Study On Desulfurization And Denitrification Performance Of Calcium Acetate / Fly Ash

Along with the national environmental requirements gradually improve, effectively control of coal-fired flue gas pollutants and effectively use the coal fly ash has get more and more attention. In order to improve the efficiency of desulfurization and denitrification simultaneously to use the coal fly ash more effectively, this paper analyzed the physical properties, pyrolysis properties, thermodynamic calculations and the desulfurization and denitrification experiments of the compound absorbent of desulfurization and denitrification that was prepared from calcium acetate and coal fly ash. The main work and achievements of the paper are as follows:The pyrolysis experiments show that, the compound absorbent of desulfurization and denitrification of calcium acetate and coal fly ash which was obtained through hydration has the greater specific surface area than the calcium acetate and coal fly ash, and it has the best pore structure after calcination at 900℃; The pyrolysis products (SiO2, Al2O3, Fe2O3 and CaO) of the absorbent of desulfurization and denitrification after calcination at 900℃ are helpful for removing sulfur oxides and nitrogen oxides from flue gas.The thermodynamic calculation results show that in the flue gas desulfurization reaction mainly by the reaction of CaO and SO2 to achieve desulfurization effect, and most of Fe2O3 and Al2O3 are indirectly involved in the catalytic effect of SO2 removal. The denitrification is exothermic reaction and spontaneous reaction over the range of the temperature studied and the reaction can be completely. Adding coal fly ash to calcium acetate has a great role in increasing desulfurization and denitrification efficiency.Flue gas desulfurization and denitrification experiments results show that the denitrification rate increased with temperature increasing, while the desulfurization rate increased before 1000℃ and then decreased after 1000℃, and the desulfurization rate reaches the maximum at 1000℃.The desulfurization and denitrification effect is relatively good at 1100℃, and the denitrification rate is 24.5%, the desulfurization rate is 70.1%.