Application of Electromagnetic Flow Meter in Chemical Industry

Abstract: The application information of electromagnetic flowmeters in the chemical industry is provided by excellent flowmeter and flowmeter manufacturers. Characteristics of electromagnetic flowmeter ①Electromagnetic flowmeter works according to Faraday's law of electromagnetic induction. Therefore, only the flow rate of conductive liquid can be measured, and the flow rate of gas, steam and liquid containing a large amount of gas cannot be measured. ②The electromagnetic flowmeter has no moving parts, too. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the application of electromagnetic flowmeters in the chemical industry. Characteristics of electromagnetic flowmeter ①Electromagnetic flowmeter works according to Faraday's law of electromagnetic induction. Therefore, only the flow rate of conductive liquid can be measured, and the flow rate of gas, steam and liquid containing a large amount of gas cannot be measured. ②The electromagnetic flowmeter has no moving parts and no blocking parts, so there is basically no pressure loss, and it can measure the liquid-solid two-phase flow such as slurry and sewage containing solid particles. ③The electromagnetic flowmeter only has the pipeline lining and electrode in contact with the liquid to be measured, so as long as the electrode and lining material are reasonably selected, the requirements of corrosion resistance and wear resistance can be achieved, such as pulp, hydrochloric acid, hydrogen acid, etc. ④Easy to install, as long as the pipe is full, the straight pipe is installed≥5D, straight down≥2D, can be installed horizontally, vertically, or obliquely. ⑤The measurement accuracy is high, which can reach 0.5%, which can be used as the measurement of barrels, tankers, etc. ⑥ The range ratio is large, generally 1:20. The range can be expanded or reduced according to the needs on site, and no parking is required. The selection and installation of electromagnetic flowmeters are very important and highly professional. The following is a detailed introduction: Applicable medium: Whether the electromagnetic flowmeter is applicable is first judged according to the conductivity of the medium. The conductivity of the measured medium should be greater than 20μs/cm. The flow of lower conductivity medium can be measured by electromagnetic flowmeter with ceramic lining and platinum electrode, but the ceramic lining is fragile and the effect is not ideal. Diameter selection: The diameter of the flowmeter is not necessarily the same as the diameter of the pipe, and it should be determined according to the flow rate. The process industry transports liquids with low viscosity such as water. The flow rate of the pipeline is generally 1.5-3m/s. The electromagnetic flow rate is used in such pipelines. The sensor diameter is the same as the pipe diameter. The flow rate of the fluid for scale and other substances should not be lower than 2m/s, and it is better to increase it to 3-4m/s, which can play the role of self-cleaning and prevent adhesion and deposition. Lower than 2-3m/s to reduce wear on the lining and electrodes; when measuring low-conductivity liquids close to the threshold, select a lower flow rate (0.5-1m/s) as much as possible, because the flow noise will increase as the flow rate increases, And the output shaking phenomenon occurs. Material selection of wetted parts: The parts of the sensor in contact with the liquid are lining, electrode, grounding ring and sealing gasket. The commonly used lining materials are fluoroplastics, polyurethane rubber, neoprene rubber and ceramics. The wear resistance, corrosion resistance and upper temperature limit of the materials affect the adaptability of the instrument to liquids. Fluoroplastics have excellent chemical corrosion resistance, but poor wear resistance, so they cannot be used to measure mineral slurries, and the operating temperature is less than 180 °C; Acid and alkali, the cheapest price; polyurethane rubber has excellent wear resistance, but poor corrosion resistance of acid and alkali. Ceramics have excellent wear resistance and corrosion resistance to strong acid and alkali. They are suitable for corrosive pulp, but are brittle and fragile when installed and clamped. They can be used at higher temperatures (120°C-140°C/180°C). °C). The corrosion resistance of the electrode to the measurement medium is the first factor to be considered in the selection of materials, and the second consideration is whether there will be surface effects such as passivation and the resulting noise. Electromagnetic flowmeter electrodes have high requirements for corrosion resistance. Corrosion is not allowed or strictly speaking, only a very low corrosion rate is allowed. Otherwise, the sealing between the electrode and the lining will be damaged. Commonly used metal materials include molybdenum-containing acid-resistant steel and Hastelloy. , titanium, tantalum, platinum-iridium alloys, which can cover almost all chemical liquids, in addition to low-noise electrodes suitable for slurries, etc. They are conductive rubber electrodes, conductive fluoroplastic electrodes and porous ceramic electrodes, or metal wrapping these materials. electrode. The grounding ring is installed at both ends of the flow sensor connected to plastic pipes or insulating lined metal pipes. Their corrosion resistance requirements are lower than that of electrodes, and certain corrosion is allowed. They can be replaced regularly, usually acid-resistant steel or Hastelloy. Metal process piping in direct contact with the fluid does not require grounding rings.
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