| 摘要 |
<p>PURPOSE:To prevent inhibition of dissolution of CaCO3 and decrease of absorption performance in the disposition of waste gas contg. SO2, HCl, and HF by adding an alkaline compd. intermittently to an absorption liquid contg. CaCO3 and performing further blowing of air and/or addition of an MN compd. to the absorption liquid. CONSTITUTION:Waste gas 1 is fed to a waste gas disposing tower to absorb SO2, HCl, and HF in the waste gas in an absorption liquid comprising CaCO3 slurry, and purified gas 6 is discharged. Na2CO3 corresponding to the quantity of HCl, and HF absorbed by the absorption liquid is fed from a line 8 pulsatively. At the same time, air is blown from an air nozzle 10. Furthermore, MnSO4 is fed from the line 8. Thus, the pH of the absorption liquid is increased and the desulfurization performance is improved. Inhibitive phenomenon for dissolution of CaCO3 due to Cl<-> ion, F<-> ion, and Al ion is also eliminated.</p> |
