Review: Reduction of energy consumption in TMP refining through mechanical pre-treatment of wood chips

Gorski, Dmitri; Hill, Jan; Engstrand, Per; Johansson, Lars

doi:10.3183/npprj-2010-25-02-p156-161

Cited by 34 publications

(26 citation statements)

References 2 publications

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“…In addition, energy demand can be decreased by reducing raw materials variability (Dundar et al 2009 ) or by changing the spout angle of wood chipper (Hellstr ö m et al 2011 ). In TMP production, however, other factors have been shown to decrease the energy demand, such as decreasing discharge consistency from the primary refiner, on a double-stage refiner (Alami et al 1997 ), increasing refining temperature/pressure (Muh í c et al 2010 ), and compressing chips before refining (Gorski et al 2010 shown to affect TMP process energy demand (Lanouette et al 2010 ). The studies regarding the understanding of the main variables affecting the refining energy demand, such as the chemical and morphologic structure of wood, are scarce.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical pulping of novel Brazilian Eucalyptus hybrids

Muguet¹,

Ruuttunen²,

Jääskeläinen³

et al. 2013

Holzforschung

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Abstract:The importance of Eucalyptus wood as a sustainable resource is well established. Mechanical pulp production is an energy-intensive process, and methods for decreasing energy demand are needed. In the present article, the structure of Eucalyptus hybrids and the produced pulps from the hybrids were assessed in terms of energy consumption, technical properties, and fiber morphology. The defibration and fiber development were investigated by traditional thermomechanical pulping in laboratory scale. There was no clear difference in the extent of defibration and fibrillation among the hybrids, with the exception of one hybrid (U2xGL1). Guaiacyl lignin contents of more than 7.2 % had a minor influence on energy consumption, and this finding is different from the results of previous studies on chemimechanical pulping processes. However, a low amount of guaiacyl lignin (6.1 % based on wood) decreased the energy demand. This assessment is of major importance concerning the energysaving defibration during thermomechanical pulping production.

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Section: Introductionmentioning

confidence: 99%

Thermomechanical pulping of novel Brazilian Eucalyptus hybrids

Muguet¹,

Ruuttunen²,

Jääskeläinen³

et al. 2013

Holzforschung

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“…In recent years, some low energy refining experiments have been based on process optimization (Senger et al 2006;Muhic et al 2010;Murton and Duffy 2005) and the aid of chemicals in sulphonation, carboxylation, oxidation, and enzymatic reactions (Johansson et al 2011;Kumar and Wyman 2009;Decker et al 2009). In those studies that involved refining, the focus was mainly on the refining equipment (Gorski et al 2010;Kure et al 1999), and there was less discussion on adjusting fiber morphology to reduce refining energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Energy Consumption and Morphological Development of Eucalyptus Alkaline Peroxide Mechanical Pulp by Carboxymethyl Cellulose-assisted Refining

Cheng¹,

Li²,

Chen³

2013

BioResources

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Carboxymethyl cellulose (CMC)-assisted refining was shown, by means of tests with a PFI mill, to have potential to save energy compared with conventional refining techniques. Previously it was thought that the energy-saving effect of CMC-assisted refining was caused by resultant lubrication that reduced friction. In this work, the refined fiber of eucalyptus alkaline peroxide mechanical pulp was analyzed. The mechanism of CMC-assisted refining is that the cell wall is fibrillated to peel and weaken cell wall strength. Then CMC permeates into the cell wall and swells it, and the fiber becomes more pliable. CMC-assisted refining is helpful in maintaining fiber length through resultant hydration to avoid more fiber cutting. In this work, fiber morphological changes in the course of PFI refining for different numbers of revolutions were shown in relation to CMC-assisted refining. The purpose of the research was to determine whether energy savings could be achieved by CMCassisted refining and to study its influence on fiber morphological development. The study showed a linear relationship between fiber length and energy consumption, as well as an exponential relationship between fines and fiber length. These results are helpful for obtaining ideal fiber morphology in pulp and paper making, man-made board, natural nano-fibers and specialty fibers, and the food industry.

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“…In the Nordic countries, a larger share of paper production uses mechanical pulp than anywhere else in the world (Ruohonen, Ahtila 2011). Energy-efficient refining has been an important research subject for a long period of time (Engstrand et al 2003;Engstrand et al 1989;Gorski et al 2010;Höglund et al 1994;Muhic et al 2010;Norgren, Höglund 2009;Sabourin 1999). The institute of Fibre Science and Communication Network (FSCN) at Mid Sweden University, together with Scandinavian forest and supplier companies, the Pulp and Paper Research Institute (PFI), and other Scandinavian universities, is working with a large research program with the goal of showing how to design the TMP and CTMP mills of the future.…”

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confidence: 99%

Techno-economic evaluation of a mechanical pulp mill with gasification

Engstrand

Björkqvist

et al. 2013

Nordic Pulp &Amp; Paper Research Journal

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SUMMARY: Mechanical pulping processes, including thermomechanical pulp (TMP), groundwood (SGW and PGW), and chemithermomechanical pulp (CTMP) processes, each have a very high wood-to-pulp yield. Producing pulp by means of these processes is a prerequisite for paper (such as printing paper and paperboard) grades requiring high printability and stiffness. However, mechanical pulping processes consume a great amount of electricity, which may account for up to 40% of the total pulp production cost. In mechanical pulping mills, wood (biomass) residues are commonly utilized for electricity production through an associated combined heat and power (CHP) plant. This techno-economic evaluation deals with the possibility of utilizing a biomass integrated gasification combined cycle (BIGCC) plant in place of the CHP plant. Implementing BIGCC in a mechanical pulp production line might greatly improve the overall energy efficiency and cost-effectiveness, especially when more biomass from forest (such as branches and tree tops) is available. When the fibre material that negatively affects pulp properties is utilized as a bioenergy resource, the overall efficiency will be further improved. A TMP+BIGCC mathematical model is developed with ASPEN Plus. By means of modeling, three cases are studied: 1) adding more forest biomass logging residues in the gasifier, 2) adding the reject fibres in the gasifier, and 3) decreasing the TMP-specific electricity consumption (SEC) by up to 50%. For a TMP+BIGCC mill, the energy supply and consumption are analyzed in comparison with a TMP+CHP mill. The production profits are evaluated. ADDRESSES OF THE AUTHORS

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Review: Reduction of energy consumption in TMP refining through mechanical pre-treatment of wood chips

Cited by 34 publications

References 2 publications

Thermomechanical pulping of novel Brazilian Eucalyptus hybrids

Thermomechanical pulping of novel Brazilian Eucalyptus hybrids

Energy Consumption and Morphological Development of Eucalyptus Alkaline Peroxide Mechanical Pulp by Carboxymethyl Cellulose-assisted Refining

Techno-economic evaluation of a mechanical pulp mill with gasification

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