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J. Paris - One of the best experts on this subject based on the ideXlab platform.
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unified methodology for thermal energy efficiency improvement application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateosespejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Unified methodology for thermal energy efficiency improvement: Application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Energy implications of water reduction strategies in Kraft Process. Part II: Results.
2010Co-Authors: Enrique Mateos-espejel, Mariya Marinova, S. Bararpour, J. ParisAbstract:A new systematic methodology has been developed to study interactions between water and energy in the Kraft pulping Process and has been applied to an operating mill. The methodology, which can be used to find appropriate strategies for water consumption reduction and which also considers their impacts on the thermal energy efficiency of the Process, has been described in Part I of this paper. A case study was subse - quently performed and the results are presented in Part II. Four strategies that simultaneously reduce water, steam and cooling requirements are analyzed. Potential savings are significant.
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Systems interactions analysis for the energy efficiency improvement of a Kraft Process
Energy, 2010Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:Several techniques are available to improve the energy performance of a Process (internal heat recovery, water reutilization, condensates return, energy upgrading and conversion, elimination of non-isothermal mixing). They are applied to specific energy systems on the utility or Process side (steam production and distribution, hot or cold water networks, Process heat sources and sinks). Since those systems are interconnected, actions taken on one of them may have effects on another. These effects can be positive (synergies) or negative (counter-actions). A systematic, stepwise methodology has been developed to ensure that synergies are exploited and counter-actions avoided, and is presented. It has been validated by application to an existing Kraft pulping mill. Key performance indicators and the evolution of the thermal composite curves were used to monitor progress as the successive steps of the methodology were implemented. It was found that the combined direct and indirect effects of water reutilization constituted the most important source of potential energy savings. Water reutilization also reduced the need for additional purchased heat exchanger area. Overall, the water intake by the mill could be reduced by 33% and steam savings could be 26% of current production. This would liberate sufficient steam production capacity for the installation of a 44.4 MW cogeneration unit.
Enrique Mateos-espejel - One of the best experts on this subject based on the ideXlab platform.
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Energy efficiency improvement of a Kraft Process through practical stack gases heat recovery
Applied Thermal Engineering, 2011Co-Authors: B. Mostajeran Goortani, Enrique Mateos-espejel, Maryam Moshkelani, Jean ParisAbstract:Abstract A Process scheme for the optimal recovery of heat from stack gases considering energy and technical constraints has been developed and applied to an existing Kraft pulping mill. A system based on a closed loop recirculation of hot oil is used to recover the heat from stack gases and distribute it to the appropriate cold streams. The recovery of heat from stack gases is part of an overall optimization of the Kraft mill. Tools such as Pinch Analysis and exergy analysis are used to evaluate the Process streams. The results indicate that 10.8 MW of heat from stack gases can be reused to heat Process streams such as the deaerator water, hot water, drying filtrates, and black liquor. A simulation model of the recirculation loop has been developed to determine the specifications of the recovery system. The total heat exchanger surface area required by the system is 3460 m 2 , with a hot oil recirculation temperature of 137 °C. The anticipated total investment is $10.3 M, with a payback time of 1.8 years.
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Unified methodology for thermal energy efficiency improvement: Application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Energy implications of water reduction strategies in Kraft Process. Part II: Results.
2010Co-Authors: Enrique Mateos-espejel, Mariya Marinova, S. Bararpour, J. ParisAbstract:A new systematic methodology has been developed to study interactions between water and energy in the Kraft pulping Process and has been applied to an operating mill. The methodology, which can be used to find appropriate strategies for water consumption reduction and which also considers their impacts on the thermal energy efficiency of the Process, has been described in Part I of this paper. A case study was subse - quently performed and the results are presented in Part II. Four strategies that simultaneously reduce water, steam and cooling requirements are analyzed. Potential savings are significant.
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Systems interactions analysis for the energy efficiency improvement of a Kraft Process
Energy, 2010Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:Several techniques are available to improve the energy performance of a Process (internal heat recovery, water reutilization, condensates return, energy upgrading and conversion, elimination of non-isothermal mixing). They are applied to specific energy systems on the utility or Process side (steam production and distribution, hot or cold water networks, Process heat sources and sinks). Since those systems are interconnected, actions taken on one of them may have effects on another. These effects can be positive (synergies) or negative (counter-actions). A systematic, stepwise methodology has been developed to ensure that synergies are exploited and counter-actions avoided, and is presented. It has been validated by application to an existing Kraft pulping mill. Key performance indicators and the evolution of the thermal composite curves were used to monitor progress as the successive steps of the methodology were implemented. It was found that the combined direct and indirect effects of water reutilization constituted the most important source of potential energy savings. Water reutilization also reduced the need for additional purchased heat exchanger area. Overall, the water intake by the mill could be reduced by 33% and steam savings could be 26% of current production. This would liberate sufficient steam production capacity for the installation of a 44.4 MW cogeneration unit.
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DEVELOPMENT OF A STRATEGY FOR ENERGY EFFICIENCY IMPROVEMENT IN A Kraft Process BASED ON SYSTEMS INTERACTIONS ANALYSIS
2009Co-Authors: Enrique Mateos-espejelAbstract:RESUME L’objectif de ce projet de recherche est de developper, valider et appliquer une methodologie unifiee qui considere les interactions des systemes qui affectent la performance energetique du procede Kraft et permet d’en ameliorer l’efficacite. Le developpement d’une strategie d’implantation des mesures d’economie d’energie est le resultat final. L’usine qui fait l’objet de cette etude et situee dans l’est du Canada et produit environ 700 adt/d de pâte Kraft blanchie. L’industrie des pâtes et papiers est une des principales industries canadiennes ainsi qu’un des plus gros consommateurs d’eau et de d’energie du secteur industriel. La hausse des couts energetiques et les reglementations environnementales ont amene l’industrie a reorienter ses efforts pour developper des programmes de conservation d’eau et d’energie. Ces deux elements sont generalement analyses separement, cependant ils sont fortement interdependants. Par consequent, une methodologie qui considere l’eau, l’energie ainsi que la production et l’utilisation d’utilitaires est necessaire. La methodologie developpee comprend quatre etapes successives. La premiere est la definition et la caracterisation du procede, car la mise a disposition d’un modele de simulation fiable et representatif est essentielle a l’optimisation energetique. Une procedure qui inclut quatre volets est proposee: la collecte de donnees, la construction du diagramme de procede, l’analyse des systemes utilitaires, et le developpement de la simulation. Les systemes d’eau et d’energie sont les axes principaux de la simulation. La deuxieme etape de la methodologie est l’evaluation de l’efficacite energetique actuelle. Le but est d’identifier les inefficacites du procede et d’etablir des directives pour le developpent des mesures d’amelioration. L’efficacite du procede est evaluee par comparaison avec la pratique industrielle et l’application de nouveaux indicateurs energetiques et exergetiques. Les besoins minimums d’energie et d’eau du procede sont aussi determines lors de cette etape. La troisieme etape, qui comprend la definition des mesures d’economie d’energie techniquement faisables, est le noyau de la methodologie. Plusieurs techniques sont appliquees dans une procedure iterative pour mettre en evidence les synergies existantes. L’objectif est d’ameliorer le procede en maximisant les economies d’energie et en minimisant l’investissement requis. La quatrieme etape est l’implantation de la strategie.----------ABSTRACT The objective of this thesis is to develop, validate, and apply a unified methodology for the energy efficiency improvement of a Kraft Process that addresses globally the interactions of the various Process systems that affect its energy performance. An implementation strategy is the final result. An operating Kraft pulping mill situated in Eastern Canada with a production of 700 adt/d of high-grade bleached pulp was the case study. The Pulp and Paper industry is Canada’s premier industry. It is characterized by large thermal energy and water consumption. Rising energy costs and more stringent environmental regulations have led the industry to refocus its efforts toward identifying ways to improve energy and water conservation. Energy and water aspects are usually analyzed independently, but in reality they are strongly interconnected. Therefore, there is a need for an integrated methodology, which considers energy and water aspects, as well as the optimal utilization and production of the utilities. The methodology consists of four successive stages. The first stage is the base case definition. The development of a focused, reliable and representative model of an operating Process is a prerequisite to the optimization and fine tuning of its energy performance. A four-pronged procedure has been developed: data gathering, master diagram, utilities systems analysis, and simulation. The computer simulation has been focused on the energy and water systems. The second stage corresponds to the benchmarking analysis. The benchmarking of the base case has the objectives of identifying the Process inefficiencies and to establish guidelines for the development of effective enhancement measures. The studied Process is evaluated by a comparison of its efficiency to the current practice of the industry and by the application of new energy and exergy content indicators. The minimum energy and water requirements of the Process are also determined in this step. The third stage is the core of the methodology; it represents the formulation of technically feasible energy enhancing options. Several techniques are applied in an iterative procedure to cast light on their synergies and counter-actions. The objective is to develop a path for improving the Process so as to maximize steam savings while minimizing the investment required. The fourth stage is the implementation strategy.
R Tapias - One of the best experts on this subject based on the ideXlab platform.
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soda anthraquinone Kraft and organosolv pulping of holm oak trimmings
Bioresource Technology, 2006Co-Authors: J Alaejos, Francisco Jose Martinez Lopez, M E Eugenio, R TapiasAbstract:The operating conditions for an organosolv (ethyleneglycol) and two alkaline (soda-anthraquinone and Kraft) Processes for obtaining cellulose pulp and paper from holm oak (Quercus ilex) wood trimmings were optimized. A range of variation for each Process variable (viz. temperature, cooking time and soda or ethyleneglycol concentration) was established and a central composite experimental design involving three independent variables at three different variation levels was applied. The results obtained with the three cooking Processes used were compared and those provided by the Kraft Process were found to be the best. Thus, the tensile index values it provided (5.9-16.3 N m/g) were 23.7% and 41.5% better than those obtained with the soda-AQ and ethyleneglycol Processes, respectively. Also, the Kraft Process provided the best burst index, brightness and kappa number values. Based on the optimum working ranges, the temperature and cooking time were the variables resulting in the most and least marked changes, respectively, in pulp properties.
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Soda–anthraquinone, Kraft and organosolv pulping of holm oak trimmings
Bioresource technology, 2005Co-Authors: J Alaejos, Francisco Jose Martinez Lopez, M E Eugenio, R TapiasAbstract:The operating conditions for an organosolv (ethyleneglycol) and two alkaline (soda-anthraquinone and Kraft) Processes for obtaining cellulose pulp and paper from holm oak (Quercus ilex) wood trimmings were optimized. A range of variation for each Process variable (viz. temperature, cooking time and soda or ethyleneglycol concentration) was established and a central composite experimental design involving three independent variables at three different variation levels was applied. The results obtained with the three cooking Processes used were compared and those provided by the Kraft Process were found to be the best. Thus, the tensile index values it provided (5.9-16.3 N m/g) were 23.7% and 41.5% better than those obtained with the soda-AQ and ethyleneglycol Processes, respectively. Also, the Kraft Process provided the best burst index, brightness and kappa number values. Based on the optimum working ranges, the temperature and cooking time were the variables resulting in the most and least marked changes, respectively, in pulp properties.
Francois Marechal - One of the best experts on this subject based on the ideXlab platform.
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unified methodology for thermal energy efficiency improvement application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateosespejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Unified methodology for thermal energy efficiency improvement: Application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Systems interactions analysis for the energy efficiency improvement of a Kraft Process
Energy, 2010Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:Several techniques are available to improve the energy performance of a Process (internal heat recovery, water reutilization, condensates return, energy upgrading and conversion, elimination of non-isothermal mixing). They are applied to specific energy systems on the utility or Process side (steam production and distribution, hot or cold water networks, Process heat sources and sinks). Since those systems are interconnected, actions taken on one of them may have effects on another. These effects can be positive (synergies) or negative (counter-actions). A systematic, stepwise methodology has been developed to ensure that synergies are exploited and counter-actions avoided, and is presented. It has been validated by application to an existing Kraft pulping mill. Key performance indicators and the evolution of the thermal composite curves were used to monitor progress as the successive steps of the methodology were implemented. It was found that the combined direct and indirect effects of water reutilization constituted the most important source of potential energy savings. Water reutilization also reduced the need for additional purchased heat exchanger area. Overall, the water intake by the mill could be reduced by 33% and steam savings could be 26% of current production. This would liberate sufficient steam production capacity for the installation of a 44.4 MW cogeneration unit.
Luciana Savulescu - One of the best experts on this subject based on the ideXlab platform.
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unified methodology for thermal energy efficiency improvement application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateosespejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Unified methodology for thermal energy efficiency improvement: Application to Kraft Process
Chemical Engineering Science, 2011Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:A unified methodology that can be used to identify the interactions between the utilities systems and the Process, as well as their impacts on the implementation of energy efficiency measures is presented. It takes into account steam and water systems to analyze the Process and formulate energy enhancement measures. It has been applied to an operating Kraft mill in Eastern Canada. The methodology consists of five stages: base-case Process definition and characterization, pre-benchmarking, systems interactions analysis, implementation strategy and post-benchmarking. A simulation focused on the energy and water systems is first developed and used as basis of the analysis. The pre-benchmarking characterizes the current energy efficiency of the Process by three techniques: energy and exergy content indicators, comparison to the current industrial practice and establishing targets for minimum energy and water requirements determined by the Thermal Pinch and Water Pinch methods. The systems interactions are analyzed to develop complementary energy efficiency measures by applying several energy enhancing techniques. A three-phase strategy is proposed to implement the identified measures. The application of the unified methodology results in an eco-friendly Process that does not require fossil fuel for steam production and generates revenues by producing green electricity from biomass. In the case study presented, very significant energy gains have been proposed (26.6% steam requirement reduction and 33.6% fresh water intake reduction).
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Systems interactions analysis for the energy efficiency improvement of a Kraft Process
Energy, 2010Co-Authors: Enrique Mateos-espejel, Luciana Savulescu, Francois Marechal, J. ParisAbstract:Several techniques are available to improve the energy performance of a Process (internal heat recovery, water reutilization, condensates return, energy upgrading and conversion, elimination of non-isothermal mixing). They are applied to specific energy systems on the utility or Process side (steam production and distribution, hot or cold water networks, Process heat sources and sinks). Since those systems are interconnected, actions taken on one of them may have effects on another. These effects can be positive (synergies) or negative (counter-actions). A systematic, stepwise methodology has been developed to ensure that synergies are exploited and counter-actions avoided, and is presented. It has been validated by application to an existing Kraft pulping mill. Key performance indicators and the evolution of the thermal composite curves were used to monitor progress as the successive steps of the methodology were implemented. It was found that the combined direct and indirect effects of water reutilization constituted the most important source of potential energy savings. Water reutilization also reduced the need for additional purchased heat exchanger area. Overall, the water intake by the mill could be reduced by 33% and steam savings could be 26% of current production. This would liberate sufficient steam production capacity for the installation of a 44.4 MW cogeneration unit.
