Metal processing plant

Use of the waste heat from a bell annealing plant

The first commercial waste heat power plant of DeVeTec GmbH has been erected in Hohenlimburg, the location of the BILSTEIN cold rolling mill (www.bilstein-kaltband.de). As part of an increase in capacity, BILSTEIN erected a new state-of-the-art bell annealing plant, which can be operated in an extremely energy-efficient manner thanks to the innovative heat recovery concept. It is possible to save up to 900 MWh of electricity each year.

During the controlled cooling of the coils, waste heat is generated which can be transferred to the ORC medium, ethanol, of the waste heat power plant, via a thermal oil circuit. For this, the ethanol is vaporised and relaxed in the expansion engine of the waste heat power plant. By means of a generator, electricity is generated from the work performed by the expansion engine. The useful heat arising from the waste heat power plant is used at the production location to heat buildings and for temperature conditioning of other equipment components within the production process.

After more than two years of operation, the result is impressive: for each batch, the ORC system generates up to 300 kWh of electricity and up to 5,300 kWh of heat.

 

The system was supported by the Federal Environment Ministry as part of the environmental innovation programme (www.umweltinnovationsprogramm.de).

Use of the waste heat from a bell annealing plant

The first commercial waste heat power plant of DeVeTec GmbH has been erected in Hohenlimburg, the location of the BILSTEIN cold rolling mill (www.bilstein-kaltband.de). As part of an increase in capacity, BILSTEIN erected a new state-of-the-art bell annealing plant, which can be operated in an extremely energy-efficient manner thanks to the innovative heat recovery concept. It is possible to save up to 900 MWh of electricity each year.

During the controlled cooling of the coils, waste heat is generated which can be transferred to the ORC medium, ethanol, of the waste heat power plant, via a thermal oil circuit. For this, the ethanol is vaporised and relaxed in the expansion engine of the waste heat power plant. By means of a generator, electricity is generated from the work performed by the expansion engine. The useful heat arising from the waste heat power plant is used at the production location to heat buildings and for temperature conditioning of other equipment components within the production process.

After more than two years of operation, the result is impressive: for each batch, the ORC system generates up to 300 kWh of electricity and up to 5,300 kWh of heat.

 

The system was supported by the Federal Environment Ministry as part of the environmental innovation programme (www.umweltinnovationsprogramm.de).