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5<br />
Cross Division Cooperation<br />
One of North America’s largest market<br />
pulp machines had been unable to<br />
achieve its design production goals due<br />
to water rejection in the second nip. After<br />
the mill and several suppliers had focused<br />
on trying to correct the problem<br />
through changes around the second<br />
press, the mill contracted <strong>Voith</strong> Process<br />
Solutions to address the problem.<br />
Through observation of machine operations<br />
and a series of diagnostic tests, the<br />
Process Solutions specialists concluded<br />
that the problem was due to inadequate<br />
water removal in the first press. Since<br />
the first press had already been optimized,<br />
Process Solutions made the recommendation<br />
of adding another high<br />
Customer Pulp and <strong>Paper</strong> Mill Site<br />
(local network)<br />
(40% Cons)<br />
Presses<br />
(20-25% Cons) (10-12% - Cons) (.5- .75%)<br />
(7% Moisture)<br />
Saveall<br />
Max 30 - 40 TPH<br />
Hot<br />
CAL<br />
Box<br />
2ND DRYERS<br />
Sec<br />
Pri<br />
2ND DRYERS<br />
HB<br />
HB<br />
Blow<br />
Reel STKS<br />
Stm<br />
1ST Dryers<br />
Box<br />
Box<br />
Wdyd Sweco (4)<br />
Biocide<br />
STKS<br />
Defoamer<br />
FOURDRINIER<br />
PE<br />
HD<br />
Tank<br />
Broke<br />
LD<br />
Couch Clarified<br />
Filt<br />
75 Tons<br />
Cons<br />
White<br />
Wdyd<br />
WW<br />
@12%<br />
Broke<br />
Repulper White<br />
Wdyd<br />
WW<br />
@12%<br />
Broke<br />
Repulper<br />
35 Tons<br />
MWW Water<br />
Tank<br />
Chest<br />
@ 4%<br />
Defoamer<br />
Sec Fib<br />
Barium<br />
Dispersant<br />
Sec<br />
Wt.<br />
Acid Size Sec<br />
Wt. & Defoamer<br />
Acid Size<br />
Dry End<br />
Primary<br />
Valve<br />
Fiber Wire Showers<br />
Pulper<br />
Silo<br />
Pri Mach<br />
Sweetener<br />
6 Tons<br />
Alum<br />
1<br />
@ 3.5 %<br />
77<br />
Acid<br />
Vacuum Sump<br />
Refiner<br />
Cons<br />
Vacuum Sump<br />
Refiner<br />
Pri Refined<br />
7 Tons<br />
Primary<br />
@ 4 %<br />
(1)<br />
Fan<br />
2<br />
Pump<br />
Steam<br />
Ret<br />
8<br />
Sec<br />
Ret<br />
Sec Screen Rejects Bird<br />
Aid<br />
Refiner<br />
Screen Primary (3)<br />
Bird<br />
Primary Accepts<br />
Refiner<br />
Ret<br />
Screen<br />
Alum Aid<br />
REJ<br />
3<br />
Acid<br />
Flatbox<br />
Seal Pit<br />
Rejects<br />
Refiner<br />
Cons<br />
Sec Silo<br />
Acid<br />
Primary<br />
Reject<br />
Sec Raw<br />
Sec<br />
Reject<br />
Sec Raw<br />
Sec<br />
Rej<br />
Raw<br />
Tank<br />
Tailing<br />
5 Tons<br />
14 Tons<br />
Couch<br />
Fan<br />
Tank<br />
Tailing<br />
5 Tons<br />
Scrn Tail<br />
14 Tons<br />
Couch<br />
Fan<br />
Scrn Tail Tank<br />
Machine<br />
Pump<br />
Tank<br />
Scrn<br />
4<br />
@ 4.5 %<br />
@ 4.5 %<br />
Pit<br />
Machine<br />
Pump<br />
Scrn<br />
White Water<br />
Accepts<br />
Refiner<br />
Acid Cons<br />
Accepts<br />
Stock Dilution<br />
Rejects to<br />
5<br />
#4 HD<br />
#5 HD<br />
Sewer<br />
300 Tons<br />
225 Tons<br />
@ 12 %<br />
@ 12 % Cons<br />
Silo<br />
Cons<br />
Refiner<br />
Makeup<br />
Wt.<br />
Valve<br />
Barium<br />
Dispersant Sec Mach<br />
2 Tons<br />
@ 3.5 %<br />
6<br />
Refiner<br />
Controls Freeness<br />
(length of Fiber)<br />
Cons Sec Refined<br />
3 Tons<br />
@ 4 %<br />
#1 HD<br />
#2 HD<br />
450 Tons<br />
450 Tons<br />
@ 12 %<br />
@ 12 %<br />
Cons Cons<br />
Mill Data –<br />
hundreds of variables<br />
Service<br />
Fig. 4: Suction Roll modification.<br />
Fig. 5: ProcessPlot.<br />
vacuum zone to the existing suction box.<br />
Working with the local <strong>Voith</strong> service<br />
center, a competitor’s suction box was<br />
redesigned to improve performance<br />
(Fig. 4). The Springfield, Oregon Service<br />
Center carried out the modifications and<br />
the mill re-installed the roll in the machine.<br />
Since installation of the modified roll, the<br />
machine has increased speed by 300 fpm<br />
and is producing an additional 400 TPD.<br />
The mill has also had the suction box for<br />
the spare roll modified by <strong>Voith</strong>.<br />
These examples and many others show<br />
the ways that <strong>Voith</strong> Process Solutions is<br />
working with our customers to improve<br />
productivity and quality over the life of<br />
the paper machine.<br />
<strong>Voith</strong> Process Solutions<br />
Mirror Server<br />
OSIsoft<br />
Consultants,<br />
Software<br />
Baseline Calculator<br />
<strong>Voith</strong><br />
Process<br />
Solutions<br />
Step I<br />
Establish a Baseline<br />
Identification of Missed Profit<br />
Opportunities<br />
Innovative New Technologies<br />
Selected key<br />
“Profit Opportunity”<br />
Authorized Users<br />
Step II<br />
The ProcessPlot program<br />
is used to analyze the<br />
selected Profit<br />
Opportunities to deliver<br />
potential solutions<br />
Step III<br />
Process Change Implementation<br />
Using DOE Strategy<br />
57<br />
<strong>Voith</strong> Process Solutions is now introducing<br />
advanced diagnostic systems to further<br />
support customers in getting the<br />
most out of their equipment. Working<br />
with the leading experts in process information<br />
systems, <strong>Voith</strong> Process Solutions<br />
has developed the ProcessPlot system<br />
which allows us analyze data gathered<br />
through the paper mill’s data historian<br />
and distributed control systems as never<br />
before (Fig. 5). With ProcessPlot, <strong>Voith</strong><br />
Process Solutions can assess and quantify<br />
process control issues that had previously<br />
gone unnoticed. The unique value<br />
of ProcessPlot is to quantify economic<br />
opportunities on the machine and provide<br />
financial justification for recommended<br />
changes.<br />
<strong>17</strong>/04<br />
4
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