prigorodnoye lng overview lng prigorodnoye overview

Prigorodnoye LNG OverviewPrigorodnoye LNG Overview

LNG Prigorodnoye 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


SEIC LNG Train 1


SubstationElec/Inst

LNG Plant 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.


U-1000 Gas Inlet and Metering

Gas Pipeline From OPFV1001 A/B/C gas

separators with flow & pressure control


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%.


U1100 Sulfinol Treating

SubstationElec/Inst

U-1100 Acid Gas Removal Unit


U-1100 Acid Gas Removal Unit

C-1102 – RegeneratorC-1101 – Absorber

V-1101– Feed Gas Knock-out Vessel

V-1103– Regenerator Overhead Accumulator


Transporting C1101 for installation during construction


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


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.


SubstationElec/Inst

U-1300 Dehydration Unit and U-1350 Mercury Removal


U-1300 Dehydration Unit and U-1350 Mercury Removal C-1351 – Mercury Absorbent Vessel

C-1301 A/B/C – Molsieve Dryer Vessels


FAR, Substation and Analyzer House

SS-410FAR 1

ANC-1


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)


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!


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



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


LOW

HIGH



This time when we depressure the gas the temperature becomes very low!

HOT

COLD

0

Tem

pera

ture

Pre

ssur

e


LOW

HIGH

Additionaltemperature

drop


TREATEDFEEDGAS

LIQUIFIEDNATURAL

GAS-162

+10

MRLP

HP

-180

LNG PLANTPRINCIPLES

PMR

HP

LP

LIQ

UID G

AS

-80


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


SubstationElec/Inst

Purpose of Unit 1400 (Cold End)


LNG PLANTDETAILS


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


Main Cryogenic Heat Exchangers


SubstationElec/Inst



E-1415A – Main Cryogenic Heat Exchanger

E-1415B – Main Cryogenic Heat Exchanger



Internals of the Main Cryogenic Heat Exchanger


SubstationElec/Inst




V-1430 – Endflash VesselV-1425 – HP/MR Separator

V-1420 – LP MR Suction Drum

E-1430 – Light MR/Endflash Exchanger


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).


SubstationElec/Inst

Process Description - PMR


K-1440 PMR Compressor

HELPER MOTOR CENTRIFUGAL COMP GAS TURBINE


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


SubstationElec/Inst

Process Description - MR


K-1420/K-1430 MR Compressor

MAN

HELPER MOTOR CENTRIFUGAL COMP AXIAL COMP GAS TURBINE


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.


K-1450 End Flash Compressor


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.


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 +


SubstationElec/Inst



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


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.



U-1600 Refrigerant Storage

T-1602 – PMR StorageT-1601 – Ethane Storage


LNG Storage Tanks

T-3101 LNG Tank No. 1T-3102 LNG Tank No. 2


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


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


Fuel gassystem

K3401Boil off gas

FLARE

T3100

V3401

Boil off gas header

TC

LC

PC

Vapour Arm

Loading Arm

LNG Loading line

End Flashcompressor


Unit 6200 Flare system

Emergency Flare stack

Liquid disposal burners and Ops flare


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.


FLARE


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.



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)


prigorodnoye lng overview lng prigorodnoye overview

Documents

prigorodnoye lng overview

acid gas removal unit

gas inlet

acid gas removal unit

lng trains

feed gas knock

mercury removal slide

metering gas pipeline