The Optimization of the Conditions of Thermal and Pressing Dewatering and the Effect of Conditions on the Burning Characteristic of Lignite

The paper was to optimize the conditions of thermal and pressing dewatering of lignite based on four factors three levels of Orthogonal experiment and to study the effect of conditions on lignite burning characteristic. The results show that the importance to the dehydration rate of lignite is in turns, temperature, pressing time, pressure, particle size; and the optimizing condition is temperature 220°C, pressure 6MPa, pressing time 40min, and the particle size ratio 3 to 7. Thermo gravimetric analysis had been carried out to study the burning characteristic of the dewatered lignite. The results show that the burning characteristic temperatures: Preliminary release of volatile temperature, ignition point, point of maximum weightlessness rate, burnout temperature, are found to be an obvious rise, but the burnout temperature; and the four burning characteristic temperatures will be elevatory with the temperature elevated, pressing time extended and pressure increased.