Abstract
The technology of deferrization of industrial condensate of thermal power plants and its purification from petroleum products by granular sorption materials made on the basis of carbonate sludge is proposed. Carbonate sludge is waste from the power industry formed at the stage of preliminary purification of raw water during liming and coagulation. Granular sorption material for deferrization was obtained using the following technology: sludge with particles ranging in size from 0.01 to 0.09 mm is mixed with liquid sodium glass at a mass and volume ratio of 2 : 1. Heat treatment is carried out at a temperature of 250°C for 60 min. The technological characteristics, as well as the static and dynamic exchange capacities of the granular sorption material in relation to iron cations from model solutions, have been determined. The time and coefficient of protective action of the layer of the developed material were calculated using the Shilov equation. It is shown that the hydrogen index (pH) of the filtrate corresponds to a neutral medium, and the sorption material does not introduce secondary pollution into the production condensate and meets the standard quality indicators. It is envisaged to regenerate the spent sorbent with a dilute solution of sulfuric acid with an increasing concentration from 0.5 to 2.5%, flowing countercurrent to the production condensate. A typical scheme for cleaning return industrial condensate with loading sorption material into mechanical and ion-exchange filters for deferrization is presented. The standard equipment was selected for the production of filter material at the place of condensate purification. The cost of making material and cleaning 1 m3 condensate was calculated. The prevented environmental damage to the environment and the economic effect from the modernization of the technological scheme for the purification of returnable industrial condensate at the Kazan CHPP-1 have been determined.
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Notes
Adsorption isotherm: dependence of adsorption capacity A, mg/g on the initial concentration of ferric chloride Cin, mg/dm3.
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Nikolaeva, L.A. Estimating the Possibility of Deferrization of Return Production Condensate of a TPP with Granulated Carbonate Sludge. Therm. Eng. 69, 72–76 (2022). https://doi.org/10.1134/S0040601521120089
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DOI: https://doi.org/10.1134/S0040601521120089