The German Federal Minister for Environment, Nature Protection and Reactor Safety (BMU) and the State Ministry for Environmental Affairs in Hannover sponsor projects in shop-floor size which demonstrate how equipment can be adopted to the latest technical developments to reduce environmental damages. At PLM Glashutte Munder such a project is being sponsored and expertly accompanied by the German Federal Bureau for Environment with funds being made available by the BMU and the State of Lower Saxony. An important feature of the project is the technology to reduce NO, values with the help of the Selective Catalytic Reduction (SCR) process. The DeNOx facility has been equipped with two ammonia water storage tanks having a capacity of 30 m(3) each. The direct vaporizer is installed before the SCR reactor. The ammonia water is finely sprayed in with the two-material nozzle technique and mixed evenly with the flue gas volume flow. An analysis measuring device before and after the SCR reactor measures the relevant NOx values, these values are transformed into a signal which controls a valve supplying the required quantity of ammonia water. The conditioned flue gas volume is sent to the SCR reactor via guide systems. The reactor is equipped with two layers of catalyzers. To avoid bridge formation of dust that still accumulates in the purified gas flow dust blowers are positioned above each catalyzer layer, which are activated at set intervals. First practical results show that with this technology NO, emissions can be reduced to values below 500 mg/m(3) flue gas, where the NOx concentrations are based on dry flue gas in standard condition (1013 mbar, 273 K) with 8% O-2.
