METHOD AND APPARATUS FOR REMOVING EXTRANEOUS MATTER FROM A COOLING WATER SYSTEM

摘要

: The invention relates to method and apparatus for removing extraneous matter from a cooling water system having a tubular heat exchanger such as a condensor. When a pressure difference between upstream and downstream sides of a filter element exceeds a predetermined threshold value set in advance in accordance with the flow rate of the cooling water, a blow-down operation is started to remove the extraneous matter from the outer peripheral surface of the filter element by a circulating flow. The extraneous matter can be removed at a degree of clogging of the filter element of 50%, irrespective of the flow rate of the cooling water. The amount of clogging can be sensed accurately and related to the flow rate of the water so that the blow-down operation is effected with the necessary and sufficient frequency; not too often to waste water or too seldom to permit excessive clogging.