413 / 2018-07-27 12:15:13

Evolution of husk char's physical and chemical structure under CO2 atmosphere

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In this paper, a competitive mechanism between high temperature crystallization and CO2 activation anti-crystallization of husk pyrolysis char has been studied by making the experiment that the activation of husk char from moderate temperature slow pyrolysis with CO2. The results show that the pore structure and specific surface area of the husk pyrolysis char are more and more abundant with the addition of gasification agent and the increase of temperature; When the gasification temperature reaches 850 ℃, it’s specific surface area is as high as 302.9192 m2/g.In the temperature range of 650 ° C ~ 750 ° C, the pyrolysis char crystallite growth rate is basically unchanged,but the average thickness of the grain is decreasing and the growth rate is greatly increased under the influence of temperature in the temperature range of 800 °C to 850 °C.However,the growth rate of the grain in the CO2 atmosphere has no significant change, so this indicates that high temperature dominates in the result of competition between gasification and high temperature for the crystallization of pyrolytic char.