| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve desulfurization efficiency and to obtain high concentration sulfuric acid by a method in which a sulfur dioxide absorption part is converted into multiple stages to be combined in a series, absorbing liquid and exhaust gas are brought into contact with each other in a crossflow, the concentration of diluted sulfuric acid of the absorbing liquid is decreased from a stage to another in order of gas flow. SOLUTION: Absorption liquid is pumped up from each liquid receiver B-1, B-2, B-3 in the lower part of each absorption unit 1, 2, 3 to the upper part of each absorption unit 1, 2, 3 by pumps P-1, P-2, P-3 and flows down to the liquid receivers B-1, B-2, B-3 in the lower part respectively. Besides, exhaust gas containing sulfur dioxide is introduced from the exhaust gas inlet G-1 of the absorption unit 1 into an absorption apparatus and is brought into contact with the absorbing liquid in sequence in a crossflow in the absorption units 1, 2, 3, and the sulfur dioxide is absorbed by the absorbing liquid and discharged from a gas outlet. The absorbing liquid supplied to the absorption unit 3 is water, the absorbing liquid supplied to the absorption unit 2 is the absorbing liquid of the liquid receiver B-3, and the absorbing liquid supplied to the foremost absorption unit 1 is the absorbing liquid of the liquid receiver B-2.</p> |
