A multi-purpose test bench is designed and manufactured. In this project task 3.3, the target with the test bench is to test performance of SCR (selective catalytic reduction) system. In SCR system ammonia, or urea, is used to reduce NOx to elemental nitrogen. The criteria for the test bench was focused on the exhaust gas flow, SCR catalyst volume, temperature window, urea injection optimization, monitoring for SCR operation and control system for easy operation. The mass flow in the slip-stream test bench will be controlled and measured with a coriolis mass flow meter. Test catalysts will be easy to change and test bench has a possibility to test different catalyst volumes. Temperature window 250-400 ºC is targeted to cover with heating units placed around mixing tube. The urea injection is done in the beginning of the 2.5 m mixing tube and the injection place can vary. The urea nozzle was selected according to proper droplet size and injection amount. Several temperature, pressure and emission components measurement points are placed in the test bench. For easy operation of the test bench, an automation system to control, measure and save the needed parameters is done. This program is done with LabView. The test bench prototype is now ready and will be tested in August 2011.
|Publisher||CLEEN Cluster for Energy and Environment|
|Number of pages||14|
|Publication status||Published - 2011|
|MoE publication type||D4 Published development or research report or study|