What should be paid attention to when the vortex flow meter is used for steam measurement

Abstract: What information should be paid attention to when the vortex flowmeter is used for steam measurement? What should be paid attention to when the vortex flowmeter is used for steam measurement? Steam is divided into saturated steam and superheated steam. Generally speaking, the manufacturer of vortex flowmeter will give a table of the mass flow range of saturated and superheated steam for user selection in order to determine the size of the caliber. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of what should be paid attention to when using vortex flowmeters for steam measurement. What should be paid attention to when the vortex flowmeter is used for steam measurement? Steam is divided into saturated steam and superheated steam. Generally speaking, the manufacturer of vortex flowmeter will give a table of saturated and superheated steam mass flow range for users to select, so as to determine the size of the caliber. For superheated steam, temperature and pressure compensation is required, and electromagnetic flowmeter only needs temperature or pressure compensation for saturated steam in the true sense. 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. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'What should be paid attention to when the vortex flow meter is used for steam measurement'

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