Carbon Dioxide Capture Plant Recovery Agent

he absorbent of the chemical absorption method is easily consumed and needs to be constantly replenished. At the same time, the absorbent will corrode the equipment. In addition, due to the high water content in the absorbent, the regeneration energy consumption during operation is high. At present, there have been many studies on the development of two-phase absorbents at home and abroad, which is expected to improve the problems of absorbent corrosion, volatilization and high energy consumption. Compared with the chemical absorption method, the adsorption method uses zeolite and other adsorbents to capture CO2. The adsorption/regeneration process is simple to operate, has the advantages of no degradation and no corrosion, and no harmful secondary products are generated. It shows advantages and potential in large-scale CO2 capture applications. Adsorption processes such as DR-VPSA, AD Asorb, and Two-stage VPSA have been pilot-tested or are in the experimental verification stage.

The adsorption method uses the difference in the adsorption capacity of the adsorbent for CO2 at different temperatures/pressures to achieve CO2 separation and recovery, including two stages of adsorption and desorption. According to the different desorption methods, it can be divided into pressure swing adsorption, temperature swing adsorption, and temperature swing pressure swing coupled adsorption process. However, the current adsorption method also has the problems of high energy consumption when treating low-concentration CO2 flue gas, and low CO2 product gas concentration and recovery rate. Therefore, the adsorption method may be more suitable for the treatment of raw gas with higher concentrations. There are many related case studies on the adsorption technology for capturing CO2 in flue gas at home and abroad, most of which are in the laboratory development or pilot stage, and there are few large-scale commercial applications.