Method and system for capturing CO2 by absorption method

Abstract

The invention relates to the field of carbon dioxide capture, and discloses a method and a system for capturing CO2 by an absorption method. The method comprises the following steps: (1) enabling an absorption liquid containing an absorbent to be in contact with CO2-containing flue gas to absorb and trap CO2 so as to obtain decarburized flue gas while enabling the absorption liquid to trap CO2 toform an absorption rich solution; (2) contacting the absorption rich solution with a carrying gas phase for desorption regeneration to obtain CO2-containing desorbed gas and a CO2-removed absorption lean solution; (3) recovering the desorbed gas, and returning the absorption lean solution to the step (1) to participate in absorption and capture, wherein the use amount of the absorbent and / or watercontained in the absorption liquid in the step (1) is determined and controlled by measuring the conductivity of the absorption rich solution and the absorption lean solution on line. According to the invention, the measurement efficiency of control parameters in the CO2 capture process through the measurement absorption method can be improved, the CO2 capture process can be better monitored fora long period, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of carbon dioxide capture, in particular to the absorption method for capturing CO 2 methods and systems. Background technique [0002] Global warming is becoming more and more serious, especially in 2018, when high temperatures above 30°C are rare in the Arctic, carbon emission reduction is imperative. CO capture by solvent method 2 It is currently the most mature CO that is most likely to be promoted on a large scale 2 Capture technology, the concentration of the absorption liquid in the solution capture technology has an effect on CO 2 The trapping effect is greatly affected, and the concentration of the absorbent is always affected by various factors in actual operation, so it is difficult to keep the concentration of the absorbing liquid constant. [0003] CN102553396A provides a method for capturing carbon dioxide in power station flue gas with high efficiency and low energy consumption, including: 1) mixing...

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Problems solved by technology

However, the CO obtained in this study 2 The capture rate is still less than 90% of the general requirement of industrial grade, and to achieve the requirement of industrial grade, the energy consumption will increase significantly, but it is not examined in depth in this literature

In addition, this article uses steam as the stripping gas, which will increase part of the steam energy consumption, and does not consider other gases in the power plant as the carrier gas to investigate the regeneration energy consumption

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