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本文在实验室条件下通过镁渣和粉煤灰的水合反应,制备了可用于循环流化床锅炉的脱硫剂。采用热重分析法测定了脱硫剂的钙转化率,借助N2吸附法研究了不同水合条件下脱硫剂孔结构分形维数的变化特性以及分形特性对脱硫能力的影响。结果表明,镁渣孔结构的分形维数会随孔隙平均孔径的增大而减小,也会随水合温度和灰钙比的增大而增大,但在水合时间为8 h时呈现峰值特征;在最佳水合参数下,得到分形维数适中的镁渣脱硫剂,从而达到较好的脱硫效果。
In this paper, through the hydration reaction of magnesium slag and fly ash under laboratory conditions, desulfurizer can be prepared for circulating fluidized bed boiler. Thermogravimetric analysis was used to determine the calcium conversion rate of desulfurization agent. The N2 adsorption method was used to study the variation of fractal dimension of desulfurization agent pore structure under different hydration conditions and the influence of fractal characteristics on desulfurization capacity. The results show that the fractal dimension of magnesium slag pore structure decreases with the increase of pore average pore size, and also increases with the increase of hydration temperature and the ratio of ash to calcium, but the peak value appears at 8 h Under the optimum hydration parameters, the magnesium slag desulfurization agent with moderate fractal dimension is obtained, so as to achieve a better desulfurization effect.