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Air Pollution Control Considerations for Biomass Firing of Existing And WPCA/FirstEnergy Biomass Seminar Akron, Ohio December 3, 2009 All presentations posted on this website are copyrighted by the Worldwide Pollution Control Association (WPCA). Any unauthorized downloading, attempts to modify or to incorporate into other presentations, link to other websites, or obtain copies for any other uses than the training of attendees to WPCA Conferences is expressively prohib- ited, unless approved in writing by the WPCA or the original presenter. The WPCA does not assume any liability for the accuracy or contents of any materials contained in this library which were presented and/or created by persons who were not employ- ees of the WPCA. SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution ControlControl ConsiderationsConsiderations forfor BiomassBiomass FiringFiring ofof ExistingExisting andand NewNew BoilersBoilers 1 SOUTHERN environmental INC. Air Pollution Control Systems PhotosynthesisPhotosynthesis (Nature(Nature’’ss SolarSolar StorageStorage Battery)Battery) CO2 + 2H2O + photons = (CH2O)n + H2O + O2 Carbon Dioxide + water + light energy = carbohydrate + oxygen + water Cellular metabolism converts simple sugars into cellulose, lignin, oils, etc. 2 SOUTHERN environmental INC. Air Pollution Control Systems CombustionCombustion –– ExtractingExtracting thethe StoredStored EnergyEnergy (CH2O)n + O2 + heat = CO2 + H2O + HeatHeat Carbohydrate + Oxygen + heat = Carbon Dioxide + Water + HeatHeat 3 SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution fromfrom BiomassBiomass CombustionCombustion SourcesSources 4 SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution fromfrom BiomassBiomass CombustionCombustion SourcesSources SOSOX –– typicallytypically notnot aa significantsignificant sourcesource S in fuel – 0.0-0.1% (Unless sulfur containing additives) Stoker type boilers < 0.03 lb/mmBtu SO2 (typical) 5 SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution fromfrom BiomassBiomass CombustionCombustion SourcesSources NONOX 2 primary ways NOx is formed in industrial-scale combustion processes: – Oxidation of the Nitrogen in the fuel – Oxidation of the N2 in the combustion air – 2800 degF and higher Typically, not a significant source – Fuel content typically <0.5% – Lower combustion temperatures Stoker type boilers , 0.05 lb/mmBtu – NO2 (typical) 6 SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution fromfrom BiomassBiomass CombustionCombustion SourcesSources ¾¾COCO && VOCVOC –– PrimarilyPrimarily functionsfunctions ofof boilerboiler designdesign && operationoperation 7 SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution fromfrom BiomassBiomass CombustionCombustion SourcesSources ParticulatesParticulates ¾¾ 11--5%5% ashash content;content; lessless thanthan coalcoal ¾¾LowerLower BtuBtu contentcontent thanthan coalcoal duedue toto moisturemoisture 8 SOUTHERN environmental INC. Air Pollution Control Systems AirAir PollutionPollution fromfrom BiomassBiomass CombustionCombustion SourcesSources ¾¾ParticulateParticulate EmissionsEmissions fromfrom biomassbiomass combustioncombustion sourcessources Stoker Fired – high LOI, embers Fluidized – low LOI, possible high grain loading due to media carry-over Wall fired – generally co-fired with fossil fuels; fossil emissions dominate 9 SOUTHERN environmental INC. Air Pollution Control Systems AshAsh CharacteristicsCharacteristics ofof WoodWood BasedBased FuelsFuels ¾ Light and Flaky ¾ Low Resistivity ¾ High LOI – up to 75%, 20-40% typical (N/A fluidized bed) ¾ Can have high silica content (sand from logging, transport, & storage) ¾ Can have high sodium or potassium salts content (log transportation in brackish or saltwater) ¾ Can have high phosphorus content (fertilizer or phosphate soils) 10 SOUTHERN environmental INC. Air Pollution Control Systems AshAsh CharacteristicsCharacteristics ofof WoodWood BasedBased FuelsFuels SEM Image of K295-15-5 11 SOUTHERN environmental INC. Air Pollution Control Systems AshAsh CharacteristicsCharacteristics ofof WoodWood BasedBased FuelsFuels SEM Image of Coal Flyash 12 SOUTHERN environmental INC. Air Pollution Control Systems ExistingExisting ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass MechanicalMechanical CollectorCollector (Cyclone,(Cyclone, MultiMulti--clone)clone) Moderate Pressure Drop Suitable for >10.0 micron particles Excellent as spark arrestor 13 SOUTHERN environmental INC. Air Pollution Control Systems ExistingExisting ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass WetWet ScrubberScrubber High Pressure Drop Suitable for >2.5 micron particles Requires water treatment system Not susceptible to fires 14 SOUTHERN environmental INC. Air Pollution Control Systems ExistingExisting ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass FabricFabric FilterFilter (Baghouse)(Baghouse) Moderate to High Pressure Drop Suitable for sub-micron particles Temperature limited <400degF Susceptible to pinhole leaks Susceptible to fires (Stoker) Best suited for fluidized bed boilers 15 SOUTHERN environmental INC. Air Pollution Control Systems ExistingExisting ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass DryDry ElectrostaticElectrostatic PrecipitatorPrecipitator Low Pressure Drop Suitable for sub-micron particles Suitable for all types of boilers Susceptible to fires (O2 should be <6%) Typically used with multi- clone for spark arrest 16 SOUTHERN environmental INC. Air Pollution Control Systems ExistingExisting ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass WetWet ESPESP Moderate Pressure Drop (when combined with scrubber or saturator) Suitable for sub-micron particles Requires saturated flue gas (wet scrubber or saturator) Requires water treatment system Materials of Construction - $$$ 17 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass NewNew techniquestechniques areare beingbeing appliedapplied toto thethe existingexisting ParticulateParticulate ControlControl DevicesDevices toto greatlygreatly improveimprove theirtheir performanceperformance 18 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass NewNew techniquestechniques forfor DryDry ESPESP’’ss Rigid Discharge Electrodes ¾SEI/ELEX RS opposed & staggered • VI characteristics tailored to each field 19 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass NewNew technologiestechnologies forfor DryDry ESPESP’’ss (cont.)(cont.) Switch-Mode Power Supplies – Micro-second vs. milli-second response – 3-5% ripple vs. 35-45% – Up to 30% better performance compared to conventional TR set. – Smaller, lighter vs. TR set – 3-ph with 0.94 pf vs. 1-ph with 0.63 pf = energy savings 20 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass NewNew techniquestechniques forfor DryDry ESPESP’’ss (cont.)(cont.) Wide Collecting Electrode spacing (16” +) Greater clearances = higher field voltages = higher corona currents (charging) = higher power = higher collection efficiency Marriage of the 3 previously mentioned “new” Dry ESP technologies results in a synergy that provides performance comparable to fabric filter without the associated O&M costs 21 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass ¾¾NewNew technologiestechnologies forfor WetWet ESPESP’’ss Switch-Mode Power Supplies Polymer Membrane Collecting Electrodes – Corrosion-proof polypropylene felt – Continuous flushing – Less $ than metal CE’s Super-aggressive Rigid Discharge Electrodes 22 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass 23 SOUTHERN environmental INC. Air Pollution Control Systems NewNew ParticulateParticulate ControlControl TechnologiesTechnologies forfor BiomassBiomass 24 SOUTHERN environmental INC. Air Pollution Control Systems ConclusionsConclusions ¾¾AirAir PollutionPollution ControlControl cannotcannot bebe anan afterthought,afterthought, butbut mustmust bebe anan integralintegral partpart ofof thethe BiomassBiomass decisiondecision--makingmaking processprocess ¾¾WhenWhen decidingdeciding onon whichwhich APCAPC technologytechnology toto use,use, thethe latestlatest provenproven techniquestechniques ofof eacheach shouldshould bebe consideredconsidered –– possiblypossibly aa combinationcombination ofof technologiestechnologies 25.
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