关键词: 连续重整装置, 低负荷, 待生剂提升, 二次气控制阀开度, 分离料斗压力

Abstract: According to the lifting operation changes of the spent catalyst and interruption during back blowing in a CCR unit under low-load operation, after in-depth analysis of the reasons, it was found that when the pressure of the reaction system reduced, the separation hopper had no corresponding pressure-reducing mode. As a result, the opening of secondary gas control valve increased, and the “reverse pressure differential” of the spent catalyst flow increased from 15 kPa to 25 kPa, so that the flow of the spent catalyst in the riser was not smooth, and even interrupted after the back blowing. The problem could be solved by controlling the pressure of separation hopper and the opening of secondary gas control valve. Considering the feasibility and the difficulty of practical measures, using the manual pressure relief valve to reduce the separation hopper pressure, the “reverse pressure differential” of the spent catalyst flow was maintained at 15 kPa, opening the manual valve in time when back blowing to relieve pressure, which effectively solved the problem.

Key words: CCR unit, low-load, lift of spent catalyst, opening of secondary gas control valve, separation hopper pressure