control and supervision of an intensified heat exchanger ......second, developing automatic methods...
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Context
References
Materials and methods
Aims
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Sara EL RHAZOUANIPhD student under the supervision of CABASSUD Michela and DAHHOU Boutaibb
a Professor, Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, Franceb Professor, LAAS-CNRS, Université de Toulouse, CNRS, INSA, UPS, 31400 Toulouse, France
Control and supervision of an intensified heat –exchanger/reactor for the synthesis of fine chemical
products
Thesis funded by the ANR project “ASPI” for the period from the 1st October 2020 to the 31th September 2023 and performed in the STPI department of LGC, the DISCO department of LAAS and the MeGEP doctoral school.
Simulation of the reactor and the reaction implemented on Matlab/Simulink.
Application of nonlinear observers to the HEX in order to supervise all theinternal states during the process and choosing a suitable observer to develop a new fault diagnosis algorithm for this high nonlinear system.
Analyzing the security aspects of the plant by HAZOP analysis risk method.
Using Labview software to visualize the system in order to measure and to control the temperature of sensors and the flow rate of the process fluid.
[1] He, M., Li, Z., Han, X., Cabassud, M., & Dahhou, B. (2019). Development of a Numerical Model for a Compact Intensified Heat-Exchanger/Reactor. Processes, 7(7), 454.
[2] Han, X., Li, Z., Cabassud, M., & Dahhou, B. (2020, September). A Comparison Study of Nonlinear State Observer Design: Application toan Intensified Heat-Exchanger/Reactor. In 2020 28th Mediterranean Conference on Control and Automation (MED) (pp. 162-167). IEEE
There is a growing interest in process intensification, which aims to replace traditionalchemical processes with new processes that combine two or more traditional operations in onehybrid unit. By combining a heat-exchanger and a plug-flow reactor in only one unit, the HEXreactor not only meets the demand of miniaturization and low cost of the chemical plant, butalso improves the heat and mass transfer ability [1].
The ANR “ASPI” project concerns the problems of control of these intensified chemicalprocesses, from system control to supervision of the control system, including all diagnostic,prognostic and predictive maintenance functions. The objective will be to develop thissupervision based on available work [2], particularly at LAAS*, on fault diagnosis andidentification, observer synthesis, system identification, fault-tolerant control and signalprocessing methods for signal recovery. These methodologies will allow to relieve man from partof the monitoring of the installation while increasing the operating safety.
*LAAS: Laboratoire d’analyse et d’architecture des systèmes.
The aim of this project is to control and supervise an intensified heat-exchanger/reactorinvolved in the fine and pharmaceutical sectors. To do this, it will be a question of anticipatingand correcting possible drifts or malfunctions that could lead to accidental situations.
First, a security analysis and identification of the possible fault on the plant should be carriedout in order to constitute a fault base. Second, developing automatic methods for the control ofthe normal operating mode, then, analyzing the performance of an intensified process controlsystem under operating conditions that can generate failures: fault detection, isolation andidentification procedure (FDI), control system reconfiguration procedure, synthesis of a fault-tolerant control system (FTC). And finally, validate control and supervision tools developed onthe pilot available in the laboratory.
Block modeling description of the HEX, showing (a) utility plate, (b) process plate, and (c) plate wall with Fu: Fluid utility, Fp: Fluid process, R1 and R2 feeding lines. [1]