Control Strategy Scheme for the Prehydrolysis Kraft Process

Antton Lahnalammi; Herbert Sixta; Sirkka-Liisa Jämsä-Jounela

doi:10.1016/B978-0-444-64241-7.50102-6

Control Strategy Scheme for the Prehydrolysis Kraft Process

Antton Lahnalammi, Herbert Sixta, Sirkka-Liisa Jämsä-Jounela

Research output: Contribution to journal › Conference article › Scientific › peer-review

Abstract

This paper presents a control strategy scheme for the prehydrolysis stage in the prehydrolysis kraft process. The key element of the proposed control strategy is a softsensor, which estimates the rate of the unobservable reactions based on a physicochemical dynamic model of the process. The rate of hydrolysis depends on the wood temperature and hydrogen ion concentration, which can be calculated by estimating the reaction heat due to deacetylation of wood and subsequent wood component degradation reactions. The estimated hydrogen ion concentration and reaction enthalpies are combined with dynamic temperature profile and kinetic reaction models for estimation of the main quality parameters for dissolving pulp, namely the lignin content and the content and degree of polymerization of the alpha-cellulose fraction. The developed model is tested based on parameters approximated from the literature and the feasibility of the model for testing the suggested control strategy scheme is discussed.

Original language	English
Article number	102
Pages (from-to)	643 - 648
Number of pages	6
Journal	Computer Aided Chemical Engineering
Volume	44
Issue number	Part A
DOIs	https://doi.org/10.1016/B978-0-444-64241-7.50102-6
Publication status	Published - 2018
MoE publication type	A4 Article in a conference publication
Event	International Symposium on Process Systems Engineering - San Diego, San Diego , United States Duration: 1 Jul 2018 → 5 Jul 2018 Conference number: 13 https://pse2018.org/

Keywords

prehydrolysis kraft process
dissolving pulp
dynamic model
soft-sensor
model-based control

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10.1016/B978-0-444-64241-7.50102-6

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title = "Control Strategy Scheme for the Prehydrolysis Kraft Process",

abstract = "This paper presents a control strategy scheme for the prehydrolysis stage in the prehydrolysis kraft process. The key element of the proposed control strategy is a softsensor, which estimates the rate of the unobservable reactions based on a physicochemical dynamic model of the process. The rate of hydrolysis depends on the wood temperature and hydrogen ion concentration, which can be calculated by estimating the reaction heat due to deacetylation of wood and subsequent wood component degradation reactions. The estimated hydrogen ion concentration and reaction enthalpies are combined with dynamic temperature profile and kinetic reaction models for estimation of the main quality parameters for dissolving pulp, namely the lignin content and the content and degree of polymerization of the alpha-cellulose fraction. The developed model is tested based on parameters approximated from the literature and the feasibility of the model for testing the suggested control strategy scheme is discussed.",

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author = "Antton Lahnalammi and Herbert Sixta and Sirkka-Liisa J{\"a}ms{\"a}-Jounela",

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year = "2018",

doi = "10.1016/B978-0-444-64241-7.50102-6",

language = "English",

volume = "44",

pages = "643 -- 648",

journal = "Computer Aided Chemical Engineering",

issn = "1570-7946",

publisher = "Elsevier",

number = "Part A",

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TY - JOUR

T1 - Control Strategy Scheme for the Prehydrolysis Kraft Process

AU - Lahnalammi, Antton

AU - Sixta, Herbert

AU - Jämsä-Jounela, Sirkka-Liisa

N1 - Conference code: 13

PY - 2018

Y1 - 2018

N2 - This paper presents a control strategy scheme for the prehydrolysis stage in the prehydrolysis kraft process. The key element of the proposed control strategy is a softsensor, which estimates the rate of the unobservable reactions based on a physicochemical dynamic model of the process. The rate of hydrolysis depends on the wood temperature and hydrogen ion concentration, which can be calculated by estimating the reaction heat due to deacetylation of wood and subsequent wood component degradation reactions. The estimated hydrogen ion concentration and reaction enthalpies are combined with dynamic temperature profile and kinetic reaction models for estimation of the main quality parameters for dissolving pulp, namely the lignin content and the content and degree of polymerization of the alpha-cellulose fraction. The developed model is tested based on parameters approximated from the literature and the feasibility of the model for testing the suggested control strategy scheme is discussed.

AB - This paper presents a control strategy scheme for the prehydrolysis stage in the prehydrolysis kraft process. The key element of the proposed control strategy is a softsensor, which estimates the rate of the unobservable reactions based on a physicochemical dynamic model of the process. The rate of hydrolysis depends on the wood temperature and hydrogen ion concentration, which can be calculated by estimating the reaction heat due to deacetylation of wood and subsequent wood component degradation reactions. The estimated hydrogen ion concentration and reaction enthalpies are combined with dynamic temperature profile and kinetic reaction models for estimation of the main quality parameters for dissolving pulp, namely the lignin content and the content and degree of polymerization of the alpha-cellulose fraction. The developed model is tested based on parameters approximated from the literature and the feasibility of the model for testing the suggested control strategy scheme is discussed.

KW - prehydrolysis kraft process

KW - dissolving pulp

KW - dynamic model

KW - soft-sensor

KW - model-based control

U2 - 10.1016/B978-0-444-64241-7.50102-6

DO - 10.1016/B978-0-444-64241-7.50102-6

M3 - Conference article

VL - 44

SP - 643

EP - 648

JO - Computer Aided Chemical Engineering

JF - Computer Aided Chemical Engineering

SN - 1570-7946

IS - Part A

M1 - 102

T2 - International Symposium on Process Systems Engineering

Y2 - 1 July 2018 through 5 July 2018

ER -

Control Strategy Scheme for the Prehydrolysis Kraft Process

Abstract

Keywords

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