Study On Preparation Of Hydration Sorbent Of Fly Ash/Ca(OH)2 And The Effect Of The Desulfurization

More recently, dry and semi-dry gas desulfurization techniques using finely divided lime slurry as for SO2 have drawn increasing interest. These dry and semi-dry FGD techniques are projected to have lower capital and operating costs than the conventional wet FGD techniques. Further more, the waste product is dry powder rather than wet sludge. This offers potential advantages in the areas of waste handling and disposal. Through reading large numbers literature this article find that the higher operating costs incurred due to poor sorbent utilization may make them uneconomical for application to application. With these factors in mind, current technologies of dry and semi-dry flue gas desulfurization are reviewed while focus on increasing the utilization of the calsium-based sorbents. Thus they will have the competition on the economy. In this article, the first, fly ash was slurried with Ca(OH)2 at elevated temperature to produce reactive calcium sorbents for flue gas desulfurization and mensurate the surface area of the sorbent. The surface area of the sorbent is about as four times as high the arithmeticals addition of surface areas of initial solids before hydration. The relative surface area in relation to the hydration condition (time, water/solids ratio, fly ash/ Ca(OH)2 ratio) and the source of fly ash. The hydration time effect is the most important. And the hydration time has an optimal value. The second, the sorbent was used in the simulated flue gas desulfurization to verify the utilization of Ca(OH)2 and the velocity of the reaction. The result revealed that the surface area increment of the hydrated sorbents have great effect on the desulfurization. The greater the surface area, the higher the speed of the desulfurization as well as the utilization of Ca(OH)2.