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FGD, SCR, & Other Retrofit NOx Controls

FGD, SCR, & Other Retrofit NOx Controls. FGD Retrofit Program. Current Program includes 10 Units Totaling 8400 MWs Construction Timeline is late 2006 through 2010 FGD Limestone Based Technologies include Spray Tower, Spray/Tray Tower and Jet Bubbling Reactor

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FGD, SCR, & Other Retrofit NOx Controls

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  1. FGD, SCR, & Other Retrofit NOx Controls

  2. FGD Retrofit Program • Current Program includes 10 Units Totaling 8400 MWs • Construction Timeline is late 2006 through 2010 • FGD Limestone Based Technologies include Spray Tower, Spray/Tray Tower and Jet Bubbling Reactor • Key Design Parameters and Project Goals • 98% SO2 Removal with 99% Reliability • Fuel Flexibility Sulfur Content Ranges from 2.7% to 4.5% • Disposal and Wallboard Quality Gypsum (site dependent) • Alloy 2205 and 255 Absorber Construction; FRP Internals with Jet Bubbling Reactor • Less than 10 ppm SO3 at Stack Outlet • Convert to Balanced Draft Steam Generator Operation • Limestone Quality from 88 to 95% Calcium Carbonate

  3. FGD Retrofit Program • Additional Design and Equipment Parameters • Single Absorber Module up to 800 MW • SO3 Absorber Capture 30 to 40% • Wastewater Treatment System for Chloride Purge Stream Treatment • Redundant Ball Mills, Spare Vacuum Filters and Recycle Pumps • Saturated Exit gas at 130F • 900ft+ Tall FRP Lined Stacks • Axial Flow ID Fans Up to 19,000 HP • Dry Sorbent Injection for SO3 Control Upstream of Precipitators • 8+ miles of Conveying Systems to Handle 360 tph limestone and 540 tph gypsum

  4. Typical Spray/Tray Tower Module

  5. Typical Jet Bubbling Reactor Flow

  6. Typical Jet Bubbling Reactor Detail

  7. SCR Retrofit Program • Current Program includes 3 Units Totaling 2380 MWs • Construction Timeline is late 2006 through 2009 • Key Design Parameters • 90% NOx Removal Over the Unit Load Range • Inlet NOx Concentration 0.60 lb per 10^6 BTU • 99+ % Reliability • No Reactor Bypass • Static Ammonia Mixers • On Site Ammonia Production • Less 2 ppm Ammonia Slip at 16,000 Service Hours • SO2 to SO3 Conversion of 0.65%

  8. Typical Static Mixing SCR

  9. FGD, SCR and Other Retrofit NOx Controls QUESTIONS????

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