| 摘要 |
The invention relates to the petroleum-processing industry, in particular, to a retarded coking process directed to the production of gas oil fractions (light gas oil and two types of heavy gas oil). The method comprises heating a starting stock, feeding same into an evaporator for mixing with recycled material and forming a secondary stock, coking the secondary stock and fractionating the resulting coking products in a rectification column, thereby producing gas, petrol; light and heavy coking gas oils, and bottoms. Heavy coking gas oil is used as the recycled material. The method envisages feeding cooled heavy gas oil to mass-exchange devices in the lower part of the rectification column, and feeding a metered quantity of cooled light gas oil to mass-exchange devices in the upper part of the rectification column. The quantity of cooled light and heavy gas oils which can be fed in changes depending on the required quantity and quality of the light and heavy gas oils and bottoms being produced. |
