Shevchenko H.O., Cholyshkina V.V., Sukhariev V.V., Kurilov V.S., Lebed H.B. Granulometrical composition of the waste of thermal power plants

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Parent Category: Geo-Technical Mechanics, 2023

Category: Geo-Technical Mechanics, 2023, Issue 165

Geoteh. meh. 2023, 165, 72-83

https://doi.org/10.15407/geotm2023.165.072

 

GRANULOMETRICAL COMPOSITION OF THE WASTE OF THERMAL POWER PLANTS

Shevchenko H.O., Cholyshkina V.V., Sukhariev V.V., Kurilov V.S., Lebed H.B.

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

UDC 622.613.1

Language: English

Abstract. The direct use of TPP waste is construction is constrained by existing norms and standards for concrete, bricks and other products. Ash and slag raw materials need to be further processed, primarily classified by size. Waste from Prydniprovska and Kurakhivska TPPs was studied: dry fly ash, slag and stacked ash from the wet storage ash pond, and was considered as three separate products. The purpose of this study is to determine the particle size distribution of these wastes on the example of Prydniprovska and Kurahivska TPPs. This is necessary to determine the prospects for the use of this waste and the development of appropriate processing technologies.   As a result of the research, it was found that the current dry fly ash from electrostatic precipitators and cyclones at the two studied TPPs differs significantly in particle size distribution due to the different size and ash content of the combusted coal, different temperature conditions, blowing conditions, flue gas removal, etc. The physical and technical characteristics of the slag, its particle size and iron content were determined, which showed the possibility of its direct use as medium-strength crushed stone of the M600 grade in construction. Freshly poured ash into the ash pit has a significantly higher particle size than ash that has been stored for a long time.  This is not due to the presence of slag in the fresh ash, as the content of the fine class of -0.16 mm in slag is 1.7%. This is confirmed by the higher particle size of dry fly ash compared to stale ash. It established that although dry ash of Kurahivska and Prydniprovska TPPs has different composition, over time, under the destructive influence of the environment, it becomes smaller in size and its composition becomes similar at both ash dumps. In the averaged samples, the number of large classes of +0.25 mm does not exceed 1%, the ratio of +74 µm and -74 µm classes is approximately estimated at 20 : 80. The reason for the waste size during long-term wet storage is annual temperature fluctuations, chemical reactions, mechanical stresses under the weight of the upper layers and during the movement of raw materials. Vibrating screening has an advantage over other methods for classifying dry and stacked ash due to its high efficiency and the ability to separate narrow size range with a high content of unburned coal. 
Keywords: fly ash, slag, ash and slag waste.

REFERENCES 

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About the authors:

Shevchenko Нeorhii Oleksandrovych, Doctor of Technical Sciences (D.Sc.), Head of Department of Mechanics of Mineral Processing Machines and Processes, 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.

Cholyshkina Valentyna Vasylivna, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Mechanics of Mineral Processing Machines and Processes, 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.

Sukharіev Vitaliі Vitaliіovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher in Department of Mechanics of Mineral Processing Machines and Processes, 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.

Kurilov Vladyslav Serhiiovych, Junior Researcher in Department of Mechanics of Mineral Processing Machines and Processes, 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.

Lebed Hennadii Borysovych, Junior Researcher in Department of Mechanics of Mineral Processing Machines and Processes, 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.

 

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