O. N. Fedyaeva, S. A. Semenova, S. A. Alekhin, A. P. Grebennikov, S. A. Lizunov
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Abstract
The paper studies the oxidation of coals with different degrees of coalification in an oxygen atmosphere and water–oxygen fluid (oxygen excess ratio 1.22–1.43) when heating the reactor at a constant rate (1 deg/min) to 550°C. From the time dependences of the temperature and pressure of the reaction mixtures, it follows that the addition of water to oxygen reduces the ignition temperature of coals and intensifies their combustion. This effect is most pronounced for coals with a high degree of coalification. At certain values of total heat release, the oxidation of coals in both the O2 atmosphere and water–oxygen fluid (H2O–O2 fluid) occurs by the thermal explosion mechanism. The influence of the composition of organic and mineral components of coals on their ability to ignite is discussed.
期刊介绍：
Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.
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