Experience of Using the Nalco 1392 Scale Inhibitor in the Circulating Water Supply System of the Novovoronezh NPP
Power industry enterprises use a large amount of water for cooling steam in steam turbine condensers or lubricating oils, gas and air of turbine units. The main requirement for the quality of the cooling water is to ensure a normal vacuum in the condensers. The cooling water must not form mineral and biological deposits in the system as well as corrosion products. Deposits of mineral salts in the condenser tube system, as well as in auxiliary cooling systems, lead to deterioration in heat transfer, significantly decreasing the efficiency of the operating power equipment and requiring periodical flushings of the heat exchange equipment. The raw water used for cooling is commonly taken from nearby bodies of water (large rivers or lakes). Circulating water supply systems are the most common: in these systems, the same water inventory is repeatedly used for cooling, and requires only small amounts of make-up for evaporation losses. Coolers, in this case, are cooling towers, spray pools and evaporation ponds. The water chemistry should ensure the operation of the equipment without damage to its components and loss of efficiency caused by corrosion of the internal surfaces as well as without the formation of scale and sludge. Using the circulating water supply scheme, it becomes possible to most effectively carry out a stabilization treatment program that provides an economical and environmentally friendly mode of operation. In order to inhibit scaling on the heat exchange surfaces of the turbine condenser tubes at Novovoronezh-5, the cooling water was treated with the Nalko 1392 inhibitor. The authors present the results of pilot tests of the Nalko 1392 inhibitor in the circulating water supply system (with a cooling pond).
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