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山东某炼厂1.4Mt/a催化裂解装置采用中国石化石油化工科学研究院开发的的DCC技术,装置分馏塔顶多次出现结盐现象,严重时,结盐析出,堵塞塔盘,甚至堵塞降液管;分馏塔顶及塔顶循环系统管线及设备腐蚀严重,出现泄漏现象,需经常维修更换,对装置正常生产造成较大影响。经分析认为,环境中的水或结晶水是结盐的根本原因。具体改造措施是对分馏塔顶循环油进行脱水处理,增加一台顶循分水罐,将分馏塔顶部的液态水及时分出。改造后,塔顶循环油的抽出温度降低约5℃,塔顶循环油回流量由230t/h增至290t/h,塔顶循环整体取热量与改造前相比有所增加。塔顶循环油含水量大大降低,结盐现象消失。同时,改造后汽油收率稍有降低,柴油收率略有提高,但装置总液体收率略微增加。本次改造方案投资小,对新装置的设计和现有装置的改造具有借鉴意义。
In a refinery in Shandong, a 1.4Mt / a catalytic cracking unit adopts the DCC technology developed by China Petrochemical Research Institute of Petrochemical Technology. Salt concoction occurs several times on the top of the fractionating tower. In severe cases, salt precipitation, blockage of trays and even blockage Liquid pipe; the top of the fractionation tower and tower overhead system piping and equipment corroded seriously, there is a leakage phenomenon, the need for regular maintenance replacement, the normal production of the device have a greater impact. The analysis shows that the environment of water or crystal water is the root cause of salt. The concrete reform measure is to dehydrate the circulating oil in the top of the fractionation tower and add a top circulation water separation tank to timely separate the liquid water in the top of the fractionation tower. After the reformation, the temperature of withdrawing circulating overhead oil decreased by about 5 ℃, and the refluxing flow of overhead circulating oil increased from 230t / h to 290t / h. The total amount of heat withdrawn from the top of the tower increased compared with that before the reformation. The circulating water content of the tower greatly reduces water, salt phenomenon disappears. In the meantime, after the reform, the gasoline yield decreased slightly while the diesel yield slightly increased, but the total liquid yield of the plant increased slightly. The transformation of the small investment program, the design of the new device and the transformation of existing installations have reference.