Emission measurements are differentiated into two types: continuous measurements and single measurements.
Continuous measurement involves meticulous recording of the values. For this purpose, a measuring station is installed immediately in front of the chimney, from where the collected values are transmitted to an emissions calculation computer via a data system. The computer calculates half-hourly and daily average values. These average values are transmitted to the responsible supervisory body by data line.
The 17th Directive of Germany's Federal Immission Control Act (17. BImSchV) defines exactly which limits the collected data may not exceed. In addition, the regulatory authority may prescribe an even lower limit value.
Continuous measurement mainly involves constantly checking the following components:
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| Dust | Carbon content | Acid flue gas components | | Carbon monoxide content | Nitrogen oxide compounds | Mercury | | Ammonia* | | |
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All heavy metal compounds, dioxins and furans are measured by means of single readings. These compounds are documented every two months in the first year after putting a plant into service and every year after that.
Combustion Parameter
Another important measurement value is the combustion parameter. This fulfils two functions: it ensures that the minimum temperature in the combustion chamber is at least 850°C at all times, and that the pollutants remain at this temperature for at least two seconds. This is important because dioxins and furans are only definitely destroyed under these conditions.
To guarantee this, the measuring equipment is calibrated by the Technical Inspection Agency (TÜV) after commissioning of the plant. The data are constantly recorded and stored in the emissions calculation computer and the control system from after this procedure. This safeguards a constant incineration temperature of over 850°C.
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Temperature | Moisture | Oxygen | Pressure | Volumetric flow rate |
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