Talking about the principle and hotspot of vortex flowmeter

Abstract: A brief introduction to the principle and hot information of vortex flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Abstract: The measurement principle and application of vortex flowmeter are introduced. The selection of vortex flowmeter, parameter setting of vortex flowmeter, installation and use precautions are introduced in detail. Compared with the orifice plate flowmeter, it has the advantages of simple structure, convenient installation and maintenance, and measurement range. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is a brief introduction to the principles of vortex flowmeters and details of hot articles. The measurement principle and application of vortex flowmeter are introduced. The selection of vortex flowmeter, parameter setting of vortex flowmeter, installation and use precautions are introduced in detail. Compared with the orifice plate flowmeter, it has the characteristics of simple structure, convenient installation and maintenance, and wide measuring range. In the 1980s, people generally used standard orifice flowmeters for saturated steam flow measurement, but from the perspective of the development of flow meters, orifice flowmeters have a long history and wide application range; people have the most complete research on it, and the most experimental data. Although the standard orifice flowmeter is used to measure the saturated steam flow, it still has some shortcomings: first, the pressure loss is relatively large; second, the pressure guiding pipe, the three groups and the connecting joints are easy to leak; The measurement range is small, generally 3 to 1, and the large fluctuation of the flow rate will easily cause the measured value to be low. The vortex flowmeter has a simple structure, and the vortex transmitter is directly installed on the pipeline, which overcomes the phenomenon of pipeline leakage. In addition, the pressure loss of the vortex flowmeter is small, the range is wide, and the measurement range ratio of saturated steam can reach 30 to 1. Therefore, with the maturity of vortex flowmeter measurement technology, the use of vortex flowmeter is more and more popular. 1. The measurement principle of vortex flowmeter The vortex flowmeter uses the principle of fluid oscillation to measure the flow. When the fluid passes through the vortex flow transmitter in the pipeline, the vortex generator of the triangular column alternately generates up and down proportional to the flow rate. Two rows of vortices, the release frequency of the vortex is related to the average velocity of the fluid flowing through the vortex generator and the characteristic width of the vortex generator, which can be expressed by the following formula: f=Stv/d where: f is the release frequency of the vortex, Hz; v is the The average velocity of the fluid flowing through the vortex generator, m/s; d is the characteristic width of the vortex generator, m; St is the Strohha number, dimensionless, and its value ranges from 0.14 to 0.27. St is a function of Reynolds number, St=f(l/Re). When the Reynolds number Re is in the range of 102~105, the St value is about 0.2. Therefore, in the measurement, try to satisfy the Reynolds number of the fluid in the range of 102~105 and the vortex frequency f=0.2v/d. It can be seen that the average velocity v of the fluid flowing through the vortex generator can be calculated by measuring the vortex frequency, and then the flow rate q can be obtained from the formula q=vA, where A is the cross-sectional area of ​​the fluid flowing through the vortex generator. When the vortex is generated on both sides of the generating body, the piezoelectric sensor is used to measure the change of the alternating lift force perpendicular to the flow direction of the fluid, and the change of the lift force is converted into an electrical frequency signal, and then the frequency signal is amplified and shaped, and then output to the secondary The instrument is accumulated and displayed. 2. Application of vortex flowmeter 1. Selection of vortex flowmeter (1) Selection of vortex flowmeter Due to the wide range of the vortex flowmeter, in practical applications, the main consideration is that the flow rate of saturated steam shall not be lower than the lower limit of the vortex flowmeter, that is to say, the fluid velocity must not be lower than 5m/s . Vortex flow transmitters with different diameters are selected according to the size of the steam consumption, and the diameter of the transmitter cannot be selected with the existing process pipe diameter. (2) Selection of pressure compensation pressure transmitter Because the saturated steam pipeline is long and the pressure fluctuates greatly, pressure compensation must be used. Considering the corresponding relationship between pressure, temperature and density, only pressure compensation can be used in the measurement. The saturated steam pressure of the company's pipeline is in the range of 0.3-0.7MPa, and the range of the pressure transmitter can be selected as 1MPa. (3) Display instrument selection Display instrument Intelligent flow indicator has the functions of temperature and pressure compensation, instantaneous flow display and cumulative flow accumulation. 2. Most settings of the vortex flowmeter (1) The setting of the instrument system, the instrument coefficient K that needs to be set by Hefei Instrument Factory can be expressed by the following formula: K=1000/K0 In the formula: K0 is the vortex generator in The instrument constant calibrated at the factory, L/pulse; the unit of k is the number of pulses/m3. (2) Range setting of pressure compensation pressure transmitter. (3) Pressure and flow alarm upper limit setting. 3. Installation of vortex flowmeter (1) The vortex flowmeter should be installed as far as possible away from the vibration source and the place with strong electromagnetic interference. The vibration damping device must be used in the place where the vibration exists to reduce the influence of the pipeline by vibration. (2) The configuration of the straight pipe section, the front and rear straight pipe sections should meet the requirements of the vortex flowmeter,The inner diameter of the pipeline must also be the same as the inner diameter of the vortex flow transmitter. 4. Precautions for the use of vortex flowmeters Minimize the impact of the steam hammer in the pipeline on the vortex generating body. When the vibration is large and cannot be eliminated, the vortex flowmeter should not be used. 3. Conclusion After the vortex flowmeter was put into use in our company, it has overcome many shortcomings of the original orifice flowmeter, and the measurement of saturated steam is more accurate and stable, and maintenance is convenient, but it is worth noting that the flow rate of saturated steam fluid cannot be measured. Below 5m/S, otherwise, the flow measurement value will be low. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'On the Principles and Hotspots of Vortex Flow Meters'

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