Comparison of Flow Meters of Equal Velocity Tubes and Their Application in Power Plants

Abstract: The comparison of the flow meter of the average velocity tube and the application information in the power plant are provided by the excellent manufacturers of flow meters and flow meters. With the rapid development of the power industry, various high-efficiency new technologies and processes have been put into use. Advanced processes require high-precision control and measurement in conjunction. Comprehensive and accurate flow of steam, water, smoke and wind in boilers and turbines. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the comparison of the average velocity tube flowmeter and the details of the application in power plants. With the rapid development of the power industry, various high-efficiency new technologies and processes have been 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. 1 Comparison of Differential Pressure Flow Measurement Orifice Plate and Velocity Tube Types of Differential Pressure Flow Measurement Devices Currently, the most widely used in industrial measurement is differential pressure flow measurement, and the mainstream product of differential pressure type is throttling (orifice 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, if the orifice plate is used for a long time, the accuracy will drop sharply, and regular testing and cleaning are required. With the continuous development of speed tube cross-section technology and hole-opening technology, its measurement accuracy has been continuously improved. 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. The single-point signal plug-in flow sensor (such as plug-in turbine, vortex street, electromagnetic, etc.) detects the flow velocity at a certain point in the pipeline, and then analyzes this detection point through the flow velocity profile on the empirical chart to infer the average flow velocity. 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. 1.3 Advantages of Delta Bar flow probe (1) It can measure a variety of media, has a wide range of applications, and is minimally affected by physical properties and pipeline characteristics. The diameter range can be from 3mm to 15m; the high temperature and high pressure probe can work in the steam environment of 650℃ and 28MPa. If you choose 1.4828, X15CrNiSi20-12 probe, the working temperature can be as high as 1040℃; you can also choose 1.4539 (A904 alloy, X1NiCrMoCu25 -20-5) and HC4 probe, work in flue gas with SO, SO2 or strong acid and alkali medium. The Delta Bar flow probe can be used for: ① various types of gas measurement, including air, humid gas, various flue gases before and after purification, high temperature flue gas, compressed air, primary air, secondary air, etc.; ② various types of steam Measurement, including steam, saturated steam, superheated steam; ③ measurement of various liquids,Including water, fuel oil and benzene, etc.

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