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E-I-Tec - Selective Catalytic Reduction Unit (SCR)
In general, there are two procedures available which can be implemented depending on flue gas conditions. Non-selective catalytic reduction processes are based on the injection of a reactive agent without using an activating catalytic converter.
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Selective catalytic reduction principles may on the one hand use the same reactive agent as mentioned before but here a catalytic converter to actively reduce NO and NO2 is needed.
Limitations of both systems are quite obvious as they are limited by the reduction rate and in addition to that SNCR cannot achieve the same high-level separation rates as SCR.