Abstract
The influence of two different methods of kinetic analysis on obtained values of kinetic constants of coal oxidation process was studied. The oxidation of T-grade bituminous coal of Kuznetskiy deposit and 2B-grade lignite of Borodinskoe deposit was investigated by means of thermogravimetric analysis. All measurements were carried out with heating rates 2,5, 10, 25 and 40 K/min in temperature range 300-1100 K in air medium. The dependences of activation energy and frequency factor on conversion were obtained using two isoconversional methods: differential method of Freidman and integral method of Kissinger-Akahira-Sunose. The average values of activation energy which were obtained by KAS method were higher by 14.5 % for bituminous coal and 23.3 % for lignite in comparison with values obtained by Freidman method. The same relations were observed for frequency factor values.
Highlights
Energy consumption in the world is steadily increasing every year for the last 50 years [1]
Thermal analysis Experimental TG and DTG-curves for samples of bituminous coal and lignite at all heating rates are presented in figure 2
The oxidation process is represented by two stages for samples of bituminous coal and lignite
Summary
Energy consumption in the world is steadily increasing every year for the last 50 years [1]. Different methods may be applied to reduce pollution: from improving exploitation parameters [3] of existing equipment to completely new technologies like gasification [4, 5], and using of coal-waterslurry [5, 6] or chemical looping combustion [7]. To effectively apply these methods the precise information on coal conversion kinetics is needed.
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