NH3和SO3对硫酸氢铵和硫酸铵生成的影响

摘要

In order to study the influence of reactant concentration on the formation of ammonium bisulfate and ammonium sulfate, a simulating flue gas system with a more accurate composition of SO3 was established. The starting temperature of ammonium bisulfate is about 230-270℃ and the peak temperature is about 180-240℃under the experimental condition. The starting temperature and peak temperature of ammonium sulfate are about 40℃ lower than that of ammonium bisulfate. The formation of ammonium bisulfate is obviously higher than that of ammonium sulfate. With different concentration and molar ratio of NH3 and SO3 , the formation rate of ammonium bisulfate is about 64％-90％, about 6-10 times of that of ammonium sulfate with about 6％-15％ at 120℃. The increase of reactant concentration can promote the formation of both ammonium bisulfate and ammonium sulfate. And SO3 is more conducive to the formation of ammonium bisulfate than NH3 . Further analysis shows that the variation curve of the generation fraction of ammonium bisulfate and ammonium sulfate with temperature presents a single peak. As the reactant concentration increases, the temperature range at which the peak is located increases gradually.%通过建立具有更精确的SO3组分的实验室模拟烟气系统,同步研究了反应物浓度对硫酸氢铵和硫酸铵生成率和生成进度(生成速率)的影响.在实验浓度范围内,硫酸氢铵的开始生成温度为230-270℃,峰值温度为180-240℃,硫酸铵开始生成温度及峰值温度总体上比硫酸氢铵低40℃左右.硫酸氢铵的生成率明显高于硫酸铵,根据NH3和SO3浓度与物质的量比不同,烟温到120℃时,硫酸氢铵的生成率为64％-90％,硫酸铵的生成率为6％-15％,硫酸氢铵的生成率为硫酸铵的6-10倍.反应物浓度的增加会促进硫酸氢铵和硫酸铵的生成,且SO3较NH3更有利于硫酸氢铵的生成.硫酸氢铵和硫酸铵生成份额随温度的变化呈单峰状,且随着反应物浓度的增加,其峰值所在的温度区间逐渐升高.