FEATURES OF BEHAVIOR OF TRACERS AND SOLID СаСО3 PRECITATION IN CIRCULATION COOLING SYSTEMS
DOI:
https://doi.org/10.20535/2218-93002212018144242Keywords:
circulating water, feeding, blow, kinetic equations, rate of formation, calcium carbonate, dynamic factorAbstract
Low-temperature deposits, in particular, solid CaCO3, which is the main component of contamination of heat exchangers, as well as methods of cleaning equipment from sediments, are considered. The attention is drawn to the fact that purification only temporary renovates the purity of pipe systems of heat exchangers, and in between period deposits are accumulated with all the sequences. Therefore, more efficient are the measures that minimize the deposits during the whole period of operation of the technological equipment. The kinetic equations for soluble salts (tracers) and active concentrations of Ca2+ ions in circulating water have been formulated. It has been shown that the transitional processes for both soluble salts and for Ca2+ ions are characterized by the product of the factor φ = Gж/(Gж-Gвп) (Gж, Gвп – expense of feed water and evaporation) for the period of substitution of water in the circulating cooling system (CСS) with feed water (Тж), T = φ∙Тж. These expressions for the dependence of CaCO3 formation rate on water quality parameters, CCS operation regime, as well as the expressions for Ca2+ ions concentration established in non stabilized circulating water CCS reaches stationary (equilibrium) state. The expressions allow determining the measures to reduce the rate of CaCO3 formation and making quantitative estimation of their effectiveness. It has been shown that the quantity of CaCO3 formed in CCS is determined by calcium concentration an feed water, feeding intensity, dynamic factor and bicarbonate ions concentration. The conclusions from the paper are qualitatively agreed to the known recommendations concerning deposits minimization. However, the expressions obtained allows making qualitative estimation of measures suggested to reduce the rate of CaCO3 formation and choosing the most efficient measure or their combination and working out the best technical and economic strategy of deposits minimization.
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Copyright (c) 2020 В. З. Кочмарський, І. П. Трофимчук, В. В. Куба
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