Study on the ignition point of superfine pulverized coal by the thermogravimetry and thermal microscope
Investigating the impact of different measurements and calculation methods on the ignition point of pulverized coal is essential for guiding both theoretical researches and industrial applications.This study involved three representative types of coal—Tieling lignite,Inner Mongolia bituminous coal and Henan anthracite.The coal samples were finely pulverized to achieve varying particle sizes.These samples were then exposed to different atmospheres,including air,pure oxygen,carbon dioxide-enriched oxygen and nitrogen-enriched oxygen,and their ignition points were examined using a thermal microscope.Additionally,thermogravimetric curves were obtained at heating rates of 10 and 20℃/min using a termogravimetric analyzer.The ignition point data were derived through the tangent and Constant-DTG method.The results reveal that a nitrogen-enriched oxygen atmosphere is more favorable for ignition compared to a carbon dioxide-enriched oxygen atmosphere.Furthermore,superfine pulverization demonstrates the most significant improvement in lowering the ignition temperature for anthracite.At the same heating rate,the ignition point obtained by the thermogravimetric tangent method surpasses that obtained by the fixed weight-loss method and notably exceeds the values observed through thermal microscopy.The thermogravimetric analysis indicates that with a higher temperature rise rate,the ignition point value increases,but the required ignition time decreases.
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