08 apc softsensors cts

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February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation1

Process Engineering GroupProcess Engineering Group

Soft Sensors & Aspen IQSoft Sensors & Aspen IQ

7th Apr 20127th Apr 2012

Swetha Nair Swetha Nair




ScopeWhat are Soft Sensors

What is ASPEN IQ

Ho to bui!" Soft Sensors

Ho to up"ate soft sensors

Wor# f!o sheet for Soft sensor up"ation



February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation$

What are Soft Sensors%

&athe'atica! re!ation that ca!cu!ates or pre"icts a contro!!e" property

usin( other a)ai!ab!e process "ata

It is "ifferent fro' si'p!e re(ression because it captures "yna'ics, a!i(n

"ata * up"ate it se!f hi!e runnin(

Why use an soft sensor

It is either i'possib!e or e+tre'e!y cost!y to 'easure on!ine

&ay be use" as a bac#up to an e+istin( ana!y-er to.

/e"uce or e!i'inate "ea" ti'e, both fro' the process an" the ana!y-er

cyc!e

Pro)i"e re"un"ancy for a !i'ite" ti'e in case the ana!y-er is una)ai!ab!e



Aspen IQ Intro"uction

Flash Pt.

Freeze Pt.

95% Pt.

I

IPI

I

Stea!

I

I

95% Pt.

Stea!

I

IFreezePt.

FI

FIF"

F"

F"

F"

I F"

FI

Stea!

FI

FI F" I

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/efinin( E+a'p!e



February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation

E+a'p!es of Soft Sensors /efinery petro!eu' fractionators

Petro!eu' fraction boi!in( points IP, 304, 34, EP5

Petro!eu' fraction co!"7 properties f!ash, free-e, c!ou"5

8i(ht en"s "isti!!ation refinin( or petroche'ica!5

Pro"uct i'purity 90:

, 9;,

, etc<5

Po!y'er processes

&e!t in"e+ &I5 or 'e!t=f!o ratio &F/5

>ensity

E'issions &onitorin(

N?@, 9?, particu!ates




What is Aspen IQ% Aspen IQ is an Aspenech pro"uct hich pro)i"es a!! of the too!s to

bui!" an" i'p!e'ent inferentia! sensors in in"ustria! processes< he

pac#a(e contains of

IQ#o$el B to "e)e!op !inear P8S, Non B 8inear P8S, Hybri" Neura! Net or &onotonic

Neura! net &o"e!s

IQ"onfi to confi(ure the input an" output connections an" settin( the initia!

up"ates an" tunin( para'eters in an IQF fi!e

IQ#anae B for !oa"in( an" 'ana(in( an IQF ?n!ine.

IQ'(tra)t * for (atherin( "ata for use in "e)e!opin( 'o"e!s or for (enera! reportin(<

IQ+iew * for )iein( an" chan(in( )a!ues on!ine


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?n!ine

Pro)i"es both 8ab an" Ana!y-er )a!ue up"atin(

Wi"e ran(e of >9S in Infor'ati)e syste' interface a)ai!ab!e

No co"e (eneration or pro(ra''in( reDuire"

?ff!ine

roa" suits of poer too!s. P8S, Fu--y P8S, NN etc<

raphica! Ana!ysis too!s a)ai!ab!e. e)a!uation * )a!i"ation

oo!s such as. )ariab!e se!ection, "ea" ti'e esti'ation * "yna'ic

ana!ysis

What is Aspen IQ. ey Features


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Aspen IQ supports se)era! "ifferent 'o"e! types.

A!(ebraic eDuationbase" inferentia! sensors

P9, /FP9, PFP9 'ust be a stea"y state 'o"e!5

Finite I'pu!se /esponse FI/5 'o"e!s We "o not use 5

/e(ressionbase" 'o"e!s

Fre,-entl -se$, ASPEN IQ&?>E8 * P?WE/??8 reDuire"5

Non!inear 'o"e!s

ASPEN IQPoertoo!s to be use", Hybri" Neura! net * &onotonic Neura! Net to

be use"5

Firstprincip!e base" 'o"e!s 8inear ri(orous eDuation /?P5

What is Aspen IQ. techniDues


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Ho to ui!" Soft Sensors. ASPEN IQ

Inc!u"es si+ steps

Specify >ata A)ai!ab!e process )ariab!e, !ab=ana!y-er )a!ue5

9on"ition >ata spi#es, f!at !ine "etection, etc<5

A!i(n >ata Fin"in( out re!ate" "ata by esti'atin( "ea" ti'e5

Se!ect ariab!es Se!ectin( ri(ht )ariab!es fro' initia! !ist5

Ana!y-e >yna'ics 9orrectin( "yna'ics5

ui!" Inferentia! Sensor ui!"in( * "ep!oyin(5



IQ'o"e! Na)i(ation

/la) step

that

)an e $one

now

rae$o-t3 step that is $one in f-t-re

not )-rrentl an option



IQ'o"e!. Specify >ata

here are to ays in hich you can i'port "ata into Aspen

IQ'o"e!

>irect!y )ia startin( IQ'o"e! an" in)o#in( the Specify >ata step

y openin( an E+ce! or#sheet containin( your "ata an" in)o#in( the E+ce!

IQ'o"e! A""In

he choice of "ata entry 'etho" inf!uences hat type of or#in( fi!e

you use

If you i'port "irect!y throu(h IQ'o"e!, your or#in( fi!e is an IQ& fi!e

If you use the E+ce! A""In, your or#in( fi!e is the E+ce! sprea"sheet ith an

i'be""e" IQ'o"e! ProJect Fi!e obJect



IQ'o"e!. Specify >ata

Specifyin( )ariab!e type.

In"epen"ent

>epen"ent


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IQ'o"e!. Specify >ata ie


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IQ'o"e!. 9on"ition >ata

IQ " ! 9 "i i >



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IQ'o"e!. A!i(n >ata



February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation1G

IQ'o"e!. A!i(n >ata

>ata A!i(n'ent /esu!ts




IQ'o"e!. >ata A!i(n'ent /esu!ts




IQ'o"e!. Se!ect ariab!es




IQ'o"e!. Se!ect ariab!esariab!e Se!ection >ia!o(




IQ'o"e! Se!ect ariab!esForcin( a ariab!e Acti)e fro' the &ain >ia!o(



February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation2$

IQ'o"e!. Ana!y-e >yna'ics



February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation2;

ASPEN IQ&o"e!. /esu!t




Aspen IQ >ep!oy'ent Proce"ures

4se IQ)onfi to $efine inferential tpe -sin IQ!o$el file FI6

file or alerai) )al)-lation an$ )onne)t "S inp-ts an$

o-tp-ts

Kse IQ'ana(e to !oa" an" start the inferentia! sensor app!ications

Kse IQ)ie to 'onitor an" 'aintain the inferentia! sensor

app!ications

Kse IQe+tract to (enerate 989 or 9S fi!es for 'o"e! "e)e!op'ent

or 'aintenance

Soft sensor will pre$i)t the propert ase$ on other 8ariales

online




Ho to up"ate Soft sensors

Diesel End Point M1*1!M"*"!M#*#!M$*$!%&A'

361DSLEP_P362DSLEP_P

Diesel Inferred End Point

M1 PFPCT

T Tag 361TI600_P

P Tag 361PI060_P

StdP Constant 32

!at" Constant 136

"1 Constant 11#$2%

M2 Tag 361PDI06&_P

"2 Constant '16($(

M3 Tag 361FC0#3_P

"3 Constant '1&%23$

M& Tag 361FC0#1_P

"& Constant 2&&32%

)ias *+dated,nline

-./

Inferentia! nee"s to be up"ate" to o)erco'e "rift *

'o"e! error

ias i!! be ca!cu!ate" on!ine by (rabbin( the "ifference b= actua! an"

pre"icte" )a!ue E+a'p!e.



February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation2C


8KNK&A8S represents the nu'ber of pre)ious sa'p!es to beuse" hen up"atin( the !ab bias< In this case, e are set up to

use on!y the !ast !ab sa'p!e in the up"ate< Hoe)er, since this

)a!ue is 8?9A8, it is en(ineertunab!e<

8IASF/A9 is the fraction of the bias chan(e ca!cu!ate" by the

8K 'o"u!e to be app!ie" in co'putin( the ne bias< In this

case, e are app!yin( C4 of the bias chan(e< his para'eter is

a!so en(ineertunab!e<



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February 21, 2016 Reliance Technology Group – APC / RTO For Internal Circulation$;

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