Consequences in a softwood kraft pulp mill of initial high alkali concentration in the impregnation stage

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Fältnamn	Indikatorer	Metadata
000		03521naa a2200469 4500
001		oai:DiVA.org:ri-37837
003		SwePub
008		190228s2019 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
009		oai:DiVA.org:ri-50065
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-378372 URI
024	7	a https://doi.org/10.1515/npprj-2018-00262 DOI
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-500652 URI
040		a (SwePub)ri
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Brännvall, Elisabetu RISE,Bioraffinaderi och energi,Massa, papper och förpackningar4 aut0 (Swepub:ri)elisabet.brannvall@ri.se
245	1 0	a Consequences in a softwood kraft pulp mill of initial high alkali concentration in the impregnation stage
264		c 2019-02-13
264	1	b Walter de Gruyter GmbH,c 2019
338		a electronic2 rdacarrier
520		a 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.
650	7	a TEKNIK OCH TEKNOLOGIERx Materialteknikx Pappers-, massa- och fiberteknik0 (SwePub)205032 hsv//swe
650	7	a ENGINEERING AND TECHNOLOGYx Materials Engineeringx Paper, Pulp and Fiber Technology0 (SwePub)205032 hsv//eng
653		a Delignification
653		a Impregnation
653		a Softwood
653		a effective alkali
653		a kraft cooking
653		a simulation model; pulp mill
653		a yield
700	1	a Kulander, Idau RISE,Bioraffinaderi och energi4 aut
710	2	a RISEb Bioraffinaderi och energi4 org
773	0	t Nordic Pulp & Paper Research Journald : Walter de Gruyter GmbHg 34:1, s. 28-35q 34:1<28-35x 0283-2631x 2000-0669
856	4	u https://doi.org/10.1515/npprj-2018-0026y Fulltext
856	4	u https://www.degruyter.com/view/j/npprj.ahead-of-print/npprj-2018-0026/npprj-2018-0026.xml
856	4	u https://ri.diva-portal.org/smash/get/diva2:1292556/FULLTEXT01.pdfx primaryx Raw objecty fulltext:print
856	4	u https://www.degruyter.com/downloadpdf/journals/npprj/34/1/article-p28.pdf
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-37837
856	4 8	u https://doi.org/10.1515/npprj-2018-0026
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-50065

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