| 摘要 |
<p>PURPOSE:To save energy while stably controlling the dissolved oxygen concn. value in an aeration tank by correcting the air quantity ratio plan formed in accordance with the dissolved oxygen concn. value and the inflow rate to the aeration tank in real time, computing a target air quantity value and computing the number of the required fans in accordance with the target air quantity value. CONSTITUTION:A statistical processing 11 stores the output signal from a flow meter 9 in time series and statistically processes the time series data for one day by the categories of the day of the week, etc., to pattern the inflow rate per day in one-hour unit. An air quantity ratio plan forming section 13 forms the air quantity ratio plan for one day in one- hour unit in accordance with the above-mentioned inflow pattern. An air quantity ratio plan correcting section 15 infers the correction quantity of the air quantity ratio plan in real time from the air quantity ratio plan formed by the air quantity ratio plan forming section 13 by the inference function using an expert system in accordance with the output signals from the inflow meters 9-1 to 9-L and dissolved oxygen concn. meters 7-1 to 7-L. An intake valve control section 19 distributes the suction air quantity of the respective fans 2-1 to 2-K in accordance with the target air quantity value obtd. by an air quantity control section 17 and controls the opening degrees of intake valves 4-1 to 4-K so as to obtain the prescribed air quantity.</p> |
