Evaluation of future pulp mill concepts – Reference model of a modern Nordic kraft pulp mill

Kangas, Petteri; Kaijaluoto, Sakari; Määttänen, Marjo

doi:10.3183/npprj-2014-29-04-p620-634

Cited by 28 publications

(23 citation statements)

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“…47%, a level that has remained unchanged for many years (Janson and Teder 1986;Gullichsen 1999;Kangas et al 2014). There is a theoretical potential for higher yields in view of the fact that softwoods contain around 70% polysaccharides.…”

Section: Introductionmentioning

confidence: 99%

Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage

Brännvall

Bäckström²

2016

Holzforschung

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Abstract:A pulp yield increase up to 2% can be achieved by impregnation with a liquor containing 2 M effective alkali (EA) concentration instead of 1 M. The yield increase is due to higher cellulose and glucomannan contents in the pulp, which can be rationalized by less yield loss by peeling, as impregnation is more effective at an elevated EA level. A rapid loading of chips with alkali can be realized due to a high diffusion rate. When the temperature becomes higher in the cooking stage, enough alkali is available for delignification reactions without the risk of alkali depletion in the chip core, so that the delignification is more homogeneous.

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Section: Introductionmentioning

confidence: 99%

Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage

Brännvall

Bäckström²

2016

Holzforschung

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“…Especially in Nordic countries, wood raw material comprises up to 90% of the variable costs per produced air dry tonne of pulp and over half of the total production costs in a modern pulp mill (Kangas et al, 2014). Thus, savings from improved raw material utilisation and additional revenue from increased pulp production would be expected.…”

Section: The Halt Process As a Base Of A Biorefinery: Possibilities Amentioning

confidence: 98%

High-alkali low-temperature polysulfide pulping (HALT) of Scots pine

Paananen

Sixta

2015

Bioresource Technology

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“…In the pulp and paper industry, steady state simulation has been applied to optimize water consumption [20,21], minimize energy and utility consumption [22][23][24], and evaluate the chemical state of the process [25,26]. Kangas et al [27] defined a steady state simulation model of a kraft pulp mill and evaluated the economic feasibility of the process. In the field of biorefineries, steady state simulation has been used for process modelling and evaluating the economic performance of biomethane [28], bioethanol [29], biodiesel [30], and renewable diesel production [31].…”

Section: Steady State Simulationmentioning

confidence: 99%

Towards Semi-Automatic Generation of a Steady State Digital Twin of a Brownfield Process Plant

et al. 2020

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Researchers have proposed various models for assessing design alternatives for process plant retrofits. Due to the considerable engineering effort involved, no such models exist for the great majority of brownfield process plants, which have been in operation for years or decades. This article proposes a semi-automatic methodology for generating a digital twin of a brownfield plant. The methodology consists of: (1) extracting information from piping and instrumentation diagrams, (2) converting the information to a graph format, (3) applying graph algorithms to preprocess the graph, (4) generating a simulation model from the graph, (5) performing manual expert editing of the generated model, (6) configuring the calculations done by simulation model elements and (7) parameterizing the simulation model according to recent process measurements in order to obtain a digital twin. Since previous work exists for steps (1–2), this article focuses on defining the methodology for (3–5) and demonstrating it on a laboratory process. A discussion is provided for (6–7). The result of the case study was that only few manual edits needed to be made to the automatically generated simulation model. The paper is concluded with an assessment of open issues and topics of further research for this 7-step methodology.

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Evaluation of future pulp mill concepts – Reference model of a modern Nordic kraft pulp mill

Cited by 28 publications

References 0 publications

Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage

Improved impregnation efficiency and pulp yield of softwood kraft pulp by high effective alkali charge in the impregnation stage

High-alkali low-temperature polysulfide pulping (HALT) of Scots pine

Towards Semi-Automatic Generation of a Steady State Digital Twin of a Brownfield Process Plant

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