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[ pdf ] Process Modeling Identification and Control

Process Modeling Identification and Control Download
Topic under  Process Control
Source: www.graco.unb.br 
File size: 1.22 MB
File type: pdf
Last download on: Mon Oct 10, 2016 12:41:51 AM
Short Desciption:
Models and dynamic characteristics of continuous processes, Jan Mikles Miroslav Fikar, This chapter serves as an introduction to process control. The aim is to show the necessity of process control and to emphasize its importance in industries and in design of modern technologies. Basic terms and problems of process control and modelling are explained on a simple example of heat exchanger control. Finally, a short history of development in process control is given.

1.1 Topics in Process Control Continuous technologies consist of unit processes, that are rationally arranged and connected in such a way that the desired product is obtained e ectively with certain inputs. The most important technological requirement is safety. The technology must satisfy the desired quantity and quality of the nal product, environmental claims, various technical and operational constraints, market requirements, etc. The operational conditions follow from minimum price and maximum pro t. Control system is the part of technology and in the framework of the whole technology which is a guarantee for satisfaction of the above given requirements. Control systems in the whole consist of technical devices and human factor. Control systems must satisfy  disturbance attenuation,  stability guarantee,  optimal process operation. Control is the purposeful in uence on a controlled object (process) that ensures the ful llment of the required objectives. In order to satisfy the safety and optimal operation of the technology and to meet product speci cations, technical, and other constraints, tasks and problems of control must be divided into a hierarchy of subtasks and subproblems with control of unit processes at the lowest level. The lowest control level may realise continuous-time control of some measured signals, for example to hold temperature at constant value. The second control level may perform static optimisation of the process so that optimal values of some signals ( ows, temperatures) are calculated in certain time instants. These will be set and remain constant till the next optimisation instant. The optimization may also be performed continuously. As the unit processes are connected, their operation is coordinated at the third level. The highest level is in fenced by market, resources, etc.
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