Abstract
The paper presents a flow model of the installation for tank car filling with sulphuric acid (VI). For the mathematical modelling of the flow process in the industrial installation, a model diagram of the object and experiments carried out during the installation work were applied. The analysis of specific experimental series showed unusual shapes of mass flow characteristics vs. the valve opening level (too wide hysteresis), which markedly deviated from typical flow characteristics that are found in standards and literature. As a result of flow modelling in the sulphuric acid installation, a better-shaped characteristic was presented that should be obtained based on the measuring system values in the absence of the inertia-related error. In the experiments carried out according to the selected procedures, effects of the actuator speed on the characteristics of interest were determined. It was observed that the use of a “slower” actuator (i.e., longer transition time) narrows the characteristics in terms of a reduced difference in flow readings between the valve opening and closing courses. In the specified research procedure for the real flow characteristics, effects of the measurement transducer dynamics in the flow meter on the characteristic course were assessed. It was demonstrated that a faster transducer enabled closer flow recordings to the valve nominal characteristics. The variable speed can improve the positioning precision, with the use of the lowest possible speed rule directly before the positioning point.
Highlights
IntroductionFlows of various fluids are typical of almost all production processes
Accepted: 5 May 2021Flows of various fluids are typical of almost all production processes
Mass flow characteristics vs. the valve opening level, which markedly deviated from typical flow characteristics that are found in standards and literature
Summary
Flows of various fluids are typical of almost all production processes They often require careful control of the flow type as well as its measurements and management. This is important when the fluid to be transported constitutes an environmental hazard. A key issue here is proper control of the fluid flow throughout the flow duration, emphasising its initial and final phases as well as breaks due to device malfunction This refers to ensuring a relatively short duration of these phases and stable flow without undesirable effects [1,3,4,5,6] that may be observed if the control valve is opened and closed too quickly. The problem is important when the transported technological fluid constitutes an environmental hazard
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