Analysis on the use stage of well furnace
Analysis on the use stage of well furnace
There are several stages in the operation of a well furnace:
Furnace installation, exhaust and temperature rise:
1, after the well
furnace to the temperature insulation 0.5~1h, make the temperature uniform, into
the parts, hanging parts should be more than 10mm gap, to ensure that the gas
unblocked.
2, the parts must be placed in the effective heating zone of the
furnace tank, the upper end should not exceed the exhaust pipe, the lower end
should keep a certain distance from the intake pipe, after installing the
furnace exhaust time is about 20~60min.
3. The sample should be placed in
three different positions: upper, middle and lower.
4, after the installation
of the furnace, should immediately send infiltration agent exhaust (ethanol
drops), when the temperature of the furnace to the specified temperature, in the
outlet of the exhaust gas, such as the flame does not point, should increase the
amount of infiltration agent or timely clean up the pipe pile.
5, the new
furnace and the new fixture should be pre-nitriding treatment for
3~5h.
Insulation stage:
1. Check whether the ammonia decomposition rate
and flow rate are normal at any time. When the furnace temperature meets the
requirements and the ammonia decomposition rate is unstable, adjust the flow
rate of ammonia gas, increase the flow rate, reduce the decomposition rate, and
increase the decomposition rate.
2. In some nitrification tanks, the ammonia
decomposition rate increases during long-term use. In order to stabilize the
ammonia decomposition rate, 800~960 C 2~4h denitrification treatment is required
after the furnace is shut down.
Furnace cooling:
Parts with high fatigue
strength requirements shall be oil-cooled and silver-gray parts shall be
required on the surface. Under the protection of ammonia or cracking gas, the
lifting tank shall be cooled to 200 C before opening the tank to retrieve the
workpiece.
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