METHOD OF UTILISING BLOWDOWN WATER OF CIRCULATING SYSTEM Russian patent published in 2013 - IPC C02F9/12 C02F1/42 C02F1/44 C02F1/32 C02F1/50 C02F103/02 

FIELD: chemistry.

SUBSTANCE: invention can be applied at thermal power plants. Method includes clarification filtration and deep demineralisation of blowdown water flow before utilisation, supply of additional water into circulating system and its preliminary demineralisation by reagent decarbonisation and sodium-cation exchange in alkaline medium, water demineralisation by sodium-cation exchange in the mode of primary and secondary cation exchange, prevention of continuous emission into atmospheric air of phenol from composition of circulating water in the process of its evaporation cooling and bactericidal processing of additional water flow by polyhexamethylene guanidine derivative. Blowdown water after clarification filtration is subjected to short-wave ultraviolet irradiation and is separated into two flows. One flow is processed with lime to pH=9.0-10.5, is demineralised by sodium-cation exchange in the mode of secondary cation exchange and directed to heating system feed. The other flow if successively subjected to deep demineralisation by sodium-cation exchange in the mode of secondary cation exchange, to primary and secondary reverse-osmosis filtering.

EFFECT: method ensures exclusion of uncontrolled emission of phenol into atmosphere in the process of evaporation cooling of blowdown water and growth of its corrosion activity, reduction of consumption of reagents for ensuring safety of blowdown water in circulatory cooling system of thermoelectric power plant and obtaining highly demineralised water.

2 cl, 17 ex, 1 tbl