本文選題：間壁精餾塔 + 間壁換熱　； 參考：《北京化工大學(xué)》2015年碩士論文

【摘要】：精餾操作是化學(xué)工業(yè)中應(yīng)用的最為廣泛的分離操作,但是它在一個工業(yè)流程中也是最為消耗能量的操作過程。間壁精餾塔作為一種提升過程能效的精餾塔在提出之初就被廣為關(guān)注。但是,現(xiàn)有的間壁精餾塔研究中,并沒有考慮到間壁兩側(cè)的傳熱過程；所以考慮到間壁傳熱的間壁精餾塔在能耗及經(jīng)濟效益上任然存在改進及提升的空間,這就是本論文的主要研究問題。本文建立了考慮間壁熱量耦合的嚴格平衡級模型,并在模型的基礎(chǔ)上,考慮了間壁傳熱過程。研究發(fā)現(xiàn),在BTX體系中,考慮間壁兩側(cè)的熱量耦合之后,以進料板為界,不同位置的熱量耦合過程,對精餾塔的再沸器負荷的影響,其中包括積極的和消極的影響,并且根據(jù)不同塔板上的甲苯T濃度的變化情況,對再沸器負荷變化及其能耗變化做出了以下合理解釋：1、進料板之上的熱量耦合不利于節(jié)能過程,增加了再沸器的總負荷,應(yīng)當盡量避免：進料板之下的熱量耦合有利于節(jié)能過程,減少了再沸器的總負荷,在工程允許的范圍內(nèi),應(yīng)當盡量實現(xiàn)。2、間壁兩側(cè)的熱量耦合對于中間組成甲苯(T)組成的濃度變化影響較大,通過減少中間組成向塔頂及塔底分配量,即降低中間組成的返混程度即可達到節(jié)能的目的,這同間壁精餾塔的節(jié)能原理是一致的。3、以10萬噸／年的苯分離過程為例,通過進料之上避免換熱,進料板之下進行換熱,模擬結(jié)果顯示,一年可以節(jié)省1.OMpa的蒸汽3330噸。本文建立了考慮間壁熱量耦合的嚴格平衡級模型,但在熱量耦合形式及熱量耦合空間上仍然需要進一步研究,以和工業(yè)實際更加吻合。并且本文未考慮動態(tài)模擬過程的非線性情況對整個模型的影響,今后的研究可能會在熱量耦合形式及空間以及動態(tài)模型等方面進一步研究。
[Abstract]:Distillation is the most widely used separation operation in chemical industry, but it is also the most energy-consuming process in an industrial process.As a kind of distillation column for improving process energy efficiency, the interwall distillation column has been widely concerned since its inception.However, the existing research on the interwall distillation column does not take into account the heat transfer process on both sides of the interwall, so there is room for improvement and improvement in energy consumption and economic benefit of the interwall distillation tower considering the heat transfer of the interwall.This is the main research problem of this paper.In this paper, a strict equilibrium stage model considering the heat coupling between the walls is established, and the heat transfer process of the interwall is considered on the basis of the model.It is found that in the BTX system, considering the heat coupling between the two sides of the interwall, the heat coupling process in different positions, taking the feed plate as the boundary, affects the reboiler load of the distillation column, including positive and negative effects.And according to the change of toluene T concentration on different trays, the following reasonable explanation is given for the change of reboiler load and its energy consumption. The heat coupling on the feed plate is not conducive to the energy saving process and increases the total load of the reboiler.It should be avoided as far as possible: the heat coupling under the feed plate is beneficial to the energy saving process and reduces the total load of the reboiler to the extent permitted by the project,It should be realized as far as possible. The heat coupling on both sides of the interwall has a great influence on the concentration change of the intermediate component of toluene. By reducing the distribution of the intermediate component to the top and bottom of the tower, that is, reducing the degree of backmixing of the intermediate composition, the purpose of energy saving can be achieved.The energy saving principle of the interwall distillation column is consistent with that of .3. taking the benzene separation process of 100000 tons per year as an example, heat transfer is avoided over the feed and heat transfer is carried out under the feed plate. The simulation results show that the steam of 1.OMpa can be saved by 3330 tons per year.In this paper, a strict equilibrium order model considering the heat coupling between walls is established, but the heat coupling form and the heat coupling space still need to be further studied in order to be more consistent with the industrial practice.Moreover, the influence of nonlinear process on the whole model is not taken into account in this paper. The future research may be further studied in the form of heat coupling, space and dynamic model.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ053.5

【參考文獻】

相關(guān)期刊論文 前2條

1 楊友麒;熱偶精餾塔操作特性的模擬研究[J];化工學(xué)報;1990年04期

2 胡s，

本文編號：1768062