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Development of a New High-efficiency Dual-cycle Natural Gas Liquefaction Process
Chang Lin, Hong Wang, Gailing Bai, Di Wu
GasTech2017
05 April 2017
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Content
Background
Process development and application
Conclusions
Process flow
Industrial application
Specific power
Simulation and optimization
Capacity of LNG train
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Background
1953 1983 1993 2005
HQC Introduction
Consultation, R&D, engineering, procurement, construction, commissioning
and start-up
Completed over 2,000 large scale projects
Covers petrochemical, coal chemical, oil refining, LNG and new energy, etc.
One of the world's largest 225 contractors and the world's largest 200
design companies (ENR).
Affiliated to CNPC
Found
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Background
Cryogenic Business
Conventional business
air separation
liquid nitrogen washing
low temperature methanol washing
low temperature hydrocarbon separation in ethylene complex
New launched business since the end of last century
liquefied hydrocarbon storage (LPG LEG LNG)
engineering design and construct LNG terminals.
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Background
Rich engineering experience & relevant cryogenic technology
CNPC development strategy planning
HQC-DMR proposed and put into industrial applications successfully
Passed technical evaluation and project acceptance, Aug. 2012
Technology development of natural gas liquefaction
Existing process
investigation
Process
innovationIndustrialization
Equipment
localization
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Process Flow
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HQC-DMR1
Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
Feed gas
HHC
NG
MR2 Cycle
MR1 Cycle
LNG
HQC-DMR2 HQC-DMR3
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Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
Schematic diagram (Patent No. CN 201110326703.X)
Process Flow
HQC-DMR1
Both MRs outflow from the warm end of cold box
warm suction
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Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
DMR2
Feed gas
HHC
NG
MR2 Cycle
MR1 Cycle
LNG
DMR3
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HQC-DMR2
Process Flow
Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
Schematic diagram (Patent No. CN 201110328369.1)
Cold suction
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Feed gas
HHC
NG
MR2 Cycle
MR1 Cycle
LNG
DMR3
Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
DMR1
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HQC-DMR3
Process Flow
Feed gas
HHC
NG
MR2 Cycle
MR1 Cycle
LNG
Schematic diagram (Patent No. CN 201110328354.5)
Cold suction
Two pressure level
V/L separate
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Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
DMR2
Feed gas
Separator
HHC
LNG
NG
MR1
Cycle
MR2
Cycle
DMR1
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Industry Application
Shan’xi An’sai LNG plant
First Plant
Capacity: 0.5mtpa
Construction: 2010~2012
Start up: Aug. 2012
Configuration: single LNG train
one storage tank
Process: HQC-DMR1
Upon its completion,
it was the largest LNG Plant in China.
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Industry Application
Capacity: 0.6mtpa
Design & Construction:
Aug. 2011~ Oct. 2013
Start up: Aug. 2014
Configuration:
single LNG train
one storage tank
Process: HQC-DMR3
Equipment: Localized
Sketch map
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Shan’dong Tai’an LNG Plant
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Reference list
Industry Application
Project Train Capacity Work scope Completion time
An’sai LNG project 0.5mtpa EPC 2012.08
Tai’an LNG project 0.6mtpa EPC 2014.08
PDP-1(tropical desert climate)
2.6mtpa PD 2012.04
PDP-2(arctic climate)
5.5mtpa PD 2016.01
Ji’gang LNG project 0.5mtpa FSR 2012.05
Canada Woodfiber LNG Project 2x1.05mtpa CD 2013.12
Djibouti LNG Project 2.7mtpa Pre-FEED 2014.08
Two research projects of FLNG are underway.
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Specific Power
Process type HQC-DMR SMR C3MR Cascade
Specific power
kW/TPD
13.6~12.3 15.4~13.0 13.8~12.9 ~13.0
Remark HQC-DMR1,2&3 1~3 pressure
levels
3~4 pressure
levels for pre-
cooling
Optimized
Home study of process comparison, based on the same conditions and assumptions
Several flow structures had been studied for each type of process.
PDP-12.6mtpa
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Specific Power
Projects Tai’An LNG PDP-1 PDP-2
Environmental
Capacity, mtpa 0.6 2.6 5.5
Feed gas
composition,
mol%
Methane:
Nitrogen:
Others:
95%
1%
4%
88%
4%
8%
94%
1%
5%
Feed gas input pressure,
MPaG
5.5 6.0 6.67
Specific power, kW/TPD 13.1 12.3 11.6
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ArcticTropicalNTZ
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Simulation and Optimization
Traditional method Proposed method
Based on GA
Multi-variables synchronous optimization
Global search
Increase optimization efficiency
Evaluation Simulation
GAGenetic
Algorithm
HYSYS
Partial optimization, maybe fail to find the global optimal solution
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Power = f (TAMB, P, F, Ci-MR,TLNG…… )
Energy reduced by ~6.4%
Simulation: HYSYS, PROII
Based on gradient information of objective function
Equations: SQP
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Capacity of LNG Train
Equipment Manufacturing
Ability
Equipments Localized
in China
International
Equipments
~3.0mtpa
6.0mtpa
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Maximum capacity
MR compressorPFHE
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Conclusions
HQC-DMR is a proven technology with two projects industrialized. It has a
compact configuration, low energy consumption, good reliability and
operability.
HQC-DMR is suitable for medium and large scaled LNG plant. Based on the
present equipment manufacturing ability, train size can be reached to 6.0mtpa.
Optimization method based on GA was developed. Appropriate process flow
structure and tailor-made mixed refrigerant composition will be provided for
different projects.
HQC-DMR is expected to be applied in floating facilities.
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Our Team
LNG RECEIVING TERMINALS
JIANGSHU: 6.5MTPADALIAN: 6.0MTPA
TANSHANG: 6.5MTPA
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Q & A
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Thank you for your attention!
Contact us:
http://www.hqcec.com
Acknowledgement
Email: [email protected]