Experimental study on the desulfurization and evaporation characteristics of Ca(OH)2 droplets

The experiments were conducted to focus on the desulfurization and evaporation characteristics of lime slurry droplets at 298-383 K. We designed an evaporation-reaction chamber with quartz glass windows. The monodisperse slurry droplet stream was injected into the evaporation reaction chamber, and the inlet gas components (air, air + SO2) were introduced into the chamber. We applied the magnified digital in-line holography to measure the droplet parameters and calculated the evaporation rate. The effects of temperature, droplet concentration, and SO2 concentration on the evaporation rate of Ca(OH)2 droplets were discussed. Moreover, the Ca(OH)2 droplets under different experimental conditions were sampled, and the droplets were observed and analyzed using an off-line microscope. The evaporation rate of the Ca (OH)2 droplet increased at first, and then decreased during the falling process, and remained constant at last. The average evaporation rate of the Ca(OH)2 droplets increased significantly with the temperature increasing.(c) 2022 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.