Flow meter selection method

Abstract: The flow meter selection method information is provided by the excellent flow meter and flow meter production and quotation manufacturers. First, the principle of flowmeter selection The principle of selecting a flowmeter is to have a deep understanding of the structural principles and fluid characteristics of various flowmeters. Also consider. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on the selection method of flowmeters. First, the principle of flowmeter selection The principle of selecting a flowmeter is to have a deep understanding of the structural principles and fluid characteristics of various flowmeters. Economic factors must also be taken into account. In general, the selection should be made from the following five aspects: ① the performance requirements of the flowmeter; ② the fluid characteristics; ③ the installation requirements; ④ the environmental conditions; ⑤ the price of the flowmeter. 2. Selection of flowmeter 1. Selection of slurry flow measurement The optional flowmeters applied to the slurry containing particle fibers are: differential pressure flowmeter with elbow, wedge-shaped tube, electromagnetic flowmeter, Doppler ultrasonic Flowmeter, vortex flowmeter, target flowmeter, Coriolis mass flowmeter, etc. According to the current use of domestic flowmeters and the measurement performance of various flowmeters, electromagnetic flowmeters are the first choice for measuring slurry flow, unless the measured slurry is non-conductive or contains ferromagnetic particles, and the measurement pipeline system is not allowed to be cut off to Only when the flow sensor is connected, other flow meters are selected. According to reports, many years of application experience in measuring the flow rate of coal-water slurry with a pulverized coal content of up to 65% are considered to be the best electromagnetic flowmeter. Differential pressure flowmeters can be used to measure slurry. In addition to elbows, wedge-shaped tubes and annular tubes, the differential pressure sensor can also be used for circular orifice plates and eccentric orifice plates when the solid phase is small. Venturi tubes are also used for measurement. . Doppler ultrasonic flowmeter can be measured without cutting off the pipe and clamping an ultrasonic transducer (probe) outside the pipe, but the measurement accuracy is not high. Vortex flowmeter can only measure solids containing a small amount of powder, and the solid content is large or fibrous will cause noise and cannot be used. The target flowmeter is used for liquid flow such as heavy oil or residual oil containing pulverized coal, and the strain target flowmeter is used. 2. The choice for the measurement of large flow of liquid in closed pipelines“Relatively large flow”Rather, it refers to the large flow of the absolute value of the flow. Since the flow velocity of the liquid transported by the pipeline has a certain range, the commonly used economic flow velocity of low viscosity liquid is 1~3m/s.“Large Flow”The measurement is said to be large pipe flow measurement. Generally speaking, the flowmeter with pipe diameter below DN300 is called small and medium pipe diameter flowmeter, the one above DN300~ DN400 is called large pipe diameter flowmeter, and the one above DN1200 is called extra large pipe diameter flowmeter. Usually, the liquid flow measurement of extra-large diameter pipes is mainly water, and in addition to water, there are petroleum products. Generally, large-diameter flowmeters include differential pressure flowmeters, electromagnetic flowmeters, ultrasonic flowmeters and insertion flowmeters. There are also positive displacement flowmeters and turbine flowmeters for DN300~DN500. (1) Installation conditions The installation conditions are mainly based on whether the measurement method can allow the pipe flow to be cut off, suspend the operation, whether it is allowed to drill holes in the pipe, and whether it is allowed to cut off the pipe flow to install the flow sensor. If the flow sensor is allowed to cut off the pipe flow, electromagnetic flowmeters, ultrasonic flowmeters with measuring pipe sections, positive displacement flowmeters and turbine flowmeters can be selected. Extrapolation transducer ultrasonic flowmeters and insertion flowmeters can be selected if drilling holes in the pipeline are allowed. If the above requirements are not allowed, you can only choose an ultrasonic flowmeter with an external clip-on transducer. (2) Measurement accuracy requirements For non-conductive liquids requiring high measurement accuracy, ultrasonic flowmeters with measuring pipe sections, multi-channel ultrasonic flowmeters, positive displacement flowmeters and turbine flowmeters can be selected. Liquid can also choose electromagnetic flowmeter. For the control ratio, the differential pressure Venturi tube and the external clamping transducer ultrasonic flowmeter can be selected with lower measurement accuracy requirements. Optional insertion flowmeter with low measurement accuracy requirements. (3) Pressure loss (pumping energy cost) The pumping energy cost of large flow measurement accounts for a considerable proportion of the flow measurement operating cost, and the pressure loss and (pumping energy cost) are larger, such as differential pressure. Type Venturi, positive displacement flowmeter and turbine flowmeter. The smaller is the insertion flowmeter, and the one without pressure loss is the electromagnetic flowmeter. 3. Selection of steam flow measurement Steam flow measurement can be divided into two categories in terms of measurement technology, one is superheated steam and saturated steam with high dryness (above dryness x=0.9), and the other is low dryness saturated steam. The former category can be treated as a single-phase fluid, while the latter category is a two-phase flow. Since all the current flowmeters are only suitable for single-phase fluids, the low dryness saturated steam needs to be further studied. (1) The commonly used flowmeters for the flow measurement of superheated steam and high dryness saturated steam are: throttling differential pressure flowmeter, which is still the main instrument for measuring steam flow. feeling development,

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