Description Of The Analyzer System; Application And Function Of The Analyzer System - ABB ACF5000 Manual

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Description of the analyzer system

Application and function of the analyzer system

Application
Function
Measuring principle
ACF5000 FTIR ANALYZER SYSTEM
The ACF5000 analyzer system is a multi-component analyzer system for
continuous measurement of the concentration of individual components in
the flue gas of industrial incinerators.
The field of application of this measuring equipment basically involves tasks
associated with emissions monitoring; use in process control applications,
however, is also possible.
The gas to be measured is drawn from the gas channel by means of a gas
sampling probe and conveyed to the analyzer cabinet via a heated sample
gas line. The sampling probe contains a particulate filter that removes dust
particles from the gas. As a standard feature, the analyzer system controller
offers the ability to connect the zero gas and test gas to the sampling probe
upstream of the filter element automatically. Automatic cleaning of the
sampling probe filter is available as an option.
The gas path from the sampling location to the analyzer is heated through-
out (180°C) to prevent the temperature from dropping below the dew point
or condensation of flue gas. The heating is controlled and monitored by the
system's electronics.
An optional heated measuring point selector can be configured for process
measurements.
Conveying of the sample to the analyzer is based on the injector principle
and employs an air jet injector that is integrated into the heated sample
handling block (ASP block). This, in turn, is connected directly to the heated
gas cell.
Test gases can be connected either automatically or manually to both the
gas sampling probe and directly to the analyzer.
The analyzer system operates on the principle of FTIR spectrometry. The
concentrations of a variety of stack gas components that exhibit absorption
bands in the mid-infrared range can be determined.
Each gas absorbs infrared radiation in a specific region of the spectrum. The
radiation absorbed at a given wavelength is a function of the gas concentra-
tion. The FTIR analyzer (spectrometer) measures how much radiation was
absorbed at specific wavelengths.
The information about the absorption processes is processed in the sys-
tem's electronics and converted into measured values. At the same time, the
spectra of all components are recorded.
A zirconium dioxide sensor for measurement of the oxygen content is an
integral part of the analyzer system.
| OI/ACF5000-EN REV. A