回收炼厂干气中高浓度C2工艺开发及经济性评价

发布时间：2018-02-09 11:03

本文关键词： 炼厂干气乙烯回收流程模拟深冷吸收水合物　出处：《天津大学》2015年硕士论文　论文类型：学位论文

【摘要】：炼厂干气主要是催化裂化、延迟焦化等过程中产生的气体,其中催化裂化的产率最高,产量最大。干气的主要成分包括氢气、氮气、氧气、甲烷、乙烷、乙烯等。在传统原油加工中,干气常常作为燃料并入火炬管网,造成了资源的很大浪费。本文首先对现有的干气回收C2的工艺方法进行了介绍,确立了流程模拟的边界条件以及经济性评价方法,进而分别比较了深冷法和吸收法的年平均费用。对于深冷分离方法,本文建立了深冷法回收炼厂干气中C2的流程模拟,并对其合适的操作压力进行了分析。接着,将深冷回收干气中的C2与深冷分离裂解气中C2进行了比较。对于吸收分离方法,本文分析了现有吸收法分离C2的优势和存在的问题,提出了一种回收高纯度C2的三塔流程,并分析了分别采用C4、C5、C6作为吸收剂时能耗最低流程的操作参数,包括吸收温度、吸收压力、吸收剂流量、吸收塔理论板数、解吸塔理论板数、精馏塔理论板数等;然后比较了三种吸收剂的效果和能耗情况,发现C5要优于其他两种吸收剂。接下来以C5吸收为例,对吸收温度、吸收压力以及吸收剂流量进行了正交分析,确定了这三个主要操作参数对于回收率以及能耗的影响大小顺序。在优化了吸收法的操作条件后,对吸收法和深冷法进行了经济性比较,发现吸收法的年平均费用比深冷法高约3%。本文还阐述了水合-吸收法耦合法回收干气中高纯度C2的基本概念,建立了水合反应器的热力学平衡模型,并且用Aspen Custom Modeler进行了编程和验证。结果表明水合反应器的模拟结果与文献报道值比较接近。在此基础上建立了水合-吸收法回收干气中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.

【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028

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