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Presentation Title(Front Cover ver.1)
© 2019 JGC Corporation
Effective Utilization of Boiled Off Gas(BOG) from LNG Receiving
Terminal-MixGen
JGC Technology Forum 2019
3rd July 2019Kenji KawabataSenior Process Department ManagerPT. JGC Indonesia
TM
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CG
Sakai LNG Co/Sakai
Nihon Gas Co/Kagoshima
Oita LNG Co/Oita
Saibugas Co/Nagasaki
Saibugas Co/Fukuoka
Kitakyushu LNG Co/Tobata
Chugoku Electoric Power Co/Yanai
Hiroshima Gas Co/Hatsukaichi
Osaka Gas Co/Himeji
Kansai Electric Power Co/Himeji
Osaka Gas Co/Senboku
Shimizu LNG Co/Sodeshi
Nihonkai LNG/Niigata
Tohoku Electric Power Co/Shin-sendai
Chubu Electric Power Co/Kawagoe
Chubu Electric Power Co/Yokkaichi
Toho Gas Co/Yokkaichi
Toho Gas Co/Chita-midorihama
Chita LNG Co/Chita
Toho Gas Co/Chita CO-OP Terminal
Tokyo Gas Co/Negishi
Tokyo Gas Co/Ohgishima
Tokyo Electric Power Co/Higashi-OhgishimaTokyo Electric Power Co/Sodegaura
Tokyo Gas Co/Sodegaura
Tokyo Electric Power Co/Futtsu
Mizushima LNG Co/Mizushima
Sakaide LNG Co/Sakaide
Chubu Electric Power Co/Joetsu) Hokkaido-Gas Co/Ishikari JX Nippon Oil & Energy Corp/Hachinohe
Saibugas Co/Hibiki(Under Const.)
Inpex Corp/Naoetsu
Gas Bureau, City of Sendai/Sendai
Tokyo Gas Co/Hitachi
Okinawa Electric Power Co/Yoshinoura
50 LNG receiving terminal related
projects in Japan.
LNG Receiving Terminal Excellence
JGC involved project
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What is BOG?
BOG (Boiled Off Gas) is the vapor generated due to the ambient heatinput into a LNG tank.
The composition of BOG is lighter than that of LNG. To maintain the pressure level in the LNG tank, BOG must be released
from the LNG tank.Effective BOG utilization is Key for Optimum LNG Terminal Operation
BOG
LNG Tank
Heat InputHeat Input
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Typical BOG flow
High energy consumption!!
Typical BOG treating in LNG Terminal Pressurization and injection into city gas pipeline Pressurization and utilization as fuel gas for power generation plant Re-liquefied by LNG cold energy
Re-liquefier
BOG
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JGC Proposed BOG FlowJGCʼs patented technology
Re-liquefierBO
G
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Features of GEG Low fuel gas supply pressure (0.5MPag) High efficiency under high temp condition. Enable low loading operation (10〜100%)Maintain higher efficiency even at low
load operation Quick start-up and stoppage operation
(0% to 100% load in appx. 2min)
Fuel Gas composition change resulting in Flame off (GEG Trip)
Key Technology 1- Gas Engine Generator (GEG)Key Technology 1- Gas Engine Generator (GEG)
Issue for power generation by BOG-GEG
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Key Technology 2-Mixing Drum for GEG
Patent pending.Named for a system featuring the MILD mixing of gas in a Drum.
Fuel Gas Mixing Drum developed by JGC with CFD Technology=
40MJ/Nm3
45MJ/Nm3
Pipe
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 2 4 6 8 10 12 14
6000
Calorific value
variatio
n rate [M
J/Nm3/min]
Without MILDrumTM
Max. 6000 MJ/Nm3/min
Calorific value variation rate can be
reduced to 1/6000
Time [min]
With MILDrumTM
Below 1 MJ/Nm3/min
~~
40MJ/Nm3 45MJ/Nm3
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Applicable not only Gas Engine Generator but also Gas TurbineGenerator.
Other fuel gas source like a biogas, LNG and LPG can be applicable. Not limited to LNG receiving terminal project, but any kind of plants.
Other Application for
(GEG or GTG) Electricity and/or Thermal Recovery
Lower Heating Value29.7 MJ/Nm3
Higher Heating Value Gas40.5 MJ/Nm3
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Simple Case Study
38.7MW x 8,000h/year x 6cent /kWh = USD 18.5 mil/year
LNG tank
BOG6.0 [t/h]
BOG Compressor
BOG Gas Engine
Pres. : 0.5 [MPaG]Temp.: 0〜60 [℃]
Electrical Power Output38.7 [MW]
To City Gas
New Income by Electricity Selling
Fuel Gas CompositionLean Rich
BOG*1 [t/h] 6.0 6.0Output [MW] 36.5 38.7
Hot Water [t/h] *2 970 1038Power efficiency 46.9% 47.3%Total efficiency 82.8% 83.7%
*1 Press. 0.5MPaG, Temp. 0〜60℃*2 Press. >0.3MPaG, Temp. 85℃
Hot Water1038 [t/hr]
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Wartsila W18V50SG 18.4MW
Configuration of GEGs ︓ 18.4MW×3 UnitsTotal available Power ︓ 36.8MW (2 running, 1 stand-by)
Main Specifications of GEGCylinders 18
Power Efficiency 50.0%(at 100% load)Engine RPM 500
Frequency(Hz) 50Dimensions(m) 18.8L×4.1W×6.1H
GEG Foot PrintGEG Foot Print 10
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30m
Total available Power ︓ 36.8.MW (2 running, 1 stand-by)
GEG Foot PrintGEG Foot Print 11
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108m
74m
GEG Foot PrintGEG Foot Print
Total available Power ︓ 36.8.MW (2 running, 1 stand-by)
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Study Reference List for Study Reference List for
Client Year Country Power Generation Capacity
Gas Company A 2014 Japan 10-15 MW
Gas Company B 2014 Japan 15MW
Gas Company C 2015 Japan 15MW
Gas Company D 2015 Japan 20MW
Electric Company A 2015 Japan 110MW
Oil & Gas Company A 2016 Japan 1.5 MW
Oil & Gas Company B 2017 Japan 7.8 MW
Gas Company E 2017 South East Asia
NA
Gas Company F 2017 EU 110MW
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Summary
• MixGen is a effective BOG utilization flow.• MixGen consists of 2 key technology components (GEG and Mildrum).• Heating Value Change Rate can be minimized by MilDrum.• LNG Terminal operation cost can be reduced by generating electricity
and heat recovery (steam and/or hot water) by MixGen.
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