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  • 1.
    Berglin, Niklas
    et al.
    RISE, Innventia.
    Tomani, Per
    RISE, Innventia.
    Salman, H.
    Svärd, S.H.
    Ąmand, L.-E.
    Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler2010In: TAPPI Journal, ISSN 0734-1415, Vol. 9, no 6, p. 24-30Article in journal (Refereed)
    Abstract [en]

    Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/ bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cof ¡ring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk. Application: This research is of interest for pulp and paper and energy and utilities companies that want to understand how kraft lignin can be used to replace fuel oil or coal in many combustion applications.

  • 2.
    Bialik, Marta
    et al.
    RISE, Innventia.
    Jensen, Anna
    RISE, Innventia.
    Ahlroth, Mikael
    RISE, Innventia.
    New challenges regarding nonprocess elements in the liquor and lime cycle2015In: TAPPI Journal, ISSN 0734-1415, Vol. 14, no 7, p. 421-429Article in journal (Refereed)
    Abstract [en]

    Optimal performance of the green liquor plant, recausticizing plant, and lime cycle is vital for adequate white liquor availability and quality as well as for a mill's energy efficiency. Recently, various problems in the liquor and lime cycle have been frequently reported by our industrial partners, including poor performance of green liquor filters or sludge filters, decreased filterability of lime mud, increased lime kiln dead load, and poorquality white liquor. Those problems are most likely caused by an accumulation of nonprocess elements in the liquor and lime cycle due to increased mill closure, increased use of biofuels, or both. Data from the literature and earlier studies have been analyzed with regard to the occurrence and concentration of nonprocess elements in various process streams, including filtered green liquor, green liquor sludge, lime mud, and white liquor. The mineral forms in which nonprocess elements often precipitate were also studied, together with the common knowledge and rules of thumb used by mills for dealing with the problems. The literature data are compared with the newest analytical results from a sampling campaign involving several mills with varying process solutions with respect to nonprocess elements. The consequences and possible recommendations for the mills are presented. Application: Kraft pulp mills can use this information to diagnose and possibly solve problems related to nonprocess elements in day-to-day mill operation.

  • 3. Bruun, H
    et al.
    Friberg, S
    YKI – Ytkemiska institutet.
    Studies on the interaction between tetrahydroabietic acid and ferric salt solutions1968In: TAPPI Journal, ISSN 0734-1415, Vol. 51, p. 482-488Article in journal (Refereed)
  • 4.
    Carlsson, Per
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
    Marklund, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
    Furusjö, Erik
    Wiinikka, Henrik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
    Gebart, Rikard
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Energy Technology Center.
    Experiments and mathematical models of black liquor gasification: Influence of minor gas components on temperature, gas composition, and fixed carbon conversion2010In: TAPPI Journal, ISSN 0734-1415, Vol. 9, no 9, p. 15-24Article in journal (Refereed)
    Abstract [en]

    In this work, predictions from a reacting Computational Fluid Dynamics (CFD) model of a gasification reactor are compared to experimentally obtained data from an industrial pressurized black liquor gasification plant. The data consists of gas samples taken from the hot part of the gasification reactor using a water cooled sampling probe. During the considered experimental campaign, the oxygen-to-black liquor equivalence ratio (λ was varied in three increments, which resulted in a change in reactor temperature and gas composition. The presented numerical study consists of CFD and thermodynamic equilibrium calculations in the considered λ-range using boundary conditions obtained from the experimental campaign. Specifically, the influence of methane concentration on the gas composition is evaluated using both CFD and thermodynamic equilibrium. The results show that the main gas components (H 2, CO, CO2) can be predicted within a relative error of 5% using CFD if the modeled release of H2S and CH4 are specified a priori. In addition, the calculations also show that the methane concentration has large influence on the reactor outlet temperature and final carbon conversion.

  • 5. Engström, G
    et al.
    Norrdahl, P
    Ström, G
    YKI – Ytkemiska institutet.
    Studies of the drying and its effect on binder migration and offset mottling1987In: TAPPI Journal, ISSN 0734-1415, Vol. 70, p. 45-49Article in journal (Refereed)
  • 6. Francey, S.
    et al.
    Tran, H.
    Berglin, N.
    RISE, Innventia.
    Global survey on lime kiln operation energy consumption and alternative fuel usage2011In: TAPPI Journal, ISSN 0734-1415, no 8, p. 19-26Article in journal (Refereed)
  • 7. Fälth, F
    et al.
    Jönsson, A-S
    Brinck, J
    YKI – Ytkemiska institutet.
    Wimmerstedt, R
    Ultrafiltration of bleach plant filtrate when using evaporation condensate as washing liquor2000In: TAPPI Journal, ISSN 0734-1415, Vol. 83, p. 74-Article in journal (Refereed)
  • 8.
    Jour, Pia
    et al.
    Akzo Nobel Pulp and Performance Chemicals, Sweden.
    Lindgren, Karin
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Gutke, Katarina
    Akzo Nobel Pulp and Performance Chemicals, Sweden.
    Walllinder, Johan
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Decreased water usage in a softwood ECF bleaching sequence: full mill simulations2018In: TAPPI Journal, ISSN 0734-1415, Vol. 17, no 6, p. 353-360Article in journal (Refereed)
    Abstract [en]

    In this study, an elemental chlorine free (ECF) bleach plant with a D0(EOP)D1(EP)D2 sequence was studied with the aim of identifying options for significantly decreasing (fresh) water usage in the bleach plant and decreasing the effluent volume. A base-case simulation model for a softwood kraft market pulp mill was made based on a reference model representing the best available techniques as well as data produced in an extensive  laboratory pulp bleaching study. This model was used to evaluate increased closure within the bleach plant and the recirculation of bleach plant effluent to the brownstock system and their effects on both the bleach plant and the recovery cycle. The results indicate that it is possible to reduce the fresh water consumption from 15 metric tons/a.d. metric ton in the base case to about 2 metric tons/a.d. metric ton, without increasing the carryover of chemical  oxygen demand (COD) to the pulp machine. Nonprocess elements in wood contribute to the levels of metals found in the bleach plant and thus to the risk of  precipitates such as calcium oxalate, barium sulfate, and calcium carbonate. The risk of precipitates forming is a key factor determining the possible degree of closure. In addition, chloride concentration in the black liquor is another important factor that is affected by recirculating bleach plant filtrate to the brownstock washer and by the grade of the sodium hydroxide used in the mill.

  • 9. Järnström, L
    et al.
    Ström, G
    Stenius, P
    YKI – Ytkemiska institutet.
    The adsorption of dispersing and thickening polymers and their effect on the rheology of coating colors1987In: TAPPI Journal, ISSN 0734-1415, Vol. 70, p. 101-107Article in journal (Refereed)
  • 10.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Fasci, Giuseppe Carmini
    KTH Royal Institute of Technology, Sweden.
    Norman, Bo
    RISE, Innventia.
    Prahl Wittberg, Lisa
    KTH Royal Institute of Technology, Sweden.
    Bridging chemical dosage, mixing quality, and variability in paper sheets2015In: TAPPI Journal, ISSN 0734-1415, Vol. 14, no 5, p. 311-320Article in journal (Refereed)
    Abstract [en]

    In the first part of this work, a series of paper production trials were performed on a forming experimental (FEX) pilot machine to investigate the distribution of additives in the final product. In these trials, a blue color was dosed into the stock before the headbox instead of a retention aid. Fine paper sheets were produced using twin-wire forming. Visual inspection of the sheets revealed surprisingly high levels of variability of the blue color. In the second part, the effect of different dosage nozzle configurations on downstream mixing quality of a single-component, polyacrylamide retention aid was studied using two-phase computational fluid dynamics. A non-Newtonian model for this phase was implemented using rheological parameters obtained through a combination of numerical and experimental analysis. Dosage was made into a turbulent pipe flow under typical industrial approach flow conditions. The effect of the number of dosage points, impingement angle, dosage location, and dosage speed on mixing uniformity was investigated qualitatively and quantitatively. Results from these studies indicate the existence of optimal dosage configurations and point toward strong coupling between chemical addition strategy, mixing quality, and chemical variability in final products. Application: Mills can gain valuable information, including dosage nozzle configuration and dosage conditions, for optimizing mixing of retention aids in the approach flow during paper production.

  • 11. Preston, J.
    et al.
    Hiorns, A. G.
    Elton, N.
    Ström, Göran
    RISE, STFI-Packforsk.
    Application of imaging reflectometry to studies of print mottle on commercially printed coated papers2008In: TAPPI Journal, ISSN 0734-1415, Vol. 7, no 1, p. 11-18Article in journal (Refereed)
    Abstract [en]

    It has been well documented that homogeneous coating structures are necessary for obtaining good, mottle-free printed papers. Methods such as mercury intrusion porosimetry are widely used in the paper industry, but will deliver a bulk porosity measure, which contains contributions from both the surface layers and the bulk of the coating. One way of assessing the surface porosity is to measure its effective refractive index (Rl) because the Rl measured is a combination of the material Rl and air. In this work three papers coated with PCC, kaolin, and GCC were Rl mapped using an imaging reflectometer. The data were then treated with a mathematical transform in order to be able to quantify the degree of variation that was taking place at each length scale. These results were then compared to the print mottle, which was evident after both lab scale printing and full scale sheetfed printing of the pilot coated papers. The commercial mottle was quantified both visually and using image analysis and there was a reasonable correlation between these two methods. In the halftone printed area, the propensity for mottle correlated with the degree of porosity variation of the coating. However, the rankings for the full tone print areas better correlated with the short time water absorbency of the coatings. FFT band-pass analysis confirmed that the same spatial distribution of unevenness occurred in the basepaper, coating layer and printed areas.

  • 12. Ragauskas, A. J.
    et al.
    Lindström, Tom
    RISE, Innventia, Material Processes.
    Nanocellulose and the future2014In: TAPPI Journal, ISSN 0734-1415, Vol. 13, no 5, p. 5-6Article in journal (Refereed)
  • 13. Ragauskas, A J
    et al.
    Lindström, Tom
    RISE, Innventia.
    Nanocellulose and the future2014In: TAPPI Journal, ISSN 0734-1415, Vol. 13, no 5, p. 06-majArticle in journal (Refereed)
  • 14.
    Roberts, K
    et al.
    YKI – Ytkemiska institutet.
    Österlund, R
    YKI – Ytkemiska institutet.
    Axberg, C
    YKI – Ytkemiska institutet.
    Liquid crystals in systems of rosin and fatty acids : implications for talloil recovery1976In: TAPPI Journal, ISSN 0734-1415, Vol. 59, p. 156-159Article in journal (Refereed)
  • 15.
    Stenius, P
    et al.
    YKI – Ytkemiska institutet.
    Kuortti, J
    Kronberg, B
    YKI – Ytkemiska institutet.
    Competitive adsorption phenomena in paper coatings1984In: TAPPI Journal, ISSN 0734-1415, Vol. 67, no 5, p. 56-59Article in journal (Refereed)
  • 16.
    Sterner, Marion
    et al.
    Research and Development for Gruppo X di X Gruppo Srl, Italy.
    Magnusson, Mikael
    RISE - Research Institutes of Sweden, Bioeconomy. RISE, Innventia.
    Innovative technology for making improved paper from the poorest fibers2017In: TAPPI Journal, ISSN 0734-1415, Vol. 16, no 11, p. 633-637Article in journal (Refereed)
    Abstract [en]

    The trademarked Papermorphosis technology, consisting of two novel units for separately increasing cross direction (CD) and machine direction (MD) elongation over purely mechanical processes, has been successfully tested on recycling fiber, reaching high elongation values in each direction of over 15% in CD or 20% in MD. Increase of elongation has also had a positive influence on the relative tensile energy absorption (TEA) values in CD and MD. It is well known that mechanical properties in paper basically depend on fiber choice, headbox properties, and refining. With the novel system, elongations in cross direction (CD) and machine direction (MD) can be individually customized, even in paper grades with lower strength deriving from recycled fiber. Customizing elongations also has the effect of improving or better balancing TEA values in both directions. The aim is to improve existing recycling papers and to broaden the use of recycling fiber with respect to the past.

  • 17. Vähä-Savo, N.
    et al.
    Demartini, N.
    Ziesig, R.
    RISE, Innventia.
    Tomani, P.
    RISE, Innventia.
    Theliander, H.
    Valimaki, E.
    Hupa, M.
    Combustion properties of reduced-lignin black liquors2014In: TAPPI Journal, ISSN 0734-1415, Vol. 13, no 8, p. 81-90Article in journal (Refereed)
  • 18. Vähä-Savo, Niklas
    et al.
    Demartini, Nikolai
    Ziesig, Rufus
    RISE, Innventia.
    Tomani, Per
    RISE, Innventia.
    Theliander, Hans
    RISE, Innventia.
    Välimäki, Erkki
    Hupa, Mikko
    Combustion properties of reduced-lignin black liquors2014In: TAPPI Journal, ISSN 0734-1415, Vol. 13, no 8, p. 81-90Article in journal (Refereed)
  • 19.
    Ziesig, Rufus
    et al.
    RISE, Innventia.
    Tomani, Per
    RISE, Innventia.
    Schweinebarth, Hannah
    RISE, Innventia.
    Norberg, Lars
    RISE, Innventia.
    Theliander, Hans
    RISE, Innventia.
    Production of a pure lignin product, part 1: Distribution and removal of inorganics in Eucalyptus globulus kraft lignin2014In: TAPPI Journal, ISSN 0734-1415, Vol. 13, no 3, p. 65-72Article in journal (Refereed)
1 - 19 of 19
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