Qualitative analysis of a thermo mechanical pulp and paper mill using advanced composite curves

Ruohonen, Pekka; Ahtila, Pekka

doi:10.1016/j.energy.2010.09.043

Cited by 8 publications

(2 citation statements)

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“…Earlier studies have shown large potentials for generating a steam surplus, and introducing different biorefinery concepts, in the chemical PPI [1][2][3][4][5][6][7][8][9][10]. For the mechanical PPI, potentials for steam savings and temperature levels of excess heat have been identified for thermo-mechanical (TMP) model mills [11,12] and for a few real TMP and ground wood (GW) mills [13][14][15][16][17][18]. However, for the mechanical PPI, research regarding the potential for introduction of biorefinery concepts based on identified steam savings and excess heat levels has not been performed previously.…”

Section: Introductionmentioning

confidence: 99%

The potential for steam savings and implementation of different biorefinery concepts in Scandinavian integrated TMP and paper mills

Jönsson

Ruohonen

Michel

et al. 2011

Applied Thermal Engineering

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International audienceIn this paper the potential for steam savings and excess heat levels is analysed for four Scandinavian thermo-mechanical (TMP) pulp and paper mills, using the Heat Load Model for Pulp and Paper (HLMPP). The results are compared with similar results from previous studies for two other TMP mills. Further, an analysis is made regarding the relationship between the steam consumption and temperature level of excess heat and mill-specific characteristics such as production rate and fresh warm water usage. Based on the results and the analysis, the potential for implementation of different biorefinery concepts is discussed. The results indicate that steam savings of 2-20% can be found in Scandinavian TMP mills. The pinch temperature is rather low, around 20-70°C for most of the studied mills, compared to the pinch temperature usually found at kraft pulp mills (100-140°C). Further, two of the mills show an un-pinched Grand Composite Curve (GCC) where the heat demand curve starts close to 0°C. Thus the potential utilization options for the excess heat are rather limited. The results also show that the level of heated fresh water affects both the steam consumption and the pinch temperature, and thus the potential for efficient integration of different biorefinery processe

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Section: Introductionmentioning

confidence: 99%

The potential for steam savings and implementation of different biorefinery concepts in Scandinavian integrated TMP and paper mills

Jönsson

Ruohonen

Michel

et al. 2011

Applied Thermal Engineering

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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).…”

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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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Energy and Exergy Transfer Diagrams for Visualising Flows in Process Systems

Walmsley

2023

Process Integr Optim Sustain

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Qualitative analysis of a thermo mechanical pulp and paper mill using advanced composite curves

Cited by 8 publications

References 4 publications

The potential for steam savings and implementation of different biorefinery concepts in Scandinavian integrated TMP and paper mills

The potential for steam savings and implementation of different biorefinery concepts in Scandinavian integrated TMP and paper mills

Techno-economic evaluation of a mechanical pulp mill with gasification

Energy and Exergy Transfer Diagrams for Visualising Flows in Process Systems

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