Gasketed PHE

8/7/2019 Gasketed PHE

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Compact HeatCompact Heat

ExchangersExchangers


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Definition of HeatDefinition of Heat

ExchangerExchanger A heat exchanger is a device that is used toA heat exchanger is a device that is used to

transfer thermal energy (enthalpy)transfer thermal energy (enthalpy)

between:between: two or more fluidstwo or more fluids

a solid surface and a fluida solid surface and a fluid

or between solid particulates and a fluidor between solid particulates and a fluid

at different temperatures and in thermalat different temperatures and in thermalcontactcontact

Usually no external heat and workUsually no external heat and work

interactions.interactions.


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Applications of HeatApplications of Heat

ExchangerExchanger Typical applications involve:Typical applications involve:

heating or cooling of a fluid stream ofheating or cooling of a fluid stream ofconcern andconcern and

evaporation or condensation of singleevaporation or condensation of single-- oror

multimulti--component fluid streams.component fluid streams.


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ContCont

In other applications, the objective may be:In other applications, the objective may be:

to Recover or reject heatto Recover or reject heat

to Sterilizeto Sterilize

to Pasteurizeto Pasteurize

to Fractionateto Fractionate

to Distilto Distil

to Concentrateto Concentrate

to Crystallize orto Crystallize or

to control a process fluidto control a process fluid


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Classification of HeatClassification of Heat

ExchangerExchanger


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Compact Heat ExchangerCompact Heat Exchanger

Gaining large portion of heat exchangerGaining large portion of heat exchangermarket due to the following reasons:market due to the following reasons:

Equipment costs risingEquipment costs rising

Limited available plot spaceLimited available plot space

These are nonThese are non--tubular exchangerstubular exchangers


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Plate Type HeatPlate Type Heat

ExchangersExchangers PlatePlate--type heat exchangers are usually builttype heat exchangers are usually built

of thin plates.of thin plates.

The plates are either:The plates are either: Smooth orSmooth or

Have some form of corrugation, andHave some form of corrugation, and

T

hey are either:T

hey are either: Flat orFlat or

Wound in an exchangerWound in an exchanger


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Classification of PHEsClassification of PHEs

Plate heat exchangers (PHEs) can bePlate heat exchangers (PHEs) can beclassified as:classified as:

GasketedGasketed Welded (one or both fluid passages)Welded (one or both fluid passages)

Or brazed, depending on the leak tightnessOr brazed, depending on the leak tightnessrequired.required.

Other plateOther plate--type exchangers are:type exchangers are: Spiral plateSpiral plate

Lamella andLamella and

Plate coil exchangersPlate coil exchangers


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Gasketed Plate HeatGasketed Plate Heat

Exchangers:Exchangers: It consists of a number of thin rectangularIt consists of a number of thin rectangular

metal plates sealed around the edges bymetal plates sealed around the edges by

gaskets and held together in a framegaskets and held together in a frame Frame usually has a fixed end coverFrame usually has a fixed end cover

(headpiece) fitted with connecting ports and(headpiece) fitted with connecting ports anda movable end covera movable end cover

In the frame, the plates are suspended fromIn the frame, the plates are suspended froman upper carrying bar and guided by aan upper carrying bar and guided by abottom carrying bar to ensure properbottom carrying bar to ensure properalignment.alignment.


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ContCont

For this purpose, each plate is notched atFor this purpose, each plate is notched atthe centre of its top and bottom edges.the centre of its top and bottom edges.

The plate pack with fixed and movable endThe plate pack with fixed and movable endcovers is clamped together by long bolts,covers is clamped together by long bolts,thus compressing the gaskets and forming athus compressing the gaskets and forming aseal.seal.


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Construction ofConstruction of GasketedGasketed

Plate Heat ExchangerPlate Heat Exchanger


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How it works?How it works?


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ContCont


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ContCont


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Fouling in Plate HeatFouling in Plate Heat

Exchanger:Exchanger: Here Fouling considerations consideredHere Fouling considerations considered

differently than for shelldifferently than for shell-- andand--tubetube

equipmentequipment The nature of plate heat exchangerThe nature of plate heat exchanger

equipment tends to reduce fouling due to:equipment tends to reduce fouling due to:

High turbulence,High turbulence,

Narrow highNarrow high--velocity flow channels whichvelocity flow channels whicheliminate low flow areas found in shelleliminate low flow areas found in shell--andand--tubetubeequipment, andequipment, and

Stainless steel surfaces are impervious toStainless steel surfaces are impervious to

corrosion in most groundwater applications.corrosion in most groundwater applications.


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GasketedGasketed Plate HeatPlate Heat

ExchangerExchangerMaterialMaterial

Plates: Titanium, and most alloysPlates: Titanium, and most alloys Gaskets: NBR , Graphite and othersGaskets: NBR , Graphite and others Frames: Stainless steel or painted CarbonFrames: Stainless steel or painted Carbon

steelsteel

TemperatureTemperature

Rubber gaskets:Rubber gaskets: --35C to 200C35C to 200C G

raphite gaskets:G

raphite gaskets: --20C to 250C20C to 250C


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ContCont

PressurePressure

00 --25 bar gauge25 bar gauge

Transmission area/DutyTransmission area/Duty

Up to 3800 m2Up to 3800 m2

Various plate designs, plate types, corrugationVarious plate designs, plate types, corrugationpatterns and sizes.patterns and sizes.

Wide range of plate types has been optimizedWide range of plate types has been optimized

for meeting various process priorities and mediafor meeting various process priorities and mediacharacteristicscharacteristics


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Easy Clip gasketEasy Clip gasket

Easy and rapid gasketEasy and rapid gasketchangechange

One of the most simpleOne of the most simpleand most rapid form ofand most rapid form ofgasket attachment yetgasket attachment yetdeviseddevised

Can be repetitively fittedCan be repetitively fittedand removed as neededand removed as neededwithout damagewithout damage


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Customer benefitsCustomer benefits

Reduced service down timeReduced service down time

Reduced spare parts costsReduced spare parts costs


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Advantages of PHE:Advantages of PHE:

The best heat exchanger solution is mostThe best heat exchanger solution is mostoften a PHEoften a PHE

It is often the most economical solution.It is often the most economical solution.

It is compact.It is compact.

It has low weight.It has low weight.

It is easy to extend.It is easy to extend.


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Low Capital CostLow Capital Cost

Up to 70 % less cost.Up to 70 % less cost.

Less heat transferLess heat transfersurface, more efficient.surface, more efficient.

Less weight support /Less weight support /

foundation, compact.foundation, compact.

Higher heat transferHigher heat transferrates.rates.


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Lower Maintenance CostLower Maintenance Cost

Less labor, and service time.Less labor, and service time.

No extra equipment is required.No extra equipment is required.

Easy access for inspection and repairs.Easy access for inspection and repairs.

Low foulingLow fouling due to turbulent flow.due to turbulent flow.

Less complicated piping, modularLess complicated piping, modular


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Modular DesignModular Design

Easier drainage.Easier drainage.

Easy duty. adjustment/add or removeEasy duty. adjustment/add or removeplates.plates.

Increased flexibility/no welds to cut.Increased flexibility/no welds to cut.

Can be assembled or disassembled on site.Can be assembled or disassembled on site.


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Lower holdLower hold--up Volumeup Volume

8080--90% less hold90% less hold--upupvolume.volume.

More precise processMore precise processcontrol.control.

Lower weight.Lower weight.

Easier drainage.Easier drainage.


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Drawbacks:Drawbacks:

Generally Plate type heat exchangers cannotGenerally Plate type heat exchangers cannotaccommodate:accommodate:

Very high pressuresVery high pressures TemperaturesTemperatures

Or pressure and temperature differencesOr pressure and temperature differences

Date post:	08-Apr-2018
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Gasketed PHE

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