Ds Nef-4a-8 Forced Air Vortex Flares.pdf

1284 East Sedgley Ave., Philadelphia, PA 19134 Telephone 1215 1 743-5300

(800) 523-3495 All USA/Canada

FAX (215) 743-3018 & 3020

Telex WU 84-5403

NAO Forced-Air Vortex Flares:

NFAV, NDFAV, NHFAV# NFAV-JPlR & NFAV-SRJGR Unequalled efficiency for quiet, smokeless flaring n versatility R rehbility q and sign&ant operating-energy consewation n

of all -13 of gases . simpkity

IWO’s air-blower flares combine clean, quiet flaring with minimal energy expenditures, even when waste-gas compositions or flow rates change from minute to minute. The most vezsatile and flexible smokeless k-e is the forced air blower with its c&al gas and air ducts. To further increase the efficiency of this versatile smokeless flare, NAO has designed u unique ting section at the junction of the waste gas and air ducts. The gas from the flare pipe is relwsed through @ented VorTuJe~loP whgs that radiate out like the spokes of a wheel. The upper edge of each wing or vane is tilted to credte a swirling vortex ackn. Each VorTuJector wing has a @r of outriggers which are smaller versionsof the large VorTuJ&or wings. This unique pcrtentd configuration produces a uniform mixing of the gas and & - with reduced difYusion distances -without the b&kage of mechardcul vanes or other obstructions in the air flow. The UPPF edge of each outrigger is tilted in the same direction as the main vane to further enhance the swirling vortex motion. Within NAo’s unique VorTuJectorloutrigger mixing &on, crll of the primary cdr is thoroughly mixed with the waste gas for ultra-efficient utilization of the for&-air supply _ so that smokeless operation is assured with minimal air rquirement, even at the full rated capacity of the flaE, Since the forced-air outlet stream has a velocity of approtimately 55-60 mph, it creates its own artificial wind as the combustible mixture leaves the flare tip. This artificial wind holds the flame erect, regardless of ambient wind conditions. And the ultra-stable flame pattern created by the swirling vortex action reduces flame tilt and thermal radiation in the work ara. With an NAO forced-air vortex (NFAV) flare, no energy is consumed until the unit’s flow sensor ‘detmts a wccste-gas flow and automatically starts

the air blower. Automcrtic controls and NAo’s reliable, retractable M.XPilots, with individual windshields, prevent hazardous or environmentally offensive discharges to the atmosphere, onshore or offshore.

with

MiniPilot

I

Wmdshield

VQ?M&d (Gaszjmted Vanes with Outriggwn Produm Swirling Vortex Action

NAO smokeless forced-air vortex flare is mounted on a km for this offdmre drilling platform in Cook Inlet. Ah&a.

The blower for an NFAV flare can lx positioned directly under the flere stack, adjacent to the stuck, or it can bs extended away from the flare by using a horizontal air duct. Its opetion is regulated by an electronic solid-state flow seflsor. This rugged, reliable sensor can be removed and inspected for routine maintenance, even when the flare is on-stream. ?mnMaLcmErr~HsPEED Depending upan the’flow of the hydrozarbn waste gas, the sensor will activate the air blower at either normal or high speed . . . to provide the proper amount of air for smokeless operation. When no gas is bzing flared, the llow sensor automatically turns off the blower. Used in conjunction with an NAO automatic pilot ignition system, the entire NFAV flaring system becomes self-sustaining, It requires no operutionul assistunce or attention. At any time, the NFAV is reudy to do its job - regardless of the composition or flow rate of the waste gas. The NFAV is available in a full range of flare tip diameters (waste-gas pipe sizes) from 1 to 48 inches. The advantages of an air-blower flare to insure smokeless operation, as compared to steam injection, are many. The table on this page shows the amount of air required for stoictiometric combustion of a wide range of hydrccarbons. Only a fraction of the stoichiomet ric air n&s to be supplied by the blower’s primary air, Secondary air will be entrained by the flame.

Air Requirements for Smokeb4l3 Combustion h F&ly Independent of the Molecdar Weight of the Wade GQS: EIwrupE, . . . . . . . . ..m.. 16.1 PROPANE . . . . . ...*... 15.7

MI-Pmm . . . . . . . *“. 15.4

IsoPENTANE . . ..*... . 15.4

:

Air requirements for smokeless combustion change very little through the entire list of olefins and paraffins. That’s why a simple two-s@ blower is all that is required to provide the proper air-to-hydrocarbon ratio for smokeless flaring. As an important added bus. extremely high tumdown ratios can be achieved through the use of forced air. Should an unexpxted power failure occur, thus shutting down the flare’s air blower, the NFAV will continue to function as if it were a standard emergency fhe. During such a power failure, however, the flaring of heavy hydrocarbons for emergency pressure relief will cau* smoking. Continuous piloting and ignition cm be assured with built-in kmttery PC&S m the controi panel. Fan operation can be continued if auxiliary gasohneor desel engines are provided.

MFAV-SR FLARE VofiJector@ Vanes with Outriggers r. for Waste Gas

Windsbld with Comptete Floorplate

7

7,‘\’ /

Retractable MintPilot with

. Air Blower Optional Duct ConfQwration: For Remote Location of Air Blower

m FOR UEUVY SMOKERS

For excepfional!y heuvy hydrocarbons and high flow rates, a Jet-Mix steam ring can be used in conlunction with a forced-air vortex flare. This NFAV-SR configuratIon combines all the highturndown energy conservation features of the basic NFAV plus un upper steam ring - for emergency smokeless flaring during a power outage. The steam ring can also extend the smokeless c-city of the flare. Although the upper steam nng can lx used to reduce smoking m the event of a power falure that shuts down the air blower, it cannot maintain the very low noise levels that are inherent with the ultra-efbcient NFAV smokeless flare. The NFAV-SR is avcnlable in a full range of waste-gas flase-tip diameters from 1 to 60 inches. When separate high-pressure and low-pressure waste streams must be flured, NAO can provide a dual flare. This duel-flare, forced-air vortex configuration is actually two forox&air flares with one common air duct. While this dual flare (NDFAW resembles and performs tie a single NFAV, the two waste strums are maintained completely independent from mch other.

NDFAV FLKRE: COAXIAL DWAL FLARE VorTu Jectom Vanes for Waste Gases Second

VorTu JectonB Vanes for Waste Gases Flnidb Seal@ Retractable MiniPilot with hdividual Windshield

/ CoaxiLl Gas Main/Air Duct

One waste-gas pipe runs up the outside of the air duct; the other is positioned within the air duct. Thus, we actually hwe two independent flares that share a common supply of forced primary ar. At the flare tip, both waste-gas streams can be flared smokelessly at the same time. And because both waste streams are completely independent, there is no possibility of a I~ck-flow or Ixrckpressure problem , even when the highpressure waste gas is the only stream being flared. Every NDFAV flare, designed as a single and complete unit to flare hrgh- and low-pressure waste stream, is built to handle the total flow of the two streams-but at each of their respective pres;uTe levels. (Typxul pressures range from 1 to lOly W-C. Higher-pressure applications can be handled with NFAV-JMR flares.) This properly engineered design includes indvidual flow serlsors m ecrch waste-gas stream to feed continuous signals to an electronic solid-state adder that sets the blower for the proper total overall air Ilow. (lf a single flare were used, then a much larger flare - desIgned for the total flow at the lowest pressure -would be requlred. Such a flare would be lazy, inefhcrent, have a poor turndown ratio, and be an impractical solution to the problem. 1

NAO’s dual flares are available in various sizes and configurations to match application requirements. ZLRmmanHDEmaII At the duai flare tip, radially spaced vanes or arms from one was&gas main are lx&tioned l3r+ tween the arms from the other gas main. Hence. the VorTuJectore openings from the secondary main swirl the waste gas from that main in the Same controI& vortex @tern that is mcrintatnd abcve the coaxial gas/air duct. The result is thorough and complete mixing of the waste gases with ail of the primary air. With ail members of the NFAV flare family, including the dual flares, the flame is extremely stable even at high-wind conditions. Since thy ultraefficient air-blower flares create a built-in artificial wind with speeds up to 55-60 mph, they are frequently used on offshore platforms where adverse wind and weather conditions can be espscially severe. On an offshore platform, the NFAV’s stable well- knit flame with its significant reduction in platform-l-1 radiatton is very important. Since space is at u premium, the movement of equip ment or personnel to escape from excetive heat is limited. This is one of the main runs why NAO’s forced-air vortex 5ares are j.n use on offshore pIatforms from the North Sea to the Gulf of Mexico to Alaska’s Cook Inlet. coolJnaQ=mcT The use of forced primary air results in longer flare life bezause of the overall cooling eff& provided by the forced air. It cools the inside of the air duct, the outside of the gas pipe or main, and atl VorT.Jector vanes and outriggers. Furthermore, with its strong artificiaI wind and controlled swirling action, all combustion takes place within a controlled zone just ah the fIare tip and never within the tip itself. This, obviously, extends flare life. With any NFAV flare, the only moving ports (the blower) are ti ground l-1, where petic&c maintenance can be performed easily. Unlike competitive air-blower flares, there are no moving parts to jam or wear out necrr the high-temperature combustion zone. mFm.~ALloRIERmrRLFLmlE This 5are is similar to the N!?AV-SR. However, the upper ring is used to in&t a Mgh-pressure waste gate through the Jet-Mix nosh. The swirling waste gas helps to hold the flame erect and keeps it from licking down the outside of the tip and stack. The N!?AV-JMR is Iess mnsive than the co&aI d u a l flare. . but it requires higher waste-gas pressures for the upper Jet-Mix ring. For smokeless flaring of low-pressure 11-100” WC.1

Windshield

and high-pressure 15-150 pig) waste gases, the NFAV-MR is available for low-pressure wastegas pipe sizes from 1 to 36 inches and for high-

PJACI’s horizontal forced-air vortex flares are available with waste-gas pipe diameters from 1 to 36 inches.

pressure wastegus pipe sizes from 1 to 10 inches

in diameier.

Every NAO flare tip is supplied as a complete package, with all necessary mounting brackets, piping and Wing lugs, complete and =dy for operation. For horizontal applications, supports

NoRIzowFzu-cRTIom Any NAO forced-air vortex flare can be adapted for horizontal as well as vertical appli&iom or at any intermedicrte angle. These horizontal configurations may be the best solution for smokeless flaring of heclvy hydrozur~ns near residential arms, or where liquid carryover presents special problems. NAO’s horizontal forced-air vor?ex (NHFAW flares will operate very very efficiently. . . and without notice by the residents of nearby communities.

are custom-designed by NAO and usually a~ provided by the customer. NAO’s patented Fluidic Seal* (optional) is ret-

ommended for all appliccrtions, horizontal, vertical or any angle in-between. This nomoving-m sd turns back intruding air at the flare tip; eliminates burn-back tide the tip and stack; and can siqnificuntly extend flare life.

Other members of NH% funnily crf engineered flme-?ip configuratiams

include:

Clwr GM Flanx _ _ , . . , . . , . . , . . . , , . _ _ Data Sheet NEF-4A-I NEF.4A-2 “Soft-Mix” Quiet Flares . ~ . . . . . _ _ _ LowNoiseFhres ._...__..__.___......_,.. Pm-4A3 Ringund-Center (Swirling Steam) SmokelessFlares ._..._..._..._......... NEMA-4 “Brmhing” Steam-Ring NW-4A.401 und “Cool Burning” Flares . , . , , . . _ Cant rolled “Ball -of -Flame” and NEF--4A.5 Other C&-Assist Flares . . . _ _ and NEF-4A-501 let-Mix@ Flures . . _ . _ _ _ . . . . . . . . . . , . . . NW-4A-6 NJF.4A.7 Water-Injectian Flares , . . . , , . . . . . . _ . . J

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(800) 523-3495 F&E

k ’

All USA/Canada

. . . . Ow 80 years of leadership by design 1284 East Sedgley Ave., Phlladeiphia, PA 19134, U.S.A. Ofhces In mqor cities of the world

Telephone (215) 743-5300 FAX (215) 743-3018 & 3020 PRINTED 1N US A, KIM,1093

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