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2006 Gasification Technologies Conference
Comparison of IGCC Air Emissions vs.
a Conventional Coal Plant
Robynn AndracsekBurns & McDonnell
2006 Gasification Technologies Conference
The objective is to be objective.
(Just the facts, ma’am)
2006 Gasification Technologies Conference
Agenda
• Actual Emissions Data – SO2, NOX, CO2
• Permitted Emissions – SO2, NOX, PM10, CO
(CO2 is not currently permitted)• Mercury• Control Devices• Trends
2006 Gasification Technologies Conference
Actual Emissions Data
2006 Gasification Technologies Conference
Plants in OperationThe specific PC and CFB plants were chosen
since they were the most recent ones with several years of operating data available.
E Bit/pet coke
PRB
PRB
Bit/pet coke
Bit/pet coke
Fuel
4/02-6/06
4/03-6/06
8/01-6/06
1/01-6/06
1/01-6/06
Data Range
265FLJEA 1 and 2CFB
80WYWygen 1 (Black Hills)PC
570MOHawthorn 5PC
250FLTECO PolkIGCC
262INWabashIGCC
MWStateNameType
2006 Gasification Technologies Conference
EPA’s Acid Rain Database
• Clean Air Markets - Data and Maps – http://cfpub.epa.gov/gdm/index.cfm– Emissions Prepackaged Data Sets
• Hourly Data – Only “Boiler operating days” were used– “24-hour period during which fossil fuel is
combusted in a steam-generating unit for the entire 24 hours”
– Applicable to units operating before 2005
2006 Gasification Technologies Conference
-
0.100
0.200
0.300
0.400
0.500
0.600
0.700
Qualified Operating Hours
lb/M
MB
tu
SO2 30 Day Rolling Average•Variability of fuel sulfur content•Effect of time to recover from startup/ shutdown/ upsets•No distinct differences
CFBIGCCPC
2006 Gasification Technologies Conference
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
Q ualified O perating Hours
lb/M
MB
tu
NOx 30 Day Rolling Average•Variability in early life as plants are commissioned•Lines converge as plants age
CFBIGCCPC
SCR
2006 Gasification Technologies Conference
0.070
0.080
0.090
0.100
0.110
0.120
0.130
0.140
Qualified Operating Hours
lb/M
MB
tu
CO2 30 Day Rolling Average
•Values are calculated, not measured•Data is suspect:
•Tight grouping between plant types •Lack of noise
CFBIGCCPC
2006 Gasification Technologies Conference
Statistics
0.103 0.093 0.137Hawthorn 50.103 0.119 0.116Wygen 10.125 0.085 0.153Polk0.121 0.1290.228Wabash0.106 0.067 0.162JEA20.105 0.066 0.231JEA1
CO2lb/MMBtu
NOxlb/MMBtu
SO2lb/MMBtuFacility
Average
•Reflect compliance with limits, not best achievable rates
2006 Gasification Technologies Conference
Permitted Levels
(including levels in the applicationif the permit is not yet issued)
2006 Gasification Technologies Conference
Plants in this Review - IGCC
• Wabash • Polk • Kentucky Pioneer • Lima• Elm Road
• Taylorville• Cash Creek• Mesaba• Stanton
2006 Gasification Technologies Conference
Plants in this Review - CFB
• Red Hills • AES Puerto Rico • JEA Northside• North Hampton• Seward - Repowering• EnviroPower - KMP• Southern Illinois Coop. • Alcoa - Sandow 5 - #1,2• Indeck-Elwood,IL• Estill County Energy• Hugh L. Spurlock (#3)
• Sevier Power • Beach Hollow (Robinson
Power)• Gascoyne • Greene Energy Resource• Formosa Plastics (TX)• Bonanza Power Plant• South Heart Power Project• River Hill Waste Coal• Rodemacher (Unit 3)• Western Greenbrier• Highwood Generating
2006 Gasification Technologies Conference
Plants in this Review - PC
• Black Hills• Hawthorn #5• Weston Bend • Mustang• Baldwin Expansion • Tucson - Springerville• Rocky Mountain Power• Thoroughbred• Holcomb #2• Prairie Energy Power Plant• Roundup Power (Bull
Mountain)
• Plum Point Power Station• Hunter Power Plant (# 4)• Two Elk• MidAmerican #4• Elm Road• Cross Generating Station - #
3 & 4• Whelan Energy Center • Longview Power • Intermountain Power - #3• Weston 4 • Southwest Power Station -#2
2006 Gasification Technologies Conference
Plants in this Review – PC (cont)
• Longleaf Energy-PRB• Longleaf Energy-Central
Appalachian • Prairie State• Nebraska City # 2• TS Power Plant (Newmont)• Twin Oaks (Sempra Energy)• Comanche Plant (Unit #3)• WYGEN II• Oak Grove, TX• Hugo (# 2)• Big Cajun II #4• Trimble County
• J.K. Spruce Plant - # 2• Sandy Creek Energy • Cliffside - # 6 & 7• Iatan (# 2)• Holcomb Station (# 2-4)• Dallman - #4 • Big Stone II• Palatka (# 3)• TXU 8 Pack • AMP Generating Station• Desert Rock• Dallman - #4
2006 Gasification Technologies Conference
SO2 Comparison•Fuel sulfur variability•IGCC trends lower
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1992 1994 1996 1998 2000 2002 2004 2006 2008
Year
lb/M
MB
tu
CFB
PC
IGCC
Year of Application/Permit
2006 Gasification Technologies Conference
NOx Comparison•Similar limits between all plant types•Slight downward trend
0
0.05
0.1
0.15
0.2
0.25
1992 1994 1996 1998 2000 2002 2004 2006 2008
Year
lb/M
MB
tu
CFBPCIGCC
Year of Application/Permit
2006 Gasification Technologies Conference
0
0.01
0.02
0.03
0.04
0.05
0.06
1992 1994 1996 1998 2000 2002 2004 2006 2008
Year
lb/M
MB
tu
CFBPCIGCC
PM10 Comparison• Mix of “filterable only” and “filterable plus condensible” limits• Upward trend reflects concerns about “condensible” test methods•IGCC trends lower
Year of Application/Permit
2006 Gasification Technologies Conference
0
0.05
0.1
0.15
0.2
0.25
0.3
1992 1994 1996 1998 2000 2002 2004 2006 2008
Year
lb/M
MB
tu
CFBPCIGCC
CO Comparison (not CO2)•Variability reflects lack of emphasis on CO•IGCC trends lowest
Year of Application/Permit
2006 Gasification Technologies Conference
Mercury
Clean Air Mercury Rule• Makes comparisons of Hg limits before
and after the rule moot• Note the redefinition of “wet” and “dry”
2006 Gasification Technologies Conference
Clean Air Mercury Rule
2“Wet” and “Dry”refer to 30-yr average rainfall
Subcategory Final[1] Re-Proposed[2]
Bituminous Coal 21 x 10-6 20 x 10-6
Subbituminous Coal "Wet" 42 x 10-6 66 x 10-6
"Dry" 78 x 10-6 97 x 10-6
Lignite 145 x 10-6 175 x 10-6
Coal Refuse 1.4 x 10-6 1.0 x 10-6
IGCC 20 x 10-6 20 x 10-6
Emission Limit (lb/MWh)
1“Wet” and “Dry”refer to Flue Gas Desulfurization technology used
DRY WET
2006 Gasification Technologies Conference
Control Devices
2006 Gasification Technologies Conference
0
10
20
30
40
50
CC DI
LNB NH3 R
ecOFA SCR SISNCR
# of
Uni
ts
CFBIGCCPC
NOx
CC - Combustion Control DI - Diluent Injection LNB - Low NOx Burners NH3 Rec - Ammonia RecoveryOFA - Over Fired Air SCR - Selective Catalytic Reduction SI- Steam Injection SNCR - Selective Non Catalytic Reduction
2006 Gasification Technologies Conference
0
2
4
6
8
10
ACI DSI MRS
# of
Uni
ts
CFBIGCCPC
MercuryACI - Activated Carbon Injection DSI - Dry Sorbent Injection MRS - Mercury Removal System
2006 Gasification Technologies Conference
0
5
10
15
20
25
30
35
40
45
ESP FF or BH PFS WESP
# of
Uni
ts
CFBIGCCPC
PM10
ESP - Electrostatic Precipitator FF or BH - Fabric Filter or Bag House PFS - Particulate Filtration System WESP - Wet Electrostatic Precipitator
2006 Gasification Technologies Conference
0
5
10
15
20
25
30
AGR
FDA
HARSDA/D
FGD/CDS
SRS
WFGD
# of
Uni
ts
CFBIGCCPC
SO2AGR - Acid Gas Removal FDA- Flash Dryer
Absorber HAR- Hydrated Ash
Reinjection (Polishing Scrubber)
SDA-Spray Dry Absorber/ DFGD-Dry Flue Gas
Desulfurization/CDS-Cent. Dry Scrubber SRS - Sulfur Removal
System (SO2 & H2SO4) WFGD - Wet Flue Gas
Desulfurization
2006 Gasification Technologies Conference
Trends
• More applications each year• Boiler operating day (NSPS Subpart Da)
– Redefined for units after February 28, 2005 – “24-hour period…during which any fuel is combusted
at any time in the steam-generating unit”– Makes before and after comparisons unequal
• Next generation of plants – Permitted rates are lower– Not yet in operation
• In the future, will CO2 be measured instead of calculated?
2006 Gasification Technologies Conference
Thank you.
2006 Gasification Technologies Conference
Acronyms
• CFB-circulated fluidized bed• CO-carbon monoxide• CO2-carbon dioxide• Hg-mercury• IGCC-integrated gasification combined cycle • NOx-nitrogen oxides• NSPS-New Source Performance Standards• PC-pulverized coal• PM10-particulate matter less than 10 microns in diameter• SO2-sulfur dioxide
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