Measuring the flow rate of gas-liquid two-phase flow with variable liquid level method

Measuring the flow of gas-liquid two-phase flow using the variable liquid level method The four methods mentioned above are not perfect for measuring the flow of gas-liquid two-phase flow, because the measurement they can achieve is the same as the measurement requirements proposed in Section 3.7.2. Big difference. Of course, if some measurement objects only need to know the volume flow or mass flow of the gas-liquid mixture, these methods may be put into practical application. However, if it is necessary to further know the mass flow rate of each phase or the mass content of the gas phase flow rate, it is necessary to find another way. Among them, the gas-liquid two-phase is first separated, and then, the mass flow rate of the gas-liquid two-phase is measured respectively by the method of measuring the single-phase flow rate (if necessary). Fig. 3, 94 shows the variable liquid level flowmeter with the liquid reservoir fixed The structure is schematic. It is often used to measure the oil flow in gas-bearing oil. It can be seen from the figure that the mixture of oil and gas enters the separation chamber 2 tangentially from the pipe 1 to separate the gas and liquid. After the gas passes through the separation chamber, it flows into the liquid reservoir 4, and then After flowing into the lower part of the container 6 through the slot 7, it flows out together with the gas through the tube 5. The liquid reservoir is equipped with a separator 3 for stabilizing the liquid level, and the liquid level in the liquid reservoir 4 can be measured by a differential pressure gauge. Determine the static pressure of the middle liquid column. According to the read differential pressure, the liquid level height can be determined^ and then the liquid volume flow rate^ can be calculated according to the corresponding calculation formulas (a slot of a shape corresponds to a calculation formula). Please refer to literature [53] for details. In fact, the combination of a flowmeter that is only applicable to single-phase flow and a gas-liquid separator is used to measure some parameters in the gas-liquid two-phase flow. The most widely used is the measurement of saturated steam flow. Saturated water vapor is transported over a long distance, and part of the steam becomes condensed water due to heat loss, and the fluid in the pipeline becomes a gas-liquid two-phase flow, which affects the normal operation of flowmeters with certain principles. A common practice is to install a gas-liquid separator before the flowmeter, and then discharge the liquid through the trap. The steam after gas-liquid separation can be approximately regarded as a single-phase flow, so it can be measured with a general flowmeter.

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