| 摘要(英) |
With the continuous increase of carbon dioxide (CO2), methane (CH4), and other greenhouse gases in the atmosphere due to human activities, it is considered to be the main cause of global warming and climate change. Therefore, how to capture the greenhouse gases from emission is the current technology concerns of industries. There are many ways to capture carbon dioxide in Carbon Capture, Utilization and Storage (CCUS) technology. One of the methods is the pressure swing adsorption process (PSA), according to the properties of different adsorbents, and with different operation steps to achieve the purpose of gas separation. The advantages of PSA are simple operation, low energy consumption, and low operating cost.
In this study, a two-stage vacuum pressure swing adsorption (VPSA) process was used. The adsorption bed was filled with COSMO 13X molecular sieve. The discharge pre-treated flue gas of a coal-fired power plant was sent to the VPSA to capture CO2. At this time, carbon dioxide in the flue gas accounted for about 10% to 12.5%. The research aimed to achieve the goal of carbon dioxide purity of 80% and recovery reaching 70%. In order to achieve the goal of carbon dioxide purity and recovery, we chose three factors that have imported impacts on the purity and recovery of carbon dioxide, which are step 1/4 time, step 3/6 time, and cocurrent depressurization pressure of the first-stage dual-bed PSA. After that the CO2 product of the first-stage PSA filled the storage tanks, the second-stage single-bed three-step VPSA process was used to increase the carbon dioxide concentration. The influence of each factor on carbon dioxide purity, carbon dioxide recovery, and energy consumption was discussed with design of experiments (DOE), and the regression models of carbon dioxide purity, carbon dioxide recovery, and energy consumption of the first stage were established respectively. Finally, optimal results were analyzed. At the optimal conditions, carbon dioxide purity and recovery from regression could reach the research goal. |
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