Moving toward CO2 neutrality by utilizing CFB, case study

Denmark's largest utility company, HOFOR, started erecting a new power plant in September 2016. The power plant is located at Amagervaerket in Copenhagen, and is a big step toward the CO₂-neutral Copenhagen targeted by 2025. The plant will use 100% clean, wood-based biomass, and will replace an old, coal-fired unit. The reduction in CO₂ emissions will be 1.2 million tonnes per year.

Amagervaerket is located almost in Copenhagen city center, and the new plant will produce district heating and electricity for the greater Copenhagen area. The district heating capacity is 415 MJ/s, with electricity production of 150 MWe. The biomass fuel arrives at the plant by ship. The design range for the calorific value of the biomass is 6–15 MJ/kg, with a moisture content of 25–60%. The steam values of the boiler are a 560 °C and 140 bar steam flow of 184 kg/s.

The boiler supplier for the new plant is Valmet. The boiler is based on circulating fluidized bed (CFB) technology. Valmet has a long history with CFB boilers – the brand name CYMIC is well known in the market, with more than 85 boiler references. Valmet is also delivering a fuel storage and conveying system. The fuel storage capacity is seven days' worth of fuel.

A white paper paper found HERE introduces the HOFOR Amagervaerket power plant in detail, including all sub-systems. It also explains the technical challenge, as well as the solution for it, a combination of a wide selection of biomass properties and high steam temperature. Valmet has previously delivered large CFB boilers for biomass, such as the Alholmen Kraft 260 MWe boiler, and TSE's 150 MWe boiler. The paper compares these three units and presents the experience gained in these projects.

For more information, contact your Valmet representative.