Experimental Test and Analysis of Steam Flow Meter

Abstract: The experimental test analysis information of steam flow meter is provided to you by excellent flow meter and flow meter manufacturers. 1. Experimental device The experimental devices used in this research are the standard device for steam flow measurement by condensation weighing method, the standard device for gas flow measurement by negative pressure method with sonic velocity nozzle, and the standard device for water flow measurement by mass method. Among them, the condensation gravimetric method of steam flow measurement scale. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the steam flowmeter experimental test analysis article. 1. Experimental device The experimental devices used in this study are the standard steam flow measurement device by condensation weighing method, the standard device for gas flow measurement by negative pressure sonic nozzle, and the standard device for water flow measurement by mass method. Among them, the condensing weighing method steam flow measurement standard device is the first domestic flow standard device that adopts real steam flow calibration. The principle is shown in Figure 2. Using superheated steam as the verification medium, the principle of condensing and weighing the steam passing through the steam flow meter is used to calibrate the steam flow meter. The gas device is a standard device for measuring the gas flow rate of the sonic nozzle by the negative pressure method. The water device is a standard device for mass-method water flow measurement, the expanded uncertainty is 0.05% (k=2), and the verification flow range is 0.05-200, m3/h. 2. The experimental scheme installs steam flow meters of different manufacturers, models and calibers on the steam device, air device and water device according to the requirements of the national verification regulations for steam flow meters [12]. The steam device is tested at a temperature of 150, ℃, the pressure is tested under the conditions of 0.35, MPa, the test flow is sequentially from the minimum flow to 20%, 40%, 60%, 80%, 100% of the maximum flow, a total of 6 flow points, each flow point Repeat the test 3 times. At present, nearly 100 steam flowmeters have been tested and tested, the unqualified steam flowmeters have been eliminated, and the experimental results of these steam flowmeters have been summarized. ． This paper only analyzes the experimental data of the representative DN50 and DN100 steam flowmeters, and compares the changes of the meter coefficients at different flow points under different fluid conditions. 3. The experimental data has passed the experimental test under 3 sets of different fluid media, the instrument coefficient and instrument coefficient deviation under the 3 sets of devices and the instrument coefficient deviation E obtained by analysis and calculation′, E′a.E′a.E′e, as shown in Table 5, the curve relationship between the meter coefficient and the flow rate is shown in Figure 3 and Figure 4. It can be seen from the experimental data that the meter coefficient of the steam flowmeter decreases in turn under the conditions of air, water and steam fluids, and the air And the meter coefficient of each point of steam fluid medium increases with the increase of flow rate, which is consistent with the theoretical calculation and analysis. According to the accumulated experimental data, air is 0.2%~1.0% larger than the K value measured by water as the fluid medium, and 1.5%~3.0% larger than the K measured by steam as the fluid medium. The deviation of the K value of the instrument coefficient depends on the instrument Manufacturers and specifications vary, but the positive and negative trends of the deviation are basically the same. (1) When measuring high temperature steam, it is necessary to consider the influence of linear expansion caused by temperature, otherwise the instrument coefficient will be too large. The measurement error caused by the temperature can be compensated according to the formula derived in the article. (2) The influence of the compressibility of the gas on the instrument coefficient of the steam flowmeter is affected by the flow rate u of the medium, the pressure p, the densityρ and the influence of related parameters such as the isentropic index κ, which is proportional to the flow rate u, and is proportional to 11p/ρ The change of is inversely proportional to the change of gas isentropic index κ will not cause the unidirectional change of the instrument coefficient. (3) The compressibility of different media will have an impact on the instrument coefficient of the steam flowmeter. In the air medium, the instrument coefficient is the largest, followed by water. The steam is the smallest. Under the same flow rate, the influence of the steam medium on the instrument coefficient is smaller than that of the air. The specific difference can be obtained by analysis and calculation under the working conditions. (4) According to the experimental data, the steam flowmeter instrument measured under different media The coefficient is consistent with the theoretical calculation and analysis, but there is still a certain deviation between the two results, which may be due to the influence of other physical parameters of the medium on the instrument coefficient. In-depth theoretical analysis is required, and real-flow calibration is used as much as possible in actual use. Obtain the meter coefficient. Steam flowmeter, carbon dioxide flowmeter, acetylene flowmeter, ammonia gas flowmeter The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Experimental Test Analysis of Steam Flow Meter'

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