Environmental Engineering Reference
In-Depth Information
e. Cooling water: which source of water (industrial water, well water, city
water, others) is available and the temperature, capacity, and pressure
of water supply must be confirmed; with industrial water, the water
quality must be checked, because accidents due to corrosion may occur
f. Temperature curve: temperature curve must be carefully checked,
because of occasional errors during inspections
g. Others: fluctuation of current voltage, an emergency current supply,
atmosphere in furnace, control units of temperature, cranes, setting
place, accessory equipment, etc. must be confirmed. Also specify other
issues, if any.
Based on these specifics, a plan and the fundamental specifications can
be drawn up.
3. Fundamental plan of design, which is based on the following
considerations:
a. Countermeasures for energy saving: installation of preheating zone
(particularly in case of continuous furnace); heat recovery from trays
and heating materials; reduction of the accumulated heat in walls and
the radiation heat from walls by selection of insulated materials
b. Countermeasures for labor saving: installation of automatic charging
of materials, automatic oil feeding, etc.
c. Legal regulation: confirmation of regulation values of NO x , SO x , and
so on, which can vary according to location; noise regulation values:
select burners and blowers with low noise specifications
d. Furnace configuration: there exist various configurations according to
the type of continuous furnace; for a semibatch heat treatment furnace
for coiled wire, both heating and cooling are conducted in the same
chamber
e. Others: saving operating cost, countermeasures to product liability (PL)
regulation, maintenance, etc.
4. Deciding fundamental specifications
a. Deciding furnace width: adoption of the width of heating materials +
about 640 mm
b. Deciding furnace height:
1. See Figure 5.73 ; clearance between furnace ceiling and fan decided
as indicated by Figure 5.74
2. Dimension determined by reference to change of fan axis length
owing to heat and slackness of fan blades (about 200 mm)
3. In general about 290 mm but in some cases the length must be
greater because of the relation of the heat uniformity of the heating
materials and the angles between RT and the heating materials
4. The same as that of 3
5. The same as the diameter of RT
c. Deciding furnace length (in the case of continuous furnace):
1. Tray size (from sizes of heating materials)
2. Loading weight per tray
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