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The electromagnetic flowmeter is an instrument for measuring the flow of a conductive liquid based on Faraday's law of electromagnetic induction. The application field has been widely used in industrial and agricultural production and various departments of scientific experiments, but its successful application is still limited to axisymmetric tube flow. Non-axisymmetric flows are ubiquitous in industrial fields. In the case of non-axisymmetric flow, there are still many theoretical and practical issues to be solved. Using the uniform magnetic field, based on Maxwell-Minkowski equation, the expression of average flow velocity under arbitrary flow pattern was obtained by integrating the induced potential on the wall of the measuring tube, which can be used to measure the average flow velocity of non-axisymmetric tube flow.
Industrial boilers and industrial kilns, energy security issues to ease oil shortages, is a new type of low-pollution industrial raw materials. In the production of coal-water slurry and pipeline transportation, it must be measured and tested. Due to the special physical composition of the coal water slurry, its dynamic viscosity is between 500-3000 MPaS (usually the power viscosity is 800-1500 MPaS for industrial application), it is a kind of non-Newtonian fluid, and there are problems of sedimentation and abrasion of solid particles, resulting in The flow measurement of coal-water slurry is very difficult. According to the experience of water and coal slurry measurement at home and abroad, electromagnetic flow meter is the first choice for water coal slurry metering. This is because the electromagnetic flowmeter does not have a fluid-blocking component in the measurement tube, which is suitable for measuring such high-concentration solid-liquid mixtures, and it is less affected by the density and viscosity, so it has become the preferred measuring instrument.
In recent years, due to the harsh environment and corrosion of the site, most of the original rotor flowmeters were damaged due to transmission components, some of the electromagnetic flowmeters were also corroded due to wiring, and the linings or coils and converters were difficult to repair due to damage, resulting in partial flow. Meter cannot be used normally. Therefore, the flowmeters that have seriously affected the continuous and stable operation of the device have been successively transformed. The electromagnetic flowmeter of Beijing Oude Instrument Technology Co., Ltd. is very effective.
Analyze the value of electromagnetic flowmeter in various industries
With the development of China's urban economy, both the volume of domestic sewage and the volume of industrial sewage have shown a rapid growth, which has led to an ever-increasing trend of water environmental pollution and declining water environment quality. Therefore, the state has stepped up investment in sewage treatment, constructed and put into operation a large number of sewage treatment plants, and thus improved our ecological environment. How to ensure that the water quality and quantity of sewage treatment meet the national emission standards, which puts forward new requirements for the configuration and management of measuring instruments. At present, the sewage treatment plant gradually popularizes and popularizes the electromagnetic flowmeter, which measures more accurately. In the traditional monitoring and information integration system of the sewage treatment plant, the electromagnetic flowmeter uses 4-20mA (transmitting analog information) or 24VDC (transmitting switch information) signals for communication and transmission, and many in-situ flow meters and controllers The connection is one-to-one (a point of control for an I/O point to the device) so-called I/O wiring. However, there are some obvious shortcomings in such a system, that is, the information integration capability is not strong; the system is not open, the integration is poor, and the professionalism is not strong; the reliability is not easy to guarantee; the maintainability is not high. If the field-level device is equipped with a serial data interface (such as RS-232/485), the controller can complete the monitoring of the field device through the serial communication method instead of the I/O method according to the protocol specified by the interface.