The solid content of the reaction cut feed slurry will be high
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Why is the solid content in the feed slurry for the reaction high?
The reaction feed is cut off, and both reactors become fluidized; at this point the rotational speed of the separator is not at the operating point, which may cause the catalyst to be carried into the distillation column and lead to an increase in the solid content.
When the feed to the reaction is stopped, the linear velocity at the inlet of the cyclone separator in the reactor changes, resulting in a decrease in separation efficiency; this allows catalyst to be carried into the distillation column； At the same time, due to the significant fluctuations in operations before and after cutting, coke particles on the walls of the large oil-gas line also fall off and are carried into the fractionation tower, contributing to an extremely high solid content in the slurry.
Under normal conditions, when the feed is interrupted, the amount of oil and gas decreases while the amount of steam does not increase; this inevitably leads to a reduction in the inlet linear velocity of the cyclone, resulting in poor separation efficiency and severe loss during the reaction. As a consequence, the solid content in the slurry increases, and at this point it is necessary to increase the amount of material discharged outside
With no feed available, only gas is used to blow through the catalyst. Some of the catalyst in the reactor will inevitably be blown to the bottom of the distillation column, which naturally increases the solid content of the slurry.