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为了探讨高硫煤还原磷石膏生成SO2的反应机理,通过热重分析等手段,对连续升温条件下不同C/SO3比和不同高硫煤粒径对SO2浓度的影响进行了研究。实验结果表明:用高硫煤还原磷石膏可以大大提高SO2浓度,在700~800℃和1 000~1 100℃时SO2浓度出现了2个峰值,与磷石膏煅烧产生的SO2浓度比较,最大分别提高了25.55%和42%;<800℃时较强的还原气氛有利于SO2的生成,反之;在700~800℃时高硫煤粒径对SO2浓度的影响最显著,SO2浓度最大相差约15%;SO2浓度随着粒径的减小呈先减小后增大的趋势。
In order to investigate the reaction mechanism of SO2 production from phosphogypsum from high-sulfur coal, the effects of different C / SO3 ratios and different high-sulfur coal particle sizes on SO2 concentration under continuous heating were studied by means of thermogravimetric analysis. The experimental results show that the SO2 concentration can be greatly increased by reducing phosphogypsum with high-sulfur coal, and two peaks appear at 700-800 ° C and 1000-1 100 ° C. Compared with the SO2 concentration produced by calcination of phosphogypsum, Which is 25.55% and 42% respectively. The strong reducing atmosphere at 800 ℃ is favorable for the formation of SO2. On the contrary, the effect of the particle size of high sulfur coal on the SO2 concentration is the most significant at 700-800 ℃, and the maximum SO2 concentration is about 15 %; SO2 concentration decreases first and then increases with the decrease of particle size.