Aaron Bojarski - Academia.edu (original) (raw)
Papers by Aaron Bojarski
Green Energy and Technology, 2011
This chapter begins with an introduction to the different possible metrics related to clean gas p... more This chapter begins with an introduction to the different possible metrics related to clean gas process synthesis and its subsequent usage. Latter, the different techniques for tackling with multiple criteria are presented, emphasising the use of multi-criteria decision analysis (MCDA) and multi-objective optimisation (MOO). The different criteria elected here for optimisation are described and later used as key performance indicators (KPI) for the proposed scenarios, in chapter “Selection of Best Designs for Specific Applications”. Finally, a case study related to the operation of an IGCC plant considering coal–petcoke or natural gas as a fuel is assessed applying the optimization concepts introduced here and taking into account the operation considerations developed in this and in previous chapters.
Green Energy and Technology, 2011
The present chapter assembles all the previous chapter’s concepts and methodologies with the aim ... more The present chapter assembles all the previous chapter’s concepts and methodologies with the aim of selecting a given process design. The developed superstructure is used to simulate scenarios with different feedstocks and process topologies for co-production of electricity and hydrogen. The most representative output data are shown, and the described points of view, discussed in chapter “Global Clean Gas Process
Green Energy and Technology, 2011
The pressure on reducing environmental footprint is facilitating the emergence of energy supply c... more The pressure on reducing environmental footprint is facilitating the emergence of energy supply chains that have biomass as main feedstock. For the development of efficient energy supply chains from biomass it is required to properly integrate the various elements that comprise such systems (e.g., biomass supply, pre-treatment facilities and technologies for biomass to energy and/or fuels conversion). Additionally, it is
Green Energy and Technology, 2011
... The other are pyrolysis, hydrothermal and fermentation-based [1]. On the one hand, syngas ...... more ... The other are pyrolysis, hydrothermal and fermentation-based [1]. On the one hand, syngas ...Catalytic conversions outside the gasifier are representative type of processes intensification, since they ... in the case of gasification, steam addition and moisture content in the biomass. ...
Syngas from Waste, 2011
Syngas generation refers to the production of a synthetic or synthesis gas that is mainly compose... more Syngas generation refers to the production of a synthetic or synthesis gas that is mainly composed of CO and H2, in different proportions according to the generation process used and the raw material composition. Gasification is the referred technique to produce syngas. It can be used for different purposes, such as power and/or heat generation or for chemicals and fuels
Industrial & Engineering Chemistry Research, 2009
Industrial & Engineering Chemistry Research, 2008
... Jiménez ‡ , Antonio Espuña † and Luis Puigjaner* †. Department of Chemical Engineering, Pol... more ... Jiménez ‡ , Antonio Espuña † and Luis Puigjaner* †. Department of Chemical Engineering, Polytechnic University of Catalunya, 08028 Barcelona, Spain, and Department of Chemical Engineering, University of Rovira i Virgili, 43007 Tarragona, Spain. Ind. Eng. Chem. Res. ...
Energy, 2009
This work develops a design and operation support tool for an Integrated Gasification Combined Cy... more This work develops a design and operation support tool for an Integrated Gasification Combined Cycle (IGCC) power plant, which allows the efficiency and environmental issues of alternative process designs and feedstock to be assessed. The study is based on a conceptual model of an IGCC plant, validated with data from the ELCOGAS power plant in Spain. The layout of the
Computers & Chemical Engineering, 2009
Computers & Chemical Engineering, 2010
Several authors have pointed out the need to identify the optimum operating conditions (OCs) of a... more Several authors have pointed out the need to identify the optimum operating conditions (OCs) of autothermal thermophilic aerobic digestion (ATAD). This study proves the hypothesis that the OCs have the potential to substantially improve the energy efficiency and plant capacity of established ATAD systems. As ATAD is a semi-batch process, its energy efficiency has to be optimized via dynamic optimization (DO). This methodology requires an adequate mathematical model, and appropriate selection of optimization variables. The paper presents an improved mathematical ATAD model based on previous models found in the literature. A global sensitivity analysis (GSA) was performed in order to identify variables with significant influence upon energy efficiency and plant capacity, thus paving the way for the DO of ATAD systems. The results of the GSA show that reactor volume, reactor temperature, and aeration flowrate are significant variables, which is consistent with reported literature. The results of the GSA also show that both energy efficiency and plant capacity of ATAD systems can be substantially improved by altering reactor volume and OCs.
Dans un mode de realisation, un procede de purification d'un alcool aromatique consiste a : p... more Dans un mode de realisation, un procede de purification d'un alcool aromatique consiste a : polymeriser en masse fondue un compose a fonction dihydroxy et un compose a fonction carbonate en presence d'un catalyseur de transesterification pour former l'alcool aromatique et un polycarbonate dans une installation de polymerisation en masse fondue ; eliminer l'alcool aromatique dans un flux de tete ; separer le flux de tete dans une unite de purification d'alcool aromatique en un flux d'alcool aromatique purifie, comprenant l'alcool aromatique, et en un flux de fond d'unite de purification ; separer le flux de fond d'unite de purification dans une unite de purification de carbonate de diaryle en un flux de carbonate de diaryle et en un flux de fond d'unite de purification de carbonate de diaryle ; et craquer un compose dans le flux de fond d'unite de purification de carbonate de diaryle, dans une unite de craqueur, en presence d'un agent d...
Tdx, Jan 31, 2011
La consulta d'aquesta tesi queda condicionada a l'acceptació de les següents condicions d'ús: La ... more La consulta d'aquesta tesi queda condicionada a l'acceptació de les següents condicions d'ús: La difusió d'aquesta tesi per mitjà del servei TDX (www.tesisenxarxa.net) ha estat autoritzada pels titulars dels drets de propietat intel•lectual únicament per a usos privats emmarcats en activitats d'investigació i docència. No s'autoritza la seva reproducció amb finalitats de lucre ni la seva difusió i posada a disposició des d'un lloc aliè al servei TDX. No s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant al resum de presentació de la tesi com als seus continguts. En la utilització o cita de parts de la tesi és obligat indicar el nom de la persona autora. ADVERTENCIA. La consulta de esta tesis queda condicionada a la aceptación de las siguientes condiciones de uso: La difusión de esta tesis por medio del servicio TDR (www.tesisenred.net) ha sido autorizada por los titulares de los derechos de propiedad intelectual únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con finalidades de lucro ni su difusión y puesta a disposición desde un sitio ajeno al servicio TDR. No se autoriza la presentación de su contenido en una ventana o marco ajeno a TDR (framing). Esta reserva de derechos afecta tanto al resumen de presentación de la tesis como a sus contenidos. En la utilización o cita de partes de la tesis es obligado indicar el nombre de la persona autora. WARNING. On having consulted this thesis you're accepting the following use conditions: Spreading this thesis by the TDX (www.tesisenxarxa.net) service has been authorized by the titular of the intellectual property rights only for private uses placed in investigation and teaching activities. Reproduction with lucrative aims is not authorized neither its spreading and availability from a site foreign to the TDX service. Introducing its content in a window or frame foreign to the TDX service is not authorized (framing). This rights affect to the presentation summary of the thesis as well as to its contents. In the using or citation of parts of the thesis it's obliged to indicate the name of the author Life cycle thinking and general modelling contribution to chemical process sustainable design and operation Life cycle thinking and general modelling contribution to chemical process sustainable design and operation
Biomass can contribute to centralized and / or distributed energy systems, depending on its intri... more Biomass can contribute to centralized and / or distributed energy systems, depending on its intrinsic characteristics, and meet the different user needs. It can be supplied as a liquid, solid or gas energy carrier [1]. The electricity generation sector today needs to reduce its environmental impact and coal dependence. In terms of immediacy and cost of the solution, co-combustion of biomass and coal is presented as an alternative of transition, towards a renewable energy sector [2,3,4]. The use of biomass in large centralized systems, requires the establishment of supply channels to provide adequate feedstocks with the necessary attributes. Hence, there is a need for methods to evaluate the effective introduction of this type of projects in the energy market, to help policy makers and investors in clarifying the potential of biomass and biomass waste in particular. The purpose of this work is to investigate the application of a supply chain management approach in providing biomass, ...
This work aims at analyzing the significant environmental issues associated to production process... more This work aims at analyzing the significant environmental issues associated to production process scheduling. The implementation of a LCA for a given process or product requires the gathering of data regarding process environmental interventions (e.g. raw material consumption, uncontrolled emissions and waste generation). This set of data is organized in a life cycle inventory (LCI) which is the basis for the environmental impact calculation, as specified in the ISO 1404X series. In this work we aim at generating the required process LCI by means of a mathematical programming model. Multicriteria optimization of a mathematical process model representation is considered to obtain the optimal production schedules from both economical and environmental points of view. Peer Reviewed Postprint (published version)
Computer Aided Chemical Engineering, 2015
Abstract In this work a framework for the combined assessment of economic and environmental impac... more Abstract In this work a framework for the combined assessment of economic and environmental impact was developed for an industrial application. The method was tested for a reactive distillation (RD) process that is used for the production of fatty acid esters. The method integrates three stages, first the optimization goals are set and the system is modeled accordingly, secondly a sensitivity analysis is performed, the collected data is lastly interpreted using Pareto analysis and rank and proximity criteria. For the RD case study the sensitivity analysis showed that the catalyst requirement influences the economic impact and that the impact of wastewater treatment is the key component for the environmental impact. From the Pareto analysis recommendations concerning the design of the column can be made (in terms of operational pressure and number of stages), where the economic and environmental impacts are balanced.
Computer Aided Chemical Engineering, 2008
This work addresses the optimization of Supply Chain (SC) planning and design considering economi... more This work addresses the optimization of Supply Chain (SC) planning and design considering economical and environmental issues. The SC operations model applied does not require a superstructure definition a priori for the material flows. The strategic decisions considered in the model are facility location and equipment allocation. For the environmental aspects of the problem a Life Cycle Assessment (LCA) approach is applied. IMPACT 2002+ methodology is selected to perform the impact assessment within the SC since it proposes a feasible implementation of a combined midpointendpoint evaluation. No aggregation of damage categories and analysis of partial environmental impacts for each of echelon are performed. The formulation leads to a multi-criteria MILP program. The criteria adopted as objective functions are damage categories impacts, overall impact factor and net present value (NPV). The main advantages of this model are highlighted through a case study of a maleic anhydride SC.
Computer Aided Chemical Engineering, 2012
In this work we develop a MINLP model that can be used to optimize the design of reactive distill... more In this work we develop a MINLP model that can be used to optimize the design of reactive distillation column. MINLP model is formulated in GAMS in such a way that it can be solved locally and globally. In the RD column a component A is converted into product B while vapour and liquid are assumed to be in equilibrium. The objective is to find a design for this process that minimizes the total costs (consisting of capital and operational costs). The design variables of interest are the total number of stages, the number of reactive stages, the location of the reactive stages, the feed tray location and the reflux ratio.
Computer Aided Chemical Engineering, 2009
In the polymers industry, models are heavily parameterizised, and the effect of each parameter on... more In the polymers industry, models are heavily parameterizised, and the effect of each parameter on model outputs has not been extensively studied. A wide range of values for most of model's parameters can be found in literature [1], a thorough analysis regarding the model's sensitivity to the parameters' values is needed to find the set of parameters that have the
Environmental Science and Engineering, 2009
Abstract Sewage sludge application on agricultural fields is a managing practice of increasing us... more Abstract Sewage sludge application on agricultural fields is a managing practice of increasing use because of its benefits to soil and crops. However, if not well controlled, sludge application may lead to soil contamination. In Europe, threshold values for sewage ...
Green Energy and Technology, 2011
This chapter begins with an introduction to the different possible metrics related to clean gas p... more This chapter begins with an introduction to the different possible metrics related to clean gas process synthesis and its subsequent usage. Latter, the different techniques for tackling with multiple criteria are presented, emphasising the use of multi-criteria decision analysis (MCDA) and multi-objective optimisation (MOO). The different criteria elected here for optimisation are described and later used as key performance indicators (KPI) for the proposed scenarios, in chapter “Selection of Best Designs for Specific Applications”. Finally, a case study related to the operation of an IGCC plant considering coal–petcoke or natural gas as a fuel is assessed applying the optimization concepts introduced here and taking into account the operation considerations developed in this and in previous chapters.
Green Energy and Technology, 2011
The present chapter assembles all the previous chapter’s concepts and methodologies with the aim ... more The present chapter assembles all the previous chapter’s concepts and methodologies with the aim of selecting a given process design. The developed superstructure is used to simulate scenarios with different feedstocks and process topologies for co-production of electricity and hydrogen. The most representative output data are shown, and the described points of view, discussed in chapter “Global Clean Gas Process
Green Energy and Technology, 2011
The pressure on reducing environmental footprint is facilitating the emergence of energy supply c... more The pressure on reducing environmental footprint is facilitating the emergence of energy supply chains that have biomass as main feedstock. For the development of efficient energy supply chains from biomass it is required to properly integrate the various elements that comprise such systems (e.g., biomass supply, pre-treatment facilities and technologies for biomass to energy and/or fuels conversion). Additionally, it is
Green Energy and Technology, 2011
... The other are pyrolysis, hydrothermal and fermentation-based [1]. On the one hand, syngas ...... more ... The other are pyrolysis, hydrothermal and fermentation-based [1]. On the one hand, syngas ...Catalytic conversions outside the gasifier are representative type of processes intensification, since they ... in the case of gasification, steam addition and moisture content in the biomass. ...
Syngas from Waste, 2011
Syngas generation refers to the production of a synthetic or synthesis gas that is mainly compose... more Syngas generation refers to the production of a synthetic or synthesis gas that is mainly composed of CO and H2, in different proportions according to the generation process used and the raw material composition. Gasification is the referred technique to produce syngas. It can be used for different purposes, such as power and/or heat generation or for chemicals and fuels
Industrial & Engineering Chemistry Research, 2009
Industrial & Engineering Chemistry Research, 2008
... Jiménez ‡ , Antonio Espuña † and Luis Puigjaner* †. Department of Chemical Engineering, Pol... more ... Jiménez ‡ , Antonio Espuña † and Luis Puigjaner* †. Department of Chemical Engineering, Polytechnic University of Catalunya, 08028 Barcelona, Spain, and Department of Chemical Engineering, University of Rovira i Virgili, 43007 Tarragona, Spain. Ind. Eng. Chem. Res. ...
Energy, 2009
This work develops a design and operation support tool for an Integrated Gasification Combined Cy... more This work develops a design and operation support tool for an Integrated Gasification Combined Cycle (IGCC) power plant, which allows the efficiency and environmental issues of alternative process designs and feedstock to be assessed. The study is based on a conceptual model of an IGCC plant, validated with data from the ELCOGAS power plant in Spain. The layout of the
Computers & Chemical Engineering, 2009
Computers & Chemical Engineering, 2010
Several authors have pointed out the need to identify the optimum operating conditions (OCs) of a... more Several authors have pointed out the need to identify the optimum operating conditions (OCs) of autothermal thermophilic aerobic digestion (ATAD). This study proves the hypothesis that the OCs have the potential to substantially improve the energy efficiency and plant capacity of established ATAD systems. As ATAD is a semi-batch process, its energy efficiency has to be optimized via dynamic optimization (DO). This methodology requires an adequate mathematical model, and appropriate selection of optimization variables. The paper presents an improved mathematical ATAD model based on previous models found in the literature. A global sensitivity analysis (GSA) was performed in order to identify variables with significant influence upon energy efficiency and plant capacity, thus paving the way for the DO of ATAD systems. The results of the GSA show that reactor volume, reactor temperature, and aeration flowrate are significant variables, which is consistent with reported literature. The results of the GSA also show that both energy efficiency and plant capacity of ATAD systems can be substantially improved by altering reactor volume and OCs.
Dans un mode de realisation, un procede de purification d'un alcool aromatique consiste a : p... more Dans un mode de realisation, un procede de purification d'un alcool aromatique consiste a : polymeriser en masse fondue un compose a fonction dihydroxy et un compose a fonction carbonate en presence d'un catalyseur de transesterification pour former l'alcool aromatique et un polycarbonate dans une installation de polymerisation en masse fondue ; eliminer l'alcool aromatique dans un flux de tete ; separer le flux de tete dans une unite de purification d'alcool aromatique en un flux d'alcool aromatique purifie, comprenant l'alcool aromatique, et en un flux de fond d'unite de purification ; separer le flux de fond d'unite de purification dans une unite de purification de carbonate de diaryle en un flux de carbonate de diaryle et en un flux de fond d'unite de purification de carbonate de diaryle ; et craquer un compose dans le flux de fond d'unite de purification de carbonate de diaryle, dans une unite de craqueur, en presence d'un agent d...
Tdx, Jan 31, 2011
La consulta d'aquesta tesi queda condicionada a l'acceptació de les següents condicions d'ús: La ... more La consulta d'aquesta tesi queda condicionada a l'acceptació de les següents condicions d'ús: La difusió d'aquesta tesi per mitjà del servei TDX (www.tesisenxarxa.net) ha estat autoritzada pels titulars dels drets de propietat intel•lectual únicament per a usos privats emmarcats en activitats d'investigació i docència. No s'autoritza la seva reproducció amb finalitats de lucre ni la seva difusió i posada a disposició des d'un lloc aliè al servei TDX. No s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant al resum de presentació de la tesi com als seus continguts. En la utilització o cita de parts de la tesi és obligat indicar el nom de la persona autora. ADVERTENCIA. La consulta de esta tesis queda condicionada a la aceptación de las siguientes condiciones de uso: La difusión de esta tesis por medio del servicio TDR (www.tesisenred.net) ha sido autorizada por los titulares de los derechos de propiedad intelectual únicamente para usos privados enmarcados en actividades de investigación y docencia. No se autoriza su reproducción con finalidades de lucro ni su difusión y puesta a disposición desde un sitio ajeno al servicio TDR. No se autoriza la presentación de su contenido en una ventana o marco ajeno a TDR (framing). Esta reserva de derechos afecta tanto al resumen de presentación de la tesis como a sus contenidos. En la utilización o cita de partes de la tesis es obligado indicar el nombre de la persona autora. WARNING. On having consulted this thesis you're accepting the following use conditions: Spreading this thesis by the TDX (www.tesisenxarxa.net) service has been authorized by the titular of the intellectual property rights only for private uses placed in investigation and teaching activities. Reproduction with lucrative aims is not authorized neither its spreading and availability from a site foreign to the TDX service. Introducing its content in a window or frame foreign to the TDX service is not authorized (framing). This rights affect to the presentation summary of the thesis as well as to its contents. In the using or citation of parts of the thesis it's obliged to indicate the name of the author Life cycle thinking and general modelling contribution to chemical process sustainable design and operation Life cycle thinking and general modelling contribution to chemical process sustainable design and operation
Biomass can contribute to centralized and / or distributed energy systems, depending on its intri... more Biomass can contribute to centralized and / or distributed energy systems, depending on its intrinsic characteristics, and meet the different user needs. It can be supplied as a liquid, solid or gas energy carrier [1]. The electricity generation sector today needs to reduce its environmental impact and coal dependence. In terms of immediacy and cost of the solution, co-combustion of biomass and coal is presented as an alternative of transition, towards a renewable energy sector [2,3,4]. The use of biomass in large centralized systems, requires the establishment of supply channels to provide adequate feedstocks with the necessary attributes. Hence, there is a need for methods to evaluate the effective introduction of this type of projects in the energy market, to help policy makers and investors in clarifying the potential of biomass and biomass waste in particular. The purpose of this work is to investigate the application of a supply chain management approach in providing biomass, ...
This work aims at analyzing the significant environmental issues associated to production process... more This work aims at analyzing the significant environmental issues associated to production process scheduling. The implementation of a LCA for a given process or product requires the gathering of data regarding process environmental interventions (e.g. raw material consumption, uncontrolled emissions and waste generation). This set of data is organized in a life cycle inventory (LCI) which is the basis for the environmental impact calculation, as specified in the ISO 1404X series. In this work we aim at generating the required process LCI by means of a mathematical programming model. Multicriteria optimization of a mathematical process model representation is considered to obtain the optimal production schedules from both economical and environmental points of view. Peer Reviewed Postprint (published version)
Computer Aided Chemical Engineering, 2015
Abstract In this work a framework for the combined assessment of economic and environmental impac... more Abstract In this work a framework for the combined assessment of economic and environmental impact was developed for an industrial application. The method was tested for a reactive distillation (RD) process that is used for the production of fatty acid esters. The method integrates three stages, first the optimization goals are set and the system is modeled accordingly, secondly a sensitivity analysis is performed, the collected data is lastly interpreted using Pareto analysis and rank and proximity criteria. For the RD case study the sensitivity analysis showed that the catalyst requirement influences the economic impact and that the impact of wastewater treatment is the key component for the environmental impact. From the Pareto analysis recommendations concerning the design of the column can be made (in terms of operational pressure and number of stages), where the economic and environmental impacts are balanced.
Computer Aided Chemical Engineering, 2008
This work addresses the optimization of Supply Chain (SC) planning and design considering economi... more This work addresses the optimization of Supply Chain (SC) planning and design considering economical and environmental issues. The SC operations model applied does not require a superstructure definition a priori for the material flows. The strategic decisions considered in the model are facility location and equipment allocation. For the environmental aspects of the problem a Life Cycle Assessment (LCA) approach is applied. IMPACT 2002+ methodology is selected to perform the impact assessment within the SC since it proposes a feasible implementation of a combined midpointendpoint evaluation. No aggregation of damage categories and analysis of partial environmental impacts for each of echelon are performed. The formulation leads to a multi-criteria MILP program. The criteria adopted as objective functions are damage categories impacts, overall impact factor and net present value (NPV). The main advantages of this model are highlighted through a case study of a maleic anhydride SC.
Computer Aided Chemical Engineering, 2012
In this work we develop a MINLP model that can be used to optimize the design of reactive distill... more In this work we develop a MINLP model that can be used to optimize the design of reactive distillation column. MINLP model is formulated in GAMS in such a way that it can be solved locally and globally. In the RD column a component A is converted into product B while vapour and liquid are assumed to be in equilibrium. The objective is to find a design for this process that minimizes the total costs (consisting of capital and operational costs). The design variables of interest are the total number of stages, the number of reactive stages, the location of the reactive stages, the feed tray location and the reflux ratio.
Computer Aided Chemical Engineering, 2009
In the polymers industry, models are heavily parameterizised, and the effect of each parameter on... more In the polymers industry, models are heavily parameterizised, and the effect of each parameter on model outputs has not been extensively studied. A wide range of values for most of model's parameters can be found in literature [1], a thorough analysis regarding the model's sensitivity to the parameters' values is needed to find the set of parameters that have the
Environmental Science and Engineering, 2009
Abstract Sewage sludge application on agricultural fields is a managing practice of increasing us... more Abstract Sewage sludge application on agricultural fields is a managing practice of increasing use because of its benefits to soil and crops. However, if not well controlled, sludge application may lead to soil contamination. In Europe, threshold values for sewage ...