Double-lifted pipe catalytic cracking device and method thereof

Abstract

The invention discloses a double-lifted pipe catalytic cracking device. The double-lifted pipe catalytic cracking device mainly comprises a heavy oil lifting pipe, a light hydrocarbon lifting pipe, a settlement device, regenerators and a catalyst cooler. The regenerators comprise a baffle plate regenerator and a turbulent bed regenerator, the baffle plate regenerator, the turbulent bed regenerator, and the catalyst cooler are coaxially arranged from top to down, the baffle plate regenerator is composed of an outer tube and an inner tube; a top of a circle bench-type cylindrical shell of the catalyst cooler is taken as a main wind outlet of the catalyst cooler for connecting with the bottom of a prevulcanization segment of the inner tube of the baffle plate regenerator; the bottom of the settlement device is communicated to a spent catalyst of the baffle plate regenerator, and the bottom of the catalyst cooler is respectively communicated to the bottom of the heavy oil lifting pipe and the light hydrocarbon lifting pipe through pipelines. By adopting the device disclosed by the invention, various heavy oil feed stocks and light hydrocarbon feed stocks are processed, a relatively short oiling agent contact time can be achieved, and the product quality is improved.

Description

technical field [0001] The invention relates to a double riser catalytic cracking device and method in the petrochemical industry. Background technique [0002] At present, the conventional catalytic cracking units used in the petrochemical industry generally have the following disadvantages: First, due to the limitation of regeneration kinetics, the regeneration temperature is relatively high, resulting in a relatively high temperature of the regenerated catalyst participating in the reaction (generally around 700°C) ;Limited by the heat balance of the device, the agent-oil ratio of the heavy oil riser is relatively small, generally the total agent-oil ratio is 5-8 (the total agent-oil ratio of the riser is the weight circulation of the catalyst in the riser and the feed of each strand of the riser The ratio of the sum of the weight flow rates), so that the number of active sites contacted by the unit weight of heavy oil feed is less, which inhibits the catalytic cracking r...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the existing catalytic cracking process, the measures of reducing the temperature of the regenerated catalyst and increasing the ratio of catalyst to oil in the riser of heavy oil are narrow in scope of application, the adjustment is not flexible enough, the activity of the catalyst participating in the catalytic cracking reaction of heavy oil is low, and the riser of heavy oil is difficult to realize Short oil agent contact time and other problems, the present invention provides a double riser catalytic cracking device and method

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