperature distribution in the tower after the two towers are separated. (2) the appropriate tower structure is selected, and the appropriate heat transfer position and heat transfer design method are selected according to the flow parameters and structural characteristics of the tower. The physical space conditions in the tower are studied, and the heat transfer area provided by the tower is calculated and compared with the heat transfer area required by the heat transfer. The hydraulic feasibility analysis of the tower. 4) adjust the tower structure or change the internal heat transfer to make the hydraulics feasible and complete the design of the inner thermal integrated reaction distillation column. (II) the application of the established method to the ethylene oxide hydration system, First, the ideal internal thermal integration (zero reboiler load) is the goal of the design of the concentric inner thermal integrated reaction distillation column (concentric column) and the multi-tube internal thermal integrated reaction distillation column (multi-tube tower. The concentric column of EO hydration reaction was designed by the method of equal heat transfer design, and the hydraulic analysis of the tower was carried out. It was found that the heat transfer needed to reach zero load of the reboiler was very large. The space in the tower is not enough to provide the heat transfer area needed for internal heat transfer, and hydraulics is not feasible. Then, the effects of heat transfer in the tower on the temperature in the tower, the flow rate of steam and liquid phase, the diameter of the tower and the load of the tower are studied. The results show that reducing the heat transfer in the tower can solve the problem that the ideal internal heat integration hydraulics is not feasible. Therefore, the heat transfer in the column is reduced, and aiming at the maximum internal thermal integration under the condition of hydraulics feasibility, the concentric partial internal thermal integration reaction distillation column of EO hydration system is designed. Through energy consumption analysis, it is found that the energy saving of the concentric column is up to 29. 2) the multi-tube partial internal thermal integrated reaction distillation column is designed. The inner tower is divided into 41 small towers with a diameter of 0.4m, which is designed for hourly load, which saves energy about 13.53.The conventional reactive distillation tower, concentric column and multi-tube tower are evaluated respectively. The results show that, The annual cost of concentric tower is slightly lower than that of multi-tube tower, and the annual cost of concentric tower is slightly lower than that of multi-tube tower. Compared with traditional reaction distillation column, the annual total cost of concentric column and multi-tube column can be reduced by 63%. The method established in this paper will provide theoretical guidance and model support for the design and optimization of the inner thermal integrated reaction distillation column, especially for the study of the design of the internal thermal integrated reaction distillation column in hydraulics.
【學(xué)位授予單位】：中國(guó)海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ053.5

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