Abstract
Currently, temperature swing adsorption (TSA) process is considered as a promising option for CO2 capture due to its low energy consumption and low operating cost. For a deeper understanding on energy-efficiency performance of TSA and possible integration potential with solar source, the energy-efficiency analysis on TSA cycle is conducted by using a numerical model. The developed model, which can achieve an accepted trade-off between calculation cost and quick response for the engineering application, can be simplified into two main parts: the process model for 4 steps in the cycle and Sips isothermal model for prediction on the adsorption equilibrium. The minimum separation work and the second-law efficiency are applied as evaluation indicators in the preliminary. The numerical calculation are conducted for a binary CO2/N2 feed gas using zeolite 13X as adsorbents, with a temperature range (300K-440K) between heating and cooling sources. The results show that at 310K TL, the second-law efficiency of the TSA has a range of 4.51%-17.24% with TH from 380K to 420K. Moreover, the greater the temperature difference (△T) between adsorption temperature and desorption temperature, the higher the second-law efficiency. The model system proposed in this work shows a great potential on energy-saving and the possible solar integration solution.
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