Experimental And Model Study Of Gas-liquid Mass Transfer Enhancement By Nanoparticles

The emission of carbon dioxide is increasing day by day,and it is the main gas that contributes to the greenhouse effect.The reduction of carbon dioxide emissions cannot be ignored and is a top priority.As of today,significant results have been achieved in the research of carbon dioxide capture and storage technology.Among them,the most widely used carbon dioxide capture method is the organic amine absorption method.However,this technology still has an insurmountable bottleneck,that is,the gas-liquid mass transfer rate.Relevant studies have found that adding a certain amount of nanoparticles to the absorption solution can improve the gas-liquid mass transfer efficiency,but the experimental and model research on its enhancement mechanism has not yet been perfected.Therefore,the absorption experiments of various gases and solutions have been carried out in depth to establish a more complete Enhanced mass transfer model.This paper introduces the composition of the total internal reflection fluorescence microscope(TIRF)experimental platform and the principle of evanescent wave,the image processing program and experimental error for processing experimental images based on MATLAB algorithm.The experimental study of nanofluid absorption of carbon dioxide in a self-designed sample cell has been carried out,and the effect of nanoparticle type,solid content and mass concentration of the absorption solution on the absorption of carbon dioxide has been obtained,and the principle of mass transfer enhancement is summarized from the mechanism.The enhancement law of the particles used in this experiment is as follows:Fe3O4>ZnO>CuO,the maximum values are 3.61,2.62,1.83,respectively;the best solid content is 0.6g/L,at this time the enhancement factor is the largest,and the deviation of the solid content from this maximum will bring The enhancement factor is reduced;the enhancement factor is the largest when the MEA solution mass concentration is 40%,but the determination of the optimal mass concentration is not only considered from the change of the mass transfer enhancement factor.This paper uses MEA nanofluid to absorb carbon dioxide experiment,deeply study the mass transfer mechanism,establish a suitable mass transfer model,comprehensively consider the influence of chemical reaction,combine the boundary layer bonding mechanism and transfer mechanism,simplify the experimental conditions and make assumptions,and establish the transfer mechanism.Quality control equations,analogous grid-Boltzmann method to determine the distribution of nanoparticles,using numerical methods to solve,the model’s calculated enhancement factor and actual enhancement factor are compared,the error is less than 7%.The mass transfer model established in this paper provides reference and guidance for the in-depth study of nanofluid intensified gas-liquid mass transfer.