Olefin catalytic cracking reaction system and method

Abstract

The invention discloses an olefin catalytic cracking reaction system and method. The system includes an expansion machine unit; the expansion machine unit includes an expansion machine; a pre-hydrogenation reactor outlet pipeline is divided into two branches, one branch is connected with a pre-hydrogenation circulation pump and then is connected with a pre-hydrogenation cooler, and the other branch is connected with a pre-hydrogenation feeding and discharging heat exchanger and then is connected with a catalytic cracking feeding vaporization tank; the top of the catalytic cracking feeding vaporization tank is connected with the expansion machine, and an outlet of the expansion machine is successively connected with the catalytic cracking reaction feeding and discharging heat exchanger and a feeding heater and then is connected with a catalytic cracking reactor. The method comprises that a pre-hydrogenation reaction discharging material is directly heated and evaporated without reduction of a pressure, and after evaporation, the pressure is reduced to a catalytic cracking reaction required pressure via the expansion machine. The method of firstly heating evaporation of the pre-hydrogenation reaction discharging material and then taking the evaporated material as an expansion machine working medium for driving a machine pump is used for replacing a conventional flow method of firstly reducing the pressure and then evaporating, the pressure potential of the pre-hydrogenation reaction discharging material is used for applying work, and thus the purposes of reducing energy consumption and saving operating cost are achieved.

Description

technical field [0001] The invention relates to the technical field of producing propylene and ethylene by catalytic cracking of heavy olefins with carbon four or more, and furthermore, relates to an olefin catalytic cracking reaction system and method. Background technique [0002] Olefin catalytic cracking technology is a kind of light molecular olefin propylene and ethylene obtained by catalytic cracking of olefins contained in the raw material by using the by-product C4 and heavier components of ethylene unit, MTO unit or refinery unit as raw material, under the action of catalyst. method. to avoid raw 注1 The dienes, alkynes, etc. entrained in the catalytic cracking reactor will deposit carbon in the catalytic cracking reactor, causing catalyst deactivation, shortening the reaction cycle, increasing side reactions, and decreasing reaction selectivity. Usually, a pre-hydrogenation reactor for reaction feed can be installed to remove Hazardous components such as dienes a...

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Problems solved by technology

[0006] This typical process is less energy-saving and has higher operating costs. The reason is that the operating pressure of the pre-hydrogenation reaction is relatively high, while the operating pressure of the olefin catalytic cracking reaction is relatively low. This process uses a pressure reducing valve to reduce pressure, and the pressure of the material is not fully utilized. potential energy

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