Outline how to choose a suitable flow meter in sewage measurement

Abstract: An overview of how to choose a suitable flow meter in sewage measurement is provided by excellent flow meter and flow meter manufacturers. Introduction F.C.Kinghoro, a foreign flow expert, once said that the flowmeter is one of the few instruments that is more difficult to use than to manufacture. This is because flow is a dynamic quantity, and there is not only viscous friction inside the liquid in motion, but also viscous friction. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is an article that outlines how to choose a suitable flowmeter in sewage measurement. Introduction F.C.Kinghoro, a foreign flow expert, once said that the flowmeter is one of the few instruments that is more difficult to use than to manufacture. This is because the flow is a dynamic quantity, and there is not only viscous friction inside the liquid in motion, but also complex flow phenomena such as unstable vortex and secondary flow. The measuring instrument itself is affected by many factors, such as: pipeline, diameter size, shape (circle, rectangle), boundary conditions, physical properties of the medium (temperature, pressure, density, viscosity, dirt, corrosiveness, etc.), fluid flow state (turbulent flow state, velocity distribution, etc.) and the influence of installation conditions and levels. In the face of more than ten categories and hundreds of varieties of flow meters at home and abroad, (the types of volumetric, differential pressure, vortex, area, electromagnetic, ultrasonic and thermal flowmeters developed successively), How to select a model reasonably according to factors such as flow rate, flow state, installation requirements, environmental conditions, and economy is the premise and basis for the application of flow meters. In addition to ensuring the quality of the instrument itself, it is also very important to provide process data and whether the installation, use and maintenance of the instrument are reasonable. This paper introduces the selection and design of electromagnetic, vortex, and throttle flow meters that are often used in sewage flow measurement. Combined with the characteristics of sewage treatment technology, it expounds their respective characteristics from both theoretical and practical aspects. 1. Electromagnetic flowmeter type design Since the first industrial application in China in the late 1950s, electromagnetic flowmeters have been used and developed rapidly in flow measurement in the 1970s and 1980s. The working principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, that is, the measured medium flows perpendicular to the direction of the magnetic field lines, so an induced electromotive force is generated in the direction perpendicular to the flow of the medium and the magnetic field lines. V; B is the magnetic induction intensity, T; D is the distance between the two electrodes, mm;υis the average flow velocity of the measured medium, m/s. The flow rate Q and d of the measured medium (equivalent to D, both refer to the distance between the two poles) andυRelated: From the above two formulas: When the magnetic field strength B and the distance d between the two poles are constant, then: EX=K×Q(4) Among them, K=4×10-4/πd, is a constant. It can be seen from formula (4) that the induced electromotive force EX is proportional to the flow rate (velocity) of the measured medium. The electromagnetic flowmeter is not affected by external factors such as temperature, pressure, viscosity, density, etc., and there is no shrinkage or pressure inside the measuring tube. Loss, in addition, the initial signal detected by the flow element is a voltage that varies precisely linearly with the average flow rate of the fluid, which is independent of other properties of the fluid and has great advantages. According to the characteristics of sewage with large flow changes, impurities, low corrosiveness, and certain electrical conductivity, electromagnetic flowmeters are a good choice for measuring the flow of sewage. It has compact structure, small volume, convenient installation, operation and maintenance. For example, the measuring system adopts intelligent design and the overall sealing is strengthened, so that it can work normally in harsh environments. The electromagnetic flowmeter with neoprene lining and molybdenum-containing stainless steel (OCrI8Ni12Mo2Ti) electrode can be selected to meet the requirements of sewage flow measurement. During the production of a smelter, a large amount of industrial sewage will be generated due to the needs of the production process. The sewage treatment plant must monitor the flow of sewage. In the past selection and design, many flow meters use vortex flowmeters and orifice flowmeters. In practical applications, it is found that the measured flow display value has a large deviation from the actual flow rate, and the deviation of the electromagnetic flowmeter is greatly reduced. 2. Vortex flowmeter selection and design As a new type of flowmeter, vortex flowmeter has developed rapidly since the mid-1980s. It has many advantages and advantages in flow measurement, and is more and more widely used in modern flow measurement. . The use of vortex flowmeters for flow measurement in my country has also been paid more and more attention. At present, there are product series with excellent performance and independent intellectual property rights in China. Vortex flowmeter is developed based on fluid vibration. According to the difference of vortex, the detection method has gradually developed from hot wire type, thermal type to stress type, magnetic sensitive type, differential switched capacitive type, ultrasonic type, etc. Vortex flowmeters can be used in almost all occasions where a vortex column can be formed, not only in closed pipes, but also in open grooves.

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