RELIABILITY OF MONITORING THE CIRCULATING WATERS OF PULP AND PAPER PRODUCTION WITH GRAVITY VORTEX FLOWMETERS
Abstract
The paper covers the operation of submersible vortex flowmeters intended for monitoring the circulating waters of pulp and paper production.
Various components (geometric and hydrodynamic) of the overall measurement error of these flowmeters are considered. Inaccuracies in the installation of instruments as the most important operations preceding their commissioning are considered in detail. The graphs show the results of calculations of the geometric component of the error caused by the non-perpendicularity of the characteristic size of the flow body (TO) and the pipeline axis, as well as the displacement of the TO axes and the pipeline section. It is shown that a change in the geometry of the flow part of the submerged flowmeter leads to a change in the vortex formation process, which results in an additional error, which is the hydrodynamic component of the total error. To find the hydrodynamic component of the error, the method of numerical simulation of hydrodynamic processes was used. Dependencies of the installation error on the hydrodynamic component of the total error are presented. It is revealed that the error value is influenced not only by rotation and displacement of the TO, but also by the size of the pipeline, which in turn is related to the process of vortex formation.Downloads
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References
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