폐기물소각로와 배연탈황공정에 이용하기 위한 흡수제 수화반응 측정 I

I. Absorbent Hydration Reaction Measurements for FGD and Waste Incinerator Process

The objective of this study is to investigate the hydration reaction and characteristics of Danyang · Backwang limestone/waste shell/shinyo lime. The properties of the waste shell which cause pollution problems were investigated in Southern beach. A limestone/waste shell is selected as an alkali reagent in waste incinerator/flue gas desurfurization processes. The results from above study are as follows. 1. To understand the properties of absorbents, ICP, XRD, EDAX analyses are performed. It is found limestone and waste shell are composed of calcium mostly and some of Na, Mg, Fe, Mn, Si and a few of Cu, Ni and Cd. The main component of waste shell, is calcium of about 38∼39% and lime is about 53∼54% and it becomes 96∼97% in CaCO_3 basis. The limestones from Danyang, Backwang have 53∼55% lime, respectively. 2. During the hydration, the pore structures and surface areas of particles are changed, considerous the expeimental results obtained from the absorbent particles before and after hydration. In the hydration experimental results of lime, 90℃(24 hr) of hydration temperature showed a specific suface area of 11.979㎥/g. The surface areas of limestone sample hydrated with different water temperature as a hydration were 2.3135 ㎥/g, 7.51 ㎥/g, 7.63 ㎥/g, 7.55 ㎥/g, 7.25 ㎥/g, 7.41 ㎥/g, 11.9 ㎥/g, 11.979 ㎥/g. Thus the value at 80∼90℃ hydrated sample is found to be the highest. After hydration, the specific surface area of limestone sample increase but actually does not increase with temperature. This suggest that slurring rate and time might affect hydration condition and the optimum hydration temperature is 80∼90℃. 3. The BET surface area of waste shell and limestone samples was hydrated in 90℃ isothermal condition. So, this increase of specific surface area through hydration can not be predicted in CaCO_3 state. 4. As the hydration temperature increases, the calcinated limestone/seashell/clam sample shows a higher reactivity, but the reactivity of hard shelled mussel sample is lower than that of limestone.