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On-line simulation of continuous pulp digester
Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling. (PRO)
Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling. (PRO)ORCID-id: 0000-0002-7233-6916
Mälardalens högskola, Akademin för ekonomi, samhälle och teknik. (MERO)ORCID-id: 0000-0001-8191-4901
2009 (engelsk)Inngår i: TAPPSA JournalArtikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Continuous cooking is the dominant process in the kraft pulping industry.  Our general knowledge and understanding of process conditions inside the digester is limited. Process control systems comprise of groups of measurements, which give information about conditions at the outer shell of the digester.  These measurements mostly tell about cooking liquor inflows and outflows, temperature and it is also possible to measure pressure or pressure difference at the screen section of the digester shell.  But ultimately process conditions inside the digester are based on measurements at the shell and intelligent approximations.

 

The aim of this paper is to describe more accurately the cooking conditions and phenomena inside the digester.  A model of a continuous digester was developed as an extension of the well known Purdue model [Bhartiya, 2003].  The model was adapted to simulate an industrial Lo-Solids pulp digester as well as an ITC digester.  The models were then used to do online predictions and these predictions were compared with the actual plant performance.

sted, utgiver, år, opplag, sider
2009.
Emneord [en]
modelling, simulation, on-line, pulp digester
HSV kategori
Forskningsprogram
energi- och miljöteknik
Identifikatorer
URN: urn:nbn:se:mdh:diva-8005OAI: oai:DiVA.org:mdh-8005DiVA, id: diva2:293127
Prosjekter
KKS Use of statistical and physical models for on-line optimizationTilgjengelig fra: 2010-02-10 Laget: 2010-02-10 Sist oppdatert: 2015-11-12bibliografisk kontrollert
Inngår i avhandling
1. Process Modeling of Combustion and Digesters for On-line Applications
Åpne denne publikasjonen i ny fane eller vindu >>Process Modeling of Combustion and Digesters for On-line Applications
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The use of biomass has increased in recent years due to the efforts to reduce the high emissions of greenhouse gases, primarily carbon dioxide from combustion of fossil fuels. At the same time industrial processes have become more complex because of increased production rates and profitability requirements. A higher degree of automation is needed when the processes are too complex to be handled manually. There is a need to find modeling strategies that can automatically handle the challenges that the conversion of biomass in an industrial process entails, such as operational changes, decreasing component and overall system efficiency, drifting sensors, etc. The objective of this thesis is to develop a methodology for on-line applications in industrial processes. Dynamic process models have been developed for continuous digesters and boilers. Process models have been evaluated for their use in continuous industrial process. Applications that have been studied are monitoring and diagnostics, advanced control and decision support. The process models are designed for on-line simulations. The results shows that the use of mathematical simulation models can improve the use of both process data and process understanding, to achieve improved diagnostics, advanced control and process optimization. In the two examples of industrial processes covered in this thesis, we can see that similar types of models can be used for completely different types of processes, such as pulp digesters and boilers. It also demonstrates the ability to combine soft sensors and hard sensors with physical models to take the information to a higher level of utilization.

sted, utgiver, år, opplag, sider
Västerås: Mälardalen University, 2015
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 194
HSV kategori
Forskningsprogram
energi- och miljöteknik
Identifikatorer
urn:nbn:se:mdh:diva-29462 (URN)978-91-7485-244-8 (ISBN)
Disputas
2015-12-15, R2-025, Mälardalens högskola, Västerås, 08:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2015-11-12 Laget: 2015-11-11 Sist oppdatert: 2015-11-25bibliografisk kontrollert

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