Spark extinguishing systems are mostly used in industries where, for whatever reason, sparks could cause a fire:
- wood industries (furniture factories, timber processing, transport of sawdust and wood dust…),
- food industries (sugar factories, mills, driers, silos, coffee processing …),
- paper industries,
- storage facilities and transport of coal and carbon dust,
- exhaust systems,
- production of fertilizers,
- recycling plants.
Spark detection and extinguishing is used on pneumatic transport channels and suction pipe systems for organic substances, where there exists a risk of the spark being transported to the storage area where it could cause an explosion. The system is used to detect sparks and moving smouldering material. The detector sensor reacts to IR radiation emitted by the spark. The detector is mounted on the outer side of the pipeline and protrudes into the interior through a drilled hole. It may also be installed above conveyor belts transporting wooden material, cereals or food products. During installation make sure that it is not exposed to direct sunlight, as this may interfere with its operation (IR light spectrum). The detector is usually used together with an extinguishing system in control of the electro valve and the water nozzles, which use a brief shower to extinguish any spark that passes the detector.
An independent spark extinguishing system is made up of a spark detector, a central control panel and a stable set for fire extinguishing. One of the options is to use a fire extinguishing device which connects to the water supply and increases the water pressure. In cases where detectors control automatic fire extinguishing devices, the distance between the detector and the extinguisher nozzle must be larger than:
(transport speed x system reaction time x 1.5), so that the extinguishing medium is pumped into the piping before the spark reaches the extinguisher nozzle. The reaction time of the system is the sum of the reaction times of the detector (2 ms), the processing time required by the central control panel, and the electro-magnetic valve.
In certain applications an additional detector may be used, notifying eventual non-extinguished sparks or errors on the primary extinguishing system.
The main characteristics of the Zarja Elektronika IRJ 10 detector are:
- professional design, great reliability,
- high sensitivity adjustable in three levels,
- very short reaction time,
- produced in collaboration with the Jožef Stefan Institute in Ljubljana.