In case of selective non-catalytic reduction (SNCR), ammonia reacts with the harmful nitrogen monoxide (NO) and nitrogen dioxide (NO2) from the flue gas into harmless nitrogen (N2) and water. The reaction temperature is 850 to 1,100 °C.
In practice, urea-based ammonia-releasing reduction agents, such as the proven carbamin 5722 from ERC Technik, are the most suitable option available. The SNCR plants of ERC Technik essentially consist of the storage facility for the reductive agent, a metering unit and the atomisation equipment. The reductive agent is distributed in an aqueous solution into the flue gas Prior to the reaction chamber. The injection system is individually designed, thus, reaction always takes place in the correct temperature range.