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2022-07-27 16:25:06
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What do you know about Coriolis mass flowmeters in real situations? In this issue, the editor will tell you about the application requirements of the Coriolis mass flowmeter in the field of liquid hydrogen? let's figure it out together?
Hydrogen is a clean, high-efficiency, zero-carbon energy carrier with various sources. It plays the role of fuel and raw material in heating, transportation, power generation and other fields, and also realizes the transformation between various energy types such as electricity, heat, and liquid fuel. important medium. Hydrogen metering technology is involved in hydrogen production, preparation and custody transfer. However, the existing flowmeter products that can directly measure the flow of liquid hydrogen are lacking.
Liquid hydrogen has certain special characteristics. Compared with low-temperature fluids such as LNG and liquid nitrogen, the temperature of liquid hydrogen is lower, and the thermal properties such as density, viscosity, and sound speed are also significantly different, and the difference with normal temperature medium water is even more significant. . In addition, liquid hydrogen also has the characteristics of flammability and explosion, which makes the experimental research of liquid hydrogen equipment high risk and difficult. At present, liquid hydrogen flowmeters mainly include turbine flowmeters and differential pressure flowmeters. Turbine flowmeter has the advantages of high precision and wide measurement range, but when measuring liquid hydrogen, cavitation is easy to occur at the impeller, which reduces the measurement accuracy. The orifice flowmeter has a simple structure and no moving parts. It is widely used in the field of low temperature fluid measurement. However, cavitation is easy to occur at the throttle orifice, which affects the outflow coefficient and pressure loss coefficient, and affects the measurement accuracy.
Coriolis mass flowmeter (referred to as Coriolis mass flowmeter) utilizes the influence of the Coriolis effect on the vibration phase on both sides of the pipe when the fluid flows through the vibrating pipe to directly measure the mass flow of the fluid. In the cryogenic field, Coriolis mass flow meters have been widely used to measure the mass flow of liquefied natural gas (LNG), liquid nitrogen, etc. Some scholars have pointed out that the Coriolis mass flowmeter is an effective means to solve the problem of liquid hydrogen gasification in the flow measurement process. Although there is still no commercialized liquid hydrogen Coriolis mass flowmeter, and related research is relatively lacking, with the rapid development of the hydrogen energy industry, the application demand of Coriolis mass flowmeter in the field of liquid hydrogen can be foreseen.
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