Application of Mass Flow Meter in Flow Measurement of Liquefied Petroleum Gas

Application of mass flowmeter in liquefied petroleum gas flow measurement! The main components of liquefied petroleum gas are propane, propylene, butane and isobutene. Due to the different technological processes and processing methods of various refining and chemical enterprises, the types of liquefied petroleum gas 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. The 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 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 flowmeter measurement cavity. Whether it is a volume measuring instrument (such as a turbine flowmeter or a positive displacement flowmeter) or a mass flowmeter, the existence of gas and liquid phases in the fluid will directly affect the measurement accuracy, sometimes greatly. The size of the impact is related to the type of flowmeter, and also related to the size of the gas content percentage. The impact on the turbine flowmeter is greater than the impact on the positive displacement instrument and mass flowmeter, the greater the gas content ratio, the greater the impact. Especially for the process of indirect delivery like the loading output system, during the period of stopping the pump delivery, the pressure in the pipeline decreases, and a large amount of gas phase will be generated. When the pump is turned on next time, the gas phase flows through the instrument at high speed, which will cause the turbine or the rotor of the positive displacement flowmeter to rotate at high speed, which will cause great damage to the instrument, and sometimes directly cause damage to the instrument. 2. The influence of poor self-lubrication of liquefied petroleum gas on the service life of the flowmeter. When the mass flowmeter uses a turbine or positive displacement flowmeter to measure liquefied petroleum gas, due to the poor self-lubrication of liquefied petroleum gas, it is often said to be 'astringent'. , resulting in severe wear between the rotor shaft and the stator bearing, between the rotor and the inner wall of the metering chamber, which directly affects the life of the flowmeter. At present, the turbine flowmeter with tungsten carbide hard alloy steel as the shaft and bearing is slightly better in use, and the continuous operation can generally reach 1 to 2 years. Shafts or bearings made of ordinary materials can generally only be used for 3 to 6 months.

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