Location: GLO - Global
This activity represents the combustion of natural wood chips from forest in Switzerland in new (=installed in 2014) boilers and is used for the global activity as first approximation with uncertainty factors adjusted accordingly. Equipped with an industrial electrostatic precipitator in order to comply with PM emission regulation as well as with an SNCR device for reduction of NOx emissions. Characteristics of the of wood chips to be burned: Dry wood density 650kg/m3; Energy content (LHV, oven-dry) 19.1 MJ/kg. The humidity when burned is assumed to be at an adequate level for appropriate combustion, which is achieved after some weeks of natural drying in the storage.Air emission factors as well as the boiler efficiency represent average annual operation including start and stop (warm-up and shut-down). Therefore, emission data will be higher and efficiency will be lower than rated values provided by manufacturers. The inventory shall be considered as being representative for boilers with nominal capacities above 2 MW.
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Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.