|本期目录/Table of Contents|

[1]张海峰,徐洪君,赵越.催化重整稳定塔铵盐堵塞原因分析及在线处理措施[J].石化技术与应用,2023,6:481-485.
　ZHANG HAI-feng,XU Hong-jun,ZHAO Yue.Cause analysis of ammonium salt blockage and on-line treatment measures of catalytic reforming stabilization tower[J].Petrochemical technology & application,2023,6:481-485.
点击复制

催化重整稳定塔铵盐堵塞原因分析及在线处理措施(PDF)

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

期数:
2023年6期
页码:
481-485
栏目:
出版日期:
2023-11-10

文章信息/Info

Title:
Cause analysis of ammonium salt blockage and on-line treatment measures of catalytic reforming stabilization tower
文章编号:
1009-0045（2023）06-0481-05
作者:
张海峰; 徐洪君; 赵越
中国石化青岛石油化工有限责任公司 ，山东 青岛 266043
Author(s):
ZHANG HAI-feng; XU Hong-jun ; ZHAO Yue
Qingdao Petrochemical Co Ltd，SINOPEC，Qingdao 266043，China
关键词:
固定床半再生催化重整装置; 稳定塔; 氮含量; 水氯平衡; 结晶氯化铵; 塔盘堵塞; 在线注除氧水清洗
Keywords:
fixed bed semi-regenerative catalytic reforming unit; stabilization tower; nitrogen content; water-chlorine balance; ammonium chloride crystal; tray blockage; on-line deoxygenated water injection &;  cleaning
分类号:
TE 624.4；TE 985.9；TE 966
DOI:
DOI：10.19909/j.cnki.ISSN1009-0045.2023.06.0481
文献标识码:
B
摘要:
针对25万t/a固定床半再生催化重整装置重整单元稳定塔运行中出现的塔顶温度频繁超出设计指标（65 ℃）且异常大幅波动、造成液化气中C5组分体积分数远超指标（不大于5.0%）的问题，进行了原因分析，并实施了相应措施。结果表明：一旦精制石脑油原料中氮含量高的情况频发，氮化物杂质在重整反应过程中会生成NH3，当遇到系统中全氯型重整催化剂活性组分复合物在潮湿环境下水解失氯形成的HCl，便会结合生成大量NH4Cl，并在低于220 ℃下结晶且不溶于重整油，之后再夹带系统中的其他固体杂质结晶、沉积，造成设备的铵盐堵塞与腐蚀。在重整装置不停工的前提下，对因铵盐堵塞的稳定塔塔盘及浮阀实施在线注除氧水（溶解氧含量不大于15 μg/L）洗塔处理措施，可有效除去NH4Cl混合结晶物，恢复提高塔盘的分离效果，保障液化气产品质量合格及装置的平稳长周期运行。
Abstract:
Aiming at the problem that the tower top temperature frequently exceeded the design index of 65 ℃ and abnormally fluctuated wildly during the operation of the stabilization tower of the 250 kt/a fixed bed semi-regenerative catalytic reforming unit，which resulted in the volume fraction of C5 components in the liquefied petroleum gas（LPG） product far exceeding the index of not more than 5.0%，the causes were analyzed and the corresponding measures were implemented. The results showed that： once the nitrogen content in refined naphtha remained high frequently，the nitride impurities would generate NH3 during the reforming reaction，when encountering HCl formed by the hydrolysis and loss of chlorine in the active component complex of the chlorine-promoted reforming catalyst in the system under the humid environment，they would combine and generate a large amount of NH4Cl，which would crystallize below 220 ℃ and be insoluble in the reforming oil. Then such NH4Cl carried other solid impurities in the system and further crystallized and sedimented，finally resulting in the ammonium salt blockage & corrosion of the equipment and its accessories. On the premise that the reforming unit was not shut down，the trays and float valves of the stabilization tower blocked by ammonium salt were cleaned by the on-line injection of the deoxygenated water （its dissolved oxygen content not more than 15 μg/L）. By doing so，the mixed NH4Cl crystal sediments were effectively removed，the separation effect of the stabilization tower tray could be restored and improved，and the quality of LPG product and the stable，long-term operation of this unit could be ensured.

参考文献/References

［1］ 张大庆，张玉红，臧高山，等. 半再生重整技术的现状及发展［J］. 石油炼制与化工，2007，38（12）： 11-13.［2］ 张海峰. 半再生重整装置能耗分析与节能措施［J］. 石化技术与应用，2008，26（5）： 471-473.［3］ 刘仁旭. 催化重整装置降压操作对产品的影响［J］. 石油炼制与化工，2006，37（12）：23-25.［4］ 孙来周. 优化重整操作挖掘重整潜力［J］. 石化技术，2005，12（4）： 28-31.［5］ 李莜. 催化重整装置提高效益的措施［J］. 炼油与化工，2021，32（3）： 21-25.［6］ 王辉. 原料氮含量偏高对催化重整装置的影响及对策［J］. 中外能源，2014，19（4）： 71-74.

备注/Memo

备注/Memo:
-
更新日期/Last Update: 2023-11-10