Вісники та науково-технічні збірники, журнали
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Item Drying of cenospheres recovered by the wet-based method from coal fly ash for their rational use(Видавництво Львівської політехніки, 2023-02-28) Kindzera, Diana; Atamanyuk, Volodymyr; Hosovskyi, Roman; Mitin, Ihor; Lviv Polytechnic National UniversitySince slag and coal fly ash (CFA) are major global pollutants produced by thermal power plants (TPPs), special attention should be paid to their rational disposal. Scanning electron microscopy (SEM) was used to study the morphology of CFA and it was suggested that the use potential of CFA is high due to the presence of a large number of cenospheres (CSs), that can be recovered mostly by wet methods for the production of the wide range of products with improved properties. However, such decisions regarding the application of the cenospheres are largely related to the problem of their drying after removal. The article is devoted to the investigation of the filtration method as less energy-consuming for the drying of cenospheres. The effect of the drying agent velocity on the mass transfer intensity has been established. The values of mass transfer coefficients have been calculated based on the thin-layer experimental data and equation . Calculated mass transfer coefficients for cenospheres have been correlated by the dimensionless expression , based on which equation has been proposed to calculate the mass transfer coefficients, which is important at the filtration drying equipment design stage.Item Application of slag from thermal power plant for the production of porous filler(Видавництво Львівської політехніки, 2021-06-01) Mitin, Ihor; Kindzera, Diana; Atamanyuk, Volodymyr; Lviv Polytechnic National UniversityThe article is devoted to obtaining a porous filler from the slag of the Thermal Power Plant and investigation of the filtration method for the drying of slag and clay as main raw materials for preparing the charge for porous filler production. The possibility of using TPP slag as the raw material for the production of porous filler has been proved. The main benefits of using such wastes in the production process are environmental protection, conservation of raw resources for the production of finished products. According to the results of the research, insignificant values of the pressure drop confirm the application feasibility of the filtration drying as an energysaving method of the drying of slag and clay for preparing the charge for porous filler production. The influence of the temperature of the drying agent in the range from 313 to 373K on kinetic during filtration drying of slag and clay has been established. Obtained results are useful for the organization and intensification of the filtration drying process of slag and clay as the preliminary stage at the porous fillers production line. The qualitative new porous filler with the bulk density of 230 kg/m3 , the specific heat of 0.82 kJ/kg∙K, the thermal conductivity of 0.067 W/m∙K and compressive strength of 27.7 MPa has been obtained which can be used for the production of lightweight concretes.