Aalborg Energie Technik a/s Biomass Combined Heat and Power Plant
A major benefit from building the biomass-fired combined heat and power (CHP) plant was eliminating the waste wood, dust and other excess biomass, produced daily at the sawmill and the factory for insulation (Dämmstoffe). The plant has an annual fuel input of 53,000 tonnes of uncontaminated wood, wood waste and demolition wood.
The plant was completed and commissioned in 2004 and supplied within 15 months.
In 2012, the whole CHP plant operated 8,472 hours, and thereby achieved an availability of approx. 97% (latest available figures).
In 2010, Schneider invested in a factory producing insulation material based on wood fibre and this factory required additional steam and hot air on a 24/7 basis.
AET designed the concept for process integration and energy optimisation in order to be able to supply the extra energy required. The existing CHP plant was retrofitted with an extra backpressure steam turbine to supply 18 bar steam, additional extraction from existing turbines (at 1,6 bar), extraction of hot air from ACC and additional air heaters in the flue gas stream. The AET Biomass Boiler was at the same time upgraded from 27 MWt to 30 MWt.
AET performed the engineering for the full concept and retrofitted the existing CHP plant as well as upgrading of the PLC control system and SCADA.