Metso and Stora Enso Corp. have inked an agreement for a single-drum conversion of Stora Enso’s Imatra Mills’ recovery boiler, to be completed in the fall of 2012.
The upper and lower drum of the
recovery boiler and the steam generating bank between them will be replaced by
a new drum and separate boiler bank elements needed for heat recovery. At the
same time, the second stage of the economizer will be rebuilt.
“The conversion will
significantly extend the boiler’s lifetime and allow for a possible capacity
increase in the future. In addition, the conversion will improve the boiler’s
availability, secure safe operation and reduce maintenance costs. Further
advantages offered by a single-drum conversion compared to replacing the
existing design are a shorter downtime and the reliability of the solution,”
says Jouni Koskinen, sales manager, boiler conversions, from Metso.
The recovery boiler was built in
1987 and its current capacity is about 1,700 metric tons of dry solids per day.