Activation of anthracite combustion by copper acetate: mechanism, effect of particle size and introduction method

• Published in: International journal of coal science & technology Vol. 10; no. 1; pp. 13 - 18
• Main Authors: Larionov, K. B., Mishakov, I. V., Berezikov, N. I., Gorshkov, A. S., Kaltaev, A. Zh, Slyusarskiy, K. V., Ruban, A. S., Vedyagin, A. A.
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01-12-2023; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Acetates; Activation; Analysis; Anthracite; Ash; Combustion; Copper; Copper acetate; Energy; Fossil Fuels (incl. Carbon Capture); Fractional composition; Geotechnical Engineering & Applied Earth Sciences; Ignition; Methods; Mineral Resources; Thermal analysis; Russia; Gas-phase products; Fractional composition; Activation mechanism; Copper acetate; Ignition; Activation; Combustion; Fuel underburning; Anthracite; Micro-explosions
• ISSN: 2095-8293; 2198-7823
• DOI: 10.1007/s40789-023-00573-w

This paper addressed the effect of copper acetate on the combustion characteristics of anthracite depending on the fractional composition of fuel and additive introduction method. Anthracite was impregnated with 5 wt% of Cu(CH
3
COO)
2
by mechanical mixing and incipient wetness impregnation. Four anthracite samples of different fraction with
d
 < 0.1 mm,
d
 = 0.1–0.5 mm,
d
 = 0.5–1.0 mm, and
d
 = 1.0–2.0 mm were compared. According to EDX mapping, incipient wetness impregnation provides a higher dispersion of the additive and its uniform distribution in the sample. The ignition and combustion characteristics of the modified anthracite samples were studied by thermal analysis and high-speed video recording of the processes in a combustion chamber (at heating medium temperature of 800 °C). It was found that copper acetate increases anthracite reactivity, which was evidenced by decreased onset temperature of combustion (Δ
T
i
) by 35–190 °C and reduced ignition delay time (Δ
τ
i
) by 2.1–5.4 s. Copper acetate reduces fuel underburning (on average by 70%) in the ash residue of anthracite and decreases the amount of CO and NO
x
in gas-phase products (on average by 18.5% and 20.8%, respectively). The mechanism for activation of anthracite combustion by copper acetate is proposed.