Lapshyn Ye., Shevchenko O. Determining the possibilities of using fly ash of DTEK Рrydniprovska ТРР as additional raw material

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Parent Category: Geo-Technical Mechanics, 2024

Category: Geo-Technical Mechanics, 2024, Issue 171

Geoteh. meh. 2024, 171, 31-46

https://doi.org/10.15407/geotm2024.171.031

 

DETERMINING THE POSSIBILITIES OF USING FLY ASH OF DTEK PRYDNIPROVSKA TPP AS ADDITIONAL RAW MATERIAL

 Lapshyn Ye.

Shevchenko O.

M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

UDC 622.33: 621.311.22.002.84

Language: English

Abstract. Accumulated ash and slag waste (ASW) from fuel and energy complex facilities in Ukraine are considered potentially dangerous sources of environmental pollution in adjacent areas. More than 80% of the mineral composition of coal during combustion passes into fly ash (FA), up to 20% into slag. Ashes of coal-fired thermal power plants of Ukraine contain carbon in an amount of 5% to 30%. The increased content of unburned ash in ash and the complex granulometric composition do not allow for the widespread use of ash in the construction industry in large volumes (for concrete - it is prohibited by standards). At the same time, ash is a valuable raw material for recycling. For widespread use in the construction sector, it is necessary to bring the quality of ash to indicators that meet the standards. The conducted studies of fresh (dry) fly ash showed the prospects of its processing, the products of which are of industrial interest. The unburned carbon remaining in the ash is distributed unevenly by the size classes of the original product, the samples contain from 18.53% to 30.48% of unburned coal. The ash content is most in the +0-0.05 mm class, from 44.97% to 81.47%. If the ash is divided by the boundary size of 0.05 mm, it is possible to obtain an oversize product with a coal content of C_c from 6.05% to 14.6% with an ash content of C_a from 2.41% to 24.87%. Dry ash does not require dehydration and drying, additional transportation to the processing site. When processing dry ash, an important factor is stopping the build-up of the fly ash accumulators. The products of the complex technology of processing dry fly ash are the silicate part and carbon. The carbon part is presented in the form of dust-like particles of coke, which after extraction from the ash can be returned for further combustion. The silicate part of the ash requires additional research, since its mineralogical composition, its value and the feasibility of inclusion in the technology of complex processing for the purpose of subsequent disposal have not been determined. With appropriate methods of use and available technologies, ASW becomes a high-quality, cheap, accessible, wear-resistant, frost-resistant substitute for natural materials, having binding properties that are used in world practice in the production of concrete, bricks, asphalt concrete mixtures, ceramic tiles, thermal insulation, etc.

Keywords: coal, ash and slag waste from thermal power plants, coal combustion products, fly ash, processing experience, fly ash processing, classification.

 

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About the authors:

Lapshyn Yevhen, Doctor of Technical Sciences (D.Sc.), Senior Researcher, Principal Researcher in Department of Ecology of Natural Resources Development, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Shevchenko Oleksandr, Doctor of Technical Sciences (D.Sc.), Senior Researcher, Senior Researcher in Department of Geomechanical Basis of Open-Pit Technology, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Science of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. (Corresponding author)

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