21 December 2007

Mechanical vapour recompression heat pump in a Swedish pulp and paper mill

In September 1999, a mechanical vapour recompression heat pump was commissioned at Stora Enso
Nymölla Mill, a sulphite mill producing fi ne paper. The heat pump upgrades low-pressure steam from one
of the evaporation plants to replace live steam in some parts of the mill.
The main objective for the installation was to reduce the fuel cost (mainly oil, but to some extent also biomass),
and to increase the capacity of steam production. A reduction in fuel costs of about 10 MSEK/year
(~1.1M€/year) was accomplished.