Environmental Engineering Reference
In-Depth Information
TABLE 5.9
Heat Balance Table
Processing Volume
200 ton/h
Fuel Consumption
11.01 × 10 2 kJ/ton
Furnace Efficiency
72.7%
Heat Balance Total
Heat Volume
8.90 × 10 4
kW
18.63 × 10 2
kJ/ton
Ratio of Input Heat
%
MJ/ton
Ratio of Output Heat
%
MJ/ton
Sensible heat of charged
steel
1.1
16.87
Sensible heat of
discharged steel
51.0
816.62
Fuel combustion heat
68.7
1100.24
Heat loss by cooling air
6.3
100.68
Sensible heat of fuel air
30.3
485.01
Radiation heat from
furnace body
1.3
20.13
Scale forming heat
1.0
16.33
Heat loss of exhaust gas
41.5
664.68
100.0
1602.43
100.0
1602.43
Sensible heat of cool air
0.6
9.56
Sensible heat of exhaust
gas
11.8
189.22
1800
Heat recovery
40 %
60 %
80 %
1600
1400
1200
1000
800
10
20
30
40
50
60
Furnace length, m
FIGURE 5.39 Relationship between the furnace length and fuel consumption.
TABLE 5.10
Calculation Assumptions
Company
A
B
C
Furnace length, m
36.00
19.00
24.65
Furnace width, m
10.10
8.30
5.60
Reheating tonnage, ton/h
200
100
100
Discharging temperature, ˚C
1200
1050
1150
Steel thickness, mm
250
130φ
120
Steel width, mm
1950
120
Steel length, mm
9600
7700
5300
 
 
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