CONTROLLING METHOD FOR WATER QUALITY OF CIRCULATING COOLING WATER OF COOLING TOWER

摘要

PURPOSE: To simplify control of circulating cooling water of a cooling tower by a method wherein the amount of blow-down by a blow-down device is measured and water treatment agent is dosed into the circulating cooling water corresponding to the measured results. ;CONSTITUTION: Blow-down of cooling water through a syphon pipe 6 is started, and when the blow-down amount reaches a predetermined figure, an operation controller 10 issues a blow-down completion signal to open a release valve 9 of an air supply pipe 8. Therefore, air is supplied into the syphon pipe 6 to stop the syphon phenomena, thus the blow-down operation finishes. During the blow-down operation, a timer 13 counts the actual operation time period and the measured blow-down operation time period is sent to the operation controller 10. The operation controller 10 issues a water treatment agent dosing signal corresponding to the measured blow-down operation time period to bring a water treatment agent dosing device 12 into action, and water treatment agent is dosed into cooling water by an amount proportional to the measured blow-down operation time period. Thereby, the dosage amount of water treatment agent can be determined and the concentration can be always kept at a constant level.;COPYRIGHT: (C)1995,JPO