METHOD OF REUSING BLOWING WATER FROM CIRCULATION SYSTEM FOR COOLING HEAT-EXCHANGE COPPER AND COPPER ALLOY EQUIPMENT Russian patent published in 2004 - IPC

FIELD: heat and power engineering.

SUBSTANCE: reuse of blowing water from indicated circulation system is realized within heating system. For that, blowing water, prior to be directed to heating system, is softened by diluting it with replenishing water originated from surface water object. The latter is preliminarily treated by liming in clarification tank followed by mechanical filtration of limed water on filters with grainy charge, two-step ion-exchange softening on sodium cationite filters, and adding alkyleneguanidine salt to concentration 0.12-0.19 mg/L, alkyleneguanidine salt being, more specifically, polyhexamethyleneguanidine chloride preliminarily freed of ammonia by treatment with ammonium hydroorthophosphate or first with alkali and then with acid. Above-mentioned removal of ammonia is accomplished with 40% aqueous solution of ammonium hydroorthophosphate added, at stirring, to 50% aqueous solution of polyhexamethyleneguanidine chloride at ratio of solutions 1:3, after which solution of alkyleneguanidine salt in the form of double copolymer of polyhexamethyleneguanidine chloride and hydroorthophosphate is separated from aqueous solution of ammonium salts and added to replenishing water. Alternatively, polyhexamethyleneguanidine chloride is treated with 10-50% potassium hydroxide aqueous solution and resulting product is treated with orthophosphoric acid to give triple copolymer of polyhexamethyleneguanidine chloride, base, and dihydroorthophosphate. Consumption of blowing water is maintained at the level required by heating system as reuse water. Method enables increasing concentration of compounds dissolved in treated water up do concentration depending of structural features of cooling towers and state of underground communication lines without risk of overgrowing thereof with chemical and biological-nature deposits. Such concentrations of dissolved compounds in circulation water do not go beyond maximum permissible concentrations for drinking water.

EFFECT: achieved purity of blowing water appropriate for use at objects of open and closed industrial water supply systems.

3 cl, 2 tbl, 9 ex