Radiant Tubes Combustion Systems
Radiant tubes are used for applications where the material is in contact with a controlled atmosphere in order to obtain the required heat treatment.
TRK and TRKS are installed respectively in radiant tubes without and with recirculation. The first are combined with an integrated recuperator, which is mounted on the cold leg of the radiant tube while the latter are of self-recuperative type.
Overview
TRK burners are combined with a counter-current heat exchanger which allows to recover heat from the waste gases coming out of the radiant tube. The design of the finned elements and the length of 500 - 600 mm allows for high-efficiency heat recovery.
In order to keep NOx emissions to a minimum, the recuperator is equipped with an internal ejection system which allows part of the fumes to be recirculated inside the combustion air. This design targets to reduce the oxygen content in the air in order to equalize the heat flow distribution along the radiant tube surface. The TRK combustion systems have been developed for U- and W-shaped radiant tubes (non-recirculating radiant tube designs).
TRKS and TRKSX burners are the flame and flameless versions of self-recuperative burners. Thanks to coupled gas and air staging, NOx emissions of the flame versions are always below 200 mg/Nm3 while for flameless version, NOx are further reduced to 80 mg/Nm3.
The high efficiency of the integrated heat exchanger allows to preheat the combustion air at high temperature for reducing the fuel consumption with respect cold air burners.
TRKS and TRKSX burners are suitable for recirculating radiant tubes types (SER, P or 2P). TRKS can be realized in specialty materials for high temperature applications of SER radiant tubes.
