23rd European Symposium on Computer Aided Process Engineering Book

23rd European Symposium on Computer Aided Process Engineering


  • Author : Anonim
  • Publisher : Elsevier
  • Release Date : 2013-06-10
  • Genre: Technology & Engineering
  • Pages : 1088
  • ISBN 10 : 9780444632418

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23rd European Symposium on Computer Aided Process Engineering Excerpt :

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 Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Laurence Tock
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128085608

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23 European Symposium on Computer Aided Process Engineering Excerpt :

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 Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Jian-Guo Wang
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128085431

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23 European Symposium on Computer Aided Process Engineering Excerpt :

The plant input variables are transformed into the derived variables, which are physically and statistically meaningful for modeling. Then, this study proposed an adaptive modeling approach by employing nonnegative garrote variable selection and auto-regression integrated moving average correction. The high accuracy of the proposed modeling approaches makes the implementation of the model-based control of ratio of air to fuel for improving boiler's efficiency readily practicable.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Marina Fedorova
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086285

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23 European Symposium on Computer Aided Process Engineering Excerpt :

This work focuses on the development of a computer-aided modeling framework. The framework is a knowledge-based system that is built on a generic modeling language and structured on workflows for different modeling tasks. The overall objective of this work is to support model developers and users to generate and test models systematically, efficiently and reliably. In this way, development of products and processes can be made faster, cheaper and more efficient. In this contribution, as part of the framework a generic modeling template for the systematic derivation of problem specific catalytic membrane fixed bed reactor models is presented. The application of the modeling template is highlighted with a case study related to the modeling of a catalytic membrane reactor coupling dehydrogenation of ethylbenzene with hydrogenation of nitrobenzene.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Yuan-Jui Liu
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086674

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23 European Symposium on Computer Aided Process Engineering Excerpt :

In order to monitor nonlinear processes, kernel principal component analysis (KPCA) has become a popular technique. Nevertheless, KPCA suffers from two major disadvantages. First, the underlying manifold structure of data is not considered in process modeling. Second, the selection of kernel function and kernel parameters is always problematic. To avoid such deficiencies, an integrating method of manifolding learning and Gaussian process is proposed in this paper, which extends the utilization of maximum variance unfolding (MVU) to online process monitoring and fault isolation. The proposed method is named as extendable MVU (EMVU), whose effectiveness is verified by the case studies on the benchmark Tennessee Eastman (TE) process.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Jialin Liu
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086247

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23 European Symposium on Computer Aided Process Engineering Excerpt :

Isolating faulty variables is a crucial step during the determination of the root causes of a process fault. Contribution plots, with their corresponding control limits, are the most popular tools used for isolating faulty variables. However, the isolation results may be misled by the smearing effect. In addition, the control limits of the contributions cannot be used to isolate faulty variables, since the control limits are obtained from the normal operating data, which lack any information about the faults. In chemical processes, process faults rarely show a random behavior; on the contrary, they will be propagated to varying variables due to the actions of the process controllers. During the evolution of a fault, the task of isolating faulty variables needs to be concerned with the faulty variables decided in the previous data; in addition, the current decisions should influence the isolation results for the next sample when the fault is constantly occurring. In the presented work, an unsupervised data-driven fault isolation method was developed based on Bayesian decision theory. The Tennessee Eastman (TE) process was used as a benchmark example to demonstrate how the different faulty variables were isolated when the fault was evolving.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Johannes Jung
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086551

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23 European Symposium on Computer Aided Process Engineering Excerpt :

Environmental process design methods often incorporate life-cycle assessment (LCA) as a deterministic black-box methodology. However, LCA suffers from several sources of ambiguity and uncertainty. These limitations are particularly severe for the multi-functional processes typical for the chemical industry. This work introduces a rigorous uncertainty assessment framework. The framework quantifies data uncertainties and also uncertainties that result from fixing multi-functionality in LCA by allocation. The method is derived from a matrix-framework for LCA and applied to a comparison of alternative chlorine electrolysis technologies.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Kazuhiro Takeda
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086001

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23 European Symposium on Computer Aided Process Engineering Excerpt :

Uncontrolled changes caused many accidents or disasters. Management of change (MOC) has been a very important issue in process safety management. In this paper, it is considered that MOC is divided to two parts: one is individual change management and the other is management of them. Individual change management is an instance of engineering over the plant lifecycle (Plant-LCE), however a business flow of MOC has been hardly discussed. A business flow of MOC is expected to be based on a business process model (BPM) of Plant-LCE. The logical process safety management based on a BPM of Plant-LCE has been proposed. However the BPM is dispersed and too detailed for precisely. Therefore, an overview for the BPM of Plant-LCE has been proposed. Using an individual change management example, this paper shows that a business flow of the MOC can be described in the overview of the BPM of Plant-LCE.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Weifeng Chen
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086414

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23 European Symposium on Computer Aided Process Engineering Excerpt :

Real-time optimization (RTO) has become a standard practice to improve production benefits during the past years. The efficiency of solving optimization problems is critical because a large computational delay leads to the possible loss of validity and availability of RTO. In this study, the Mnemonic Enhancement Optimization (MEO) strategy of initialization for RTO has been extended by taking advantage of optimal sensitivity. The approximation precision and the solution information database accumulation efficiency of the proposed sensitivity-based MEO are briefly analyzed. The numerical results tested with a high-pressure column of a cryogenic air separation unit were in agreement with the theoretical analysis.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Seungnam Kim
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128085653

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23 European Symposium on Computer Aided Process Engineering Excerpt :

High purity methane gas from bio-gas has been magnified as an alternative source of energy recently. Gas above 95% purity can be used as fuel for transportation, however only gas above 97% purity can be distributed via pipe lines for domestic usage. Price of 97% purity gas for domestic gas is much higher than 95% purity gas that is used only for transportation, however recovery of methane gas in the process is lower. Purity and recovery of the product is determined by operating procedures. Thus, several researchers are setting their goal to improve profit by controlling operating procedures. Among upgrading processes, the Pressure Swing Adsorption (PSA) is suitable for separation of high purity methane gas in terms of economics. In this study, as step-time in the PSA has huge effect in the entire process, the optimal step-time for maximizing profit is evaluated in the bio-gas upgrading process using PSA. Especially the relation between profit and steptime is taken into consideration. Before optimization, a 4-step PSA model has been built on physics and chemistry theoretical basis. The developed model is also simulated using dynamic simulation software. After that, optimal step-time for maximizing profit is calculated by optimization method.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Siyu Yang
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086476

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23 European Symposium on Computer Aided Process Engineering Excerpt :

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 Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Calin-Cristian Cormos
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128085028

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23 European Symposium on Computer Aided Process Engineering Excerpt :

Hydrogen is considered to be one clean energy carrier for the future. The main advantage of using hydrogen as energy carrier represents the negligible greenhouse gas emissions. One of the most encouraging hydrogen production methods is based on bioethanol. This paper is devoted to the conceptual design of hydrogen production process using bioethanol reforming at an industrial scale (100000 Nm3/h hydrogen equivalent to 300 MW thermal). The syngas will be then converted into hydrogen by water gas shift reaction. Two distinct designs were investigated, one without carbon capture and one with carbon capture. In the design with carbon capture and storage (CCS), the shifted syngas is treated for removing CO2 by gas-liquid absorption process. Considering that bioethanol has a low or negligible fossil carbon footprint, the case with CCS has a negative CO2 emissions contributing to decreasing atmospheric CO2. The conceptual designs of bioethanol reforming were modeled and simulated to produce mass and energy balances for quantification of key plant performance indicators (e.g. bioethanol consumption, plant energy efficiency, ancillary energy consumption, specific CO2 emissions etc.). A particular accent is put on assessment of reforming unit operation conditions, process integration issues of reforming unit and syngas conditioning line with carbon capture unit, modeling and simulation of whole plant, thermal and power integration of various plant sub-systems by pinch analysis. Benchmark cases based on fossil fuels partial oxidation were also presented.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Sebastian Recker
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128086698

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23 European Symposium on Computer Aided Process Engineering Excerpt :

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 Book

23 European Symposium on Computer Aided Process Engineering


  • Author : Sathit Niamsuwan
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128085172

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23 European Symposium on Computer Aided Process Engineering Excerpt :

A milk pasteurization process is a nonlinear process and multivariable interacting system. This makes it difficultly to control by the conventional on-off controllers. Even if the on-off controller can managed the milk temperatures in the holding tube and the cooling stage of the plate pasteurizer according to the plant's requirements, the dynamic profiles of the milk temperature are oscillating around a desired value. Consequently, this work is aimed at improving the control performance by a multi-variables control approach with model predictive control (MPC). The proposed algorithm was tested in the case of set point tracking under nominal condition gathered by the real observation. To compare the performance of the MPC controller, a model-based control approach of generic model control (GMC) coupled with cascade control strategy is taken into account. The simulation results demonstrated that a proposed control algorithm performed well in keeping both the milk and water temperatures at the desired set points without any oscillation and overshoot. Because of the predictive control strategy, the control response for MPC was less drastic control action compared to the GMC.

23 European Symposium on Computer Aided Process Engineering Book

23 European Symposium on Computer Aided Process Engineering


  • Author : María Vázquez-Ojeda
  • Publisher : Elsevier Inc. Chapters
  • Release Date : 2013-06-10
  • Genre: Science
  • Pages : 1088
  • ISBN 10 : 9780128085356

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23 European Symposium on Computer Aided Process Engineering Excerpt :

Due to the increasing demand for new fuels that are economically attractive, and as part of the quest for energy alternatives to replace carbon-based fuels, the purification of ethanol plays a key role. Bioethanol is an environmentally-friendly fuel with less greenhouse gases emissions than gasoline, but with similar energy power. Nevertheless the large-scale production of bioethanol fuel requires energy demanding distillation steps to concentrate the diluted streams from the fermentation step and to overcome the azeotropic behavior of the ethanol-water mixture. This work presents the design and optimization of a dehydration process for ethanol, using two separation sequences: a conventional arrangement using distillation and extractive distillation and an alternative arrangement based on liquid-liquid extraction and extractive distillation. Moreover, different solvents were optimized simultaneously in the liquid-liquid extraction column, while ethylene glycol was used as extractive agent in the extractive distillation (ED). Both sequences were optimized using a stochastic global optimization algorithm of differential evolution (DE) coupled to rigorous Aspen Plus simulations. The economic feasibility of utilities for the two configurations was studied by changing the ethanol/water composition in the analyzed feed stream. The results demonstrate significant savings around 20% in total annual cost when the alternative arrangement is used.