关键词: DCC装置, 再生斜管, 催化剂流动, 脱气罐, 再生器床层, 平衡催化剂细粉

Abstract:

Combined with the basic theory of fluidization and the operation of the unit, the problems of unstable fluidization of the regeneration inclined pipe of the 2.2 MM TPY DCC unit of CNOOC Ningbo Daxie Petrochemical Co., Ltd., which resulted in large fluctuation of reaction temperature and large vibration of the inclined pipe, were analyzed. It was believed that the main reasons for the instability of fluidization in inclined pipe were the excessive gas carried at the inlet of the inclined pipe and the unreasonable setting of the loosening point of the inclined pipe. The catalyst exhibits bubbling bed fluidization inside the inclined pipe. By modifying the degassing tank, improving the reservoir volume of the regenerator bed, reducing the nitrogen volume of the degassing tank, optimizing the setting of the loosening point, controlling the fine powder content in the equilibrated catalyst, the degassing effect of the degassing tank was improved, the catalyst carrying gas volume in the inclined pipe was decreased, and the fluidization of the regeneration inclined pipe was significantly improved. The maximum fluctuation amplitude of the reaction temperature is reduced from ±5 ℃ to ±2 ℃, and the amplitude of the regeneration inclined pipe is reduced from 5～6 mm to 1～2 mm, providing basic guarantees for the efficient long cycle operation of the unit.

Key words: DCC unit, regeneration inclined pipe, catalyst flow, degassing tank, regenerator bed, equilibrium catalyst powder