CIRCULATING WATER REUSE APPARATUS AND REUSE METHOD IN COOLING SYSTEM FOR OPEN CIRCULATING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a method in a circulating water cooling system of an open circulating system in which salt crystallization and development of organisms are prevented, a stable circulating water quality is maintained, sticking of polluting matters including oil is prevented, the development of microorganism is restrained and which is cheap and easy for maintenance control.;SOLUTION: Part of the circulating water of an open circulating system in the steel industry is branched at a bypass tube, filtered and separated at a reverse osmosis membrane. The filtered water is reused as a water for steel process which carries out cooling of a roll or a hydraulic apparatus at the steel facilities, and carries out dilution of a rolling oil or a chemical. Part of the enriched drain is flowed into an electrolyte tank which is separated by a diaphragm having an ion permeability. An acid electrolytic water generated at the anode side of the electrolyte tank and an alkali electrolyte water generated at the cathode side are mixed into the circulating water alternately, and injected into a cooling tower intermittently. By doing this, sticking of polluting matters including oil to the cooling tower cell or the circulation piping is prevented and the development of microorganisms is restrained.;COPYRIGHT: (C)2009,JPO&INPIT