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采用双提升管的催化裂化(FCC)装置再生滑阀出现故障后,欲实现不停工处理,关键有二:一是建立新的催化剂循环系统,二是以装置压力平衡和热平衡为重点进行操作调整,满足正常运转需要。确保压力平衡的关键,是沉降器快分在最低线速以上运行,沉降器藏量能够自动调节,气压机入口压力不低于机组自保启动值。为此,需要降低原料油流量到设计负荷的50%～60%,提高预提升干(富)气流量至其上限值,即6000m3/h(标准),降低气压机转速,提高其返喘振流量;其后,根据热量平衡,提高汽油提升管反应温度至600℃,选择合适的汽油回炼量,并适当降低再生器主风供给量。当压力平衡得到满足后,使用燃烧油,确保供热链的正常,停用外取热设施,提高装置掺渣比,适当降低再生催化剂温度。2010年2月5日,长岭石化1号FCC装置再生滑阀盘根箱发生催化剂严重泄漏,采取关闭再生滑阀的方法进行堵漏。利用汽油提升管反应后的待生催化剂,通过待生循环滑阀改进重油提升管,建立新的催化剂循环,历时7h,成功做到不停工处理再生滑阀问题。
There are two key things to do when the regenerative slide valve of FCC riser with dual riser fails. One is to set up a new catalyst circulation system and the other is to adjust the operation based on the pressure balance and thermal balance of the unit , To meet the needs of normal operation. The key to ensure pressure balance is quick settling points run at minimum line speed, settler reserves can be automatically adjusted, the inlet pressure of the compressor is not lower than the self-protection start value of the unit. To this end, the need to reduce the flow of feedstock to the design load of 50% to 60%, increase the pre-lift dry (rich) gas flow to its upper limit, that is, 6000m3 / h (standard), reduce air compressor speed, Then, according to the balance of heat, raise the reaction temperature of the gasoline riser to 600 ℃, select the appropriate amount of gasoline to be refined, and properly reduce the main air supply to the regenerator. When the pressure balance is satisfied, the use of combustion oil, to ensure the normal supply chain, to disable the heat extraction facilities, improve the device slag ratio, the appropriate reduction of regenerated catalyst temperature. February 5, 2010, Changling Petrochemical No. 1 FCC unit regeneration spool valve box serious leakage of catalyst, take the method of closing the regeneration valve plugging. Using the spent catalyst after the gasoline riser reaction, the heavy oil riser was improved through the standby circulation slide valve to establish a new catalyst cycle, which successfully solved the problem of regenerative slide valve without stopping working for 7h.