Project information

Construction of a biomass heating power plant in Augsburg East

2 3Kraftanlagen München GmbH | Construction of a biomass district heating cogeneration plant in Augsburg East

General contractor for the engineering and turnkey construction of a biomass heating power plant in Augsburg East.

Project description.

CustomerStadtwerke Augsburg Energie GmbH

Plant descriptionThe site of the plant is in the immediate vicinity of the gas turbine plant in Augsburg-Lechhausen, which Kraftanlagen München handed over to the customer in 2004.

Around 90,000 tons of woodchips fresh from the forest are incinerated in the new biomass heating power plant each year with an energy content equivalent to around 21 million liters of heating oil. The generated electricity supplies over 20,000 households and the extracted district heat supplies 3,500 de-tached houses. This brings the amount of energy generated by Stadtwerke Augsburg to 28 %, thus increasing the security of the supply for customers.

Project milestones

Placement of order September 2006Start of construction March 2007Boiler pressure test December 2007First wood incineration January 2008Lifting into place of steam turbine February 2008Trial operation May 2008Acceptance June 2008

Scope of services Complete engineering of construction, process,

electrical and instrumentation & control systems Construction services, including outdoor installations

and vehicle weighing terminal Fuel store and fuel charging Biomass furnace with steam generator Flue gas cleaning Stack and emissions measuring equipment Steam turbine with generator and air condensation plant Water/steam cycle with water treatment Piping systems and components District heat extraction with underground piping systems Electrical, instrumentation & control and safety engineering Utility services (HVAC, sanitary installations, fire protection

with fire alarm system, smoke and heat extraction systems, lighting and well)

Auxiliary systems (recirculation cooling system for genera-tor and oil cooling, dust extraction system and control air system)

Installation and site management Commissioning and trial operation Training and documentation

Picture above:

Control room.

Picture below:

Steam turbine

and generator.

Flue gas cleaning

with double-stage

electrostatic filter.

4 5

Plant description.

Furnace and water tube boilerThe biomass is transferred to the com-bustion chamber by hydraulic feeders. Incineration takes place on the air-cooled forward-feed grate. The water evaporates in the membrane-wall com - bustion chamber and downstream fur-nace pass. The superheater bundles are installed in a horizontal position in the third pass. The feedwater is preheated in the upright economizer.

District heatingThe energy from the steam extracted from the turbine is transferred to the district heating water in a steam/hot wa-ter heat exchanger (heating condenser). In the event of a turbine failure, the steam supply to the heating condenser can be maintained by means of a redu-cing station. Pumps transport the heated water to the municipal district heating network through underground plastic-cased piping systems.

Technical data

Fuel Mass flow 8 - 13.5 t/h Calorific value 7 - 12 MJ/kg

Biomass boiler Thermal furnance output 27.8 MW Main steam volume 30 t/h Main steam parameters 485 °C, 65 bar

Steam turbine Max. electrical power 7.66 MW Condensation machine with one extraction point

District heating Max. district heat output 15 MW Forward/return temperatures 130/60 °C Underground plasticjacket pipe DN 350

Water/steam cycleThe steam from the biomass boiler is converted into electricity in the steam turbine. Steam for heating the district heating water is extracted downstream of the high-pressure section. The re mai n - ing steam is condensed in the air con- densation plant. The condensates are transported to the feedwater tank and are later fed into the biomass boiler for evaporation.

Flue gas cleaningThe flue gases are cleaned in a double- stage electrostatic filter system with an up-stream multicyclone. The cleaned flue gases are transported to the 37 m high stack by means of an induced-draft fan. A silencer ensures adherence to permit-ted noise levels at the stack outlet.

Functionality of the biomass power plant in Augsburg East.

Kraftanlagen München GmbH | Construction of a biomass district heating cogeneration plant in Augsburg East

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Environmental protection.The use of CO²-neutral fuel and the efficient combustion

technology are protecting the environment.

Electrical and instrumentation & control systems.

Operating conceptThe biomass district heating cogeneration plant is equipped for operation without continuous supervision (24-hour interval). The fully automated plant can be operated and monitored from the process control system in the control room.

Instrumentation & control systemThe plant is fully integrated into the existing instrumentation & control system of Stadt- werke Augsburg and can be remotely ope- rated from any other of their plants through- out the city. Similarly, all other plants can be operated and monitored from the new bio- mass heating power plant.

High level safety technology: operating concept and control systems of the biomass heating power plant.

Electrical systemsThe biomass heating power plant has an auxiliary power transformator as well as LV- and MV-switchgears and is fitted with a Siemens PCS7 process control system. A controlled shutdown of the plant is gua- ranteed, since the process systems as well as the compressed air supply and the auxiliary cooling water systems can be powered interruption-free even in case of a power outage. A fire detection sys-tem ensures maximum fire protection.

Kraftanlagen München GmbH | Construction of a biomass district heating cogeneration plant in Augsburg East

FuelWoodchips produced from untreated virgin wood in accordance with the Re-newable Energy Act are used exclusively as fuel. These are mainly obtained from small-diameter wood from the region which cannot be used for the production of other materials. The water content of the fuel is in the range 30 to 60 %.

Fuel storage and transport90,000 tons of virgin woodchips fresh from the forest are delivered annually by road. The fuel is stored in an open space warehouse with a capacity of 12,000 m³. From there front-end loaders are used to transport the fuel to two redundant moving-floor conveyors. Hydraulic con-veyor equipment and down stream drag chain conveyors trans port the wood to the infeed shaft for the biomass boiler.

Combined heat and powerThe new biomass heating power plant operates according to the principle of

combined heat and power. The simultaneous generation of electricity and heat achieves a fuel efficiency of over 70 %.In addition to this around 55,000 tons of CO₂ emissions are avoided annually, since only the same amount of CO₂ is re- leased during the incineration of biomass as was previously consumed when the raw material was growing.

Picture above:

Fuel storage.

Picture below:

Fuel.

Kraftanlagen München GmbH | Errichtung eines Biomasse-Heizkraftwerks in Augsburg-Ost0911.07.1 • 20.5.944

Divisions of the Kraftanlagen München Group

Power plant technology

Energy technology

Renewable energies

Underground piping construction

Utility services

Chemical and petrochemical plants Fabrication

Engineering services

Kraftanlagen München GmbH

Ridlerstrasse 31 c | 80339 Munich

Germany

T: +49 89 6237-0 | F: +49 89 6237-223

info.muenchen@ka-muenchen.de

www.ka-muenchen.de