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Application of large diameter electromagnetic flowmeter in papermaking technology and sewage treatment industry

With the acceleration of the industrialization process, the problem of environmental pollution has become increasingly serious. In today's advocacy of environmental protection and energy conservation, the concept of harmonious coexistence between man and nature is advocated by people, so the problem of pollution has become a topic of concern. Large-caliber electromagnetic flowmeters are indispensable in the wastewater treatment industry.

Because electromagnetic flowmeters are not affected by external factors such as temperature, pressure, viscosity, etc., they are widely used in the sewage treatment industry. She can test according to the characteristics of large flow, impurity, corrosiveness and certain conductivity according to the sewage. The electromagnetic flowmeter is compact and small in size. Easy to install, operate and maintain, the measuring system adopts intelligent design, the overall sealing is strengthened, and it can work normally in harsh environments. Therefore, in the water and sewage industry, electromagnetic flowmeters, especially large-mouth electromagnetic flowmeters, have great advantages and have been widely used.

The working principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. When the conductive metal rod moves at a certain speed perpendicular to the direction of the magnetic line, an induced voltage is generated. In the electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. The conductivity of industrial water and its aqueous solution is greater than 10-4 S/cm, and the conductivity of acid, alkali and salt liquid is between 10-4 and 10-1 S/cm. There is no problem in use, and low-grade distilled water is 10-5 S/ There is no problem with cm. Electromagnetic flowmeters cannot measure liquids with very low conductivity, such as petroleum products and organic solvents. It is not possible to measure gases, vapors and liquids containing more large bubbles. It is found from the data that some pure liquids or aqueous solutions have low conductivity and are considered to be unusable. However, in practice, examples of the use of impurities may be encountered, and such impurities are advantageous for increasing conductivity. For aqueous solutions, the conductivity in the data is measured in the laboratory using pure water ratio. The actual aqueous solution may be used in industrial water ratio, and the conductivity will be higher than that obtained, which is also beneficial for flow measurement.

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