(73j) 3-Reactor Chemical Looping System for Point Source CO2 Capture and Subsequent Utilization for Liquid Fuel Production

Owing to the rising emissions and climate change, CO₂ capture and utilization from point sources is the need of the hour. Technologies that can, therefore, capture the CO₂ and then utilize it to form chemical products can lead to higher applicability. A novel 3-reactor chemical looping system is proposed with calcium ferrite (Ca₂Fe₂O₅) oxygen carrier material for the capture and utilization of point source CO₂ and its subsequent utilization in liquid fuel production. In the first reactor, a flue gas stream is inlet counter-currently on the oxygen carriers, wherein the Ca₂Fe₂O₅ oxygen carriers get carbonated to form CaCO₃+Fe₂O₃. The carbonated oxygen carriers are then transported to a second reactor, wherein they react with biomass to form high-purity syngas, which can then be integrated into the Fischer-Tropsch process for liquid fuel generation. The reduced oxygen carriers are then transported to a third reactor wherein the reduced oxygen carriers are reacted with air to regenerate the oxygen carriers back to Ca₂Fe₂O₅. Process simulation studies have been conducted to design the process and optimize the parameters. It is observed that the carbonation occurs better at a lower temperature, and the gasification reaction occurs with higher efficiency at a higher temperature. Therefore, heat integration strategies have been discussed to optimize process efficiency and achieve autothermicity. Further thermogravimetric experiments have been conducted to test the feasibility of the process.