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Consequences in a softwood kraft pulp mill of initial high alkali concentration in the impregnation stage
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.ORCID iD: 0000-0002-8992-3623
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
2019 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 34, no 1, p. 28-35Article in journal (Refereed) Published
Abstract [en]

Impregnation with high initial concentration is fast and efficient, leading to a homogeneous delignification in the subsequent cook, resulting in improved screened pulp yield. To obtain high initial alkali concentration, the white liquor flow needs to be significantly increased. The moisture content of the wood chips and the alkali concentration of the white liquor limit the initial alkali concentration of the impregnation liquor that can be reached. It is therefore of interest to evaluate the possibility to implement high alkali impregnation (HAI) industrially and the consequences this would have on the mill system. The effect of HAI on mass and energy balances in a kraft pulp mill has been studied using mill model simulations. The sensitivity to disturbances in important parameters for process control has been compared to impregnation scenarios used industrially. It was shown that high initial alkali concentration can be achieved on industrial scale by increased white liquor flow. HAI has a positive effect on recovery flows and reduces the need for make-up chemicals. The HAI concept is less sensitive to variations in process parameters, such as chip moisture and white liquor concentration, thus diminishing the risk of alkali depletion in chip cores. © 2019 Brännvall and Kulander.

Place, publisher, year, edition, pages
2019. Vol. 34, no 1, p. 28-35
Keywords [en]
Delignification, Impregnation, Softwood, effective alkali, kraft cooking, simulation model; pulp mill, yield
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-37837DOI: 10.1515/npprj-2018-0026Scopus ID: 2-s2.0-85061696612OAI: oai:DiVA.org:ri-37837DiVA, id: diva2:1292556
Available from: 2019-02-28 Created: 2019-02-28 Last updated: 2019-03-05Bibliographically approved

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Brännvall, Elisabet

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