Mathematical model of coal combustion and gasification in a passage of an underground gas generator

Coal combustion and gasification processes in a passage of an underground gas-generator is examined at a stage of approximate steady state. The passage dimensions (cross-sectional area and the fraction of the surface covered by coal and rocks) is assumed known and is determined by mine cave-in processes. The water flow into the gasification passage is also assumed known. The problem is to determine the composition, flow rate, temperature and pressure of the air blast along the passage and at the exit from the values at the beginning of the passage. A mathematical model was developed for this process, a computer program was written, and calculations were performed to illustrate that the model corresponds to these processes.