An Introduction to Gas Turbines – Fuel Flexibility · 2016-11-16 · Siemens gas turbine models...
Transcript of An Introduction to Gas Turbines – Fuel Flexibility · 2016-11-16 · Siemens gas turbine models...
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An Introduction to Gas Turbines – Fuel Flexibility
Richard Williamson, Geraldine Roy, Siemens Ind.Turbomachinery Ltd.
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RW GR / PG DG 2
• Introduction 3 • Gas Turbine portfolio 4 • Gas Turbine design 6 • Gas Fuel Flexibility in DLE 16 • Gas Fuel Contaminants 24 • Liquid Fuel Challenges 28 • Summary 34
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First established in 1857 - Joseph Ruston Gas Turbines since 1946 - Frank Whittle
Gas Turbines
Agriculture
Military Transport
Industry
Gas Turbine heritage
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Gas turbine portfolio
SGT-500 (19/19 MW) SGT-600 (24/25 MW) Industrial RB211 (27 to32/28 to 34 MW) SGT-700 (33/34 MW) SGT-750 (38/39 MW) SGT-800 (48 to 53 MW) Industrial Trent 60 (53 to 66/54 to 62 MW)
Industrial 501 (4 to 6 MW) SGT-100 (5/6 MW) SGT-200 (7/8 MW) SGT-300 (8/8 MW) SGT-400 (13 to 14/13 to 15 MW)
SGT6-2000E (116 MW) SGT6-5000F (242 MW) SGT6-8000H (296 MW)
SGT5-2000E (187 MW) SGT5-4000F (307 MW) SGT5-8000H (400 MW)
50 Hz
60 Hz
50 or 60 Hz
Gas turbines in the range of
0-15 MW
Gas turbines in the range of
16-99 MW
Gas turbines in the range of
100-400 MW
Aeroderivative gas turbines
Industrial
gas turbines
Heavy-duty
gas turbines
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World class innovative solutions with strong footprint in all industries
Chemicals Pulp & Paper
Manufacturing Food & Beverage, etc.
Electric Power Utility Independent Power
Producer Municipality
Installed fleet [units] ~ 1,700 ~ 950
Industrial Power Generation
Up-Stream Mid-Stream
Down-Stream
Oil & Gas
~ 1,400
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Gas Turbine package design
Gas and Liquid Fuels
Combustion Air
Exhaust Gas
The fluids entering or exiting the gas turbine core or package influence both turbine performance and environmental impact
• Fuel contamination
• Exhaust Pollutants
Wet Abatement methods
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Gas Turbine - SGT-400 core engine design
Compressor Combustion system Gas Generator Turbine Power Turbine
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Industrial and Aero-derivative gas turbine combustion
• Originally both diffusion flame design
• Reverse flow / In-line design
• Design Driven by Legislation and company policies in a move to Low Emissions Combustion technologies
• Varying complexity of DLE systems
Combustion systems
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Combustion Mode Operation
PRE - MIX
PRIMARY
DIFFUSION PRE - MIX
LEAN -LEAN SECONDARY PRE - MIX
Lean Pre-mix
Mode switching
Stage combustion
LOAD
Modes of combustion operation(Illustrative purpose only)
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Combustors
Examples of staged, pre-mix annular and pre-mix cannular combustors
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Combustion systems
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Gas Turbine Combustor – Dry Low Emission technology
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• Introduction 3 • Gas Turbine portfolio 4 • Gas Turbine design 6 • Gas Fuel Flexibility 16 • Gas Fuel Contaminants 24 • Liquid Fuel Challenges 28 • Summary 34
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0%
20%
40%
60%
80%
100%vo
l %
Tailgas
Blast furnace
Air blown gasific
ation
Steel process
Syngas / O2 gasific
ation
Wellhead - V
ery High Inert (
50-85%)
Landfill / d
igester / sewage
MCV Refinery
Wellhead - H
igh Inert (
25-50%)
Coke Oven H2 NG
NG with H2
LNG
HCV Refinery
Wellhead - H
igh hydrocarbon
HCV ProcessLPG
CO2N2COH2C3H8C2H6CH4
Fuel Type Various fuel types - Gaseous Fuels
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Gas Fuel Flexibility
• Lean gases have a potential positive impact on gas turbine performance • Rich gases have a slight negative impact
• DLE Combustion systems, offering low emissions, available on most Siemens gas turbine models on a wide range of gas fuels
• Not at present for fuels with high H2 (>15%) and CO content such as syngas or Coke Oven Gas – diffusion flame only
Low Calorrfic Value (LCV) Medium Calorrfic Value (MCV) "Pipeline" Quality High Calorific Value (HCV)
Reference Nat Gas
Siemens Gas Turbine Solution
'Rich'Gas- higher content of C2+ constituents
'Lean' Gas- High Inert content- Coke Oven Gas (COG)- Synthetic Gas (Syngas)
85% Inertcontent gas
50% CH450% N2 'LNG'
100% C3H8COG
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10 20 40 50 60 7030Wobbe Index (MJ/Nm³)
3.5 37 49 65
Low NOx Units operating
Standard DLE fleet Capability
Siemens Diffusion Operating Experience
Air blown Biomass
Gasification Landfill &
Sewage
Gas
High Hydrogen
Refinery Gases
LPG
Off-shore rich gasIPG CeramicsOff-shore lean
Well head gas
Diffusion flame operating units
DLE operating units
Off-shore SE Asia
lean well head gas
Coke oven gas
high Hydrogen
Tri fuel SGT-300
PLG/NG/Liquid
Ethane
Gas Turbines burns a wide range of fuel
Low Calorrfic Value (LCV) Medium Calorrfic Value (MCV) "Pipeline" Quality High Calorific Value (HCV)
Reference Nat Gas
85% Inertcontent gas
50% CH50% N 'LNG'COG
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Alternative Gas Fuels: Case Study 1
University of New Hampshire, USA
• Tri-generation plant to provide power, heat and cooling to University campus
• Low emissions requirement • 15ppm NOx
• Originally envisaged to operate on natural gas with diesel fuel as back-up
• University made aware of availability of local source of landfill gas as low cost fuel
• Gas fuel system able to operate on processed landfill gas as well as natural gas
• Wobbe Index down to 30MJ/Nm3 acceptable • Variable composition as source gases
occasionally blended to boost heating value
Siemens SGT-300 tri-fuel DLE gas turbine
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Ethanol Processing Plant, China
• Process produced waste biogas • 60% methane (CH4) • 36% carbon dioxide (CO2)
• Wobbe Index of 21MJ/Nm3 indicates energy content approximately 50% that of natural gas
• Siemens SGT-400 Dry Low Emissions combustor tested to prove satisfactory operation and start capability
• Biogas fuel only configuration
• Cogeneration plant entered service May 2013
Siemens SGT-400 in operation on a weak gas fuel, China
Alternative Gas Fuels: Case Study 2
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Chemical Plant, China
• SGT-700 gas turbine to operate on process off-gases
• Highly variable composition • High levels C2, C3, C4 encountered • Variable gas composition catered
for in standard DLE combustion hardware
0
25
50
75
100
1 2 3 4 5
CH4C2H6C3H8C4H10H2
Mol %
Selection of Gas samples seen by an SGT-700 over 8 month period
Alternative Gas Fuels: Case Study 3
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Alternative Gas Fuels: Case Study 3
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• Introduction 3 • Gas Turbine portfolio 4 • Gas Turbine design 6 • Gas Fuel Flexibility 16 • Gas Fuel Contaminants 24 • Liquid Fuel Challenges 28 • Summary 34
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Sulphur
Sulphur is a commonly present contaminant
• Gaseous fuels typically as H2S or mercaptans • Liquid fuel as elemental sulphur or mercaptans • Sulphur may also be present in air !
• General observations • H2S is poisonous - even in small quantities • On its own is relatively benign to a turbine combustion
system • ‘What goes in comes out’ • Combusts producing SOx emissions
• SOx is regulated in many parts of the World • In the presence of water can result in the formation of
acids • H2S + O2 + H2O -> H2SO3 or H2SO4 => Acid Rain
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Sulphur
Sulphur reacts with other contaminants to produce corrosive compounds
• Presence of Na + K => sulphates which are highly corrosive to modern turbine materials • Fuel treatment at source may be required • Less corrosive to high chromium content material
• Presence of Va = complex corrosive vanates Combustion chamber inspection after 15000 OH ▪ Partial loss of TBC on inner/outer liner and
on the heat shield
▪ Base material has not been affected
▪ Combustion chamber was changed according to plan
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Fuel Contamination Issues
DLE Combustion Pre-Chamber Failure
• Attributed to hydrocarbon carry-over • Poor control of dew point
DLE Pilot / Main burner with carbon formation • Attributed to hydrocarbon
carry-over
• Poor control of dew point
Main Burner
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• Introduction 3 • Gas Turbine portfolio 4 • Gas Turbine design 6 • Gas Fuel Flexibility 16 • Gas Fuel Contaminants 24 • Liquid Fuel Challenges 28 • Summary 34
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• All models able to operate on high quality liquid fuels such as diesel and kerosene • Emissions abatement available either from “dry” (DLE) or “wet” (WLE) depending on gas
turbine model • SGT-500 able to operate on poor quality liquid fuels such as HFO and crude oil
• Up to kinematic viscosities of around 1000cSt @ 50°C
Liquid Fuel Flexibility
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Liquid Fuel Challenges
Carbon Residue • Carbon Residue is the percentage of coked material remaining after
a sample of fuel has been exposed to high temperatures • Indicates:
• The tendency of fuel to form carbon deposits during combustion • Complexity of hydrocarbon constituents in the fuel • Difficulty in combusting the fuel and time for complete combustion • Affects ability to operate at low loads • Causes Incomplete combustion • Difficult to ignite
• High Carbon Residue content may require start-up on a more conventional fuel
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Liquid Fuel Challenges
Other Contaminants • Alkali metals
• Dissolved in water present in the fuel • Create corrosive constituents during combustion that deposit on hot section components • Can be removed by water washing and centrifuging
• Heavy metals (Vanadium etc) • Dissolved in the oil itself • Create corrosive constituents during combustion that deposit on hot section components • Corrosive effect reduced by chemical dosing (adding magnesium-based inhibitors)
• Water • Free water can lead to corrosion and fuel degradation, and encourage microbial growth that
produces a corrosive slime • Employ proper fuel storage and handling system design
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Liquid Fuel
House keeping / storage
• Quality control procedure • Fuel specification • Cleanliness • Monitoring / recording
• Delivery • Tankers used for same fuel • No cross contamination
• Storage • Receiving and settling tanks • Centrifuge, filter, coalescer fitted to minimise impact of
water and particulate matter
• Forwarding • Day tanks • Fine filtration (polishing) applied to each tank
Property Unit Specification TestMin Max
Cetane Number 52 54 ISO 5165
Density @15°C kg/m3 833 837 ISO 3675
Distillation (vol. % recovered) °C ISO 3405
- 50% point 245 -
- 95% point 345 350
- final boiling point - 370
Flash point °C 55 - EN 22719
CFPP °C - -5 EN 116
Viscosity @40°C mm2/s 2.5 3.5 ISO 3104
Polycyclic aromatic hydrocarbons % wt. 3 6 IP 391, EN 12916
Sulfur contenta mg/kg - 300* ISO/DIS 14596
Copper corrosion - Class 1 ISO 2160
Conradson carbon residue (10% DR) % wt. - 0.2 ISO 10370
Ash content % wt. - 0.01 ISO 6245
Water content % wt. - 0.05 ISO 12937
Neutralization (strong acid) number mg KOH/g
- 0.02 ASTM D974-95
Oxidation stability mg/ml - 0.025 ISO 12205* sulfur limit of 50 mg/kg effective 2005 (Euro 4)a - the actual sulfur content must be reported
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Liquid Fuel Storage
Receiving and settling tanks ▪ Floating Suction
▪ Sloping bottom
▪ Water / Sediment take off-point / drain
▪ Centrifuge, filter, coalescer fitted to minimise impact of water and particulate matter
Settling / Day Tank (if used) ▪ Design as for main tank, including all
best practice features
▪ “Polishing” system comprising aspects such as centrifuge, filter
▪ Polishing applied regularly to ensure water/particulate kept to minimum acceptable level
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• Introduction 3 • Gas Turbine portfolio 4 • Gas Turbine design 6 • Gas Fuel Flexibility 16 • Gas Fuel Contaminants 24 • Liquid Fuel Challenges 28 • Summary 34
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Fuel Contamination Issues
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Fuel Contamination Issues
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Summary
Take a holistic view when understanding the use of gas turbines • Understand all sources likely to
influence GT operation Maximise reliability and availability by working closely with customers • Understand customers needs • Many fuel compositions are possible,
please refer to us for advice. Gas Turbine OEM’s are there to help
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Thank you for your attention !
Richard Williamson Framework ManagerPG DG GCS TIS Ruston House, Waterside SouthLincoln LN5 7FD, United Kingdom Phone: +44 (1522) 584213E-mail: [email protected]
siemens.com/energy