FLUE GAS DESULFURIZATION APPARATUS AND ADSORBENT FLOW RATE-CONTROLLING APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent the SOx concentration at an outlet side from being unstable due to decrease of the concentration of an adsorbent of an adsorbing liquid at the time when the SOx concentration at an inlet side of an adsorption tower is lowered. SOLUTION: An adsorbent flow rate-controlling apparatus is provided with a subtraction apparatus 35 to carry out subtraction between the detected value 32 of SOx at an inlet by an inlet SOx detector 30 and an aiming value of SOx at an outlet and send a signal 34 of the difference, a multiplication apparatus 46 to multiply the SOx detected value 32 at the inlet by the inlet SOx detector 30 and a desulfurization set value 45 and send a signal 46 of desulfurization efficiency conversion, and a high signal selection apparatus 49 for comparing the difference signal 34 and the desulfurization efficiency conversion signal 46 and sending a selection signal 48 of the higher value, and the adsorbent flow rate controlling apparatus controls the supply amount of an adsorbent 10 based on the selection signal 48.