Environmental Engineering Reference
In-Depth Information
Combustion Facility Capacity
High Performance
Reheating Furnace
Conventional
Reheating Furnace
Item
1.
Burner
Number of burners
56
60
Facility (combustion) capacity
kcal/h
79,200 × 10
3
118,000 × 10
3
MW
92.1
137.2
2.
Combustion air blower
Number of blowers
1
1
m
3
Air capacity,
/min
1,450
2,400
Discharge pressure, mmH
2
O
1,100
1,300
Discharge pressure, kPa
10.8
12.7
3.
Exhaust gas induced fan
Number of blowers
1
Air capacity m
3
/min (at 150˚C)
2,200
Discharge pressure, mmH
2
O
1,100
Discharge pressure, kPa
10.8
4.
Air heat exchanger
(Regenerative medium)
(Air recuperator)
Air temperature, ˚C
1,150-1,230
500
(Furnace average: 1,175)
Temperature efficiency %
92.0
61.5
h.
Interference between the current facility and regenerative (air and exhaust
gas) piping
i.
Installation space for newly employed induced draft fan
j.
Consumption of utilities after modification
5.4.2
B
ILLET
R
EHEATING
This specification relates to the experimental design of a billet-reheating furnace
that incorporates the results of the national High Performance Industrial Furnace
Development Project. The furnace is a six-zone walking beam reheating furnace.
The billets, delivered in fixed positions on the furnace side, are fed by a charge roller
from the furnace side into the furnace. The billets fed into the furnace are forwarded
one after another by the walking beam that maintains continuous rectangular move-
ment. The billets heated and soaked inside the furnace are then transferred to a
discharge roller to be continuously discharged through the side of the furnace as
demanded by the rolling process.
This is a reheating furnace that incorporates the results of the national High
Performance Industrial Furnace Development Project. With this furnace, energy
saving (over 30% reduction of CO
2
), facility reduction in size by over 20%, and low
NO
x
combustion conforming to the environmental regulation level are all realized.
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