Practical Combustion Methods Used in Industries - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 221

controlling pressure
inside the furnace

controlling oxygen
in the waste gas

controlling temperature
inside the furnace

controlling
combustion

PIC O 2 IC TIC FIC Fr FIC

controlling diffusion
of the hot air

cross limit controlling

TIC

fuel

hot
air
diffusion

A A A

G G G

upper part of the preheating zone upper part of the heating zone upper part of the soaking zone

damper for the
furnace pressure lower part of the preheating zone lower part of the heating zone lower part of the soaking zone

recuperator

A G A G A G

dilution fan

suction
damper combustion

blower

M

controlling pressure of
the original combusting air

TIC

VVVF controlling
apparatus

PIC controlling dilution safety circuit

for combustion

controlling thinning
of the burner

FIGURE 4.2 An example of conventional instrumentation for heating furnace.