Helical gear units H3 flender motoriduttori H3-CH-12B

Flender/Flender Gear Units/Helical gear units H3

d in piping and reactors, no increased corrosion was determined on the plant components in contact with the activated charcoal during the period of the trial. 1 Duration: 0.0.8 - 3.0.8 0VQ2 Subject: Detection and prevention of pollutants during nitrogen oxide reduction in waste gases Research centre: MAN Technologie GmbH Dachauer Strasse 6,8 Munchen Government sponsorship: DM 1,4,1 0 Sponsorship ratio' 5% 1. Purpose of the project The reduction of air pollution by nitrogen oxides is, above all else, necessary for two reasons - Nitrogen oxides, along with sulphur oxides, contribute to acid deposition - Nitrogen oxides are involved, in connection with organic materials, in the formation of photooxidants, ozone, which are attributed considerable significance as causes of the new types of forest damage In order to reduce NO, emissions, the actual combustion process can be tackled via primary measures In cases where this cannot be adequately achieved, in coal firing plants and engines, secondary measures on the waste gas side are necessary The secondary measures are predominantly aimed at reducing the nitrogen oxide to nitrogen particularly elegant solution is offered by the Lambda= technology in passenger cars and stationary gas engines The reduction of NO (0 1 to 0 2 %) in the waste gas of coal firing plants and stationary auto-ignition engines is made considerably more difficult by the resence of- oxygen in the range of 2 to 1% The most serviceable solution to date is the SPR process - Selective catalytic reduction with ammonia The SCR process is relatively complex chemical process To date, there have been nosystem- atic investigations for determining secondary reactions which lead to the formation of pol- lutants during the SCR process, despite the fact that, in addition to the known danger of an NH, break-through and the formation of ammonium sulphate, uncertainty also exists concerning the level of N2 emissions , should also be cl