Development of soft sensors for advanced control of isomerization process

doctoral thesis

• Title (croatian): Razvoj softverskih senzora za napredno vođenje procesa izomerizacije
• Author: Srečko Herceg
• Mentor: Nenad Bolf (mentor)
• Committee member: Igor Dejanović (predsjednik povjerenstva)
• Committee member: Željka Ujević Andrijić (član povjerenstva)
• Committee member: Željko Šitum (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Analysis, Synthesis and Management of Chemical Processes
• Universal decimal classification (UDC): 66 - Chemical technology. Chemical and related industries ; 004 - Computer science and technology. Computing. Data processing

Abstract

This doctoral thesis presents the development of soft sensor empirical models using support vector machine (SVM), and dynamic polynomial models for the continual estimation of the mole fractions of 2,2-dimethylbutane, 2,3-dimethylbutane, 2-methylpentane and 3-methylpentane as important product quality indicators in a refinery isomerisation process. During the model development, critical steps were taken, including selection and preprocessing of the industrial process data, which are broadly discussed in this thesis. Evaluation of the developed models on independent data sets and their implementation in the system for the advanced process control showed their reliability in estimating of the component contents. The soft sensors will serve primarily as a replacement during the process analysers’ failure and service periods, as well as it will be a part of advanced control of isomerisation process.

Abstract (croatian)

Ovaj doktorski rad predstavlja razvoj empirijskih modela softverskih senzora korištenjem metode potpornih vektora i dinamičkih polinomnih modela. Senzori su namijenjeni kontinuiranoj procjeni molnog udjela 2,2-dimetilbutana, 2,3-dimetilbutana, 2-metilpentana i 3-metilpentana kao ključnih komponenti u proizvodu rafinerijskog procesa izomerizacije. Tijekom razvoja modela, poduzeti su ključni koraci kao što su izbor i predobrada procesnih podataka, što je naširoko objašnjeno u ovom radu. Vrednovanje razvijenih modela na nezavisnim skupovima podataka i njihova implementacija u sustav za napredno vođenje procesa pokazalo je njihovu pouzdanost u procjeni udjela navedenih komponenti u proizvodu procesa. Softverski senzori prvenstveno će služiti kao zamjena tijekom kvara procesnih analizatora te u servisnim periodima, kao što će biti i dio naprednog vođenja procesa izomerizacije.

• Keywords: advanced control; dynamic polynomial model; isomerisation process; process analyser; soft sensor; support vector machine
• Keywords (croatian): napredno vođenje; dinamički polinomni model; proces izomerizacije; procesni analizator; softverski senzori; metoda potpornih vektora
• Language: english
• URN:NBN: urn:nbn:hr:149:615263
• Promotion: 2021
• Study programme: Title: Chemical Engineering and Applied Chemistry - Doctoral course; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti, polje kemijsko inženjerstvo (doktor/doktorica znanosti, područje tehničkih znanosti, polje kemijsko inženjerstvo)
• Type of resource: Text
• Extent: 155 str. ; 30 cm
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-06-01 12:15:56