The riser duct itself has a gas residence time of approximately 3 sec, so up to 25% TSR at the riser duct is possible by limiting the material to a maximum of 50 mm. The SAF is now injected above the bypass take-off point. To limit the CO emissions, a hot ignition zone has been created in the SAF injection. This was realized by moving the existing meal inlets to the rser duct of about 8 – 10 m.
As the kiln is equipped with an extended kiln riser duct (without tertiary air), it is possible to fire a significant amount of fuel in the kiln riser duct. About 20% of the total fuel as SAF with main burner quality can be fired.
