Abstract
The underground coal gasification is a continually evolving technology, which converts coal to calorific gas. There are many important parameters in this technology, which are difficult to measure. These parameters include the underground cavity growth, amount gasified coal, and the leakage of input and output gaseous components into the surrounding layers during the coal gasification process. Mathematical modeling of this process is one of the possible alternatives for determining these unknown parameters. In this paper, the structure of the mathematical model of laboratory underground coal gasification process from the material balance aspect is presented. The material balance consists of mass components entering and leaving from the UCG process. The paper shows a material balance in the form of a general mass balance and atomic species balance. The material balance was testing by six UCG laboratory experiments, which were realized in two ex-situ reactors.
Highlights
The underground coal gasification (UCG) is a continually evolving technology and seems to be a great source of energy that can be obtained at a lower cost than in the case of using conventional mining methods
This paper described the proposal of the material/mass balance of the UCG process due to the information given above
Since total mass is conversed, a general mass balance in the overall UCG process can be written as follows: Gcoal + Gair + Goxygen = (1) Gcoal,unburned + Gash + Gsyngas + Gcondensate where Gcoal is the mass of input coal, Gair is the mass of air, Goxygen is the mass of oxygen, Gcoal,unburned is the mass of unburned coal, Gash is the mass of ash, Gsyngas is the mass of product gas, and Gcondensate is the mass of condensate
Summary
The underground coal gasification (UCG) is a continually evolving technology and seems to be a great source of energy that can be obtained at a lower cost than in the case of using conventional mining methods. The influence of the oxidant injection position (i.e., bottom and top position) to determine buoyant forces and product gas properties by a dynamic model of an underground cavity partially filled with an ash bed is described in [13] This dynamic model simulates the combined effect of transport phenomena (i.e., heat and mass) and chemical reactions during the UCG process. The use of the mass and heat balance calculations for thin coal seams in faulting zones of the coal basin is described in [24] These calculations are used to analyze the effectiveness of the UCG process and to obtain quantitative and qualitative indicators of the output parameters for the UCG products prediction. This paper described the proposal of the material/mass balance of the UCG process due to the information given above This balance is verified by measurements realized under laboratory conditions on the two physical models (i.e., ex-situ reactors). The elemental material balances will be based on the balance of elements such as C (carbon), H (hydrogen), N (nitrogen), O (oxygen), and S (Sulphur), which are dominant in the mass components of the total material balance
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