APPLICATION NOTE
Measurement of O2 Concentrations in Recovery Flue Gas from
Converter Furnace by the TDLS200
Industry: Iron and Steel
Product: TDLS
Introduction
Expected Benefits
O2 measurement is used to safely recover flue gas containing
a high concentration of CO from a converter furnace. With
conventional paramagnetic oxygen analyzers, O2 concentrations
are obtained through a sampling system to recovery flue gas.
Therefore, there are problems with the maintenance and running
costs of the sampling system, and time delays in measurement.
The TDLS200 Laser Analyzer is the solution to all these
problems.
– Eliminates the need for sampling and reduces the maintenance
and running costs of the sampling system
– High-speed response, ability to apply measurement results
to control the O2 concentrations, improves gas recovery rate,
and reduces fuel costs through the reuse of the recovered gas
– Continuous monitoring and highly accurate O2 concentration
monitoring
Process Overview
An oxygen converter gas recovery (OG) system is a treatment system to safely recover flue gas containing a high concentration of CO
from a converter furnace. Since the recovered flue gas is reused as fuel, a slow response time results in a waste of fuel resources. That
is why high-speed response and high reliability are required for O2 measurements.
View of an installed TDLS200
(Installation Example A)
Example of Iron and Steel Converter
Furnace Process (Block Diagram)
: TDLS installation
Upper safety valve
Oxygen
CO/CO2
Stack
Primary dust collector
Lance
nozzle
CO
Radiation
section
Hood
Water seal
chamber
Secondary
dust collector
Silencer
Lower
safety valve
Water seal
chamber
Three-way
valve
Gas
holder
Silencer
Converter
furnace
IDF
Bypass valve
Water seal
chamber
O2 Installation example A
• View of installed light emitter
• Light path length: 2.4 meters
• Temperature correction: 55°C
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AN 10Y02F01-01E
All Rights Reserved, Copyright © 2011, Yokogawa Electric Corporation
APPLICATION NOTE
Solution Details
The point is to use the TDLS200 capable of directly measuring the O2 concentrations after IDF, instead of conventional paramagnetic
oxygen analyzers that perform measurements through a sampling system. The high-speed response and high accuracy of the TDLS
for the converter furnace process enable high purity gas to be recovered with higher efficiency.
Field Data
Converter Furnace Process and Changes in Measured Values of O2 Concentration (Installation Example A)
The recovered gas rises to the reference value
of 1.0% about 1 minute faster than with a
conventional paramagnetic oxygen analyzer.
If the reference value of the recovered gas is 1.0%,
the indicated value is shown about 3 minutes faster
than with a conventional paramagnetic O2 analyzer.
O2 %
2
TDLS analyzer
Conventional paramagnetic oxygen
analyzer for converter furnace
1
0
3
6
9
12
15
18
Time (min.)
(Blowing time)
Measurement System
TDLS (O2 analyzer)
Notes
TDLS200-G-X1-2-N/PS/W
• Power supply: 100 - 240 VAC, 50/60 Hz
Note: E
nter a number from 0 to 9 in  for the light emitter/light
receiver cable length (in meters).
• Purge gas: N2
Alignment flange
• Dust concentration (standard): 15 g/Nm3 or less
P/N K9745CA (ANSI Class 150 2-inch, 316SS)
• An insertion tube (custom order) is used
Flowrate: 5 L/min to 50 L/min
Insertion tube (custom order)
Alignment flange 316SS
(SUS316 equivalent)
Process
Light
emitter
50A full
port valve
To universal remote
power supply
Light
receiver
Laser light
ANSI Class 150 2RF
flange
Light emitter/light receiver connection cable
Light emitter/universal remote power supply connection cable
Universal remote power supply (/URD)
Small indicator
To light receiver
90 to 240 VAC power supply
(supplied by customer)
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AN 10Y02F01-01E
All Rights Reserved, Copyright © 2010, Yokogawa Electric Corporation
1st Ed: Feb.2011 (YK)
To light
emitter