INTRODUCTION
Page 8
© 2013 Greenwood Clean Energy, Inc All Rights Reserved V1.9
Air Flow through the Furnace
1.
Under-Fire Zone:
Under-fire air entering through the pinhole grate combined with heat drives the
rate of pyrolysis (the release of gases from the wood fuel).
2.
Combustion Zone:
750 lbs (340 kg) of refractory reflect energy back into combustion chamber
maintaining optimum combustion temperatures.
3.
Crossfire Zone:
Over-fire air is added following the separation of gases from the wood pile.
4.
Burn-Out Zone:
Combustion is completed in the burn-out zone where gas temperatures reach 2000
o
F (1100
o
C).
5.
Heat Transfer Zone:
Heat is transferred from the hot combustion gasses to the water-tube heat
exchanger in an isolated chamber. This is the only area where heat is transferred to water.
6.
Exhaust Zone:
Exhaust gases leave the boiler at temperatures of 200 – 450
o
F (93
o
C to 205
o
C)
depending on firing rate.
Side View of Air Flow through the Frontier CX
Summary of Contents for Frontier CX
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