Study on fine particles influence on sodium sulfite and oxygen gas-liquid reaction

Abstract

Wet limestone scrubbing is the most common flue gas desulfurization process for control of sulfur dioxide emissions from the combustion of fossil fuels, and forced oxidation is a key part of the reaction. During the reaction which controlled by gas-liquid mass transfer, the fine particles' characteristic, size, solid loading and temperature has a great influence on gas-liquid mass transfer. In the present work is to explain how these factors influence the reaction between Na2SO3 and O2 and find the best react conditions through experiment. The oxidation rate was experimentally studied by contacting pure oxygen with a sodium sulfite solution with active carbon particle in a stirred tank, and the system pressure drop was record by the pressure sensor. At the beginning the pressure is about 215kPa and Na 2SO3 is about 0.5mol/L. The temperature is 40°C,50°C,60°C,70°C 80°C. Compare the results of no particles included, we can conclude that high temperature, proper loadings and smaller particles resulting in higher mass transfer coefficients kL. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2012.