| 摘要 |
<p>PURPOSE:To easily and simply remove mercury contained in exhaust gas in a wet purifying method of exhaust gas by measuring the concn. of chlorine and the concn. of an oxidizing agent, etc., of washing liquid and thereby controlling the amount to be added of the oxidizing agent which is added so that mercury dissolved in washing liquid is not reduced and not volatilized as metallic mercury. CONSTITUTION:Mercury contained in exhaust gas discharged from an incinerator of wastes is contained in a state of mercuric chloride which is large in solubility for water, and in case of contact with washing liquid in a washing tower, it is completely dissolved as a form of mercuric chloride or a complex ion with chlorine in washing liquid. However, these are easily reduced by various reductive substances such as SO2 and become metallic mercury hardly soluble in water. Therefor the concn. of chlorine, the concn. of an oxidizing agent contained in washing liquid and the concn. of chlorine contained in exhaust gas are previously measured in such a case that mercury contained in washing liquid is not reduced, and the oxidizing agent is added so as to become this measured value. In such a way, while preventing corrosion of a flue-gas washing equipment due to excess oxidizing agent, mercury is dissolved in washing liquid in a stable state and can be discharged.</p> |
