| 摘要 |
<p>PURPOSE:To prevent the scale adhesion in a washing apparatus, by measuring the flow amount of exhaust gas, the inlet SO2-concn. of a washing apparatus, the O2-concn. in effluent gas from an oxidation apparatus, the flow amount of a washing liquid to the oxidation apparatus and the flow amount of a seed crystal slurry while manipulating the flow amount of the seed crystal slurry by the operation result of the measured values. CONSTITUTION:The gas flow amount G and the SO2-concn. ySO2 measured by the flow meter 24 and the desitometer 30 of an exhaust gas inlet duct 1 are multiplied and the obtained value is amplified K2-times by an amplifier 25. The signal of the O2-concn. in effluent gas from an oxidation apparatus 5 measured by an O2-densitometer 21 is inputted to a function generator 22. The flow amount F of a washing liquid withdrawn to the oxidation apparatus 5 from a washing apparatus 3 and the flow amount F' of a seed crystal slurry supplied to the washing apparatus 3 from the oxidation apparatus 5 are measured by flow meters 27, 32 and the measured values are inputted to a subtractor A33. Operation shown by formula is performed and the flow amount of the seed crystal slurry in an arranged pipe 6 is manipulated by a regulator 29 so that a CaSO4- concn. is constant and adjusted to a predetermined amount or more.</p> |
