Device for detecting flow direction of fluid in petrochemical non-magnetic metal pipeline

Abstract

The utility model discloses a petrochemical engineering non-magnetic metal pipeline fluid flow direction detection device. The detection device comprises a non-magnetic metal pipeline; each pair of electrodes is mounted on the non-magnetic metal pipeline and is configured to detect an induced electromotive force induced by a fluid flowing through the non-magnetic metal pipeline, so that the detection device judges the flowing direction of the fluid in the non-magnetic metal pipeline based on the positive and negative of the induced electromotive force; and the magnetic field generating unit is configured to form a magnetic field perpendicular to the axis of the non-magnetic metal pipeline in the fluid.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical fluid flow direction detection, in particular to a petrochemical fluid flow direction detection device based on the Faraday electromagnetic induction principle. Background Art

[0002] In the petrochemical production process, fluid flow direction monitoring is crucial to ensure the safety and efficiency of the production process, especially in operations such as accident handling and fault diagnosis. There is currently no effective means to accurately detect. Therefore, the field is in urgent need of providing an accurate, reliable and real-time fluid flow direction detection device, which is of great significance to improving the safety and efficiency of petrochemical production. Utility Model Content

[0003] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry in view of the deficiencies in the prior art, which can detect the flow velocity and flow direction of the fluid in the non-magnetic metal pipeline.

[0004] In order to solve the above technical problems, the utility model discloses a device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry, the detection device comprising:

[0005] Non-magnetic metal pipes;

[0006] More than one pair of electrodes, each pair of electrodes is mounted on the non-magnetic metal pipe and is configured to detect an induced electromotive force induced by the fluid flowing through the non-magnetic metal pipe, so that the detection device can determine the flow direction of the fluid in the non-magnetic metal pipe based on the positive and negative signs of the induced electromotive force;

[0007] and a magnetic field generating unit configured to form a magnetic field perpendicular to the axis of the non-magnetic conductive metal pipe in the fluid.

[0008] Preferably, the electrode is a needle-type electrode, which is connected to the outer wall of the non-magnetic metal pipe and is electrically connected to the non-magnetic metal pipe.

[0009] Specifically, the magnetic field generating unit includes an iron core and an electromagnetic coil, and the electromagnetic coil is wound on the iron core.

[0010] Specifically, the magnetic field generating unit includes an adjustable current power supply, the electromagnetic coil is connected to the adjustable current power supply, and the adjustable current power supply is configured to adjustably provide supply current to the electromagnetic coil.

[0011] Specifically, the current adjustable power supply comprises:

[0012] A DC voltage source, wherein two ends of the DC voltage source are respectively electrically connected to two ends of the electromagnetic coil to form a current loop for circulating the supply current;

[0013] and an adjustable resistor, which is disposed in the current loop and is configured to be able to adjust the supply current.

[0014] Specifically, the current adjustable power supply includes a switch element, which is disposed in the current loop and is configured to control the on and off of the current.

[0015] Furthermore, the detection device also includes a micro-pressure amplifier connected to the electrode, and the micro-pressure amplifier is configured to amplify the induced electromotive force induced by the fluid flowing through the non-magnetic metal pipe, and convert the amplified induced electromotive force into a readable electrical signal for output for accurate measurement.

[0016] Furthermore, the detection device also includes a data processing unit, which is used to receive the electrical signal from the micro-pressure amplifier and obtain the flow speed and flow direction of the fluid based on the electrical signal.

[0017] Preferably, the magnetic field is a uniform magnetic field.

[0018] Preferably, the non-magnetic metal pipe is a steel pipe.

[0019] Specifically, the micro-voltage amplifier includes a first terminal, a second terminal, a third terminal, a fourth terminal, a current limiting resistor, an amplifying resistor, a transistor, a ground, a voltmeter, and a DC power supply. The first terminal is used to connect to one of each pair of electrodes. The second terminal is used to connect to the other of each pair of electrodes. The transistor includes a control terminal, a first terminal, and a second terminal. The first end of the transistor is connected to one end of the amplifying resistor in parallel with the third terminal, and the second end of the transistor is connected to the fourth terminal. One end of the current limiting resistor is connected to the first terminal, and the other end is connected to the control end of the transistor. The other end of the amplifying resistor is connected to the positive electrode of the DC power supply. One end of the voltmeter is connected to the third terminal, and the other end is connected to the fourth terminal. The second end of the transistor, the second terminal, the fourth terminal, and the negative electrode of the DC power supply are connected to the ground in parallel.

[0020] Beneficial effects:

[0021] (1) High-precision measurement: The utility model uses the Faraday electromagnetic induction principle to accurately measure the weak induced electromotive force generated when the fluid cuts the magnetic lines of force in the magnetic field, and judges the flow direction of the fluid in the non-magnetic metal pipe based on the positive and negative values ​​of the induced electromotive force. Furthermore, a micro-pressure amplifier is used to amplify the weak induced electromotive force, and a data processing unit is used to receive the electrical signal from the micro-pressure amplifier, and the flow velocity and flow direction of the fluid are obtained based on the electrical signal. The calculation is accurate and reliable, and is suitable for occasions with high requirements for fluid flow direction monitoring.

[0022] (2) Non-intrusive monitoring: Since the device uses a non-contact measurement method, there is no need to insert any sensor or probe into the fluid, thus avoiding interference with the fluid flow and ensuring the accuracy of the measurement and the purity of the fluid. This is especially important for monitoring high-temperature, high-pressure, corrosive or viscous fluids.

[0023] (3) Strong real-time performance: The device can monitor the flow direction and flow rate of the fluid in real time and transmit the data to the data processing unit for processing and display. This enables operators to understand the flow status of the fluid in a timely manner, detect abnormal conditions in a timely manner and take corresponding measures to ensure the safety and stability of the production process.

[0024] (4) Wide applicability: The detection device based on Faraday electromagnetic induction principle is suitable for monitoring the flow direction of various conductive liquids. Whether the fluid is liquid metal, salt water, acid-base solution or other conductive liquid, as long as its conductivity is high enough, it can generate induced electromotive force and be measured. Therefore, the device has broad application prospects in the fields of petrochemical, metallurgy, and electric power.

[0025] (5) Easy maintenance: Since the device has a simple structure and no moving parts or wearing parts, it is relatively easy to maintain. At the same time, the use of non-contact measurement reduces direct contact with the fluid, reducing the safety risks and maintenance costs of maintenance personnel.

[0026] (6) Strong scalability: The detection device provided by the utility model can be integrated with other automation systems and monitoring systems to achieve remote data transmission and monitoring. This enables the device to be easily expanded to a wider range of industrial automation and monitoring systems, improving the automation level and intelligence of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, and the above and / or other advantages of the present invention will become more clear.

[0028] Figure 1 The present invention is a schematic diagram of the overall structure of a device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry, provided as an embodiment of the present invention.

[0029] Figure 2 This is a circuit diagram of a micro-voltage amplifier used in one embodiment of the utility model.

[0030] The description of the accompanying drawings is:

[0031] 1. Iron core; 2. Conductor; 3. Electromagnetic coil; 4. DC voltage source; 5. Switching element; 6. Adjustable resistor; 7-1. First needle electrode; 7-2. Second needle electrode; 8. Micro-voltage amplifier; 9. Non-magnetic metal pipe; 10-1. First terminal; 10-2. Second terminal; 10-3. Third terminal; 10-4. Fourth terminal; 11-1. Current limiting resistor; 11-2. Amplifying resistor; 12. Transistor; 14. Voltmeter; 15. DC power supply. DETAILED DESCRIPTION

[0032] The utility model provides a device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry. The device is used for detecting the flow direction of fluid in a non-magnetic metal pipeline 9 made of steel of a petrochemical industry.

[0033] Figure 1 A schematic diagram of the overall structure of a detection device provided in an embodiment of the utility model is provided.

[0034] See also Figure 1 It can be seen that the detection device includes a non-magnetic metal pipe 9, one or more pairs of electrodes, and a magnetic field generating unit. Each pair of electrodes is installed on the non-magnetic metal pipe 9 and is configured to detect the induced electromotive force induced by the fluid flowing through the non-magnetic metal pipe 9, so that the detection device can determine the flow direction of the fluid in the non-magnetic metal pipe 9 based on the positive and negative of the induced electromotive force. The magnetic field generating unit is configured to form a magnetic field perpendicular to the axis of the non-magnetic metal pipe 9 in the fluid.

[0035] Preferably, the magnetic field is a uniform magnetic field.

[0036] Optionally, the non-magnetic metal pipe 9 is a steel pipe.

[0037] Optionally, the electrode is a needle electrode, which is connected to the outer wall of the non-magnetic metal pipe 9 and is electrically connected to the non-magnetic metal pipe 9. If the non-magnetic metal pipe 9 has anti-corrosion measures, its anti-corrosion paint may need to be destroyed. More specifically, if Figure 1 As shown, the detection device includes a pair of needle electrodes, the pair of needle electrodes includes a first needle electrode 7-1 and a second needle electrode 7-2, and the first needle electrode 7-1 and the second needle electrode 7-2 are respectively installed on both sides of the steel pipe 9. Preferably, the electrodes are made of materials with high corrosion resistance and good conductivity to ensure long-term stable performance.

[0038] Specifically, Figure 1 As shown, the magnetic field generating unit includes an iron core 1 and an electromagnetic coil 3, and the electromagnetic coil 3 is wound on the iron core 1. Specifically, the magnetic field generating unit includes an adjustable current power supply, and the electromagnetic coil 3 is connected to the adjustable current power supply, and the adjustable current power supply is configured to adjustably provide a supply current to the electromagnetic coil 3. Specifically, as Figure 1 As shown, the current adjustable power supply includes a DC voltage source 4 and an adjustable resistor 6. The two ends of the DC voltage source 4 are electrically connected to the two ends of the electromagnetic coil 3 to form a current loop for circulating the supply current. The adjustable resistor 6 is arranged in the current loop and is configured to be able to adjust the supply current. More specifically, as Figure 1 As shown, the current adjustable power supply further includes a switch element 5, which is disposed in the current loop and is configured to control the on and off of the current. Figure 1 As shown, the DC voltage source 4, the electromagnetic coil 3, the adjustable resistor 6 and the switch element 5 are sequentially arranged in the current loop.

[0039] Since the induced electromotive force is usually very weak, direct measurement may be affected by noise and interference. Therefore, further, the detection device also includes a micro-pressure amplifier 8, which is configured to amplify the induced electromotive force induced by the fluid flowing through the non-magnetic metal pipe 9, and convert the amplified induced electromotive force into a readable electrical signal for output, so as to accurately measure.

[0040] In this embodiment, the micro-voltage amplifier 8 is used to amplify a tiny voltage and determine the flow direction of the fluid in the non-magnetic metal pipe 9 according to the direction of the voltage or current.

[0041] For details, see Figure 2 , the micro-voltage amplifier 8 includes a first terminal 10-1, a second terminal 10-2, a third terminal 10-3, a fourth terminal 10-4, a current limiting resistor 11-1, an amplifying resistor 11-2, a transistor 12, a voltmeter 14 and a DC power supply 15. The first terminal 10-1 is used to connect to one of each pair of electrodes. The second terminal 10-2 is used to connect to the other of each pair of electrodes. The transistor 12 includes a control terminal, a first terminal and a second terminal. The first end of the transistor 12 is connected to one end of the amplifying resistor 11-2 in parallel with the third terminal 10-3, and the second end of the transistor 12 is connected to the fourth terminal 10-4. One end of the current limiting resistor 11-1 is connected to the first terminal 10-1, and the other end is connected to the control end of the transistor 12. The other end of the amplifying resistor 11-2 is connected to the positive pole of the DC power supply 15. One end of the voltmeter 14 is connected to the third terminal 10-3, and the other end is connected to the fourth terminal 10-4. The second end of the transistor 12, the second terminal 10-2, the fourth terminal 10-4 and the negative electrode of the DC power supply 15 are connected to the ground in parallel. Figure 1 As shown, the first terminal 10-1 is connected to one of the pairs of electrodes via a wire 2. The second terminal 10-2 is connected to the other of the pairs of electrodes via a wire 2. In a specific embodiment, as shown in FIG. Figure 1 As shown, the positive terminal of the voltmeter 14 is connected to the third terminal 10 - 3 , and the negative terminal of the voltmeter 14 is connected to the fourth terminal 10 - 4 .

[0042] The flow direction detection judgment logic of the detection device of the utility model is as follows:

[0043] According to Faraday's law of electromagnetic induction, the induced electromotive force (ε) is proportional to the rate of change of magnetic flux:

[0044] E=B·L·v·sin(θ)

[0045] in:

[0046] E stands for induced electromotive force, and its unit is volt (V).

[0047] B represents the magnetic induction intensity, and its unit is Tesla (T).

[0048] L represents the effective length of the conductor in the magnetic field, measured in meters (m).

[0049] v represents the speed of the conductor relative to the magnetic field, measured in meters per second (m / s).

[0050] θ is the angle between the conductor movement direction and the magnetic field direction, and its unit is degree (°) or radian (rad). In this case, the angle is 90°, and sin(θ)=1.

[0051] For an electromagnet, if the magnetic field is assumed to be uniform and the magnetic circuit is simple (no complicated bends or branches), then Ampere's circuit law can be simplified to:

[0052]

[0053] in:

[0054] N is the number of coil turns;

[0055] I is the current through the coil;

[0056] L g is the air gap length;

[0057] L c is the effective length of the core;

[0058] μ r is the relative permeability of the core material.

[0059] μ 0is the magnetic permeability in vacuum, which is 4π×10 -7 T·m / A;

[0060] Since the induced electromotive force is usually very small, it needs to be amplified by a micro-voltage amplifier 8. The amplified voltage signal can be expressed as:

[0061] V out =G·E

[0062] in:

[0063] V out Represents the amplified output voltage in volts (V).

[0064] G represents the gain of the micro-voltage amplifier 8, which is a unitless proportional coefficient and represents the amplification factor between the output signal and the input signal.

[0065] E represents the original signal input to the micro-voltage amplifier 8, that is, the induced electromotive force, and the unit is also volt (V).

[0066] The calculation of the final flow rate is based on the proportional relationship between the induced electromotive force and the flow rate. Since the induced electromotive force has been converted into an output voltage by the micro-voltage amplifier 8, the flow rate calculation formula is:

[0067]

[0068] If the calculated result is >0, the fluid flows along the needle electrode from positive to negative direction; if the calculated result is <0, the fluid flows along the needle electrode from negative to positive direction.

[0069] If the nominal diameter of the non-magnetic metal pipe 9 is very small, multiple groups of magnetic field generating units can be provided to enhance the magnetic field. The fluid in the non-magnetic metal pipe 9 must be a conductive fluid.

[0070] In a specific embodiment, the micro-voltage amplifier 8 adopts a micro-current measurement amplifier circuit disclosed in the Chinese utility model patent with publication number CN 203849632 U.

[0071] Furthermore, the detection device also includes a data processing unit, which is used to receive the electrical signal from the micro-pressure amplifier, and calculate the flow rate and flow direction of the fluid based on the electrical signal according to a pre-calibrated empirical formula or algorithm, and display the result in real time on the monitoring interface or transmit it to the remote monitoring system.

[0072] The utility model provides a concept and method for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry. There are many methods and ways to implement the technical solution. The above is only the preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications should also be regarded as the protection scope of the utility model. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry, characterized in that: include: More than one pair of electrodes, each pair of electrodes being mounted on a non-magnetic metal pipe (9) and configured to detect an induced electromotive force induced by a fluid flowing through the non-magnetic metal pipe (9), so that the detection device can determine the flow direction of the fluid in the non-magnetic metal pipe (9) based on the positive or negative value of the induced electromotive force; And a magnetic field generating unit can be configured to form a magnetic field perpendicular to the axis of the non-magnetic conductive metal pipe (9) in the fluid.

2. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 1, characterized in that: The electrode is connected to the outer wall of the non-magnetic metal pipe (9) and is electrically connected to the non-magnetic metal pipe (9).

3. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 1 or 2, characterized in that: The magnetic field generating unit comprises an iron core (1) and an electromagnetic coil (3), wherein the electromagnetic coil (3) is wound on the iron core (1).

4. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 3, characterized in that: The magnetic field generating unit comprises an adjustable current power supply, the electromagnetic coil (3) is connected to the adjustable current power supply, and the adjustable current power supply is configured to adjustably provide a supply current to the electromagnetic coil (3).

5. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 4, characterized in that: The current adjustable power supply comprises: A direct current voltage source (4), wherein two ends of the direct current voltage source (4) are respectively electrically connected to two ends of the electromagnetic coil (3) to form a current loop for circulating the supply current; and an adjustable resistor (6) disposed in the current loop and configured to be able to adjust the supply current.

6. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 5, characterized in that: The current adjustable power supply comprises a switch element (5), wherein the switch element (5) is arranged in the current loop and is configured to control the on and off of the current.

7. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 4, characterized in that: It comprises a micro-pressure amplifier (8) connected to the electrodes, and the micro-pressure amplifier (8) is configured to amplify the induced electromotive force induced by the fluid flowing through the non-magnetic metal pipe (9), and convert the amplified induced electromotive force into a readable electrical signal for output so as to accurately measure.

8. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 7, characterized in that: It comprises a data processing unit, which is used to receive the electrical signal from the micro-pressure amplifier and obtain the flow speed and flow direction of the fluid based on the electrical signal.

9. A device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 8, characterized in that: The non-magnetic metal pipe (9) is a steel pipe.

10. The device for detecting the flow direction of fluid in a non-magnetic metal pipeline of a petrochemical industry according to claim 7, characterized in that: The micro-voltage amplifier (8) comprises a first wiring terminal (10-1), a second wiring terminal (10-2), a third wiring terminal (10-3), a fourth wiring terminal (10-4), a current limiting resistor (11-1), an amplifying resistor (11-2), a transistor (12), a ground (13), a voltmeter (14) and a DC power supply (15); the first wiring terminal (10-1) is used to connect to one of each pair of electrodes; the second wiring terminal (10-2) is used to connect to the other of each pair of electrodes; the transistor (12) comprises a control terminal, a first terminal and a second terminal; the first terminal of the transistor (12) is connected in parallel with the third wiring terminal (10-3) to the amplifying resistor (11-2); One end of the resistor (11-2) and the second end of the transistor (12) are connected to the fourth wiring terminal (10-4); one end of the current limiting resistor (11-1) is connected to the first wiring terminal (10-1), and the other end is connected to the control end of the transistor (12); the other end of the amplifying resistor (11-2) is connected to the positive electrode of the DC power supply (15); one end of the voltmeter (14) is connected to the third wiring terminal (10-3), and the other end is connected to the fourth wiring terminal (10-4); the second end of the transistor (12), the second wiring terminal (10-2), the fourth wiring terminal (10-4) and the negative electrode of the DC power supply (15) are connected to the ground in parallel.

Images