Power / Fossil Power Plants

Niedermeier Bayern BHKW GmbH

Bavaria has the largest number of biogas plants in the whole of Germany. The eco-power share at the Haag power stations in Upper Bavaria is around 20 %, which is almost double the German national average. The farmers in this region have been converting renewable raw materials into gas from the mid-1990s and generating energy from maize, abattoir waste or liquid manure using on-farm combined thermal power stations. A waste product from the electricity generating process is heat. Using powerful plate heat exchangers this thermal energy can be put to use to heat nearby dwellings and production buildings.

Kelvion References Power Plant

Supply and demand on the world market drove prices spiralling upwards. Legislators reacted with an amendment to the EEG Act to increase the guaranteed price paid for the electricity to 21.67 cents per kW/electric. The aim of the law is to encourage that the electric and thermal energy in cogeneration leads to the best possible overall efficiency. A further 3 cents are paid for every sensibly used thermal kilowatt. The law is expected to come into force at the beginning of 2009. The geostructural reality in Upper Bavaria makes it almost impossible to efficiently use thermal energy. Isolated farms, and all around nothing but countryside. And this is why a large part of the heat was simply blown off as waste air. However the aim is to utilize the heat, for example by establishing local and district heating networks. And here lies the future of combined thermal power stations.
 

The farmer fills the maize via a hopper into the fermenter, a kind of enclosed liquid manure trough, where the mash decomposes under the influence of natural and highly sensitive bacterial strains. Methane gas is released during this process. This gas flows through a gas drier installed downstream of the fermenter, is desulphurized and finally ends up in the combustion chamber of a powerful MAN engine. "Our drive unit of choice" says Alexander Niedermeier. The engine cooling water heated to 85 C° is pumped in counterflow through the VT 10 CDH-10 plate heat exchanger from Kelvion. Cold industrial water flows in on the other side of the plate heat exchanger. As it flows through the plates the industrial water adopts the temperature and at the same time cools the process water. Heated in this way, the industrial water flows back into the heating water circuit. The heat exchanger surface area of the 59 plates is 6.56 m2 and generates a heat output of 185 kW. This heat exchanging process is absolutely necessary to cool the engine constantly. If the heat is not dissipated, the unit would overheat and be destroyed. Farmer Anton Obermeier, whose family has been one of the biogas pioneers since 1995, operates a 125 kW plant from "Bayern BHKW" at his farm. 100 % of the electricity is fed into the public grid, and the farmer takes back 15 to 20 kW "to meet the demand for the whole farm complex", says Mr. Obermeier. He can only use 30 percent of the heat to keep the house and the farm at a cosy temperature and to keep the fermenter at a constant 40 C°, the ideal temperature for the fermentation process. Mr. Obermeier's upgraded system has been running without any problems since the end of 2006. In this period 1,277,055 kW of electricity were generated by the unit.

Kelvion References Power BHKW
Kelvion References Power BHKW

Supply and demand on the world market drove prices spiralling upwards. Legislators reacted with an amendment to the EEG Act to increase the guaranteed price paid for the electricity to 21.67 cents per kW/electric. The aim of the law is to encourage that the electric and thermal energy in cogeneration leads to the best possible overall efficiency. A further 3 cents are paid for every sensibly used thermal kilowatt. The law is expected to come into force at the beginning of 2009. The geostructural reality in Upper Bavaria makes it almost impossible to efficiently use thermal energy. Isolated farms, and all around nothing but countryside. And this is why a large part of the heat was simply blown off as waste air. However the aim is to utilize the heat, for example by establishing local and district heating networks. And here lies the future of combined thermal power stations.
 

The farmer fills the maize via a hopper into the fermenter, a kind of enclosed liquid manure trough, where the mash decomposes under the influence of natural and highly sensitive bacterial strains. Methane gas is released during this process. This gas flows through a gas drier installed downstream of the fermenter, is desulphurized and finally ends up in the combustion chamber of a powerful MAN engine. "Our drive unit of choice" says Alexander Niedermeier. The engine cooling water heated to 85 C° is pumped in counterflow through the VT 10 CDH-10 plate heat exchanger from Kelvion. Cold industrial water flows in on the other side of the plate heat exchanger. As it flows through the plates the industrial water adopts the temperature and at the same time cools the process water. Heated in this way, the industrial water flows back into the heating water circuit. The heat exchanger surface area of the 59 plates is 6.56 m2 and generates a heat output of 185 kW. This heat exchanging process is absolutely necessary to cool the engine constantly. If the heat is not dissipated, the unit would overheat and be destroyed. Farmer Anton Obermeier, whose family has been one of the biogas pioneers since 1995, operates a 125 kW plant from "Bayern BHKW" at his farm. 100 % of the electricity is fed into the public grid, and the farmer takes back 15 to 20 kW "to meet the demand for the whole farm complex", says Mr. Obermeier. He can only use 30 percent of the heat to keep the house and the farm at a cosy temperature and to keep the fermenter at a constant 40 C°, the ideal temperature for the fermentation process. Mr. Obermeier's upgraded system has been running without any problems since the end of 2006. In this period 1,277,055 kW of electricity were generated by the unit.

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