Thermal decomposition of coal and coal-enrichment wastes

Lyrshchikov, S. Yu.; Стрижак, П. А.

doi:10.3103/s1068364x16070048

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…Kinetic decomposition parameters (activation energy and pre-exponential factor) were calculated, similar to the methodology used in [30]. We assumed that the initial product A decomposes to form intermediate product B and volatile P 1 .…”

Section: 93mentioning

confidence: 99%

Thermal decomposition and oxidation of coal processing waste

2018

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To expand the database of kinetic parameters used for modeling the ignition of coals and their processing waste, promising coal-water slurry and coal-water slurry containing petrochemicals, studies have been performed on an experimental setup using thermal gravimetric analysis. The research into coals of various ranks (flame, gas, coking, low-caking, and non-baking) and their processing waste (filter cakes) has yielded the decomposition parameters of the organic matter of coal and the formation of volatile substances as well as the oxidation parameters of the coke residue of all the coals and filter cakes under study. The studies cover the temperature range of the burning processes: 450-1300 K (for low-, medium-, and high-temperature burning modes). We have ascertained the dependence of kinetic parameters (pre-exponential factor and activation energy) describing the thermal decomposition of the organic matter of coal on the rank of coals and filter cakes. The findings show that the kinetic parameters describing the thermal decomposition of the organic matter of coal and its processing waste are practically the same. The thermokinetic parameters of coke residue oxidation are close for all the coals under study but they differ significantly for coke residue of filter cakes. The values of thermokinetic parameters obtained in the research are necessary to devise adequate physical and mathematical models and perform numerical studies (for mathematical modeling) of fuel slurry combustion processes in the combustion chambers of power plants.

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Section: 93mentioning

confidence: 99%

Thermal decomposition and oxidation of coal processing waste

2018

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“…The cheaper option is blending coal with some highly reactive fuel to promote its ignition. The second component for such a mixture could be brown coal, biomass , and wastes of different types. − Recent studies revealed that application of liquid additives − allow significant improvement of both ignition and combustion characteristics of initial coal even with a small mass of additive: up to 10 wt % according to ref and up to 5 wt % according to ref (with the optimum value at 3 wt %). Furthermore, it has been theorized that combined application of pyrolysis oil with coal at power plants will allow significant reduction of the contribution to the greenhouse effect.…”

Section: Introductionmentioning

confidence: 99%

“…The common method for studying the effect of different additives on the reactivity of an obtained mixture with coal is thermogravimetric analysis. ,,,, The promoting effect is assessed via comparison of characteristic parameters like ignition and burnout temperatures as well as values of kinetic constants. ,, However, conditions in thermogravimetric analyzer chambers differ significantly from those of actual energy equipment in terms of heating rate and oxidizer flow rate pattern. That is why many articles on combustion of different fuels in pilot-scale setups , or laboratory units with close to actual equipment conditions , have emerged recently.…”

Section: Introductionmentioning

confidence: 99%

Activation of Anthracite Combustion Using Pyrolysis Oil from Thermal Conversion of Waste Car Tires

et al. 2021

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The ignition and combustion of anthracite modified by the addition of pyrolysis oil obtained during thermal processing of waste car tires (WCTs) had been studied. The mass fraction of WCT pyrolysis oil was varied in the range from 5 to 30 wt %. The additive was applied by the drop impregnation method. Ignition and combustion of obtained samples were carried out in a combustion chamber at temperatures of the heating medium T g = 600–800 °C. The gas-phase combustion products were analyzed using an in-line gas analyzer. The application of WCT pyrolysis oil as a combustion modifier contributed to an increase in the reactivity of anthracite, which was expressed in a decrease in the minimum ignition temperature (by 23–104 °C) and a reduction in the ignition delay time. The high-speed video recording indicated that the combustion of both initial and modified with 5 wt % pyrolysis oil anthracite samples was realized in oxidation mode. For samples with more than 10 wt % pyrolysis oil additive, the formation of a visible flame was observed near the sample surface. With an increase in the mass fraction of the additive, the rate of combustion front propagation was increased. The application of WCT pyrolysis oil as a combustion modifier also contributed to the reduction or even the almost complete elimination of unburnt carbon content in the ash residue formed after anthracite combustion.

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