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The use of electromagnetic flow meter in the chlor-alkali industry

1 The electromagnetic flow meter is based on Faraday's law of electromagnetic induction, consisting of sensors and converters, wherein the sensors are mainly composed of a measuring tube of the inner insulating material, a pair of electrodes that are
installed through the pipe wall, and a pair of coils and cores for producing a working magnetic field. When the conductive medium flows through the sensor tube, there exists a stable magnetic field which is generated by the transducer in an interval perpendicular to the medium flow, and the average velocity of the conductive fluid is used to cut the magnetic field when it flows through the region of the magnet.

2 main technical parameters
maximum flow rate: 15m/s; accuracy: dn15~dn600, ±0. 3%,dn700~dn24000, showing the value of the ±0. 5%. Fluid conductivity: not less than 5p. S/CM Fluid Maximum temperature: normal type, 70oC; parting: PTFE lining, 100oC, neoprene lining, 80 ℃, polyurethane lining, 80 ℃, polypropylene lining, 100 ℃.

3 The advantages of electromagnetic flow meter
① measurement tube without throttling and movable parts, so the pressure loss is very small, save energy, and can measure containing particles, suspended solids and other fluid flow. ② as long as the lining and the electrode contact with the medium, just select the two data, you can reach the purpose of anti-corrosion; The output current of ③ electromagnetic flow meter has a linear relationship with the flow rate. And it is not affected by the physical properties of liquids, so it can be used to measure the flow of other conductive liquids or solid-liquid two-phase media, without modification, only when calibrated with water. ④smart Converter using novel excitation mode, low power consumption, 0 point stability, high precision, flow range of up to 100:1, parameter settings, easy to program, with Self-Test and self-diagnosis function. ⑤ no mechanical inertia, the response is flexible, can measure pulsating flow.

4 electromagnetic flow meter in the chlor-alkali measurement of the suitability of the chlor-alkali industry mainly measured brine and caustic soda, the two have common characteristics: ① salt water is more complex, sometimes acidic, sometimes alkaline, and may be due to the ionic membrane dechlorination, and contains free chlorine, both have a strong corrosive property. ② both are conductive media. ③ north of Chlor-alkali plant due to low temperature in winter, salt water pipelines have been the phenomenon of junction salts, the separation of caustic soda in the course of the process as the temperature is reduced and precipitation of salt; ionic membrane caustic soda 32% will crystallize in the 3~c or so, in the pipeline long and intermittent walk, the winter my factory also showed 32% caustic soda crystallization and make pipe infarct, Therefore, both of the measured medium will appear to contain solid particles. ④ the temperature of both mediums is below 100oC.

According to the characteristics of the measured medium and the advantages of the electromagnetic flow meter, we can see that the electromagnetic flow meter is very suitable for the measurement of chlor-alkali. Although the price of electromagnetic flow meter is more expensive, but its high precision, maintenance of small, long service life, has a higher cost-effective.