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Reliability Verification of Verabar Flow Meters in Gas

by:Sincerity Group     2023-02-24
Abstract: The reliability verification information of Verabar flowmeters used in gas is provided by excellent flowmeter and flowmeter manufacturers. Verabar flowmeter is the most widely used and most reliable flow measurement method in the world today. With the development of science and technology and the advancement of flow measurement technology, some new and high-performance measurement and sensing devices have also been obtained. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the reliability verification article using Verabar flowmeters in gas. Verabar flowmeter is the most widely used and most reliable flow measurement method in the world today. With the development of science and technology and the advancement of flow measurement technology, some new and high-performance measurement and sensing devices have also been widely used.—Verabar is one of them. The emergence of Verabar has brought the measurement accuracy, repeatability and reliability of the primary source to a new level. Verabar's design and manufacture are advanced, but its measurement system has high requirements on the accuracy of the parameters of the measured medium. This article starts from the measurement principle of Verabar, combined with its application in the gas flow measurement of our company, and discusses the parameter verification problem of the flowmeter in actual use and the related matters that need to be paid attention to in the use process. 2 Verabar measurement principle Verabar average velocity flow probe is vertically inserted into the pipeline and fixedly installed (see Figure 1). When the fluid flows through the probe, a high-pressure distribution area is generated in front of it, and the pressure in the high-pressure distribution area is slightly higher than the static pressure of the pipeline. According to the principle of Bernoulli's equation, the speed of the fluid flows through the probe is accelerated, and the back of the probe is generated. A low pressure distribution area, the pressure in the low pressure distribution area is slightly lower than the static pressure of the pipeline. The Verabar probe has multiple pairs of pressure taking holes arranged according to certain criteria in the high and low pressure areas. Through these pressure taking holes, Verabar can accurately detect the average differential pressure ΔP generated by the average velocity of the fluid. It should be noted that the cross-sectional shape, surface roughness and position of the low pressure pressure taking hole of the average velocity flow probe are the key factors that determine the performance of the probe. The stability and accuracy of the low-voltage signal plays a decisive role in the accuracy and performance of the uniform velocity probe. In gas measurement, the corresponding relationship between flow QV and △P is: QV=C'×[(△P×P(fa))/(T(fa)×Z(f))]/2(1) where: QV——Standard volume flow, m3/h; △P——Differential pressure, kPa; Pfa——Absolute pressure in working state, kPa; Tfa——Absolute temperature in working state, K; Zf——Absolute pressure coefficient of gas under working condition; C'——Flow Coefficient. 3 Verification of parameters in actual use The Verabar flowmeter manufacturer determines the equipment model and calculates the differential pressure according to the relevant process parameters and measurement requirements provided by the user, and the user often provides the design value of the original process design drawing, but it is put into production. In the actual production later, various parameters have changed, which greatly affects the measurement accuracy of the Verabar measurement system for the calculation and setting of the original parameters. It is necessary to re-check the relevant parameters and calculate the new differential pressure value, and revise the setting parameters of the measuring system. Such problems have been found in the gas flow measurement of iron-making hot blast furnaces. Working pressure Pf is one of the key parameters to obtain accurate differential pressure calculation. From formula (1), the formula for calculating differential pressure ΔP is: ΔP=[QV/C']2×[T(fa)×Z(f)/P(fa)](2) where: P(fa) = P(f) + local mean atmospheric pressure. It can be seen that the calculation of the working pressure Pf and the differential pressure is directly related The design value is 40kPa, the differential pressure range calculated by the manufacturer is 200.31Pa, and the corresponding displayed flow value is 15000m3/h. After the measurement system is put into operation, the displayed flow rate is about 31000m3/h, which is seriously inconsistent with the production consumption. After careful inspection, it is found that there are problems with the original parameters provided, among which the pressure parameter has the greatest impact. Because the production level of the iron-making hot blast stove has not reached the designed production capacity, the gas consumption is not large, and the actual working pressure of the gas supply is only 3kPa, but calculated at 3kPa (revised other parameters with errors), the differential pressure of Weiliba is 206.2Pa, which is different from the original differential pressure. The difference is nearly 6Pa. After being put into operation, the flow rate is about 27500m3/h under the same production conditions, which is basically consistent with the production consumption. It can be seen that although the difference in differential pressure is only 6Pa, the difference in flow is about 3500m3/h.
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