Pyrolysis of Coal by Nanosecond Laser Pulses.

Autor: Kraft, Ya. V., Aduev, B. P., Nelubina, N. V., Volkov, V. D., Ismagilov, Z. R.
Zdroj: Coke & Chemistry; Sep2023, Vol. 66 Issue 9, p449-457, 9p
Abstrakt: The action of nanosecond laser pulses (wavelength 532 nm, pulse length 14 ns, pulse repetition rate 6 Hz, energy density of laser radiation 0.2–0.6 J/cm2) in G and Zh coal pellets is investigated, in an argon atmosphere. The gaseous products of sample pyrolysis include H2, CH4, C2H2, CO, and CO2. The content of the gaseous components is determined as a function of the laser energy density. In the range 0.2–0.4 J/cm2, the volume of flammable gases formed (referred to the mass loss of the sample) increases; at higher energy densities, practically no change in volume is observed. The gross calorific value of the flammable gases increases linearly from ~8–10 to 19 MJ/m3 with increase in energy density of the laser radiation from 0.2 to 0.6 J/cm2. A nanosecond pulse of energy density more than 0.4 J/cm2 results in intense ablation of the pellets containing 0.005 wt % polyvinyl alcohol. The coal pellets that contain no binder break down under the action of a nanosecond laser pulse of energy density exceeding 0.2 J/cm2. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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