Industry Analysis of Pitot Tubes of Flow Meters in Energy Detection

Abstract: The industry analysis information of the pitot tube of the flow meter in the energy detection industry is provided by the excellent flow meter and flow meter production and quotation manufacturers. In energy monitoring instruments, in addition to electric energy meters and weighing instruments for solid coal, other gaseous and liquid energy sources (such as crude oil, refined oil, heavy oil, residual oil, natural gas, liquefied gas, coal gas) and energy-carrying working fluids ( water, steam) must use a flow meter. For more flow meter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the industry analysis article of the flow meter's pitot tube in energy detection. In energy monitoring instruments, in addition to electric energy meters and weighing instruments for solid coal, other gaseous and liquid energy (such as crude oil, refined oil, heavy oil, residual oil, natural gas, liquefied gas, coal gas……) and the energy-carrying medium (water, steam) must use flow meters. Even for solid energy coal, flushing plate flowmeters or gas-solid two-phase microwave flowmeters can be used during continuous operation in the process industry. Therefore, the flow meter has a pivotal and irreplaceable position in the energy monitoring instrument.“Eleventh Five”During this period, the central government will make the greatest determination and regard energy saving and consumption reduction as the top priority in economic construction. While ensuring the doubling of GDP, the energy consumption per unit of output value should be reduced by 20% within five years. my country's industrial energy consumption accounts for 68% of the total energy, and the people's daily energy consumption only accounts for 11.4%. Therefore, the focus of energy conservation should be placed on industry, especially in high energy-consuming industries, such as electricity, metallurgy, steel, petrochemical, building materials, transportation, etc. . Comparison of several energy monitoring flow meters 1. Throttling device: Differential pressure is generated based on throttling, and the flow rate can be known by measuring the square root of the differential pressure. For a long time, these instruments have occupied 60~70% of the market of flow instruments because they can withstand harsh working conditions and have been based on international standards, and there are as many as 20 or 30 types. 2. Plug-in type: simple structure, convenient installation, low price, and can be continuously installed and folded, but the accuracy is low, only suitable for large pipeline flow detection, and can be used in energy monitoring where the accuracy is not high. ①Measuring point speed: an instrument that calculates the flow rate by measuring the flow rate at a point in the pipeline, such as a double venturi tube; plug-in vortex street, turbine, electromagnetic, pitot tube. According to ISO7145 evaluation, the accuracy is±3%, if the straight pipe section is less than 30D, the accuracy will be lower than±5%*3. Among them, L-type pitot tube parameters: ◎ Pitot tube measurement medium: gas or liquid compatible with 304 stainless steel. ◎The main purpose of the pitot tube: to measure the total pressure, static pressure, dynamic pressure (ie differential pressure) in the pipeline, and to calculate the flow rate and flow. ◎Pitot tube instrument connection: It can be connected to various pressure instruments (such as U-shaped pressure gauge, inclined micro pressure gauge, inclined tube differential pressure gauge, digital micro pressure gauge, compensation micro pressure gauge, etc.) and differential pressure transmitter, secondary pressure gauge, etc. Instruments and imported various pressure instruments. ◎Pitot tube operating temperature:≤600℃◎Execution standard: National standard JJG518-98◎Pitot tube operating humidity:≤HR45%◎Measuring velocity range: air velocity≤40m/s; water velocity≤25m/s◎Standard coefficient of pitot tubes: L-type pitot tubes are between 0.99 and 1.01; S-type pitot tubes are between 0.81 and 0.86. Recently, a measuring tube similar to a deformed pitot tube was launched on the market. The biggest advantage is that it is not easy to block. Three tubes are placed above the pipeline. Each tube needs a differential pressure transmitter, which is expensive. It is said to be designed according to ISO3966, but does not meet the requirements of the standard to arrange 20 measuring points in the cross section. The relevant article has made an error analysis*4, and has not considered the interference coefficient that affects the accuracy the most when the velocity distribution is not ideal.γ*5. Therefore, the measurement error will exceed±3%. ②Measuring the radial multi-point flow velocity: the typical instrument is the uniform velocity tube. Due to the many measuring points, the accuracy can be better than that of the plug-in flow meter that measures the velocity of the point. Usually, only the multi-point flow velocity in the diameter direction of the cross-section is measured. When the accuracy needs to be improved, two equal-velocity tubes of 900 can also be inserted, which is more in line with the measurement point requirements of ISO3966. 3. Flow meter without resistance parts. This type of instrument is characterized by simple mechanical structure, no resistance parts in the pipeline, small pressure loss and high accuracy. 10.4%, 6.9%, 2.4%. Development trend: At present, there are many types of flow meters, which are in a“Spring and Autumn and Warring States Period”However, with the rapid development of science and technology, new instruments such as electromagnetic, ultrasonic, and Coriolis are increasingly favored by users because of their simple structure and perfect functions. The classic type (orifice plate, nozzle, venturi) or due to the large pressure loss, the straight pipe section is required to be too long and difficult to meet, and the market development shows a downward trend, with an annual growth rate of -2.3%. New throttling devices are constantly emerging, so it will be a long process for new flow meters to replace classic traditional meters, not overnight. In addition to measuring the speed of the aircraft, the pitot tube also has many other functions. In scientific research, production, teaching, environmental protection, as well as tunnels, mine ventilation, and energy management departments, pitot tubes are often used to measure the airflow velocity in ventilation pipes, industrial pipes, and furnace flues. After conversion, the flow rate can be determined, and the water flow in the pipes can also be measured. speed. Using a pitot tube to measure speed and determine flow has a reliable theoretical basis, is convenient and accurate to use, and is a classic and extensive measurement method. In addition, it can also be used to measure the pressure of fluids. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Industry Analysis of Pitot Tubes of Flow Meters in Energy Testing'

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