Visualized Experimental Investigation Of Cryogenic CO₂ Capture By Desublimation

Carbon capture and storage,one of effective and predominant methods to cut emissions,receives extensive concern in the background of global warming.It is a matter of great urgency to develop new carbon capture technology because of the huge costs and complex processes of traditional carbon capture technology in industrial applications.A novel carbon dioxide capture technology by cryogenic desublimation,which can be used for industrial cold recovery,has been summarized systematically.The research of the physical properties for carbon dioxide at low temperature,desublimation process for carbon dioxide,carbon capture process design by cryogenic desublimation and related design of heat exchanger are all involved.In view of the insufficiency of the existing CO2 cryogenic desublimation data,based on the phase equilibrium theory and using the PR state equation and the classical vdW mixing rule,the gas-solid phase equilibrium of CO2 in the N2/CO2 mixture system is calculated,and a more accurate CO2 desublimation temperature formula is obtained.In view of the lack of the cryogenic desublimation method for carbon capture and the less research on the heat exchanger of gas-solid separation,the flow optimization of the existing experimental platform is carried out to improve the experimental efficiency and get the temperature variation in the system of the CO2 cryogenic desublimation heat exchanger.Because the existing cryogenic carbon dioxide desublimation data is insufficient,a low temperature visualized experiment platform was setup to test and record temperature distributions and crystalline morphology in the heat exchanger for N2/CO2 binary system in different concentrations and flow rates.And different kind of carbon dioxide desublimation states are recorded.