News - Stora Enso Oyj, Anjala Mill

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News - Stora Enso Oyj, Anjala Mill

News - Stora Enso Oyj, Anjala Mill

Newsgrafik #115931
 19.01.2017

Erfolgreicher ANDRITZ-Umbau einer Schlammschneckenpresse für Stora Enso Anjala  (Firmennews)

Der internationale Technologiekonzern ANDRITZ hat den Umbau einer Schlammschneckenpresse für Stora Enso Anjala in Anjalankoski, Finland, erfolgreich abgeschlossen.

Der schlüsselfertige Umbau der Schneckenpresse, die seit einigen Jahren nicht mehr in Betrieb war, umfasste die Demontage der Siebkörbe und der Schnecke, den Umbau der Körbe mit neuen Siebplatten, eine Überholung der Gegendruckeinrichtung, die Lieferung aller für die Umbau benötigten Teile sowie die Montage. Die modernisierte Presse ersetzt eine bestehende alte Entwässerungsmaschine.

Vor der Auftragsvergabe wurden von ANDRITZ intensive Schlammtests durchgeführt, um die Eignung der Schneckenpresse in Bezug auf die geforderte Entwässerungskapazität und den zu entwässernden Schlamm zu prüfen.
(Andritz AG)

Newsgrafik #81851
 22.06.2011

STORA-ENSO ANJALA PM2 OPTIMIZED DRYING SECTION PRODUCTIVITY  (Company news)

(Picture: Project Manager Mika Hovilainen, EV Group)

Poor runnability at Stora Enso Anjala PM2 (bookpaper) drying section created problems in higher machine speeds. In the double felted section sheet fluttering caused wrinkles. In single felted section it was impossible to increase the speed, because the web did not release nicely from contact and followed the upper cylinder surface.
The PM2 drying section runnability was optimized in two steps. In 2009, runnability problems of the double felted section were eliminated with machine geometry modification and EVdf Web Stabilizers tailored for the area.
In the second step, in 2010, runnability of the single felted section was optimized with the EV EasyOne technology. Project Manager Mika Hovilainen,
EV Group: ”The problems because of poor runnability are eliminated after the web stabilizing projects in single and double felted sections. We have now more stable sheet run, and the drying section runnability enables also higher speed.”

Optimization of Double Felted Section, 2009
Complicated machine geometry created runnability problems at the 4th dryer section. The sheet release from contact was unstable causing fluttering and wrinkles in the long open draw.
This problem was eliminated with both machine geometry modification and web stabilizers. Offset felt configuration and EVdf stabilizers tailored for the double felted section optimized the runnability in the area. Wrinkles were no longer created and it was possible to increase the PM speed.

Optimization of Single Felted Section, 2010
The speed increase was still difficult because of the runnability problems in the first, sensitive groups of the single felted section. Old, ineffective stabilizers (with only 300-400 Pa vacuum) did not support web release from contact of the upper cylinder. It was impossible to increase the PM speed, because the wet, sensitive web was following the upper cylinder surface in the 1st and the 2nd dryer groups of the area. Cylinders 4 and 10 were closed to help the problems but this decreased the drying efficiency of the section.
EV Group proposed to solve the problems with the EV EasyOne technology, which creates high release vacuum and supports the sheet between the upper cylinder and the vacuum roll. With a high release vacuum as 2000 Pa, sheet release can be optimized up to speed of 1500-1600 m/min. The first stabilizer with a high release vacuum area was installed for a test run at the 4th cylinder. After
successful test period and problems in this position were eliminated, the mill invested in EV EasyOne stabilizers for the entire 1st and the 2nd dryer groups.
Without support the web does not release from contact between upper cylinder and vacuum roll. This results in breaks and paper defects.
EV EasyOne technology ensures the web release between the upper cylinder and the vacuum roll. This optimizes drying section runnability and draw, and enables improved paper quality.
The optimization project clearly improved the single felted section runnability. EV EasyOne technology enabled the speed increase, because the web is now constantly kept in contact with the fabric and there is no sheet fluttering.
The PM run with less draw between the press and drying section is also possible after the project. In addition, optimization enabled more efficient drying because it was possible to increase the steam pressure and there is no
longer need to control runnability with closed cylinders.

Runnability Optimization of double felted section, 2009:
machine geometry modification and 8 units of EVdf stabilizers
- speed up from 1250 m/min --> 1300m/min
- runnability clearly improved
-no wrinkles

Runnability Optimization of single felted section, 2010:
6 units of EV EasyOne
- EV EasyOne for test run at 4th cylinder: speed 1330 m/min
- EV EasyOne stabilizers with high release vacuum area for the entire 1st and 2nd dryer groups: speed 1365 m/min
- runnability even better
- no sheet fluttering
- less draw
- increased steam pressure, no closed cylinders

RESULTS:
- remarkable improved runnability thanks to constant wire contact
- increased speed enables additional production
- more efficient drying
- improved paper quality
(EV Group Oy - EVG)