Application of electromagnetic flowmeter in petrochemical industry

With the rapid development of computer technology, the petrochemical instrument automatic control system has gradually developed in the direction of digitization, networking, modeling, and intelligence. Based on the development of existing information systems, petrochemical companies continue to deepen their integrated automation systems, strengthen the application of safety control systems, and improve their basic automation and advanced control levels to enhance their market competitiveness. With the rapid development of computer technology, the petrochemical instrument automatic control system has gradually developed in the direction of digitization, networking, modeling, and intelligence. Based on the development of existing information systems, petrochemical companies continue to deepen their integrated automation systems, strengthen the application of safety control systems, and improve their basic automation and advanced control levels to enhance their market competitiveness. Application of new automatic detection and analyzer: The development of domestic and foreign instrument systems to digitization, intelligence, networking, and miniaturization has enabled petrochemical enterprises to improve the application level of automatic detection instruments. In order to meet the requirements of fieldbus control systems, fieldbus transmitters have developed rapidly. This transmitter is fully digital, simple in structure, and higher in resolution and stability than general smart transmitters. As fieldbus digital instrument products are becoming more and more complete, and have the characteristics of high reliability and interoperability (that is, products of different brands can be integrated and configured), they will get more applications in the field of petrochemical process control. The development of domestic and foreign commercial trade requires improvement in the measurement accuracy of commodity delivery. The accuracy of mass flow meters used in petrochemical factory measurement applications is ±0.1% or higher. In order to strengthen product quality management, petrochemical companies have also promoted the application of online analytical instruments. It will directly affect the product quality of petrochemical companies and the level of advanced control applications, so 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) spectrum analyzer has been applied to the refining blending system of petrochemical enterprises and achieved good results. A new generation of laboratory low-cost gasoline quality index rapid tester has been successfully applied to Sinopec Hangzhou Refinery and other units, and has been well received by users. Soft-sensing technology has also developed rapidly, and it is mainly used to solve some of the analysis and detection problems of petrochemical enterprises. As the requirements for environmental protection are getting higher and higher, the application of environmental protection instruments is also increasing, such as online flue gas analysis, integrated water quality analyzer, online COD analyzer, DO analyzer, and PH analyzer. At present, petrochemical companies are in great demand for online analytical instruments, and there is a certain gap between domestic online analytical instruments and foreign products. Most online analytical instruments used today are imported products. Petrochemical is paying more and more attention to plant maintenance, and is particularly interested in predictive maintenance issues. Some companies require on-line and real-time sensing systems to monitor the efficiency, vibration and corrosion of heat exchangers and heating furnaces and to assess 'health' indicators. Using instruments and systems with diagnostic and predictive maintenance capabilities can increase the production potential of existing equipment by 1% to 3%, while unplanned maintenance costs can be reduced by 10% to 30%. The electromagnetic flowmeter can output 4-20mA current signal for recording, adjustment and control while meeting the on-site display. It has been widely used in chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technology and management departments. .　　 An electromagnetic flowmeter that uses the principle of electromagnetic induction to measure the flow rate of the medium fluid. It adds a magnetic field on both sides of the pipeline, and the measured medium cuts the lines of magnetic force when the measured medium flows through the pipeline, and generates an induced electric potential on the two detection electrodes, the magnitude of which is proportional to the movement speed of the fluid. The characteristic of electromagnetic flowmeter is that there are 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, mineral pulp, mortar mortar, paper pulp, resin, The flow rate of various suspended solids, vaporized vapors and viscous substances such as rubber latex, synthetic fiber pulp and photosensitive latex. The electromagnetic flowmeter has good sealing performance and can also be used in tap water and underground water system. Moreover, the measurement process is not in contact with fluid, which is suitable for the pharmaceutical, biochemical and food industries. This flowmeter can also detect blood flow. Its turndown ratio is about 100:1, the accuracy is generally 1%, and the high-precision electromagnetic flowmeter can reach 0.1% (mean square error). Since this sensor must maintain a certain proportional relationship between the resistance in the pipeline and the impedance of the measuring circuit, it is difficult to manufacture. Difficulties begin to occur when the conductivity of the measured medium is about 10 ohm·cm, and principle difficulties arise when the conductivity is lower. When the conductivity is 10 ohm·cm, it reaches the 'boundary line' between the conductive medium and the dielectric, and the thermal noise level increases significantly with the increase of the internal resistance. Electromagnetic flowmeters are high-precision, high-reliability, and long-life flow meters. Therefore, we are very careful in every aspect of the process of designing product structure, material selection, formulating technology, production assembly and factory testing, and we have also designed our own A set of China's most advanced production equipment and flow calibration device dedicated to electromagnetic flowmeters, so that both software and hardware can effectively ensure the long-term high quality of the product. The electromagnetic flowmeter is specially designed with a Chinese LCD display with backlight and wide temperature. It has complete functions and practicality, intuitive display, easy operation and use, which can reduce the inconvenience caused by the English menu of other electromagnetic flowmeters. In addition, we exclusively designed the 4-6 multi-electrode structure to further ensure the measurement accuracy and no grounding ring is needed at any time, which reduces the volume of the instrument and the trouble of installation and maintenance.