Cathode protection data acquisition and sensing device for buried pipeline

Abstract

The utility model discloses a buried pipeline cathode protection data acquisition sensing device, which comprises a test pile and a buried pipeline, the buried pipeline is arranged in a soil layer, the buried pipeline is connected with a grounding body through a grounding cable, one end of the test pile is positioned in the soil layer, the other end of the test pile is positioned outside the soil layer, and a cathode protection system is arranged in the test pile; the cathode protection system comprises a single-chip microcomputer, and a signal acquisition unit, an analog-to-digital conversion unit and a signal transmit-receive unit which are connected with the single-chip microcomputer. The cathode protection system comprises a single chip microcomputer, and a signal acquisition unit, an analog-to-digital conversion unit and a signal transceiving unit which are connected with the single chip microcomputer, and a reference electrode, a self-corrosion test piece and a sacrificial anode are added on the basis of an existing structure, so that the polarization probe realizes insulation between the test piece and the reference electrode and external interference current; therefore, the voltage drop in the power-off potential is reduced, and the measured signal is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline detection, in particular to a cathode protection data acquisition and sensing device for buried pipelines. Background Art

[0002] The main risks of buried steel gas pipelines during operation are external corrosion, third-party damage and geological disasters, of which external corrosion accounts for about 80% of pipeline failures. Controlling external corrosion eliminates about 80% of external risks of pipelines.

[0003] The known polarization probe is composed of a reference electrode, a test piece, a connecting wire, an insulating layer and a filler. The reference electrode and the test piece are placed in the probe. The probe itself is made of an insulating material and acts as an insulating layer, and the rest of the probe is occupied by the filler. When measuring the cathodic protection potential at a certain point of a buried pipeline, the test piece in the probe is connected to the test pile, and then the probe is buried in the soil. After the test piece is fully polarized, the power-off voltage between the test piece and the reference electrode is measured. This voltage can be considered as the cathodic protection potential of the pipeline at the test pile. However, the test pieces of many probes are directly exposed to the soil environment, so that the probe cannot completely achieve the insulation between the test piece and the reference electrode and the external interference current. The measured power-off potential contains a large voltage drop, which has a large difference with the cathodic protection potential, which is not conducive to the cathodic protection detection of buried pipelines. Utility Model Content

[0004] In view of the problems raised by the above-mentioned background technology, the purpose of the utility model is to provide a buried pipeline cathodic protection data acquisition and sensing device, which improves the efficiency of the buried pipeline cathodic protection detection work through the acquisition and sensing device, and solves the problem that there is a large difference in the existing buried pipeline cathodic protection potential measurement, which is not conducive to the buried pipeline cathodic protection detection work.

[0005] The utility model is realized by the following technical solutions:

[0006] Cathodic protection data acquisition and sensing device for buried pipelines, including

[0007] A test pile and a buried pipeline, wherein the buried pipeline is arranged in a soil layer, the buried pipeline is connected to a grounding body via a grounding cable, one end of the test pile is located in the soil layer, and the other end is located outside the soil layer, and a cathodic protection system is arranged in the test pile;

[0008] Wherein, the cathodic protection system includes a single chip microcomputer and a signal acquisition unit, an analog-to-digital conversion unit, and a signal transceiver unit connected to the single chip microcomputer;

[0009] The signal acquisition unit is connected to a polarization probe via a probe cable and to a reference electrode via a reference cable. The signal acquisition unit is also connected to a self-corrosion test piece and a sacrificial anode arranged in the soil layer.

[0010] In the above technical solution, when measuring the cathodic protection potential at a certain point of a buried pipeline, the test piece in the probe is connected to the test pile, and then the probe is buried in the soil. After the test piece is fully polarized, the power-off voltage between the test piece and the reference electrode is measured. However, since the test pieces of many probes are directly exposed to the soil environment, the probe cannot completely achieve the insulation between the test piece and the reference electrode and the external interference current. The measured power-off potential contains more voltage drops, which is greatly different from the cathodic protection potential. In view of this technical defect, the utility model provides the following Figure 4 The cathodic protection system shown includes a single-chip microcomputer and a signal acquisition unit, an analog-to-digital conversion unit, and a signal transceiver unit connected to the single-chip microcomputer. On the basis of the existing structure, a reference electrode, a self-corrosion test piece, and a sacrificial anode are added, so that the polarization probe can achieve insulation between the test piece and the reference electrode and the external interference current, thereby reducing the voltage drop in the power-off potential and making the measured signal more accurate.

[0011] In an optional embodiment, the signal acquisition unit is provided with a connecting copper sheet, the connecting copper sheet is connected to the sacrificial anode and the reference electrode, and the connecting copper sheet is connected to the buried pipeline through a pipeline cable.

[0012] In an optional embodiment, the analog-to-digital conversion unit includes a 3.5-bit analog-to-digital converter, and an analog signal input terminal of the 3.5-bit analog-to-digital converter is connected to a varistor and a discharge tube.

[0013] In an optional embodiment, the signal acquisition unit includes a natural potential input terminal, an instantaneous power-off potential input terminal, a pipeline potential input terminal and a reference point input terminal;

[0014] The natural potential input terminal, the instantaneous power-off potential input terminal, the pipeline potential input terminal, and the reference point input terminal input signals into the 3-bit half-analog-to-digital converter in sequence through relay K3, relay K2, relay K1, and relay K4 respectively.

[0015] In an optional embodiment, the breakpoints of the relay K2 and the breakpoints of the relay K4 are connected to a lightning protection circuit N7, and the breakpoints of the relay K3 and the breakpoints of the relay K4 are connected to a transient suppression diode.

[0016] In an optional embodiment, the 3.5-bit analog-to-digital converter uses a MAX1497 chip.

[0017] In an optional embodiment, the signal transceiver unit includes a GPRS / CDMA transceiver circuit, and the GPRS / CDMA transceiver circuit is connected to the signal output terminal of the single-chip microcomputer via a communication interface.

[0018] In an optional embodiment, an antenna receiver is disposed on the top of the test pile; the antenna receiver is connected to the cathodic protection system via an antenna cable.

[0019] In an optional embodiment, a display device connected to the self-corrosion test piece is provided on the test pile.

[0020] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0021] Based on the existing technology, a cathodic protection system is added. Through the cathodic protection system, real-time collection and monitoring of pipeline cathodic protection parameters can be achieved, the cathodic protection effect of pipelines can be better understood, and the management level and efficiency of the cathodic protection system can be improved. The evaluation of cathodic protection effectiveness can be better completed, thereby improving the pipeline integrity management level. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0023] Figure 1 A schematic diagram of the structure of a buried pipeline cathodic protection data acquisition and sensing device provided in Example 1 of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a buried pipeline cathodic protection data acquisition and sensing device provided in Example 1 of the present invention;

[0025] Figure 3 A schematic diagram of the principle of a signal acquisition unit provided in Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the principle of the cathodic protection system provided in Example 1 of the present invention.

[0027] Marks and corresponding parts names in the attached drawings:

[0028] 1. Test pile; 2. Buried pipeline; 3. Soil layer; 4. Cathodic protection system; 5. Antenna receiver; 6. Pipeline cable; 7. Antenna cable; 8. Grounding cable; 9. Grounding body; 10. Probe cable; 11. Reference electrode; 12. Polarization probe; 13. Self-corrosion test piece; 14. Display device; 15. Sacrificial anode; 16. Connecting copper sheet. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is described in detail in an optional embodiment in combination with the embodiments and drawings below. The schematic implementation mode of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0030] Example 1

[0031] Figure 1 The schematic diagram of the structure of the buried pipeline cathodic protection data acquisition and sensing device provided in Example 1 of the present invention is as follows: Figure 1 As shown, the buried pipeline cathodic protection data acquisition and sensing device includes:

[0032] A test pile 1 and a buried pipeline 2, wherein the buried pipeline 2 is arranged in a soil layer 3, the buried pipeline 2 is connected to a grounding body 9 via a grounding cable 8, one end of the test pile 1 is located in the soil layer 3, and the other end is located outside the soil layer 3, and a cathodic protection system 4 is arranged in the test pile 1;

[0033] The cathodic protection system 4 includes a single chip microcomputer and a signal acquisition unit, an analog-to-digital conversion unit, and a signal transceiver unit connected to the single chip microcomputer;

[0034] The signal acquisition unit is connected to a polarization probe 12 via a probe cable 10 and to a reference electrode 11 via a reference cable. The signal acquisition unit is also connected to a self-corrosion test piece 13 and a sacrificial anode 15 disposed in the soil layer 3 .

[0035] It should be noted that when measuring the cathodic protection potential at a certain point of the buried pipeline 2, the test piece in the probe is connected to the test pile 1, and then the probe is buried in the soil. After the test piece is fully polarized, the power-off voltage between the test piece and the reference electrode 11 is measured. However, since the test pieces of many probes are directly exposed to the soil environment, the probe cannot completely achieve the insulation between the test piece and the reference electrode 11 and the external interference current. The measured power-off potential contains more voltage drops, which is greatly different from the cathodic protection potential. In view of this technical defect, the utility model provides the following Figure 4 The cathodic protection system 4 shown, which includes a single-chip microcomputer and a signal acquisition unit, an analog-to-digital conversion unit, and a signal transceiver unit connected to the single-chip microcomputer, adds a reference electrode 11, a self-corrosion test piece 13, and a sacrificial anode 15 on the basis of the existing structure, so that the polarization probe 12 can achieve insulation between the test piece and the reference electrode 11 and the external interference current, thereby reducing the voltage drop in the power-off potential, making the measured signal more accurate.

[0036] In an optional embodiment, the signal acquisition unit is provided with a connecting copper sheet, the connecting copper sheet is connected to the sacrificial anode 15 and the reference electrode 11 , and the connecting copper sheet is connected to the buried pipeline 2 via a pipeline cable 6 .

[0037] In an optional embodiment, the analog-to-digital conversion unit includes a 3.5-bit analog-to-digital converter, and the 3.5-bit analog-to-digital converter is used to remove spatial interference and power frequency interference.

[0038] It should be noted that a 3.5-bit analog-to-digital converter is used in the analog-to-digital conversion unit. The high filtering attenuation characteristics of the 3.5-bit analog-to-digital converter can remove spatial interference (radiation interference) and power frequency interference (serial interference) in the cathodic protection system 4, thereby ensuring the correctness and accuracy of the data.

[0039] In an optional embodiment, the analog-to-digital conversion unit further includes a varistor and a discharge tube; the varistor and the discharge tube are both connected to the analog signal input terminal of the 3-bit and a half analog-to-digital converter.

[0040] It should be noted that the analog signal input terminals AIN+ and AIN- of the 3-bit half-ADC are connected with varistors and discharge tubes to ensure the safety of the circuit under high current and high voltage conditions such as lightning strikes.

[0041] In an optional embodiment, the signal acquisition unit includes a natural potential input terminal, an instantaneous power-off potential input terminal, a pipeline potential input terminal and a reference point input terminal;

[0042] The natural potential input terminal, the instantaneous power-off potential input terminal, the pipeline potential input terminal, and the reference point input terminal input signals into the 3-bit half-analog-to-digital converter in sequence through relay K3, relay K2, relay K1, and relay K4 respectively.

[0043] It should be noted that Figure 3 The schematic diagram of the principle of the signal acquisition unit provided in Embodiment 1 of the present invention is as follows: Figure 3As shown, the signal acquisition unit provided in this embodiment includes four relays, and the test signals input from the natural potential input terminal, the instantaneous power-off potential input terminal, the pipeline potential input terminal, and the reference point input terminal are respectively input into the single-chip microcomputer through the on-off control of a relay, and the on-off of the four relays is controlled by the single-chip microcomputer. The signal acquisition unit includes relays K1, relays K2, relays K3, and relays K4. The natural potential signal input from the natural potential input terminal ZRDW, the instantaneous power-off potential signal input from the instantaneous power-off potential input terminal SSDW, the pipeline potential signal input from the pipeline potential input terminal GD, and the reference point signal input from the reference point input terminal CB are respectively input into the 3-bit half-analog-to-digital converter in sequence through the on-off control of relays K3, relays K2, relays K1, and relays K4, and the on-off of relays K1 to K4 is controlled by the single-chip microcomputer D1.

[0044] In an optional embodiment, the breakpoints of the relay K2 and the breakpoints of the relay K4 are connected to a lightning protection circuit N7, and the breakpoints of the relay K3 and the breakpoints of the relay K4 are connected to a transient suppression diode.

[0045] It should be noted that the contacts of the relay are connected to the transient suppression diode TVS1 and the lightning protection circuit N7. The lightning protection circuit N7 is a grounding circuit used to introduce current into the underground in the case of large current and high voltage such as lightning strike, so as to ensure the safety of the circuit in the case of large current and high voltage such as lightning strike. The lightning protection circuit N7 can adopt a conventional lightning protection circuit, such as the lightning protection circuit in CN209488854U or the lightning protection circuit in CN206595710U.

[0046] In an optional embodiment, the 3.5-bit analog-to-digital converter uses a MAX1497 chip.

[0047] In an optional embodiment, the signal transceiver unit includes a GPRS / CDMA transceiver circuit, and the GPRS / CDMA transceiver circuit is connected to the signal output terminal of the single-chip microcomputer via a communication interface.

[0048] It should be noted that the signal transceiver unit includes a GPRS / CDMA transceiver circuit, wherein the GPRS / CDMA transceiver circuit is connected to a corresponding signal output terminal on the single chip microcomputer through a communication interface.

[0049] In an optional embodiment, an antenna receiver 5 is disposed on the top of the test pile 1 ; the antenna receiver 5 is connected to the cathodic protection system 4 via an antenna cable 7 .

[0050] In an optional embodiment, a display device 14 connected to the self-corrosion test piece 13 is provided on the test pile 1 .

[0051] It should be emphasized that the cathodic protection system 4 is added on the basis of the existing technology, through which the cathodic protection parameters of the pipeline can be collected and monitored in real time, the cathodic protection effect of the pipeline can be better understood, and the management level and efficiency of the cathodic protection system 4 can be improved. The evaluation of the effectiveness of cathodic protection can be better completed, thereby improving the management level of pipeline integrity.

[0052] To further reflect the technical effect of the utility model, the operation process of the cathode protection data acquisition and sensing device for buried pipeline 2 provided in this embodiment is as follows:

[0053] 1. Installation location positioning

[0054] During this installation, the original test pile 1 was used for wiring, and the wiring joints were treated with viscoelastic body and polypropylene outer protective tape for corrosion protection and insulation.

[0055] 2. Excavation of working pit

[0056] Since the test line of this project is removed from the original test pile 1, the original test pile 1 connection line is directly connected to the new test pile 1 terminal. It is installed vertically and poured with concrete. Before excavation, the actual direction and buried depth of the pipeline should be explored with detection instruments, and the concentration of combustible gas should be detected with a combustible gas detector; for pipelines with optical cables laid in the same trench, the position of the optical cables laid in the same trench should be confirmed first to ensure that the excavation process does not damage the optical / electrical cables: excavation can be carried out only after confirmation.

[0057] 3. Connection of pipeline cable 6 and buried pipeline 2 and anti-corrosion treatment

[0058] The connection between the pipeline cable 6 and the buried pipeline 2 is made by connecting the connecting wire inside the original test pile 1 on site, and electrical connectivity is ensured, and corresponding markings are made.

[0059] 4. Polarization probe 12 installation

[0060] The material is the same steel as the pipeline. The area of ​​the test piece is 6.5cm2. One is installed at each monitoring point, for a total of 3

[0061] Installation of polarization probe 12: The lead of polarization probe 12 is connected to the pipeline to ensure that the protection potential can reach polarization probe 12, so as to correctly reflect the protection status. In order to facilitate the observation of the corrosion status of the polarization test piece in the future, a wire is led to the test pile 1 for marking.

[0062] 5. Installation of self-corrosion test piece 13

[0063] The self-corrosion test piece 13 is a standard metal test piece connected to the test pipe for measuring corrosion. The material is the same steel as the pipe, and the area of ​​the test piece is required to be 6.5cm2; one is installed at each monitoring point, for a total of three.

[0064] Installation of the self-corrosion test piece 13; The lead wire of the self-corrosion test piece 13 cannot be connected to the pipeline. It is installed near the reference electrode 11 to truly reflect the corrosion situation without cathodic protection. In order to facilitate the observation of the corrosion condition of the self-corrosion test piece 13 in the future, a connecting cable is used to lead to the test pile 1 and marked

[0065] 6. Installation of long-acting reference electrode 11

[0066] In this embodiment, a total of 3 long-acting reference electrodes 11 are installed. The preparation work for installing the reference electrode 11 is as follows: before installation, take out the reference electrode 11 and put it into a saturated copper sulfate solution for more than 24 hours, and then add water to the filling material or the original soil to make it into a slurry. The reference electrode 11 is placed in the original soil (clean soil), and water is poured into the pit until the original soil reaches saturation, and then the soil is backfilled. Connect the reference cable to the test loop of the test pile 1, and use a portable reference for comparison.

[0067] 7. Installation of smart test pile 1

[0068] Three sets of intelligent test piles 1 are installed. Long-term reference electrodes 11, polarization test pieces and white corrosion test pieces are set under the pipeline test pile 1. Cathodic protection and interference monitoring terminals are installed in the test pile 1, and the start and end marks of various cables are clear and accurate.

[0069] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A data acquisition and sensing device for buried pipeline cathodic protection, characterized in that: include: A test pile (1) and a buried pipeline (2), wherein the buried pipeline (2) is arranged in a soil layer (3), the buried pipeline (2) is connected to a grounding body (9) via a grounding cable (8), one end of the test pile (1) is located in the soil layer (3), and the other end is located outside the soil layer (3), and a cathodic protection system (4) is arranged in the test pile (1); The cathodic protection system (4) comprises a single chip microcomputer and a signal acquisition unit, an analog-to-digital conversion unit, and a signal transceiver unit connected to the single chip microcomputer; The signal acquisition unit is connected to a polarization probe (12) via a probe cable (10) and to a reference electrode (11) via a reference cable. The signal acquisition unit is also connected to a self-corrosion test piece (13) and a sacrificial anode (15) arranged in a soil layer (3).

2. The buried pipeline cathodic protection data acquisition and sensing device according to claim 1 is characterized in that: The signal acquisition unit is provided with a connecting copper sheet, the connecting copper sheet is connected to the sacrificial anode (15) and the reference electrode (11), and the connecting copper sheet is connected to the buried pipeline (2) via a pipeline cable (6).

3. The buried pipeline cathodic protection data acquisition and sensing device according to claim 1 is characterized in that: The analog-to-digital conversion unit includes a 3.5-bit analog-to-digital converter, and the 3.5-bit analog-to-digital converter is used to remove spatial interference and power frequency interference.

4. The buried pipeline cathodic protection data acquisition and sensing device according to claim 3 is characterized in that: The analog-to-digital conversion unit also includes a varistor and a discharge tube; the varistor and the discharge tube are both connected to the analog signal input end of the 3-bit and a half analog-to-digital converter.

5. The buried pipeline cathodic protection data acquisition and sensing device according to claim 3 is characterized in that: The signal acquisition unit includes a natural potential input terminal, an instantaneous power-off potential input terminal, a pipeline potential input terminal and a reference point input terminal; The natural potential input terminal, the instantaneous power-off potential input terminal, the pipeline potential input terminal, and the reference point input terminal input signals into the 3-bit half-analog-to-digital converter in sequence through relay K3, relay K2, relay K1, and relay K4 respectively.

6. The buried pipeline cathodic protection data acquisition and sensing device according to claim 5, characterized in that: The breakpoints of the relay K2 and the relay K4 are connected to a lightning protection circuit N7 , and the breakpoints of the relay K3 and the relay K4 are connected to a transient suppression diode.

7. The buried pipeline cathodic protection data acquisition and sensing device according to claim 3 is characterized in that: The 3-bit and a half analog-to-digital converter adopts the MAX1497 chip.

8. The buried pipeline cathodic protection data acquisition and sensing device according to claim 1, characterized in that: The signal transceiver unit comprises a GPRS / CDMA transceiver circuit, and the GPRS / CDMA transceiver circuit is connected to the signal output terminal of the single chip microcomputer via a communication interface.

9. The buried pipeline cathodic protection data acquisition and sensing device according to claim 1, characterized in that: An antenna receiver (5) is arranged on the top of the test pile (1); the antenna receiver (5) is connected to the cathodic protection system (4) via an antenna cable (7).

10. The buried pipeline cathodic protection data acquisition and sensing device according to claim 1, characterized in that: The test pile (1) is provided with a display device (14) connected to the self-corrosion test piece (13).

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