Performance of methanol-based nanofluids with enhanced CO2 absorption under low cooling demand
The rectisol process for capturing CO2 requires low-temperature environment,a significant amount of freezing energy,and considerable energy consumption.Introducing nanoparticles into absorbents can effectively enhance the gas-liquid mass transfer rate and reduce energy consumption.This study aimed to develop methanol-based nanofluids with reduced cooling demand and improved absorption and desorption performance.The effects of factors such as the type of nanoparticles,solid loading,particle size,surfactant content,temperature,and initial CO2 concentration on CO2 capture performance were investigated,and the impact mechanisms were studied.The results indicated that the CO2 absorption and desorption enhancement effect of TiO2-methanol nanofluid with a concentration of 0.4g/L was the best among TiO2,Al2O3 and SiO2 nanofluids with concentrations ranging from 0.2-1.0g/L.After adding 0.10%polyethylene glycol octylphenyl ether(Triton X-100),the absorption and desorption enhancement effect of the nanofluid were the highest,and it still showed a noteworthy enhancement effect after 5 cycles.Furthermore,this article provided an in-depth analysis of the mechanism of enhanced absorption of nanofluids and proposed an empirical formula to predict the enhancement factor E and optimal solid loading of TiO2-methanol nanofluids.
carbon dioxide capturebubble reactormodelnanofluidslow cooling demandenhanced mass transfer
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