HomeDigitalizationAutomationDanish coal-to-biomass conversion gets underway

Danish coal-to-biomass conversion gets underway

Conversion of a Danish coal-fired combined heat and power plant to biomass is underway with today’s announcement that Finland’s Valmet has been contracted to supply the new wood chip-fired plant.

Valmet is set to provide equipment for the conversion of Dong Energy’s 1057 MWe/502 MWth Asnaes district heating plant in the city of Kalundborg after receiving the €80m ($91m) order.

The firm will deliver a 140 MWth biomass-fired power boiler plant featuring bubbling fluidized bed (BFB) technology. The parameters for the boiler are 50 kg/s, 100 bar and 540à‚°C. Valmet will also supply an automation system, which it said covers the whole plant and includes information management and safety systems.

The delivery will also include flue gas treatment consisting of a baghouse filter, combustion air humidification, flue gas condensing, condensate treatment and a stack. And Valmet said it will supply associated equipment, complete above-ground buildings and complete electrification and instrumentation.

A 20-year steam and district heating contract signed this month enabled Dong to carry out the conversion in line with its plan to phase out coal-fired power by 2023. Under the terms of the supply contract signed with utility Kalundborg Forsyning, pharmaceutical firm Novo Nordisk and biotech company Novozymes, the new plant will supply heat and process steam through the existing district heating network.

According to Dong, the conversion will result in an 800,000-tonne reduction in CO2 emissions per year at the Asnaes plant and will make Novo Nordisk’s largest production unit in Kalundborg carbon-neutral, reducing the company’s global carbon emissions by 45 per cent. à‚ 

Dong said the wood chip fuel will come primarily from forestry by-products such as branches, twigs and thinning trees, and suppliers will be required to ensure that the wood chips come from sustainable forestry.

The conversion is planned to begin this summer and the new plant is expected to come online in late 2019. Dong said it will represent the seventh coal-fired plant it has converted to biomass.

Thomas Dalsgaard, Dong Energy executive vice-president, said he was “very pleased that we now have an agreement regarding Asnàƒ¦s power station.

“The future belongs to sustainable energy sources such as wind, solar and biomass. We’ll therefore be phasing out all use of coal at our power stations by 2023, and the decision, which was made together with our customers, is an important step on the way.”