Eemeli Hytönen

Polytechnique Montréal, Montréal, Quebec, Canada

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Publications (8)3.73 Total impact

  • Eemeli Hytönen · Paul Stuart
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    ABSTRACT: Biorefinery process design generally follows the principles of traditional chemical process design, however some unique characteristics of the forest biorefinery (FBR), especially the large number of distinct strategies and current process development stage, causes significant uncertainty in process design decision making.This paper examines the challenges in the analysis of FBR techno-economic performance under uncertain conditions. It briefly reviews different methods used in process design uncertainty analysis, and the strengths and weaknesses of commonly used risk analysis methods. Moreover, the use of risk analysis in selected recent forest biorefinery design studies is reviewed.A case study is presented in which Monte Carlo analysis is used in screening different biofuel retrofit FBR design alternatives.
    No preview · Article · Dec 2011 · Computer Aided Chemical Engineering
  • E. Hytönen · P. Stuart
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    ABSTRACT: A set of financial performance criteria that are suitable for retrofit forest biorefinery project appraisal are presented. A systematic quantification of performance factors has potential for making better informed decisions for biofuel development. Forest biorefinery strategies can potentially have a better financial return as the result of retrofit implementation into existing facilities; however the extent of this benefit is mill specific. Moreover, process integration leads to changes in production costs of core business pulp and paper products. Several metrics can be used for measuring project and business performance, for example economic potential, payback period, return on investment, gross profit, minimum selling price, internal rate of return (IRR) or net present value (NPV). Revenue diversification, operating performance and cost reduction are important factors for the overall ranking.
    No preview · Article · Oct 2011
  • Eemeli Hytönen · Richard Phillips · Paul R. Stuart
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    ABSTRACT: AIChE 2010. Session: Integrated Processes for Biochemical Conversion of Renewable Feedstocks to Fuels and Chemicals
    No preview · Article · Nov 2010
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    Eemeli Hytönen · Paul R. Stuart
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    ABSTRACT: Journal of Biobased Materials and Bioenergy Vol.4 Nr.1, 58-67 Lignocellulosic biorefinery processes for biofuel production are developing rapidly but their commercialization may still take some years. Incorrectly identifying the most promising technologies from the existing options based on their current development stage, estimated future costs of plant construction, prices of raw materials and end products poses a risk of making less favourable decisions. To mitigate these risks in design decision making, technical- and market-based uncertainties should be considered in techno-economic assessments. Monte Carlo analysis can be used in a systematic technology identification approach to account for these risks in preliminary screening of integrated forest biorefinery options. This paper will discuss the large block analysis approach including uncertainty estimations with Monte Carlo simulation. The results of using this approach in a case study to investigate the feasibility of integrated biofuel production from several raw materials with several technologies at a North American integrated kraft pulp and paper mill are also discussed. These results will help this mill to select the right technology, or combination of technologies, for further consideration in the context of biofuel production.
    Preview · Article · Mar 2010 · Journal of Biobased Materials and Bioenergy
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    E Hytönen · P R Stuart
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    ABSTRACT: Both thermochemical and sugar process technologies can convert lignocellulosic raw materials into ethanol. To identify economically feasible solutions using these technologies, while the final decision should be based on a more extensive set of criteria, simple after-tax Internal Rate of Return (IRR) can be used as a selection criterion. In this paper, several integrated forest biorefinery design alternatives have been evaluated for an integrated kraft pulp and paper mill. Based on prices and raw material availability, as well as published information about biorefinery processes, it was clear in this particular case study that corn ethanol is the most feasible option. It provides an IRR of over 20% at larger plant capacities. Following the corn ethanol option, thermochemical mixed alcohol synthesis routes also have interesting economics.
    Preview · Article · May 2009 · Pulp and Paper Canada -Ontario-
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    ABSTRACT: This article introduces a bottom-up global model of the pulp and paper sector (PULPSIM) with a focus on energy consumption and carbon emissions. It is an annual recursive simulation behavioural model with a 2030 time horizon incorporating several technological details of the industry for 47 world regions. The long time horizon and the modular structure allow the model users to assess the effects of different environmental, energy and climate policies in a scenario comparison setup. In addition to the business as usual developments of the sector, a climate commitment scenario has been analysed, in which the impacts of changing forest management practices are also included. The climate scenario results reveal that there is a significant carbon reduction potential in the pulp and paper making, showing a number of specific features: the central role of the fibrous resource inputs and the potential impact of increased waste wood and black liquor based heat generation.
    No preview · Article · May 2009 · Environmental Science & Policy
  • Eemeli Hytönen · P. R. Stuart
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    ABSTRACT: TAPPSA Journal Nr.November, 17-24, 35
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    E Hytönen · T Puumalainen
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    ABSTRACT: The need to increase paper production capacity and simultaneously the quality of the paper is achieved among others by intensifying the performance of the paper machine drying section. To test new and improve existing drying concepts good simulation tools and experimental measurements are needed. Dryer simulator built on basis of a commercial mass-and energy balance simulator BALAS ® is described. It is capable of simulating traditional cylinder, new combined cylinder/through fabric and direct impingement drying configurations accurately. A paper mill integrate was simulated to make energy concept considerations of impingement drying rebuilds and new installations.
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