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 Model Number |
EDA type elements |
| Brand Name |
Songshan |
Reference data for the design of batch-type SiC heating
element electric furnace. *****
1. Heating power (KW) =weight of the object to be
heated (kg) specific heat of the object to be heated
temperature-raising speed max furnace temp. [total
heating time (hour) 860] (860 kcal=1KW).
Suppose: unit heat-loss is 740 kcal/M2ohour.***
2. Heat-loss (KW) = surface area of furnace chamber (M2)
740 860.
Suppose: furnace wall thickness 10cm and furnace
temperature 100 is a unit constant, then the heat
accumulation quantity on the furnace chamber is 635 kcal
per M2.***
3. Heat accumulation power (KW)={[(furnace wall
thickness cm 10cm) ? (max. furnace temperature 100)]
635} furnace chamber area M2( total heating time (hr)
860).***
4. 10.4 The total power needed (KW) is the sum of
the above three terms. Owning to the fact that the SiC
heating element protractedly operates under high
temperature, it gradually ages and its resistance value
increases, power decreases. In order to adjust it to the
power needed, the power of transformer should be larger
than 30~50% of the total power needed.***
5. Select SiC heating element dimensions according
to furnace sizes.***
6. After determining the max furnace temperature,
calculate the power (Kw) of a single SiC rod using the way
of multiplying the stipulated surface load of the Sic
heating element under said furnace temperature (find it out
from the above table) by the surface area of the heating
part of the SiC heating element (Find it out from the
product dimension.)***
7. Total power (Kw) needed single SiC heating
element power=the quantity of SiC heating element that
should be installed.***
8. Design the circuit diagram and determine the
resistance of the single SiC heating element.***
9. The distance between the heating part and the
furnace wall and the object to be heated:
Elements Dia 8mm - Min distance 25mm; Elements Dia 12mm -
Min distance 38mm;
Elements Dia 14mm - Min distance 44mm; Elements Dia 16mm -
Min distance 57mm; Elements Dia 20mm - Min distance 68mm;
Elements Dia 25mm - Min distance 79mm; Elements Dia 30mm -
Min distance 94mm.***
10. The diameter of the hole for heating element-
inserting on the furnace wall should be 1.5 times of that
of the heating element end to be installed. The space there
is filled with asbestos cord or aluminum silicate fibre
felt.***
11. The central distance between two heating element-
inserting holes should be 3-4 times of the diameter of the
heat-generating part of the heating element.
12. In order to keep the SiC heating element and the
lead wire well contacting, better wrap the Al-sprayed
heating element end with 2 to 3 layers of pure Al leaf.
Then mount the lead wire clamp.***
In order to save energy resources, for the thermal
insulation material applied to building furnace, better
select well insulated high quality light aluminum bricks
and proper quantity of aluminium silicate fibre felt or
bricks.*****
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