Environmental Engineering Reference
In-Depth Information
Test Result of Kerosene Oil Burner
NO
x
Value
(Converted to 12% O
2
)
ppm
Air
Temperature,
˚C
Furnace
Temperature,
˚C
Oil burner of concentrated collision
flame type (F1)
40-90
800
1060
Oil burner of distributed collision
flame type (F2)
20-40
m
3
5.
Volume of combustion gas generated:
V
c
= 13.5
/kg of fuel oil
6.
Percentage of CO
2
in the combustion gas:
F
CO2
= 11%
According to the above assumptions, the reduction of fuel oil consumption is
expressed as follows:
˙
R
=
03
.
r M
Q
H
f
=
31200
,
t year
fuel
Al
fuel
and the reduction of CO
2
gas is
R
=
1000
R
V F
M
22 4
.
CO
fuel
c
CO
CO
2
2
2
where
M
CO
2
= molecular weight of CO
2
= 44.
5.4.4.2
Size Reduction
In the case of an aluminum-melting furnace, the cold material charged inside rises
as high as 2 to 3 m, and a large space is required inside. But once it is melted,
the depth of the molten bath will be 40 to 60 cm, meaning the inner space required
for the furnace is large for the former but small for the latter, a consequence of
a batch furnace. Easier working conditions inside the furnace also have to be
considered. A larger door will improve the working efficiency of charging the
material, removing slag and cleaning the furnace interior, but a smaller door will
not only hinder ease of working but will also be a source of trouble by being
easily damaged.
In consideration of all these factors, it is necessary to achieve a reduction in the
size of a furnace so that the initial construction costs and the amount of heat loss
are reduced. One of the ways to realize this is to obtain an appropriate distance
between burners and aluminum material. The test results are shown below:
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