Application of Ultrasonic Flow Meter in Large Diameter

Abstract: The application information of ultrasonic flow meter in large diameter is provided by excellent flow meter and flow meter manufacturers. 1. Characteristics of large-diameter circulating water pipeline measurement Because the circulating water pipeline has a large diameter and a large flow rate, a slight deviation in the operation of the instrument will bring about a large measurement error. In order to obtain accurate flow data, the following requirements need to be met during the measurement process. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the application of ultrasonic flowmeters in large diameters. 1. Characteristics of large-diameter circulating water pipeline measurement Because the circulating water pipeline has a large diameter and a large flow rate, a slight deviation in the operation of the instrument will bring about a large measurement error. In order to obtain accurate flow data, it is necessary to meet the following requirements during the measurement process: ① Small pressure loss. Since the energy loss is proportional to the product of the pressure loss and the flow rate, if the pressure loss is too large, the fluid kinetic energy will be lost hugely during the long-term operation of the flowmeter, resulting in a waste of energy. In order to accurately measure large-diameter pipes, the pressure loss during the measurement process needs to be small enough. ②On-line maintenance can be realized. Because the installation site of large-diameter pipelines is relatively humid and difficult to maintain and maintain, it is generally difficult to arrange a bypass for the installation of flowmeters. Even if a bypass and a valve are installed, it is difficult to open and close, and it is difficult to ensure the tightness of the valve. The meter should be low maintenance and easy to service. ③Slightly affected by impurities in the medium. Because the medium in the circulating water pipeline contains many impurities, the pipeline often contains soil, oil stains, sundries, etc., attention should be paid to the mechanical strength and the contamination, entanglement and coverage of the measuring element by impurities in the water. Therefore, measuring instruments without moving mechanical parts or sensors that are not easily affected should be selected. ④Can realize online calibration. The diameter of the pipeline is large and the flow rate is also large, so there will be many troubles and difficulties when calibrating, so it can only be calibrated online during operation. 2 Problems existing in the application of other types of flowmeters Large-caliber circulating water measuring instruments are roughly as follows: ultrasonic flowmeters, electromagnetic flowmeters, vortex flowmeters, differential pressure flowmeters, etc. The main problems of various flowmeters are as follows . 2.1 Electromagnetic flowmeter The electromagnetic flowmeter uses the principle of electromagnetic induction to measure the average flow rate of the conductive liquid in the conduit, and further obtains the volume flow of the liquid. It has the advantages of small pressure loss, unaffected by the temperature, pressure and viscosity of the liquid to be measured, and can measure impurity-containing liquids. , so it is widely used in circulating water metering. But there are still some problems in practical work: ①The measurement error is affected by the external electromagnetic field. Therefore, special attention should be paid to avoid severe vibration and strong AC and DC magnetic fields during installation. ②Affected by the flow velocity distribution, in the case of the symmetrical distribution of the flow velocity axis, the flow signal is proportional to the average flow velocity. Due to the influence of the flow velocity distribution and the eddy current, the straight pipe section upstream of the flowmeter should have a certain length, generally 5D. ③The electrode surface is easy to be polluted. When measuring the fluid with attached sediment, the electrode surface will be polluted, which often causes zero drift. Therefore, during use, it is necessary to pay attention to the regular cleaning of the electrode. 2.2 Vortex flowmeter Vortex flowmeter is used“Karman Vortex Street”principle for flow measurement. It consists of two parts: vortex flow sensor and flow display instrument. There are no moving parts inside the watch, the structure is simple, and the service life is long. The linear measurement range is as wide as 30:1. Within a certain range of Reynolds number, the frequency of vortex generation is only related to the liquid flow rate, and is hardly affected by changes in the measured liquid parameters (such as temperature, pressure, density, composition and viscosity, etc.). The instrument outputs a frequency signal, which is easy to realize digital measurement and use with a computer. Vortex flowmeters are more suitable for measuring liquids with less impurities such as purified water and condensed water. In the case of dirty media, the vortex generator is easy to scale and even be entangled by other impurities contained in the water, resulting in false signals and affecting normal operation. Measurement. ②It is greatly affected by pipeline vibration. If the pipeline vibration is large, it is easy to cause measurement error, which makes the measurement result seriously deviate from the actual. During installation, it is necessary to install brackets on the pipeline to prevent vibration interference. ③ The requirements for straight pipe sections are higher. The straight pipe section is required to be 20D in the front and 5D in the rear. At lower flow rates, the measurement deviation is larger. Generally below 0.4m/s, it cannot be measured accurately. ④ There are problems such as troublesome disassembly and calibration and difficult maintenance, and the authenticity of the data cannot be guaranteed.
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