| 摘要 |
<p>PROBLEM TO BE SOLVED: To produce a desulfurization agent for a fluidized bed type boiler having light desulfurization capability at a practical and low cost by producing a limestone type desulfurization agent whose CaO grade and fine pore volume are within respectively specified ranges. SOLUTION: Limestone with high CaO grade and having high fine pore volume is efficient as a desulfurization agent for a fluidized bed type boiler. A desulfurization agent having high desulfurization capability is therefore produced at a low cost by adjusting the CaO grade within a range of 40-56 wt.% and the volume of fine pores within a range of 20-300 mm<3> /g. Further, practicality of the agent is heightened by controlling the average particle diameter as 50 wt.% transmittance diameter within a range from 100μm to 5 mm and the crushing strength within a range of 2-15 kg. In order to control the particle diameter, natural porous limestone is pulverized and sieved and, at this time, the desulfurization agent is preferably produced by mixing 4-15 wt.% of cement with 85-96 wt.% of the limestone powder having the average particle diameter as 50 wt.% transmittance diameter within a range of 1.0-500μm, adding water to the resultant powder mixture, and granulating and curing the mixture.</p> |
