A decentralized optimal regulator problem is studied for a set of interconnected distributed subsystems described by linear symmetric hyperbolic equations of first order. Coupling is provided through boundary conditions. Long tubular reactors divided into sections with zonal or pointwise controls can be examples of such plants. Then subsystems are meant as sections of the reactor. The overall q...

With regard to the application in a microstructured reactor, a special VOx/Al2O3 catalyst powder (3 μm) was prepared and characterised by BET, XRD, UV/Vis DRS, and Raman spectroscopy. The higher the vanadium content, the higher the degree of polymerisation of the vanadium species on the support surface and the lower the BET surface area. Pelletised powders were tested in conventional tubular re...

The adaptive output feedback control problem of chemical distributed parameter systems is investigated while the process parameters are unknown. Such systems can be usually modeled by semilinear partial differential equations (PDEs). A combination of Galerkin’s method and proper orthogonal decomposition is applied to generate a reduced order model which captures the dominant dynamic behavior of...

Aerosol synthesis methods for the production of nanostructured fullerene particles have been developed. The nanostructured, ultrafine fullerene particles were produced by vapor condensation and aerosol droplet drying and crystallization methods in tubular laminar flow reactors. The formation mechanisms were studied by measuring particle-size distributions is the gas phase. High-resolution scann...

This paper presents the optimal control policy of an industrial low-density polyethylene (LDPE) plant. Based on a dynamic model of the whole plant, optimal feed profiles are determined to minimize the transient states generated during the switching between different steady states. The industrial process under study produces LDPE by high-pressure polymerization of ethylene in a tubular reactor u...

This paper deals with the stabilization of a non isothermal tubular reactor in which convection, diffusion and chemical reaction occur. The is modelled by set non-linear partial differential equations distributed jacket temperature used as control input. Two stabilizing laws are derived using thermodynamic availability function Lyapunov function. It shown how closed loop performances, terms set...

In the present work, the pyrolysis of acetylene was studied under steel vacuum carburizing conditions in a tubular flow reactor. The pyrolysis temperature ranged from 650 degrees C to 1050 degrees C. The partial pressure of acetylene in the feed mixture was 10 and 20 mbar, respectively, while the rest of the mixture consisted of nitrogen. The total pressure of the mixture was 1.6 bar. A kinetic...

A new approach for the identification and control of distributed parameter systems is presented in this paper. A radial basis neural network is used to model the distribution of the system output variables over space and time. The neural network model is then used for synthesizing a non linear model predictive control configuration. The resulting framework is particular useful for control probl...

While in the first paper of this series of two, optimal jacket fluid temperature control profiles have been derived for a family of dispersive tubular chemical reactors, the performance of these optimal profiles is further assessed in this second part. First, the performance of the optimal bang-bang control is compared with that of a more easily implementable constant jacket fluid temperature a...

This paper deals with the adaptive control of the tubular chemical reactor as a typical member of nonlinear system with continuously distributed parameters. Although this system has negative control properties, proposed adaptive controller which uses external linear model and recursive identification provides good control results. This controller is designed with the use of polynomial approach ...