Safety for CLASSIC Coal Mill Systems  

by means of constructional explosion protection e.g. for grinding systems for coal, lignite, petcoke.
TV's Vent 1+2 deflagration progagation de- coupling- and diversion concept uses self re-closing, re-usable explosion doors. The re-closing feature avoids ingress of atmospheric air with fire supporting oxygen and chimney effect. The explosion doors are positioned as to inhibit fast deflagration progation.

 
Conventional deflagration propagation de-coupling with a single, non-self-re-closing explosion diverter at the inlet of the filter is often found in systems with a long duct between mill and filter.
Due to the gain in velocity of the flame (and the pressure shock) non-self-re-closing explosion diverters had to be used. These, albeit equipped with low-mass covers, could still be damaged, with their disintegration parts tuning into missiles.
The resulting open connection with the atmosphere, allowing ingress of oxygen and / or loss of padding gas, can support a violent secondary explosion and will be hamper fire fighting.