Catalytic cracking regeneration method with zero emission of carbon dioxide

Abstract

The invention discloses a catalytic cracking regeneration method with zero emission of carbon dioxide. The method comprises the following steps that air is compressed and separated, obtained oxygen is used for catalyst regeneration, then the catalyst in obtained regenerated flue gas is separated, and flue gas pressure energy and heat energy are recycled; the regenerated flue gas heats a desorption tower kettle material to become low-temperature flue gas; the low-temperature flue gas is desulfurized, water vapor is separated and removed to obtain dry flue gas, one part of the dry flue gas is sent to a flue gas circulating compressor and pressurized for circulation, and carbon dioxide in the other part of the dry flue gas is absorbed and enriched to obtain lean gas and rich liquid; the rich liquid enters a desorption tower to be desorbed, and an alcohol amine solution and carbon dioxide are recovered; one part of the alcohol amine solution exchanges heat with flue gas discharged from a waste heat boiler and then returns to the desorption tower, the other part of the alcohol amine solution exchanges heat through a feeding heater of the desorption tower and then is mixed with a fresh alcohol amine solution, and the mixed solution enters an absorption tower; and the recovered carbon dioxide is used for sealing or oil displacement treatment. The catalytic cracking regeneration method can effectively reduce carbon emission from the source.

Description

technical field [0001] The invention relates to a catalytic cracking regeneration method with zero emission of carbon dioxide, belonging to the technical field of petroleum processing. Background technique [0002] Currently, CO in refineries 2 The main emission sources are: fuel combustion emissions (heating furnaces, self-provided power plants, torches, etc.) account for more than half, process emissions (catalytic coking, hydrogen conversion, etc.) account for about 40%, indirect emissions (pumps, compressors, etc.) mechanical and electrical equipment, etc.). The carbon emissions in the heavy oil processing process are mainly the flue gas emissions of catalytic cracking coking, hydrogen production process, boilers and other equipment, and the energy consumption of the process. Among them, the catalytic cracking unit is the core equipment in the refinery. The carbon emission caused by the burning of the catalytic cracking regenerator accounts for 24-55% of the carbon emi...

AI Technical Summary

Problems solved by technology

[0006] The conventional catalytic cracking regeneration process is to pass air or oxygen-containing gas into the fluidized bed for regeneration, and the air is formed by O 2 and N 2 Composition, so the regeneration flue gas contains a lot of N 2 , and the concentration of carbon dioxide is low, if it is directly emitted, it will cause the greenhouse effect, and carbon capture requires high energy consumption

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