Determining the interactive effects in CO₂ capture integrated with coal flotation by high-order multifield synergy model

CO₂ capture is very essential to mitigate the greenhouse gas control. However, the CO₂ desorption is quite costly during CO₂ capture. To reduce the cost, the CO₂ desorption integrated with coal flotation was developed as a retrofitted process, which can simultaneously achieve the CO₂ desorption and coal flotation. To determine the key interactive effects between coal, amine, and CO₂ in the process, a high-order multifield synergy model was developed accordingly. According to the high-order multifield synergy model, the effects of coal particle diameter, coal weight fraction, CO₂ loading, and amine on the CO₂ desorption and coal flotation were analyzed in detail. It was found that there is almost twice the CO₂ amount at coal weight fraction of 0.06 than that at a coal weight fraction of 0.02. The coal recovery rate at 0.35 mol/mol is twice of that at 0.15 mol/mol. The adsorption energy, adsorption layer thickness, and zeta potential determine the interactive effects between coal, amine, and CO₂. The coal, amine, and CO₂ system increases the coal recovery rate by 25% and reduces the CO₂ desorption energy by 20% with desorption temperature below 373 K. The high-order multifield synergy model shows the advantages of higher prediction accuracy and is easier to converge than the conventional multifield synergy model.