STUDY OF THE EFFECT OF PARTICLE SIZE DISTRIBUTION BETWEEN 88 MICRON TO 2110 MICRON ON THE SPONTANEOUS COMBUSTION POTENTIAL BY ADIABATIC HEATING METHOD ON LABORATORY SCALE
Coal spontaneous combustion is the condition of coal burning without external ignition. This phenomenon generally occurs in coal piles that cause coal heating by itself, such as in stockpiles and during the coal transport process. One of the intrinsic factors that influence the potential for self...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/85407 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Coal spontaneous combustion is the condition of coal burning without external ignition. This
phenomenon generally occurs in coal piles that cause coal heating by itself, such as in
stockpiles and during the coal transport process. One of the intrinsic factors that influence
the potential for self-ignition is particle size. This research focuses on the effect of coal
particle size distribution on the self-ignition potential of coal. The coal tested was of
Subbituminous B rank. The particle size is distributed between 88 ?m to 210 ?m with three
distribution variations. This research uses the adiabatic heating method which has steps
such as drying the coal with 0.1 L/min nitrogen flow at 110°C for 16 hours, then testing the
process by flowing oxygen with a flow of 0.05 L/min while increasing the coal temperature
gradually from 40°C. The parameters obtained through this method are R70 index and
activation energy. The three size distribution variations have their own skewness of -1.08;
0.2; 076. The R70 index and activation energy obtained for particle size distribution
skewness of 1.08; 0.2; 076 are 10.1 °C/h; 14.63 °C/h; 23.1 °C/h and 69.79 kJ/mol; 59.83
kJ/mol; 58.02 kJ/mol, respectively. The higher the particle distribution towards the size of
88 ?m, the R70 index tends to increase and increase the potential for self-ignition due to the
increase in the surface area of the oxidised coal, but inversely proportional to the activation
energy which tends to decrease. The higher the particle distribution towards the size of 210
?m, the R70 index has a tendency to decrease, as well as a decrease in the potential for selfburning,
but inversely proportional to the activation energy which tends to increase due to
a decrease in the reaction rate of coal with oxygen. |
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