How Machine Extinguishing Systems prevent fires
Industries such as woodworking, recycling, biomass, and pellet production use spark detection systems as the most effective means of preventing fires in dust extraction filters.
Sensitive detectors combined with high speed extinguishing units prevent ignition sources passing through the dust extraction ducts and so prevent fires starting downstream; the protection is straightforward and well proven.
In addition to preventing fires in the dust extraction filter, a spark detection system can provide the basis to protect other machinery in the plant.

Extending fire protection into production machinery
When a fire is starting inside a machine (eg a planer / moulder in a woodworking application, a shredder in a recycling or biomass application or a grinding mill or dryer in a pellet plant) the first indication of that fire will be from the spark detection system. As a fire starts, the spark detectors begin to see embers and hot particles in the dust extraction ducts and burning dust in the outfeed conveyors.
The spark detection system prevents those embers reaching the filter through the dust extraction ducts and prevents the fire spreading through the conveyors. In addition, before there is any significant fire or increase in temperature, the spark detection system can shut down the plant, alert operators and activate extinguishing sprays into the machine itself.
Where necessary, spark detectors in the extraction duct can be supplemented by ember detectors in the machinery or conveyors. Heat detectors or linear heat detection cable can be installed in motor compartments and flame detectors can view the overall area, resulting in a comprehensive fire detection system for the machine.
Water curtain extinguishers in the extraction duct prevent ignition sources and burning material reaching the filter. Additional water mist or gas extinguishing can be released into the machine where the sparks originated, to suppress flames and prevent the fire spreading.
