摘要
在固定床反应器上进行了大同烟煤以及添加钙基固硫剂的样品在不同氧气浓度、不同升温速率下的燃烧实验 .对所得到的SO2 逸出曲线采用Gaussian拟合 ,得到了各形态硫燃烧形成SO2 的温度范围以及影响形态硫逸出的反应条件 .结果表明 :随着升温速率增加 ,各形态硫燃烧释放SO2 的温度向高温区移动 .氧气浓度升高 ,各形态硫燃烧释放SO2 的温度提前 ,而且它们之间的温度间隔缩小 .加入的钙基添加剂中 ,CaO和Ca(OH) 2具有较高的固硫能力 ,而CaCO3 由于与SO2 反应困难 ,在低温阶段没有固硫效果 ;相反 ,由于它的催化作用 ,在低温阶段甚至促进了SO2 的释放 .机械搅拌法和超声搅拌法加入的Ca(OH) 2 由于高分散性 ,表现出比机械混合更好的固硫效果 ,其中超声的作用尤其明显 .实验证明 ,固硫中间体CaSO3 在进一步燃烧形成CaSO4的过程中会释放出一定量的SO2 .
Combustion experiments of Datong coal and its Ca-added samples were performed in a fixed-bed reactor at different heating rates and different O2 concentrations. From the peak-fitting of SO2 curve according to Gaussian function, the SO2 formation temperatures of all kinds of sulfur forms were obtained. It was concluded that: (1) the combustion temperature of different sulfur forms was influenced by O2 concentration and heating rate. They could evolve as SO2 at lower temperature with increasing O2 concentration or decreasing heating rate. (2) The added CaO and Ca(OH)2 had better sulfur retention effect for the high reactivity. However CaCO3 could increase SO2 emission at a low temperature for its bad reactivity and its catalyzing effect on SO2 formation. (3) The impregnation with stirring and ultrasonic treatment had much better sulfur retention effect than mechanical mixing for the high dispersion. (4) While oxidizing CaSO3 to CaSO4, a small amount of SO2 was evolved.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第6期813-818,共6页
CIESC Journal
基金
国家重点基础研究发展规划项目 (No G19990 2 2 10 2 )
国际科技合作重点项目 (No 2 0 0 2DFG0 0 0 0 11)~~
关键词
煤燃烧
形态硫
SO2
钙基添加剂
固硫
Calcium compounds
Desulfurization
Environmental protection
Fuel additives
Sulfur dioxide