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Clean and efficient: Stadtwerke Pirna gets a new CHP plant

3/11/2014 | Words: Silke Rockenstein | Pictures: Rolls-Royce Power Systems AG

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The local public utility in Pirna, near Dresden, recently expanded its energy supply capacity with the addition of a new combined heat and power plant (CHP) driven by a gas engine from MTU Onsite Energy. The reason for installing the CHP plant is to increase the generating capacity and the energy efficiency of the existing thermal power plant. “In addition to providing district heating, we will now be able to generate some of the electricity we need right here. This means that we will gradually have control of the energy supply ourselves, which will make us less dependent on the general energy market and enable us to respond more flexibly to the specific circumstances here in Pirna,“ said Olaf Schwarze, Managing director of the Stadtwerke Pirna at the commissioning ceremony.

The MTU gas engine installed in the CHP plant drives a generator, which produces electric power. At the same time, a heat exchanger removes the heat from the engine coolant and the exhaust gases. This ensures optimum use of the primary energy source, natural gas. As a result, the new combined heat and power plant achieves an efficiency level of some 90%. Compared with conventional plants, the CO2 emissions can thus be reduced by as much as 30%. The CHP plant delivers a thermal output of 2,152 kW and an electrical output of 1,999 kW. The electricity is fed into the Pirna energy supply grid, while the heat is fed into the district heating network. The entire capacity of the thermal power plant operated by Stadtwerke Pirna is used to supply around 4,500 households, 36 public buildings and 13 commercial enterprises with district heating.

AGO AG from Kulmbach was commissioned by Stadtwerke Pirna to install the combined heat and power plant and MTU Onsite Energy GmbH supplied the AoE 20V 4000 L33 genset.

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