延迟焦化装置运行问题分析及技术改造  

PROBLEMS AND TECHNICAL TRANSFORMATION OF DELAYED COKING UNIT

作　　者：李林[1] 刘彬[1] 孙丽琳[1] Li Lin Liu Bin Sun Lilin(PetroChina Lanzhou Petrochemical Company, Lanzhou 73006)

机构地区：[1]中国石油兰州石化公司炼油厂,兰州730060

出　　处：《石油炼制与化工》2017年第4期61-64,共4页Petroleum Processing and Petrochemicals

摘　　要：分析了中国石油兰州石化公司1.2 Mt/a延迟焦化装置运行中存在的问题,主要为冷焦污水含油、COD和悬浮物含量较高,不能直接作为冷切焦水回用;分馏塔塔顶酸性水和焦化汽柴油携带焦粉,影响下游装置的长周期运行;加热炉工艺联锁存在设计缺陷,不能有效投用。针对这些问题,通过技术改造,增上冷焦污水处理系统,处理后的冷焦水实现了回用;增上酸性水除焦粉系统及焦化混合汽柴油过滤器,减少了焦粉携带对下游装置的影响;加热炉工艺联锁由"一取一"改为"三取二",实现了联锁的有效投用。This paper analyzed the operation problems of 1.2 Mt/a delayed coking unit in PetroChina Lanzhou Petrochemical Company and introduced the results after technical transformation. The problems in existing unit included： （i）high content of oil,COD and suspended matter in coke quench sewage,which was unable to reuse as a cold coke cutting water; （ii）coke fines in the sour water from fractionator overhead,and in coking gasoline and diesel, which influence long period operation of the downstream unit; （iii）design defects in process interlock of heating furnace,leading to an invalid use. To solve these prob lems,a cold coke sewage treatment system and a coke powder removing system were added. Then the treated cold coke sewage can be reused and the influence of coke fines on the operation for downstream unit is reduced; the interlocking mode of heater furnace was changed from＂one-out-of-one＂to ＂two-out- of-three＂,and is successfully applied after transformation.

关 键 词：延迟焦化 冷焦污水 酸性水 焦粉 工艺联锁 

分 类 号：TE624.32[石油与天然气工程—油气加工工程]