Research Papers: Gas Turbines: Cycle Innovations

Application of Boil Off Gas Compressors in Liquefied Natural Gas Plants

[+] Author and Article Information
Mustapha Chaker, Cyrus B. Meher-Homji, Pradeep Pillai, Dipanjan Bhattacharya, David Messersmith

Bechtel Corporation,
Houston, TX 77056

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 8, 2014; final manuscript received August 15, 2014; published online November 11, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 137(4), 041702 (Apr 01, 2015) (8 pages) Paper No: GTP-14-1474; doi: 10.1115/1.4028576 History: Received August 08, 2014; Revised August 15, 2014; Online November 11, 2014

This paper discusses complexities and challenges of managing boil off gas (BOG) in liquefied natural gas (LNG) liquefaction plants. Most publications in the past have focused on regasification terminals and have not addressed the area of liquefaction plants. The paper discusses the generation and management of BOG and the associated networks and machinery to manage it. BOG options available for both Greenfield plants and in debottlenecking situations are covered. The advantages and disadvantages of different options and compressor systems are covered and the concept of dynamic simulation as an analysis tool is addressed.

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Fig. 1

Large liquefaction single train facility [2]

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Fig. 2

Size of LNG liquefaction plants over time [3]

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Fig. 3

Schematic of the ConocoPhillips Optimized Cascade Process® [2]

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Fig. 4

Generation of BOG within the LNG chain [12]

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Fig. 5

Envelope of varying conditions for different operating scenarios

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Fig. 6

Heat contribution factors generating BOG

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Fig. 7

EcoRel reliquefaction system developed by Cryostar [13]

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Fig. 8

Reciprocating BOG compressor

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Fig. 9

Typical overhung BOG design

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Fig. 10

Between the bearing BOG compressor with variable IGV [14]

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Fig. 11

Flows and pressure ratios (four cases) used for comparisons between compressor types, inlet temperature = −160 °C

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Fig. 12

Discharge temperature comparison between integrally geared and between the bearing designs

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Fig. 13

Power consumed comparison between integrally geared and between the bearing designs

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Fig. 14

Scatter plot showing BOG compressor parameters—power and pressure ratio (land based applications)

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Fig. 15

Scatter plot showing BOG compressor parameters showing inlet temperature and differential pressure (land based applications)

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Fig. 16

Scatter plot showing BOG compressor parameters showing rated power and pressure ratio (land based applications)

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Fig. 17

Scatter plot showing BOG compressor parameters showing rated power and pressure ratio (carrier based applications)

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Fig. 18

Scatter plot showing BOG compressor parameters showing differential pressure and inlet temperature (carrier based applications)

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Fig. 19

Simulation results of the tank pressure change for numbers of compressors [4]

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Fig. 20

ship vapor generation and tank pressure

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Fig. 22

Tank pressure and liquid level simulation

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Fig. 23

Conditions during hold mode

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Fig. 24

BOG flow variation




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