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
    • Direct, fast in-situ measurement
    • No gas sampling, no gas transport, no gas conditioning
    • Up to eight measuring components at the same time, plus process temperature and pressure
    • DOAS and CDE evaluation process
    • Numerous independent measuring ranges with consistent accuracy
    • Automatic self-test function (QAL3) without test gases
    • Overpressure encapsulated design for ATEX Zones 1 and 2
    • 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