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Examples of heterogeneous catalysis in water remediation and preferential CO oxidation J. Cassano and O. Development of nano-structured micro-porous materials and their application in bioprocess - chemical process intensification and tissue engineering G.

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Ed , Donalies, U. Ed , Nevoigt, E. Kumar, A. Ed , Galaev, I. Ed , Mattiasson, B. Publishing With Us. Although commercial packages could be used in these applications, sometimes — mainly for chemical reaction systems — special models developed outside the general simulation framework are more useful. Computational fluid dynamics models are growing in importance with applications in the study of special flow conditions that can affect performance of some equipment items.

Examples are identification of erosion conditions in piping, and evaluation of temperature limiting conditions into furnace chambers. Such studies were not so common in the past, but internal expertise is being developed so that these models will become more widely applied. He worked in the implementation of large projects, as well as in process improvement activities.

During his career, he has been involved with modeling and simulation, process engineering, process design and development, and technology improvement and selection. In the presentation, it is discussed the integration of the conventional RTO with the Nonlinear Model Predictive Control in a two layer structure where the process optimization is performed in the upper layer, which solves a static problem.

In the lower layer a dynamic control problem based on the Nonlinear Model Predictive Control is solved. The controller includes the optimum input targets defined by the upper layer and it is assumed that the outputs are controlled inside control zones. Different formulations that guarantee the closed-loop stability are discussed and exemplified for a small nonlinear reactor system.

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He received a M. He worked for Petrobras from to as the head of the Advanced Control Group that developed and implemented an in-house advanced control packaged in the main oil refineries of Brazil. His present research interest is in integration of control and real time optimization, nonlinear model predictive control and distributed model predictive control. Jorge O. It is hardly surprising that Big Data, i. This data tsunami creates impatience since companies have invested heavily in data infrastructure for collecting, storing, and retrieving data.

However, this data is not used anywhere close to its potential. Especially in the petrochemical and refinery process industries, the data infrastructure has long been a reality, mainly due to their safety needs. The predictive capacity of this kind of controllers is one of its greatest advantages, since it allows that the MPC take into account the process constraints to compute the control actions. The use of MPCs can improve the process operation reducing the process variability, which directly makes the operation safer and more cost-effective.

With the course of time, the operational conditions of the process naturally change, and the performance of the controller decreases if the maintenance is not performed. Among the sources of performance degradation, the low quality of the process model is one of the most frequent. Thus, precise model assessment is essential for MPC performance, diagnosis, and maintenance.

Because a model is an abstraction of the real system behavior, a model-plant mismatch MPM will always be present. However, sometimes these MPMs are so significant that they lead the controller to poor performance. Thus, it is necessary to quantify the MPM, which cannot be compensated by the feedback controller and, therefore, will deteriorate the corresponding closed-loop behavior. Another point is that MPC with control ranges is a common practice in industrial applications. This approach is used when the controller does not have enough degrees of freedom to control all its outputs.

It means that the number of manipulated variables is smaller than the number of controlled variables and it is not possible to maintain all of them in a fixed setpoint.

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  5. The alternative is to control the outputs by range, where the MPC works to maintain all the controlled variables inside a given band, called soft constraints. In the literature, the available techniques for MPC tuning usually consider a specific operating point OP , while in real plants, controllers should be robust in a wide operating region facing different plant behaviors that arise due to disturbances, saturations, and nonlinearities.

    In this work, a method for MPC tuning proposed in our previous work is extended for a robust tuning for classical square MPCs. This technique applies to any predictive control algorithm, and it considers multi-scenarios based on the closed-loop attainable performance of the system.

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    The sequential procedure is applied, where initially the attainable performance for each scenario herein, different OPs are used is determined, and an estimate of the closed-loop potential is computed. At the end, the optimum scaling for the model and the MPC tuning parameters are calculated, solving an optimization problem that uses the attainable trajectories for each scenario as a reference. This talk will cover all the above issues related to industrial MPCs. A holistic methodology already published in more than 10 qualified papers will be unifinly presented.

    These papers reconcile the correct combination of the new techniques of machine learning and data mining with the basic principles such as feedback control, optimization, phenomenological modeling, etc. References: [1] V. Botelho, J.