Particulate Matter Seminar

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Particulate Matter Seminar
John Kush Texas Genco Rice University Shell
Center for Sustainability November 9, 2004
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Who is Texas Genco?

• Texas Genco
• Formerly HLP/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

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W. A. Parish Station
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W. A. Parish Unit Information
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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
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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)

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W. A. Parish Emission Control Equipment

• Baghouse systems for fly ash removal
• Utilize fiberglass bags to trap fly ash
• gt99.9 removal efficiency
• Original equipment on Unit 8 retrofit in 1988-89
  on Units 5-7 to replace electrostatic
  precipitators

Unit 5 Baghouse contains 15,000 bags

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W. A. Parish Emission Control Equipment

• Flue Gas desulfurization system (FGD) for SO2
  removal on Unit 8
• Spray tower design
• Limestone slurry reagent
• SO2 removal of 80

Unit 8 FGD System
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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

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W. A. Parish NOx Control Equipment

• Advanced LNB/OFA systems installed on all coal
  units
• 1st commercial installation of BW 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

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W. A. Parish SCR Construction
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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

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The Steady Downward March of NOx Emission Rates
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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 gt99.9
  (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.

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Questions and Answers