ENVIRONMENTALLY FRIENDLY LIME PRODUCTION AT RHEINISCHEN-KALKSTEINWERKE FLANDERSBACH WORKS

The lime production at Rheinischen Kalksteinwerke's Flandersbach works was fundamentally reorganized in the 70s in connection with the energ y crisis. Among other things, 12 coke shaft kilns were converted into 6 double-shaft kilns during this reorganization. The converted kilns o perate on the co-current, counter-current, regenerative principle (GGR ) and now provide a highly reactive soft-burnt lime with a low residua l CO2 content. Although the exhaust gases from the three GGR kilns con verted from the S30 coke shaft kilns could be discharged through a com mon chimney the GGR kilns converted from the S40 coke shaft kilns had to be connected to a wet dedusting system. Due to the use of pulverize d lignites the dust concentrations in the exhaust gas could no longer be made to comply with TA-Luft (German Clean Air Standards) under all operating conditions, so in recent years the wet dedusting system was replaced by a bag filter dedusting system. Because of the exhaust gas temperatures, which can fluctuate between 80 and 350 degrees C, a forc ed-air gas cooler had to be installed before the bag filter. A report is given of the detailed design of the filter and of the noise suppres sion measures taken.