.

Starting the burner in flame operation...
© Nach Erdgas.report 1/03 VNG – Verbundnetz Gas

…and FLOX® operation
© Nach Erdgas.report 1/03 VNG – Verbundnetz Gas

Burner in flame operation...
© WS Wärmeprozesstechnik GmbH

…and in FLOX® operation
© WS Wärmeprozesstechnik GmbH
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How do FLOX burners work?

With FLOX burners, combustion gas and combustion air flow into the combustion chamber at a high flow rate and unmixed (fig. 2b). The main difference to conventional burners is the very intensive internal recirculation of the exhaust gases in the combustion chamber, and the mixing of these gases with the combustion air. This, and the delayed mixing of air and combustion gas, prevents a flame front from forming. With sufficiently high temperatures of at least around 800°C, the fuel oxidises throughout the entire volume of the combustion chamber. This causes very homogenous temperatures. The formation of thermal nitrogen oxide, which primarily takes place at the flame edge with its high peak temperatures, is prevented.

With the more uniform distribution of temperature, not only do the nitrogen oxide emissions decrease, but it is also possible to maintain a higher average combustion chamber temperature. With conventional burners, the combustion processes are usually monitored with UV instruments. In flameless operation, this is not possible. Instead, the temperature of the usable space is measured. If the threshold temperature is exceeded, ignition and complete combustion are ensured.

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