Natural gas flow meter measurement method

Abstract: The information on the measurement method of natural gas flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. In the process of commodity trading, there is an important parameter, the quantity of commodities, and natural gas as a commodity is also inseparable from the quantity of commodities in market transactions. Natural gas needs to be measured by the meter to get the size of the gas volume, and then convert its value into currency. If you don't know natural. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the measurement method of natural gas flowmeters. There is an important parameter in the process of commodity trading———The amount of commodities, natural gas as a commodity in market transactions is also inseparable from the amount of commodities. Natural gas needs to be measured by the meter to get the size of the gas volume, and then convert its value into currency. A trade settlement cannot be made without knowing the amount of natural gas. Therefore, it can be said that without the accurate measurement of natural gas, it is impossible to carry out transactions in the commercial natural gas market. Measurement involves various sectors of the national economy and many aspects of people's lives, and is an important technical basis for the national economy. The basic feature of metrology is measurement, but the measurement tool is not a general product, but a measuring instrument with uniformity, accuracy and a certain level of accuracy. In terms of technical and legal management requirements, measurement is higher than general measurement. Metrological verification is the process of transferring the value according to the national metrological verification system table. Quantity transfer is to pass the unit quantity value reproduced by the measurement benchmark to the next-level measurement standard through metrological verification, and then pass it to the working measuring instrument step by step. . After the measuring instrument is verified by the legal metrological verification agency according to the national metrological verification system table, it can be traced to the national metrological standard to ensure the accuracy and reliability of the measurement value. All measuring instruments that are subject to compulsory verification as stipulated in the National Metrology Law shall be subject to fixed-point and periodic verification by the legal metrology institutions or authorized metrological verification institutions designated by the metrological administrative departments of the people's governments at or above the county level. The person shall submit it to the designated legal metrological verification institution for inspection or entrust an authorized metrological verification institution for verification according to the specified period. The measurement of natural gas in my country is often expressed in volume, and the legal unit is m3. The volume of natural gas varies with the temperature and pressure of the natural gas. In order to facilitate comparison, a certain state must be specified as the standard state. my country stipulates that the standard state of natural gas flow measurement is: the absolute pressure is 0.101325MPa, and the temperature is 293.15K. If it is not specified as the natural gas flow under the working state, it generally refers to the volume flow of natural gas under the above-mentioned standard state. There are many methods of natural gas flow measurement, and there are many flow instruments available, which are roughly divided into the following three types according to the working principle: 1) Differential pressure flowmeter: In the current pipeline natural gas measurement, more than 95% of the standard orifice differential pressure type is still used. The flowmeter calculates the volume flow of natural gas according to the empirical formula by indirectly measuring the pressure, differential pressure and temperature of natural gas flowing through the standard orifice plate. The secondary instruments used to measure various indirect quantities require recording or accumulating functions, so the differential pressure flow measurement systems are roughly divided into two categories, namely CW double bellows differential pressure and absolute pressure recorders (with glass rod thermometers). ) and computerized automatic metering systems. Since the standard orifice plate needs to be cleaned and verified every (2 to 3) months, the orifice plate is frequently loaded and unloaded from the pipeline pressure-taking device. In order to keep the roughness not exceeding the standard, it is best to carry out anti-corrosion treatment, because once these parts are installed, they will not be disassembled as long as there is no damage. 2) Positive displacement flowmeter: The gas waist wheel flowmeter is also called Roots flowmeter, which is a typical positive displacement flowmeter and is mostly used to continuously measure the total amount of gas (cumulative flow) flowing through the pipeline. The principle is that a closed chamber is formed between the rotor and the casing, that is, the measuring chamber. The rotor of the waist wheel flowmeter is a pair of waist wheels which are conjugate curves of each other. Installed coaxially with the waist wheel is the drive gear. When the fluid to be measured passes through the flow meter, differential pressure is formed between the inlet and outlet to push the belt wheel to rotate, and the belt wheels are driven by driving gears. Every time the waist wheel rotates, the fluid discharged is a fixed value, that is, the discharge volume is proportional to the number of revolutions of the waist wheel shaft. Therefore, as long as the volume of the metering chamber formed by the waist wheel and the flowmeter housing and the number of rotations of the waist wheel are known, the volume flow of the gas can be calculated. By measuring the rotational speed of the waist wheel, the flow rate per unit time can be obtained, that is, the average instantaneous flow rate. The displayed value of the positive displacement flowmeter is generally the volume flow under the working conditions, and the conversion to the standard state is manually calculated, and the temperature and pressure values ​​are long-term average or estimated values. 3) Velocity flowmeter: It is a flowmeter based on the principle of directly measuring the flow velocity of full pipe flow in a closed pipe. Including turbine flowmeter, vortex flowmeter, precession vortex flowmeter, ultrasonic flowmeter, etc.

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