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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.435 CiteScore™: 0.74

ISSN Print: 2150-3621
ISSN Online: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.2016019411
pages 165-185

EXPERIMENTAL INVESTIGATION OF THERMAL CONDUCTIVITY AND HEAT CAPACITY OF COAL-WATER FUEL

Valeriya A. Pinchuk
National Metallurgical Academy of Ukraine, 4 Gagarin Ave., Dnipro, 49600, Ukraine
ORCID ID: 0000-0001-7684-1867; ResearcherID: B-2458-2017
T. A. Sharabura
National Metallurgical Academy of Ukraine, 4 Gagarin Ave., Dnipro, 49600, Ukraine
Andrey Kuzmin
Institute for Engineering Thermal Physics, National Academy of Sciences of Ukraine, 2a Zhelyabov Str., Kiev, 03057, Ukraine
ORCID: 0000-0003-4091-4416

ABSTRACT

The paper is devoted to the study of the thermophysical properties of a coal-water fuel produced from high-ash coal or low-reactive coal. The thermal conductivity coefficient of the coal–water fuel was determined by combining a physical experiment with numerical modeling. It is shown that the thermal conductivity coefficient of the coal-water fuel varies from 0.41 to 0.81 W/(m·K) and its value increases with temperature. These values are significantly higher than the value of the same coefficient of natural coal. The coefficient depends on the metamorphic stage of the coal and on the amount of mineral impurities and water contained in the fuel. It was also determined that an increase in the fraction of mineral impurities in coal up to 10% leads to an increase in the thermal conductivity coefficient value to 9-10%. An increase in the water fraction in the coal-water fuel can lead either to an increase or to a decrease in the value of the thermal conductivity coefficient. The heat capacity of the coal-water fuel was investigated by using a calorimetric method. It is found that the heat capacity value of the coal-water fuel varies from 3.5 to 6.5 kJ/(kg·K). The value increases with temperature and depends on the fractions of mineral impurities and water in the fuel. The dependences of the thermal conductivity coefficient and heat capacity value of the coal-water fuel produced from coal of different metamorphic stages on the percentage fractions of water and coal phases in the fuel suspension and on the amount of mineral impurities are obtained from the analysis of experimental data.