烧结半干法脱硫灰资源化利用研究与实践

Research and practice on resource utilization of sintering semi-dry desulfurization ash

烧结半干法脱硫副产物脱硫灰因其成分复杂,组分含量波动大,一直未能得到充分利用。本文提出将脱硫灰替代部分熔剂返回烧结,新生成的含硫烟气导入活性炭脱硫塔后制取硫酸的新方法,并开展了工业试验。结果表明:在烧结过程中,脱硫灰主要发生分解还原反应,脱硫灰带入的硫97%进入烧结烟气中。脱硫灰的加入对烧结矿成分和质量以及成品率影响不大,固体燃料消耗略微升高,但当加入量大于0.15%后,烧结机利用系数下降明显;活性炭脱硫脱硝系统因设计富余能力较大,对系统脱硫效率影响不大,但后续制酸系统余量不足,当脱硫灰加入量超过0.15%后,实际硫酸产量下降25%;脱硫灰进入烧结处理完全可行,但加入量不宜超过原料配比的0.15%。

The sintering semi-dry desulfurization by-product,desulfurization ash,has not been fully utilized due to its complex composition and large fluctuation of component content.A new method for preparing sulfuric acid after the newly generated sulfur-containing flue gas is introduced into the activated carbon desulfurization tower instead of part of the fusing agent is proposed,and industrial tests are carried out.The results show that during the sintering process,desulfurization ash mainly undergoes decomposition and reduction reaction,and 97%sulfur brought by desulfurization ash enters the sintering flue gas.Adding desulfurization ash has litle effect on the composition,quality and yield of sinters,and the consumption of solid fuel increases slightly,but when the addition is greater than 0.15%and the utilization factor of the sinter machine drops significantly.Due to the large design surplus capacity of activated carbon desulfurization and denitrification system,the desulfurization efficiency of the system has lttle impact,but the residual amount of subsequent acid production system is insufficient,and when the amount of desulfurization ash added exceeds 0.15%,the actual sulfuric acid production decreases by 25%.It is completely feasible for desulfurization ash to enter the sintering treatment,but the amount of addition should not exceed 0.15%of the raw material ratio.