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1. Open channel box type flowmeter
2. What type of flowmeter is generally used on steam pipelines
Steam pipelines commonly use four types of flowmeters: vortex street, orifice plate, bend pipe, and electromagnetic flowmeter. The core selection needs to be determined based on the steam state, pipe diameter, and operating conditions. 1. The vortex flowmeter is based on the Karman vortex principle and calculates the flow rate by detecting the vortex frequency generated when the fluid passes through the vortex generator. The structure is simple and has low pressure loss, with a wider range than orifice plates and an accuracy of 1.0 level. It is also suitable for saturated steam and superheated steam. Suitable for scenarios that require long-term stable monitoring and minimal pipeline vibration
2. The classic type of orifice flow meter differential pressure type is the flow data conversion method, which utilizes the pressure difference before and after the orifice plate to convert flow data. The biggest advantage lies in sufficient historical verification, complete support for international standards, and adaptability to large diameter (DN500 or above) steam pipelines. However, the throttling design can result in a pressure loss of up to 3-8kPa, and special attention should be paid to regularly cleaning the pressure tapping hole. The elbow flowmeter utilizes the physical characteristics of centrifugal force at the elbow to form a pressure difference between the inside and outside, which belongs to non-contact measurement methods. The absence of inserted components makes it stand out in steam containing impurities, especially suitable for high flow rate (≥ 35m/s) main steam pipelines in power plants. D
3. In which places are vortex flowmeters mainly used?
All vortex flowmeters are based on the Karman vortex principle. Karman vortex is a phenomenon observed and studied by Hungarian American scientist von Karman in 1911: when a fluid passes over a non fluid linear object, paired, alternately arranged, and opposite twisted antisymmetric vortices are generated on both sides of the objects wake.. The generation of this vortex has a periodic and alternating nature, and the frequency of change is proportional to the fluid velocity, which is known as the Karman vortex street phenomenon. A vortex flowmeter is a flowmeter that utilizes the properties of this phenomenon to determine the velocity or flow rate of a fluid by measuring the shedding frequency of vortices. After understanding the principle of vortex flowmeter, one should also know how to use it well. After selecting a vortex flowmeter, the first issue to face is the installation of the vortex flowmeter. So what should be noted during installation? (1) The flowmeter should be installed horizontally or vertically on the pipeline corresponding to the engineering passage. Due to the char