Application of electromagnetic flow meter in paper pulp industry

Abstract: The application information of electromagnetic flowmeters in the pulp and paper industry is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. With the acceleration of China's industrialization process, the problem of environmental pollution is becoming more and more serious, and the society's voice for sustainable development is getting louder and louder. application and effect. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the application of electromagnetic flowmeters in the pulp and paper industry. With the acceleration of China's industrialization process, the problem of environmental pollution is becoming more and more serious, and the society's voice for sustainable development is getting louder and louder. Application and effect The sewage treatment process mainly achieves the purpose of sewage purification through biological oxidation, flocculation, sedimentation and other processes, and requires a certain amount of meter to measure at each stage. In the sewage treatment process, it is necessary to configure the corresponding detection instruments according to the process requirements to form a reliable control system. A water treatment plant is equipped with a flow meter in the following process testing processes: 1. water inlet pipe; 2. mud volume detection from primary sedimentation tank to mud storage tank; 3. residual and sludge flow detection of sludge pump room; 4. sludge pump room return sewage. Mud flow detection; 5. Outlet flow detection of water distribution wells in secondary sedimentation tank; 6. Detection of mud input in digestion tank; 7. Detection of sludge output in digestion tank; 8. Flow measurement is very important because in the sewage treatment process, discharge sewage, additives, sludge, etc. need to be metered and controlled. 1. Characteristics of electromagnetic flowmeter The electromagnetic flowmeter is not affected by external factors such as temperature, pressure and viscosity, and there is no pressure loss caused by shrinkage or protrusion inside the measuring tube. In addition, the initial signal detected by the flow element is a The average flow rate of the fluid becomes a voltage that changes accurately and linearly, which has nothing to do with other properties of the fluid and has great advantages. According to the characteristics of sewage with large flow changes, impurities, low corrosiveness, and certain electrical conductivity, electromagnetic flowmeters are a good choice for measuring the flow of sewage. It is compact in structure and small in size. It is easy to install, operate and maintain. The measuring system adopts intelligent design and the overall seal is strengthened, so that it can work normally in harsh environments. However, due to technical reasons, it is difficult to enlarge the diameter of the vortex flowmeter, and the quality of the pipeline ultrasonic flowmeter lacks a competitive advantage in price compared with the electromagnetic. Therefore, in the water and sewage industry, electromagnetic flowmeters, especially large-diameter electromagnetic flowmeters, have great advantages and have been widely used. TKLD series electromagnetic flowmeter is powerful and easy to operate. The specific features are as follows: 1. There are no obstructions to flow parts in the measurement pipeline, no pressure loss, and the straight pipe section requires the bottom. 2 The lining is available in various materials such as hard rubber, polyurethane, PTFE, PFA, etc. 3 Transmitter DC power supply/AC power supply, four-wire/two-wire, explosion-proof/non-explosion-proof, economical/standard and other subdivisions to meet your different needs. 4 Measurements are not affected by changes in fluid density, viscosity, pressure, temperature, and electrical conductivity. 5 photosensitive keys, which can be operated without opening the cover; Chinese menu display is more convenient for domestic users. 6 Quick setting menu, guide to complete parameter setting, convenient and quick. 7. High measurement reliability, good repeatability, and long-term maintenance-free. The range ratio is up to 1000:18 to provide various output modes such as current, frequency, pulse, Hart, profibus-PA, profibus-DP, FF, etc. for selection. 2. Measuring principle The working principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. When the conductive metal rod moves perpendicular to the direction of the magnetic field line at a certain speed, an induced voltage will be generated. In the electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows, an induced voltage is generated. Two electrodes inside the pipe measure the induced voltage generated. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode by means of a non-conductive lined rubber, Teflon, etc. Assuming that the magnetic field strength B generated by the electromagnetic induction coil is constant, the induced voltage Ue is proportional to the fluid velocity v, and the pipe cross-sectional area A is known, the volume flow Qv can be calculated by the following formula: The electromagnetic flowmeter is composed of a flow sensor and a transmitter. It consists of two parts. The sensor measuring tube is equipped with an excitation coil up and down. After passing the excitation current, a magnetic field is generated to pass through the measuring tube. A pair of electrodes are installed on the inner wall of the measuring tube to contact with the liquid, and the induced potential is drawn out and sent to the transmitter. The excitation current is provided by the transmitter. According to the assembly method of the transmitter and the sensor, there are two types: separate type and integrated type. In the sewage treatment process, the large-diameter flowmeters are mostly split-type, some of which are installed underground, and the other part is on the ground. Small calibers are mostly integrated. The functions of electromagnetic flowmeters on the market are also very different.It is simple to measure one-way flow, and only output analog signal to drive the rear instrument; the multi-function instrument has two-way flow measurement, range switching, upper and lower limit flow alarm, empty pipe and power cut-off alarm, small signal cut-off, flow display and total amount. Calculation, automatic check and fault self-diagnosis, communication with upper computer and motion configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and dedicated chip ASIC to connect HART protocol system, PROFTBUS, MODBUS, FF field bus, etc.
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