SuperWash™ Technologies Brown Stock Washing Discovery Questions

SuperWash Value Levers: Increased black liquor solids provide steam

savings: 1-4 points

Reduced bleaching costs due to less carryover to Bleaching System: As much as $3.00/ton

Lower defoamer cost by 10-40%

Increased production by 1-4% at same quality specs

Improved pulp quality; reduced silicone carry over, less off-spec paper

Improved washer control to reduce risks associated with vats overflowing

30,000 Foot View – Big Picture Questions• WhataretheKeyBusinessDriversforthepulpmill?

• Whatarethepulpmill’soperationalgoalsandwhy? a)IncreasedProduction? b)Increasedliquorsolids? c)LowerBleachingcosts? d)Improvedpulpquality/reducedsiliconecarryover?

• Whatispreventingcustomerfromreachingtheopera-tionalgoalsnow?

• Wherearethebottlenecksintheprocessthatkeepthemfromreachingtheirgoals?

• Arethereanyrestrictionstothetypeofwashaidused? a) EBS, silicone, silica, oil, FDA Approval, BfR Approval, etc.

• Whattonnagecapacityisthepulpmilldesignedto produce?

Peel the Onion- Drill Down Questions• Howmuchoverdesign-capacityisthemillrunning? –Whatisthespecificloadingofthecustomer’swasher? – On rotary drum/vacuum Brown Stock washer – The

design parameter is defined as oven-dry (o.d.) tons per day of pulp per square foot of a single stage cylin-der surface. Typical design: specific loadings are in the range of 0.6 to 0.8 oven-dry tons/day/ft2. Some mills have converted from older, wire-wound drum design to a “Corru-Deck”. The Corru-Deck design was set up to handle 1 air dry ton/day/ft2. Many mills exceed this design parameter and are now operating in the 1.2-1.4 air dry ton range.

• Whatarethecurrentweakblackliquorsolids? – 1% increase in solids = ~$1,000,000 savings in steam

and energy –Whatisthelimitingfactor?

• BleachingCosts: – What is current usage (and cost) of following bleaching

chemistries:

• SulfuricAcid

• ChlorineDioxide

• HydrogenPeroxide

•Caustic – Does mill measure the Chemical Oxygen Demand (COD)

ofthepulpenteringbleaching?Ifso,howoftenandwhatarethenormalvalues?

• Howdoyoumeasuresodaloss?Whatisyourtarget? – Does the mill ever target a higher soda loss target due

to issues in the Evaporators or full Weak Black LiquorTanks?

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• Doyouhavehistoricaldataforwasherefficienciesordisplacementratios?

– Washer Efficiency - The % efficiency at which a single washing stage displaces showers, dilutes and re-thickens the stock. A measure of the effectiveness of the washer.

– Displacement Ratio - The effectiveness of a single displacement washing stage in removing solids from the pulp. Defined as the ratio of the actual reduction in solids content in the stage compared to the maximum possible reduction.

– Running WE and DR are excellent ways to differentiate from the competition and show value!

• Isthereaspecificwasherthatisaproblemforyou?

• Doyouswitchbetweenspecies?HardwoodtoSoftwoodandback?

– Managing a Brown Stock washing system is the most difficultwhenswitchingfromSoftwoodtoHardwood.The Softwood liquor has a higher viscosity, the Hardwoodfiberisshorter.Thisscenarioisthemostdifficult to wash.

• DoyouhaveanybaselinedataonsiliconecarryoveronthecurrentBrownStockwashingprogram?

• Doyouhaveanypitchissuesinthepulpmilloronthepapermachine?Sheetdefectsordefoamer/pitch“balls”depositingincleaners?

• Whatistheresidualalkalilevelintheblownpulp? –Howoftenisitmeasured,andhowmuchdoesit

normallyvary? – If running softwood, any visual indications of soap

inthewashers?

Technical Assistance:The Pulp ITC team brings a wealth of knowledge to you and your customer. They can find the hidden value in many cases and ensure you are providing the best value proposi-tion to your customer possible. To get the most out of your integration with the ITC team please have the following basic system information available.

PROCESS INFOMATION DEFOAMER INFORMATION

Production Rate Supplier, Product, Type

Wood Species Usage lbs/ton

Washer Type Feed Points

Conductivity / Temp Profile Feed Controls

Conductivity Target Type of feed equipment

Weak Black Liquor Solids