Abstract
The process of coal oxidation with applied Cu(СH3COO)2 additive was studied by the capillary incipient wetness impregnation method with 5% mass concentration. The experiment was conducted by thermogravimetric analysis at a heating rate of 2.5°C/min to a maximum temperature of 600°C in atmospheric air. It was established that application of the initiation additive leads to a significant reduction in the initial temperature of sublimation and active oxidation of volatile compounds (ΔTi = 78°C) and the oxidation end temperature (ΔTf = 64°C). It was established that in the presence of copper acetate the nature of coal oxidation reaction significantly changes (DTG data). The parameters of the coals oxidation process in the presence of copper acetate were determined, and an assumption was made about the presence of a composite catalytic effect.
Highlights
Coal is one of the most common types of fuel in the Russian energy industry [1]
It can be seen that application of Cu(CH3COO)2 initiation additive leads to a significant change in the nature of the process
The third and fourth stages are characterized by active oxidation of the released volatile compounds and the obtained coke residue (360-600°C)
Summary
Coal is one of the most common types of fuel in the Russian energy industry [1]. The most simple and widely used method of its transformation is direct combustion in boiler furnaces [2]. It is possible to increase the coefficient of fuel use due to application of catalytic combustion technology, which has a significant effect on the kinetics of the combustion process [3]. A comparative analysis of the effect of oxide additives and their precursors in the form of metal nitrates and metal chlorides on the process of coal oxidation showed that the precursors contribute to a greater decrease in the initial temperature of active oxidation of volatile substances and an increase of the reaction rate, shortening the residence time of the sample in its active oxidation area [4]. The mechanism of coal catalytic combustion is explained by the fuel reactivity activation, resulting from the close contact of the coal particles with the catalyst surface [2]. The paper presents the results of an experimental study of the coal oxidation process with Cu(CH3COO) initiation additive
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