<4. Applications>
4-5
TI 11M12A01-01E
Mar. 14, 2017-00All Right Reserved Copyright © 2004, Yokogawa Electric Corporation
4.2 Iron and Steel Furnaces
(1) Iron & steel heating furnace
These furnaces are for the heating of steel slabs, and generally the measured gas is at a high
temperature of 1000°C or above. The oxygen concentration is controlled to a low level to prevent
oxidation of the slabs. These are also some cases in which there is some amount of CO in the
gas, and in which magnetic oxygen analyzers or infrared type CO analyzers are used.
Sample point System type Detector Objective
Preheat zone, heating zone,
soaking zone
H2, H3 D5 Combustion monitoring
FCV
FCV
PCV Throttle Valve
PCV
N
2
N
2
M M
B
DF
GL
FCV
Thinning-out
Valve
Hot Air Emission
To Each Zone
To Each
Zone
Shutoff Valve
To Burner
Fuel
(Mixed
Gas)
Stack
Furnace Pressure Damper
Charging
Machine
Charging
Door
Preheat
Zone
Heating
Zone
Soaking
Zone
Slabs
Discharge Door
Hydraulic Pressure
Extractor
Induced Draft Fan
Suction Damper
Blower
Delivery Damper
Recuperator
Walking Beam Skid
F0405.ai
Iron & steel heating furnace
Gas temperature: 900 to 1400°C
Gas pressure: 0.03 to 0.05 kPa
Dust: Minute
Fuel: Gas
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