Oxygen consumption of coal at low temperatures

In order to understand the characteristic of coal-oxygen reaction, oxygen consumption of coal at low temperatures is tested. The results show that the change of oxygen consumption with the rise of temperature is a non-liner process. Oxygen consumption decreases with the rising of coal temperature from 30 °C to 50 °C and reaches the minimum at 50 °C. Then, it increases steadily and rapidly upon 50 °C. This characteristic is more obvious for high rank coals. The difference of oxygen consumption at the same temperature is significant for different rank coals. The test shows the difference of the coal samples tested in the paper reaches 78.6% at 100 °C. Based on the theory of coal-oxygen reaction, the phenomenon above is analyzed in the physical and chemical character, and the appearance of coal-oxygen is complex.