Process for recovering light hydrocarbons from crude oil distillation device, as well as system

Abstract

The invention discloses a process for recovering light hydrocarbons from a crude oil distillation device, as well as a system. The process comprises the following steps: a liquid-gas jet pump is added to the crude oil distillation device, and overhead gas is introduced; rich absorbent oil at the bottom of a reabsorber of a catalytic cracking unit is used as jet liquid, and excessive pressure of the rich absorbent oil can be used for pressurizing overhead gas; the pressurized gas and the rich absorbent oil enter a main fractionating tower together through an original rich absorbent oil flowing path; in cooperation with the process, the low-pressure-drop liquid-gas jet pump is designed based on specific process conditions. By substituting the static equipment jet pump for a gas compressor, the process and the method have the advantages of low investment, no new energy consumption, simple process, high implementation property, and no influences on production or operation of the crude oil distillation device and the catalytic cracking unit, and are quite easy to popularize.

Description

technical field [0001] The invention belongs to the field of petroleum processing, and in particular relates to a process and a system for recovering light hydrocarbons in a crude oil distillation unit. Background technique [0002] The crude oil distillation unit takes advantage of the difference in relative volatility of petroleum fractions, and uses rectification to separate crude oil into gasoline, diesel, wax oil, heavy oil / residual oil and other fractions, and produces a small amount of gas. These gases are light components contained in crude oil, accounting for about 0.3-0.6% of the total crude oil (the proportion mainly depends on the nature of crude oil and the pretreatment plan of crude oil in the oil field), and the main component is C 1 ~C 4 Alkanes (also contain a small amount of C 5 and C 6 ), most of them come from the initial distillation tower and the top of the atmospheric tower of the crude oil distillation unit. Recover its higher value C 3 and C 4 ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of existing compressors in the light hydrocarbon recovery process of crude oil distillation equipment, such as large investment, high energy consumption, serious corrosion, and short service life, the primary purpose of the present invention is to provide a process for recovering light hydrocarbons in crude oil distillation equipment.

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