Application of magnetic flowmeter in industrial water in steel mills

1 Working principle and status quo of magnetic flowmeter

1.1 working principle

From the point of view of the application of magnetic flowmeter, the principle it follows is Faraday’s law of electromagnetic induction. The measuring tube is a short non-magnetic alloy tube, which is lined with insulating material. The electrode is fixed after passing through the tube wall to ensure the electrode tip and lining. The surface can be kept flush. When the pulse is excited, the working magnetic field will be generated. At this time, the fluid has a certain conductivity and passes through the measuring tube, so that the electromotive force can be obtained. After the flow signal enters the converter, it will be amplified and processed, so that the price flow and the total amount can be realistically presented, and the pulse signal can be output, and the current signal can be simulated.

2 Analysis of magnetic flowmeters in industrial water measurement in steel plants

In steel mills, industrial water measurement cannot be ignored. In order to ensure the smooth completion of measurement work, magnetic flowmeters must be fully used. Analysis of the magnetic flowmeter shows that it follows the principle of electromagnetic induction, and the conductive liquid is the measurement object. The magnetic flowmeter is installed on the side of the pipeline. When the industrial water is in a flowing state, it will inevitably cut the magnetic lines of force, so that an induced electric potential will appear. At this time, the magnetic flowmeter can analyze the industrial water in the pipeline. The actual flow of industrial water can be understood by calculating the flow formula.

3 Operation of magnetic flowmeter

In order to make full use of the magnetic flowmeter when the steel plant starts industrial water measurement, the measured liquid should have conductivity, and its conductivity must exceed the threshold, so that the measurement can be more accurate, and the error will not exceed the established value. Scope. Generally speaking, the conductivity of industrial water in steel plants exceeds 10-4s/cm, which can be measured by magnetic flowmeters. When the actual flow rate of the industrial water in the steel plant is between 4 and 5 m/s, the full-scale measurement method can be selected. In the entire measurement process, the magnetic flowmeter does not have a reality in terms of flow. Of course, it is necessary to repeat from the status quo of industrial water in steel plants and effectively control the flow rate to ensure that it does not exceed 6m/s. If the conductivity of the industrial water changes, if it is close to the minimum, the flow rate must be effectively controlled, that is, to ensure that the flow rate of the industrial water is as slow as possible, so that the metering work can be carried out smoothly. The flow noise is not Larger interference will occur, and the reliability of the magnetic flowmeter will also be greatly improved. In the process of industrial water measurement in steel plants, the application environment of magnetic flowmeters is more complicated. If you want to ensure more accurate measurement, cable control cannot be ignored. Through it, magnetic flowmeters can not face excessive operating pressure. . As we all know, the influence of cable length is relatively large. Therefore, it is necessary to ensure that the cable length design can be effectively implemented. In particular, the following points must be effectively implemented:-The cable used for the converter connection must be controlled in length, and Choose the straight line connection method, which can ensure that the quality of the magnetic flowmeter transmission signal is improved; second, if the cable length exceeds the standard, the probability of load is very high. If you want to effectively eliminate this situation, you must choose a shielded cable In this way, it can be ensured that the voltage will not rise significantly, and the full use of shielding measures can make the electromagnetic flowmeter potential control effect more ideal, and the water metering of the steel plant I can smoothly start; the third is to start the industrial water metering of the steel plant. The signal cable can be adjusted appropriately, and the length control is more flexible.

4 Maintenance measures for magnetic flowmeters in industrial water measurement in steel plants

From the current status of industrial water measurement in steel plants, magnetic flowmeters must be fully applied, and maintenance work must be scientifically arranged based on actual operating conditions.

4.1 Sensor maintenance

4.2 Adhesion layer on the inner wall of the sensor

4.3 Prevent lightning damage

4.4 Changes in environmental conditions

4.5 Zero point change of the system