發(fā)布時(shí)間：2018-02-09 11:03

  本文關(guān)鍵詞： 煉廠干氣 乙烯回收 流程模擬 深冷 吸收 水合物　出處：《天津大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：煉廠干氣主要是催化裂化、延遲焦化等過程中產(chǎn)生的氣體,其中催化裂化的產(chǎn)率最高,產(chǎn)量最大。干氣的主要成分包括氫氣、氮?dú)�、氧氣、甲烷、乙烷、乙烯等。在傳統(tǒng)原油加工中,干氣常常作為燃料并入火炬管網(wǎng),造成了資源的很大浪費(fèi)。本文首先對(duì)現(xiàn)有的干氣回收C2的工藝方法進(jìn)行了介紹,確立了流程模擬的邊界條件以及經(jīng)濟(jì)性評(píng)價(jià)方法,進(jìn)而分別比較了深冷法和吸收法的年平均費(fèi)用。對(duì)于深冷分離方法,本文建立了深冷法回收煉廠干氣中C2的流程模擬,并對(duì)其合適的操作壓力進(jìn)行了分析。接著,將深冷回收干氣中的C2與深冷分離裂解氣中C2進(jìn)行了比較。對(duì)于吸收分離方法,本文分析了現(xiàn)有吸收法分離C2的優(yōu)勢(shì)和存在的問題,提出了一種回收高純度C2的三塔流程,并分析了分別采用C4、C5、C6作為吸收劑時(shí)能耗最低流程的操作參數(shù),包括吸收溫度、吸收壓力、吸收劑流量、吸收塔理論板數(shù)、解吸塔理論板數(shù)、精餾塔理論板數(shù)等;然后比較了三種吸收劑的效果和能耗情況,發(fā)現(xiàn)C5要優(yōu)于其他兩種吸收劑。接下來以C5吸收為例,對(duì)吸收溫度、吸收壓力以及吸收劑流量進(jìn)行了正交分析,確定了這三個(gè)主要操作參數(shù)對(duì)于回收率以及能耗的影響大小順序。在優(yōu)化了吸收法的操作條件后,對(duì)吸收法和深冷法進(jìn)行了經(jīng)濟(jì)性比較,發(fā)現(xiàn)吸收法的年平均費(fèi)用比深冷法高約3%。本文還闡述了水合-吸收法耦合法回收干氣中高純度C2的基本概念,建立了水合反應(yīng)器的熱力學(xué)平衡模型,并且用Aspen Custom Modeler進(jìn)行了編程和驗(yàn)證。結(jié)果表明水合反應(yīng)器的模擬結(jié)果與文獻(xiàn)報(bào)道值比較接近。在此基礎(chǔ)上建立了水合-吸收法回收干氣中C2的基本流程。
[Abstract]:Refinery dry gas is mainly catalytic cracking, delay coking gas generated in the process, the catalytic cracking of the highest yield and the maximum yield. The main components of dry gas including hydrogen, nitrogen, oxygen, methane, ethane, ethylene and so on. In the traditional processing of crude oil, dry gas as fuel into the torch often caused a large network a waste of resources. This paper first process method of the existing dry gas recovery of C2 were introduced, established the process simulation of boundary conditions and the method of economic evaluation, the average annual cost and compare the cryogenic method and absorption method for cryogenic separation method, this paper established C2 gas flow simulation of cryogenic dry method recovery of refinery, and the suitable operating pressure was analyzed. Then, the cryogenic recovery in dry gas cryogenic separation of pyrolysis gas in C2 and C2 were compared. The absorption separation method, this paper analyzes the existing Absorption separation the advantage and disadvantage of the C2, proposed a recovery of high purity C2 three processes, and analyzed respectively by C4, C5, C6 as the absorbent of operating parameters of the lowest energy consumption process, including absorption absorption temperature, pressure, flow rate of absorbent, the absorption of Tali plate number, plate number theory of desorption tower the number of theoretical plates, distillation tower; then compare the effect and energy consumption of three kinds of absorbents, found that C5 is better than the other two kinds of absorbents. Then take C5 as an example to absorb, absorption temperature, were studied by orthogonal analysis of absorption pressure and flow rate of absorbent, to determine the impact of the three main operating parameters on the recovery rate and energy consumption the size of the order. In the optimization of the absorption operation conditions, the absorption and cryogenic method compared to the economy, found that the average annual cost absorption method than cryogenic high about 3%. this paper also illustrates the hydration and absorption method The coupling of basic concepts in the recovery of dry gas of high purity C2, a thermodynamic equilibrium model of hydration reactor, and programmed and verified using Aspen Custom Modeler. The results show that the simulation results of hydration reactor with the reported values are close. Set up on the basis of the basic process of hydration absorption recovery in dry gas C2.

【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ028

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