Cel The use of an innovative, catalytically operative process to reduce NOx in exhaust gases from coal-fired steam boilers. The advantage of the DENOX unit is that it may be built on to existing plants, without major modification, thus saving time, money and avoiding shutdowns.The plant has operated in at load conditions according to the legal requirements and the suppliers quaranteed data. The NOx-emission is < 200 mg/m3, the NH3-slip< 0. 1 mg/m3. The pressure drop of the reactor is 9 mbar, of the total plant 24 mbar.The hot side temperature approach of the GAVO is lower than 30 deg. C. To compensate this temperature approach the consumption of natural gas is about 1400 m3/h at 100 % load.It takes around 7 hours to heat up the DENOX plant after a longer stoppage (cold start up). After a week-end shut down it lasts around 2. 5 - 3 hours and after a night-shut down 1 hour to set the plant into operation.First tests of the catalysts in a laboratory after a operation time of 3700 h showed no activity loss.This constract relates only to the fifth phase of the project ( completion of the plant, commissioning and demonstration).The demonstration plant is constructed at the Heilbronn Power Station and removes the nitrogen from exhaust gases in the units 3 -6. Rather than use the DENOX unit as it is used in Japan, between the boiler outflow and air preheater (prior to the electric precipitator and the desulphurisation unit) it is installed after the desulphyrisation unit. Dust is filtered out by electric as the end product. The nitrogen in exhaust gases is selectively reduced by catalysts, with the addition of ammonia to break down the NOx into nitrogen and water vapour.The exhaust gases emerging from desulphyurisation, at about 50 deg. C, are heated to required reaction temperature prior to passing into the DENOX-reactor.Since the process causes no major heat loss in the reactor, the heat content of the clean exhaust gases can largely be recovered before the gases are passed into the chimney, by using the gas preheater. In constant operation, the gases only have to be heated by the temperature difference corresponding to the hot side temperature approach of the heat exchanger system. For this task a natural gas burner is used. Before entry into the DENOX reactor, ammonia, in the firm of an air/ammonia mixture, is added to the exhaust gas in proportion to the quantity on NOx contained. In the reactor, nitrogen oxide is reduced, producing water vapour and N2 as end products. After passing through the DENOX reactor, the exhaust gases are passed through the heat recovery system and cooled to the chimney temperature before being passed through and removed. Program(-y) ENG-ENDEMO C - Programme (EEC) of demonstration projects and industrial pilot projects (EEC) in the energy field, 1985-1989 Temat(-y) 8.7 - FLUE GAS CLEANING Zaproszenie do składania wniosków Data not available System finansowania DEM - Demonstration contracts Koordynator ENERGIE-VERSORGUNG SCHWABEN AG (EVS) Wkład UE Brak danych Adres KRIEGSBERGSTRASSE 32 POSTFACH 158 7000 Stuttgart Niemcy Zobacz na mapie Koszt całkowity Brak danych
