| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the fluctuation of the pH of a liq absorbent when a neutralizer is injected into an absorption tower and the injection is stopped and to stabilize the desulfurizing performance. SOLUTION: A necessary amt. 20 of an absorbent is obtained based on the flow rate A of the gas to be desulfurized and the SO2 concn. B at the inlet of an absorption tower, the absorbent loss 36' obtained based on the injection flow rate C of a neutralizer is substracted from the necessary amt. 20 of the absorbent to obtain the correction absorbent amt. 20', an absorbent equivalent amount 24 to eliminate the deviation 22 between the set pH value and the pH of the liq absorbent is obtained, the absorbent equivalent amount 24 is added to the correction absorbent amt. 20' to obtain the necessary absorbent amt. 26 in consideration of pH, a set absorbent slurry flow rate 28 necessary to hold the pH of the liq. absorbent at the set pH value after consideration of the neutralizer injection flow rate C base on the necessary absorbent amt. 26 in consideration of pH and the concn. E of the absorbent slurry, and the absorbent slurry flow rate D is equalized with the set absorbent slurry flow rate 28.</p> |
