Operation of an SCR denitrification system (selective catalytic reduction)

Selective catalytic reduction removes nitrogen oxides (NO) from flue gases with the aid of a catalyst and injection of aqueous ammonia. NO is converted into water and nitrogen at 200 to 400 °C. At the catalyst inlet, the NO concentration can be measured in order to regulate the quantity of ammonia. At the catalyst outlet, NO and NH3 are measured. The NH3 concentration, in connection with the NO concentration, determines the efficiency of the denitrification process. The GM700 continuously measures what is called "NH3 slip" in-situ. In the case of emissions measurement at the stack, NOx and NH3 are recorded to check for compliance with legal thresholds.

  • Following product families can be used
    GM32
    GM32
    • Direct, fast in-situ measurement
    • No gas sampling, no gas transport, no gas conditioning
    • Up to four measurands at the same time, plus process temperature and pressure
    • DOAS evaluation methods
    • Numerous independent measuring ranges with consistent accuracy
    • Automated self-test function (QAL3) without test gases
    • Overpressure encapsulated type for Ex-zone 2
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    GM700
    GM700
    Efficient process analysis – even under difficult conditions
    • High selectivity due to high spectral resolution
    • Short response times
    • No calibration required
    • No moving parts: minimal wear and tear
    • No gas sampling or conditioning required
    • Overpressure encapsulated design for ATEX Zone 2
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