A fixed fluidized bed reactor and its application

Abstract

The invention discloses a fixed fluidized bed reactor and an application thereof. The reactor comprises a top sealing structure and a reactor main body; an outlet pipe (8) and a material feeding pipe (1) are communicated with the reactor; the reactor main body comprises, from up to down, a settling section (I), a first reaction section (II-1), a second reaction section (II-2), and an oil agent initial contact section (III); the cross-sectional area of the lower end of the settling section (I) is equal to the cross-sectional area of the upper end of the first reaction section (II-1); the cross-sectional area of the lower end of the first reaction section (II-1) is equal to the cross-sectional area of the upper end of the second reaction section (II-2); the cross-sectional area of the lower end of the second reaction section (II-2) is equal to the cross-sectional area of the upper end of the oil agent initial contact section (III); the cross-sectional area of the first reaction section (II-1) increases gradually from up to down; and the cross-sectional area of the second reaction section (II-2) decreases gradually from up to down. When used in catalytic cracking of light oil such as naphtha and the like, the fixed fluidized bed reactor provided by the invention has the advantages of stable bed layer linear speed, complete oil agent contact, and the like, and is beneficial to product distribution improvement.

Description

technical field [0001] The invention relates to a fixed fluidized bed reactor and its application. Background technique [0002] Catalytic cracking is a technology that cracks petroleum hydrocarbons in the presence of catalysts to produce low-carbon olefins. Due to the advantages of wide source of raw materials, easy adjustment of olefin product structure, low energy consumption and less carbon dioxide emissions, catalytic cracking technology has made great progress in recent years. a faster development. Especially for light oil products such as naphtha catalytic cracking technology is an important technology to optimize the utilization of naphtha resources and improve the economic benefits of refineries. The process development around this technology, the development of catalysts, or the screening of different feedstock oils and catalysts The evaluation is inseparable from the small evaluation device in the laboratory. [0003] At present, the experimental devices used in...

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Problems solved by technology

[0008] In summary, the fixed fluidized bed reactors in the prior art are mainly aimed at the conventional catalytic cracking and catalytic cracking of heavy oils, because the catalytic cracking reactions of light oils such as naphtha have high reaction temperature and low catalyst-to-oil ratio. Large, high oil and gas linear velocity, prolific gas production, etc., but when the above-mentioned fixed fluidized bed reactor is used for catalytic cracking, the catalyst distribution in the bed is not uniform under high temperature reaction conditions, and the oil agent is not in sufficient contact, which will affect The final product distribution, so the fixed fluidized bed reactor of the prior art is not suitable for the catalytic cracking reaction temperature of light oil products such as naphtha, high reaction temperature, large agent-oil ratio, high oil-gas linear velocity, prolific gas production, etc. special response needs

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