50
7.4.2.
Description
The hydrogen operation
system uses existing
furnace plumbing and an
additional
gas
flow
control
system
to
introduce hydrogen into
the furnace chamber.
The
hydrogen
is
introduced
into
the
furnace by allowing it to
permeate through the
porous ceramic fiber
insulation,
which
preheats the gas before it
enters the process area.
Entrance
and
exit
baffles, located at each
end of the furnace
chambers, generate an
inert gas curtain which
effectively
keeps
ambient
air
from
entering the furnace
chamber and mixing
with
the
hydrogen
atmosphere. Venturi
assisted exhaust stacks,
located in the entrance
baffle
or
in
both
entrance and exit baffles,
draw off the excess
hydrogen and direct it into a burner assembly. The excess hydrogen, which is
drawn through the exhaust stack, is directed into the burner where it is mixed
with ambient air and ignited with a hot wire Igniter.
Figure 7.4.2.1 H2 / Forming Gas Sequential Operation
N2 H2 FORMING
WARM UP
PROCESS START
PURGE TIME
COMBUSTIBLE GAS
FILL TIME
H2/FORMING GAS
SEQUENTIAL OPERATION
Summary of Contents for 2115150301
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