| 摘要 |
<p>PURPOSE:To provide a device for controlling the circulating flow rate of a liquid absorbent for a wet flue gas desulfurizer where the circulating flow rate of the liquid absorbent is controlled to keep the desulfurization efficiency at the desired value without measuring the sulfite concentration in the liquid absorbent. CONSTITUTION:A exhaust gas flow rate 2, a liquid absorbent pH value 3, an inlet SO2 concentration 4 and a desulfurization rate 6 are inputted into an on-line measured value related estimator 36 consisting of a hierarchical neural net to calculate the liquid absorbent circulating flow rate, and a weight coefficient 27 of neurone bond in the estimator 36 is determined so that deviation between the liquid absorbent circulating flow rate and the actual circulating flow rate may not be more than the prescribed value. Next, an exhaust gas flow rate 7 after elapsing of time of dt, a liquid absorbent pH at 8 and an inlet SO2 concentration 9 and the neurone bond weight coefficient 27 in the estimator 36 are inputted into a flow rate demand preceded value calculator 37 having a neural net of the same constitution as the estimator 36 to obtain a liquid absorbent circulating flow rate preceded value 12, a signal 12 being corrected by a deviation signal 14 of a desulfurization rate 13 obtained from the inlet SO2 concentration 9 and an outlet SO2 concentration 10 and a desulfurization rate set value 11 to determine the number of liquid absorbent pumps in operation.</p> |
