Meeting Multiple Challenges: Re-Rating W. A. Parish Unit 8
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1 Meeting Multiple Challenges: Re-Rating W. A. Parish Unit 8 NOx and Performance Improvements at a 650 MW coal-fired electric generating unit Derek Furstenwerth Manager, Air Resources Division, Environmental Department Reliant Energy
2 Who Are Reliant Energy and Texas Genco? Reliant Energy Top 10 Generator of Electricity in US 21,000 megawatts Operates in 13 states Also provides support to Texas Genco Texas Genco Former HL&P power plants 14,400 megawatts total, 12,000 in Houston area Created as result of Texas Electric Power Industry Restructuring Subsidiary of CenterPoint Energy, Reliant to purchase in 2004
3 W. A. Parish Station Description Located on a 4880 acre site near Thompsons, Tx Four gas-fired and four coal-fired steam generators, plus a 13 MW gas turbine generator. Total gross capacity of over 3800 MW (largest fossil plant in U.S.) Approximately 360 employees
4 W. A. Parish Station
5 W. A. Parish Unit Information Unit MW Year Primary Fuel Gas Gas Gas Gas Coal Coal Coal Coal GT Gas
6 W. A. Parish Unit 8 Emission Control Equipment Baghouse system for particulate control Low sulfur coal plus flue gas desulfurization system (FGD) Low NOx burner/overfire air system Selective catalytic reduction (SCR) systems under construction
7 What are the Challenges Facing W. A. Parish? Houston-Galveston SIP Lowest Coal Unit NOx limits in nation Cap-and-trade program Restructured Texas Electric Market
8 Why Re-rate? Restructured Texas Electric Market Economics based on production Production dispatched based on lowest cost W. A. Parish is low-cost power plant New Opportunities Improved materials Better efficiencies
9 Challenges to Re-rating or Why doesn t everyone? New Source Review BACT More emission controls Nonattainment NSR LAER, offsets The Steady Downward March of NOx NSPS, RACT, SIP Limits Area-wide NOx reductions 88% reduction by 2004 More emission controls» Meeting Multiple Challenges - One stone, two birds
10 The Steady Downward March of NOx WAP 5 8 Coal Fired Regulatory NO X Limits W A Parish Coal Unit Regulatory NO X Limits NOx NOx lb/mmbtu lb/mmbtu WAP WAP Permits (1977) (1979) Current 2002 WAP W A Parish Operating NOx Levels Emissions ( ) (0.155) WAP NOx 8RACT NOx EPA RACT NSPS EPA TCEQ NSPS TNRCC SIP WAP SIP SCR Permit (1999) (1979) (1999) (1998) (1998) (2004) (2004) Design Regulatory Regulatory Limits Limits
11 Meeting Multiple Challenges Re-rating Unit 8 Increase Production Capacity 10% Increase from 590 to 650 MW Improved efficiency New Source Review No significant increase in NOx, SO2, or VOC due to emission controls No NSR or NSPS PSD for CO, PM10, H2SO4 and Fluoride Existing equipment determined to represent BACT SIP Compliance SCR under construction Operational by end of 2003 Lowest NOx coal plant in country
12 W. A. Parish Emission Control Equipment Baghouse systems for fly ash removal Utilize fiberglass bags to trap fly ash >99.9% removal efficiency Unit 5 Baghouse contains ~15,000 bags
13 W. A. Parish Emission Control Equipment Flue Gas desulfurization system (FGD) for SO2 removal on Unit 8 Unit 8 FGD System Spray tower design Limestone slurry reagent SO2 removal of ~80%
14 W. A. Parish Emission Control Equipment NOx Reduction Advanced LNB/OFA systems installed on all coal units 1 st commercial installation of Alstom LNB/OFA system guaranteed to meet 0.15 lb/mmbtu 50%-60% NOx reductions achieved
15 W. A. Parish Emission Control Equipment Low NOx design of the Unit 7 & 8 TFS 2000 System Air injected in the burnout zone Fuel and air injected in the combustion zone
16 P2 tm Coal LNB Nozzle Tip
17 LNB Installation
18 W. A. Parish Emission Control Equipment Coal unit SCR's under construction Vanadiumtitanium catalyst Aqueous NH3 reagent 80-85% reduction to meet 0.03 lb/mmbtu W. A. Parish Unit 8 SCR Retrofit SCR Boiler Fabric Filter FGD
19 Texas Coal-fired Unit NOx Rates (2001) NOx Rate (lb/mmbtu) Pirkey 1 Limestone 1 San Miguel 1 Welsh 2 Sam Seymour 3 Big Brown 2 Sam Seymour 2 Sandow 4 Sam Seymour 1 Harrington Station 1 Monticello 1 Oklaunion 1 Harrington Station 1 Martin Lake 1 Tolk Station 1 Monticello 2 Tolk Station 2 Martin Lake 3 Welsh 1 Coleto Creek 1 Harrington Station 3 Big Brown 1 Limestone 2 Gibbons Creek 1 J T Deely 1 J T Deely 2 Monticello 3 TNP 2 Martin Lake 2 Welsh 3 TNP 1 W A Parish 5 W A Parish 6 J K Spruce 1 W A Parish 8 W A Parish 7 WAP SCR Design
20 W. A. Parish Unit 6 SCR Construction (May, 2000)
21 W. A. Parish Unit 6 SCR Construction (July, 2002)
22 W. A. Parish Unit 5 SCR Construction (July, 2002)
23 W.A.Parish Unit 8 SCR Construction (April, 2001)
24 W. A. Parish Unit 6 Catalyst Loading (July, 2002)
25 W. A. Parish Unit 6 Catalyst Loading
26 W. A. Parish Ammonia Tank Farm
27 W. A. Parish Unit 6 NH3 Injection Nozzles
28 W. A. Parish Unit 6 NH3 Mixer
29 Meeting Multiple Challenges Review Increased Production Capacity 10% Increase from 590 to 650 MW Improved efficiency Reduced Emissions SCR under construction Cleanest coal plant in country NOx to 0.03 lb/mmbtu design value
30 Questions and Answers
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