Coriolis mass flow meter. The Coriolis force mass flowmeter measures the flow of liquid containing a small amount of solid particles, which is more reliable and reliable in measuring slag bubbles, weight, and drag. Asphalt graphite paste flow [38 B] However, when the solid content increases and the solid particle size is large, the problem of anti-blocking must be considered, especially when the instrument caliber is small. It is best to choose a single straight pipe type and install it on a vertical pipe. Literature [53] proposed a lining wear-through alarm method. In Figure 3.101, when the lining is worn through, the two electrodes are connected by fluid, so that the solid particles in the liquid-solid two-phase flow have various shapes and hardness. The difference is also very large, so the part of the flowmeter in contact with the fluid will be eroded. The abrasion rate is not only related to the shape and hardness of the solid particles, but also related to the flow rate. The higher the flow rate, the faster the abrasion rate. Mounting the flow sensor on a vertical pipe prevents shortened service life due to uneven wear of the pipe wall. However, the thinning of the tube wall thickness will reduce the stiffness of the measuring tube and lead to an increase in error. Of course, the most serious situation is that the measuring tube is worn out, so monitoring should be strengthened when encountering this situation. Ultrasonic flow meter. The Doppler ultrasonic flowmeter in Section 3.3.2 is also suitable for liquid-solid two-phase flow measurement. If a clip-on flow sensor is used, the problems of pipeline abrasion and anti-blocking are all borne by the process pipeline. If the sensor is installed on a horizontal pipe, since the heavy phase flows against the bottom of the pipe, large measurement errors may be introduced, so it should be installed on a vertical pipe as much as possible. Electromagnetic Flowmeter. Electromagnetic flowmeters have unique advantages for measuring liquids with high conductivity such as ore pulp, coal slurry, mud, and paper pulp. First of all, the measurement accuracy is high, which can be several times higher than that of the differential pressure flowmeter; secondly, there is no need to consider the clogging problem at all, because the flow sensor with the same diameter as the process pipeline does not increase the resistance; as for the corrosion resistance problem, it is also emphasized that the The measuring tube is installed in a vertical pipeline, which not only has consistent abrasion, but also is less prone to heavy phase deposition at low flow rates.
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