SOLID CaCO3 FORMATION IN WATERS OF CIRCULATING COOLING SYSTEMS OF POWER PLANTS UNDER THE CONDITIONS OF ELECTRIC LOAD CHANGE

Authors

  • V. Z. Kochmarskii National University of Water and Environmental Engineering, Physical and technological laboratory of water systems, Rivne, Ukraine
  • V. O. Melnyk National University of Water and Environmental Engineering, Physical and technological laboratory of water systems, Rivne, Ukraine

DOI:

https://doi.org/10.20535/2218-93002322018144957

Keywords:

circulating water, stability index, solid calcium carbonate, formation rate, electric load, evaporation flow

Abstract

The rate of solid calcium carbonate (Dve) formation in circulating water (CW) of circulating cooling systems (CCS) of power plants with cooler towers and the stability index of such water at changing electric load is analyzed. The relationship between streams of CCS, namely, feeding, evaporation and blow, which exist under the condition of constant CCS water volume and dependence of evaporation flow upon units load are the basis of analysis. Such dependence is based on the fact that the main channel of heat dissipation after steam turbine units is evaporation in cooling towers. The general expression has been obtained in quasiequilibrium approximation that establishes the relation between Dve and CW stability index. This dependence allows calculating CW stability degree for any models of CaCO3 formation kinetics and to obtain corresponding Dve value. It has been shown that the rate of solid CaCO3 formation is directly proportional to electrical load of power plant, Ca2+ ion concentration in feed water and fraction of used heat dissipated by evaporation, antiproportional to stability index, inverse  to CCS water volume and the average efficiency of power plant.

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Published

2018-11-01

Issue

Vol. 23 No. 2 (2018)

Section

Статті

License

Copyright (c) 2020 V. Z. Kochmarskii, V. O. Melnyk

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