ANALYSIS OF THE INFLUENCE OF COAL PARTICLE SIZE ON THE R70 VALUE IN COAL SWELLING TESTS USING THE ADIABATIC HEATING METHOD
Spontaneous combustion of coal is a phenomenon where coal ignites on its own due to the oxidation process. One way to measure the spontaneous combustion tendency of coal is by testing with an adiabatic heating device. The oxidation process of coal is studied at temperatures between 40-70°C. In this...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/86352 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Spontaneous combustion of coal is a phenomenon where coal ignites on its own due to the oxidation process. One way to measure the spontaneous combustion tendency of coal is by testing with an adiabatic heating device. The oxidation process of coal is studied at temperatures between 40-70°C. In this research, the adiabatic heating method proposed by Beamish (2000) is used, referring to SNI 9239:2023. The coal is initially heated for 16 hours using nitrogen at a flow rate of 0.1 L/min at a temperature of 110°C, followed by coal combustion using oxygen at a flow rate of 0.05 L/min with an initial oxidation temperature of 40°C. The test results show that coal from PT Adaro Indonesia has R70 values of 18.92°C/hour, 19.11°C/hour, and 19.66°C/hour. The spontaneous combustion tendency of coal is influenced by intrinsic factors such as moisture, pyrite, particle size, and others, as well as extrinsic factors such as heat, airflow, environmental conditions, and other factors. The analysis of coal characteristics in relation to R70 values indicates that ash content has a negative correlation with R70 values, volatile matter has a positive correlation with R70, calorific value has a negative correlation with R70, and fixed carbon has a negative correlation with R70. |
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