Explosibility of coal-dust

Explosion of coal dusts in mines is described in Vol 3 of Encycl, pp C358 C359 under "Coal Dust and Its Uses and "Coal Dust Explosion Hazards from Its Uses . 

At the turn of the nineteenth century, explosions occurred in Great Britain, in non-fiery mines, proving the possibility of an explosion of coal-dust without methane as an initiating agent. It was however insufficient to rouse the experts to action. 

Meanwhile, in 1906, a terrible coal-dust explosion occurred at Courriere in France, in which about 1100 men lost their lives. The mine at Courriere had no methane at all and was considered to be safe, but as it turned out, it contained coal which in dust form produced a very dangerous suspension. The vast extent of this disaster aroused public indignation. It became obvious that the explosion of coal-dust may extend over a large area under ground and that this is much more dangerous than the explosion of methane which is usually localized within a small area. 

The explosion of coal-dust is usually of a thermal character. It undergoes degasification under the influence of a high temperature to form coke grains. If such grains are found after an underground explosion it is proof that the explosion was due to coal-dust. 

Cybulski [51] found that there is a straight line relationship between the explosibility of coal-dust and the specific surface area of the dust. This may be expressed by the formula ... 

The explosiveness of coal dust as a function of the distribution of coal stone dusts)... 

Explosion of coal dust and/or firedamp see Coal mine explns and fires 3 C360—C367... 

Explosiveness of coal dust-methane-air mixts and effect of inert gases on the expln delimitation of methane-air mixts) X)W.L. 

Turning to the detonation of condensed EM we note that in this case the study of the equation of state of a dense gas in which repulsion of molecules is more important than their thermal motion turned out to be non-trivial (see the fundamental work by L. D. Landau and K. P. Stanyukovich).29 Water-filled EM were studied by Yu. B. Khariton.30 At present A. N. Dremin is developing ideas on the specific influence of a shock wave on the kinetics of reaction in an EM.31 For gas-dispersion systems the structure of detonation waves has become the subject of numerous studies related to explosions of coal dust husks in grain elevators, gas suspensions of dust in wood processing, etc.32,33 34 5 Works on gas suspensions have also been published abroad.36,37 In gas suspensions we may expect that the reaction rate is determined by diffusion and depends weakly on the temperature. 

Notes on testing the explosibility of coal dusts and a proposal to have an international test method. U. S. Bur. Mines Inf. Circ. 6878. 

Ibid 425 (1910) (Explosibility of coal dust) 6)J.J.Rutledge C.Hall, USBurMines Bull 10 (1912) (Use of permissible expls) 7)C. Hall et al, Ibid 15 (1912) (Investigation of expls used in coal mines) 8)Marshall 1 (1917), 44-47 2 (1917), 582-606 (Permitted expls) 8a)Colver (1918), 247 681 (Nauck-hoff s expls) 9)Barnett (1919), 117-42 (Safety coal mine expls) 10)E.Lemaire, AnnMines-Belg 23, 649(1922) (Sheathed expls) 10a)C. A.Taylor W.H.Rinkenbach, USBurMines Bull 219 (1923), 107-14 (The thermochemistry of expln) ll)H.Henkei, SS 22, 173 (1927)... 

Ibid 425 (1910) (Explosibility of coal dust) 6)J.J.Rutledge C.Hall, USBurMines Bull 10 (1912) (Use of permissible expls) 7)C. 

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