Modelling of the Prehydrolysis Kraft Process for Process Control

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussa

Standard

Modelling of the Prehydrolysis Kraft Process for Process Control. / Lahnalammi, Antton; Sixta, Herbert; Jämsä-Jounela, Sirkka-Liisa.

Proceedings of the 21st Nordic Process Control Workshop. 2018. s. 92-96.

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussa

Harvard

Lahnalammi, A, Sixta, H & Jämsä-Jounela, S-L 2018, Modelling of the Prehydrolysis Kraft Process for Process Control. julkaisussa Proceedings of the 21st Nordic Process Control Workshop. Sivut 92-96, Nordic Process Control Workshop, Turku, Suomi, 18/01/2018.

APA

Lahnalammi, A., Sixta, H., & Jämsä-Jounela, S-L. (2018). Modelling of the Prehydrolysis Kraft Process for Process Control. teoksessa Proceedings of the 21st Nordic Process Control Workshop (Sivut 92-96)

Vancouver

Lahnalammi A, Sixta H, Jämsä-Jounela S-L. Modelling of the Prehydrolysis Kraft Process for Process Control. julkaisussa Proceedings of the 21st Nordic Process Control Workshop. 2018. s. 92-96

Author

Bibtex - Lataa

@inproceedings{d404dd92d9214af6b4cab9825314730c,
title = "Modelling of the Prehydrolysis Kraft Process for Process Control",
abstract = "Prehydrolysis kraft process adds a separate prehydrolysis stage prior to traditional kraft batch cooking cycle in order to selectively remove portion of the wood hemicelluloses. The removal of hemicellulose is unavoidably accompanied by adverse reactions, most importantly partial hydrolysis amorphous alpha-cellulose and release of condensation prone acid soluble lignin. On-line monitoring of the reactions is missing, and only available signals from the digester are the temperature and pressure profiles. This paper presents a mechanistic dynamic model for the prehydrolysis stage, which approximates the progression of the unmeasured reactions based on the energy and component balances determined for individual digester sub-sections. Energy balance is determined for solids, liquid fraction and the walls inside each section, while the reaction rates are modelled for liquid and solid fractions in each section using second order kinetics. The model can be used directly for the control and optimization of the process or for the development and testing of soft sensors and novel control strategies.",
keywords = "autohydrolysis, batch digester, mechanistic model, dynamic model",
author = "Antton Lahnalammi and Herbert Sixta and Sirkka-Liisa J{\"a}ms{\"a}-Jounela",
year = "2018",
month = "1",
language = "English",
pages = "92--96",
booktitle = "Proceedings of the 21st Nordic Process Control Workshop",

}

RIS - Lataa

TY - GEN

T1 - Modelling of the Prehydrolysis Kraft Process for Process Control

AU - Lahnalammi, Antton

AU - Sixta, Herbert

AU - Jämsä-Jounela, Sirkka-Liisa

PY - 2018/1

Y1 - 2018/1

N2 - Prehydrolysis kraft process adds a separate prehydrolysis stage prior to traditional kraft batch cooking cycle in order to selectively remove portion of the wood hemicelluloses. The removal of hemicellulose is unavoidably accompanied by adverse reactions, most importantly partial hydrolysis amorphous alpha-cellulose and release of condensation prone acid soluble lignin. On-line monitoring of the reactions is missing, and only available signals from the digester are the temperature and pressure profiles. This paper presents a mechanistic dynamic model for the prehydrolysis stage, which approximates the progression of the unmeasured reactions based on the energy and component balances determined for individual digester sub-sections. Energy balance is determined for solids, liquid fraction and the walls inside each section, while the reaction rates are modelled for liquid and solid fractions in each section using second order kinetics. The model can be used directly for the control and optimization of the process or for the development and testing of soft sensors and novel control strategies.

AB - Prehydrolysis kraft process adds a separate prehydrolysis stage prior to traditional kraft batch cooking cycle in order to selectively remove portion of the wood hemicelluloses. The removal of hemicellulose is unavoidably accompanied by adverse reactions, most importantly partial hydrolysis amorphous alpha-cellulose and release of condensation prone acid soluble lignin. On-line monitoring of the reactions is missing, and only available signals from the digester are the temperature and pressure profiles. This paper presents a mechanistic dynamic model for the prehydrolysis stage, which approximates the progression of the unmeasured reactions based on the energy and component balances determined for individual digester sub-sections. Energy balance is determined for solids, liquid fraction and the walls inside each section, while the reaction rates are modelled for liquid and solid fractions in each section using second order kinetics. The model can be used directly for the control and optimization of the process or for the development and testing of soft sensors and novel control strategies.

KW - autohydrolysis

KW - batch digester

KW - mechanistic model

KW - dynamic model

M3 - Conference contribution

SP - 92

EP - 96

BT - Proceedings of the 21st Nordic Process Control Workshop

ER -

ID: 17151270