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1. Drying of the furnace
The new built furnace or the furnace that haven't been used
for a long time should be dried before use. The drying
temperature generally is 100-200?. The element that has
been used for a long period time under low temperature will
cause low-temperature oxidation. For the small-sized
furnace, as its drying time is short, several hours will
little affect the element, but for the large-sized one, as
its drying is long, it should be dried carefully. Better
open the furnace gate so as to make it ventilated. The gate
may be half-opened with the rising of temperature and fully
closed when the temperature rises above 1000?.
2. Starting of the furnace
If the furnace has been dried or needn't to be dried, then
it may be started to raise temperature. In order to avoid
that it is impacted by over current and the electric device
is overloaded, the following steps should be adapted:
1). Small furnace (power<100KW): Furnace temperature
20~150? - 1/3 working voltage; Furnace temperature
150~500? - 2/3 working voltage; Furnace temperature 500?~
working temperature - full working voltage.
2) Big furnace (power 100~500KW): Furnace temperature
20~300? - 1/3 working voltage; Furnace temperature
300~700? - 2/3 working voltage; Furnace temperature 700?~
working temperature - full working voltage.
It shouldn't take a period of time to shift. Generally the
element temperature shouldn't be lower than 300~400? while
the element is being shifted, or it will easily lead to
current impact and damage the electric device.
3. Replacing of element
If it is found that one element is damaged during
operating, first, determine where it is, at the same time
prepare a made up one. Then loosen the thread which links
the lead wire of the damaged element and the bus, clear out
the ceramic cotton and pull out the through-brick.
Afterward, insert the new element from the furnace top,
link the lead wire, block the gap with ceramic cotton and
start raising temperature.
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