FULLY-AUTOMATIC LIME DRY-SLAKING PLANT

A fully automatic lime dry-slaking plant has been in operation since J anuary 1998 in the Czech thermal power station at Pilsen as an importa nt component of a new flue gas cleaning system. This plant produces dr y, pourable, hydrated lime from burnt lime at a rate of 3.2 t/h in 24- hour operation. The water addition is controlled continuously through two water inlets as a function of the quantity of burnt lime used and of the temperature in the main slaking trough. This achieves a uniform residual moisture content of between 0.3 and 1.5% and enables the tem perature in the main slaking trough to be kept constant at 105 degrees C. Michael Glatt Maschinenbau GmbH has developed its own software for the fully automatic control system which incorporates the many years of experience of a lime plant operator. Even the differing slaking cha racteristics of different grades of lime, for example, were integrated into the design and programming of the control system. The advantages of the plant are that it works significantly more profitably than com parable, manually controlled, plants and provides hydrated lime of con sistently high quality. The plant only requires supervision for two to three hours per day so the operating costs have also been greatly red uced. The plant can be made for throughputs of between 1.5 and 15 t/h, and is therefore available for many applications, e. g. in lime works or for flue gas cleaning.