| 摘要 |
<p>PURPOSE:To loosen the lowering of dissolution velocity of limestones in a wet type blue gas desulfurization process, to keep the pH valve of absorption liquid to be high, and to obtain a high desulfurization rate by adding an organic alkali metal salt to the absorption liquid. CONSTITUTION:Flue gas 16 of coal combustion is mixed with SO2 gas sent from a cylinder 17 and then introduced to an absorption tower 11 from the lower part of a gas-liquid contact part 12 by a blower 18. The SO2 in the flue gas is absorbed by the absorption liquid, and the treated gas is taken out from the top of tower. On the other hand, the limestone slurry is supplied to the absorption tower 11 from a tank 20, and sodium acetate is also supplied to the absorption tower 11 from an additive tank 24 by a pump 25. As for the additives, organic alkali metal salts except above-mentioned one, such as magnesium acetate, sodium format are used. The additives loosen the deterioration of solubility of limestone because coexistent salts are contained in the absorption liquid and keep the pH value of the absorption liquid high.</p> |
