The obvious role of electromagnetic flow meters in the water crisis

Abstract: The information on the obvious role of electromagnetic flowmeters in water crisis is provided by excellent flowmeter and flowmeter manufacturers. The obvious role of electromagnetic flowmeters in the water crisis With the rapid growth of the global population, the rapid industrial development, the rapid deterioration of the global water resources situation, the water crisis is becoming more and more serious. In response to this situation, the Chinese government will invest 300 billion yuan in new construction during the 11th Five-Year Plan period. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the obvious role of electromagnetic flowmeters in the water crisis. The obvious role of electromagnetic flowmeters in the water crisis With the rapid growth of the global population, the rapid industrial development, and the rapid deterioration of the global water resources situation,“water crisis”increasingly serious. In response to this situation, our government will“Eleventh Five”During the period, 300 billion yuan was invested to build or rebuild several sewage treatment plants to promote urban sewage treatment and utilization and reduce pollution. Before 2004, many cities basically did not have facilities such as large centralized sewage treatment plants, let alone flow meters for sewage flow detection. In the process of sewage treatment, the flow rate of raw sewage is a key parameter that needs to be detected. Because the raw sewage is a medium containing particles, suspended solids, solid-liquid mixture, and corrosive, and the electromagnetic flowmeter is the most characteristic of being able to measure the flow of acid, alkali, salt solution and liquid containing solid particles (such as mud) or fiber, therefore, Two electromagnetic flow meters are used for flow measurement of raw sewage. 1 The working principle of the first series of electromagnetic flowmeters The basic principle of electromagnetic flowmeters is Faraday's law of electromagnetic induction, that is, when the conductor cuts the magnetic motion in the magnetic field, the induced electromotive force E is generated at both ends: E- KBvD In the formula, K is the instrument constant ; B is the magnetic induction intensity (T); v is the average speed of conductor movement m/sD is the inner diameter of the pipe (iv). The working principle and structure of the first series of electromagnetic flowmeters are shown in Figure 1, which consists of two parts: flow sensor and converter. When measuring flow, the conductive liquid is equivalent to a conductive metal rod in the Faraday test, flowing through a magnetic field perpendicular to the flow direction at an average velocity v. The flow of conductive liquid induces a voltage proportional to the average flow rate on the measuring electrode. The induced voltage signal E is detected by a pair or more than a pair of electrodes in direct contact with the liquid. According to the volume flow formula of the fluid, Q=1/4 D [D2v (2) From formula (2), we can see that Q and v are a one-to-one correspondence function that is proportional to, then E and Q are also a one-to-one correspondence function that is proportional to, When the induced voltage E is measured, the volume flow Q of the medium is measured. The measured induced voltage E is sent to the converter by the cable, processed intelligently, and then displayed on the LCD, or converted into a standard signal of 4-20mA for output. 2 Features of the first series electromagnetic flowmeter (1) There is no resistance element in the measurement pipeline, no additional pressure loss, and it is not easy to block, which has significant energy saving significance; (2) There are no moving parts in the measurement pipeline, which is not easy to wear, so the sensor has a long life. (3) The straight pipe section required by the sensor is short, which is convenient for installation; (4) Reasonable selection of electrode and lining materials can resist corrosion and wear; (5) Two-way measurement system, which can measure forward and reverse flow; (6) The flow measurement is volume flow, which is not affected by changes in density, viscosity, temperature, pressure, and conductivity of the flow; (7) The sensor induced voltage signal is linearly related to the average flow rate, and the measurement accuracy is high (±0. 3r--0. 5%), the turndown ratio is wide (k 150). 3 The selection of the first series electromagnetic flowmeter selection instrument is very important. Relevant data show that 2/3 of the failures of the instrument in practical applications are caused by the wrong instrument selection or improper use. Therefore, after determining the selection of the electromagnetic flowmeter. , and should also be considered comprehensively according to different processes, environments, measurements, and media. 3.1 Diameter selection According to the diameter of the process pipeline, pipeline pressure and sewage flow rate provided by the sewage treatment plant, choose an electromagnetic flowmeter with a diameter of D-600mrn, and no shrinkage and expansion are required on site. 3 2 Selection of lining and electrode materials The first series of electromagnetic flowmeters are mainly used for measuring conductivity≥For the fluid flow rate of 5U S/cm, different lining and electrode materials should be selected according to the corrosiveness, wearability, temperature and coagulation of the tested substance and its price tolerance. The lining materials of the first series electromagnetic flowmeters are: neoprene rubber material with medium corrosion resistance and low concentration of acid, alkali and salt, polyurethane rubber with strong wear resistance and general corrosion resistance, corrosion resistance Strong performance and suitable for high temperature polytetrafluoroethylene, chemical properties are equivalent to polytetrafluoroethylene tensile, compression polyperfluoroethylene propylene, resistant to dilute acid, alkali, salt temperature<60°C polyethylene and temperature< 100 ℃ polyphenylene sulfide, etc. The electrode material is installed on the inner wall of the pipe and is in direct contact with the substance to be tested, so it should be selected according to the corrosiveness of the substance to be tested. Electromagnetic flowmeter electrode materials include: titanium (Ti) electrode resistant to salt and alkali solution with a concentration of less than 50%, tantalum (Ta) electrode resistant to acid and salt, noble metal platinum electrode with strong corrosion resistance, Hastelloy which is not suitable for hydrochloric acid C electrode and Hastelloy B electrode which is not suitable for nitric acid, stainless steel 316L with general corrosion resistance but low price, etc.
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