news briefs 2012 biomass boiler workshops boiler news€¦ · combustion system modifications to...

Boiler NewsNumber 39, Spring 2012

Biomass, Chemical Recovery & Energy-from-Waste

INSIDE THIS ISSUE

•RecoveryBoilerCapacityUpgradesandNOxReduction–JansenAwardedUpgrades

•BoilerMACTandCISWIRulings–AnotherUpdate

•ChangingoftheGuardatJansen

•UpdateonBiomassBoilerCombustionSystemUpgrades

•UpgradingAdditionalRDFBoilers

•NewEmployees:RogerLawtonandMorielArango

• JansenProjectsinCanada•NewsBriefs•VisitJansen’sBoothatUpcomingConferenceTradeShows

•ReceiveOurNewsletterbyE-mail

•BoilerHouseCartoon•AnnouncementPSA/JansenBoilerWorkshopinPrague

•Dates&LocationsBiomassBoilerWorkshopsin2012

OUR MISSION

Our Company provides

combustion, boiler, and

energy technologies, products,

and services.

We are dedicated to working

with our clients to help define

and achieve their productivity,

reliability, efficiency, safety, and

environmental goals.

We accomplish this by:

• Listeningandunderstanding.

• Providingaflexibleapproach

to problem solving.

• Developingcreativeand

innovative solutions.

• Partneringwithclientsto

implement these solutions.

We commit ourselves to

creating a challenging and

supportive work environment

that fosters opportunity for

professional growth and

fulfillment.

Our team is dedicated to

the highest standards of

professional ethics and integrity.

R E C E I V E OU R Newsle t te r by E-mai lThis Newsletter, No. 39, Spring 2012, is again being sent by e-mail to our contacts for whom we have an e-mail address.Itwillalsobesentviaregularpostalservice.Wearecontinuallyexpandingtheelectronicdistributionlistfor our bi-annual newsletter.

To receive this and upcoming Newsletters electronically, you may directly sign-up through the link on our website (http://jansenboiler.com/publications/newsletters/) or alternatively, send your e-mail address to [email protected] and you will be included on the list.

Participants take notes during a past Biomass Boiler Workshop

ATTEND OUR 2012 Biomass Boiler Workshops •Minneapolis,Minnesota,May10-11,2012 •Savannah,Georgia,September20-21,2012Since 2000, these workshops have been attended by some 750 representatives of numerous plants in the Pulp/Forest Products Industries, Independent Power Producers and Energy-from-Waste Industry.

Theworkshopsconsistofpresentationsaboutnewtechnologicaldevelopmentsandresultstoimprovetheoperatingperformance,wastefuelburningcapacity,efficiency,andfueleconomyofbiomass-firedboilers(mostlystoker-fired).Inaddition,theprogramwillincludetroubleshootingandproblemsolvingdiscussionsofchallengesthatattendeesbringtotheworkshop.Participantswillbenefitby:1)learningaboutthecurrentretrofittechnologyforbiomassboilersandassociatedequipment;2)seeinghowothermilloperationssolvetheirbiomassboilerareaproblems;and3)receivinginformationandsolutionstotheirspecificproblems.Atten-dancetotheworkshopisfreeofcharge;spaceislimited.

The workshops are co-sponsored by:

For sign-up and to receive a detailed program of the technical presentations, workshop location, and hotel, etc., please contact PatAzeltineorCathyThomasbyphoneat425.952.2843/[email protected].

Inquiries should be directed to:

Editor, Boiler News JansenCombustionandBoilerTechnologies,Inc.12025115thAvenueNE,Suite250Kirkland,WA98034-6943

Phone:(425)825-0500 Fax:(425)825-1131E-mail:[email protected]

BoilerNewsispublishedtwiceayearbyJansenCombustionandBoilerTechnologies,Inc.toprovideinformationtoOwnersandOperatorsofboilers.

Reproductionoftheinformationcontainedinthisnewsletterisonlyallowedwithproperreferencetothesource.

Recovery Boiler Capacity Upgrades and NOx Reduction

– Jansen Awarded UpgradesMill conversions to dissolving grade pulp production often necessitate recovery boiler combustion system modifications to increase the boiler’s solids burning capacity while at the same time reducing NOx emissions.

Inrecentyears,consumerproductmarkettrendsinthePulp&PaperIndustryareincreasinglyfavoringdissolvingpulpgradeproducts.Tomeetmarketdemandfortheseproducts,severalmillsareintheprocessof“retooling”thepulpinglinefromproducingconventionalkraftpulptodissolvinggradepulp.Typically,thischangeinproductleadstoincreasedquantitiesofblackliquordrysolids(BLDS)generatedwithpotentiallyhigherheatingvalues.Becauseofthehigherheatinputratetotherecoveryfurnaceandpotentialincreaseinfuelnitrogencontent,generationofNOxwouldbeexpectedtoincrease,therebyleadingtohigherstackemissionrates.

Toimprovetherecoveryboiler’sBLDSthroughputcapacityandoffsetpotentialincreasesinNOx,optimizationoftheexistingcombustionairdeliverysystemisneededandfurtherstagingofcombustionairsupplycanbeappliedbyaddingafourthlevelofair.Intheindustry,thisfourthlevelofairisnamedquaternaryair(QA)andhasbeenshowntoreduceNOxemissions.

Boiler MACT & CISWI Rulings – Another UpdateIn our previous Newsletter one year ago, we reported thattheEPAhadissued“final”BoilerMACTandCISWIrulingsinMarch2011afterafifteen(15)monthexten-sion request was denied by court order. These rulings, however,werenotconsideredfinalbytheEPAduetoanumber of unresolved issues and the acknowledgement that their formulation had been rushed. The rulings wereaccompaniedbyanoticethattheEPAintendedtoreconsider the rules.

TheEPAissuedaDelayNoticeinMay2011tosuspendtheeffectivedatesforBoilerMACTandCISWI.AnamendedsetofBoilerMACTandCISWIruleswerere-proposedinDecember2011andwasopenedupforcommentwiththeintentofbeingfinal-izedinApril2012.Shortlyafterreleasingtheseamendedrulings,acourtordervacatedtheDelayNotice,causingtheMarch2011rulingstobeputintoeffect.TheEPAthenissueda“noaction”letterthatassertedits“enforcementdiscretion”tonotholdindustrialboileroperatorstotheMarch2011rules.

Meanwhile,theEPAhascontinuedtoreviewindustrycommentsandavailabledatatoyetagainrevisetherulingsforafinaltime.The“final-final”rulingsareexpectedsome-timeinApril2012,aroundpresstimeofthisNewsletterissue.Whethertheserulingswillbeacceptedbythecourtorbebroughtunderfurtherchallengethroughlitigationremainstobeseen.

NO Distribution in the FurnaceContinuedfrompage1

BoilerMACT&CISWIRulings

TheDecember2011re-proposedBoilerMACTrulingsincludedseveralchanges.Someofthemoreimportantchangesincluded:

• Workpracticestandardsinplaceofnumericallimitsfordioxins/furans.• Theadditionofmoreboilerdesignandfuelsubcategoriesthatcoverawiderrangeofconditions.Forexample,

thereisnowastokerboilersubcategoryforkiln-driedbiomass.• AlternativeuseofaCOCEMS(10-dayrollingaverage)inplaceofannualstacktests.• Revisionstosomeoftheemissionslimits.Forexample,COemissionsforexistingbiomassstokerboilerswas

raisedfrom490ppm,dry@3%O2,to790ppm,dry@3%O2,whentestedannually;althoughtheCOCEMSlimitwassetlowerat410ppm,dry@3%O2.

• PMCEMSisnolongerrequiredforbiomassunits.• TherequirementthatanO2trimsystembeinserviceforCOcontrolwhennotusingaCOCEMSwasadded.

TheCISWIrulingswerealsore-proposedinDecember2011.InadditiontolimitsforfilterablePM,CO,Hg,andHCl,likethosecontainedinBoilerMACT,theCISWIrulesalsohavelimitsforNOx,SO2,Cd,Pb,anddioxins/furans.ManybiomassboilersarefacedwiththepossibilityofbeingclassifiedasCISWIunitsbecausetheyfirealternativefuelsalongwithbiomass(suchasOCCrejectsorconstruction/demolishdebristhatcancontainplastics).

BesidestheconfusiongeneratedbythechangingBoilerMACTandCISWIrulingsandimplementationperiods,boilerowners/operatorshavebeenchallengedtounderstandtheirboilers’emissionsprofilesandcombustioncharacteristics.JANSENhasbeenassistingclientswithdetermininghowtheBoilerMACTandCISWIregulationswillimpacttheiroperationsandprovidesolutionsforunitsthatwouldexceedthenewlimits.

How Jansen Can Help?

Jansenassistsboilerowners/operatorstodeterminehowBoilerMACT(GACTorCISWI)regulationsimpacttheirboilerandprovideanevaluationoftheboiler’scombustioncharacteristics,includingtuningoptions.Ifoperationalimprovementsarenotsufficienttomeetthenewemissionsrequirements,Jansencanprovidecombustionsystemupgradesandteamwithpollutioncontrolequipmentproviderstohelpcomplywiththenewregulations.

Forfurtherinformationandspecificinquiries,pleasecontactJohnLaFondat425.952.2832orArieVerloopat425.952.2825orby [email protected].

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Sinceourlastnewsletter(No.38,Spring2011),Jansenhasconductedthefollowingprocessanddesign engineeringprojectsintheForestProducts,IndependentPowerProducers,Energy-from-Waste,andother industries(manyprojectsareinprogress):

• CombustionsystemupgradesforbiomassandRDF-fueledboilers.• RecoveryboilerupgradesforincreasedcapacityandNOxreduction.• Superheater,economizer,andtubularairheaterupgradesand/ornewsupply.• BiomassandMSWboilersengineeringevaluations.• Chemicalrecoveryboilerperformanceevaluationsandcapacitystudies.• Boilercirculationstudies.• Definitionengineeringoffluidizedbedboilerbiomasscapacityupgrade.• Conversionstudyofrecoveryboilertobiomassfiring.• CFDmodelingofbiomass,chemicalrecovery,MSW,andRDF-fueledboilers.• Boileroperationalfine-tuningandoptimizationsupport.• BoilerMACT,GACT,andCISWIcompliancereviewandoperationaltuning.

This work was conducted, or is currently in progress for the following companies:

NEWSBriefs

Forfurtherinformationonthesetypesofprojects,pleasecontactArieVerloopat425.952.2825orbye-mailat arie.verloop@jansenboiler.com.Additionalinformationandspecificprojectreferencescanbefoundonourwebsiteat: www.jansenboiler.com.

• AsiaPacificResourcesInternational• AvistaUtilities• BahiaSpecialtyCellulose• Boise• BP-HuskyRefiningLLC• BrunswickCelluloseInc.• BTGSlovakiaa.s.• CaracolKnits• CatalystPapers• ClearwaterPaper• CovantaEnergy

• DominionVirginiaPower• DomtarInc.• FMCCorporation• Georgia-PacificLLC• HeritageWaste-to-Energy• InternationalPaperCompany• LongviewFibre• Louisiana-PacificCorporation• MeadWestvaco• MinnesotaPower• NewPageCorporation

• PackagingCorporationofAmerica• RayonierPerformanceFibersLLC• ReEnergyHoldingsLLC• RockTenn• SAPPINorthAmerica• SonocoProductsCo.• Tembec• VeoliaES• WheelabratorTechnologies,Inc.• WeyerhaeuserCompany

Jansen ProjectsinCanadaInCanada,thedepartmentofNaturalResourceshasimplementedthePulpandPaperGreenTransformationProgram(GTP);atotalofCAD$1billionhasbeenmadeavailabletomillsforcapitalprojectsthathaveapositiveimpactontheenvironment,energyefficiency,andexpandeduseofrenewablefuels.

Thispastyear,JansencompletedseveralprojectsthatweresupportedbytheGTPinmillsinKamloops,PortAlberni,PrinceGeorge,Quesnel(allBC),andWindsor(QUE).

A N N O U N C E M E N T :

Jansen Co-hosts Boiler Workshop in PragueIncooperationwithPowerSpecialistsAssoc.Inc.(PSA)ofSomers,Connecticut,Jansenisco-sponsoringatwo-dayBoilerWorkshopinJuneinPrague,CzechRepublic.TheworkshopwillconsistofpresentationsaboutPowerandRecoveryBoilerAuditPractices,ProtocolsandAnalyticalTools.TheworkshopisfreeofchargeandallpresentationswillbeinEnglish.

Detailedinformationandaregistrationlinkcanfoundathttp://workshop.psaengineering.eu.TheworkshopwillbeheldJune28-29,2012indowntownPrague.

Customized

Engine

Solutions

www.jan

senboile

Visit Jansen’s Booth at Upcoming Conference Trade ShowsJansenwillagainbepresentatseveralupcomingindustryconferencetradeshowsandexhibitions.

• FromApril16-19wewillbeattheInternational Biomass Conference and ExpoattheColoradoConventionCenter,Denver,Colorado.

• Oneweeklater,fromApril23-25,wewillbeatthe20thAnnualNorthAmericanWaste-to-Energy Confer-ence(NAWTEC)inPortland,Maine.

• OnJune13-15,wewillbeatthe5thInternational Bioenergy Conference and ExhibitiontobeheldintheCivicCentre,PrinceGeorge,BritishColumbia,Canada.

Ifyouhappentoattendanyoftheseconferences,docomevisitus!

Boiler House Cartoons on Jansen WebsiteAcollectionofboilerhousecartoonscanbeviewedonourwebsite:www.jansenboiler.com.OverthirtycartoonsbyGordonStevensshownpreviouslyinthisnewsletterarepresentedonthesite.Eachcartoondepictsahumoroussituationwithpeopleandequipmentintheboilerhouse.Asyouwillagree,Gordhastherareinsighttofindhumorintheoperationofpowerandrecoveryboilersandwehopeyouenjoyhiscartoonsasmuchaswedo.

ElementsofOverfireAirSupplyUpgrades

Jansen W E l C O M E SRoger lawton.WearepleasedtoannouncethatRogerLawtonhasjoinedJansen,startinginlateFebruary2012.RogerwillbeworkingoutoftheAtlantaareaasaSeniorConsultant.

Rogerhasover35yearsexperienceinprojecttechnical,engineering,management,andbusinessdevelopmentwithboilersinindustrialandutilityplants.HisprioremployersincludeABBCombustionEngineering,TampellaPowerCorp.,AhlstromCorp.andlastlyAnthony-RossCompany,asVice-PresidentSales.

HehasbroadexperienceindesignandoperationofChemicalRecoveryandBiomassBoilers,particularlyintheareasofcombustionandoperationalperformance.Hisinterestsalsohaveastrongfocusoncustomerrelationsanddevelopinginternationalmarkets.HeholdsaBSinCivilEngineeringandaMBAinFinance,bothattheUniversityofConnecticut.

SomeofyoumayknowRogerbecauseofhisparticipationinBLRBAC,TAPPI,andtheInternationalChemicalRecoveryConference,etc.

Rogercanbereachedbyphoneat:(425)736-0172ore-mail:[email protected],dodrophimaline!

Moriel Arango.WearealsopleasedtoannouncethatMorielArangohasjoinedJanseninNovember2011.Earlierthatyear,MorielgraduatedfromtheUniversityofWashingtonwithaMSdegreeinMechanicalEngineering.AtUW,hewasagraduateresearchassistantfortheLaboratoryforEnergyandEnvironmentalCombustionwhereheresearchedtheimplementationof“in-stream”energyconversiondevices.

Morielisapassionateoutdoorenthusiastincludingrockclimbing,alpinemountaineering,backpackingandwildernessmedicine.Hehasbeenaprofessionalsnowsportsinstructor,andenjoysscubadiving.Also,heisaDSHScertifiedindependentSpanishlanguageinterpreter/translatorformedical,socialandlegalservices.

MorielisworkingasaProcessEngineerinJansen’sProcessTechnologiesdepartment.Hecanbereachedbyphoneat:(425)952-2830ore-mail:[email protected].

www.jansenboiler.com

UPDATE ONBiomass Boiler Combustion System UpgradesSincethelate1990s,Jansenhasdesignedandsuppliedcombustionsystemupgradesonover65solidbiomass andRDF-fueledboilers.Currently,projectsareunderwayforseveraladditionalunits,withplannedinstallationslater this year.

Typically,acombustionsystemupgradeincludesmodi-ficationstothebiomassfueland/orairdeliverysystems,particularlythefueldeliverydistributorsandoverfireair(OFA)supply,asdepictedinthesketchesontheright.

JansenOFAsystemupgradeshaveprovidedsignificantreductioninCOemissions(reductionsbymorethanhalf)thusprovidinganexcellenttoolformeetingBoilerMACTrequirements.

FurtherdetailedinformationoftheJansenapproachandexperienceinupgradingcombustionsystemsofbiomass-firedboilers,includingOFAupgrades,canbefoundonourupdatedwebsite(www.jansenboiler.com)withdetailedprojectdescriptionsandpastNewsletterarticles.

ReadersmaywishtoattendoneofJansen’sBiomassBoilerWorkshops.Ashasbeenatraditionforovertenyears,biomassboilerworkshopswillbeheldintwolocationsin2012:Minneapolis,Minnesota(May10-11)andSavannah,Georgia(September20-21).Forsign-updetailsandfurtherinformationabouttheseworkshopsandlocations,seetheannouncementonpage6.

Forspecificinquiriesand/orreferences,pleasecontactArieVerloopat425.952.2825,orNedDyeat425.952.2827orbye-mailatfirstname.lastname@jansenboiler.com.

ElementsofFuelDistributorUpgrades

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RecoveryBoilerCapacityUpgradesandNOx Reduction

Atseveralmills,JansenwascontractedtoconductevaluationsofrecoveryboilerBLDSburningcapacityandasso-ciatedNOxgenerationbeforeandaftermakingthechangefromkrafttodissolvingpulp.Thisevaluationtypicallyconsistsofasitevisitforfirst-handcollectionofoperatingdata,followedbyprocessevaluationsandmassandheatbalancecalculations.AnimportantelementoftheevaluationprocessisComputationalFluidDynamics(CFD)modelingofthefurnacecombustionconditionswiththedifferentBLDSsupplyratesandheatingvalues.CFDmodelingistypicallyconductedforseveralconfigurationsofcombustionairsupplyandattheconclusion,apara-metricevaluationofkeyperformancefactorsprovidesvaluableinputtotheengineeringdesignoftheairsystemmodifications.Theendresultisanairsystemthatbestmeetstheclient’sneeds.

AnexampleofCFDmodelingresultsisshowninthesketchonpageone.ThefurnaceismodeledwithoutQA(ontheleft),thentwodifferentelevationsofQAaremodeled.ANOxreductionby27%ispredictedbythemodelsbetweennoQAandQAatahigherelevation(atright).

JansenhassuccessfullyCFDmodeledrecoveryandbiomassboileroperationforover20years.Themodelingisconductedin-housebyexperiencedJansenpersonnel,underthedirectionofDr.AllanWalsh.AttheannualRecoveryBoilerCommitteeConferenceoftheAmericanForest&PaperAssociation(AF&PA),heldinAtlantathisFebruary,Dr.Walshmadeapresentationtitled“AnImprovedMethodforModelingNOxEmissionsfromRecoveryBoilers”.ThepresentationevaluatedseveraldifferentNOxmodelingmechanismsandtheirrespectivecomplexitiesinpredictingNOxgenerationfromcombustionofblackliquorinrecoveryboilers.

AftercompletingtheboilercapacityandNOxevaluationsreferencedabove,Jansensubmittedproposalsforthedesignandsupplyfortheupgradesoftheboilers’combustionairsystems.Oftheseproposals,upgradeprojectswererecentlyawardedtoJansen,withproposalsforadditionalunitsunderreviewbyclientsatpresstime.Wewillkeepyoupostedonactualupgraderesultsinlaternewsletters.

Forgeneralinformationorspecificinquiries,pleasecontactArieVerloopat425.952.2825,orJohnLaFondat425.952.2832orbye-mailatfirstname.lastname@jansenboiler.com.

ChangingoftheGuardatJansenSince September 2011, John La Fond is President

JohnF.LaFond,P.E.tookoverthepositionofPresidentfromEdward“Ned”C.Dye,P.E.,whohasbeeninthispositionsince1997.UnderNed’sleadership,thecompanyhasexperiencedsignificantgrowthandhassolidifieditsreputationintheevaluationandretrofittingofindustrialboilersintheforestproducts,waste-to-energy,independentpowerproducer,andotherindustries.

JohnreceivedhisundergraduatedegreeinMechanicalEngineeringfromStanfordUniversityandhisMaster’sdegreefromtheUniversityofCalifornia,Berkeley.Since1982,hehasworkedintheareasofcombustion,airpollutioncontrol,energyutilization,boilerdesign,boilerflowmodeling,andprojectmanagement.JohnhashadadistinguishedcareerwithJansensince1989,mostrecentlyasManagerofProcessTechnologies.

NedretainsthepositionofChairmanoftheBoardatJansenandwillbeworkingwithJohninthistransition.Therecentchangeinthecompany’sleadershipisthenextstepinourstrategicplanningtoensurethelongevityofthecompany.Bymakingthisasmoothtransition,thecontinuityofmanagementandexpertiseisguaranteed,whichwillenableJansentocontinuetoprovidequalityservicestoourclients.

John and Ned can be reached at:[email protected],phone:(425)[email protected],phone:(425)952-2827

John F. La Fond, P.E. President

Edward “Ned” C. Dye, P.E. Chairman of the Board

TheEnergy-from-Waste(E-f-W)industryconsistsoffacilitiesthatburnmunicipalsolidwaste(MSW),refusederivedfuel(RDF),constructiondebris(CD),andsometimesbiomassfuelsinordertodisposeofthesewaste materials. Typically, these facilities also convert the heat from waste

fuel combustion to produce steam and generate electrical power.

Inlastyear’sNewsletter(No.38,Spring2011),wereportedonJansenprovidingmechanicaldesignandequipmentsupplyforthecombustionsystemupgrade,includingOFA,ofsix RDF boilers in operation at three different E-f-WfacilitiesintheUS.Foracopyofthatnewsletterandarticle,visithttp://jansenboiler.com/publications/newsletters/.

Atfacility“B”inthearticle,afterthesuccessfulupgradeofoneRDFunit,two(2)additional,identicalRDFunitscontinuedtobeinoperationintheiroriginalconfiguration.Becauseofthesignificantoperationalimprovementsthatwereachievedbythefirstunit,theplantdecidedtohaveJansensupplythecombustionsystemupgradeofthesecondunitaswell.ThisupgradewasinstalledinMarchof2012.

Again,asseenonthefirstunit,significantimprovementsarebeingexperiencedimmediatelyafterstart-up,mainlyinreducingCOandstabilizingoperation.Atpresstimeofthisnewsletter,allindicationsarethattheplantislookingforwardtoJansensupplyingtheupgradeonthethirdandlastunitaswell.

Forfurtherinformationonthisrecentworkandspecificinquiriesaboutpotentialfutureprojects,pleasecontactArieVerloopat425.952.2825orbye-mailatarie.verloop@jansenboiler.com.

Upgrading Additional

RDF Boilers

Customized

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Solutions

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senboile

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RDF Boilers

Customized

Engine

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RDF Boilers

INSIDE THIS ISSUE

OUR MISSION

and services.

to problem solving.

fulfillment.

– Jansen Awarded UpgradesMill conversions to dissolving grade pulp production often necessitate recovery boiler combustion system modifications to increase the boiler’s solids burning capacity while at the same time reducing NOx emissions. Recently, Jansen was awarded several of these capacity upgrade contracts.

Inrecentyears,consumerproductmarkettrendsinthePulp&PaperIndustryareincreasinglyfavoringdissolvingpulpgradeproducts.Tomeetmarketdemandfortheseproducts,severalmillsareintheprocessof“retooling”thepulpinglinefromproducingconventionalkraftpulptodissolvinggradepulp.Typically,thischangeinproductleadstoincreasedquantitiesofblackliquordrysolids(BLDS)generatedwithpotentiallyhigherheat-ingvalues.Becauseofthehigherheatinputratetotherecoveryfurnaceandpotentialincreaseinfuelni-trogencontent,generationofNOxwouldbeexpectedtoincrease,therebyleadingtohigherstackemissionrates.

Toimprovetherecoveryboiler’sBLDSthroughputcapacityandoffsetpo-tentialincreasesinNOx,optimizationoftheexistingcombustionairdeliverysystemisneededandfurtherstagingofcombustionairsupplycanbeappliedbyaddingafourthlevelofair.Intheindustry,thisfourthlevelofairisnamedquaternaryair(QA)andhasbeenshowntoreduceNOxemissions.

Continuedonpage5

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NEWSBriefs

INSIDE THIS ISSUE

OUR MISSION

and services.

to problem solving.

fulfillment.

– Jansen Awarded UpgradesMill conversions to dissolving grade pulp production often necessitate recovery boiler combustion system modifications to increase the boiler’s solids burning capacity while at the same time reducing NOx emissions. Recently, Jansen was awarded several of these capacity upgrade contracts.

Inrecentyears,consumerproductmarkettrendsinthePulp&PaperIndustryareincreasinglyfavoringdissolvingpulpgradeproducts.Tomeetmarketdemandfortheseproducts,severalmillsareintheprocessof“retooling”thepulpinglinefromproducingconventionalkraftpulptodissolvinggradepulp.Typically,thischangeinproductleadstoincreasedquantitiesofblackliquordrysolids(BLDS)generatedwithpotentiallyhigherheat-ingvalues.Becauseofthehigherheatinputratetotherecoveryfurnaceandpotentialincreaseinfuelni-trogencontent,generationofNOxwouldbeexpectedtoincrease,therebyleadingtohigherstackemissionrates.

Toimprovetherecoveryboiler’sBLDSthroughputcapacityandoffsetpo-tentialincreasesinNOx,optimizationoftheexistingcombustionairdeliverysystemisneededandfurtherstagingofcombustionairsupplycanbeappliedbyaddingafourthlevelofair.Intheindustry,thisfourthlevelofairisnamedquaternaryair(QA)andhasbeenshowntoreduceNOxemissions.

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NEWSBriefs

news briefs 2012 biomass boiler workshops boiler news€¦ · combustion system modifications to...

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