OFR 53-83 - Investigation of Extinguishing Agents for Coal Dust Explosion. 1983.
Dates
Publication Date
1983
Summary
Eight extinguishing powders KC1, were tested on five types of diffusion flames. The effect of flame temperature on the inhibition efficiency was investigated by varying the oxygen index of the flame supporting atmosphere. In addition a spectrographic investigation of powder - flame dissociation products was carried out on the methane /air /ABC (NH4H2PO4) flame. Dissociation products for this flame included PO, PH, NH, and Na. It is concluded that the main factor to be considered in the efficiency of the powder is the flame temperature. Purple K (KHCO3) was typically inefficient in low temperature flames and very efficient in high temperature flames. On the other hand, ABC . (NH4H2PO4) was found to lose its efficiency at high temperature [...]
Summary
Eight extinguishing powders KC1, were tested on five types of diffusion flames. The effect of flame temperature on the inhibition efficiency was investigated by varying the oxygen index of the flame supporting atmosphere. In addition a spectrographic investigation of powder - flame dissociation products was carried out on the methane /air /ABC (NH4H2PO4) flame. Dissociation products for this flame included PO, PH, NH, and Na. It is concluded that the main factor to be considered in the efficiency of the powder is the flame temperature. Purple K (KHCO3) was typically inefficient in low temperature flames and very efficient in high temperature flames. On the other hand, ABC . (NH4H2PO4) was found to lose its efficiency at high temperature but to be quite efficient! in the low temperature flames. The effect of temperature is offered as an explanation of the poor efficiency of,Purple K (KHCO3) against coal dust explosions as contrasted to the high efficiency of phosphate salts against coal dust explosions.
