Abstract
Post-combustion CO2 capture (PCC) is considered to be an important technology for reducing carbon dioxide emissions owing to its easy retrofit to power plants. Chemical absorption, adsorption and membrane separation are typical mainstreams in PCC. In technological cluster of CO2 adsorption, temperature swing adsorption (TSA) is one of efficient methods. In recent years, the topic on energy consumption and energy efficiency of TSA is emerging as an urgent response to the possible large-scale deployment of CCS. However, most studies apply mathematical model and simulation method for performance assessment for TSA, without enough specific supports from experiment researches. To conduct an experiment-guided analysis on the energy-efficiency of TSA, a 4-step TSA apparatus was designed and developed. The separation and energy-efficiency performance are the main performance indicators in the analysis. Zeolite 13X-APG was employed in experiment and its selectivity of CO2 over N2 was obtained according to isotherms of two components measured experimentally. Four groups of experiment results were obtained for affect analysis from CO2 concentration, desorption duration, adsorption temperature and desorption temperature to the purity, recovery rate, specific energy consumption and second-law efficiency. The results show that the range of second-law efficiency is between 3.24% and 9.23% with the maximum recovery rate of 83.97% and purity of 94.70%. Increase of desorption temperature and CO2 concentration, decrease of adsorption temperature lead to an improvement of the separation and energy-efficiency performance. There exists a reasonable desorption time demonstrates the sufficient desorption. After the time, the improvement of the separation performance is little and the energy efficiency decreases with an excess heat input. The findings may be useful to optimize the operation strategy for TSA system.
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