Recycled Paper Mill Improves Steam Temperature Control ... · Recycled Paper Mill Improves Steam...
Transcript of Recycled Paper Mill Improves Steam Temperature Control ... · Recycled Paper Mill Improves Steam...
D352328X012/Jul18
PULP & PAPER
Recycled Paper Mill Improves Steam Temperature Control with a Fisher™ DFA Desuperheater Valve
RESULTS
•Improvedsteamtemperaturecontroltowithin0.5degreesFahrenheitofsetpoint
•Eliminatedvalvestickingissuesandavoidedrepairanddowntimecosts
•Reducedthepotentialforthermalshock,vibration,anddamagetodownstreamequipment
•Extendedvalvetrimservicelifebyoneyearandcounting
APPLICATIONTemperaturecontrolofasteamdryeronapapermachine
CUSTOMERRecyledpapermillinTennessee,USA
CHALLENGEGettingsteamtothedryerendofapapermachinetypicallyrequiresadesuperheater(DSH)unitwithanintegralorseparatespraywatervalve(SWV)installedupstreamtocontrolsteamtemperaturenearsaturation.ThecombinationDSH-SWVoptimizesdryingefficiencies.
Duetoitspipingconfigurationandcostposition,arecycledpapermillselectedanintegralsolution.But,thenon-FisherDSH-SWVunitstheyinstalledhaveexperiencedchronicproblems—resultinginpoortemperaturecontrolandanincreasedriskofmaintenanceoroff-specproduct.Theseissueswereprimarilycausedbythefactthatthevalvetrimsetislocatedwithintheprocesssteampipesandexperienceshighertemperaturegradientsthanitwasdesignedtohandle.
Thetemperaturedifferentialbetweenthehotsteamandthecoolingwatercreated“thermalbinding”andcausedthevalvetrimtostick.Thatmeantthevalvecouldnotcontrolhowmuchwaterwasbeingfedintothesteamline.Stickinghadbecomeaseriousproblemforthecompetitorunits.Becausetheproductwasobsolete,thesupplierprovidedvirtuallynosupport.Themill’smaintenancemanagercontactedtheEmersonsalesrepresentative,Experitec,forhelpandalong-termsolution.
“We took the advice of Emerson engineers and implemented a nozzle maintenance program that has helped us avoid the risks and inefficiencies associated with broken or clogged spraywater nozzles. This program is an important part of Emerson’s total solution to improve the uptime and reliability of our steam dryer process.”
Maintenance SupervisorRecycled Paper Mill
PULP & PAPER
SOLUTIONExperitecengineersstudiedtheapplicationandconsultedwithpaperindustryandsteam-conditioningexpertsforFishertechnology.Ultimately,theyrecommendedtheFisherDFASeriesdesuperheatervalvetoreplaceoneofthecompetitor’sunits.
IntheDFAvalve,desuperheatingandspraywatercontrolelementsarepackagedtogether.Theassembly—includingvalvebody,trim,andinsertion-styledesuperheater—addressesthermaltransientconcernsandincorporatesfeaturestooptimizeperformanceandreliability.
•Theblockbodyallowsthetrimtoresideoutsidethesteampipe,separatingitfromthedirecteffectsofhightemperaturesandeliminatingpotentialbindingissues.
•Anintegrallinerinsidethedesuperheaterminimizesthepotentialforthermalshockwhencoolwaterisintroducedtothesteam-heatedpipes.
•TheHelixnozzleblockgeometryminimizesvortexsheddingandflow-inducedvibration,increasingtheunit’sservicelife.
•Toavoidthetimeandcostofpipingchanges,EmersonengineeredaspecialDFAunitthatwouldfitdirectlyintothemill’sexistingpipingconfiguration.
TheFisherDFAdesuperheatervalvesolutionhaseliminatedthevalve-stickingissuessinceinstallationandminimizedunplanneddowntime.EmersonengineersalsoworkedwithmillpersonneltoimplementbestpracticesthatwillmaintainthenewDFAunitanditsspraynozzlesatpeakefficiency.ThemillpurchasedaspareDFAunitforitsinventorytoaddressanyfutureissueswiththefiveothercompetitorunitswaitingtobereplaced.
RESOURCESProduct Bulletin: DFA Series Desuperheatershttp://www.documentation.emersonprocess.com/groups/public/documents/bulletins/d103619x012.pdf
Emerson Automation SolutionsMarshalltown, Iowa 50158 USASorocaba, 18087 BrazilCernay, 68700 FranceDubai, United Arab EmiratesSingapore 128461 Singapore
http://www.YouTube.com/user/FisherControlValve
http://www.Twitter.com/FisherValves
http://www.Facebook.com/FisherValves
http://www.LinkedIn.com/groups/Fisher-3941826
main red
PMS 1795CC0 M96 Y90 K2
YOUTUBE LOGO SPECS
PRINTgradient bottom
PMS 1815CC13 M96 Y81 K54
on dark backgroundson light backgrounds
standard
no gradients
watermark
stacked logo (for sharing only)
standard
no gradients
watermark
stacked logo (for sharing only)
white
WHITEC0 M0 Y0 K0
black
BLACKC100 M100 Y100 K100
© 2015, 2018 Fisher Controls International LLC. All rights reserved.
Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, nothing herein is to be construed as a warranty or guarantee, express or implied, regarding the products or services described herein or their use, performance, merchantability or fitness for a particular purpose. Individual results may vary. All sales are governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of our products at any time without notice. Responsibility for proper selection, use and maintenance of any product or service remains solely with the purchaser and end user.
The Fisher DFA Series desuperheater is used to efficiently control spraywater and reduce the temperature of superheated steam. Featuring variable geometry nozzles, the unit is available with standard or anti-cavitation trim.
D352328X012/Jul18