Outer clamp type ultrasonic flowmeter in the application of wet zinc smelting system practice

Using wet processes of zinc smelting enterprises, supernatant liquid, new liquid impurity constantly between different zinc sulfate solution in each process flow, liquid flow of accurate measurement is very necessary. Flow measurement data is accurate, to the amount of each reaction tank to join all kinds of medicament to dynamic control accurately, not add much wasteful, also not to join the less the reaction is not sufficient, thus ensuring leaching processes process to purify the supernatant fluid and purification steps taken to the quality of the new liquid and liquid electrolytic process. But because of the zinc sulfate solution easy to crystallization, and more or less easy to precipitation of impurities, therefore, the use of all kinds of differential pressure flowmeter ( Such as orifice plate, and the power, V cone, etc. ) Is very appropriate, and it is easy to cause the throttle device pipeline jam, companies are not using this kind of flow measurement device. But the application of electromagnetic flow meter in the working condition of the environment or common, each design unit is also the basic use of electromagnetic flowmeter is recommended. Shaanxi XinYe co. , LTD. In wet zinc smelting system has extensive use of electromagnetic flowmeter, at first, when using can also measure effect, but generally use more than 2 months later, because of the zinc sulfate solution crystallization and precipitation within the impurities in the process line hanging wall effect, such as electromagnetic flowmeter sensor will be covered by solid matter, so that the flow meter. And because of the flow meter installed directly on the process piping, cannot remove in the process of production, so after the electromagnetic flowmeter sensor is covered by solid matter, it is hard to repair in time, over time, became a decoration. So the new test method of measuring wet system it is necessary that the liquid flow rate. After inspecting demonstration, we decided to outside the wet system gradually adopted non-contact type ultrasonic flowmeter for liquid flow measurement, and use effect is very good. 1. Clip-on outside the characteristics of ultrasonic flowmeter the working principle of ultrasonic flowmeter is: the propagation velocity of sound waves in different fluid is different, and positively related to the fluid velocity, calculated by the waves of positive and negative 2 road 2 road acoustic time difference, the fluid velocity can be calculated. Using velocity on cross-sectional area is the traffic. Specific measurement way is in fluid upstream and downstream of a can emit ultrasonic sensor probe, the launch of the ultrasonic probe upstream, downstream of the probe to receive, to create a transfer time, The following is called A) time Upstream and downstream of the launch of the ultrasonic probe, probe, and generate a transmission time ( The following is called time B) That time A and B is not equal, their time difference, and there is A certain fluid flow function relation. Is the flow velocity of fluid was also carried on the ultrasonic wave. So through the calculation of uninterrupted time lag time A and B, can be continuous to measure the instantaneous flow rate of the fluid. Time lag, and the fluid flow relationship meets the following expressions: V = ( MD / sin2θ ) x△T/( tup·tdown) ( 1) Type in a fluid flow velocity V, m/s. θ A beam with the liquid flow direction Angle; M a beam in the liquid line number; A pipe diameter D, m; Tup a beam in the tetragonal upward propagation time, s; Tdown a beam on the inverse direction of travel time, s. △T =公羊- Tdown outer clamp type ultrasonic flowmeter ZUI don't need to be truncated when installation media is the feature of process piping, also do not need to open hole in the pipe, as long as the sensor in a specified way clamp on the pipe can be measured, and high measuring accuracy, stable performance. Because the sensors on the outside of the pipe, maintenance is very convenient, also can be done at any time in the process of production on the rails. 2. Clip type ultrasonic flowmeter selection considerations for external clip-on ultrasonic flowmeter selection is appropriate, will directly affect the measurement precision and service life. Selection should be the scene of the investigation and understanding of the process when the following questions, 1) Installation and measurement host installed in the sensors are ( 2) Medium piping material, pipe wall thickness and diameter; ( 3) The medium inside the pipeline type; Whether medium containing impurities, bubble and is full of pipes; ( 4) The temperature of the medium. ( 5) Whether there is interference sources on site measurement, ( 6) Plan the location of the temperature and humidity measuring the main; ( 7) Working condition of the scene can use the power supply voltage is stable; ( 8) Whether you need remote signals and type of remote transmission signal, transmission distance, etc. Has been clear about the process, the scene of the above situation can be targeted for selection, the selected products more applicable to the economy. 3. Outer clamp type ultrasonic flowmeter sensor installation location choice of outer clamp type ultrasonic flowmeter sensor is holding to the outside of the measurement point line, its installation is in the installation of all types of flowmeter ZUI simple and convenient, don't need to cut pipe, also don't need a hole in the line, just select a suitable position as a measurement point in the line of the pipeline parameters will be here by the smart panel input into the host of flowmeter, again to bundle sensors in the measurement point of the line. Select the principle of measurement point is as follows: ( 1) ZUI good choice of the pipe vertical section, if you choose to horizontal section, the section should be filled with fluid. ( 2) To ensure the enough straight section, measurement point should be not less than 10 times the diameter of straight pipe upstream and downstream should be not less than five times the diameter of straight pipe.

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