Carbon dioxide (CO2) capturing system applicable for phase change absorbent

Abstract

The invention provides a carbon dioxide (CO2) capturing system applicable for a phase change absorbent. The system comprises an absorption tower, a phase splitter, a dense phase pump, at least one stage of an interstage separator, at least one stage of an interstage cooler, a mixer, a rich solution pump, and a desorption tower, wherein the absorption tower comprises a tower cavity; the part of thetower cavity between a first inlet of the absorption tower and a second inlet of the absorption tower is divided into a plurality of stages, and a barren solution containing the phase change absorbent is stored in each stage of the tower cavity; the phase change absorbent contains nanoparticles; and each stage of the interstage separator communicates with a corresponding stage outlet of the absorption tower. The CO2 capturing system applicable for the phase change absorbent has the advantages that the nanoparticles achieve the function of enhancing gas-liquid mass transfer, that is, the nanoparticles can improve the heat transfer rate of the phase change absorbent in CO2 in captured exhaust gas, and accelerate the reaction between the phase change absorbent in the CO2 in the captured exhaust gas and the CO2, so that the CO2 absorption capacity and the CO2 capturing rate can be improved; and moreover, the solution treatment amount during desorption is reduced, so that the energy consumption is lowered.

Description

technical field [0001] The invention relates to the field of carbon dioxide capture, in particular to a carbon dioxide capture system suitable for phase-change absorbents. Background technique [0002] At present, the greenhouse effect and global warming are hot issues in the world, CO 2 It is the man-made greenhouse gas that contributes the most to the greenhouse effect. Currently CO 2 The capture separation method mainly adopts chemical absorption method. The principle of chemical absorption method is: at low temperature, solvent and CO 2 A chemical reaction occurs to absorb it, and when heated, the saturated absorbent undergoes a reverse reaction to convert CO 2 desorb out. The role of desorption is to recover the solute (CO 2 ), while regenerating the absorbent (recovering the ability to absorb solutes). [0003] Since the 1930s, it has been applied to CO 2 The chemical absorbent of capture technology has experienced three generations of development, from the fir...

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Problems solved by technology

High cost due to high energy consumption (cost of steam required) is CO 2 Capture the main barriers to technology adoption and key issues that need to be addressed

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