Energy efficient evaporation in future pulp and paper mills
Paper in proceeding, 2002
In this paper ways to design energy efficient
evaporation plants in future pulp and paper mills are
discussed. There is more than 1 GJ/ADMT excess
heat in the model mills studied that can be made
available for use in other parts of the mill. If this
heat is used for evaporation and/or if the evaporation
plant is designed to use MP steam and deliver LP
steam to the steam network, large amounts of steam
can be saved. It is shown that these savings lead to
reductions in CO2 emissions; the largest reduction
are achieved if assuming that oil can be saved or if
biomass fuel is exported from the mill and used to
replace oil elsewhere. It is also shown that the
economic incentive for redesigning the evaporation
plant depends on how the saved live steam is used
and the economic conditions assumed. The largest
savings are obtained if the live steam savings lead to
decreased oil consumption. If producing condensing
power or excess bark that can be sold, the savings
are smaller, but in most cases still considerable in size.