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En los sistemas de adsorción generales, el gel de sílice:

Puede manejar fácilmente una amplia gama de velocidades de ujo de

alimentación y amplias variaciones.

 Tiene un alto rango de caudales.

• Se adapta fácilmente a los camio de condiciones de operación

• !frece disponiilidad instantánea "despu#s del primer ciclo todavía

ofrece gas acondicionado seg$n las especi%caciones.• Son fáciles de operar y tienen poco mantenimiento "se puede

controlar a distancia&.• 'o consume energía durante la operación en reposo.

•

 Tienen relativamente pe(ue)a demanda de energía durante laregeneración "*+ -tu frente a + -tu en esta comparación

de adsorción de sílica gel frente a asorción de TE/&.

0igura: Sistema típico de remoción de 1umedad del gas

natural usando asorción a ase de glicol.

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2ater in 3i(uid 0orm

21ereas 4ater vapor is easily adsored y silica adsorents, t1e presence

of 4ater droplets in natural gas streams poses additional prolems. 0or

instance, 4ater droplets create a 1ydraulic 51ammer6 e7ect, and lead to

locali8ed over1eating, 41ic1 causes t1e adsorent materials to rea9 do4n. T1is leads to 1ig1er pressure drop and c1annelingreducing t1e overall

performance of t1e unit.

;n addition to t1e use of an inlet separator to ma<imi8e 4aterdroplet

removal, a guard layer "e(ual to aout += of ed volume& of

speciali8ed, 4aterstale adsorent can e added on top of t1e main

adsorent ed. T1is 4ater staility can e imparted using tempering, i.e.

1eating to 1ig1 temperatures over a long time, 1o4ever, t1is process

reduces greatly 4ater adsorption capacity.

2ater stale Soread adsorents are produced according to precisionmanufacturing procedure, 4it1out resorting to tempering 1aving full li(uid

4ater staility and 1ig1 capacity. T1is often allo4s for smaller vessels and

longer lifetimes of t1e main ed. >se of 4ater stale Soread as a guard

ed is common in suc1 applications suc1 as 3'/ units, 41ere t1e main

adsorent isn?t even a silica gel, ut a molecular sieve.

@EA!B;'/ CEDB CF@!GD@-!'S 0@!A 'DT>@D3 /DS

Ceavy 1ydrocarons, 41ic1 can condense out of a natural gas stream, are

anot1er common cause of plugging in gastransmission pipelines and

valves, and t1ey can foul related e(uipment suc1 as gasseparation

memranes. Suc1 constituents are typically descried in terms of t1e

1ydrocarons and 4ater vapor from natural gas. T1e design of as silica

ased system for 1eavy 1ydrocaron removal is more complicated t1an t1at

of a system for t1e removal of 4ater only.

0or instance, di7erent grades of silica gel may e re(uired. T1e system must

e designed to accommodate t1e adsorption of more t1an one component.

Dnd muc1 s1orter cycle times "as s1ort as HIJ minutes& are typically

re(uired, as are often t1ree or more adsorption vessels instead of t4o

"furt1er discussion of t1is is eyond t1e scope of t1is articleK for moreinformation, consult your adsorent supplier&.

Several nonasorption related tec1nologies including lo4temperature

separation "3TS&, turo e<pansion, and mec1anical refrigeration are also

used to remove 1eavy 1ydrocarons from natural gas streams "additional

discussion of t1ese tec1nologies can e found in @eference&. Today, silica

ead adsorption o7ers a coste7ective alternative to t1ese approac1es.

@EA!B;'/ ';T@!/E' 0@A 'DT>@D3 /DS

;n addition to 4ater vapor and 1eavy 1ydrocarons, natural gas streamsalso contain un4anted nitrogen. 'itrogen is inert, so its presence depresses

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t1e fuel value of natural gasK as suc1, it is typically removed to residual

levels around H=.

 T1is typical cost comparison of t1e moistureremoval processes s1o4n in

%gures + and "t1e use of adsorption via silica gel eads, versus

asorption using TE//&, s1o4s t1at t1e TE/ased met1od is generally

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0@!A H T! H ou Gan count on dtn Fiamond control terminal

management.

Fepicted is a typical adsorption cycle for t1e removal of 1eavy

1ydrocarons from natrual gas.

dtn/uardianL delivers superior

onsite and remote terminal

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