煤炭燃烧固硫剂

来源期刊：中南大学学报(自然科学版)2004年第2期

论文作者：牛利民 刘清方 常虎成 张瑜

文章页码：211 - 216

关键词：固硫剂;钙硫质量比;燃煤;燃烧温度

Key words：sulfur fixing agent; mass ratio of calcium to sulfur; burning coal; combustion temperature

摘    要：对热力煤粉锅炉的燃煤含硫情况进行了分析。根据燃煤的硫形态,开发出主要化学成分为CaCO₃和MgCO₃的固硫剂。为了解释固硫机理和进一步提高固硫率,使用热失重分析仪和逸出气体红外光谱在线分析仪,研究了温度和钙硫质量比以及添加剂对固硫效果的影响。研究结果表明:燃煤的硫形态主要是硫铁矿硫;固硫剂的合适钙硫质量比范围为2∶1~3∶1,当Al₂O₃作为添加剂时,硫的去除率可达70%~80%;固硫后的生成物为CaSO₄和MgSO₄; Al₂O₃作为添加剂具有较好的助固硫效果的原因是它与固硫剂反应生成了高温下更稳定的新物相3CaO·3 Al₂O₃·CaSO₄;Cr₂O₃宜造成固体污染,不适合作为添加剂。

Abstract: The forms of sulphur in burning coal were analyzed. A sulfur fixing agent containing mainly CaCO₃ and MgCO₃was developped and the sulphur-fixingtheorywas investgigated usingthe thermal zerogravity apparatus and the gas infrared spectrumapparatus.The results showthatthe main formof sulphur in burning is sulphide iron ore. The mass ratio of sulphur to calcium plays important role on sulfur fixing. The most economic mass ratio of calcium to sulphur is 2∶1 to 3∶1; the most efficient additive is Al₂O₃, which can form CaO₃·Al₂O₃·CaSO₄ to increase the desulfurizing efficiency to 70%~80%.