Chоlyshkina V.V., Kostyrіa S.V. Determination of dependencies for dewatering ash and slag waste of heat electric power stations on equipment parameters
- Details
- Parent Category: Geo-Technical Mechanics, 2019
- Category: Geo-Technical Mechanics, 2019, Issue 146
Geoteh. meh. 2019, 146, 18-27
https://doi.org/10.1051/e3sconf/201910900015
DETERMINATION OF DEPENDENCIES FOR DEWATERING ASH AND SLAG WASTE OF HEAT ELECTRIC POWER STATIONS ON EQUIPMENT PARAMETERS
1Chоlyshkina V.V., 1Kostyrіa S.V.
1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine
UDC 622.794.002.5
Language: English
Abstract.
The integrated processing of ash and slag from coal-fired thermal power plants attracts much attention. Waste treatment will reduce the burden on existing storage facilities, carry out the return of unborn coal to the boilers of power plants, and obtain a valuable raw material resource for construction, ferrous and non-ferrous metallurgy. At all thermal power plants in Ukraine, the utilization and storage of ash and slag is carried out hydraulically. Therefore, for all processing technologies, the dehydration of finely divided raw materials is relevant.
The article presents the results of laboratory tests of some new device for dewatering ash and slag waste. The analysis of experimental data on the dehydration of ash and slag waste (fly ash) of the Kramatorsk Thermal Power Plant with a size of -5 + 0.05 mm in a dewatering device with a complex effect was represented in the article. It uses a set of effects on raw materials: the imposition of vibrations, electric fields and vacuation. The dehydration efficiency depends on how the parameters of these effects are selected.
Using the linear correlation method, it was found that the dependences of humidity on each of the variable parameters are of a weak nonlinear character. The exact and approximate equations of multiple regression were obtained for the practical estimation of humidity under the combined action of all variable factors. The research results showed that the use of a complex action device is promising for the dehydration of ash and slag waste. The developed generalized regression model of changes in the final moisture content (Wcon) is suitable for assessing the decrease in humidity of dump fly ash when the process parameters change in the range: Wish = 30%, angle of inclination of the working body α = 5 degrees. and changing device parameters in the ranges: vibration exciter frequency ω = 1500 ÷ 3000 rpm, forced excitation vibration value F = 0.5 ÷ 0.8 kN, electric field voltage U = 25 ÷ 100 V, vacuum pressure chamber P = 0.063 ÷ 0.1 MPa. With a grain size of raw materials + 0.63-0.05 mm, a dehydrating device with a complex effect reduces humidity from 30 to 9%.
Keywords: vibration, evacuation, electroosmosis, dehydration, integrated method.
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About the authors
Chelyshkina Valentyna Vasylivna, Candidate of Technical Sciences (Ph.D), Senior Researcher of the Department of Mechanics of Mineral Processing Machines and Processes, Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Science of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Kostyria Serhii Volodymyrovych, Master of Science, Junior Researcher in the Department of Geodynamic Systems and Vibration Technologies, Institute of Geotechnical Mechanics named N. Poljakov of National Academy of Science of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
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