EPA Webinar PresentationAugust 21, 2014Ashdown MillMill History•The mill has been in operation since 1968• No 1 PB in operation since initial start up• No 2 PB installed in 1975•Mill originally owned by Nekoosa Papers•Georgia-Pacific acquired the mill in 1990•Domtar acquired the mill in 2001BART – Technology Assessment•Not technically viable technology– SNCR• Load swings• Adverse environmental factors (ammonia slip/PM2.5formation)– Methane DeNOx• Not used commercially in pulp and paper operations• NCASI reports of operational issues– Other technologies assessed• Not feasible for mill (OFA, FGR, SCR)Comparison Utility/Pulp & Paper MillUtility•Boilers – larger; operatein baseload mode•Steam – one-time passthrough•Monopoly – rate recoveryof costs•Capital equipment – earnmoney through rates•Market conditions –stable trendsPulp & Paper Mill•Boilers – smaller; operate inswing mode for loadtracking•Steam – combined heat andpower•Competitive – global market•Capital equipment – directcost to company•Market conditions – rapidlychangingMill Processes & Products**Steam Generators**•3 Power Boilers & 1 Package Boiler– The pulping and papermaking processes rely oncombined heat and power - power boilers arehere to generate steam based on demand needs of the process– Prior to being sent to the process, steam is sent to TurbineGenerators to generate electricityutilized in the process as well•2 Chemical Recovery Boilers– Reuse and recycle chemicals from the pulping process and to generate steam**Steam Users**•3 Pulping and Bleach Plant lines– 2 Batch Digester lines and 1 Continuous Digester line•3 Paper Machines of various sizes, producing a wide variety of papergrades (1 additional Paper Machine currently idled)– Products primarily include white paper used in a variety of products, such as copy paper, checkpaper, envelope, lollipop stick paper, bag, etc.•1 Pulp Dryer producing market pulp for internal and external salesNo. 1PBNo. 2PBNo. 3PBNo. 2ChemicalRecoveryBoilerTG 1TG 2TG 3TG 4Ashdown Process OverviewSteam Properties:850 psi850 degrees FNo. 4PKGElectrical:InternalGeneration~ 100 MW’sPurchased~40 MW’s160 & 60 psi steam to major usersEvaporatorsBatchDigestersContinuousDigesterPaperMachinesPulpDryer580MMBTU/HR820MMBTU/HRNo. 3ChemicalRecoveryBoilerNo 1 & 2 Power BoilersNo 1 PBWESPStacksNo 2 PBStackVariability of Steam DemandVariability of Steam Demand64 Paper MachineNo 2 PB Steam and 64 PM DemandBatch DigestersNo 2 PB Steam and Digester DemandNo 2 PB Steam and Digester DemandNo. 1 PB WESPVisibility Impact Post- No. 1 PB WESPEmission Unit Class I AreaNumber of Days≥0.5∆dvaMaximum(∆dv)b98th%tile(∆dv)bNo. 1 PowerBoilerCACR00.4760.335UPBU00.0900.038HERC00.0770.020MING00.0600.014No. 2 PB & ScrubberNo. 2 PB & ScrubberNo. 2 PB Plot LayoutBusiness Aspects of Ashdown Mill•Emission control costs are borne directly bythe mill– Competitive global market; restricts pass-through of coststo customers– Unlike regulated utility, which earns money on capitalprojects through rate of return•Markets rapidly changing (digital revolution)– Operational flexibility essential– Adjust to either market demand and/or new productdevelopmentProposed BART Approach•Power Boiler 1– Existing wet ESP•Power Boiler 2– Existing scrubber (SO2)– Low NOx burners (NOx)•Technically feasible options for Ashdown Mill•Economically cost effective•Allow for necessary flexibility in mill operations