Development of a New High-efficiency Dual-cycle Natural Gas Liquefaction Process

Chang Lin, Hong Wang, Gailing Bai, Di Wu

GasTech2017

05 April 2017

Content

Background

Process development and application

Conclusions

Process flow

Industrial application

Specific power

Simulation and optimization

Capacity of LNG train

1

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

2

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.

3

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

4

Process Flow

5

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

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

6

Feed gas

Separator

HHC

LNG

NG

MR1

Cycle

MR2

Cycle

DMR2

Feed gas

HHC

NG

MR2 Cycle

MR1 Cycle

LNG

DMR3

HQC-DMR2

Process Flow

Feed gas

Separator

HHC

LNG

NG

MR1

Cycle

MR2

Cycle

Schematic diagram (Patent No. CN 201110328369.1)

Cold suction

7

Feed gas

HHC

NG

MR2 Cycle

MR1 Cycle

LNG

DMR3

Feed gas

Separator

HHC

LNG

NG

MR1

Cycle

MR2

Cycle

DMR1

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

8

Feed gas

Separator

HHC

LNG

NG

MR1

Cycle

MR2

Cycle

DMR2

Feed gas

Separator

HHC

LNG

NG

MR1

Cycle

MR2

Cycle

DMR1

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.

9

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

10

Shan’dong Tai’an LNG Plant

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.

11

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

12

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

13

ArcticTropicalNTZ

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

14

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

Capacity of LNG Train

Equipment Manufacturing

Ability

Equipments Localized

in China

International

Equipments

~3.0mtpa

6.0mtpa

15

Maximum capacity

MR compressorPFHE

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.

16

Our Team

LNG RECEIVING TERMINALS

JIANGSHU: 6.5MTPADALIAN: 6.0MTPA

TANSHANG: 6.5MTPA

Q & A

Thank you for your attention!

Contact us:

http://www.hqcec.com

Acknowledgement

Email: Zhangyi1757@hqcec.com