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MATERIAL AND ENERGY BALANCE OF THE UCG PROCESS IN THE LABORATORY CONDITIONS
Abstract
Structure of the mathematical model of underground coal gasification process in terms of material and energy (heat) balance is presented in this paper. Base inputs of gasification process are coal (coal model) and oxidant (a mixture of oxygen and air), which appropriate combination has to ensure the best possible conditions for the gasification process. The expected energy output from coal gasification process is a synthetic gas - syngas. Components such as ash, tar and unburned coal are side outputs of the proces s. All inscribed components create balance of the heat aggregate respectively process. Energy that enters into process (coal, oxidizer) is equal to output energy (syngas) and residual energy (unburned coal, ash, tar). Control of expenditure and energy consumption (compliance with the law of conservation of energy) is based on material balance and heat balance of the process which is used for the purpose of tracking te mperature changes. Heat balance allows us to track the impact of temperature changes on the gasification process and the proportion of obtained energy in the form of the gas from the process. The physical and chemical heat input and output components of the process are taken into consideration. Calculating material and heat balance of the underground coal gasification process is one of the most important indicators for the evaluation of its effectiveness. Physical model (experimental equipment), wh ich simulates the cond itions of the real coal-seam in the bearing geometric similarity , has been created for better understanding and analysis of the gasification process. Several experiments re presenting specific conditions of the gasification were performed using created physical model. Experiments have been carried out at the di fferent arrangements of the coal charge and regulatory mode. Accomplished experiments we re evaluated in terms of gas production with the greatest heat conten t, which is represented by th e largest share of heating element in the output part of the heat balance.
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