Method for flexibly adjusting catalytic cracking reaction-regeneration system heat balance

Abstract

The invention relates to a method for flexibly adjusting catalytic cracking reaction-regeneration system heat balance. A conventional regenerated catalyst heat remover which is arranged beside a regenerator and a regenerated catalyst cooler which is arranged on a regenerated catalyst conveying pipe are coupled and linked so that the catalyst bed temperature in the regenerator is controlled in oneaspect to solve the problem of catalyst inactivation because of overhigh temperature caused by great scorching amount in a traditional heavy oil catalytic cracking device and too much heat in the regenerator, and the carried heat and the temperature of the regenerated catalyst entering a lifting pipe reactor are adjusted in the other aspect to adjust ratios of different catalyst and oil needed for raw materials with different properties in cracking reactions. The invention takes heat and adjusts the temperatures of high-temperature regenerated catalysts in different positions in a traditionalheavy oil catalytic cracking device and flexibly adjusts the reaction-regeneration system heat balance so as to optimize heavy oil catalytic cracking process conditions and remarkably improve the yield of light oil and liquid.

Description

technical field [0001] The invention relates to a method for adjusting the heat balance of a reaction-regeneration system of a heavy oil catalytic cracking unit, belonging to the technical field of petroleum processing. Background technique [0002] In the catalytic cracking unit, a large amount of heat is released during the catalyst coke regeneration process. Due to the circulation of the catalyst between the regenerator and the reactor, the heat energy at the high temperature is carried into the riser reactor to meet the needs of the cracking reaction at the lower temperature. , so as to keep both the regeneration and cracking process at the required temperature, and realize the heat balance of the reaction-regeneration system of the heavy oil catalytic cracking unit. However, in recent years, the heavy weight of catalytic cracking raw materials has become increasingly serious, and its density, carbon residue, colloid, and asphaltene content have gradually increased. It ...

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Problems solved by technology

However, to achieve an appropriate reaction temperature under high catalyst circulation in the riser reactor and to maintain a relatively high regenerator catalyst bed temperature to ensure the regeneration effect of the catalyst, only relying on the use of a separate regenerated catalyst described in the above-mentioned patent to take It is difficult to achieve two-way regulation of thermal equipment, because increasing the catalyst circulation in the riser reactor requires a substantial increase in the heat extraction load of the regenerator heat extractor, which will inevitably interfere with the catalyst bed temperature of the regenerator

[0006] Chinese patent CN99120517 discloses a cooling method for heavy oil catalytic cracking regenerated catalyst. This method only relies on the regenerated catalyst cooler installed on the regenerated agent delivery pipeline to reduce the temperature of the regenerated catalyst to increase the catalyst circulation in the riser reactor of the catalytic cracking unit. However, this method does not consider adjusting the catalyst material level in the heat receiver to achieve flexible adjustment of the heat extraction load, so there are disadvantages of relatively fixed heat extraction load and poor adjustment flexibility.

However, relying on the temperature adjustment equipment described in the above-mentioned patents to achieve a two-way increase in heat load and agent-oil ratio is difficult to implement in engineering

For example, when it is required to increase the heat extraction load, it must be achieved by increasing the fluidization air volume to expand the catalyst bed in the temperature control equipment (increase the heat transfer area) and increase the degree of catalyst turbulence (increase the heat transfer coefficient). However, the catalyst bed After layer expansion, the average density of the catalyst bed is greatly reduced, which will reduce the driving force of the catalyst entering the riser reactor, and at the same time increase the am

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