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长庆石化120×104t/a加氢裂化装置本周期运行已接近3a,逐步进入操作末期。在操作运行上,催化剂活性明显下降,且存在装置加工负荷低(约为设计负荷的73%)、转化率不高(维持在55%左右)、反应温度接近设计温度等问题,对装置长周期运行带来影响。通过稳定原料性质,控制原料馏程的90%点馏出温度不大于480℃,以降低原料干点值,降低裂化反应苛刻度。同时,密切监控原料的硫、氮含量,及时调整反应温度,可以减缓催化剂的失活速率,延长装置运行周期。控制高氢分压尽可能接近设计值(10.6MPa),氢油比维持在(900～1000)∶1,控制精制油氮含量在10ug/g以下,对保证装置安全平稳操作有利。装置运行末期,应将保证平稳运行放在首位,适当调整生产方案,如多产尾油(8%～12%),可优化原料性质;必要时采取补充硫化措施,亦有利于装置的平稳操作。
Changqing Petrochemical 120 × 104t / a hydrocracking unit this cycle has run close to 3a, and gradually into the operation of the end. In the operation of the catalyst, the catalyst activity decreased significantly, and there is a low processing load device (about 73% of the design load), the conversion rate is not high (maintained at about 55%), the reaction temperature close to the design temperature and other issues on the device long period Impact of operation. By stabilizing the properties of the raw materials, the 90% distillation point of the raw material distillation range is controlled not to exceed 480 ° C. to reduce the dry point of the raw materials and reduce the severity of the cracking reaction. At the same time, close monitoring of raw materials, sulfur, nitrogen content, timely adjustment of the reaction temperature, catalyst deactivation rate can be slowed, to extend the device operating cycle. Control of high hydrogen partial pressure as close to the design value as possible (10.6MPa), hydrogen-oil ratio maintained at (900 ~ 1000): 1, the control of refined oil nitrogen content of 10ug / g or less, to ensure the safe and stable operation of the device is beneficial. The end of the operation of the plant should be to ensure smooth operation of the first place, the appropriate adjustment of production programs, such as prolific tailings (8% ~ 12%), to optimize the nature of raw materials; if necessary, take additional vulcanization measures, but also conducive to the smooth operation of the device .