| 摘要 |
<p>PURPOSE:To control a blow amount of air for keeping the DO concn. of an aeration tank constant by mounting an operation means calculating the correction factor to the set value of the blow amount of air from a DO deviation value, a DO change rate and air magnification by inference and an operation means calculating the set value of the blow amount of air from an air amount indicated value, an air blow amount correction value and the correction factor. CONSTITUTION:A DO densitometer 6 is arranged to an aeration tank 2 and the indication value CPV thereof is transmitted to a control apparatus 7 along with the indication value QS of a flowmeter 1 and the indication value QA of an airflow meter 3 and the control apparatus 7 calculates the objective value QSV of the blow amount of air by operation and, on the basis of this value, the air amount of a blower 4 is controlled. The correction factor K correcting the set value of the blow amount of air is inputted to an operation means 12 calculating an air blow amount set value QAN along with the indication value QA of the airflow meter 3 and the air blow amount correction value (g) being the output of an operation means 11. The calculated air blow amount set value QAN is set to the blower 4 from the control apparatus 7 and the blow amount of air of the blower 4 is controlled on the basis of the set value QAN.</p> |
