Abstract: The experience of dechlorination of dry gas at the top of post fractionation depentanizer and debutanizer in continuous reforming unit was summarized. Dechlorination was carried out by changing to fuel gas, adding water washing tower and adding dechlorination tank. The comparison results showed that the pipeline leakage and secondary accidents were easily caused by the outward delivery process. The change to fuel gas led to serious blockage of flame arrester, filter, nozzle and other parts, which increased the workload and affected the operation of heating furnace. The addition of water washing tower to hydrogen production unit resulted in serious salt formation of compressor air valve, which led to frequent failures and affected the normal production of the unit. After adding the dry gas dechlorination tank, the process could be selected according to the principle of benefit optimization to solve the influence of dry gas on subsequent equipment and effectively avoid the above problems. Through several results comparison of process optimization, adding dechlorination tank was one of the most effective ways to remove chlorine from dry gas, which could greatly solve the problem, alleviate the impact on the downstream unit, and ensure the safe and stable operation of the unit.

Key words: continuous reforming unit, depentanizer, debutanizer, dry gas, dechlorination tank

摘要： 对连续重整装置中后分馏脱戊烷塔与脱丁烷塔塔顶干气脱氯经验进行了总结。通过将干气改至燃料气总线、增上水洗塔、增上脱氯罐等多种方式进行脱氯,对比结果发现:原外送流程容易导致管线发生泄漏,造成次生事故;改至燃料气导致阻火器、过滤器、火嘴等部位堵塞严重,增加工作量,影响加热炉运行;增上水洗塔改至制氢装置,导致压缩机气阀结盐严重,频繁故障,影响装置正常生产。增上干气脱氯罐后,流程可根据效益优化原则多项选择,解决干气对后续设备的影响,有效避免以上出现的问题。流程优化结果表明,增上脱氯罐是脱除干气中氯的最有效方式之一。

关键词: 连续重整装置, 脱戊烷塔, 脱丁烷塔, 干气, 脱氯罐