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APPLICATION REPORT

2721 / 22 / 01 • 8 / 2 011

Amine plant - absorption

Feed

Sour Gas

Absorber

Make-up water

Sweet gasCondenser

Acid gasH2S + CO2

Regenerator

Vapor

Reboiler

LiquidLean amine

2. Rich amine

1. Lean amine

Rich amine

Steam

Process overviewGases from various reery rocessig oera-

tios cotai hydroge suhide ad occasio-

ay caro dioxide. Some H2S i reery gases

is formed as a resut of coversio of suhur

comouds i rocesses such as hydrotreatig,

crackig ad cokig. Evirometa ad ieie

reguatios require that most of the H2S must e

removed from reery fue gas ad coverted to

eemeta suhur.

I geera, the diethaoamie (DEA) rocess

has ee the most widey used for reery gas

treatig. Methy-diethaoamie (MDEA) ca e

used to reace DEA to reduce the asortio of

caro dioxide ad therey roduce a acid gas

with higher cotet of H2S. This rovides some

imrovemet i suhur recovery efciecy. The

amie soutio is umed to the to of asorer

cotaiig mutie trays ad ackig. H2S ad

CO2 are removed from the gas y asortio

ito the soutio. Rich soutio from the asorer

ows ito a ash tak that is oerated at ower

ressure ermittig the vetig of ay etraied

ight hydrocaros from the system. The rich so-

utio is the reheated ad acid gases stried

from the soutio i a regeerator or strier y

steam geerated i reoier. Acid gases from the

to are set to a suhur recovery uit. The ea

soutio is cooed ad set ack to the asorer.

May reers have mutie amie asorers

ad a commo amie regeeratio uit. Some

reeries have oe regeeratio uit for ceaer

uroses, such as hydrotreaters ad aother for

FCC or cokers. Oeratig coditios are usuay

such that the treated gas meets the secica-

tios for H2S ad CO2 cotet. This is co-

troed y the amout of soutio circuated ad

steam geerated i the reoier.

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2721/22/01 AMInE plAnT - AbSORpTIOn

2 ApplICATIOn REpORT 8/11

Amine plant challengesMajor oeratig cosideratios for amie uits

are maitaiig the coditio of the amie sou-

tio, miimizig osses ad revetig hydro-

caro carryover to the suhur at. This ca

e otaied y cotroig amie cocetratio,

amie circuatio rate, ea amie temerature

ito the asorer ad striig steam geerated

i the strier reoier. Otimizatio of a amie

at is a aace etwee caacity, eergy ad

corrosio.

Health, Safety, Environment – Vave eakig

oses oth a evirometa ad safety issue

due to risk of re ad toxicity of voatie gases.

ESD ad o/off vaves must e ae to erform

their actio i a rocess or equimet faiure.

Top-class products at maximum yield – The

market cas for cea roducts ad high quaity.It is imortat that the rocess is stae, exie

ad uder cotro. poor cotro vave erfor-

mace reduces the accuracy of throughut

cotro ad adversey affects to the at erfor-

mace ad aso the dowstream rocesses.

Maintenance costs – poory erformig vaves

i the rocess must e serviced ecause they

wi have a direct imact o the efciecy of the

rocess. The cost of uschedued maiteace

wi e quite high, u to 70% of the cost of a ew

vave i some aicatios. Add this to the costof removig the vave from the ie ad disru-

tio of the rocess ad the tota cost wi e

much higher.

Plant run-time – Reeries are ookig for

oger at ru-times sice dowtime meas

roductio osses ad is a remarkae cost

icudig maiteace costs. This requires rei-

ae equimet ad rocess cotro.

Metso solutionsWe are a tued u to aswer these chaeges

through our reig aicatio exeriece ad

roduct offerig for cotro, safety ad auto-

mated o/off duty that esure high vave erfor-

mace i amie ats.

Safety – Rotary stem oeratio reduces fugitive

emissios ad rotects from eakig. packig

costructio meets the atest emissio sta-

dards. Our roducts are re tested ad ay to

the atest stadards. nees VavGuardTM artia

strokig wi esure that at emergecy shut-

dow vaves wi aways erform roery whe

eeded.

Efficiency – Throughut osses due to stickig

ad oor cotro erformace wi e avoided

with high erformace rotary vaves. Fow

through the rocess uit may e chaged asthe eed arises with rageaiity of 150:1 ad

further with fu ore a vaves. Our advaced

nD9000 digita vave cotroer esures higher

ositioig accuracy ad faster resose to

reduce rocess variaiity. Correct vave seec-

tio ad sizig with our nerof-rogram we ca

assure the est vave erformace ad rocess

cotro.

Availability – Sime rotary desigs, same face-

to-face dimesios, ad goa service etwork

ad ivetory maagemet wi he you tootimize your maiteace activities. Rotary

vaves have ee i service for severa years

without requirig maiteace ad show o sig

of eakage.

Reliability – Tred data coected y our smart

vave cotroers ad aaysed y FiedCare

coguratio ad coditio moitorig software

ased o oe FDT/DTM techoogy makes it

ossie to redict ad resod to maiteace

requiremets ad reduce uschedued dow-

time. This gives fu trasarecy to the vave

erformace i rocess cotro.

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AMInE plAnT - AbSORpTIOn 2721/22/01

ApplICATIOn REpORT 8/11 3

Absorber applications1. Lean amine control

Challenge – Oe the most imortat secica-

tio i amie rocess is the acid gas cotet i

the treated gas. The amie circuatio rate is

oe of the two tyica rocess variaes to e

otimized. The amie ow rate is maiuated

accordig to the acid gas oadig to the asor-

er. Variatios i the ow rate have a effect o

the rocess efciecy, ea amie temerature

ad ea amie oadig. Asorer tray efciecy

cotro is imortat i order to otimize gas

asortio caaiity. Variatios i amie quaity,

such as soids ad foamig affect to the systems

staiity ad asortio efciecy.

Metso solution – Fietro eccetric ug vave

for geera ad rotary goe vave for sma

caacity aicatios. Sef-ushig q-trim is

avaiae as otio for cavitatio cotro.

Benefits – Vave ays a sigicat roe i co-

tro oo, eseciay whe high oo erformace

is targeted. With our cotro vaves the variai-

ity ca e reduced. This makes it ossie to

oerate the asorer coser to the edge of the

oeratig eveoe. The savigs are reaized

i reduced amie cosumtio. log astig

meta seat tightess miimizes amie osses

ad gad ackig structure reduces the emis-

sios to the eviromet. process reiaiity ca

e imroved y nD9000 o-ie diagostics thatrovides fu trasarecy to vave erformace.

Wide rageaiity with rotary vaves esures that

ea amie circuatio rate ca e chaged as

eed arises durig the ru eriod.

Neles RotaryGlobe

2. Rich amine let-down

Challenge – Rich amie et-dow vave at the

ottom cotros the iquid eve i the asorer.

Rich acid gas oadig must ot e too high due

to otetia corrosio roems. The rich amie

from the ottom is set to a ash tak which is

at ower ressure, causig the eftover methae

or ethae gas to e reeased ad used as fue

gas. Deedig o the asorer ressure the

ressure dro across the vave ca e from few

arG u to 170 arG. Two-hase ow, ashig

or outgassig ca e exected i this aica-

tio.

Metso solution – Fietro ow to cose for medi-

um ressure aicatios ad T-series to etry

vave for high ressure aicatios (u to ASME

1500). Variety of hard coatigs ad q-trims are

avaiae for severe ashig aicatios.

Benefits – log astig meta seat tightess

ad rotary stem reduces amie osses ad the

gad ackig structure reduces the emissios

to eviromet. Esure at avaiaiity y co-

troig ashig, erosio ad corrosio. process

reiaiity ca e imroved y nD9000 o-ie

diagostics that rovides fu trasarecy to

vave erformace.

Finetrol

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The iformatio rovided i this ueti is advisory i ature, ad is iteded as a guideie oy.

For secic circumstaces ad more detaied iformatio, ease cosut with your oca automatio exert at Metso.

Metso Automation Inc.

Europe, Vanha Porvoontie 229, P.O. Box 304, FI-01301 VANTAA, Finland.Tel. +358 20 483 150. Fax +358 20 483 151

North America, 44 Bowditch Drive, P.O. Box 8044, Shrewsbury, MA 01545, USA.Tel. +1 508 852 0200. Fax +1 508 852 8172

South America, Av. Independéncia, 2500- Iporanga, 18087-101, Sorocaba-São PauloBrazil. Tel. +55 15 2102 9700. Fax +55 15 2102 9748/49

Asia Pacific, 20 Kallang Avenue, Lobby B, #06-00, PICO Creative Centre, Singapore 339411, Singapore.Tel. +65 6511 1011. Fax +65 6250 0830

China, 19/F, the Exchange Beijing, No. 118, Jianguo Lu Yi, Chaoyang Dist, 100022 Beijing, China.Tel. +86-10-6566-6600. Fax +86-10-6566-2575

Middle East, Roundabout 8, Unit AB-07, P.O. Box 17175, Jebel Ali Freezone, Dubai,United Arab Emirates. Tel. +971 4 883 6974. Fax +971 4 883 6836

www.metso.com/valves

APPLICATION REPORT

Optimize your amine plant performance, re-

duce energy and maintenance costs and pro-

duce top-class products with our intelligent

rotary control, on-off and ESD-valves.

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