Matters needing attention when vortex flowmeter is used for steam measurement

Abstract: Vortex flowmeters are used for steam measurement. The information that should be paid attention to is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Vortex flowmeter for steam measurement should pay attention to the steam is divided into saturated steam and superheated steam, in general, the vortex flowmeter manufacturers will give saturated, superheated steam mass flow range table for user selection, in order to determine the size of the caliber . For superheated steaming. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of the matters needing attention when vortex flowmeters are used for steam measurement. Vortex flowmeter for steam measurement should pay attention to the steam is divided into saturated steam and superheated steam, in general, the vortex flowmeter manufacturers will give saturated, superheated steam mass flow range table for user selection, in order to determine the size of the caliber . For superheated steam, temperature and pressure compensation should be performed, and for true saturated steam, only temperature or pressure compensation should be performed. When measuring, check the density table according to the temperature and pressure to obtain the required mass flow. In the actual measurement, due to the change of working conditions, both saturated steam and superheated steam may deviate from the original design state, which makes the relationship between the density of steam temperature and pressure usually changed, which affects the measurement accuracy. 1. In the flow calculator, the mass flow rate of superheated steam can be calculated according to the temperature and pressure of the superheated steam. However, when the superheated steam is transported over a long distance, or due to improper pipeline insulation measures, the temperature is often lost due to heat. The reduction makes it enter the critical saturation state from the superheated state, and even part of the steam condenses and undergoes a phase change and becomes water droplets, which becomes wet saturated steam (supersaturated steam). The output of the vortex flowmeter is only proportional to the flow velocity of the fluid flowing through the measuring tube. When measuring the humidity and saturated steam, the influence of water droplets on the output of the vortex flowmeter is negligible, so it can be considered that the output of the vortex flowmeter is completely determined by Wetting is caused by the dry part (saturated part) of each steam, and the density of the dry part can be accurately detected according to pressure compensation or temperature compensation. During steam measurement, if the two parties agree to settle the fee according to the dry part of the steam and no charge for the condensate water, the effect of the phase change on the measurement is negligible and can be ignored; if the condensate water is also charged as the steam, the measurement result of the vortex flowmeter is low. 2. Wet saturated steam When the vortex flowmeter is installed in the pressure reducing valve, the wet saturated steam is suddenly decompressed by a large amount, the fluid expands adiabatically, the water droplets partially evaporate, and at the same time absorbs the heat of vaporization from the liquid phase and the vapor phase, so that the steam The temperature of the liquid phase is reduced. If the temperature is not reduced much or the humidity is high before evaporation, the temperature will be rapidly reduced to the saturation temperature corresponding to the new pressure, and a new equilibrium will be established. At this time, the steam is still saturated steam. If the pressure decreases If it is too much or the humidity is low before evaporation, the temperature will still be higher than the saturation temperature corresponding to the new pressure after the temperature is lowered due to the evaporation of water droplets, and the steam will become superheated steam. After the above evaporation occurs, the former has no effect on the compensation, only the dry part in the steam increases, and the dryness increases accordingly. In the latter case, the wet saturated steam becomes superheated steam, and the influence on the flowmeter is as follows Three situations: (1) The design has taken into account that the steam becomes superheated, or it is difficult to determine what state it is in, or sometimes it is superheated and sometimes saturated, so the temperature and pressure compensation is used, the above phase transition has no effect on the measurement results. influences. (2) Considering saturated steam in the design, and using pressure compensation, the above phase transition will bring a small error, that is, the compensation error caused by the density difference corresponding to the difference between the superheated steam temperature and the saturated steam temperature. (3) The saturated steam is considered in the design, but temperature compensation is adopted, that is, the temperature of the superheated steam is regarded as the saturated temperature to check the density table, which generally causes a large error. There are three ways to solve the above problems: (1) Install the total steam flowmeter before the pressure reducing valve. Since the above steam has not been decompressed, there is no phase change problem, so install the flowmeter before the pressure reducing valve, press The saturated steam compensation method can ensure the measurement accuracy. (2) If the flowmeter can only be installed behind the pressure reducing valve, an additional pressure transmitter can be installed for temperature and pressure compensation. (3) If the stability of the pressure reducing valve is good, the upstream pressure value of the flowmeter can be set as a constant value in the display instrument for temperature and pressure compensation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Vortex flow meter for steam measurement should pay attention to'

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