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DKL Engineering, Inc.
Handbook of Sulphuric Acid Manufacturing
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Preface
Contents
Instrumentation - O2
Concentration
June
4, 2006
Introduction Installation Instruments |
Associated Links |
After the gas cleaning system, the SO2
concentration is unknown as well as the O2:SO2
ratio. Air dilution may be required to achieve the desired conversion in
the converter. On-line continuous measurement of SO2
and O2
may be required to control the amount of dilution air being added to the
process.
An instrument that draws a gas sample from the main
process stream is preferred over an in-line instrument because of the problem of
maintaining the instrument. If the instrument is in-line it often cannot
be removed during operation for maintenance, calibration or repair without a
complete plant shutdown.
At Westcoast and Noranda an in-line probe was used sampling directly in the
process gas stream. The rubber O-ring seal deteriorated and allowed
process gas to damage the electronics resulting in an instrument failure.
Manufacturer | Type | Range | Model No. | Remarks |
AMETEK | Zirconium Oxide Electrochemical Cell | 1 to 100% O2 | WDG-IVC | Sample drawn from
process stream and delivered to analyzer Aspirator Air: 10 to 20 SCF/h @ 15 to 100 psi Electrical: 700 VA (max) Sensor 360 VA (max) Controller Accuracy: ± 2% of measured value In-situ analyzers are not recommended because of the requirement for a complete shutdown in order to remove and maintain the probe. |