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《石化技术与应用》[ISSN:1009-0046/CN:62-1138/TQ]

期数:

2025年1期

页码:

68-73

栏目:

出版日期:

2025-01-10

文章信息/Info

Title:

Operational problems and countermeasures in the start-up of xylene separation unit

文章编号:

1009-0045（2025）01-0068-06

作者:

李松; 向小波

（中国石化荆门分公司 炼油一部，湖北 荆门448000）

Author(s):

LI Song; XIANG Xiao-bo

（1st Refinery Department of Jingmen Company ，SINOPEC，Jingmen 448000，China）

关键词:

二甲苯; 分离; 二甲苯塔; 脱庚烷塔; Aspen Plus软件; 乙苯

Keywords:

xylene; separation; xylene tower; deheptanizer tower; Aspen Plus software; ethylbenzene

分类号:

TQ 241.13

DOI:

DOI：10.19909/j.cnki.ISSN1009-0045.2025.01.0068

文献标识码:

B

摘要:

介绍了中国石化荆门分公司二甲苯分离装置首次开工情况，利用Aspen Plus流程模拟软件对装置运行中存在的问题进行了分析，并提出相应对策。结果表明：以C≥7组分为原料，通过优化二甲苯分离装置油运流程，增设二甲苯塔泄压流程，脱庚烷塔采取降压操作等措施，可实现装置一次开工成功；装置出现二甲苯塔液位波动，产品质量异常，二甲苯塔超压等问题的原因为二甲苯塔液相负荷过低，低负荷下脱庚烷塔釜压力下降，二甲苯塔气相馏出物冷却器冷侧热媒水出现汽阻。通过采取将二甲苯塔回流量提至25 t/h，脱庚烷塔塔釜温度升至187.5 ℃，二甲苯塔塔顶热媒水出冷却器温度降至120 ℃以下的优化措施后，装置可以平稳运行，二甲苯产品中乙苯质量分数降至18.6%以内，可满足产品指标要求。

Abstract:

First operation of the xylene separation unit of Jingmen Company，SINOPEC，was introduced， the problems during the unit′s operation was analyzed using Aspen Plus process simulation software， and the countermeasures were proposed.The results showed that using C≥7 components as raw materials， by optimizing the oil transportation process of the xylene separation unit， the unit could be successfully started by adding a xylene tower pressure relief process， and taking pressure reduction measures for the deheptane tower.The reasons for the fluctuation of liquid level in the xylene tower， abnormal product quality， and overpressure in the xylene tower were that the liquid phase load of the xylene tower was too low， the pressure in the heptane removal tower kettle decreased under low load， and the cold side heat medium water of the xylene tower gas phase distillate cooler experienced steam resistance. After taking optimization measures to increase the reflux rate of the xylene tower to 25 t/h， raised the temperature of the heptane removal tower kettle to 187.5 ℃， and lower the temperature of the heat medium water outlet cooler at the top of the xylene tower to below 120 ℃， the device could operate smoothly， and the mass fraction of ethylbenzene in the xylene product could be reduced to within 18.6%， which could meet the product requirements.

参考文献/References

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更新日期/Last Update: 2025-01-10