Techno-economic analysis of hybrid liquefaction and low-temperature adsorption carbon capture based on waste heat utilization

The techno-economic analysis of CO2 capture is important to determine its economic feasibility and its appli-cation to hybrid CO2 capture systems urgently needs more attention. This research conducts a techno-economic analysis of a hybrid CO2 system in which the waste energy and uncaptured CO2 from liquefaction are supplied to low-temperature adsorption to enhance the overall energy efficiency. Here, the process and energy models are coupled with the cost analysis model to estimate the capital cost, operational cost, and levelized cost of CO2 capture (LCOC) of the hybrid system. A series of parametric analyses are conducted to determine how the hybrid system's LCOC can be minimized. Results indicate the heat pump has the highest capital cost and is 4 times the compressor because it needs to satisfy the large cooling energy requirement. Moreover, the adsorbent mass exhibits a trade-off between a higher CO2 recovery rate and lower LCOC value due to increasing costs. Ulti-mately, based on 12.5 % CO2 partial pressure 1 kg/s flue gas, a liquefaction temperature of-48.15 degrees C, a desorption temperature of 92.5 degrees C, and operating pressure of 6 MPa, a comparable LCOC of 106.19 $ per tonne CO2 is yielded by the hybrid system.