Instrumentationfor Pulp & Paper Applications

ABB Automation

The purpose of a continuous or abatch digester is to dissolve ligninsfrom the fibers in wood chips.

The cook is performed by heating thewood chips together with sodiumhydroxide and sodium sulphide tohigh temperatures. The bisulphidesprimarily break up lignin bonds to thefibres, while sodium hydroxidedissolves and extracts the lignin.

A primary goal for the cook is toproduce fibers with a certain kappanumber, which relates to how muchresidual lignin there is left on the fibers.To control the cook, it is important tokeep control of al l f low rates,temperatures, pressures and pH.

Mechanical treatment in the fiber lineuntangles fibers and is followed by theremoval of non-decomposed chips(shives), stones and other unwantedparticles.

Dedicated, robust instrumentationand advanced control are required toachieve this efficiently.

The Digester/Fiber Line

Digester – Kymmene mill Finland

AS 800,2000T series

TCA ConsistencyAnalyzer

MAG SM Smart PulpPlatform (SPP)

TB46 conductivityTB82 pH &conductivity

SensyTemp W TR TrioWirl TB(X)557 pH CLA 2000Cooking Liquor

Analyzer

Chip Bin

Impregnator

Heat Exchangers

Steam

P mS

P T F T

P F mS

dP

P F mS

spp

WashWaterChest

Blow Tank

Recovery

Washers

Seal Boxes

High DensityStorage

Digester

mS pH

mS mS mS

pH

F

F

P

P

L

Q

L

P

L

T

P

P

LTF

T

CLA

L

Key

T Temperature (SensyTemp WTR)

P Pressure (AS 800 series, 2000T)

L Level (AS 800 series)

F Flow (MAG SM, TrioWirl)

mS Conductivity (TB82EC, TB46)

CLA Conductivity, alkali, total solids,Dissolved Lignin (CLA 2000)

dP Differential Pressure (AS 800)

SPP Kappa, Fibre size, NIR, (SPP)

Q Consistency (TCA)

pH pH (TB557, TB82pH)

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The Company’s policy is one of continuous productimprovement and the right is reserved to modify theinformation contained herein without notice.

© ABB 2000 (09.00)

ABB Instrumentation LtdOldends LaneStonehouse, Glos.England, GL10 3TATel: +44 (0) 1453 826661Fax: +44 (0) 1453 827856

ABB Automation Inc.2175 Lockheed WayCarson City,NV 89706 USATel: +1 775-883-4366Fax: +1 775-883-4373

ABB Automation ProductsDransfelder Str. D-37079GöttingenGermanyTel: +49 (0) 5 51 9 05-0Fax: +49 (0) 5 51 9 05-777

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