D214 STUDY ON THE INFLUENCING FACTORS OF FLUE GAS DESULFURIZATION BY MAGNESIA(Environmental Protection-3)

Using laboratory-scale bubbling reactor, the relationship between desulfurization efficiency and several factors were studied, including flow rate of the simulated flue gas, concentration of magnesia absorbent and magnesium sulfate, concentration of sulfur dioxide in the flue gas, and temperature of the absorption liquid etc. With the parameters close to the practical conditions, the results indicated that the whole desulfurization process can be divided into two parts according to the pH value of absorption liquid. The efficiency improves with the increase of concentration of magnesia or magnesium sulfate, and decreases with the increase of flue gas flow rate or concentration of sulfur dioxide. The temperature has no obvious effect on the desulfurization efficiency. It can be concluded that magnesium desulfurization process is controlled by the mass transfer of sulfur dioxide at the gas-liquid interface, especially the chemical absorbent reaction in liquid film.