CALIFORNIA ENERGY COMMISSION Gas Quality Stakeholders’ Technical Committee Meeting September 20,...
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CALIFORNIA ENERGY COMMISSION Gas Quality Stakeholders’ Technical Committee Meeting September 20, 2005 Natural Gas Quality: Power Turbine Performance During Heat Content Surge Updated Information and Schedule William Walters Aspen Environmental Group Sponsored by the California Energy Commission
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Transcript of CALIFORNIA ENERGY COMMISSION Gas Quality Stakeholders’ Technical Committee Meeting September 20,...
CALIFORNIA ENERGY COMMISSION
Gas Quality Stakeholders’ Technical Committee Meeting
September 20, 2005
Natural Gas Quality:Power Turbine PerformanceDuring Heat Content Surge
Updated Information and Schedule
William WaltersAspen Environmental Group
Sponsored by the California Energy Commission
CALIFORNIA ENERGY COMMISSION
Update and Schedule
• Sutter Natural Gas Fuel Wobbe was determined. Los Medanos, Delta, and Redding as used fuel Wobbe cannot be determined with available data.• Western Midway Sunset had events of reduced fuel heat content which caused significant increases in CO emissions, but did not significantly impact NOx emissions.• Study will go out for CEC management and data provider review later this week, and the Draft Study with excel raw data tables should be made public as early as late next week. • Additional work will be funded by the CEC to determine potential natural gas quality emissions/operations impacts to large power boilers. Scope of work should be completed by the end of this week and work should begin in approximately two weeks.
CALIFORNIA ENERGY COMMISSION
Sutter Natural Gas Fuel Heat Content and Wobbe
960
970
980
990
1000
1010
1020
1030
1040
105012
:00
AM
4:00
AM
8:00
AM
12:0
0 P
M4:
00 P
M8:
00 P
M12
:00
AM
4:00
AM
8:00
AM
12:0
0 P
M4:
00 P
M8:
00 P
M12
:00
AM
4:00
AM
8:00
AM
12:0
0 P
M4:
00 P
M8:
00 P
M12
:00
AM
4:00
AM
8:00
AM
12:0
0 P
M4:
00 P
M8:
00 P
M12
:00
AM
4:00
AM
8:00
AM
12:0
0 P
M4:
00 P
M8:
00 P
M12
:00
AM
4:00
AM
8:00
AM
12:0
0 P
M4:
00 P
M8:
00 P
M
9-Jun-05 10-Jun-05 11-Jun-05 12-Jun-05 13-Jun-05 14-Jun-05
Btu
/scf
(H
HV
)
1290
1300
1310
1320
1330
1340
1350
1360
Wo
bb
e In
dex
Heat Content
Wobbe Index
CALIFORNIA ENERGY COMMISSION
Sutter CT2 Uncontrolled NOx vs Wobbe
1300 1320 1340 1360W obbe Index
20
22
24
26
28
30
Pre
-SC
R N
Ox
(pp
m)
95 percent confidence in terva l
best fit line
95 percent confidence in terva l
CALIFORNIA ENERGY COMMISSION
Sutter CT2 Ammonia Use vs Wobbe
1290 1300 1310 1320 1330 1340 1350W obbe Index
70
80
90
100
110
Am
mo
nia
Inje
ctio
n R
ate
(lb
s/hr
)
95 percent confidence in terva l
95 percent confidence in terva l
best fit line
CALIFORNIA ENERGY COMMISSION
Sutter CT2 Controlled NOx vs. Wobbe
Summary:
• Uncontrolled NOx 15% increase for 3.5% increase in Wobbe
• Ammonia use 10% increase for 3.5% increase in Wobbe
• Controlled NOx no increase
1290 1300 1310 1320 1330 1340 1350W obbe Index
2
2.1
2.2
2.3
2.4
Pos
t-S
CR
NO
x (p
pm
)
best fit line
95 percent confidence lim it
95 percent confidence lim it
CALIFORNIA ENERGY COMMISSION
Western Midway Sunset CO Emissionsvs Fuel Heat Content
0.1
1
10
100
1000 1020 1040 1060 1080 1100 1120
Heat Content (Btu/scf)
Car
bo
n M
on
oxi
de
(pp
m)
Post-Modification COPre-Modification COSecond Turbine CO
CALIFORNIA ENERGY COMMISSION
Western Midway Sunset Description
• Cogeneration 7E turbines with SCR and no CO catalyst – 25 ppm CO permit limit.
• No significant controlled NOx impacts (i.e. reduction) during heat content drop.
• Expensive (~$250,000) burner modification fixed problem.
• Subsequent burner modifications to second turbine affected earlier CO emissions fix.
