T. Kohl, N.A. Pambudi, T. Laukkanen, C.-J. Fogelholm
This paper investigates the influence of the integration of communal biomass-fired combined heat and power plants with wood-pyrolysis on the plant's energy balance and product distribution. Further the proposed integration concept's influence on the environmental performance of the connected district heating network is pointed out. The environmental performance is evaluated by means of the primary energy factor and the CO2 emission coefficient. For this evaluation, the European standards EN 15603 and EN 15613-4-5 are applied and modified. The concept comprises the integration of a simple pyrolysis model and of a steam dryer with a base case combined heat and power plant. The yearly plant output is calculated by applying a multiperiod model of the heat duration curve. The work shows that, by co-generation of valuable pyrolysis product, operation hours and electricity production can be considerably improved. The integration also clearly improves the district heating network's primary energy efficiency and lowers its carbon dioxide emissions significantly.
Aalto University, Dept. of Energy Technology, Espoo, Finland; Semarang State University, Semarang, Indonesia
