by: pankaj shah, chevron (presenter) · pdf file by: , 17th international conference &...

DOC ID © Chevron 2013

<Title of Presentation>

By: <Author Name>, <Organization>

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<Title of Presentation> By: <Author Name>, <Organization>

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17th INTERNATIONAL CONFERENCE & EXHIBITION

ON LIQUEFIED NATURAL GAS (LNG 17)

Refrigeration Compressor Driver Selection and

Technology Qualification Enhances Value for the

Wheatstone Project

By: Pankaj Shah, Chevron (presenter)

Co Authors:

Mark Weatherwax, Chevron

Meredith Chapeaux, Chevron

Karl Masani, ConocoPhillips Company

Cyrus Meher-Homji, Bechtel Corporation

17 April 2013

17th INTERNATIONAL CONFERENCE & EXHIBITION ON

LIQUEFIED NATURAL GAS (LNG 17)

© Chevron 2013

Topics

• Project background

• Driver alternatives

• Driver selection

• Technology qualification

• Conclusions

2


Project background

© Chevron 2013 4

Wheatstone Project

2.0 BCFD Processing Platform

73m water depth 2x4.45 MMTPA LNG Trains

0.2 BCFD Domestic Gas Plant

44” Export Pipeline

225 km to Plant

0.4 BCFD Subsea Wells & Facilities

(Apache / Kufpec)

1.6 BCFD Subsea

Wells & Facilities

(Chevron / Shell)

Barrow Island

Subsea Centre

WA-356-P

WA-356-P

WA-253-P

WA-17-R

WA-16-R

© Chevron 2013

Plant location

5

• Ashburton North Strategic Industrial Area

• Located about 12 km SW of Onslow

Population about 450, increasing to 650 in winter

Primary industries agriculture (sheep), salt (Onslow Salt) and fishing

© Chevron 2013

Onshore facilities

• 2 x 4.45 mtpa LNG trains; Condensate and

domestic gas production

• ConocoPhillips Optimized Cascade® process

• Modular construction strategy

• 2x150,000 cum FC LNG tanks

• USD 29 billion

investment

• Planned expansion

to 25 mtpa of LNG

6


Driver alternatives

© Chevron 2013

Evolution of drivers in LNG industry

8

© Chevron 2013

First application of gas turbines

9

Kenai LNG – First Application of Gas Turbines in LNG Service (1969)

© Chevron 2013

First application of LM2500 Aero Derivative Turbines

10

Darwin LNG – First Application of LM2500 Aero Derivative Turbines in LNG Service (2006)


Driver selection

© Chevron 2013

Project specific factors influencing driver selection

12

Key project specific factors influencing driver study

Fixed feed stream flow limiting ability to utilize

excess driver power

Compositional uncertainty with regards to feed

stream nitrogen content requiring flexibility with

available power

Site ambient conditions; ambient temperature

ranging from 13oC to 40oC (extremes 5oC to 47oC)

Other criteria for selection include emissions, total

installed cost, LNG Production, operating cost,

technical/operational/schedule risk, etc

© Chevron 2013

Driver study alternatives

i. 6 x LM2500+G4 with mechanical refrigeration for

inlet air chilling (IAC)

ii. 6 x LM2500+G4 with Inlet Air Humidification

(IAH)

iii. 7 x LM2500+G4 with no power augmentation

iv. 6 x LM6000PF with IAH

v. 7 x LM2500+G4 with IAH

vi. 7 x LM2500+G4 with IAH and HRSG and steam

turbine power generation

vii. 2 x Frame 7EA and 2 x Frame 5D

13

© Chevron 2013

1300

1400

1500

1600

1700

1800

1900

7000 7050 7100 7150 7200 7250 7300 7350 7400 7450 7500

vii

vi

viii

iv

i

ii Discounted Prof itability Index X

Net P

resent

Valu

e

Present Value of Capital Expenditure

Discounted Prof itability Index Y

Alternative Description

i 6xLM2500+G4 with IAC

ii 6xLM2500+G4 with IAHIII 7xLM2500+G4 with no augmentationiv 6xLM6000PF with IAH

v 7xLM2500+G4 with IAHvi 7xLM2500+G4 with IAH and Steam Cyclevii 2xFrame 7EA

Selected driver – LM6000PF

• 6 x LM6000PF with IAH was the selected based on

a combination of low TIC, attractive NPV and DPI

• Technical risk managed via a technology

qualification plan

14


Technical qualification

© Chevron 2013

• Formal methodology and toolbox of resources

• Joint effort between Chevron, Bechtel, GE and CoP

• Identified systems/sub-systems for qualification

• LM6000 TQP completed in December 2009

Chevron Technology Qualification Process

16

© Chevron 2013

Major TQP Activities/Findings

• Dynamic Simulations

Train shut-down and startup simulation by Bechtel

The compressor train takes over 20 seconds to decelerate to approximately 1800 rpm

LM6000PF engine simulation during train shut-down by GE using their engine simulator

Gas turbine can stop in less than 5 seconds without stall occurring within the axial turbine.

• Compressor selections for the base case design operating conditions

• Compressor capable of full pressure restart

• Train Torsional Analysis for the Methane compressor train

17


Conclusion

© Chevron 2013

Technology Qualification Conclusions

All major TQP risks and open action items

have been addressed and closed

Design review

Modeling and Simulations

Quality control/inspections

Testing at Supplier Facilities

Field inspection and testing

Gas Turbine Performance Testing

Full load string testing

LM6000PF – acceptable mechanical drive

option for Wheatstone

19

© Chevron 2013

Ambient temperature impact on gas turbine performance

Power augmentation

is essential

21

0%

5%

10%

15%

20%

25%

30%

Lapse Rate - Avg Amb. To Ext High Amb.

Gas Turbine Lapse Rate (Avg Ambient to Extreme High Ambient)

LM6000PF

LM6000PF w/Evap Cooler

PGT25+G4

Frame 6B

Frame 7EA

© Chevron 2013

High ambient temperature operation options

• Overfiring of gas turbines

• High purity refrigerant propane

• Add sprint to propane LM6000 gas turbine

• Inlet mechanical chillers

• LiBr chiller package

• Helper motor for propane compressor gas turbine

• Compressor impellor technology with higher

turndown capability

22

by: pankaj shah, chevron (presenter) · pdf file by: , 17th international conference &...

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