Assessment criteria of procetive zones against coal dust explosions

Author: K. Cybulski

In the paper the amended mining regulations on the assessment criteria of zones protecting against coal dust explosion were discussed.

The influence of basic factors neutralising coal dust on degree of its explosibility and the reasons for changing the basic concepts characterising coal dust explosion hazard were described.

The possibility of applying checking criterion of protecting zone performed by stone dusting was discussed.

The reasons for changing the W sub kz formula giving a free water content that preventscoal dust explosion propagation were shown.

Then an analysis of coal dust explosion hazard based on differences of results of minimum water content necessary to prevent coal dust explosion, estimated with use of the old and the new formula was performed.

The influence of the changes in mining regulations on safety in work in the area of coal dust explosion hazard was assessed.