METHOD FOR THE RETARDED COKING OF PETROLEUM RESIDUES

摘要

The invention relates to the field of petroleum processing, in particular, to methods for producing coke by retarded coking, with a unit for trapping coke steaming and cooling products. The method comprises premixing stock with recycling heavy coking gas oil in an evaporation column in order to form a secondary stock which is subjected to retarded coking, with coke accumulating in a chamber, dividing the distillate coking products into vaporous products, light and heavy gas oils and a heavy residue, steaming the coke with steam and cooling same with water, feeding the steaming and cooling products into an absorber equipped with mass-exchange devices, dividing the steaming and cooling products in the absorber into a steam phase and a liquid phase, absorbing high-boiling petroleum products from the steam phase by feeding a residue from the bottom of the absorber to a mass-exchange device, cooling and condensing the components of the steam phase in a condenser refrigerator and dividing the cooling products in a separator into gas, petroleum products and water. Heavy coking gas oil is used as a recycled material for mixing with the stock before coking, for rarefying the coke steaming and cooling products before same are fed into the absorber, and also said products are fed to an upper mass-exchange device of the absorber. The residue from the lower part of the absorber is returned to a mass-exchange device arranged in the middle part of the absorber, and a balanced quantity of residue from the absorber and separated petroleum products from the separator are returned to the lower part of a rectification column. The method is highly efficient and increases the output of coking products being produced.