Estimation of the effect of temperature, the concentration of oxygen and catalysts on the oxidation of the thermoanthracite carbon material
DOI:
https://doi.org/10.15587/1729-4061.2019.162474Keywords:
carbon monoxide, flue gases, thermoanthracite charge, graphitization, carbon material, manganese dioxide, oxidation, environmental catalysisAbstract
The effect of temperature, oxygen concentration and gas-air mixture flow rate on the oxidation efficiency of thermoanthracite carbon granular material with the formation of carbon monoxide and dioxide is considered. The modeled installation implies heating of the carbon material sample in a heat chamber with constant passing of the gas-air mixture obtained by adjusting the supply of air and carbon dioxide through the heating zone. The temperature range was 20–850 °C.
It is found that noticeable oxidation of carbon material in a heat chamber during purging of gas-air mixtures with an oxygen content of 8–21 % begins at temperatures above 500 °C, and significant concentrations of carbon monoxide are formed at temperatures of 600–800 °C. It is determined that, at an oxygen concentration of 14 %, the content of carbon monoxide in flue gases is minimal in the chosen range of oxygen concentrations of 8–21 %.
It is shown that the use of the gas mixture saturated with water vapor increases the efficiency of carbon monoxide reoxidation at temperatures of 650–850 °C, but when using the manganese catalyst, the catalytic effect of water vapor is not observed.
The use of the manganese catalyst applied as microcrystals on the carbon material surface is proposed, which provides a significant reduction of CO concentrations at temperatures of 500–850 °C. The disadvantage of the process is a 1.6–2.0 times increase in carbon material losses due to the acceleration of coal oxidation to CO and CO2.
The possibility to create certain conditions for the technological process of oxidation of thermoanthracite carbon granular material at enterprises to provide a reduction of the carbon monoxide content in oxidation products is presentedReferences
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Copyright (c) 2019 Yevgen Panov, Nikolai Gomelia, Olena Ivanenko, Andrii Vahin, Serhii Leleka
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