Data description

Data description

Energy input and output

Fuel inputs to the sites have been reported in GJ. The lower calorific heat values have been used to calculate GJ from m3 or tonnes of fuel. Fossil fuel and biomass fuel have been reported separately.

The energy figures for the sites include both energy for process and energy for infrastructure. No attempts have been made to differentiate between these two types of energy usage because process energy dominates (98% or more). 
Input of electricity into the sites is also reported. The electricity produced at the site itself is not reported. Some mills sell energy externally in the form of electricity, steam or warm water.

The production sites are treated as a black box in the database, giving data on inputs and outputs only. Because no information is given about what happens within the box it is not possible to calculate an energy balance with the data in the database.

Within this black box, energy is recovered through the burning of black liquor and bark from the wood coming in at production sites for primary fibre-based paper production. Most of the energy used in the process for Kraftliner production comes from internal burning of the black liquor. This inherent energy is not reported as part of the fuel input. The total energy input for the process for Kraftliner production including the black liquor burning is around 13 GJ/tonne. The total energy input for the process of Semi Chemical Fluting production is around 10 GJ/tonne. Energy from internal incineration of rejects at the site is also not reported as part of the energy input.  

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Allocation of energy to paper grades when a mill produces more than one paper grade

The energy is measured, because it is paid for. Allocation for fuels and electricity input is calculated according to energy (heat and electricity) required for the production of the different paper grades. Allocation of the other fuels, such as diesel oil used for internal transportation, was calculated according to mass production of each paper grade.

There is no technical reason for differences in energy consumption between Testliner and Recycled Fluting. However, the weighted averages for each paper grade do show differences because different mills are included in the samples. To prevent misunderstanding, the same amounts for energy consumption and emissions to air for both paper grades are reported as their weighted average.