高硫灰与渣中硫的测定及影响因素研究  

Determination of sulfur in fly ash and bottom ash and its influencing factors

作　　者：陈凡敏 王嘉瑞 赵冰 李小江 

机构地区：[1]华电电力科学研究院煤检中心,浙江杭州310030

出　　处：《洁净煤技术》2016年第3期30-33,39,共5页Clean Coal Technology

基　　金：国家科技部国际科技合作专项资助项目(2013DFG61490)

摘　　要：为了准确测定高硫灰及渣中硫,研究了库仑滴定法和高温管式炉燃烧红外热导法测定高硫灰及渣中硫含量的方法及其影响因素。结果表明,灰的粒径对库仑滴定法和红外热导法测定的准确性均有显著影响,需研细到0.04 mm以下时,才能消除粒径对高硫灰测定的影响。库仑滴定法测定高硫灰的时间较煤中全硫和低硫灰长200 s以上。三氧化钨的催化作用主要体现在促进灰中硫酸钙的分解。对硫含量高于现有灰标准物质的高硫含量灰,可以通过增大灰标准物质使用量的方法标定库仑测硫仪后准确测定,或通过使用煤标准物质标定库仑测硫仪后,在坩埚底部添加0.1 g活性炭法准确测定,添加活性炭能明显减少灰中硫的测定时间。In order to improve the detection accuracy of sulfur in fly ash and bottom ash,coulometric titration and infrared absorption thermal conductivity method were investigated. The results showed that the ash particle size influenced the test results obviously. When the size was less than 0. 04 mm,the effect of particle size on high-sulfur fly ash detection could be eliminated. The time of high-sulfur fly ash detection was 200 s longer than that of total-sulfur ash and low-sulfur ash. The decomposition of calcium sulfate in fly ash was promoted by tungsten trioxide. For high-sulfur ash whose ash content was higher than current ash reference material,one test method was that the Kulun sulfur detector was demarcated by increasing the usage of ash reference material first,then the sample was tested by the demarcated equipment. Another method was that,the Kulun sulfur detector was demarcated by coal reference material first,then 0. 1 g activated carbon was added at the bottom of crucible which could shorten the test time obviously.

关 键 词：高硫灰及渣 库仑滴定法 红外热导法 活性炭 

分 类 号：TQ533[化学工程—煤化学工程]