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Selecting the most appropriate products for the forest biorefinery

Industrial Biotechnology 2007年第2期3卷 112-119页

作者： Chambost, Virginie Stuart, Paul R. NSERC Environmental Design Engineering Department of Process Integration Department of Chemical Engineering Ecole Polytechnique Montréal Que. Canada

The forest biorefinery offers a business strategy that potential forestry companies are seriously considering for improving the overall financial performance of the sector;however, there are considerable technology and business risks related to its implementation. These risks can be mitigated to a great extent by using systematic product and process design tools for analyzing biorefinery strategies. This paper describes the basis for a systematic product design methodology for Rapid Market Analysis, suitable for evaluating the economic and commercial potential of a biorefinery project, using a set of business tools that includes market and synergy identification. The preliminary application of this methodology has illustrated that the longer-term competitive advantage of companies implementing the biorefinery is unlikely to be related to technology, but rather, related to the unique supply chain that companies put in place, coupled with manufacturing flexibility.

关键词： Forestry

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Guided tour: Implementing the forest biorefinery (fbr) at existing pulp and paper mills

Guided tour: Implementing the forest biorefinery (fbr) at ex...

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engineering, Pulping and environmental Conference 2008, TAPPI

作者： Chambost, V. McNutt, J. Stuart, P.R. NSERC Environmental Design Engineering Chair in Process Integration Department of Chemical Engineering École Polytechnique - Montreal Canada Institute of Paper Science and Technology Georgia Institute of Technology Atlanta United States

ISBN: (纸本)9781605605081

The forest biorefinery (FBR) is being considered by many forest product companies as an option for improving their business models. FBR implementation implies significant challenges for mills related to key technological, economical, financial, cultural, and operational risks - and most importantly, related to enterprise transformation (ET). Product platform definition needs to be systematically considered in order to develop sustainable biorefinery strategies, which in turn precipitates corporate transformation while increasing overall profits. Foundation concepts with regards to ET and product design are presented in this paper. A hypothetical "guided tour" is given for the biorefinery implementation for the production of ethanol, in which a phased approach is proposed, and key issues that a given mill should consider for implementing the FBR are highlighted.

关键词： Product design

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Strategic approach to co-generation design

Strategic approach to co-generation design

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91st Annual Meeting of the Pulp and Paper Technical Association of Canada

作者： Wising, Ulrika Berntsson, T. Riemer, K. Stuart, P. NSERC Environmental Design Engineering Chair in Process Integration Ecole Polytechnique de Montréal Montréal Canada Chalmers University of Technology Gothenburg Sweden KNRconsult Montréal Canada

When considering the installation of a co-generation facility in a Kraft pulp mill, it is important that one first perform a mill energy efficiency study and set tactical targets with regard to energy projects/opportunities prior to specifying the co-generation plant design specifications. For the best case, the Simple Payback Period is reduced from 5.4 to 2.5 years when energy consumption is reduced before installing co-generation. Also, on-site GHG emissions can be reduced if such an energy efficiency study is performed before installing co-generation.

关键词： Cogeneration plants

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Method for the analysis of paper machine web breaks

Method for the analysis of paper machine web breaks

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92nd Annual Meeting of the Pulp and Paper Technical Association of Canada (PAPTAC)

作者： Akrour, Fatiha Berton, Antoine Hebert, Pascal Perrier, Michel Stuart, Paul R. NSERC Environmental Design Engineering Process Integration Department of Chemical Engineering École Polytechnique Montréal QC Canada Abitibi-Consolidated Inc. Belgo Division Shawinigan QC Canada

ISBN: (纸本)1897023189

Paper machine breaks are costly, and their reduction is of critical importance to the mill's competitive position. A systematic methodology based on process risk analysis has been applied at an integrated newsprint mill with four paper machines, in order to identify breaks that can be related to discrete events in the stock approach system, which subsequently increase variability at the headbox. Binary logistic regression was used to establish probabilistic models for each of the 4 paper machines, with the goal of being able to predict web break occurrence. The models confirm that at this mill, the occurrence of about 10% of breaks can be related to headbox variability with reasonable confidence.

关键词： Headboxes

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Methodology for using real-time process data for supply chain optimization in the pulp and paper industry

Methodology for using real-time process data for supply chai...

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91st Annual Meeting of the Pulp and Paper Technical Association of Canada

作者： Laflamme-Mayer, Martin Linkewich, Jason Stuart, Paul R. NSERC Environmental Design Engineering Chair in Process Department of Chemical Engineering École Polytechnique de Montréal Fibre Supply Strategy Tembec Inc. Témiscaming Canada

With the implementation of mill-wide information management systems in the pulp and paper industry, process and cost data have become increasingly available. Careful analysis of this data and use of this data to model critical production processes can be useful tools for supply chain (SC) optimization. This paper presents a modeling approach which integrates both process and cost information from a pulp and paper mill. process-based costing is used to represent how resources are consumed by process activities, and how process activities are related to cost objects. The "bottom-up" business model approach presented in this study is illustrated for the optimization of pulp mill procurement and production cycles, for different levels of logistical management.

关键词： Paper and pulp industry

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Expected cost optimization using asymmetric probability density functions

Expected cost optimization using asymmetric probability dens...

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作者： Pigeon, Bertrand Perrier, Michel Srinivasan, Bala NSERC Environmental Design Engineering in Process Integration Department of Chemical Engineering École Polytechnique de Montréal C.P. 6079 Succ. Centre Ville Montréal QC H3C 3A7 Canada

ISBN: (纸本)9783902661548

In the stochastic context, expected value of the cost function is optimized either by changing the mean values of the manipulated variables or by reducing their variance. An extension is to look for an optimal shape for the entire probability density function (PDF). Though the use of asymmetric PDFs is proposed in the literature, no formal proof that justifies their use has been provided. In this paper, it is shown that an asymmetric PDF is required if and only if the cost function is asymmetric and the manipulated variable is penalised. The proof uses an analytical solution of the Fokker-Planck-Kolmogorov equation derived to calculate the shape the output PDF for scalar systems. In particular, this analytical solution is adapted to a switching proportional controller. The theoretical concepts are illustrated on a simulation example, where the advantage of choosing an asymmetric PDF is shown.

关键词： Probability density function

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Expected Cost Optimization using Asymmetric Probability Density functions

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IFAC Proceedings Volumes 2009年第11期42卷 744-749页

作者： Bertrand Pigeon Michel Perrier Bala Srinivasan NSERC Environmental Design Engineering Chair in Process Integration Department of Chemical Engineering école Polytechnique de Montréal C.P. 6079 Succ. Centre Ville Montréal Québec Canada H3C 3A7

Abstract In the stochastic context, expected value of the cost function is optimized either by changing the mean values of the manipulated variables or by reducing their variance. An extension is to look for an optimal shape for the entire probability density function (PDF). Though the use of asymmetric PDFs is proposed in the literature, no formal proof that justifies their use has been provided. In this paper, it is shown that an asymmetric PDF is required if and only if the cost function is asymmetric and the manipulated variable is penalised. The proof uses an analytical solution of the Fokker-Planck-Kolmogorov equation derived to calculate the shape the output PDF for scalar systems. In particular, this analytical solution is adapted to a switching proportional controller. The theoretical concepts are illustrated on a simulation example, where the advantage of choosing an asymmetric PDF is shown.

关键词： Stochastic control Optimization Probability Density Functions Switching Algorithms

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Energy system consequences when installing an advanced delignification process

Energy system consequences when installing an advanced delig...

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作者： Wising, Ulrika Berntsson, Thore Åsblad, Anders Department of Chemical Engineering NSERC Environmental Design Engineering Chair-Process Integration in the Pulp and Paper Industry École Polytechnique de Montréal Montréal Que. H3T 1J7 Canada Heat and Power Technology Department of Chemical and Biological Engineering Chalmers University of Technology Göteborg 412 96 Sweden CIT Industriell Energianalys AB Göteborg 412 88 Sweden

In the pulp and paper industry, during major modernization projects the overall energy system consequences are often not estimated in detail, usually only local energy consequences are taken into account when evaluating possible projects. In this paper, the effects on the overall energy system when installing an advanced delignification process (i.e., a "state-of-the- art" pulp digester and oxygen delignification process) will be presented. Also, the effect such an installation has on the potential for further energy integration is discussed. Furthermore, the CO2 consequences for both installing such a system and integrating the mill further energy-wise are presented.

关键词： Paper and pulp industry

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Strategic approach to co-generation design

Annual Meeting of the Pulp and Paper Technical Association o...

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Annual Meeting of the Pulp and Paper Technical Association of Canada (PAPTAC) 2005年 C卷 C83-C88页

作者： Wising, Ulrika Berntsson, T. Riemer, K. Stuart, P. NSERC Environmental Design Engineering Department of Process Integration Ecole Polytechnique de Montréal Montréal Canada Chalmers University of Technology Gothenburg Sweden KNRconsult Montréal Canada

When considering the installation of a co-generation facility in a Kraft pulp mill, it is important that one first perform a mill energy efficiency study and set tactical targets with regard to energy projects/opportunities prior to specifying the co-generation plant design specifications. For the best case, the Simple Payback Period is reduced from 5.4 to 2.5 years when energy consumption is reduced before installing cogeneration. Also, on-site GHG emissions can be reduced if such an energy efficiency study is performed before installing co-generation.

关键词： Cogeneration plants

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Identifying environmental improvement opportunities for newsprint production using Life Cycle Assessment (LCA)

Identifying environmental improvement opportunities for news...

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PAPTAC 91st Annual Meeting

作者： Salazar, Erica Samson, Réjean Munnoch, Ken Stuart, Paul R. NSERC Environmental Design Engineering Department of Process Integration École Polytechnique de Montréal Tembec - Spruce Falls Inc. Kapuskasing Ont. Department of Chemical Engineering École Polytechnique de Montréal succ. Centre Ville Montréal Que. Canada Tembec - Spruce Falls Inc. 1 Government Road Kapuskasing Ont. Canada

The goal of this study was to use LCA for the systematic identification and assessment of opportunities to improve the environmental performance of newsprint production. An LCA baseline model for the production of 1 admt newsprint from 80% IMP and 20% DIP was developed (Salazar et al, 2004) which included processes from wood extraction to newsprint distribution (i.e., cradle-to-gate). In this study, the model was modified to examine the impact from the implementation of additional DIP production capacity and co-generation at a integrated newsprint mill, in the context of potential energy benefits. Other than in a few cases, it was found that environmental benefits could be achieved in the product chain with these projects for most impact categories. In particular, a 20-40% reduction in Global Warming Potential was achieved. The importance of the power mix or fuel source for power generation (which varies with mill location) on the baseline model results was examined and found to be an important factor.

关键词： Newsprint

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