Under what criteria is the catalytic slurry discharged from the unit?
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I’ve never worked on catalytic units, but I’m aware of the general process. Apart from being sent back for reprocessing or returned to the tower, is there a portion of the catalytic slurry that exits the unit directly? Or which specific indicator needs to exceed a certain value before the slurry is sent out of the unit?
When the solid content of the slurry exceeds the specified limit (generally kept at no more than 6.9 g/l), it is necessary to reduce the solid content at the bottom of the distillation tower; however, when it is no longer possible to increase the amount of slurry fed back for reprocessing, it must be sent outside.
It turns out that during the catalytic processing of wax oil, due to the good properties of the raw material, the oil slurry is discharged intermittently. As catalytic processing of heavy oil becomes more widespread, the properties of the raw material change to be worse, with an increase in components that are difficult to crack; as a result, the yield of oil slurry increases, and it starts to be discharged continuously
The density of the slurry shall not exceed 1030 kg/m3
A high solid content definitely requires removal of the excess material; furthermore, when the liquid level at the bottom of the fractionation tower is high and the amount of oil to be reprocessed cannot be balanced, it is necessary to remove the excess slurry.
The density of the slurry is relatively high, generally not exceeding 1.1； The solid content of the slurry should be controlled at no more than 6 g/L