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In order to meet the increasingly stringent requirements for air pollution control, the SCR and SNCR process, among other things, was developed for the denitrification of exhaust gases. A reducing agent is purposefully introduced into the hot exhaust gas stream via injection lances or nozzles, thus causing a selective NO reduction.

SCR procedure = selective catalytic reduction

The reducing agent is sprayed in temperature ranges of 200°C to approx. 500°C. If the reducing agent has been poorly pre-distributed, one or several static mixers are set up before it enters the catalyst housing.

SNCR procedure = selective non-catalytic reduction

In practice, the temperature window is between 850 and 1100°C.