Biomass is a renewable source of energy using either prime crops (e.g. Withys) or by-products (e.g. wood chips from manufacturing timber). We are focussing on using waste-wood, in chip form (not pellets which are a higher grade and more expensive fuel).
Present biomass projects typically utilise large steam turbine equipment leading to high biomass transport costs (and environmental impacts). To date most projects involve burning the biomass to produce heat. Our air turbines are economic at much smaller power outputs and provide a viable way to upgrade these systems to also produce electricity. We are operating our first DUO+ system in a commercial application in Dudingen, Switzerland and are achieving the following performance:
At 15 Deg C ambient, 680 Deg C turbine inlet temperature:
Turbine air mass flow: 1.7kg/s
Temp of air returning to furnace: 406 Deg C
Thermal input power: 577kWth
System electrical efficiency:18.5% (based on LHV of fuel and gas circulation)
Link to full datasheet here