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23rd European Symposium on Computer Aided Process Engineering

23rd European Symposium on Computer Aided Process Engineering
  • Author : Anonim
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780444632418
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Summary : Computer-aided process engineering (CAPE) plays a key design and operations role in the process industries, from the molecular scale through managing complex manufacturing sites. The research interests cover a wide range of interdisciplinary problems related to the current needs of society and industry. ESCAPE 23 brings together researchers and practitioners of computer-aided process engineering interested in modeling, simulation and optimization, synthesis and design, automation and control, and education. The proceedings present and evaluate emerging as well as established research methods and concepts, as well as industrial case studies. Contributions from the international community using computer-based methods in process engineering Reviews the latest developments in process systems engineering Emphasis on industrial and societal challenges

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Emanuele Martelli,Edoardo Amaldi
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085486
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Summary : Process engineering applications often lead to non-smooth constrained optimization problems in which the objective function and/or the constraints have non-differentiabilities and step discontinuities. Since the objective function is often the outcome of a complex simulation or the outcome of a lower level optimization problem, it may also be noisy and not defined in some point. In this work we propose and test a new hybrid direct search method for constrained non-smooth discontinuous problems which combines the positive features of Particle Swarm, Generating Set Search, and Complex, that we refer to as PGS-COM. Computational results show that PGS-COM outperforms the main available methods and exhibits considerable robustness to non-smoothness, unrelaxable constraints, evaluation failures and numerical noise.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Mayank Shah,Anton A. Kiss,Edwin Zondervan,André B. de Haan
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085752
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Summary : This study explores the best suitable internals and various feed configurations of a reactive distillation process for unsaturated polyester synthesis. Multi-product simulations were performed to find the operational parameters for producing different grades of polyester in the same equipment. The product transition time during product changeover is determined for various configurations and product grades. The selection criteria for the best configuration are the minimum requirements of volume and energy to produce 100 ktpy polyesters. The results of the rigorous simulations carried out in Aspen Custom Modeler show that the best configurations employ the reactive stripping section as a packed or trayed bubble column, and the reactive rectifying section as a packed column. With respect to the feed configuration, the feeding of monoesters to the RD column significantly intensifies the polyester process as compared to an anhydrous reactant fed directly to the column. Moreover, the product transition time in this configuration is also significantly reduced as compared to the other configurations.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Afshin Sadrieh,Parisa A. Bahri
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086087
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Summary : This study seeks to pave the way of designing and implementing a Domain-Specific Language (DSL) for controllability analysis of a chemical process design. Chemical processes are nonlinear continuous/discrete dynamic systems that are subject to considerable uncertainties and variations during their design and operation. These systems are designed to operate at an economically optimal steady-state. However, changing the value of the process parameters may cause deviations and elicit dynamic responses from processes. Generally, the ability of holding a process within a specified operating regime is called controllability. In this study a Petri net based DSL is designed specifically for controllability evaluation of process designs with an application to a flowsheet case study.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Mariano Martín,Alberto Martínez
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086186
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Summary : In this work we present a mathematical optimization based methodology for simultaneous formulae and process design in the consumer product business applied to the case of laundry detergents. The design of a new detergent is formulated as a modified pooling problem including process, performance, processability and environmental constraints. This features add a number of nonlinearities related to the modeling of the different aspects of the process and customer acceptance. Furthermore, the problem becomes a multiobjective optimization problem, when environmental constraints are considered, that is solved using the e-constraint method with global optimization techniques to minimize of the environmental impact while minimizing the production cost for a couple of case studies. Finally, ingredients price uncertainty is also addressed using a scenario reduction technique.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : N. Meneghetti,E. Tomba,P. Facco,F. Lince,D.L. Marchisio,A.A. Barresi,F. Bezzo,M. Barolo
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085844
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Summary : Product transfer is a problem commonly encountered in industry when a production has to be transferred from a source plant to a target plant. In this paper a strategy to assist product transfer is proposed. The strategy is based on latent variable models (LVMs) to relate the data available from one or more source plants with the (usually scarce) data available from the target plant, and on LVM inversion to estimate the target plant operating conditions. The inversion is performed within an optimization framework, which can handle constraints for both product quality variables and input variables. An experimental nanoparticle production process is used as a test bed to illustrate the benefits of the proposed strategy.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Edward Close,Daniel G Bracewell,Eva Sorensen
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085189
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Summary : We demonstrate an approach to construct an adaptive design space in the face of process variability, for an industrial hydrophobic interaction chromatography (HIC) with resin lot-to-lot variability. The step has a complex mixture of impurities in the feed stream and a multi component product. The step must deliver a specific distribution of product forms in the elution peak whilst maintaining product recovery and impurity removal. In our approach, a mechanistic model is used which gives a good representation of the system, and has been validated experimentally. The model is used to quickly and efficiently explore the impact of process parameters on process performance, utilizing stochastic simulation to generate probabilistic design spaces for different resin lots. The results indicate that significant increases in process robustness can be made by adapting the design space based on the resin lot in use, rather than fixing the design space for all resin lots. An adaptive design space enables operation further away from high risk regions, increases the size of operating regions and improves flexibility to variations in process inputs.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : M. Mulholland,A. Purdon,M.A. Latifi,C.J. Brouckaert,C.A. Buckley
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086162
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Summary : A Linear Programming technique is proposed to balance the flows in a network, matching flow measurements where available. Where necessary, a “leak-out” flow is invoked on a pipe section in order to achieve the balance. Usually, multiple solutions are possible, and these are sounded out by progressively increasing an integrity weight for each pipe section. A feature of the method is that it overlays “snapshots” of the network at a series of points in time, in order to progressively narrow down the part of the network which can commonly account for all observations.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Miguel Zamarripa,Kefah Hjaila,Javier Silvente,Antonio Espuña
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085905
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Summary : The scope of any Supply Chain management strategy usually takes into account the few single echelons directly linked to the process of interest (raw materials acquisition, market distribution,...) which are assumed to present a previously known behaviour (even this behaviour may include some uncertainty). Decisions based on this limited picture disregard the important information associated to the interaction among different cooperative SCs. This work aims to optimize the overall performance of several SC's in a cooperative scenario acting as an “entire SC”. Accordingly, the main features of this entire SC (raw materials SC, production-distribution SC, products and wastes) have been considered. The approach is demonstrated using a case study which integrates an energy poligeneration SC model (RM acquisition, and different production systems in a competitive situation) and the traditional production-distribution SC model (RM acquisition, distribution to production plants, production, and distribution to markets) in a mixed integer non-linear programming model.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Pablo Garcia-Herreros,Ignacio E. Grossmann,John Wassick
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085950
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Summary : The design of efficient supply chains is a major challenge for companies in the process industry. Supply chain performance is subject to different sources of uncertainty including reliability of the facilities. Facility disruptions are among the most critical events that supply chains can experience. In order to reduce the undesirable effects of disruptions, these events must be anticipated at the design phase of the supply chain. This work addresses the design of supply chains under the risk of facility disruptions by simultaneously considering decisions on the facility location and the inventory management. The proposed formulation is based on a two-stage stochastic programming framework where the scenarios are determined by the possible combinations of facility disruptions. The first stage decisions include the location of distribution centers and their storage capacity. The second stage decisions involve assigning customer demands to the distribution centers that are available in every scenario. The objective is to minimize the sum of investment cost and the expected cost of distribution during a finite time horizon. The formulation is implemented and compared with the optimal solution of the deterministic design problem though an illustrative example. The results show that the proposed formulation generates supply chain designs with the capability to adjust to adverse scenarios. This flexibility translates into significant savings when disruptions occur in the operation of supply chains.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Grégoire Léonard,Bruno Cabeza Mogador,Ségolène Belletante,Georges Heyen
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085745
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Summary : A dynamic model of a post-combustion capture pilot plant is developed using Aspen Plus Dynamics. An innovative process control strategy is studied for regulating the water balance of the process. A washing section where the flue gas from the absorber is washed with cold water is included to the process in order to reduce the emissions of amine to the air. Control of the water balance in the solvent loop is successfully achieved by changing the washing water temperature. In previous publications regarding CO2 capture pilot plants, the regulation of the water balance always required a water make-up flow which appears here as unnecessary. Rejection of disturbances and different load reduction scenarios are tested to confirm the efficiency of this strategy. Potential operational problems of this control strategy are identified and solved.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Katrin Sulzbacher,Peter Balling,Gerhard Schembecker
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086438
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Summary : Process performance and efficiency depend predominantly on decisions made in early phases of process development. At this stage, however, the center of interest is often just the minimization of the time to market. Process alternatives, systematic experimental surveys, simulation studies, and process optimization are often cut down, which leads to processes more expensive and pollutive than their optimum. Therefore, this contribution presents a new bioprocess simulation and optimization tool. It was designed to assist bioprocess development from the first process idea to the final process. With its key features - an adaptive model library and innovative optimization strategy, it enables a holistic view and evaluation of all process alternatives over all phases of process development.

24th European Symposium on Computer Aided Process Engineering

24th European Symposium on Computer Aided Process Engineering
  • Author : Anonim
  • Publisher :Unknown
  • Release Date :2014-06-20
  • Total pages :1954
  • ISBN : 9780444634436
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Summary : The 24th European Symposium on Computer Aided Process Engineering creates an international forum where scientific and industrial contributions of computer-aided techniques are presented with applications in process modeling and simulation, process synthesis and design, operation, and process optimization. The organizers have broadened the boundaries of Process Systems Engineering by inviting contributions at different scales of modeling and demonstrating vertical and horizontal integration. Contributions range from applications at the molecular level to the strategic level of the supply chain and sustainable development. They cover major classical themes, at the same time exploring a new range of applications that address the production of renewable forms of energy, environmental footprints and sustainable use of resources and water.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Siyu Yang,Xiaoping Jia,Chen Yun,Yu Qian
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086476
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Summary : A framework is proposed for sustainability study of coal based chemical and energy processes. Comprehensive analysis from efficiency, energy, economic, and environment perspectives. Process modelling, synthesis, and life cycle analysis, are conducted. Based on these multi-layer analyses, optimization is applied to explore for new process innovation and existing process modification. The analysis is illustrated with two case studies. The first case is the coal based methanol production process, which environmental impacts were investigated in a life cycle assessment. The second case is the co-production of electricity and methanol, in which key parameters are designed by mutual optimisation of energy efficiency and economic cost.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Laurence Tock,François Maréchal
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085608
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Summary : In the context of greenhouse gas emissions mitigation, CO2 capture and storage is regarded as a promising alternative for fossil fuel fed power plants. In order to design and evaluate the competitiveness of such complex integrated energy conversion systems, a systematic comparison including thermodynamic, economic and environmental considerations is necessary. From a process engineering perspective, it is important to evaluate the impact of CO2 capture not only on the efficiency but also on the costs and on the environmental impacts, and to assess the trade-offs. This paper presents the development of a systematic thermo-environomic optimisation strategy for the consistent modelling, comparison and optimisation of fuel decarbonisation options. In particular, it is highlighted how the economic scenario influences the competitiveness and hence the optimal process design.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Ronald Cruz,Luis A. Cisternas,Edelmira D. Gálvez
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086506
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Summary : The mineral industry faces several challenges in designing sustainable mineral operations with lower environmental and social impacts while remaining profitable. These challenges must be addressed in the design, operation and post-closure phases, but the design phase affords the greatest opportunity to reduce the impact of operations and increase profits. One of the most important challenges is the efficient use of water, especially in arid and semiarid regions. Approximately 40-60% of the water loss in copper concentration plants is attributed to the water retained in tailings slurries. This work presents a method of designing dewatering systems using hydrocyclones and thickeners as dewatering equipment. Mathematical models were generated to determine the maximum water recovery and the system structure for known equipment sizes and to determine the minimum cost of the equipment and the system structure for a known water recovery. Several case studies were considered and compared with an experimental study of dewatering in a copper concentrator.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Ergys Pahija,Flavio Manenti,Iqbal M. Mujtaba
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086339
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Summary : This work investigates in detail several methodologies to improve the optimal control of discontinuous processes. It shows that whenever a batch dynamic optimization is solved, the optimum is related to the control methodology adopted and the result is a sub-optimum since other more (or apparently less!) appealing control methodologies might lead to “better” optimal solutions. The selection of the best control methodology for the dynamic optimization is broached for batch reactors using gPROMS models builder 3.5.2 for dynamic modeling and BzzMath 6.0 optimizers to handle control and optimization issues.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Sebastian Recker,Nimet Kerimoglu,Andreas Harwardt,Olga Tkacheva,Wolfgang Marquardt
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086698
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Summary : Reliable models for rate-based phenomena are the backbone of model-based process design. These models are often unknown in the early design phase and need to be determined from laboratory experiments. Although model-based experimental analysis and process design are often executed sequentially, the kinetic models might not be suitable to reliably design a process. In this paper, we address this problem and present a first step on the integration of model identification and process optimization. Rather than decoupling model identification and process optimization, we use information from process optimization to design optimal experiments for improving the quality of the kinetic model given the intended use of the model. Sensitivities, which describe the influence of parametric uncertainties on the economic objective used in process optimization, are used as weights for optimal experimental design. This way, the confidence in the parameter values is maximized to reduce their influence on the process optimization objective. This first step on the integration of model identification and process optimization improves the predictive quality of a reaction kinetic model for process design without any further experimental effort.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Yanina Fumero,M. Susana Moreno,Gabriela Corsano,Jorge M. Montagna
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085837
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Summary : The goal of this work is to propose a multiperiod mixed-integer linear programming model for the design and production planning of multistage multiproduct batch plants integrating, simultaneously, scheduling decisions. The time horizon consists of several periods in which deterministic variations due to seasonal or market fluctuations like prices, products demand limits, costs, and raw materials availability, are taken into account. The plant operates using production campaigns along each time period. The objective function maximizes the net present value considering incomes from product sales and, investment, resources, inventories, operation, waste disposal and late delivery penalties costs. The proposed model allows not only finding the optimal plant structure (unit sizes and its duplication in parallel in each stage), but also the production planning in every time period as well as number and optimal sequence of batches in each campaign.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Pedro Chainho,Ana Carvalho,Henrique A Matos
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128086360
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Summary : Due to the increase competition in the global markets, companies are increasingly receptive to new tools, which help them to improve their processes in terms of economic, environmental and social aspects. This paper aims to analyze an already existent retrofit tool called SustainPro in order to assess the level of input detail required for the analysis. Three scenarios with an increased level of input detail were analyzed. SustainPro was run to all the scenarios and conclusions were taken about the achieved output: indicators sensitivity and the design outcome suggested by the methodology. This work presents a new approach to simplify the input data used in this retrofit analysis (SustainPro) when used by industrial companies, which usually present very complex flowsheets. This study will be based on a formaldehyde production process accomplished by a Portuguese company.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering
  • Author : Franco M. Novara,Juan M. Novas,Gabriela P. Henning
  • Publisher :Unknown
  • Release Date :2013-06-10
  • Total pages :1088
  • ISBN : 9780128085974
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Summary : This work presents a novel, efficient and expressive Constraint Programming (CP) approach to the short-term scheduling problem of multistage batch plants. The CP model accounts for many features found in industrial settings and allows modeling operational policies that group batches of the same product into campaigns. Product campaigns simplify the plant operation and allow reducing scrap and changeover times. The formulation has been extensively tested with various examples, including large-scale ones, and different objective functions. Comparisons with results reported in recent contributions are also presented and discussed.