汽油加氢装置脱碳九塔精馏过程的分析和优化

采用高效规整填料提高裂解汽油加氢装置脱碳九塔分离效果和C8芳烃收率。为解决分离效果问题在开车过程对填料塔的精馏过程建立模型,推算出适宜的回流比和塔釜温度。同时提出优化操作的方案,并在实际中得到应用。     

轻重汽油分离与吸收稳定耦合流程的研究

为选取一种轻重汽油分离与吸收稳定耦合的最佳流程,提出吸收稳定系统前串入轻重汽油分离塔工艺(方案1)、吸收稳定系统后串入轻重汽油分离塔(重汽油作为补充吸收剂)工艺(方案2)和吸收稳定系统后串入轻重汽油分离塔(稳定汽油作为补充吸收剂)工艺(方案3)三种方案,并用PROⅡ对方案进行流程模拟计算。模拟计算结果表明,方案3总冷负荷比前两种方案小了11.8%和0.4%,总热负荷比前两种方案小了18%和13%,再通过吸收塔塔板负荷比较,得出方案3为最佳方案;并对方案3两种换热流程的能耗比较,选择较优的换热流程。     

裂解汽油加氢预分馏系统非正常工况分析及设计优化

裂解汽油加氢装置预分馏系统主要包括脱碳五塔、脱碳八塔.实际生产中,在非正常工况下会遇到如开车阶段或夏季粗裂解汽油进料中碳四轻烃含量容易超标、脱碳八塔塔釜双环戊二烯在较高温度下分解以及易聚合组分在高温下聚合结焦堵塞等问题.这些问题会引起塔的操作波动、影响产品质量,严重时会导致塔超压或影响到塔的长周期运行.针对实际中遇到的...     

丙烷脱氢装置中产品分离塔操作要点浅析

针对丙烷脱氢装置产品分离塔的特点,提出了产品分离塔的操作原则;结合实际开车过程中遇到的问题,进一步探讨了产品分离塔的操作要点,为今后丙烷脱氢装置中产品分离塔及相关精馏装置的操作运行提供了建设性意见。     

催化汽油分馏工艺探讨

结合某炼油厂催化车间的实际情况 ,对该装置的分馏系统、吸收 -稳定系统进行了技术改造。即通过对催化分馏塔增加重汽油抽出流程、分馏塔顶部油气分级冷凝工艺 ;对稳定塔增加轻汽油抽出流程、稳定塔底部再沸器增加重汽油抽出流程等技术措施 ,可实现轻重汽油的初步分离 ,达到降硫降烯烃的目的 ,有效地减少了额外增加汽油分馏塔所消耗的能量。     

催化裂化粗汽油稳定塔设计和操作中若干问题的分析

一 前言 催化裂化装置的粗汽油稳定塔应脱除粗汽油进料中的C_4及其以前馏分,所得的塔顶液态烃将送到气体分馏部分作进一步分离,制取丙烷、丙烯,丁烯-2等化工原料;塔底的稳定汽油除出装置作为成品汽油外,尚有一部分回吸收塔作循环吸收剂用。显然,该塔的正确设计     

重整装置二甲苯塔增开侧线的方案比较

利用Aspen软件对天津分公司重整装置二甲苯塔增开侧线采出进行了模拟,对塔顶产品纯度、侧线采出油及塔底油性质及装置能耗进行了比较,结果表明,重整装置二甲苯塔增加侧线气相采出,塔顶产品纯度符合要求,侧线汽油馏分符合汽油标准,可作为汽油调合组分使用,与增加重芳烃分离塔的工艺流程相比流程简单,每小时可以节省3.5 MPa蒸气6.5 t,年可节省费用1 400万元。     

乙烯装置汽油分馏塔的技术改造

1 概述汽油分馏塔是裂解气进入分离工段的第一个塔,是乙烯装置的咽喉部位。我国引进乙烯装置的汽油分馏塔大部分为板式塔。在实际生产中,这些塔的压力降大、生产能力也较低。与板式塔相比,填料塔具有通量大、压降小、效率高和滞料量小等优点。为增加产量和     

扬子40万t乙烯装置有关塔高压差的分析与对策

针对扬子石化40万t乙烯改扩建装置投料开车以来,汽油分馏塔(DA101)、脱乙烷塔(DA401)、凝液汽提塔(DA202)、双塔脱丙烷等系统出现的高压差液泛的问题加以分析讨论。     

低温甲醇洗装置甲醇水分离塔的分析及改造

文章简单介绍了神华宁煤50万t/a煤基烯烃项目低温甲醇洗装置中甲醇水分离塔的工艺原理和作用,分析了甲醇水分离塔的正常运行对于低温甲醇洗装置的重要意义。分析了甲醇水分离塔在正常操作以及大检修后重新开车的操作注意事项,对装置中出现的甲醇水分离塔塔盘结垢问题进行了处理,并根据最终处理结果,针对性的制定了预防措施,有效解决了甲醇水分离塔的塔盘结垢问题,对整个低温甲醇洗装置的长周期运行提供了保障。     

板式精馏塔开工动态过程的研究

本文从描述塔板上物料衡算的差分-微分方程出发,导出了在全回流封闭操作条件下,当塔顶、塔板和塔底均有存料时开工过程的数学模型并求出其解.根据数学解还证明了板式精馏塔在开工过程中存在着恒浓度点.在一个具有七块塔板,直径为0.17m的筛板塔上对水-乙酸物系进行了开工过程的实验.本文公式的计算值与实验数据较好的吻合并证明了塔内恒浓度点的存在.     

START-UP PROCESS DYNAMICS OF PLATE DISTILLATION COLUMNS

A mathematical model for discribing the start-up period of a plate distillation column operating undertotal reflux is presented.Based on the differential-difference equation expressing the material balance onthe trays in a complete column with holdups in the reboiler,trays and condenser,the present model isderived and an analytical solution is obtained.The existence of a constant concentration point during thestart-up period is proved mathematically.Experimental work on start-up period is carried out in a seven sieve tray distillation column of 0.17meter in diameter with a water-acetic acid system.Good agreement is found between the experimentaldata and the calculated results.The experimental results also show the evidence of a constant concentra-tion point in the column during start-up period.     

多组元精馏开工动态过程的模拟

本文对多组元物系板式塔精馏在塔顶、塔板和塔釜均有存料情况下的开工动态过程进行了模拟计算和实验研究.结果表明,计算值与实验值基本相符.     

Time optimal start-up strategies for reactive distillation columns

In this contribution, a rigorous process model to simulate the start-up of a cold and empty reactive distillation (RD) column is developed and experimentally validated with a transesterification process. Strategies for time optimal start-up of an RD column are presented. The mostly used strategy for conventional distillation of total reflux for RD is only recommendable with limitations. New, alternative strategies, like the recycling of the off-spec bottom and top product or the initial charging with product, to minimize the necessary start-up time are presented. Suitable strategies can save up to 82% of the needed time for the column start-up.     

芳烃抽提装置抽提部分开工过程的优化

广州乙烯芳烃抽提装置抽提部分的开车应用了优化的开车步骤。抽提塔及抽余油水洗塔停工不退料,一来减少了抽余油在抽提塔及加余油水洗塔的累积时间,二来缩短了开车时间,减少了不合格抽提油的采出量,解决了湿溶剂罐小的难题。     

SOME CHARACTERISTICS OF PACKED COLUMN FOR CLOSE-BOILING FRACTIONATION

One of the important characteristics of a close-boiling fractionating column is the requirement ofmuch longer start-up time,and consequently the search for ways to minimize such time have been receivedmuch concern and attention.The conventional method of starting up a column is under the conditionof constant vapor velocity,while in this paper,the authors propose another way of operation,i.e.start-up with stepwise lowering of vapor velocity.The mathematical models of these two methods of start-upare developed and solved to obtain the analytical solutions of exponential type to represent the unsteadyconcentration profiles.The derived equations are in agreement with the experimental data.Both theoreti-cal study and experimental work show that,when the same final concentration is reached,the start-uptime for the proposed operation is shorter than that for the conventional.     

START UP AND DYNAMIC PROCESSES SIMULATION OF A DISTILLATION COLUMN

A new dynamic non-equilibrium mixing-pool model for simulating start-up and dynamic re-sponse of a distillation column is reported.The proposed model is established on the basis ofconsidering the two dimensional flow/mixing behavior of actual trays in a distillation column.Com-parison is made among the computed results of the start-up time and the dynamic response time bythe proposed and five other typical models.It is found that the computed time for both dynamicprocesses is longer by the model which considers any flow/mixing pattern than by the model withoutsuch concern.The inertia effect of flow/mixing seems to be important and can not be ignored inmodeling the transient process of distillation.The proposed model,which is believed to be suitableto large column,seems somewhat useful in predicting industrial distillation dynamics.     

A generalized model for distillation columns—I: Model description and applications

A generalized model for the dynamic simulation of distillation columns is presented. The model allows the solution of a wide variety of problems, from open- closed-loop responses of single (and multiple) columns to operability studies (of feed changeover and start-up operations) and column instability studies (effect of plate hydraulics during transient operations). Results are given for single columns (including industrial) as well as multiple columns for different types of operations. The problems include thermodynamically close to ideal systems to highly nonideal systems. Efficient and robust numerical integrators are used to obtain reliable solutions even for difficult discontinuous operations.     

空分精馏塔液泛的原因及处理

河南神马尼龙化工有限责任公司动力厂KDON-3500／3200／150型空分装置采用的是全低压分子筛净化工艺,精馏塔采用的是筛板塔。在2007年5月装置大修后的开车过程中,精馏塔发生严重液泛,通过对膨胀机密封气系统的技术改造,并根据上塔阻力变化情况及时控制和调整生产负荷及膨胀气量,缩短液氧吸附器的再生周期以及经常对主冷进行液氧置换,外购液氧以弥补装置产氧量不足等措施,成功避免了装置停车加温。