The Klemetsrud facility has three incinerator lines for the energy recovery of combustible waste.
The incinerators heat the water used in the district heating system for Oslo, maintaining temperatures of 850-1,000 °C and operating 24 hours per day. Hundreds of water-containing pipes are installed in the incinerator walls, which are heated by the incinerators, converting the water to steam. The steam has a temperature of 400 °C and a pressure of 40 bar. This means that the steam is completely dry. The dry steam enters the turbine, and accelerates the rotating blades inside the it. This rotation produces electricity via a generator. The steam which leaves the turbine has a temperature of around 120 °C, and a pressure of 9 bar. The steam is then transported to a condenser, where it is condensed (converted into water), and the heat is exchanged against the district heating system.
The water from the steam is then transferred to the boiler, and reheated to create more dry steam. This is a closed-loop, continually circulating process.
When the water becomes steam, this is used to produce electricity via steam turbines. The heat which is not used in the turbines is used for district heating in Oslo’s district heating system.
Energy is also recovered from the landfill gases at the Grønmo waste treatment plant, through the production of electrical energy from gas engines. The electricity produced from the landfill gases at Grønmo comprises around 7 GWh per year. Some of the energy that is produced is used in operating the Klemetsrud facility.
- corresponding consumption
to 32,000 households