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21. October 2021

Measurement Technology in Waste to Energy Plants

As a result of the amendment to the 17th BlmSchV and the TA Luft, tighter emission limits will apply in some cases from mid-2022. (See Table 1 and Table 2). This makes retrofitting or at least the verification of flue gas cleaning necessary at some waste to energy plants.


IEM offers measurement technology and evaluation of the current separation performance:

  • Hg species measurement in waste gas (if required also HCI, HBr)
  • Sampling of various material streams
  • Preparation of material balances and complete metrological support from a single source
  • Execution of controlled load tests of the separation plant (e.g. by addition of so-called Hg-bombs)
  • Recommendation of possibilities for emission reduction based on the data from a material balance, a load test and/or empirical values
  • Complete documentation of the results
Schematic of a Waste to Energy plant with marked sampling points. For the SCR catalysts, both installation locations are shown as a possibility.

At the marked points (Table 1, A-E) we offer regular sampling in the flue gas (also upstream and downstream of high-dust SCRs). More unusual measuring points or measuring programs can be realized on request. With a few exceptions, the samples are prepared and analyzed in our laboratory.

Measuring probe with sorbent traps for Hg species measurement according to method 30B
Abbildung 2: Messsonde mit Sorbent-Traps zur Hg-Speziesmessung nach Methode 30B.
Species-selective Hg high-temperature measurement at 400°C in areas with high dust concentration.
Abbildung 3: Speziesselektive Hg-Hochtemperaturmessung bei 400°C in Bereichen mit hoher Staubkonzentration.
Species-selective Hg high-temperature measurement at 400°C in areas with high dust concentration.
Abbildung 4: Parallele Messungen im Abgas nach Methode 30B.
Measurement of acidic gases (HCl, HBr) at 400°C.
Abbildung 5: Messung saurer Gase (HCl, HBr) bei 400°C.

Depending on the parameters to be determined, the parameters in the exhaust gas are measured using adsorber tubes based on the US reference method M30B or by using bubblers (see picture 5)


To determine a material balance, measurements are carried out on the input and the various output streams of the plant components in order to record the separation of conversion efficiency. This results in an evaluation of the individual plant components, and starting points for an efficient reduction of emissions can be determined and defined.


Furthermore, in the field of emission reduction, IEM offers complete packages including preparation, implementation and evaluation:

  • Addition of halides to the firing
  • Use of the AK entrained flow method
  • Addition of additives to wet scrubbers
  • Fixed bed catalysts (partial bypass)
  • Further abatement processes on request

For most of these reduction measures, our own equipment is available; waiting times or delays due to external procurement or commissioning are eliminated.



Benefit from a full-service solution for measurement, sampling, balance preparation, full metrological support, consulting and documentation!

Comparison of changes to the 17th BlmSchV, new limits as of 07/2021
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