ERC Technik combines the Advantages of the SNCR and SCR processes in the ERC-plus process.
The ERC-plus process is applied if strict requirements are made on the secondary ammonia emissions (NH3 slip brake) and if NOx reduction rates are required which cannot be achieved by the pure SNCR process. The ammonia slip arising from the SNCR stage is used in the catalytic secondary cleaning stage for further nitrogen oxide reduction. Therefore, it can be guaranteed that the NH3 secondary emission is safely kept below 5 mg/Nm³. The catalytic layer is integrated into the boiler in such a way that the reaction temperature over the load range of the combustion plant is 350 to 400 °C.