Pump Control - Case Study

Application story /// Application story /// Application story /// Application story // Industry: Sewage and waste water treatment Products Used: Frequency inverter drives FACTORY AUTOMATION Inverters reduce operating and servicing costs Variable-speed drive solutions are now used in all branches of modern industry. The aha Zweckverband Abfallwirtschaft Region Hannover in Germany has also benefited from the many advantages of modern asynchronous three-phase AC motors powered by frequency inverter drives. The installation of FR-F 740 frequency inverter drive systems from Mitsubishi Electric has drastically reduced the operating and servicing costs at the association’s leachate water treatment plant, recouping the investment costs of around €70,000 in the space of just two years. The aha has been responsible for waste management in the Greater Hanover region since the beginning of 2003. It was established by merging the former separate organisations responsible for waste management in the Hanover city and sur- rounding region, the Abfallwirtschaftsbetrieb Hannover and the Abfallentsorgungsgesellschaft Region Hannover mbH. The new organisation is continuing the strong traditions of outstanding performance established by its predecessors. The around 1,500 employees of the aha Region Hannover are committed to sustai- nable environmental protection, economy and safe and efficient waste disposal. Twelve rotary piston pumps, each with a pumping capacity of 35 cubic metres per hour, are installed at the aha’s leachate sedi- mentation facility, where they operate round the clock, 365 days a year. The twelve pumps feed the water into the sludge separa- tion basins and remove the biologically-purified water from the facility. This is followed by the final treatment phase, in which the water is run through six activated charcoal filters that absorb compounds like COD and AOX that are otherwise difficult to break down. After this the pre-treated water is pumped to the communal sewage treatment plant in Hanover-Herrenhausen, where it is mixed with the household sewage prior to treatment. During the first months of operation aha Hanover did not use controlled drive systems to power the pumps at the leachate plant. All twelve rotary piston pumps were connected directly to the mains power supply. This meant that the pumps were sub- ject to extreme mechanical stresses, because when they were powered on the full mains voltage was applied immediately – controlled acceleration was not possible, and this naturally resul- ted in frequent damage to the bearings, and also seal problems, leaks in the pump housings and problems in the entire piping network of the pumping system. Every two to three months new bearings costing around €700 each had to be installed. In additi- on to this the rapid pressure rises on power-up caused frequent ruptures in the membranes of the ultra-filtration system. To counter these problems, twelve FR-F 740 frequency inverter drives with a total rated capacity of 66kW were installed by Fritsche Industrievertretungen GmbH, a Mitsubishi Electric Automation Network partner. The new drive systems are also connected to a Profibus DP network and a central process control system. Mitsubishi Electric Europe /// Factory Automation - European Business Group /// Gothaer Strasse 8 /// D-40880 Ratingen /// Germany Tel: (02102) 4860 /// Fax: (02102) 486112 /// Email: [email protected] /// Web: www.mitsubishi-automation.com Application story first released in February 2007 Now we haven’t only solved the mechanical problems, we have also improved the efficiency of the entire plant by between 4 and 5 percent.” Frank-Dieter Schulz Works manager aha “ ”

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CAso de estudio de control de bombas con VFD mitsubishi

Transcript of Pump Control - Case Study

Application story /// Application story /// Application story /// Application story //

Industry: Sewage and waste water treatmentProducts Used: Frequency inverter drives

FACTORY AUTOMATION

Inverters reduce operatingand servicing costs Variable-speed drive solutions are now used in all branches ofmodern industry. The aha Zweckverband AbfallwirtschaftRegion Hannover in Germany has also benefited from the manyadvantages of modern asynchronous three-phase AC motorspowered by frequency inverter drives. The installation of FR-F 740 frequency inverter drive systems from MitsubishiElectric has drastically reduced the operating and servicing costsat the association’s leachate water treatment plant, recoupingthe investment costs of around €70,000 in the space of just twoyears.

The aha has been responsible for waste management in theGreater Hanover region since the beginning of 2003. It wasestablished by merging the former separate organisationsresponsible for waste management in the Hanover city and sur-rounding region, the Abfallwirtschaftsbetrieb Hannover and theAbfallentsorgungsgesellschaft Region Hannover mbH. The neworganisation is continuing the strong traditions of outstandingperformance established by its predecessors. The around 1,500employees of the aha Region Hannover are committed to sustai-nable environmental protection, economy and safe and efficientwaste disposal.

Twelve rotary piston pumps, each with a pumping capacity of 35cubic metres per hour, are installed at the aha’s leachate sedi-mentation facility, where they operate round the clock, 365 daysa year. The twelve pumps feed the water into the sludge separa-tion basins and remove the biologically-purified water from thefacility. This is followed by the final treatment phase, in which thewater is run through six activated charcoal filters that absorbcompounds like COD and AOX that are otherwise difficult tobreak down. After this the pre-treated water is pumped to thecommunal sewage treatment plant in Hanover-Herrenhausen,where it is mixed with the household sewage prior to treatment.

During the first months of operation aha Hanover did not usecontrolled drive systems to power the pumps at the leachateplant. All twelve rotary piston pumps were connected directly tothe mains power supply. This meant that the pumps were sub-ject to extreme mechanical stresses, because when they werepowered on the full mains voltage was applied immediately –controlled acceleration was not possible, and this naturally resul-ted in frequent damage to the bearings, and also seal problems,leaks in the pump housings and problems in the entire pipingnetwork of the pumping system. Every two to three months newbearings costing around €700 each had to be installed. In additi-on to this the rapid pressure rises on power-up caused frequentruptures in the membranes of the ultra-filtration system. Tocounter these problems, twelve FR-F 740 frequency inverter dri-ves with a total rated capacity of 66kW were installed by FritscheIndustrievertretungen GmbH, a Mitsubishi Electric AutomationNetwork partner. The new drive systems are also connected to aProfibus DP network and a central process control system.

Mitsubishi Electric Europe /// Factory Automation - European Business Group /// Gothaer Strasse 8 /// D-40880 Ratingen /// GermanyTel: (02102) 4860 /// Fax: (02102) 486112 /// Email: [email protected] /// Web: www.mitsubishi-automation.com

Application story first released in February 2007

Now we haven’t only solved the mechanicalproblems, we have also improved the efficiencyof the entire plant by between 4 and 5 percent.”

Frank-Dieter SchulzWorks manager aha

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