Problems in the use of vortex flowmeters1

Main problems Vortex flowmeters have been used in large quantities for more than ten years, and the results are not satisfactory. The main reasons are as follows. l) Product quality problems, serious defects in design principles or design schemes, poor quality of product materials and workmanship. 2) Problems in instrument type selection and use, inaccurate process parameters given by the user, resulting in inappropriate type selection; problems in the selection of the installation site, and the installation does not meet the specified requirements. 3) On-site adjustment problems, lack of adjustment or improper adjustment in on-site operation, correct adjustment is the key to good use. Applicable conditions Vortex flowmeters are not suitable for measuring low Reynolds number ( Red ≥ 2 x10000 ) fluids. When the Reynolds number is low, the Strouhal number changes with the Reynolds number, and the linearity of the instrument becomes poor. High fluid viscosity will significantly affect or even hinder the generation of vortex. One of the constraints for selection is that it cannot be used below the limit Reynolds number. . The vortex flowmeter is suitable for a wide range of fluids, but attention should be paid to the dirty nature of the fluid. The scouring of the vortex generating body by the fluid containing solid particles will generate noise and wear the vortex generating body. If the short fibers contained are wound on the vortex generating body, the instrument coefficient will be changed. Vortex flowmeters have little experience in the application of mixed-phase fluids. Generally, they can be used for gas-liquid two-phase flows containing dispersed and uniform micro-bubbles, but the volumetric gas content should be less than 7% to 10%. The meter factor should be corrected. It can be used for gas-solid, liquid-solid two-phase flow containing dispersed and uniform solid particles with a content of no more than 2%. It can be used for two-component flow of immiscible liquid-liquid (such as oil and water), etc. Pulsating and swirling flows can have serious effects on vortex flowmeters. If the pulsating frequency is in sync with the frequency band of the vortex street, it may cause resonance to destroy the normal work and equipment, and cause the vortex signal to 'lock in' phenomenon, at which time the signal is fixed at a certain frequency. 'Locking' is related to the pulsation amplitude, the shape of the vortex generating body and the blockage ratio. Economy Among the many flowmeters, the vortex flowmeter has better economy and is an economical flowmeter.

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