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New I&C and control technology for sewage sludge incineration Munich North |
In the sewage sludge incineration of HKW (HeizKraftWerk = district heat and power station) Munich North block 3, sewage sludge from the sewage disposal plant Gut Grosslappen
is thickened by means of three centrifuges, dried in two impact crushers and then burned after being injected into the smoke gas stream of waste cylinders 31 and 32.
The sewage disposal plant Gut Grosslappen together with the sewage disposal plant Gut Marienhof, ensures the waste water and sewage disposal of approx. 1.5 million inhabitants
and treat 80 million m³ of wastewater and sewage anuallly. The accumulated sewage sludge is partly incinerated locally and partly in the HKW after de-gassing.
Comprehensive work on the
measurement and control technology
The extent of the work covered the partial replacement of the measurement technology (including supply of the sensor equipment), the renewal of the complete cabling
and a completely new central control level that was integrated into the existing PCS-7 system.
The existing power control cabinets were also replaced by a new ABB low voltage switching system in modular plug-in unit technology, during which around 100 motors and actuators were re-wired,
approx. 50 measurements replaced and 20 000m of power and data cable replaced and re-laid.
Critical time plan
The complete revamp and the cold commissioning of the plant had to be completed in 12 days, in order not to overfill the buffers in the waste disposal plant.
Adding to the difficulty, was that only very few of the cables could be installed beforehand and no equipment could be replaced as the plant was working up
to the last minute and the burning could not be compromised.
Successful start-up
The cold commissioning could be successfully completed within the pre-determined time, due to the excellent and frictionless co-operation with the plant.
The sewage sludge incineration could be resumed within 14 days after shut down. The complete revamp could therefore be completed to the full satisfaction of all parties concerned.
Especially the much improved handling and visualization makes the control of the plant by the central control room personnel much easier.
Due to the integration into PCS7 and the replacement of the sensor equipment the possibilities of efficient maintenance and fault finding are also vastly improved.
For more information please write to put@sar.biz
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