The adsorption characteristics of SO2 in electrolytic cell and its influence on the results of Coulomb sulfur analyzer

SHI Pei-pei; ZHANG Hong; YAO Qiang; JIA Li-guo; ZHANG Xu-ding; SHAO Xuan

doi:10.3969/j.issn.1007-7677.2015.06.004

Abstract：This paper made the adsorption characteristics of SO 2 in electrolytic cell of Coulomb sulfur analyzer as the research target.How the SO 2 concentration, stirring rate, electrolytic cell soluble plate and electrolyte weight affected the absorption characteristics of SO 2 of electrolytic cell were researched.The research showed that the peak values of SO 2 released during coal sample combustion in sulfur analyzer were in the range of 100×10 -6 ~2 000×10 -6 , when the sulfur content was higher, the SO 2 concentration increased meanwhile; when we let the SO 2 standards gas and the SO 2 generated in coal sample combustion get through the electrolytic cell, the saturation overflow phenomenon appeared; the calculation showed that the SO 2 absorptive capacity of electrolytic cell was constant, it has nothing to do with the SO 2 concentration.For the electrolytic cell which could normally work, the medium-low concentration SO 2 standard gas , and the SO 2 released by medium-low sulfur coal combustion both had no overflow phenomenon, but high concentration SO 2 standard gas and high sulfur coal sample both had the overflow phenomenon, therefore, the mechanisms of why the determination result of high sulfur coal was high could be explained;increasing the stirring rate and soluble plate quantity could not increase the SO 2 absorptive capacity of electrolytic cell, but raising the electrolyte volume, reducing the sample amount and optimizing of electrolytic circuit could improve the accuracy of result of sulfur analyzer further.