Melsungen, Germany
Operational since 12/2014
.
The PROLIGNIS GmbH & Co. KG in Ingolstadt developed the project at the Melsungen site and subsequently implemented it through the newly established company HHKW Melsungen GmbH & Co. KG. The Viessmann Deutschland GmbH was contracted by the project company to supply, install, and commission the plant equipment for the wood-fired combined heat and power plant. As a service provider for the Viessmann Deutschland GmbH, SEEGER ENGINEERING AG provided the process engineering planning, approval planning, and construction management for the plant. Construction work began in October 2013, and the installation of the plant equipment started in March 2014 at the heat and power plant. After successful installation, the warm commissioning phase began in October 2014. The first synchronization took place in mid-December 2014. Since early 2015, the B. Braun Melsungen AG has been continuously supplied with heat and steam from the new wood-fired combined heat and power plant. The generated electricity is fed into the public power grid and compensated in accordance with the EEG 2012.
The wood-fired combined heat and power plant utilizes renewable resources, specifically forest residual wood and landscape maintenance cuttings, as fuel. The fuel is delivered to the fuel feed hopper through a push floor system, a vibrating chute with foreign material separation, and a subsequent scraper chain conveyor. From the fuel feed hopper, the fuel is fed into the combustion grate. The combustion grate is designed as an inclined reciprocating grate. The water inside the boiler is vaporized and subsequently superheated. The ash generated on the grate is collected and discharged in a wet ash extractor. At the end of the boiler, the flue gas exits, undergoes dust removal in an electrostatic precipitator, and is emitted through a chimney. The superheated steam is expanded in a turbine, and the resulting mechanical work is converted into electricity by a generator. Steam is extracted from the turbine through controlled extraction and tapping points. The extracted steam is provided as process steam and for internal consumers. The tapped steam is used for heat supply to B. Braun Melsungen AG and for internal consumers. The steam condenses in an air condenser, and the heat is released to the ambient air.
Grate firing with inclined reciprocating grate
Combustion heat capacity
max. 22,6 MWth
Landscape maintenance cuttings and clearance and forest residual wood
Open storage
11.700 m³
Push floors
approx. 700 m³
Steam capacity
max. 24 t/h
Type
Vertical water-tube boiler
Steam temperature/pressure
485 °C/65 barabs
Type
Extraction-condensing turbine
Inlet
64 barabs/480 °C
Controlled extraction
17 barabs/315 – 320 °C
Uncontrolled extraction
1,5 – 5 bar/150 – 250 °C
Exhaust steam
0,1 bara
Electrical power
max. 4,4 MWel
Dry electrostatic precipitator