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Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
LNG Prigorodnoye Overview
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
METHANE GAS
REFRIGERANTSTORAGE
FRACTIONATION
LPG
SCR
UB
U-1500
E1402
STORAGE & LOADING
STORAGETANK
GAS TREATING –WARM END
CO
2 RE
MO
VA
L
WATER REMOVALHg REMOVAL
E1401
LNG TRAIN 2LNG TRAIN 1
60 barg
PR
ES
SU
RE
CO
NT
RO
L
LPG RE-INJECTION
LIQ
UIF
ICA
TIO
N-C
OL
D E
ND
LIQ
UIF
IED
NA
TU
RA
L G
ASOPF BOOSTER
PIPELINE
PRIG
OR
OD
NO
YE
65 – 90 barg65 – 90 barg
LNG OPERATIONALOVERVIEW
GAS TURBINECOMPRESSOR
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SEIC LNG Train 1
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SubstationElec/Inst
LNG Plant Overview
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Unit 1000 Inlet Metering
Feed gas from the OPF enters unit 1000 between 65 to 95 bar at ~20o C.
The gas leaves the unit at 60 bar at temperature of ~0o C.
The feed gas from U1000 is fed to U1100.
Unit 1000 consists of three parallel meter runs, each consisting of a feed
gas mono-cyclone separator (V-1001A/B/C), and a flow/pressure control
station.
This maintains the feed gas supply pressure at 60 bar to the LNG plant.
Each meter run is capable of supplying 33.3% of the overall design gas
Flow for the two LNG trains.
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U-1000 Gas Inlet and Metering
Gas Pipeline From OPFV1001 A/B/C gas
separators with flow & pressure control
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Unit 1100 Acid Gas Removal unit.
Purpose of the Acid Gas Removal unit is to remove
CO2 and H2S from the natural gas.
Why?
To prevent freezing and blockages in the liquefaction unit (U1400).
Each train has its own dedicated acid gas removal unit.
The solvent used in the unit is Shell Sulfinol D.
The solvent is made up of the following: Water 25%. Di-isopropanolamine (DIPA) 50%. Tetra-hydrothiophene-dioxide (Sulfolane) 25%.
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U1100 Sulfinol Treating
SubstationElec/Inst
U-1100 Acid Gas Removal Unit
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U-1100 Acid Gas Removal Unit
C-1102 – RegeneratorC-1101 – Absorber
V-1101– Feed Gas Knock-out Vessel
V-1103– Regenerator Overhead Accumulator
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Transporting C1101 for installation during construction
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
C1101
C1102 Raw gas U1000
Treated gasto driers
GAS SEPARATOR
V1102
Heat In
CO2 Out
U1100Principle Operation
Rich amine
Lean amine
To fuelgasCO2 is soaked up by the amineand removed in the regenerator
Absorber
Regenerator
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Purpose of U1300/U1350
Dehydration unit 1300To remove water present in feed gas from Unit 1100.
Why? To prevent downstream equipment blockage and damage by iceand hydrate formation during the gas liquefaction process.
Mercury removal vessel 1350To remove trace quantities of mercury that could be present in the feed to liquefaction.
Why?To prevent corrosion in the downstream equipment, and aluminium tube bundles of the MCHE’s.
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SubstationElec/Inst
U-1300 Dehydration Unit and U-1350 Mercury Removal
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U-1300 Dehydration Unit and U-1350 Mercury Removal C-1351 – Mercury Absorbent Vessel
C-1301 A/B/C – Molsieve Dryer Vessels
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
FAR, Substation and Analyzer House
SS-410FAR 1
ANC-1
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Purpose of Unit 1400
In unit 1400, the feedgas is progressively cooled until it condenses at around –158 degrees C and is subcooled to –162 before running down to the storage tanks. This reduces the overall volume around 600 times allowing one LNG tanker able to carry 600 times more than if the natural gas remained in a gaseous state. (135,000m3 LNG = 81,000,000m3! gas)
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
REFRIGERATIONPRINCIPLES Compressing a gas makes its pressure
and temperature rise because of the energy we have given it.
Depressuring this gas again would result in the pressure and temperature returning to
the same point as we started.
We have not changed this gas in anyway!
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
REFRIGERATIONPRINCIPLES
We can graph this and see exactly what has happened.
HOT
COLD
0
Tem
pera
ture
Pre
ssur
e
0% 100%0%Compression
LOW
HIGH
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
REFRIGERATIONPRINCIPLES
This time, after compressing the gas we will cool it to remove the heat energy we gave it.
HOT
COLD
0
Tem
pera
ture
Pre
ssur
e
0% 100%0%Compression
LOW
HIGH
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
REFRIGERATIONPRINCIPLES
This time when we depressure the gas the temperature becomes very low!
HOT
COLD
0
Tem
pera
ture
Pre
ssur
e
0% 100%0%Compression
LOW
HIGH
Additionaltemperature
drop
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
TREATEDFEEDGAS
LIQUIFIEDNATURAL
GAS-162
+10
MRLP
HP
-180
LNG PLANTPRINCIPLES
PMR
HP
LP
LIQ
UID G
AS
-80
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Treated feed gas from the mercury removal unit (U1350) is cooled
against low pressure PMR in E-1402 and fed to the scrub columns.
The scrub columns, C-1401 & C-1402, remove heavy hydrocarbons
(C5+) and the LPG’s from the natural gas stream for 2 reasons.
•These gases will condense too early in the fractionation section
•The LPG’s are used as the refrigerant in U1400 cooling circuits.
The bottom product of the scrub columns is fed to the fractionation unit
(U1500).
Purpose of Unit 1400
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SubstationElec/Inst
Purpose of Unit 1400 (Cold End)
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
LNG PLANTDETAILS
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U-1400 Liquefaction Unit
C-1401– Lower Scrub Column
C-1402– Upper Scrub Column E-1412– LP Pre-cool Exchanger E-1411– HP Pre-cool Exchanger
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Main Cryogenic Heat Exchangers
U-1400 Liquefaction Unit
SubstationElec/Inst
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U-1400 Liquefaction Unit
E-1415A – Main Cryogenic Heat Exchanger
E-1415B – Main Cryogenic Heat Exchanger
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U-1400 Liquefaction Unit
Internals of the Main Cryogenic Heat Exchanger
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SubstationElec/Inst
U-1400 Liquefaction Unit
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U-1400 Liquefaction Unit
V-1430 – Endflash VesselV-1425 – HP/MR Separator
V-1420 – LP MR Suction Drum
E-1430 – Light MR/Endflash Exchanger
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Process Description - PMR
PMRThe PMR (pre-mixed refrigerant) system utilizes pressurized PMR,a mixture of ethane and propane, evaporating at two pressures.This supplies refrigeration to the NG feed circuit, the MR circuit andthe fractionation unit.
The PMR is compressed by gas turbine driven PMR compressor K1440, power assisted by PMR compressor helper motor/generator(KM-1440).
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SubstationElec/Inst
Process Description - PMR
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
K-1440 PMR Compressor
HELPER MOTOR CENTRIFUGAL COMP GAS TURBINE
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
MR – Mixed Refrigerant
The refrigeration to fully liquefy the feed gas is provided by MR (mixed refrigerant).
This is a mixture of nitrogen, methane, ethane and propane.
The MR system is a closed loop refrigeration system utilizing two
compressors in series, K1420/30. They share a single shaft and are gas
turbine driven.
The LP MR compressor (K-1420) is a single stage axial machine and the
HP MR Compressor (K‑1430) is a two stage centrifugal machine.
The MR compressor starter/helper motor (KM‑1420) is used for starting
the compressor, and also to provide additional shaft power to maximize
LNG production.
Process Description - MR
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SubstationElec/Inst
Process Description - MR
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
K-1420/K-1430 MR Compressor
MAN
HELPER MOTOR CENTRIFUGAL COMP AXIAL COMP GAS TURBINE
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Process Description - End Flash System
End Flash System
Nitrogen in the LNG stream leaving the MCHE’s is removed in the endflash vessel. The nitrogen and some light hydrocarbons leave the top of the endflash vessel and exchange cooling in the light MR/end flash gasexchanger.
The gas is then compressed by the end flash gas compressor (K-1450)and routed via the end flash compressor after-cooler to the HP fuel gassystem.
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
K-1450 End Flash Compressor
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U1500 Process Description
Purpose of Unit 1500:
To remove heavy components from the feed gas
To extract refrigerant components, and make up ethane and propane for storage.
Also to produce stabilized condensate for re-injection in the crude oil.
Any LPG’s not used in the refrigerant circuit are re-injected back into the liquefaction section as part of the LNG rundown.
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
C1501 C1502 C1503 C1504
E1415
C1401
V1504V1503V1502
C2 Make up
U1600
C2 NGL
C3 Make up
U1600
C3 NGL
27barg 14barg 9barg 3barg
E1502 E1504 E1506
E1513
E1415
NGL
OET E1508
P1505 P1504
P1501
P1502
P1503
E1501 E1503 E1505 E1507
E1510C4 NGL
-50degC
-10degC35degC
40degC
109degC
-30degC
85degC
99degC
86degC 67degC
V1425Re-process
U1600Re-processNGL re-injection
PMR
PMR
HT
F
HT
F
HT
F
HT
F
C4
C2C3
103degC
Stabilisedcondensate
7degC-13degC
-15degC 33degC 38degC
Vapour Make up
Vapour Make up
C2C3
C4
C1
C5 + C4 + C3+ C2 +
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
SubstationElec/Inst
U1500 Process Description
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
U-1500 Fractionation Unit
C-1501– Demethanizer Column C-1503– Depropanizer Column
V-4201– Tempered Water Expansion Vessel
C-1502– Deethanizer Column C-1504– Debutanizer Column
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
The ethane and propane/PMR storage systems are common to both LNG Trains and are used primarily to supply start-up refrigerant for the PMR and MR cycles in the Liquefaction Unit, U-1400.
The purpose of Unit 1600 is to provide storage for refrigerant grade ethane and propane produced in Unit 1500 De-ethaniser and the De-propaniser.
U1600 Process Description
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U-1600 Refrigerant Storage
T-1602 – PMR StorageT-1601 – Ethane Storage
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LNG Storage Tanks
T-3101 LNG Tank No. 1T-3102 LNG Tank No. 2
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
To store and load Liquefied Natural Gas and to collect and compress the vapor generated from the process of filling the tanks.
This is known as BOG (boil off gas) Vapor created when loading LNG ships (ship vapor return) is used used as fuel gas
LNG Storage Tanks / Boil Off Gas
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
There are two LNG Storage tanks each with a capacity of 100,000m3
• Eight loading pumps each with a discharge capacity of 1250 m3/Hr
• One boil off compressor with a capacity of 730T/D
There are Four loading arms, Two for LNG liquid, One vapour return arm & a spare for either liquid or vapour service allow ship loading to be carried out based on a 24 hour turn around.
LNG Storage Tanks / Boil Off Gas
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Fuel gassystem
K3401Boil off gas
FLARE
T3100
V3401
Boil off gas header
TC
LC
PC
Vapour Arm
Loading Arm
LNG Loading line
End Flashcompressor
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Unit 6200 Flare system
Emergency Flare stack
Liquid disposal burners and Ops flare
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Why do we have a Flare System?
The flare system is used to collect and dispose vapour and liquid in a safe manner. (Safe disposal of Hydrocarbons, the first system online and the last system shut down)
Flare Systems
• Emergency operational system for cold, light, dry streams, liquid and vapour.
• Emergency operational system for warm, heavy, streams, liquid and vapour.
• Emergency operational system for LNG storage and loading, vapour.
• Operational flare system, vapour.
• LNG disposal system, liquid and vapour (start-up).
• Spare flare can be used for cold and warm service.
Unit 6200 Flare system
FLARE
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Warm Flare System (FWW)
All the warm vapours are collected into a single 48” header which slopes to the liquid knock-out drum V-6201. The header is continuously purged with LP fuel gas at sufficient flow rate to keep velocity at the tip of flare stack. Nitrogen connection is also given as back-up purge source.
Warm Liquid Disposal System (DHC)
The warm liquids from manual drains are collected in a 4” header and routed to V-6201. Light components are flashed-off and burned in A-6201 (FWW) The accumulated liquid in V-6201 is pumped and transferred to warm liquid burner A-6204 by P-6201A/B via 6” line.
Unit 6200 Flare system
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Cold Flare System (FCD)
Cold dry and light hydrocarbon vapours from unit 1400, 1500 and 1600 are collected into a 48” header which slopes to the cold flare KO drum V-6202.The header is continuously purged with LP fuel gas. Nitrogen connection is also given as back-up purge source.Vapour from the cold flare KO drum is directed to the cold flare (A‑6202) through a 56” line.
HP fuel gas is used as atomising gas to flare stack A-6202
Cold Liquid Disposal System (DLH)
All the cold liquids are collected into two 12” headers that are routed to the cold flare KO Drum (V‑6202). flashed vapours are removed and burned in A-6202.
Operational Flare System (FOP)
Any operationally initiated release is vented to a separate 16” FOP header.
The vented gas is routed to V-6203 and burned in operational flare (A-6211)
Unit 6200 Flare system
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Unit 6200 Flare system
Prigorodnoye LNG OverviewPrigorodnoye LNG Overview
Unit 6200 Flare system