Discussion on the knowledge of using mass flow meter in the flow measurement of liquefied petroleum gas

Abstract: The information on the knowledge discussion of the mass flow meter in the flow measurement of liquefied petroleum gas is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. LPG is not only the main product of refining and chemical enterprises, but also one of the important raw materials. Because the physical properties of liquefied petroleum gas have its particularity compared with other petroleum products (such as gasoline, kerosene, diesel oil, etc.), it will affect the stable operation and measurement accuracy of the flowmeter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article discussing the knowledge of using mass flow meters in liquefied petroleum gas flow measurement. LPG is not only the main product of refining and chemical enterprises, but also one of the important raw materials. Because the physical properties of liquefied petroleum gas have its particularity compared with other petroleum products (such as gasoline, kerosene, diesel oil, etc.), it has a greater impact on the stable operation and measurement accuracy of the flowmeter, so it has become a major problem in the flow measurement of refining and chemical enterprises. . Through more than ten years of continuous exploration and improvement of measurement methods and methods, and thanks to the maturity of flowmeter technology in the past ten years, we have solved this problem relatively well. The following two aspects introduce our approach. 1. The main reasons that affect the stability and accuracy of LPG flow measurement The main components of LPG are propane, propylene, butane and isobutene. Due to the different technological processes and different processing methods of various refining and chemical enterprises, the types of LPG sold or purchased are also different. For the convenience of discussion, the author gives several physical constants of the main components in Table 1. 1. Influence of saturated vapor pressure on measurement accuracy It can be seen from Table 1 that the saturated vapor pressure of liquefied petroleum gas is much higher than that of other petroleum products. Therefore, in the flow measurement, if the back pressure of the flowmeter is not higher than its vapor pressure, two phases of gas and liquid will be generated in the measuring chamber of the flowmeter. Whether for volume measuring instruments (such as turbine flowmeters or positive displacement flowmeters) or mass flowmeters, the presence of gas and liquid phases in the fluid will directly affect the measurement accuracy, and sometimes this effect will be great. The size of the influence is related to the type of flow meter, and it is also related to the size of the gas content percentage. The impact on the turbine flowmeter is greater than that on the positive displacement meter and mass flowmeter, and the greater the gas content ratio, the greater the impact. Especially for the indirect delivery process like the loading and output system, during the period of stopping the pumping volume, the pressure in the pipeline will decrease, and a large amount of gas phase will be generated. When the pumping volume is turned on next time, the gas phase flows through the meter at a high speed, which will cause the rotor of the turbine or positive displacement flowmeter to rotate at a high speed, which will cause great damage to the meter, sometimes directly causing damage to the meter. Table 1 Several physical constants of the main components of LPG 2. The influence of poor LPG self-lubrication on the service life of the flowmeter that's what people call a comparison“astringent”, causing serious wear between the rotor shaft and the stator bearing, between the rotor and the inner wall of the metering cavity, which directly affects the life of the flowmeter. At present, the turbine flowmeter using tungsten carbide steel as the shaft and bearing is slightly better to use, and the continuous operation can generally reach 1 to 2 years. Ordinary shafts or bearings can only be used for 3 to 6 months. 2. Take avoidance measures 1. Selection of flowmeter According to our years of experience and the above analysis of the physical properties of liquefied petroleum gas, we believe that the first choice is mass flowmeter, followed by cemented carbide as shaft and bearing turbine flowmeter . The price of mass flow meters is generally 3 to 5 times higher than that of turbine flow meters. The current actual usage of our company is: mass flowmeters for foreign trade transfer, accounting for about 10%, and turbine flowmeters for material transfer measurement between in-plant devices, accounting for about 90%. In terms of technical performance, service life, measurement accuracy, operational stability and maintenance workload, mass flow meters are superior to turbine flow meters. But in terms of one-time investment, turbine flowmeters are much more economical than mass flowmeters. Through the above comparison, we believe that it is necessary to use mass flow meters in foreign custody transfer measurement. Although the one-time investment is large, its technical performance is far superior to the turbine flowmeter. First of all, there are no moving parts in its metering cavity, which overcomes the influence caused by the poor self-lubrication of the fluid. At the same time, it directly measures the handover quality of the fluid, while the turbine flowmeter measures the volume of the fluid. In order to convert the handover mass, it is necessary to measure the temperature, pressure, density and other parameters of the fluid.

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