Inhibition effect of N2/CO2 blends on the minimum explosion concentration of agriculture and coal dusts

Minimum explosion concentration (MEC) of three agriculture dusts and two coal dusts was studied via a 20-L explosion chamber to reveal the role of gaseous inhibitors. Both active method (CO2 diluting air) and passive method (CO2 replacing O2) were used. The TG and DTG thermal analysis tests were con...

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Bibliographic Details
Published in:Powder technology 2022-02, Vol.399, p.117195, Article 117195
Main Authors: Wu, Wenying, Huang, Weixing, Wei, Aizhu, Schmidt, Martin, Krause, Ulrich, Wu, Dejian
Format: Article
Language:English
Subjects:
Agriculture
Carbon dioxide
CO2/N2 ratio
Coal
Combustion
Combustion kinetics
Diffusion rate
Explosion characteristics
Explosion criterion
Explosions
Inerting effect
Overpressure
Oxygen
Pyrolysis
Specific heat
Thermal analysis
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Summary:Minimum explosion concentration (MEC) of three agriculture dusts and two coal dusts was studied via a 20-L explosion chamber to reveal the role of gaseous inhibitors. Both active method (CO2 diluting air) and passive method (CO2 replacing O2) were used. The TG and DTG thermal analysis tests were conducted to study the pyrolysis and combustion characteristics of dust samples. An alternative explosion criterion based on combustion duration time was used to determine MEC, and compared with the standardized overpressure method. Under 10-kJ ignition condition, as oxygen mole fraction (XO2) decreased from 21% to 10%, MEC of agriculture dusts and coal dusts respectively increased by around 5 times and 2 times. The active inerting method with a lower N2/CO2 ratio was found to have a better suppression effect on the explosion of the five carbonaceous dusts because the blend has a higher specific heat and a lower oxygen diffusion rate. [Display omitted] •The pyrolysis/combustion characteristics of dust samples were analysed via TG tests.•A novel explosion criterion based on combustion duration time was proposed to determine MEC.•A linear correlation was found between ignition energy and adiabatic index.•MEC of biomass and coal dusts respectively increased by over 5 times and 2 times as XO2 decreased from 21% to 10%.•The active inerting method with a lower RN2/CO2 had a better suppression effect.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2022.117195