Consideration on the Explosion Limit of Coal Dust-Rock Dust Mixtures in the Low Concentration Region
Explosion characteristics of coal dust-rock dust mixture (Part III)
1983 Volume 99 Issue 1149 Pages 971-975
Details
1983 Volume 99 Issue 1149 Pages 971-975
A simple heat balance equation was used to obtain the relation under the explosion limit condition. However, equations consequently obtained (Eqs.(8) and (9)) for fuel lean and rich sides, respectively, do not include important parameters such as particle size of coal dust and rock dust, and volatile content. Then the conditions that Eq.(8) must satisfy were introduced.
These are:
1) when the coal dust concentration is the lower explosion limit coal dust concentration, the rock dust mixed for suppressing explosions must be zero, that isR= 0 atC=CL.
2) when the coal dust concentration is the apparent stoichiometric coal dust concentration, that is ca. 250 g/m3, the rock dust mixed for suppressing explosions must be the maximum, that is atC= Cst, R=Rm.
As a result Eqs.(14)-(17) were obtained. These equations were tested by comparing with the experimental data obtained by Ishihama and Cybulski, and a very good agreement was obtained as shown in Figs. 1 and 2, respectively. Eq.(18) can be used to estimate the lower explosion limit concentration of coal dust-rock dust mixture, in which the percentage of rock dust mixed isR.
