By Jens Dall, Managing Director, Dall Energy
In Rouen, France, Dalkia needed a biomass boiler, and they chose Dall Energy. The technology was chosen for two main reasons; Firstly: the patented gasification system allows for a cleaner combustion ensuring air emissions to be significantly lower than what can be obtained with traditional grate incineration system. Also, the furnace design contains no moving mechanical parts, which limits the extent of main- tenance works over the lifetime of the plant. Dall Energy has developed a disruptive biomass furnace that reduces dust and particle emissions by more than 90 % and can easily meet the demands in the medium combustion plants (MCPs) directive from 2018, and offer a whole new set of other benefits to outperform current state-of-the-art, the well-known grate combustion technology: • Lower investment (much simpler design with very few moving parts) • Lower maintenance costs (no technical difficulties, low power consumption) • Very wide load window (fast and easy modulation between 10 % and 100 % load without problems) • Reduction of fuel cost as the technology is very fuel flexible, enabling conversion of a wide range of low-value fuels such as wet and dry biomass, organic waste streams, willow, pellets, etc. in the same furnace
The MCP directive tightens emission values, puts forward demands for emissions monitoring. Today’s technologies cannot meet the demands set forth by the directive by any other means than adding expensive emission reduction systems to their solutions. The low emissions and the fuel flexibility were the main reasons why Dalkia – a subsidiary of EDF, the main electricity company in France – started to investigate this technology in 2015. After several meetings and a fuel test of French fuel, Dalkia decided to purchase a gasifier unit for the city of Rouen in France. CONSTRUCTION UNDERWAY Dall Energy has received funding from the European Union’s Horizon 2020 Research and Innovation Program under Grant Agreement no. 811529, to upscale and demonstrate the technology. The plant will supply up to 17 MW of heat to the network and run for more than 7,000 operation hours per year. A seemingly straightforward demand, however, the constraint is that the district heat network has no buffer tanks for hot water storage.
Thus, the new heat plant needs to be able to respond and adjust accordingly to fluctuating daily heat demands on network.
D I S T R I CT ENERGY - SUS TA I NAB L E C I T Y T RANS FORMAT I ON
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