Application of Vortex Flow Meter in Flow Measurement in Chemical Industry

Abstract: The application information of vortex flowmeter in the flow measurement of chemical industry is provided by excellent flowmeter and flowmeter manufacturers. Vortex flowmeter is a very commonly used measuring flow element in industrial production, which is of great significance to industrial production. At present, vortex flowmeters are widely used in various industrial production, and the effect of measuring flow is very significant. This article will be directed to China. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of vortex flowmeters in flow measurement in the chemical industry. Vortex flowmeter is a very commonly used measuring flow element in industrial production, which is of great significance to industrial production. At present, vortex flowmeters are widely used in various industrial production, and the effect of measuring flow is very significant. This article will briefly describe the application of Huaning vortex flowmeter in the flow measurement of chemical industry. From the perspective of the development of flow meters, the orifice flow has a wide range of applications: but there are still some deficiencies in the use of standard orifice flowmeters to measure fluid flow. For many years, people have been trying to find a reliable and accurate flowmeter for flow measurement, and found that the vortex flowmeter has a simple structure and is easy to install and maintain. Compared with the orifice plate, it does not need a pressure guiding pipe and three sets of valves, reducing leakage, blockage and freezing. and other phenomena), the pressure loss is small (about 1/4-1/2 of the orifice flowmeter), the range is wide, the range ratio can reach 20BI (orifice is 3BI), and the measurement accuracy is higher than that of the orifice flowmeter. In addition, the vortex flowmeter also has the advantages of long service life, stable performance, many types of applicable fluids (can measure liquid, gas and steam), and the instrument coefficient is not affected by the temperature, pressure and viscosity of the fluid within the specified Reynolds number range. And the influence of composition changes and other characteristics, has been more and more favored by people. 1 Working principle Vortex flowmeter is a new type of flow measuring instrument based on the principle of fluid oscillation. The measurement principle is shown in Figure 1. When a nonlinear cylinder (vortex generator) with a vertical direction of motion is inserted into the fluid, two rows of internally swirling vortex rows will be alternately generated on the downstream side, which are called“Karman vortex”. Within a certain range of Reynolds number, the release frequency f of the vortex is related to the average velocity v of the fluid flowing through the vortex generator and the characteristic width d of the vortex generator, which can be expressed by the following formula: f=StV/d(1) In the formula, f ))) The release frequency of the vortex; v”) The average velocity of the fluid flowing through the vortex generator; d”) The characteristic width of the vortex generator; St))) The Strouhal number strouhal (dimensionless constant). S. The value of is related to the width d of the vortex generator and the Reynolds number Re. When the Reynolds number Re<2@104, S. is a variable; Re is in the range of 2@104-7@106, S. The value remains basically unchanged, and this range is the basic measurement range of the flowmeter. Equation (1) shows that when d and St are fixed values, the frequency f generated by the vortex is proportional to the average flow velocity v of the fluid and has nothing to do with parameters such as temperature, pressure, density, composition, and viscosity of the fluid. Therefore, the average flow velocity v of the fluid can be obtained from the frequency f generated by the vortex, so as to achieve the purpose of measuring the flow rate Q of the fluid in the pipeline. v=fSd(2) Q=vS=fSd(3) Formula (S in 31 is the cross-sectional area of ​​the pipeline. Sds is a constant, let = go=}s, then Q=f/K. In the formula, K is the flow meter The meter coefficient (number of pulses/liter) is usually obtained by the actual flow test. Since vortices are generated alternately on both sides of the vortex generator, the vortex force acts on the detection body, causing it to generate alternating stress, which acts on the electrical components. On the upper side, an alternating charge signal with the same frequency as the vortex is generated. After being processed by the converter, the pulse signal with the same frequency as the vortex or a 4-20mADC signal proportional to the flow rate is output to the secondary instrument for accumulation and display. 2 The selection of vortex flow is generally divided into two steps: model selection and caliber selection. 2.1 Model selection Choose flowmeters with different structures according to the use environment and the fluid to be measured. When the ambient temperature of the flowmeter is lower than 60e, the flow rate The combined type can be selected for the meter. When the ambient temperature of the flowmeter is higher than 60e, the separate type should be selected. When the operating environment is inflammable and explosive, the flameproof type or intrinsically safe type should be selected according to the explosion-proof grade.

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