FIELD: oil and gas industry.
SUBSTANCE: proposed unit includes cooling and stabilization system consisting of a refrigerator-condenser and a dephlegmator, a fractionating column, a unit of thermolysis with separators of high and low pressure, evaporators of high and low pressure and an ejector, and also a furnace. During operation, oil is heated in the refrigerator-condenser and sent to fractionating column to which vapours of thermolysis are fed and from the top of which the vapours of fractioning, and from the bottom the residual fraction are brought out, which after mixing with the circulating residue of thermolysis is heated in the furnace and separated in a high-pressure separator to obtain separation vapour and residue, which is directed to the high-pressure evaporator from which the vapours of thermolysis and the residue are derived, which after mixing with the vapours of separation is fed into the low-pressure evaporator, from which the low-pressure thermolysis pairs are fed into the heat-hydrolysis vapour supply line, and the residue is sent to the low-pressure separator, from which the low-pressure separation vapours are fed to the ejector located on the line of thermolysis vapours feed, and the thermolysis residue is separated into a circulating stream and a balance stream, which is fed into the fractionation vapour outlet line. Obtained mixture is cooled in the refrigerator-condenser from which heavy fraction and vapours are removed, which are condensed and stabilized in a dephlegmator to produce a stabilisation gas and a stable condensate which is mixed with the heavy fraction to obtain a stable prepared oil.
EFFECT: simplification of unit and elimination of risk of coking of fractionator.
1 dwg
