Application Analysis of Vortex Flow Meter in Alumina Production Steam Metering

Abstract: The application analysis information of vortex flowmeter in the measurement of steam in alumina production is provided by excellent flowmeter and flowmeter manufacturers. Abstract: The working principle, selection precautions and installation requirements of vortex flowmeter are analyzed, and the common problems and corresponding countermeasures of vortex flowmeter in the process of steam measurement in alumina production are analyzed. In the process of producing alumina by the Bayer process, steam is transported by alumina enterprises. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application analysis article of vortex flowmeter in alumina production steam measurement. Abstract: The working principle, selection precautions and installation requirements of vortex flowmeter are analyzed, and the common problems and corresponding countermeasures of vortex flowmeter in the process of steam measurement in alumina production are analyzed. In the process of producing alumina by the Bayer process, steam is an important energy source in the operation of alumina enterprises. It is used to heat caustic soda solution and bauxite ore, and it is also used to heat the concentrated and decomposed mother liquor. According to statistics, steam consumption accounts for 40% to 60% of alumina energy costs. For alumina enterprises, steam consumption has become an important part of enterprise cost, and plays a decisive factor in the development and survival of alumina enterprises. 1 Distribution of steam consumption in alumina production and current status First, the level of steam consumption directly reflects the production management and ability of the enterprise to control production. Taking a certain alumina as an example, the comprehensive energy consumption of the process is about 15.72GJ/t-Al2O3, and the steam accounts for about 42%, of which the steam is composed of high-pressure steam and low-pressure steam. Table 1 shows the high and low pressure steam consumption points of an alumina enterprise. Taking Table 1 as an example, there are generally 8 to 10 measuring points for steam in alumina enterprises, the steam consumption ranges from 3.5 to 206 t/h, and the temperature and pressure are also different. At present, two types of steam measuring instruments are usually used in alumina enterprises. One is based on the principle of Bernoulli equation, such as differential pressure orifice plate, sonic nozzle, Annubar, Delta Bar, balance type, etc. Among them, the differential pressure orifice plate, Annubar, and Delta are more accounted for; the other type is based on the principle of linear continuity equation, such as vortex flowmeter and mass flowmeter, due to the high price of mass flowmeters and high temperature conditions. The lower accuracy is lost, so the vortex flowmeter is mostly used for measurement. The steam metering instrument based on the Bernoulli equation principle, its flow metering equation is (1): Equation (1) shows that, on the one hand, due to the existence of the density of the medium steam in the equationρf. Therefore, the calibration of measuring instruments is very troublesome and often inaccurate in alumina enterprises. Most of the production plants use water calibration. The accuracy of this method does not represent the accuracy of measuring steam. On the other hand, since there is also an expansion coefficient τ of gas in equation (1), the expansion coefficient is different for different steam, different pressure and different temperature conditions. Therefore, even if compressed air is used for calibration Accuracy also does not represent the accuracy of measuring steam. 2. Working principle of vortex flowmeter 3. Design and selection of steam measurement in alumina production Taking Table 1 as an example, alumina enterprises need about 8 to 10 measurement points for steam, which are generally superheated steam, and the mathematical model is binary. function, therefore, pressure and temperature double compensation needs to be considered in the design. 3.1 Selection of process parameters Factors to be considered in the design and selection include: the range of flow parameters, the range of pressure parameters, the range of temperature parameters, and the flow rate to select the diameter. At the same time, the following principles are followed: (1) In the case of the highest pressure, consider whether the minimum flow is within the working range of the diameter; (2) Consider whether the maximum flow exceeds the working range of the diameter in the case of the lowest pressure; When the temperature corresponds to the pulse output, the expansion coefficient of the width of the generator should be considered, and the flow coefficient Kt under the working temperature conditions: where: T is the working temperature; K is the standard flow coefficient (generally on the nameplate of the instrument). 3.2 Selection of diameter When designing and selecting, considering the reduction of pressure loss, there are certain requirements for the lower limit of flow when measuring steam. The diameter of the flowmeter should be selected according to the size of the steam flow, not the inner diameter of the original pipeline. Select the flowmeter diameter. The selection of the diameter of the steam flowmeter can be verified by the table look-up method and calculation. The look-up table method is to check the flow path on the product sample according to the range table of steam measurable flow under the working condition pressure; then calculate and verify whether the flow rate and Reynolds number are within a certain range. (1) Velocity calculation: The steam velocity range is generally 2m/s~60m/s, and the highest should be <80m/s. V=4×Q/(3600×π×D×D) (6) Among them: V is the flow rate; Q is the volume flow; D is the diameter of the flow meter. (2) Reynolds number calculation method: ① The Reynolds number at the lowest flow rate shall not be less than 5000; ② the Reynolds number at the minimum flow rate with guaranteed accuracy shall not be less than 20000. Re '【(ρ×V×D) /μ ] (7) Among them: V is the flow rate;ρis the density;μThe viscosity of the medium; D is the diameter of the flow meter. Of course, some products can provide computer selection software, directly input the relevant process parameters, you can get ideal results.

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