Method and device for catalytic cracking of heavy oil

Abstract

The invention provides a method and a device for catalytic cracking of heavy oil and belongs to the field of catalysis of heavy oil. The method is characterized by comprising the following steps that: in a reactor comprising a pre-elevating segment, a first reaction area and a second reaction area, a cooled regenerated catalyst is used and flows upward under an action of a pre-elevating medium toenter the first reaction area; the catalyst is contacted with the catalytic materials for reaction at the lower part of the first reaction area; the formed oil mixture enters the second reaction area, and continues to be fully contacted for reaction in the second reaction area, and a rapid cooling agent is used for controlling the reaction temperature in the second reaction area; the oil mixture coming out of the second reaction area enters a settler from an outlet necking segment for gas-solid separation, the carbon-carrying catalyst after reaction enters a steam stripping segment of the settler for steam stripping, and the carbon-carrying catalyst after steam stripping enters a regenerator for regeneration; and the regenerated catalyst, which regains activity, enters an external heat-remover along a regenerated inclined tube, the cooled regenerating agent enters an elevating tube for circular use, and the reaction oil gas, from which the carbon-carrying catalyst is separated, is sent to a system for separating following products. The device has the advantages of solving the problem of upgrading oil quality, improving the residue blending proportion and light oil yield, and simultaneously lowering the yield of dry gas and coke.

Description

technical field [0001] The invention belongs to the field of heavy oil catalysis, in particular to a catalytic cracking method and device using heavy oil as a raw material. Background technique [0002] With the rapid development of the national economy in recent years, the number of domestic automobiles has maintained a relatively high growth trend. The extensive use of automobiles brings comfort and convenience to people's lives, but also causes serious pollution to the atmosphere. From January 1, 2010, the gasoline standard for motor vehicles must meet the National III emission standard, requiring the olefin content of gasoline to be less than 30φ%, and the aromatic content to be less than 42φ%. In my country, FCC gasoline accounts for more than 80m% of finished gasoline, and the olefin content in FCC gasoline is 40-65φ%, which makes the olefin content in finished gasoline significantly higher than the new specification index of gasoline. Therefore, reducing the olefin ...

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Problems solved by technology

[0007] The invention provides a novel method and device for catalytic cracking of heavy oil, which solves the problems of excessively high scorching temperature of the regenerator and removal of excess heat from the regenerator by adding a regenerated inclined tube heat collector; by optimizing the reaction conditions, the reduction of gasoline Olefins, increasing isoparaffins, reducing dry gas and coke yields, increasing slag ratio and light oil yield.

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