ANALYSIS OF ROCK HEAT CONDUCTIONS AROUND COAL WITH MODELING OF UNDERGROUND COAL GASIFICATION OF LABORATORY SCALE

• Main Author: Badar, Wisam
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43824
• Institution: Institut Teknologi Bandung

Coal is an energy source that has the potential to replace oil and gas in the future. At a depth of 1,000 meters it is estimated that coal with great potential is still found (Sukhyar, 2012). One technology that can be implemented to extract coal at a depth of 300 to 1,000 meters is the underground coal gasification technology (UCG). UCG technology has potential risks to the environment and safety, one of which is the potential for instability in the rock around the opening hole due to heat transfer from coal heating. In the UCG technology carried out in this study, researchers conducted a UCG technology simulation on a laboratory scale by heating coal and side rocks modeled with concrete. Therefore, the researcher wants to determine the conductivity (k) value in the surrounding rocks that occur due to coal heating, so that an analysis of it can be carried out. From the experimental results, a graph of coal composite temperature with concrete and concrete temperature will be obtained with respect to the experiment time, then the data obtained are taken three time points of observation which are then processed by the euler method with the finite difference method equation using the Matlab R2016A software so that the thermal conductivity value (k ) coal and concrete composites are 0.48 W/m.°C and 0.53 W/m.°C for temperatures from 20-100°C, then 0.68 W/m.°C for temperatures from 100-200°C . Then the thermal conductivity (k) of the concrete is obtained as 0.35 W/m.°C and 0.5 W/m.°C for temperatures from 20-100°C, then 0.6 W/m.°C for temperatures 100-200°C. There is a difference in the k value of the test results with the k value in the literature with an average error of 3.7% for composites, and 2.5% for concrete.