Novel flow aid technology promoting mixing of raw oil and catalyst in catalytic cracking riser feeding area

Abstract

The invention is mainly used for the field of petrochemical engineering and relates to the flow aid technology which promotes mixing of raw oil and catalysts and eliminates the problem that the inner wall face of a riser feeding mixing section (1) cokes in the catalytic cracking process. The technology includes the type and the flow of a flow aid, the sizes of flow aid nozzles, distribution of the flow aid nozzles, and the installation height and angles of the flow aid nozzles. The injected flow aid can inhibit formation and development of secondary flow at a raw oil sprayer, strong backmixing of oil on the wall face is eliminated, and coking is reduced. Besides, the jet injecting angle of the raw oil can be changed, part of the raw oil is made to be quickly separated from the edge wall and diffuse to the center, quick contact and mixing of the raw oil and the catalysts are achieved, and reaction efficiency is improved. The flow aid only has the function of promoting mixing of raw oil and catalyst, does not react in a system, and the flow is proper. The flow aid nozzles (2) are installed at the proper height of the upper portion of a raw oil atomizing nozzle installation sleeve (3). Besides, the reasonable nozzle size, the distribution mode and the installation angle are adopted to guarantee that the flow aid has the enough diffusion range and collision strength.

Description

technical field [0001] The invention is mainly used in the field of petrochemical industry, and relates to a flow aid technology for promoting the mixing of raw material oil and catalyst in the riser reactor in the catalytic cracking process and eliminating coking on the wall surface of the feed section of the riser. Background technique [0002] Catalytic cracking (FCC) is an important petroleum processing technology and plays a pivotal role in the world's oil refining industry. In the catalytic cracking riser reactor, high-boiling, high-molecular heavy petroleum hydrocarbons are converted into valuable light oil target products, such as petroleum olefins, gasoline, diesel, etc., under the action of catalysts. According to different functions, the reactor can be divided into four parts from bottom to top: pre-lifting section, feed mixing section, full reaction section and outlet rapid separation section. [0003] In the feed mixing section, the atomized droplets of the raw...

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Problems solved by technology

Although these methods take into account the problems of slow oil contact and uneven matching, the problem of strong back-mixing and coking of the side wall still exists

[0008] In view of the defects existing in the prior art, the present invention has been engaged in the production design experience in this field and related fields for many years, and has developed the flow aid technology of the present invention to promote the mixing of the oil agent in the feed zone of the catalytic cracking riser, so as to improve the contact of the oil agent. Slow, unreasonable matching, strong back mixing and coking on the side wall

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