Cogeneration CHP, District Energy, Europe

MAN Energy CHP plant expected to halve CO2 emissions

A consortium of MAN Energy Solutions and general contractor MMEC Mannesmann is to build a combined heat and power plant which will boast the most powerful gas engines installed in Germany.

The plant in Jena will be constructed for TEAG Thüringer Energie (TEAG), which wants to expand an existing gas and combined cycle power plant at the same location.

The new plant is due to start operating in the 2021/22 heating period and is expected to significantly reduce emissions at the site.

MAN Energy said that the five 12.6 MW gas engines at the plant will have a total capacity of approximately 63 MW, making them the most powerful gas engines installed in Germany.

Thanks to two-stage turbocharging, the generator sets are also particularly efficient and the flexibility of the plant is further increased thanks to a heat storage with a capacity of around 600 MWh.

Engines with two-stage turbocharging come with a low-pressure compressor and a high-pressure compressor, which work connected in series and therefore achieve improved power density and efficiency.

The expansion to the power plant is part of a comprehensive modernization project with the objective of reducing the CO2 emissions of the Jena plant. TEAG is investing around €80m in the district heating site.

“The signed contract is also a climate protection pact since the expansion to the power plant reduces emissions of the greenhouse gas CO2 by almost half when compared with the current status,” said  TEAG board spokesman Stefan Reindl.

Hajo Hoops of the power plant division of MAN Energy Solutions, said: “With this CHP project, we are setting a new standard in the German market.”

“In Jena, we are not only installing the largest gas engines in Germany, but we are also achieving degrees of utilization beyond 90 per cent while, at the same time achieving a power-to-heat ratio greater than one. This translates into high efficiency both during heat extraction and also during electricity production.”

The deal with TEAG is the latest CHP success story for MAN Energy: in February, it commissioned a 30 MW plant at the Stuttgart Gaisburg site for EnBW; currently being commissioned is a plant for Stadtwerke Schwäbisch Hall, which also uses a 35/44G TS engine; and a 51 MW CHP plant for Frankfurt (Oder) municipal utilities is expected to be commissioned in the 2021/22 heating period.

“Gas engines have some very important advantages regarding the challenges we are facing in the light of the green energy transition,” said Hoops. “For example, exceptional flexibility for starts and stops, which helps to complement the fluctuating power generation from renewable energies. Our machines achieve full power in three minutes and can be switched on and off as required.

“This allows our customers to operate in a way that is operation- and market-oriented as well as extremely flexible. Combined with a heat storage, as is the case here in Jena, operators can respond to pricing signals on the electricity market with the power plant while guaranteeing a safe and highly efficient supply of heat at all times.”
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