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V-cone flowmeter in coal plant has maintenance points - focus on microfluidic control technology

Coal Mine V Cone Flowmeter Maintenance Points

Straight pipe section requirements are low. Although all V-cone flowmeters are measured according to Bernoulli's theorem, Bernoulli's theorem has a basic requirement that the fluid to be measured must be an ideal fluid. When orifice devices such as orifice plates and nozzles are used to obtain the throttling device, in order to satisfy the requirements of Bernoulli's theorem as much as possible, it is necessary to have very long front and rear straight pipe sections in order to shape the irregularly flowing fluid as much as possible. Ideal fluid. The gas flowmeter flow is designed to be streamlined and throttling in the center of the pipeline. Before the flow is detected, the fluid flowing irregularly is rectified at the same time. The fluid rectification problem is solved skillfully without increasing the fluid rectifier. . The streamlined cone suspended in the center can reshape the flow velocity curve, and in the narrower area upstream and downstream of the cone (front 0~3D, rear 0~1D), the liquid with irregular flow rate can be directly rectified into ideal liquid, which can be sufficient Satisfying the requirements of Bernoulli's theorem, obtaining high measurement accuracy and repeatability. It does not need very long straight pipe section rectification, which is very important in the installation process of the V-cone flowmeter.

(2) It is resistant to pollution and is not easy to block. Kunming coking gas plant gas flow measurement, the original use of orifice flowmeter and average velocity tube flowmeter, because the gas contains tar, naphthalene, sulfur, ammonia and other impurities, orifice plate or constant velocity tube must be cleaned regularly Or use steam purging, otherwise the orifice on the orifice plate, the downstream end face, and the upstream side inlet edge will be contaminated, and the pressure guiding tube of the instrument will not be open or blocked, which will affect the measurement accuracy of the system; the water accumulation in the straight section of the orifice plate will make the pipeline circulate. The area is reduced, the flow rate is increased, the differential pressure is increased, the flow rate display value is high, and the pressure transmitter is blocked due to the clogging of the pressure guiding tube. The transmitter cannot operate normally. In order to ensure the normal and stable operation of the V-cone flowmeter, the maintenance workload of the instrumentation is very large. The V-cone flowmeter has a self-purging structure design feature with no dead zone. When the medium flows through the cone, it will accelerate, constantly flushing the positive pressure taking hole, the outer wall of the cone and the wall of the tube near the cone, while the negative pressure taking hole is isolated by a small non-flowing medium, so that dirty impurities cannot enter. Therefore, the gas flow meter can be used in various contaminated, easily crystallized dirty media, such as coke oven gas, producer gas and other media.

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