Environmental Engineering Reference
In-Depth Information
Comparison of Performance between Reheating Furnaces
High Performance
Reheating Furnace
Conventional
Reheating Furnace
Item
1.
Heating capacity, ton/h
285
285
2.
Slab dimensions
Thickness, mm
255
255
Width, mm
960
960
Length, mm
9,016
9,016
3.
Charging temperature, ˚C
20
20
4.
Discharging temperature
Lowest average temperature in the
direction of thickness, ˚C
1,200
1,200
Cross-sectional average, ˚C
1,220
1,255
5.
Furnace dimensions
Effective furnace length, mm
30,000
38,000
In-furnace width, mm
10,000
10,000
Furnace height
Upper zone, mm
1,800
2,400
Lower zone, mm
2,000
2,200
Furnace bed load, kg/m
2
/h
1,054
832
6.
Refractory material arrangement
Ceiling
Ceramic fiber
Amorphous refractory,
fiber
Walls
Ceramic fiber
Amorphous refractory,
brick, etc.
Skid
Plastic refractory + CF
(50 mm) + (30 mm)
Plastic refractory + CF
(50 mm) + (20 mm)
7.
Number of combustion control zones
6
6
8.
Furnace set temperature
Preheating zone, ˚C
1,300
1,300
Heating zone, ˚C
1,380
1,380
Soaking zone, ˚C
1,330
1,330
9.
Combustion air temperature (before
burners), ˚C
1,150-1,230 (Furnace
average: 1,175)
450
10.
Air ratio
1.05
1.2
11.
Unit fuel consumption
× 10
3
kcal/ton
240
345
GJ/ton
1.00
1.44
12.
Discharging temperature deviation
(skid mark), ˚C
32
65
13.
NO
x
value
Below the regulation
level
Below the regulation
level
14.
Heating time, h
1.8
2.3
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