Application of DWM2000L Electromagnetic Flow Meter in Circulating Water System

Abstract: The application information of DWM2000L electromagnetic flowmeter in circulating water system is provided by excellent flowmeter and flowmeter manufacturers. Abstract: This paper introduces the performance specifications and technical indicators of DWM2000L electromagnetic flowmeter. And summed up the actual application of the instrument's petrochemical plant circulating water system, and compared with other types of flow instruments. Keywords: Electromagnetic flowmeter cycle. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of DWM2000L electromagnetic flowmeter in circulating water system. Abstract: This paper introduces the performance specifications and technical indicators of DWM2000L electromagnetic flowmeter. And summed up the actual application of the instrument's petrochemical plant circulating water system, and compared with other types of flow instruments. Keywords: Electromagnetic Flowmeter Circulating Water System Accuracy DWM2000L Introduction Circulating water system is used as a public works system of the device, in petrochemical and chemical plants. It is not only an important link in environmental maintenance, but also a key component of petrochemical chemical plants. Therefore, the selection and use of circulating water flow meters is also one of the key tasks of chemical plants in the start-up phase. This article introduces the use of the DWM2000L electromagnetic flowmeter used in the circulating water system of the solution styrene-butadiene rubber plant in Shanghai Caojing Chemical Industry Zone. 1 The circulating water system of the solution styrene-butadiene rubber plant is provided by Japan's Asahi Kasei Co., Ltd. with process package technology. It was completed and put into operation in July 2006, and can produce 15 brands of solution styrene-butadiene rubber and low-grade rubber. The normal volume of circulating cooling water in the device is 4000t/h. It is used for the cooling of materials in the main process device, in which a partial circulating cooling water enters the cooler to reduce the temperature of the material, and a partial circulating cooling water enters the condenser for cooling the gas phase material into a liquid phase. Two cooling towers with the same capacity are set up in the device, the diameter is 7000mm, the power is 75kw, and the capacity is 2000m3/h. Three high-power circulating water pumps are set up to supply circulating cooling water into the main process device. In the circulating water system, a sewage pipeline is set up to regularly discharge polluted wastewater; a supplementary water pipeline is set up for replenishment after regular discharge; and a dosing pipeline is used to inhibit the growth of bacteria in the circulating water and prevent replacement Adhesion and corrosion of thermal equipment. Among them, the OPTIFLUX4300cex/IFC300cex circulating water supply pipeline is selected for the sewage and water supply pipelines, and the DWM2000L plug-in electromagnetic flow is selected. The process flow diagram of the circulating water system is shown in Figure 1. The electromagnetic flowmeters of Cologne Company are used on the above pipelines. Figure 1. Process flow diagram of circulating water system. 2. DWM2000L electromagnetic flowmeter 2.1 Measurement principle A conductor moves in a magnetic field and can generate an induced voltage U0. The measured liquid water is a conductor, according to Faraday's law of electromagnetic induction. The movement direction is perpendicular to the magnetic induction intensity B, and the voltage induced between the two electrodes (platinum electrode and ground electrode): U=KBVD where: K is a constant; B is the magnetic induction intensity; V is the medium flow rate; D is the electrode spacing. The voltage U is converted into a 4~20mA electrical signal output that is proportional to the flow rate and independent of the load through the transmitter. The measurement schematic is shown in Figure 2. Figure 2 Measurement principle Figure 2.2 Technical parameters are common type, DWM2000L insertion electromagnetic flowmeter is suitable for flow measurement of conductive liquid and slurry suspension. The protection level is IP66, which is equivalent to NEMA 4 submersible type, and the protection level is IP68, which can be used in closed pipelines and submerged places. DWM2000L is an extended sensor whose length can exceed 3m. The technical parameters are shown in Table 1. Table 1 Technical Parameters Table 2.3 The device should avoid large motors and equipment that is easy to generate magnetic fields. When choosing the location of the device, the length of the upstream and downstream straight pipe sections of the instrument should be satisfied first. To prevent interference, choose a location that is convenient for installation and maintenance. The schematic diagram of the device is shown in Figure 3. In Figure 3 (a is the correct installation method, b is the wrong one, and when the device is extended, the insertion depth must be marked first. Generally, the insertion depth is 1/8 of the pipe diameter. The insertion depth meets Then, turn the whole sensor to make the flow direction mark and fluid direction consistent. Finally, lock the locking piece and tighten the safety chain. For the submersible type, the user should pay special attention to not open the IP68 cable interface. Special sealing treatment is made. Figure 3 Schematic diagram of the device 2.4 Set the direction of the arrow on the electronic components to be consistent with the direction of the medium flow, ① Determine the position of the electronic components. Open the converter housing. Then tighten the locking piece. If the direction of the arrow is the same as that of the medium If the flow direction of the medium is inconsistent, wrong measurement results will be produced. Among them, V=m/Q=m3/hD=the reference speed in the pipe through mm②. Set the reference speed through 2 DIP switches (1m/ and 0.1m/. The calculation can be based on the formula V=354Q/DD.③ Set the time constant. Select the time constant 58 or 10 through the DIP switch to disconnect the circuit; the normally open contact NC indicates that when the speed is greater than the reference speed,④ Set the alarm state. Normally closed contact NO means when the speed is greater than the reference speed. The circuit is closed; when the circuit is open, the LED light is lit. The sealing ring must not be damaged, and special attention should be paid to the installation of the rubber sealing ring when connecting the IP68 housing after setting. Moreover, the inner and outer surfaces of the sealing ring should not be damaged in the slightest, so as to prevent the IP68 casing from entering the water and damaging the instrument.
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