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1.	Jansson, Johan, et al. (author) On-line simulation of continuous pulp digester 2009 In: TAPPSA Journal. Journal article (peer-reviewed)abstract 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.

Jansson, Johan, et al. (author)
On-line simulation of continuous pulp digester
2009
In: TAPPSA Journal.
Journal article (peer-reviewed)abstract
- 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.

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