Talking about the selection of steam flow meter

Abstract: Talking about the selection information of steam flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. At present, our company widely uses coke oven gas in the continuous production process of large and medium-sized equipment such as converters, heating furnaces, and sintering machines, but the accurate measurement of coke oven gas has always been one of the difficult problems in metallurgical measurement. With the continuous emergence of many new flowmeters, give a solution. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is a brief introduction to the selection of steam flowmeters. At present, our company widely uses coke oven gas in the continuous production process of large and medium-sized equipment such as converters, heating furnaces, and sintering machines, but the accurate measurement of coke oven gas has always been one of the difficult problems in metallurgical measurement. With the continuous emergence of many new flowmeters, it has provided help to solve this problem, and the rational selection of flowmeters has become the key to accurately measuring the amount of gas. 2 Several common flow meters in the metallurgical industry 2.1 Steam flow meter The steam flow meter is to install a throttling piece with a diameter slightly smaller than the pipe diameter in the pipeline. When the fluid flows in the pipeline, the flow velocity must be accelerated due to the sudden reduction of the flow cross section. According to the law of conservation of energy, the result of the accelerated flow rate will inevitably lead to a decrease in the static pressure energy, thus a static pressure difference is generated between the upstream and downstream of the throttling member. The flow rate is obtained from this static pressure difference. This kind of flowmeter is commonly used, but due to the limitations of design, installation, maintenance and use conditions, it is difficult to operate normally for a long time in many occasions. 2.2 Insertion type turbine flowmeter The insertion type turbine flowmeter works based on the principle of conservation of moment of momentum. The fluid impinges on the turbine blades, and the rotational speed of the wheel changes with the flow. Therefore, the flow rate can be obtained from the rotational speed of the turbine. Advantages of this flowmeter: It is suitable for gas with large and medium diameters, and can withstand different ranges of pressures of high, medium and low. Disadvantages: When the flow rate is very small, it is difficult for the fluid to rotate the turbine, so this kind of flowmeter has a certain flow rate lower limit and cannot be measured from zero. 2.3 Ultrasonic flowmeter Ultrasonic flowmeter uses the difference between the inverse of the propagation time of ultrasonic pulses in the forward and reverse directions to measure the flow rate, thereby obtaining the flow rate. Advantages: Bidirectional measurement can be performed, and it can be used to measure the liquid velocity or flow in large and medium pipelines. This kind of flowmeter is the most convenient to install. Disadvantages: The measurement technology of gas is not yet mature, and it cannot accurately measure the gas. 2.4 The principle of vortex flowmeter: when a bluff object is vertically inserted into the fluid, the fluid forms a streamline along the boundary of the object at low speed, and at high speed, two rows of alternating vortices with internal rotation are generated downstream, each side of the vortex. The frequency of separation is in a wide range of Reynolds number ( ), which has a linear relationship with the flow rate. , viscosity and other changes, the pressure loss is small and the precision is high. 3. The use status and reasonable selection of our company's existing flowmeters At present, the flowmeters used by our company are mainly steam flowmeters. Although this type of flowmeter has a long history of use and more experience, due to the staggered pipeline network in the plant area, many flowmeters are installed at high altitudes or in pressurized stations, and there are few opportunities for orifice plate disassembly and maintenance. In addition, a large amount of tar, ash, and water often accumulate in the coke oven gas pipeline, causing the orifice plate to rust, wear, deform and block, resulting in a big difference between the actual use and the ideal requirements. Therefore, throttling flowmeter is not an ideal flowmeter device in many occasions, especially in gas measurement. Although the plug-in turbine flowmeter has the advantages of large measuring range and low price, it cannot be measured from zero, and it is not suitable for places with small dosage. Ultrasonic flowmeter can carry out bidirectional measurement and is easy to install. The technology in water measurement is relatively mature and reliable. According to the actual situation of our company, the installation of primary components is required to be strong and durable, and it can be maintained and cleaned without stopping production. as appropriate. Vortex flowmeter has various types of inserts such as triangular column, rectangular column, T-shaped column, etc. There are two main detection methods. One is to detect the flow change frequency when the fluid vibrates, and use heat, wire or thermistor as sensitive components. The second is to detect the change frequency of the force on the insert when the fluid vibrates, and then use piezoelectric crystals or force-sensitive resistors to detect stress changes, or use resistance strain gauges, capacitive sensors or optical fibers, etc. Detects tiny displacements caused by stress changes. The vortex flowmeter is not affected by the density, viscosity, pressure, temperature and other parameters of the fluid. It has a large range, no pressure guiding tube, and small maintenance amount; small pressure loss, high accuracy, good repeatability, and adaptability to pipe network parameters Great changes; can be easily equipped with various standard signal electrical measuring instruments. It is an ideal flowmeter for metallurgical enterprises to measure the amount of coke oven gas. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'On the Selection of Steam Flow Meters'

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