Application of Velocity Tube Flow Meter in Power Plant

Abstract: The application information of the average velocity tube flow meter in the power plant is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Abstract: This paper introduces the measurement principle of the differential pressure flow measuring device, makes an in-depth comparison between the orifice plate and the uniform velocity tube in the differential pressure flow measuring device, and discusses the advantages of the plug-in flow probe used in power plants and ensuring the safety and accuracy of the probe. Conditions of use and. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of the uniform velocity tube flowmeter in power plants. The measurement principle of the differential pressure flow measuring device is introduced, and the orifice plate and the uniform velocity tube in the differential pressure flow measuring device are compared in depth. Conditions and Precautions. Keywords: flow measurement, orifice plate, velocity-averaging tube, with the rapid development of the electric power industry, various high-efficiency new technologies and processes are constantly being put into use. Advanced processes require high-precision control and measurement in conjunction. Comprehensive and accurate measurement of the flow of steam, water, smoke and air in boilers and turbines is one of the necessary conditions to ensure the safe and economical operation of the unit. There are many types of flow measurement products, which can be divided into: positive displacement flowmeters, differential pressure flowmeters, float flowmeters, turbine flowmeters, electromagnetic flowmeters, vortex flowmeters and mass flowmeters according to the broadest classification. All kinds of flowmeters have their own characteristics, and no measurement method or flowmeter can adapt to various fluids and various flow conditions. Different measurement methods and structures require different measurement operations, usage methods and usage conditions. Each flowmeter has its own unique advantages and disadvantages. Therefore, on the basis of a comprehensive understanding and comparison of various measurement methods and instrument characteristics, choose the best flow measurement product suitable for specific production characteristics, which is safe, reliable, economical and durable. . 1. Comparison of Differential Pressure Flow Measurement Orifice Plate and Velocity Tube 1.1 Types of Differential Pressure Flow Measuring Devices plate, Venturi tube, etc.) and dynamic pressure head type (even velocity tube). Using the principle of differential pressure to measure flow is the most classic and reliable flow detection method in the field of engineering today. Geometry to calculate flow. The differential pressure flowmeter consists of a primary device (detection piece) and a secondary device (differential pressure conversion and flow display instrument). Differential pressure flowmeters are usually classified in the form of test pieces, such as orifice flowmeters, Venturi flowmeters, and even velocity tube flowmeters. The greater the pressure difference generated by the flow detection element in the pipeline, the more beneficial it is to the selection and cost of the differential pressure transmitter, as well as the measurement accuracy. However, since the flow measurement device usually selects the shrinkage ratio (orifice plate, nozzle) according to the flow rate, the problem of increasing the pressure loss will also occur when the differential pressure is increased. The increased pressure loss in the pipeline makes it necessary to increase the power of the pipeline, which requires high-power fans, water pumps, etc., which increases energy consumption and increases the operating cost of the entire system. The representative product of the differential pressure flowmeter is the orifice plate, because people are very familiar with its installation, use, and maintenance, and the orifice plate is easy to replicate, simple, firm, stable and reliable in performance, long in service life, and low in price, so it has been used for a long time. universal. However, when the orifice plate is used for a long time, the accuracy will drop sharply, and regular inspection and cleaning are required. 1.2 Measuring principle of the average velocity tube flowmeter The average velocity tube flowmeter replaces the cross-sectional flow rate of the orifice plate by measuring the flow velocity on a certain diameter. The Delta Bar average velocity tube flowmeter jointly launched by Germany's Systec-Controls and Germany's famous Erlangen University adopts a streamlined tubular design. Take the pressure hole to detect the differential pressure generated by the fluid, obtain an average differential pressure generated by the average flow rate, and transmit this differential pressure to the transmitter through the interface. Through multiple uneven pressure taking holes, the average flow velocity in the pipeline can be reflected as realistically as possible. It not only maintains high precision, high strength and large turn ratio in flow measurement, but also greatly reduces pipeline pressure loss. Compared with the use of orifice plate, the use of plug-in flow probe has obvious economic benefits due to the reduction of pipeline pressure loss. At the same time, the unique probe design can meet the requirements of small pressure loss and large differential pressure at the same time, which is convenient for the selection of transmitters. Take a single-point signal plug-in flow sensor (such as plug-in turbine, vortex street, electromagnetic, etc.) to detect the flow velocity at a certain point in the pipeline, and then analyze this detection point through the flow velocity profile on the empirical chart,The mean flow velocity is inferred. The comprehensive conditions of pipelines and fluids are complex and changeable, and most of them are unshaped velocity profiles. It is inaccurate to replace the average flow velocity with a point measurement value, which directly leads to poor measurement accuracy and low repeatability.

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