Explanation of the application of metal tube rotameter meter in gas-liquid two-phase medium under working conditions

Abstract: The information on the application of the metal tube float flow meter in the gas-liquid two-phase medium in the working condition is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. In recent years, the ion-membrane alkali-making process in my country's chemical industry has developed rapidly. In the past few years, most of the devices were imported in full, including various online instruments. Now the equipment and instruments are gradually localized, which can not only ensure the quality, but also save a lot. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application of the metal tube float flowmeter in the working condition of gas-liquid two-phase medium. Details of the article. In recent years, the ion-membrane alkali-making process in my country's chemical industry has developed rapidly. In the past few years, most of the devices were imported in full, including various online instruments. Now from the equipment to the instrument, it is gradually localized, which can not only ensure the quality, but also save a lot of foreign exchange. During the trial production stage of a large-scale chemical plant in Northwest China, it was found that the two rotameters installed on the anode and cathode pipes were not working properly. Process adjustment and control objectives, etc., and even affect the normal production. After on-site observation and analysis, it is believed that the measured media in the cathode and anode pipelines are both gas and liquid dual-phase media with non-uniform, unfixed proportions; and the flowmeter is a conventional float flowmeter. One of the working principles of the metal tube rotameter is the law of buoyancy, which is related to the density of the measured medium. When the density is unstable, the float will jump. Due to the fact that the liquid is accompanied by an indeterminate gas volume in this working condition, a pulsating flow is generated, which leads to the above phenomenon of the flowmeter. At present, various conventional flow meters are not suitable for gas and liquid dual-phase media, and the flow of salt liquid and alkali liquid in the process must be measured and controlled, that is, flow meters must be installed. Therefore, selecting an available flowmeter or improving the design of an existing flowmeter to meet the measurement requirements of this specific working condition becomes the next step. The selection and determination of the implementation must meet at least the following three points: (1) the wetted parts of the flowmeter must be able to withstand the strong oxidation and corrosion of chlorine-containing salt liquid and alkali liquid in the anode and cathode pipes; (2) installation and connection The size should be the same as the original flowmeter as much as possible to reduce the workload; (3) The flowmeter itself can effectively buffer and reduce the violent fluctuation caused by the randomly generated gas to achieve a reading that can be regarded as a stable value, and the output current signal fluctuation meets the requirements Regulate system requirements. According to the above requirements, after analyzing and comparing electromagnetic flowmeters, turbine flowmeters, vortex flowmeters, rotameters and differential pressure flowmeters, it is believed that only necessary improvements to metal tube rotameters are feasible and the most efficient. best plan. Therefore, the instrument specially designed a metal tube float flowmeter on the basis of its original product. Three improved designs should be implemented for the metal tube rotameter. For the selection of corrosion-resistant materials and anti-corrosion measures, please refer to the metal material manual and combine the actual application of other equipment materials on site. The medium in the anode pipeline is salt solution containing chlorine gas, and all the parts in the sensor that are in contact with the medium are made of titanium (Ti) material. The sealing surfaces of the two flanges and the sealing surfaces of the casing and the conduit assembly are all treated with palladium. The whole sensor has good anti-oxidation and corrosion resistance. The medium in the cathode pipeline is lye, hydrogen and chlorine, etc. All the parts in the sensor in contact with the medium are made of stainless steel (SUS316L), and the entire sensor has good corrosion resistance. It has been proved to be feasible after more than two years of use. Connection size and installation method Since the original flowmeter of the user is installed horizontally, which is completely different from the vertical installation of the conventional float flowmeter and the flow direction of the fluid from bottom to top, it must be designed to be (horizontal) horizontal (horizontal) horizontal. Out of the structure, since the opening size of the existing pipeline is long enough, it is designed as a float flowmeter as shown in Figure 1. To maximize the stability of the flowmeter under working conditions As far as the flowmeter itself is concerned, a common and effective measure to overcome fluctuations (whether caused by external or internal reasons) is to install a damper. Dampers are generally divided into mechanical and electrical (magnetic) types. Obviously, the former should be considered first for rotameters. According to the different damping medium, it is divided into liquid damper and gas damper. Design of the damper The damper must understand and determine the following data: Fluctuation amplitude and frequency: After several hours of observation and statistics on the site, the fluctuation amplitude of the flowmeter without the damper is about 15%~25%, (±7.5%~±± 12%); the frequency is about 180~350 times/min. (1) The damping effect is required: the fluctuation range should not be greater than ±2%; the frequency should not be greater than 50~90 times/min. Of course, since there is no proper instrument for quantitative detection, whether the final effect of damping achieves the expected goal,To a certain extent, it should also be judged and identified by on-site technicians and operators through practical applications. (2) According to the above-mentioned actual working conditions and damping objectives, taking into account the structure size of the rotameter and the specification of the titanium pipe material, etc., after obtaining the damping coefficient, the structure and size of the damper are preliminarily determined, as shown in Figure 2. The optimal size of the gap between the damping chamber and the damping body, which determines the damping effect, can only be determined after field tests. During the test, there is naturally air at the upper end of the metal tube rotameter as a damping medium.

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