Prominent Features of Vortex Flow Meters for Water Vapor Measurement

Abstract: Information on the outstanding features of vortex flowmeters for water vapor measurement is provided by excellent flowmeter and flowmeter manufacturers. As the name implies, water vapor is a gas phase, but it will become a liquid phase under certain conditions; the water droplets in saturated water vapor are originally liquid phase, but will be evaporated into a gas phase under certain conditions. This is a soda-water phase transition often encountered in steam mass flow measurements. in derivation quality. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the outstanding features of vortex flowmeters for water vapor measurement. As the name implies, water vapor is a gas phase, but it will become a liquid phase under certain conditions; the water droplets in saturated water vapor are originally liquid phase, but will be evaporated into a gas phase under certain conditions. This is a soda-water phase transition often encountered in steam mass flow measurements. In the derivation mass flowmeter, the key link is the calculation of the steam density. After the steam phase change occurs, the relationship between the density obtained from the steam temperature and pressure will change, so it must be taken seriously. (1) Gas phase to liquid phase After the superheated steam is transported over a long distance, it often enters a saturated state from a superheated state due to heat loss and temperature reduction, and even some steam condenses and undergoes a phase change and turns into water droplets. Exactly how much these water droplets affect the flow measurement results is illustrated below. There is a superheated steam with a common pressure of 1.0MPa, and its flow rate is qm. Assuming that 10% of qm condenses into water droplets after long-distance transportation, let it be qm1, and the part that remains in the gaseous state is qms. From the definition, at this time, the wet steam The dryness of is X = (3.22) Since temperature and pressure compensation is used, look up the table according to the critical saturation state, and obtain the steam (dry part) density at this time asρs=5.6808kg/m3, check the water density table to know that the density of the water droplets at this time isρL=882.47 kg/m3, obviously the volume flow of water droplets and steam dry part is qvl=qml/ρ1 (3.23) qvs=qms/ρ2 (3.24) where qv1——volume flow rate of water droplets, m3/s; qvs——volume flow rate of the dry part of steam, m3/s. By definition, the ratio of the volume flow of the dry part of the steam to the total volume flow of the wet steam qv is Rv = (3.25) because (3.26) so Rv = (3.27) In this example, Rv = 99.93%, it can be seen that in In wet steam, the volume ratio occupied by water droplets is negligible. ① The influence of humidity on the measurement results when the vortex flowmeter is selected. The output of the vortex flowmeter is only proportional to the flow velocity of the fluid flowing through the measuring tube. When measuring wet saturated steam, the influence of water droplets on the output of the vortex flowmeter can be ignored. Therefore, it can be considered that the output of the vortex flowmeter is completely determined by Caused by the dry part of the wet steam. The density of the dry part, whether it is pressure compensation or temperature compensation, can be detected more accurately. The results of steam measurement are often used as the basis for economic settlement between the supply and demand sides. If the two parties agree to settle the fee according to the dry part of the steam and no charge for the condensate, then the effect of the phase change on the measurement in this example is negligible and can be ignored. If the condensed water is also charged the same as steam, the measurement result of the vortex flowmeter is low and the value is 1-X. ②Influence of humidity on measurement results when using orifice flowmeter. From the GB/T2624-1993 standard [1], there is formula (3.1) when the orifice plate flowmeter measures the steam mass flow. When the superheated steam loses heat and leaves the superheated state, only two situations can occur. One is to enter the critical saturation state, and the other is to enter the supersaturated state. If it enters the critical saturation state, theoretically speaking, the flowmeter will not increase the error, because in the formula (3.1), the р1 found according to the vapor pressure is consistent with the actual density. If it goes into supersaturation, things get complicated. It is generally believed that the steam dryness is higher (X≥95%) the fluid behaves as a homogeneous flow. Temperature and pressure compensation can be carried out according to the usual method; however, certain errors occur. In formula (3.1), р1 is the density of the wet saturated steam of the actual fluid, and its value is larger than that of the critical saturated state, and the lower the dryness, the higher the density. However, what people find out according to the pressure is the density of the critical saturation state, which is smaller than the actual density, so the result of the mass flow meter has a negative error. In the absence of humidity measurements, X is an unknown, so how low the measurement is is unknown. Low dryness in steam (X≤95%), the fluid in the pipeline flows stratified, resulting in greater errors. (2) Wet saturated steam turns into superheated steam Wet saturated steam turns into superheated steam, which generally occurs when the wet saturated steam is suddenly decompressed by a large amount and the fluid expands adiabatically. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Outstanding Features of Vortex Flow Meters for Water Vapor Measurement'

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