Abstract
The paper presents the results of a study of the process of spontaneous combustion of partially carbonized lignite and sorbent from coal, depending on the particle size. To determine the critical conditions of spontaneous combustion and the effective kinetic parameters of the process proceeding along the thermal mechanism, a special experimental setup was used. The results of the study indicate the influence of particle size on the time of spontaneous combustion and on the rate of oxidation of coal matter. A mathematical model of spontaneous combustion of coal matter is developed. The model uses the spatial nonstationary heat conduction equation, in which the heat release in the process of coal oxidation is taken into account by setting a heat source based on the experimentally obtained kinetic parameters of the spontaneous combustion process - effective activation energy and the pre-exponential factor.
Highlights
Since the appearance of the first coal mines, there is a worldwide problem of spontaneous combustion of coal fuel
For a given coal matter, as for Itatsky-7, the rate of spontaneous combustion decreases with increasing particle size
A study was conducted to reveal the dependence of the process of spontaneous combustion on the particle size of the partially carbonized lignite and sorbent from coal
Summary
Since the appearance of the first coal mines, there is a worldwide problem of spontaneous combustion of coal fuel. The oxidative processes developing at the same time lead to its spontaneous combustion. Fires resulting from spontaneous combustion of coal create dangerous conditions for humans and lead to large economic losses. In China, the annual loss of coal resources as a result of spontaneous combustion accounts for about a seventh of the annual production, and in addition to direct economic damage is fraught with serious environmental consequences. The spontaneous combustion is the main cause of fires in fuel storages and coal supply routes (50-60%), for this reason, every sixth fire occurs at CHP plants and boilers. In the region of Siberia and the Far East, about 30% of manmade fires in industrial plants and 50% of fires in thermal power plants occur due to spontaneous combustion [2]
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