THE EFFECT OF MOISTURE CONTENT ON THE HARDGROVE GRINDABILITY INDEX OF COAL FROM THE KOLUBARA BASIN
Abstract
In order to obtain data on the effect of moisture content on the grindability of coals, experimental research was conducted. The experiment included six samples of coal from the Kolubara basin. The samples were selected based on experimentally obtained values of their Hardgrove grindability index (HGI), in order to cover the entire range of experimental HGI values. In addition to determining the HGI, proximate, and petrographic analyses were performed on all samples.
Lignites are naturally tough, soft, and greasy when in a moist state. By reducing the moisture content, lignites become more brittle. For this reason, HGI values have different values depending on the moisture content at which they are determined.
The Hardgrove grindability index of coal (HGI) has a nonlinear dependence on the moisture content of the coal. All curves have two inflection points, one minimum and one maximum value of HGI in the tested range. The minimum values of HGI are in the range of 15 – 22 [%] of the m...ass fraction of total moisture in coal, while the maximum values of HGI are for a total moisture content of 5 – 13 [%].
In the case of high moisture content in coal, the obtained high values of HGI may not reflect the true grindability of the coal. These values could be misleading and not necessarily indicative of the coal's inherent characteristics. Instead, they could be a result of the imperfections in the Hardgrove method used to determine the grindability index of coal with high moisture content.
Keywords:
coal / lignite / moisture / Hardgrove grindability index (HGI)Source:
Thermal Science - Online First, 2024Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200105 (University of Belgrade, Faculty of Mechanical Engineering) (RS-MESTD-inst-2020-200105)
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Mašinski fakultetTY - JOUR AU - Obradović, Marko AU - Karličić, Nikola AU - Todorović, Dušan AU - Radić, Dejan AU - Jovović, Aleksandar PY - 2024 UR - https://machinery.mas.bg.ac.rs/handle/123456789/7873 AB - In order to obtain data on the effect of moisture content on the grindability of coals, experimental research was conducted. The experiment included six samples of coal from the Kolubara basin. The samples were selected based on experimentally obtained values of their Hardgrove grindability index (HGI), in order to cover the entire range of experimental HGI values. In addition to determining the HGI, proximate, and petrographic analyses were performed on all samples. Lignites are naturally tough, soft, and greasy when in a moist state. By reducing the moisture content, lignites become more brittle. For this reason, HGI values have different values depending on the moisture content at which they are determined. The Hardgrove grindability index of coal (HGI) has a nonlinear dependence on the moisture content of the coal. All curves have two inflection points, one minimum and one maximum value of HGI in the tested range. The minimum values of HGI are in the range of 15 – 22 [%] of the mass fraction of total moisture in coal, while the maximum values of HGI are for a total moisture content of 5 – 13 [%]. In the case of high moisture content in coal, the obtained high values of HGI may not reflect the true grindability of the coal. These values could be misleading and not necessarily indicative of the coal's inherent characteristics. Instead, they could be a result of the imperfections in the Hardgrove method used to determine the grindability index of coal with high moisture content. T2 - Thermal Science - Online First T1 - THE EFFECT OF MOISTURE CONTENT ON THE HARDGROVE GRINDABILITY INDEX OF COAL FROM THE KOLUBARA BASIN DO - 10.2298/TSCI230529145O ER -
@article{ author = "Obradović, Marko and Karličić, Nikola and Todorović, Dušan and Radić, Dejan and Jovović, Aleksandar", year = "2024", abstract = "In order to obtain data on the effect of moisture content on the grindability of coals, experimental research was conducted. The experiment included six samples of coal from the Kolubara basin. The samples were selected based on experimentally obtained values of their Hardgrove grindability index (HGI), in order to cover the entire range of experimental HGI values. In addition to determining the HGI, proximate, and petrographic analyses were performed on all samples. Lignites are naturally tough, soft, and greasy when in a moist state. By reducing the moisture content, lignites become more brittle. For this reason, HGI values have different values depending on the moisture content at which they are determined. The Hardgrove grindability index of coal (HGI) has a nonlinear dependence on the moisture content of the coal. All curves have two inflection points, one minimum and one maximum value of HGI in the tested range. The minimum values of HGI are in the range of 15 – 22 [%] of the mass fraction of total moisture in coal, while the maximum values of HGI are for a total moisture content of 5 – 13 [%]. In the case of high moisture content in coal, the obtained high values of HGI may not reflect the true grindability of the coal. These values could be misleading and not necessarily indicative of the coal's inherent characteristics. Instead, they could be a result of the imperfections in the Hardgrove method used to determine the grindability index of coal with high moisture content.", journal = "Thermal Science - Online First", title = "THE EFFECT OF MOISTURE CONTENT ON THE HARDGROVE GRINDABILITY INDEX OF COAL FROM THE KOLUBARA BASIN", doi = "10.2298/TSCI230529145O" }
Obradović, M., Karličić, N., Todorović, D., Radić, D.,& Jovović, A.. (2024). THE EFFECT OF MOISTURE CONTENT ON THE HARDGROVE GRINDABILITY INDEX OF COAL FROM THE KOLUBARA BASIN. in Thermal Science - Online First. https://doi.org/10.2298/TSCI230529145O
Obradović M, Karličić N, Todorović D, Radić D, Jovović A. THE EFFECT OF MOISTURE CONTENT ON THE HARDGROVE GRINDABILITY INDEX OF COAL FROM THE KOLUBARA BASIN. in Thermal Science - Online First. 2024;. doi:10.2298/TSCI230529145O .
Obradović, Marko, Karličić, Nikola, Todorović, Dušan, Radić, Dejan, Jovović, Aleksandar, "THE EFFECT OF MOISTURE CONTENT ON THE HARDGROVE GRINDABILITY INDEX OF COAL FROM THE KOLUBARA BASIN" in Thermal Science - Online First (2024), https://doi.org/10.2298/TSCI230529145O . .