Study On The Influencing Factors Of CO Release Rate From Coal Slow Oxidation

In order to study the relationship between the slow oxidation of coal and the release rate of CO,the coal samples in the goaf were collected as the experimental research objects.Different experimental conditions are changed to simulate the actual spontaneous combustion environment of the coal sample in the goaf.At the same time,the numerical calculation method is used to calculate the CO release rate during the slow oxidation process of the coal sample under various conditions.On this basis,the main factors determining the CO release rate by using the factor model are: temperature,O2 concentration,average particle size,air discharge.The influence factor of O2 is 0.897,the temperature factor is 0.895,the air flow rate is 0.827 and the particle size is 0.773.According to the multi-factor coupling formula of CO release rate and the experiment of oxidation heating,the interaction between temperature,particle size and oxygen concentration is a negative effect,which weakens the value of CO release rate.The interaction with air flow is a strong positive effect,which makes the value of CO release rate significantly increase.O2 concentration,temperature and air flow rate play a leading role in the production of CO and verify the calculation results of grey correlation.Industrial and elemental analysis,DSC characteristic curve and other experiments were used to study five kinds of coal samples with different metamorphic degrees.The results show that at the same heating rate,with the increase of water content(Mad)and volatile matter(Vad),the metamorphism degree of coal decreases,the apparent activation energy decreases,the spontaneous combustion tendency of coal increases,the absorption peak value of coal sample shows an upward trend,the zero point shifts to low temperature,the CO release rate increases,and vice versa.The study of CO production mechanism of coal under different oxidation and temperature rise conditions provides an important theoretical basis for guiding the prevention of mine fire.Figure 29;Table 17;Reference 53...