| 摘要 |
<p>PURPOSE:To stably and certainly hold the concn. of SOx in exhaust gas after desulfurization to a prescribed value or less by estimating the amt. of SOx in exhaust gas from the component and supply amt. of fuel and controlling the discharge flow rate of a circulating soln. and the supply amt. of an SOx absorbent from the estimated value. CONSTITUTION:The signals of a fuel A flowmeter 12, a fuel B flowmeter 13 and an air flowmeter 14 are inputted to a desulfurization control unit 20 and the amt. of SOx in exhaust gas is estimated from those signals and, from this estimated value and a prescribed value, the amt. of SOx to be removed in an absorbing tower 2 is calculated. The amt. of a reaction product is calculated from the amt. of an SOx absorbent reacting with this SOx amt. to determine the discharge flow rate of a circulating soln. 3. This discharge flow rate is inputted to a discharge soln. control unit 18 and a discharge soln. flowmeter 10 is controlled by a valve 9. Next, the required SOx absorbent concn. of the circulating soln. 3 is determined from the necessary amt. of the SOx absorbent and inputted to be compared with the detection value of a pH meter 16 and the flow rate of an absorbent flowmeter 7 is controlled by a valve 6 and the SOx absorbent is supplied to the circulating soln. 3.</p> |
