First, the application of electromagnetic flow meter:
For example, a crude oil trade measurement and transfer station is required to satisfy the transmission of 1500×104t/a, and the flow rate is 2100m3/h. If 3 and 1 are used, the single flow must reach at least 700m3/h. According to the calculation, it is more suitable to select the DN250 electromagnetic flow meter with the flow range of (200~2000) m3/h; 3 with 1 standby, the flow rate of each channel is (900~1400) m3/h, and the flow rate of each channel is 1400m3/ h can be used to meet the requirements of the volume. The electromagnetic flowmeter is a speed type flow meter. The flow state has a great influence on its measurement accuracy. It should be equipped with a straight pipe section and a rectifier that are long enough to ensure a good speed distribution at the inlet end of the electromagnetic flow meter to improve measurement accuracy. grade. The process flow is shown in Figure 1.
Figure 1 Flow chart of the measurement of electromagnetic flowmeter of a crude oil trade measurement and transfer station
Figure 2 1# electromagnetic flowmeter flowmeter coefficient trend chart
Figure 3 2# electromagnetic flowmeter flowmeter coefficient trend chart
Figure 4 Flow chart coefficient trend chart of 3# electromagnetic flowmeter
Figure 5 Flow chart coefficient trend chart of 4# electromagnetic flowmeter
Electromagnetic flow meter is used for crude oil trade transfer measurement. Generally, the system has better matching. It is equipped with auxiliary instruments such as temperature transmitter and pressure transmitter. The metering system can realize automatic measurement, compensation and oil of flow, pressure and temperature. Quantity calculation. The correlation coefficient can be corrected in real time through the flow computer to ensure the accuracy of the measurement system. Continuous sampling of the oil sample is achieved by an automatic sampling device.
There is an online analysis system that detects the density, viscosity and water content of crude oil at any time. The calibration of the electromagnetic flowmeter adopts the volume tube on-line verification, and the volumetric tube is used to verify the flowmeter coefficient of the four flowmeters (the flowmeter coefficient is a representation of the basic error of the flowmeter, the trade transfer amount = the flowmeter reading × flowmeter Coefficient) The trend graph is shown in Figures 2 to 5.
It can be seen from Fig. 2 to Fig. 5 that the four electromagnetic flowmeters have strong stability and reliability, and have good repeatability and accuracy, and meet the requirements of crude oil trade handover measurement.
Second, the conclusion:
Due to the advantages and successful application of the electromagnetic flow meter itself, the application of the electromagnetic flow meter in the domestic crude oil trade transfer measurement will become more and more widespread, and it will become the preferred type of flowmeter.