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Introduction to the application of electromagnetic flowmeter in petrochemical industry

The development of commercial trade at home and abroad is urging the measurement accuracy of the delivery of advanced commodities. The accuracy of the mass flowmeter for petrochemical factory measurement is ±0.1% or higher.
Petrochemical companies have also promoted the application of online analytical instruments in order to strengthen production quality management. It will directly affect the quality of petrochemical enterprises and the level of advanced control applications. Therefore, it has been actively promoted by petrochemical systems, including online oil quality analyzers, online gas or liquid chromatographs and other physical property analyzers.
The latest online multi-channel near-infrared (NIR) spectroscopy analyzer has been applied to petrochemical refining blending systems and achieved good results. The new-generation laboratory low-cost gasoline quality indicator rapid measuring instrument has been successfully applied to Sinopec Hangzhou refinery and other units, and has been well received by users. Soft measurement technology is also being developed very quickly, mainly for the disposal of petrochemical enterprises in part of the analysis and testing problems.
As environmental maintenance demands are getting higher and higher, environmental instrumentation applications have also increased, such as online flue gas analysis, integrated water quality analyzers, online COD analyzers, DO analyzers, and PH analyzers.
At present, the demand for online analytical instruments for petrochemical enterprises is very large, and there is a certain gap between domestic online analytical instruments and foreign products. Most of the online analytical instruments that are commonly used are imported products.
Petrochemicals are paying more and more attention to the maintenance work of the factory, especially for predicting maintenance and maintenance issues. Some companies are pleading to provide online online and real-time sensing systems for monitoring the efficiency, vibration and corrosion of heat exchangers and furnaces and for evaluating "good health" indicators. The use of instruments and systems with diagnostic and predictive maintenance capabilities can increase the consumption potential of existing equipment by 1% to 3%, while unplanned maintenance costs can be reduced by 10% to 30%.
While meeting the on-site appearance, the electromagnetic flowmeter can also output 4~20mA current signal for recording, conditioning and control. It is now widely used in industrial technology and management departments such as chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage. .
An electromagnetic flowmeter that measures the flow velocity of a medium using an electromagnetic induction principle. It adds a magnetic field to both sides of the pipe. The measured medium flows through the pipe to cut the magnetic lines of force, and an induced potential is generated on the two detecting electrodes, the magnitude of which is proportional to the moving speed of the fluid. The electromagnetic flowmeter features no moving parts and parts protruding from the fluid. It has high reliability and can be used to measure acid, alkali, salt solution, coal slurry, pulp, mortar, pulp, resin, Flow of various suspended solids such as rubber latex, synthetic fiber pulp and emulsion, gasification vapor and viscous material. The electromagnetic flowmeter has good sealing performance and can also be used in tap water and open waterway systems. Moreover, the measurement process is not in contact with fluids and is suitable for the pharmaceutical, biochemical and food industries. This flow meter also detects blood flow. Its turndown ratio is about 100:1, the accuracy is usually 0.5%, and the high-precision electromagnetic flowmeter can reach 0.1% (mean square error). Since such a sensor must adhere to a certain proportional relationship between the resistance inside the pipe and the impedance of the measuring circuit, there are certain difficulties in manufacturing. When the conductivity of the measured medium is about 10 ohm·cm, it is difficult to start at the beginning, and the principle is difficult when the conductivity is lower. When the conductivity is 10 ohm.cm, the "boundary line" between the conductive medium and the dielectric is reached, and the thermal noise level increases significantly as the internal resistance increases.

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