电解池对SO_2吸收特性及其对库仑测硫结果的影响

The adsorption characteristics of SO_2 in electrolytic cell and its influence on the results of Coulomb sulfur analyzer

以库仑测硫仪电解池对SO_2吸收特性为研究目标,探索SO_2浓度、搅拌速度、电解池溶板和电解液量对电解池吸收SO_2特性的影响。研究发现:煤样在测硫仪中燃烧SO_2释放浓度峰值在100×10^(-6)~2 000×10^(-6),硫含量越高,S02浓度越高;将SO_2标准气体和煤样燃烧产生的SO_2烟气通入电解池中,均出现饱和溢出现象;计算表明,电解池对SO_2吸收容量是恒定的,与通入的S02浓度无关。对于正常工作的电解池,中低浓度S02标准气体、中低硫煤样释放的SO_2气体均无溢出现象,而高浓度SO_2标准气体、高硫煤样均出现溢出现象,较好地解释了高硫煤测定结果偏低的机理;提高搅拌速度和增加溶板数量不能提高电解池SO_2吸收容量,而提高电解液体积、降低称样量和优化电解电路可进一步提高库仑测硫结果的准确性。

This paper made the adsorption characteristics of SO2 in electrolytic cell of Coulomb sulfur analyzer as the research target. How the SO2 concentration, stirring rate, electrolytic cell soluble plate and electrolyte weight affected the absorption characteristics of SO2 of electrolytic cell were researched. The research showed that the peak values of SO2 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 SO2 concentration increased meanwhile; when we let the SO2 standards gas and the SOz generated in coal sample combustion get through the electrolytic cell, the saturation overflow phenomenon appeared; the calculation showed that the SOz absorptive capacity of electrolytic cell was constant, it has nothing to do with the SO2 concentration. For the electrolytic cell which could normally work, the medium-low concentration SO2 standard gas , and the SO2 released by medium-low sulfur coal combustion both had no overflow phenomenon, but high concentration SO2 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 SO2 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.