Double-area double-circulation flue gas carbon dioxide absorption tower and process

Abstract

The invention relates to a double-area double-circulation flue gas carbon dioxide absorption tower which comprises an absorption tower main body, a lower absorption filler layer, an upper absorption filler layer, a lower-layer spraying device, an upper-layer spraying device, an absorption tower demister, a tower kettle I, a tower kettle II and an absorption liquid preparation box, the absorption tower main body comprises an upper-layer absorption tower and a lower-layer absorption tower; a lower absorption filler layer is arranged in the lower absorption tower, and a lower spraying device is arranged above the lower absorption filler layer; and an upper absorption filler layer is arranged in the upper-layer absorption tower, and an upper-layer spraying device is arranged above the upper absorption filler layer. The method has the beneficial effects that the height of the absorption tower can be reduced on the premise of ensuring the capture rate of lower-layer carbon dioxide by increasing the liquid-gas ratio of the lower-layer absorption tower, and the height of the absorption tower can be effectively reduced on the premise of ensuring the capture rate of upper-layer carbon dioxide by increasing the concentration of an absorbent in the upper-layer absorption tower and increasing the absorption reaction intensity; and finally, the height of the absorption tower is effectively reduced while higher capture rate of carbon dioxide in the whole tower is realized.

Description

technical field [0001] The invention relates to the fields of carbon dioxide capture, absorption tower design and environmental protection, in particular to a double-zone double-circulation flue gas carbon dioxide absorption tower and a process. Background technique [0002] In 2019, the carbon emissions of coal-fired power plants in my country's power industry accounted for about 65% of the country's total carbon emissions, making it the industry with the largest carbon emissions. Taking into account the development of my country's thermal power industry, carbon capture will be the basis for stock thermal power before 2035. The unit mainly carries out post-combustion capture technology transformation. Among the existing carbon capture technologies, the chemical absorption method is the most promising capture technology. This technology mostly uses a single-zone single-pass packed absorption tower as the absorption reactor, and uses organic amines, inorganic strong bases, etc...

AI Technical Summary

Problems solved by technology

[0003] In order to meet the flue gas carbon dioxide capture efficiency while minimizing the height of the absorption tower, the design of the absorption tower often adopts the scheme of multi-tower series connection or multiple small systems instead of large systems. These schemes not only reduce the equipment investment cost to a limited extent, but also increase Equipment footprint

At present, there is no report on the design of a carbon dioxide absorption tower that can meet the high-efficiency absorption and can effectively reduce the tower height. Therefore, it is of great significance to propose a dual-zone double-circulation flue gas carbon dioxide absorption tower and its technology.

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