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Abstract
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 presented
Highlights
In the technological processes with heat treatment of carbon, such as coking, graphitization, coal combustion, carbon oxides are always formed if gas mixtures contain oxygen at higher or lower concentrations
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
At an oxygen concentration of 14 %, the content of carbon mo noxide is minimal in the chosen range of oxygen concentrations
Summary
In the technological processes with heat treatment of carbon, such as coking, graphitization, coal combustion, carbon oxides are always formed if gas mixtures contain oxygen at higher or lower concentrations. These processes are accompanied by the formation of carbon dioxide and toxic carbon monoxide. No less acute problem is greenhouse gas emission. In recent years there has been no decrease, but an increase in carbon oxide emissions to the atmosphere due to a significant reduction in volumes of natural gas used and growth of solid fuel combustion. Atmospheric pollution with carbon mono xide in electrode production by graphitization is significant [1, 2]
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