A method and system for preparing light olefins from crude oil

Abstract

The invention relates to a method and system for preparing low-carbon olefins from crude oil. The method is carried out as follows: the crude oil is sent to the first tube group in the convection section of the cracking furnace for preheating, and then vaporized to form the first vapor phase and the second steam phase. One liquid phase; the first liquid phase is sent to the first tube group of the convection section of the cracking furnace to be preheated and then distilled to form an overhead fraction, a middle fraction and a bottom fraction; the overhead fraction, the middle fraction and the first After the steam phase is mixed, it is sent to the second tube group of the convection section of the cracking furnace, and after being heated to the crossing temperature, it is sent to the radiation section for cracking to obtain cracked gas; the bottom fraction is subjected to deep catalytic cracking to obtain deep catalytic cracking gas, which is then combined with the The cracked gas is separated to obtain light olefins. The invention adopts cracking furnace to cooperate with vaporization treatment unit, distillation unit and deep catalytic cracking unit, which can effectively solve the problems that heavy cracking raw materials cannot be fully gasified in the convection section and are easy to coke in the radiation section and the quenching section.

Description

Technical field [0001] The present invention relates to the field of preparation of low-carbon olefins, in particular to a crude oil preparation of low-carbon olefins method and system. Background [0002] Low-carbon olefins usually refer to the general term for unsaturated hydrocarbons with carbon four and below carbon four, mainly including ethylene, propylene, isobutylene, butadiene and other organic chemical raw materials with high economic value. With the development of China's economy, the demand for these organic chemical raw materials has increased year by year, although the production scale of low-carbon olefins is also increasing year by year, but it is still unable to meet the growing demand. [0003] For a long time, China has been using naphtha to prepare low-carbon olefin products. However, in recent years, with the associated gas in the Middle East oil fields and the large-scale exploitation of shale gas in the United States, these cheap oil and gas resources have ...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method and system for preparing low-carbon olefins from crude oil in order to overcome the problems of insufficient crude oil vaporization, easy coking in the cracking process, and low yield of low-carbon olefins in the prior art. It can improve the cracking efficiency of crude oil raw materials, prolong the operation period, reduce the coking phenomenon during cracking, and increase the yield of low-carbon olefins in the product at the same time

Images