摘要
探讨了添加剂对石灰石固硫促进作用的机理 :添加剂改变了 Ca O的孔结构、孔分布和表面性质 ;添加剂在一定程度上催化了 Ca O与 SO2 的表面化学反应 ;由于添加剂所加离子的掺杂 ,引起固硫产物层晶格的缺陷 ,大大提高了产物层扩散系数 ;添加剂的加入 ,改变了钙基固硫剂中钙的化学形式 ,生成新的含钙化合物 ,它们与 SO2 反应活性更高 ,或形成了高温下更稳定的多元化合物 ;添加剂及其燃烧的条件可以改变固硫最终产物 .
The mechanics of the promotion of additives were discussed in this work: additives can change the surface properties and pore characteristics of CaO; additives have catalytic effect on the surface chemical reaction of CaO with SO 2; Ions of additives cause the lattice defects in the crystal of sulfation product layer, that dramatically promote the product layer diffusivity; Some new compounds of calcium can be produced when additives are added to limestone or CaO, these new compounds are more active than CaO to react with SO 2; The oxidation of CaS and the decomposition of CaSO 4 can be reduced by vitreous matter produced from additives, especially at high temperature.
出处
《煤炭转化》
CAS
CSCD
2000年第3期72-76,共5页
Coal Conversion
基金
国家重点基础研究发展规划项目!( G19990 2 2 2 0 5 1)
清华大学基础研究基金!( JC19990 5 2 )
关键词
固硫
助剂
氧化钙
固硫剂
煤燃烧
CaO (limestone), sulfur retention, additive
