Fully automatic throughput and performance control
HUBER develops a revolutionary control system for BT Belt Dryers: The system is able to adjust the plant throughput fully automatically to varying dry substance contents in the dewatered sewage sludge. Operator attendance is thus reduced to a minimum.
Dewatered sewage sludge, even if coming from a sewage treatment plant, does usually not show constant properties. Variations in organic content, chemical composition or polymer necessarily lead to varying dewatering results. Minor variations can normally be balanced quite well, but variations greater than +/– 1% DR per hour may impair the drying process. Throughput performance will decrease or the required degree of drying may not be achieved. The plant operates less efficiently and operating costs increase.
The gap between costs and efficiency will increase even more if also larger amounts of external sludge are fed to the plant. Jumps from several percentage points DR per hour are frequently unavoidable as the sludges are in most cases stored in a large bunker and fed to the dryer as an undefined mixture. Under these circumstances, it is a great challenge for the plant operators to run the plant at full capacity. With an increasing number of different sludge sources it is becoming virtually impossible to achieve a homogenisation of the sludges with justifiable operator attention and personnel expenses.