RFCC装置在线切除和投用外取热器的成功尝试  

Successful attempt to disconnect external catalyst cooler from on-line RFCC unit and connect it in operation

作　　者：刘春贵[1] 王文清[1] 伊岚 

机构地区：[1]中国石油大庆石化分公司,黑龙江省大庆市163711 [2]大庆榆树林油田开发有限责任公司,黑龙江省大庆市151100

出　　处：《炼油技术与工程》2013年第12期16-18,共3页Petroleum Refinery Engineering

摘　　要：介绍了中国石油大庆石化分公司1.0 Mt/a重油催化裂化装置开工20 a来首次在线切除和投用外取热器的过程。针对该装置强制循环水泵出口阀内漏致使机泵的机械密封无法检修的问题,通过制定在线切除外取热器的方案,将外取热器及热工系统切除,从而实现了换阀过程,避免了装置非计划停工,保证了装置长周期运行。在外取热器切除的过程中,为了防止外取热器管束干烧爆管而影响其使用寿命,在外取热器切除后,通过强制循环水泵循环冷却将外取热器的温度降低到200℃以下;投用时上水与外取热器的温差也只有几十度,而且升温流化的过程比较缓慢,确保了外取热器的使用寿命。近1 a的运行实践证明,该方案是安全可靠的。PetroChina Daqing Petrochemical Co. , Ltd has successfully disconnected the external catalyst cooler from a 1.0 MM TPY RFCC unit and connected it for the first time in 20 years＇ operation after it came on stream. As the leaking of discharge valve of cooling water pump made it impossible to maintain the mechan- ical seal of the pump, it was planned to disconnect the catalyst cooler and associated thermal system to replace the valve without unscheduled shutting down of the RFCC unit and to realize the long-term operation. In order to prevent overheating of catalyst cooler tubes and tube rupture and minimize the impact on the tube service life, pumped cooling water was used to reduce the catalyst cooler temperature to lower than 200℃ after dis- connection of catalyst cooler. When catalyst cooler was connected, the temperature difference between feed water and catalyst cooler was only dozens of degrees centigrade. The temperature rise and fluidization process were slow, and service life of catalyst were ensured. The one year＇ s operation shows that this plan is reliable and safe.

关 键 词：重油催化裂化装置 外取热器 切除 投用 长周期 

分 类 号：TE965[石油与天然气工程—石油机械设备]