Stage-controlled heating system with self recuperative burner

Self recuperative burners feature an integrated
heat exchanger (recuperator) to preheat the
combustion air. Flue gas and combustion air are
fed through a heat exchanger in the opposite
direction. Depending on the burner model and
mode of operation, 30 % energy savings can
be achieved with air preheating up to 700 °C in
comparison to cold air burners.
Self recuperative burners are used for direct
heating in conjunction with an eductor for extracting
the flue gases from the furnace chamber.
The eductor generates a vacuum with a centrally
positioned nozzle and thus draws approx. 90 %
of the flue gases out of the furnace chamber
along the outside of the burner’s heat exchanger.
The remaining quantity of flue gas air is discharged
from the furnace via an additional flue gas
opening and in this process is also used for furnace
pressure control.
Self recuperative burners are controlled by a rotary
impulse system in staged ON/OFF control
mode. A variable gas/air ratio control is used
to control the gas/air ratio. Alternatively, the air
flow can be monitored by a pressure switch.