EXPERIENCE WITH THE PYROEXPERT(R) KILN CO NTROL-SYSTEM AT THE LEIMEN CEMENT WORKS

The PYROEXPERT(R) optimization system was installed at the Leimen ceme nt works for controlling and optimizing Lepol kiln III. Its introducti on was based on a concept which builds on process instructions already in use, i.e. PYROEXPERT(R) and the production controllers use the sam e rules for managing the kiln. PYROEXPERT(R) reduced the NOx emissions by about 15% and the SO2 emissions by about 11%. The number of emissi on peaks based on half-hour average values was also reduced to about o ne third of the original figure. When the ''maximum clinker production '' strategy was selected the production throughput increased by 6% wit h unchanged fuel and power consumption. The amount of underburnt mater ial was also approximately halved. The proportion of time spent in aut omatic operation was higher than 90%. Because of the favourable result s the optimization system is also going to be installed during this ye ar on two kilns and a cement mill.