Application of Electromagnetic Flow Meter in Strong Corrosive Environment

Abstract: The application information of electromagnetic flowmeters in strong corrosive environments is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The urea production plant of Zhongyuan Dahua Group in Henan Province adopts two electromagnetic flowmeters. One is used to measure the inlet flow of the high-pressure methylammonium pump; the other is used to measure the flow of hydrolysis waste liquid. In practical applications, whether in response speed or in other characteristics. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of electromagnetic flowmeters in strong corrosive environments. The urea production plant of Zhongyuan Dahua Group in Henan Province adopts two electromagnetic flowmeters. One is used to measure the inlet flow of the high-pressure methylammonium pump; the other is used to measure the flow of hydrolysis waste liquid. In practical applications, it can meet the needs of process production in terms of response speed and other characteristics. But there were also problems that we didn't expect. Since it was completed and put into production in October 1989, two electromagnetic flowmeters that only measure the inlet flow of the high-pressure methylammonium pump have been broken, and the other electromagnetic flowmeter that measures the hydrolysis waste liquid has also been damaged many times. The appearance of these problems has added a lot of burden to our factory in terms of process operation and production cost consumption. This article will discuss this problem based on the application of our factory. Working principle and characteristics of electromagnetic flowmeter 1. Working principle The electromagnetic flowmeter system consists of a transmitter and a converter, which are connected by two cables with double shielding. The transmitter is installed on the pipeline system, and the Converters can be installed on-site or in a central room. The measurement principle of the instrument is based on Faraday's law of electromagnetic induction: when a conductor moves in a magnetic field to cut magnetic lines of force, induced electromotive force will be generated at both ends of the conductor. The same applies to conductive fluids. If it is assumed that the magnetic field strength is B, the diameter of the pipe is D, and the induced potential is E, it can be proved that the volume flow of the pipe is Qv=D/4×B and D in the formula (E/B) are set in the table, E is measured by a pair of electrodes on the transmitter measuring pipe, and the actual electromagnetic flowmeter works according to this principle. It can be seen that the electromagnetic flowmeter is an instrument for measuring volume flow, which has nothing to do with the physical properties of the fluid such as temperature, pressure, density, viscosity and conductivity. 2. Characteristics of electromagnetic flowmeter The electromagnetic flowmeter has the following characteristics: (1) The sensing element is not in contact with the measurement medium, and can be used for the measurement of the flow of corrosive conductive media; (2) The range of the electromagnetic flowmeter is wide, and the range of the same electromagnetic flowmeter The ratio can reach 1:100; (3) No pressure loss; (4) There are no moving parts in the detection part; (5) The flow of forward and reverse fluids can be measured; (6) The response speed is fast. The above are the advantages of electromagnetic flowmeter, but it also has certain limitations and shortcomings. (1) The medium to be measured must be conductive: (2) Due to the limitation of the lining material of the measuring tube, the general operating temperature range is 0~200 °C, and because the electrode is embedded in the conduit, the electromagnetic flowmeter works. Pressure is also limited. (3) The electromagnetic flowmeter has a complex structure and a high price. 3. Application of electromagnetic flowmeter The inlet flowmeter FT-09101 of methylammonium pump in our factory is German FISCHER&The products of POTER company have been replaced since October 1989. The first model is DX1221. The outer shell of this electromagnetic flowmeter is made of stainless steel, and the inner wall of the measuring tube is made of PTFE. , There is a four-digit data disk on the internal circuit board, which can be used as an indicator of the measured value. The transmitter and the converter are connected by two cables, the transmitter is installed on the pipeline, and the converter is fixed on the frame next to it. This kind of flowmeter cannot be adjusted by itself regardless of the zero point or the range, and can only be calibrated by the designated manufacturer, which is very inconvenient to use. The flowmeter has not been put into operation for a year, and the indication has failed. After inspection, it was found that the circuit board of the transmitter was corroded, and some of the pins of the crystal triode had been rusted and broken, which did not cause us enough attention. Just replaced a few transistors and put them back on again, so after the repair the watch ran for a few more months and then lost its indication again. When we checked the watch again, we found that the circuit board and the seven-core cable of the transmitter were all corroded, so the watch was scrapped. This aroused our vigilance. It turned out that the place where the watch was installed was too close to the high-pressure methylammonium pump and the high-pressure ammonia pump, and the ammonia that was discharged and leaked at ordinary times and the ammonia gas attached to the methylammonium often surrounded the watch when it was stopped. As a result, the watch has been working in a corrosive environment, and we only paid attention to the corrosion resistance of the watch, while ignoring the external fragility of the watch, which eventually led to the damage of the watch.
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