| 摘要 |
<p>A wet type exhaust gas desulfurization method wherein an exhaust gas discharged from a combustion apparatus, such as a boiler and an absorption liquid are brought into contact with each other to have sulfur oxide in the exhaust gas absorbed in the absorption liquid and neutralize the sulfur oxide-absorbed absorption liquid, characterized in that lime stones of a large grain size are allowed to stay selectively in a position in which the absorption liquid is neutralized, the absorption liquid which contains as main components gypsum produced from the sulfur oxide and water being discharged selectively from the neutralization position. In the neutralization position, an ascending current of the absorption liquid is formed, or an ascending current of air or water is formed with or separately from the ascending current of the absorption liquid, to produce a fluidized bed of lime stone particles, whereby the reactivity of the lime stone is maintained with the scaling of gypsum particles around the lime stones prevented. Thus, even when aluminum and fluorocomponents coexist in the absorption liquid, the desulfurization performance does not substantially lower. Moreover, the cost of power for pulverizing the lime stones can be reduced, and high desulfurizing performance can be attained.</p> |
