Backfire Detection

Spark detection technology for backfire detection of boilers

A backfire is an event where ignition sources can transmit from the fire box into the fuel transmission system and sometimes all the way into the fuel depot. The traditional way to prevent backfires is to use a thermo operated water valve (AVTA).

Atexon® optic backfire detectors by IEP Technologies offer superior detection speed and sensitivity compared with heat-responsive extinguishing systems.

Faster and more sensitive backfire detection with optical spark detection technology

A fire box that does not burn properly causes vapors and flames to appear in the fire box. This increases the probability of burning material and sparks to entering the screw feed and which can pass heat sensors undetected. With fast millisecond response times and high sensitivity, Atexon backfire detectors are much more reliable and trigger the extinguishing system which uses only a small amount of water due to the optimised nozzles design and placement.

Optional features include a GSM alarm, a pulse cooling feature, a screw control feature and a screw heat monitoring feature.

Operating principle of the backfire detector

1. The backfire detector is mounted on a screw or a release point between two screws.
2. The extinguisher unit is mounted approx. 0.5 meters away from the backfire detector.
3. The screw control output of the backfire guard is attached to the boiler’s automation system
4. The backfire guard has a 230Vac power supply
5. Depending on the application, a water pressure booster or a water tank is installed
6. The temperature sensors of the backfire protection system are mounted 0.5-1 meters away from the combustion head.

The backfire detection triggers the water extinguishing sequence that typically last for 10 seconds after the last detected spark. The extinguishing sequence will stop automatically. The temperature sensors measure the temperature of the combustion head and control the extinguishing unit with pulses if the temperature rises above 75C/165F. At 95C/200F, continuous extinguishing is triggered. The extinguishing sequence will stop when the temperature drops below 75C/165F.

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