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Particulate Matter Seminar

Particulate Matter Seminar. John Kush Texas Genco Rice University Shell Center for Sustainability November 9, 2004. Who is Texas Genco?. Texas Genco Formerly HL&P/Reliant Energy power plants 11 facilities in TX; using natural gas, oil, coal, lignite and uranium fuels

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Particulate Matter Seminar

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  1. Particulate Matter Seminar John Kush Texas Genco Rice University Shell Center for Sustainability November 9, 2004

  2. Who is Texas Genco? • Texas Genco • Formerly HL&P/Reliant Energy power plants • 11 facilities in TX; using natural gas, oil, coal, lignite and uranium fuels • 14,400 megawatts total, 12,000 in Houston area • Created as result of Texas electric power industry restructuring • Currently a subsidiary of CenterPoint Energy; sale to GC Power Acquisition, LLC in progress

  3. W. A. Parish Station

  4. W. A. Parish Unit Information

  5. W. A. Parish Coal Facts • Coal Supply and Delivery • Low sulfur western coal from the Powder River Basin in Wyoming • Delivery by rail car • Approx. 27,000 tons burned per day • Approx. 10 million tons burned per year Arch Coal, Inc. Black Thunder Mine

  6. W. A. Parish Station • Emission Control Equipment • Baghouse systems for particulate control • Low sulfur coal (plus flue gas desulfurization system (FGD) on Unit 8) • Combustion modifications for NOx control on gas-fired Units 1-4 • Low NOx burner/overfire air systems on Units 5-8 • Selective catalytic reduction (SCR) systems installed on Units 5-8 (planned for Unit 4)

  7. Baghouse systems for fly ash removal Utilize fiberglass bags to trap fly ash >99.9% removal efficiency Original equipment on Unit 8; retrofit in 1988-89 on Units 5-7 to replace electrostatic precipitators W. A. Parish Emission Control Equipment Unit 5 Baghouse contains ~15,000 bags

  8. Flue Gas desulfurization system (FGD) for SO2 removal on Unit 8 Spray tower design Limestone slurry reagent SO2 removal of ~80% W. A. Parish Emission Control Equipment Unit 8 FGD System

  9. W.A. Parish Coal Combustion Product Management • Ash Uses • 73% of CCPs are sold • 90% of all fly ash • 100% of all FGD material • 25% of all bottom ash • CCPs are utilized as a concrete additive, stabilization and road base/foundation materials • Ash Disposal • Ash is classified as Class II non-hazardous waste • Ash disposal in two on-site 30-acre industrial landfills. Design includes clay liner, cap, and groundwater monitoring

  10. Advanced LNB/OFA systems installed on all coal units 1st commercial installation of B&W LNBs on Unit 6 1st commercial installation of Alstom LNB/OFA system guaranteed to meet 0.15 lb/MMBtu on WAP 7 50%-60% NOx reductions achieved W. A. Parish NOx Control Equipment

  11. W. A. Parish SCR Construction

  12. W. A. Parish Emission Control Equipment Coal unit SCR's • Vanadium-titanium catalyst • Aqueous NH3 reagent • 80-85% reduction to meet 0.03 lb/MMBtu • All 4 SCRs operational by Spring, 2004

  13. The Steady Downward March of NOx Emission Rates

  14. Texas Genco Emission Reduction Results • W.A. Parish Emission Reductions • Unit 8 SO2 emissions reduced by ~80% (FGD system) • Coal-unit particulate emissions reduced by >99.9% (Baghouse system) • Coal-unit NOx emissions reduced by ~90% (LNB/OFA + SCR systems) • The Texas Genco system operates with one of the lowest NOx production rates in U.S. • W. A. Parish coal units are now likely the lowest NOx emitting coal units in the nation.

  15. Questions and Answers

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