Script FiredHeater HYSYS V7 3 Rev2

Aspen Fired Heater Models Embedded in HYSYS Simulations

Tutorial High Level Outline: Load HYSYS simulation of crude distillation system processing a medium crude Set up a red heater model to replace the simple heating utility Import a Aspen Fired Heater rigorous model of the atmospheric crude heater !plore the detailed modelling results "hange the crude to a heavy #lend "onsider potential revamp options to maintain production $ith heavy crude #lend

Lin%ing our &igorous Fired Heater 'odel Load the HYSYS Case: "()*AFH*+A',L*-.hsc

Make sure you have allowed for multiple stream onnetions! /o to Tools 0 ,references 0 Options  and hek the bo" for Allo$ 'ultiple Stream "onnections!

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Aspen Fired Heater Models Embedded in HYSYS Simulations

&ouble lik on the ri$orous pre'heat train sub'(owsheet to open it! Clik on the #arameter tab and hek the bo" for Ignored ! )hen lose the sub'(owsheet!

From the HYSYS pallet selet the *red heater unit operation and plae it on the (owsheet at a suitable spot!

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Aspen Fired Heater Models Embedded in HYSYS Simulations

&ouble lik your *red heater unit op! to open and for the radiant ,one inlet stream selet 1arm "rude .

For the radiant ,one outlet selet Hot "rude!

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Aspen Fired Heater Models Embedded in HYSYS Simulations For the fuel stream alloate the name Fuel and for the air stream type the name Air!  )ype the name Flue /as a$ainst the Combustion #roduts stream as shown!

.ow $o to the (esign tab and on the ,arameters ply selet (& Fired Heater from the drop down list!

/n the 1or%sheet tab and the "omposition ply set the Air omposition to 0!12 . + and 0!++ / +! )hen set the Fuel omposition all Methane!

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Aspen Fired Heater Models Embedded in HYSYS Simulations

/n the "onditions ply set the Air temperature to +45C and the pressure to % bar! Set the Fuel temperature to +45C and + bar!

6o to the (& FiredHeater tab and lik the Import button! Selet the FiredHeater 7!E&89 *le from the loation you have eleted to stored it: AFH*T$n*"a#in )he (owsheet will onver$e rapidly with Aspen Fired Heater modellin$ the heater performane and alulatin$ the fuel (ow reuirement to meet the spei*ed inlet and outlet onditions on your HYSYS ase! Clik on the Fired Heater ;nit operation< $o to the (& FiredHeater tab and the Summary ply!

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Aspen Fired Heater Models Embedded in HYSYS Simulations

Here you an see some of the key performane results for your Aspen Fired Heater detailed model! )he alulated duty should be very lose to the simple HYSYS heatin$ utility< whih ori$inally modelled the *red heater< is almost ==M>! )he alulated overall e?ieny is 23!1@ and the reuired fuel (ow to ahieve that is 4=01 k$hr! You may like to note that the peak tube wall temperature indiated for tubes in the heater *rebo" is 3035C! You an see how the furnae duty divides between the two tube banks of the onvetion setion and the *rebo"!

!ploring the 'odel .ow let us look at the heater model we have imported to understand its $eometry! Clik on the (& 2ro$ser button!  )he user interfae of Aspen Fired Heater will open so that you an see $eometry< modellin$ options and alulated results in more detail! 6o to Input 0 Heater /eompetry 0 Fire#o!  and the Layout tab!

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Aspen Fired Heater Models Embedded in HYSYS Simulations

>e have a twin bo" 7or twin abin9 onstrution with eah bo" 2m hi$h< +0m lon$ and 3m wide! Bf you $o to the Fire#o! (iagram tab you will see that eah bo" has - paths 7or passes9 on eah wall with +2 vertial hairpin tubes in eah path! You may like to e"plore the other tabs here!

6o to Input 0 Heater /eometry 0 "onvection 2an%s  and the "onnections diagram tab FiredHeater models in HYSYS

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Aspen Fired Heater Models Embedded in HYSYS Simulations

 )his shows the warm rude stream (ows throu$h the heater elements from the + nd onvetion bank to the % st and then into the *rebo"! Clik on the Layout tab!

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Aspen Fired Heater Models Embedded in HYSYS Simulations  )his shows how the proess (ow throu$h the heater has been spei*ed by the (ow history spei*ations for eah bank! >e have a simple arran$ement with one stream and have used the default seletions! Bf you lik on 2an% (etails tab you will see illustrated how the tubes of the two onvetion banks are arran$ed!

 You may also like to look at the other tabs to see the preise tube $eometry that has been de*ned for bank % 7- rows of shield tubes9 and bank + 7= rows of *nned tubes9!  You may also like to e"plore the detailed results! Look at &esults 0 &esults Summary 0 Overall Summary!

FiredHeater models in HYSYS

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Aspen Fired Heater Models Embedded in HYSYS Simulations

.ote that the peak tube metal temperature in the *rebo" here is $iven as 3035C .

In &esults 0 "alculation (etails 0 Stream (etails  you will *nd information for eah tube inludin$ alulated temperatures< heat transfer oe?ients and two' phase (ow patterns!

&ening the 'odeling .ow letDs re*ne our modellin$ approah! Clik on the simple HYSYS heatin$ utility and delete it! You may also whish to delete the ener$y stream assoiated with this unit operation! 8eturn to the ri$orous pre'heat train model we eleted to i$nore initially and un' hek the Ignored  bo"!  )he simulation may take a minute or so to onver$e! .ow lik on the Fired Heater  model and $o to the 1or%sheet tab! You will see that the pressure of the warm rude has been spei*ed as well as the pressure for the hot rude leavin$ the heater! Aspen Fired Heater used these values to sale the pressure drop in the ri$orous model! .ow letDs delete the inlet pressure value and allow *red heater to alulate what the inlet pressure would 7or ould9 be!

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Aspen Fired Heater Models Embedded in HYSYS Simulations

 )his may take some minutes to onver$e and shows that FiredHeater an ahieve the reuired outlet pressure if the >arm Crude was supplied at %-!%2 bar!

Heavier "rude 2lend .o letDs e"plore what would happen if we had to proess a heavier rude blend! Clik on the Assay Feeder  at the far left of the (owsheet! You will see the bend is %00@ Branian Heavy Crude! Set up the blend to ontain 0!2 Branian Heavy< 0!% Soroosh and the balane will automatially be made up of #etroleum Assay'%!

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Aspen Fired Heater Models Embedded in HYSYS Simulations  You may *nd it takes some time to onver$e with this han$e! You