• A TSA system designed for waste heat utilization is proposed. • PAU zeolite exhibits a high effective working capacity within a narrow temperature swing range. • The CO₂ capture cost was optimized using a superstructure-based model. • The CO₂ capture cost is within the range of 25. 26 to 51. 07 /tonne-CO₂. • When greater waste heat utilization was allowed, an operating cycle configuration with higher energy consumption was selected. CO2 capture technology is critical for mitigating greenhouse gas emissions, but high CO2 capture cost remain a significant challenge. Temperature Swing Adsorption (TSA) processes offer a cost-effective solution by utilizing waste heat for adsorbent regeneration. However, existing adsorbents have limited working capacity under waste heat conditions, making CO2 capture inefficient. To address this, a novel adsorbent—PAU zeolite—was developed. It demonstrates higher effective adsorption capacity than conventional materials within a narrow temperature swing and has been experimentally confirmed to adsorb CO2 even in the presence of water vapor at dew point temperatures down to -10°C. The CO2 capture process, including TSA process using PAU zeolite, was optimized to reduce CO2 capture cost. A Superstructure model incorporating multiple TSA operating cycle configurations was used to determine the optimal operating cycle that minimizes the net present value (NPV). A sensitivity analysis was conducted to evaluate the impact of waste heat availability on CO2 capture cost, which were optimized to range from 25. 26 to 51. 07 /tonne-CO2. The optimization also showed that waste heat primarily affected the TSA cycle time: when waste heat was available, cycle times were shorter due to negligible heating energy consumption.
Hamada et al. (Sun,) studied this question.