SYNTHESIS OF THE STRUCTURAL DIAGRAM OF THE OIL HEATER AS AN OBJECT OF AUTOMATIC CONTROL
DOI:
https://doi.org/10.35546/kntu2078-4481.2023.4.5Keywords:
oil heaters, state space, linearization, transfer functions, dynamics of heat transfer, automatic control system.Abstract
In the oil and gas industry, oil (condensate) heaters have recently been used, in which, unlike direct heating with flue gases, uniform heating of the product is ensured, which prevents the appearance of abnormally hot areas, which can be the cause of emergency situations – pipe ruptures, oil leaks, explosions. To maintain the technological process – the heating of the working product – within the given limits, a local system of automatic temperature regulation of the product at the outlet of the heater is used. The disadvantage of such a system is that external disturbances acting on the object are taken into account by the system using negative feedback. Since the object has significant inertia, indirect consideration by the system of external influences leads to a significant deterioration in the quality of the control process. The creation of a system for automatic control of the process of heating the working product, with increased indicators of the quality of the control process, is possible only on the basis of a mathematical model that describes the dynamics of heat transfer from heat pipes through an intermediate coolant to the working environment. In the work, the mathematical model of the heater is presented in the state space, which has a vector form, which made it possible to simplify both the process of linearization and the process of excluding intermediate variables. The analysis of the obtained model showed that the dynamics of the oil (condensate) heater is characterized by nine transfer functions. The developed structural diagram of the heater will be the basis for the development of an automatic control system for the oil path heater with improved control quality indicators.
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