In-line BOG Recondenser

November, 2017
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In-line BOG Recondenser

Amazing Size !
Conventional

Newly Developed(Packed-Bed Type)(Static-Mixer Type)c

Volume: Minus 98%
Weight: Minus 93%

Length: 9,000 mm

Length: 3,000 mm

Diameter: 1,600 mm

Diameter: 300 mm

Weight: 10.0 ton

Weight: 1.0 ton

Note: Assuming BOG Recondensing Capacity 14 t/h
Copyright 2017 © JFE Engineering Corporation All Rights Reserved

2In-line BOG Recondenser
The Shocking size !
Newly Developed
Static Mixer Type

Copyright 2017 © JFE Engineering Corporation All Rights Reserved3In-line BOG Recondenser

Unique and Innovative
This unique and innovative recondensing process, developed by JFE,
materializes such a extraordinary small BOG recondenser.

Our proprietary internals convert BOG
in very fine bubbles and let thempenetrate into subcooled LNG.

The internals also make the LNG flow
more turbulent, which enhances themixture of BOG and LNG.

The fine bubbles maximize the surface
area of BOG, which accelerates heattransfer between BOG and LNG.

The BOG bubbles are immediately dispersed and recondensed.
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In-line BOG Recondenser

TechnologyDevelopment
First Commercial
Plant
Laboratory Test by water-steam system (2013)• Identified the parameters affecting therecondensing performance• Found the best internal design to maximize
the performance• Created the preliminary design guideline

Recondenser

Pilot Test by LNG-BOG system (2014)• 1/15 scale test at an existing LNG receiving terminal• Conducted numerous tests to evaluate the risks
against safe and stable operation of the wholerecondensing system• Verified the recondensing performance is close tothe theoretical limit(*)• Demonstrated the device is applicable tothe BOG from US shale gas

Pilot Plant(*) Theoretical limit
The minimum ratio of LNG/BOG mass flowrate
where all BOG can be recondensed completelyassuming 100% heat exchange efficiency.

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In-line BOG Recondenser

First Commercial Plant• Re-verified the recondensing performance(no issue for scale-up from the 1/15 pilot plant)• Demonstrated stable operation in commercial stage• Established the design guideline (Trade Secret)
Location
Owner : Toho Gas Co., Ltd.
Location : Chita-Midorihama,
Aichi, JapanIn operation since April, 2016

Specification
Design Pressure 2.2 MPaG
BOG Flowrate 13t/h at 40℃
LNG Flowrate 155t/h at ‐154℃
Whole BOG Recondensing System

BOG Recondenser

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In-line BOG Recondenser

Super Performance
Design Target

 Challenged the limit
The recondensing
performance is very close to
the theoretical limit(*)
 Minimize Pressure Drop
Small pressure dropenhances the utilization ofthe LNG sensible heat,
which boosts therecondensing capacity.
(*) Theoretical limit
The minimum ratio of LNG/BOG mass flowrate
where all BOG can be recondensed completelyassuming 100% heat exchange efficiency.

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In-line BOG Recondenser
FirstCommercial
SafeOperationwithPlant
Low Operational Complexity• LNG flowrate to the recondenser isHigh-Pressure
BOGCompressor
kept constant at a set value. The value
is reduced only when the regas rate is
Mini Flow to LNG tanklower than the initial set value.
Low-Pressure
BOG Compressor• BOG flow is controlled below its max.
allowable flowrate (‘MABF’) to prevent
BOG carry-over at the recondenser.
MABF is calculated by JFE’s proprietarycontrol system.

• Excess BOG is sent to a pipeline byHP BOG compressor when BOG flowrate
is larger than MABF.

BOG Flowmeter

BOG Recondensing SystemVapor Detection
SystemFIn-line BOG
Recondenser

LNG Vaporizer
FP• Vapor Detection System stops the 2nd’ry
Primary Pump
pump when it detects BOG carry-over.

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Secondary Pump

8

In-line BOG Recondenser
First Commercial
ComplexCalculationPlant
without Process Simulator
LNG Regasification Rate①
LNG Flow Control（FLC）
Process Data(P, TG, TL)

BOG Compressor
Flowrate Control(*) MABF : Max. allowable BOG flowrate
BOG Flowmeter

High-Pressure
BOG Compressor

LNG
CompositionCalculate
Max. Allowable
BOG Flowrate

JFE’s proprietary control system calculates
MABF(*) without process simulator.
BOG Recondensing System

Mini Flow to LNG tank

Low-Pressure
BOG Compressor

Vapor Detection
SystemF②In-line BOG
Recondenser

LNG Vaporizer③FP

Control Sequence
Primary Pump
Secondary Pump
① Adjust LNG flowrate at the recondenser based on the LNG Regasification rate.
② Calculate the max. allowable BOG rate from the process data and LNG composition.
③ Avoid excessive BOG comes into the rencondenser
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9In-line BOG Recondenser

Significant Reduction of Power Consumption
Achieved 50% reduction in power consumption at BOG processing system in thefirst commercial plant

10080Reduced

Power Consumption
(%)

9070
60
50403020
100

Before introducing BOG
Recondensing System

After introducing BOG
Recondensing System

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10In-line BOG Recondenser

Tiny Mighty
 Saving Space, CAPEX and OPEX
 Minimizing pressure drop
 Safe operation with low operational complexity
 Simulating process without a simulator
 Reducing power consumption

Copyright 2017 © JFE Engineering Corporation All Rights Reserved

11In-line BOG Recondenser

JFE will provide;• In-line BOG Recondenser,• Control System installed in PLC, and• Licensed Engineering Package.
(PFD, P&ID, Control Philosophy, O&M Manual, etc.)

Please contact us for any enquiries.
Strategic International Business Development
Energy Industries Engineering Sector, JFE Engineering Corporation
Tel: +81-45-505-7247, Fax: +81-45-505-7571, Email: sibd@jfe-eng.co.jp
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