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Publications (5)0.83 Total impact

  • 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
    11/2010;
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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.
    Journal of Biobased Materials and Bioenergy 03/2010; · 0.83 Impact Factor
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    E Hytönen, P R Stuart
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    ABSTRACT: This study focuses on assessing the profitability of bioethanol production using different process technologies. This enables the selection of prom-ising ethanol production options, but does not consider the relative economic attractiveness of producing other biofuels and bioproducts. To assess the production and capital invest-ment costs of ethanol biorefineries, as well as the impacts on environment and the supply chain, process systems engineering (PSE) tools can be used. Tools such as process simulation cost model-ling, life cycle assessment (LCA), and supply chain management (SCM) all have their place in the analysis of biorefinery implementation strategies. Since the economic aspects are in many cases the dominating final decision making criteria, system-atic methods are needed to evaluate and compare different IFBR options to demonstrate to the for-est industry and policy makers the profitability of biofuel production. Literature review Raw material availability and cost plays a key role in high volume biofuel production. It varies significantly on a national and even on a regional level, and therefore biorefinery solutions are loca-tion-dependent. Perhaps the best known example of comprehensive raw material assessment is the "billion-ton vision" from the U.S. Department of Energy [1]. The data and other information used in this assessment are public and have been used in several state-level assessments that are useful for mill-level decision making in the U.S. [2, 3]. It has been recognized that raw material cost is an important factor in biorefining. "Process improve-ment invariably makes the cost of raw material the dominant factor in overall refinery economics" is lthough fossil-based transporta-tion fuel prices have plunged quickly after having skyrocketed during 2008, the environmental awareness and goals for fossil fuel use and emissions reduction have not been forgotten. Also, other aspects, such as energy security and the opportunity to increase revenues by manufacturing products based on biomass in general, continue to provide strong motivation. Forestry companies are seeking improved profits from the implementation of new and sustainable business models, and one serious strategy exploits the concept of biorefining. Bioethanol production as a biorefinery objec-tive is very popular. It is volume-wise the most produced bio-product in the world after pulp and paper products, and its demand is rising due in good part to government legislation and policies. The food-fuel dispute has led to increasing inter-est in lignocellulosic biorefineries, but in order to fulfil the demand using these feedstocks, new and existing technologies need to be further developed and integrated with existing ones. One promising option is the integrated forest biorefinery (IFBR). The forest industry has access to the most abundant biomass resource. The IFBR can provide the forest industry both prod-uct portfolio diversification, and at the same time, reduced pulp and paper product production costs, to help companies survive the current difficult markets, and possibly even prosper into the future. Bioethanol, and other bioalcohols and biofuels, can subsequently be used as raw material for the production of value-added derivative bioproducts. This could be the next step for forest industry companies to further diversify their product port-folio and generate additional revenues.
  • Eemeli Hytönen, P. R. Stuart
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    ABSTRACT: TAPPSA Journal Nr.November, 17-24, 35
  • 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.