Four Difficulties in Measuring Coal Slurry by Electromagnetic Flowmeter

Abstract: The information on the four difficulties in measuring coal slurry by electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Although the electromagnetic flowmeter can be used to measure the medium with complex composition such as coal water slurry or mud, it will still have a certain impact on the measurement of the electromagnetic flowmeter due to the special conditions of the medium composition. Here are some of the main difficulties everyone faces: First, the CWS composition. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the four difficulties in measuring coal slurry with electromagnetic flowmeters. Electromagnetic flowmeters are widely used, and some customers often ask about the application and selection of coal slurry electromagnetic flowmeters. Here we will explain that the design and application of coal slurry electromagnetic flowmeters are also different. This medium has higher requirements for electromagnetic flowmeters. Design needs to be examined on a case-by-case basis. Although the electromagnetic flowmeter can be used to measure the medium with complex composition such as coal water slurry or mud, but due to the special conditions of the medium composition, it will still have a certain impact on the measurement of the electromagnetic flowmeter. Here are some of the main difficulties everyone faces: When ordering a coal slurry flowmeter, the user should pay attention to selecting the appropriate specification based on the fluid's nominal diameter, working pressure, working temperature, flow range, fluid type and environmental conditions. When you need our company's display instrument, please refer to the corresponding manual and select the appropriate model, otherwise our technicians will design and select the model for you based on the information you provide. First of all, the composition of coal-water slurry is complex, and it is easy to damage the measurement-related equipment. The measurement is difficult because the coal contains iron wire, copper wire and other metals during the mining process. The additives are ground together to make coal-water slurry, the content of which is 60%~70%, the running density is 1250~1286kg/m3, and the dynamic viscosity is 700~3000cp. When the rod mill or ball mill grinds coal, part of the metal particles will fall off, so it is impossible for subsequent equipment to completely filter and remove the metal particles contained in the coal-water slurry. The impact and wear during the metering process can easily cause damage to the main and auxiliary equipment of the pressure pump and electromagnetic flowmeter. Second, the characteristics of the CWS medium make it difficult to measure the flow rate of liquid-solid mixed conductive media such as CWS and mud. Changes, resulting in sharp pulse pulp (interference) noise in the electrode detection signal output by the electromagnetic flowmeter sensor, causing fluctuations in display and signal output, which are related to the spectral characteristics of the excitation current frequency 1/f of the sensor. The friction of metal particles will produce more serious instantaneous sharp pulse interference, which will eventually lead to serious interference of electromagnetic flowmeter signals and measurement instability. Third, it is difficult to measure the pressure of the pump. When the pressurized pump is working, there will inevitably be a pulsating flow.“screw pump”It is mainly used in the manufacture of coal-water slurry and the supercharging of ordinary boiler combustion. Due to its structure and working mode, the fluctuation of the pulsating flow under different speeds is very small (the fluctuation is generally 0.5%~5%), which generally does not affect the measurement and control application. However, due to the technical requirements of the gasifier, the coal-water slurry nozzle needs a pressurizing pump to pressurize the coal-water slurry to 6~9.6Mpa to achieve the best atomization effect, and it will be higher in the future.“Piston pump”or“Diaphragm pump”. Due to its working principle and structure, even under full load conditions, the pulsating flow of the pressurized liquid fluctuates greatly (the fluctuation is generally 6%~15%). A certain working chamber of the coal slurry pump has problems after long-term operation, and the pulsation will further increase. The working state of each working chamber cannot be monitored in the central control room, but can only be reflected by the instantaneous display of the electromagnetic flowmeter and the fluctuation of the signal output. 4. Difficulties in measurement caused by factors of coal slurry pipeline When the coal slurry transportation stops, the inner wall of the pipeline will be oxidized, resulting in a large amount of rust. The friction of the coal water slurry on the inner wall of the pipeline will cause the fine carbon steel particles to fall off and be wrapped in the coal slurry. When the electromagnetic flowmeter is working, the magnetic field generated in the measuring cavity of the sensor will magnetize the metal particles, so that the metal particles in the coal slurry are adsorbed near the measuring electrode, and a polarization voltage is formed on the electrode, thereby improving the measurement accuracy of the electromagnetic flowmeter itself. Further increase the fluctuation, but this problem is basically non-existent in stainless steel pipes. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Four Difficulties in Measuring Coal Slurry by Electromagnetic Flowmeter'
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