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District energy

District heating

CHP Multi-fuel Avedoere 2 in Copenhagen, design

2. September 2011

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Ramboll is a leading international engineering, design and consultancy company, owned by the Ramboll Foundation.

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Located on the coast just south of Copenhagen, Unit 2 of Avedøre Power Station uses natural gas, oil, straw and wood pellets for simultaneous generation of heat and electricity.

The plant is one of the most efficient in the world, as it exploits up to 94 percent of the energy in the fuels and has an electrical efficiency of 49 percent.

Mastering the multi-fuel biomass challenge Ramboll Power has, since the conception of Avedøre Power Station's Unit 1 in the 1980s been a regular provider of expertise to the owner of the plant Ørsted on a wide range of specialist issues.

Since the construction in 2001 of Unit 2, Ramboll Power has participated in the development of the plant's continuous and flexible adaptations to new fuel types, leading up to today's state-of-the-art multi-fuel production of power and of heat for the Copenhagen district heating system.

The first unit Avedøre 1 was put in operation in 1990 at very this new site in the south western part of Copenhagen for strategic reason in order to be able to deliver heat to the growing integrated district heating system in the Copenhagen Region. Unit 2 followed 10 years later. The two advanced 2x22,000 m3 heat accumulators allows the plant to optimize the heat and power production.

Technical Specifications
A model for multi-fuel adaptation, the heart of Unit 2 consists of an 80 m high tower boiler linked to a steam turbine and a generator. The boiler, fuel logistic and combustion system enables a fully fuel-flexible operation on either coal (100 percent load), oil (100 percent load), Ngas (100 percent) or biomass (70 percent load). An additional separate, dedicated biomass boiler operating on straw features an output capacity of 45 MW. Firing up to 25 tonnes of straw per hour, it is innovatively connected directly to the main boiler steam cycle, providing high-efficiency heat and power based on biomass.

In addition, the plant comprises two separate gas-driven turbines, each with a capacity of 110 MW. The gas turbines are connected to the main steam cycle as feed water heaters, providing the capability to switch flexibly between heat or power driven operation.

Unit 2's highly efficient use of fuels is reached through elevated steam data, i.e. by firing at 300 bar pressure at a temperature of 600˚C.
A complex fuel logistics system is connected to the plant with two silos carrying a capacity of 100,000 tonnes each, and with adjoining harbour facilities that allow for biomass to be shipped in from abroad or from a pelletation plant further down the coast – also designed and constructed by Ramboll Power - to be shipped directly to the door.