METHOD OF CALCULATING THE HYBRID CIRCUITS CONDITIONING PURGE WATER CIRCULATING COOLING SYSTEMS
DOI:
https://doi.org/10.20535/2218-93001522014137586Keywords:
circulating cooling system, pre-treatment, extra water, circulating waterAbstract
It is shown that the water chemistry mode of recirculating cooling system without scale ensures high costs of additional water and blowdown (about 300 m3/h per 1000MW of installed capacity).
To reduce the discharge of blowdown water to the environment a method and calculation algorithm for a number of schemes with blowdown water recirculation through clarifiers are proposed. Method of calculation the water chemistry mode of recirculating cooling system is to determine calcium hardness and predict deposit thickness for the estimated operation time of the plant. The proposed method allows to calculate not only calcium hardness, but the pH, concentration of other ions, including sulphates.
We have shown that by using structural schemes of complex recirculating cooling system with recirculation blowdown water through a clarifier the concentration of sulfates that can reach critical values in terms of intensification of power equipment corrosion.
To correct critical sulphates concentration an appropriate methodology of water exchange is suggested. The proposed methodology and calculation algorithm enable the justification of blowdown water sampling points selection and flow of side-stream supplied to the recirculation and water exchange, depending on the water-chemical conditions and the quality of the source water. Calculations are presented for two water chemistry modes.
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Copyright (c) 2020 В. А. Кишневский, В. В. Чиченин, И. Д. Шуляк, Е. В. Кишневский
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