Sacrificial anode boost power supply cathodic protection system

Abstract

A kind of pipeline's sacrificial anode boost power cathodic protection system, in order to solve the problem that pipeline protection distance is shorter when pipeline without external power supply is often used in sacrificial anode protection, cannot realize synchronous power-off test and cathodic protection and corrosion parameter remote monitoring, detection and other automation management, the technical scheme adopted is: using DC / DC boost module to increase the voltage between sacrificial anode and grounding body as power supply, to improve the protection potential of pipeline and realize each automation management function.Pipeline protected by sacrificial anode boost power cathodic protection system can be adjusted to the upper limit of protection potential to increase the length of cathodic protection of pipeline under the premise of meeting cathodic protection criteria, and realize the automation management functions such as synchronous on-off test, cathodic protection and corrosion parameter remote monitoring, detection of pipeline without external power supply cathodic protection with low cost. Figure 1 is the abstract drawing of the present application.

Description

Technical Field

[0001]

[0001] The present invention relates to a cathodic protection system for pipelines, and more particularly to a sacrificial anode boost cathodic protection system that uses the increased voltage between the sacrificial anode and the grounding electrode as a power source. Background Technology

[0002]

[0002] Currently, in cathodic protection systems for oil and gas pipelines, sacrificial anode protection systems are often used in areas where the pipeline diameter is small, the length is short, and there is no power source. However, when using zinc anodes, aluminum anodes, or soil with high resistivity, the protection potential of the pipeline is often low and the protection distance is short. At the same time, the low voltage is difficult to use as a power source, making it difficult to achieve self-testing of cathodic protection parameters, data transmission, and synchronous power-off testing of protection potential. This limits the application scope of sacrificial anode protection and the level of automatic and intelligent management. Summary of the Invention

[0003]

[0003] In order to overcome the shortcomings of the existing pipeline sacrificial anode protection potential being generally low, and the lack of an external power supply making it difficult to achieve automated management functions such as synchronous power-off testing, cathodic protection, and remote monitoring and detection of corrosion parameters, this invention provides a method that uses the voltage between the sacrificial anode and the grounding body as a power source. This method can achieve a longer protection length for the pipeline using the sacrificial anode, and can also provide power for facilities such as synchronous power-on and power-off testing, cathodic protection, and remote monitoring and detection of corrosion parameters, thereby achieving the goal of automated pipeline management at a lower cost.

[0004]

[0004] The present invention employs three technical solutions to solve its technical problem. Each solution includes a grounding electrode buried in the soil, a sacrificial anode, a pipe, and an auxiliary anode, a housing of an equipment box or test pile installed on the ground, and a DC / DC boost module installed inside the housing. In the input circuit of the DC / DC boost module in each solution, the grounding electrode, the positive terminal of the DC / DC boost module input, the negative terminal of the DC / DC boost module input, and the sacrificial anode are connected in sequence to form the input circuit of the DC / DC boost module. In each solution, the electrode potential of the sacrificial anode must be negative to the protection potential of the pipe and the potential of the grounding electrode.

[0005] The output circuit in the split anode type solution is as follows: the protected pipe, the negative terminal of the DC / DC boost module output, the positive terminal of the DC / DC boost module output, and the auxiliary anode are connected in sequence to the power output terminal of the DC / DC boost module to form the forced current cathodic protection system output circuit of the DC / DC boost module.

[0005]

[0006] In the common sacrificial anode scheme, the circuit other than the input circuit of the DC / DC boost module is as follows: When a voltage regulator module and a manual switch are added and installed in the housing, the output terminal of the DC / DC boost module, the voltage regulator module, and the manual switch are connected in series in sequence at the output terminal of the DC / DC boost module; the pipe is connected in sequence and then connected to the negative terminal of the voltage regulator module through the manual switch; then the positive terminal of the output terminal of the voltage regulator module is connected in sequence and then connected to the sacrificial anode through the manual switch, thus forming the output circuit of the DC / DC boost module. The output circuit is a common sacrificial anode protection system after boosting; the sacrificial anode is the common anode of the input and output terminals of the DC / DC boost module.

[0006]

[0007] In the dual sacrificial anode scheme, the circuit other than the input circuit of the DC / DC boost module is as follows: In the sacrificial anode boost power supply cathodic protection system, two independent sacrificial anodes are buried in the soil, one for sacrificial anode protection of the pipeline and the other for power supply of the power modules and components in the system; a sensor module is added buried in the soil, and the DC / DC boost module, synchronous power-off switch, energy storage module and data acquisition module are installed in the equipment box or test pile housing on the ground; the output circuit of the DC / DC boost module is connected in parallel to the power input terminals of the synchronous power-off switch, energy storage module and data acquisition module and supplies power to the three; the pipeline, synchronous power-off switch and sacrificial anode for protection are connected in sequence to form a switchable sacrificial anode protection circuit; the zero-position cathode terminal of the data acquisition module is connected to the pipeline, the reference terminal is connected to the sensor module, and the data output terminal is connected to the data line and led out to the outside of the housing to connect with the communication facilities outside the system for data transmission; the control signal terminal of the data acquisition module is connected to the synchronous power-off switch to provide synchronous power-off test control signal.

[0007]

[0008] In the input circuit of the sacrificial anode boost power supply cathodic protection system, the low-voltage DC power generated by the potential difference between the buried and electrically connected grounding body and the sacrificial anode due to the different electrode potentials of different materials is boosted to a higher voltage DC power supply by the DC / DC boost module.

[0008]

[0009] When the split anode scheme is adopted, the boost DC power supply outputs cathodic protection current through the auxiliary anode to implement cathodic protection for the pipeline. At the same time, the higher voltage DC power supply can provide power for electronic and electrical components and modules such as automatic acquisition of cathodic protection parameters, communication transmission, and control.

[0010] When the common sacrificial anode scheme is adopted, the sacrificial anode serves as both the sacrificial anode at the input end and the grounding body to form an input circuit, and as the auxiliary anode at the output end to provide cathodic protection current to the pipeline. The voltage regulating module in the circuit is used to provide the pipeline with a protection potential that meets the cathodic protection criteria.

[0009]

[0011] When the double sacrificial anode scheme is adopted, the data acquisition instrument receives the protection potential provided by the sensor module and the pipeline. The synchronous power-off switch is controlled by the on / off signal transmitted by the data acquisition module to control the on / off test.

[0010]

[0012] In various schemes of the sacrificial anode boost power supply cathodic protection system, in order to ensure that the protection potential of the pipeline is positive to the sacrificial anode, the voltage is adjusted by a passive potentiostat or the voltage adjustment circuit in the voltage adjustment module; in order to avoid or reduce the interference of the protected pipeline that is negative to the grounding electrode, the integrity of the pipeline anti-corrosion insulation layer should be ensured during system installation, and the distance between the grounding electrode and the pipeline should be kept away from the position where the interference is acceptable;

[0013] The passive potentiostat in the sacrificial anode boost power supply cathodic protection system, except that it does not have a power supply, also has conventional functions such as output cathode potential adjustment, synchronous switching and data communication transmission.

[0011]

[0014] In the sacrificial anode boost power supply cathodic protection system, the boosted sacrificial anode cathodic protection power supply can not only ensure the protection of pipelines over a long distance, but also enable the sacrificial anode protection system to realize automated and intelligent management functions such as synchronous power-off testing and automatic acquisition, transmission and control of cathodic protection parameters.

[0012]

[0015] The beneficial effect of the present invention is that, in the absence of an external power supply, the sacrificial anode boost power supply anode protection system can not only ensure the cathodic protection of long-distance pipelines, but also provide a cheap power supply to achieve the level of automated management of the cathodic protection system. Attached Figure Description

[0013]

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014]

[0017] Figure 1 This is a circuit diagram of the sacrificial anode boost power supply cathode protection system of the present invention with a separate anode scheme.

[0015]

[0018] Figure 2 This is a circuit diagram of a voltage-regulating on / off circuit with a split-anode scheme.

[0016]

[0019] Figure 3 This is a circuit diagram of a constant potential type circuit with a split anode scheme.

[0017]

[0020] Figure 4 This is a circuit diagram of the sacrificial anode boost power supply cathode protection system of the common sacrificial anode scheme of the present invention.

[0018]

[0021] Figure 5This is the circuit wiring diagram for the in-situ test type of the common sacrificial anode scheme.

[0019]

[0022] Figure 6 This is a circuit diagram of a constant potential type common sacrificial anode scheme.

[0020]

[0023] Figure 7 This is a circuit diagram of the double sacrificial anode scheme of the present invention.

[0021]

[0024] In the figure, 1 is the grounding body, 2 is the sacrificial anode, 3 is the DC / DC boost module, 4 is the housing, 5 is the pipe, 6 is the auxiliary anode, 7 is the voltage regulating module, 8 is the manual switch, 9 is the passive potentiostat, 10 is the sensor module, 11 is the energy storage module, 12 is the data line, 13 is the synchronous power-off switch, 14 is the data acquisition module, and 15 is the terminal block. Detailed Implementation

[0022]

[0025] In Figure 1 In the circuit diagram of the sacrificial anode boost power supply cathodic protection system of the anode scheme: the sacrificial anode (2), pipe (5), grounding body (1) and auxiliary anode (6) are buried in the soil, and the housing (4) of the equipment box or test pile installed on the ground and the DC / DC boost module (3) installed in the housing (4) are connected in sequence to the grounding body (1), the positive input terminal of the DC / DC boost module (3), the negative input terminal of the DC / DC boost module (3), and the sacrificial anode (2); the pipe (5), the negative output terminal of the DC / DC boost module (3), the positive output terminal of the DC / DC boost module (3), and the auxiliary anode (6) are connected in sequence.

[0023]

[0026] In Figure 2 In the circuit diagram of the voltage regulation switching type of the anode scheme: the sacrificial anode (2), the pipe (5), the grounding body (1) and the auxiliary anode (6) are buried in the soil, and the equipment box or test pile housing (4) installed on the ground and the DC / DC boost module (3) and the voltage regulation module (7) installed in the housing (4); the grounding body (1), the positive terminal of the DC / DC boost module (3) input terminal, the negative terminal of the DC / DC boost module (3) input terminal and the sacrificial anode (2) are connected in sequence; in the output circuit of the DC / DC boost module (3) of the power supply, the voltage regulation module (7) and the manual switch (8) are connected in series, the positive terminal of the output terminal of the voltage regulation module (7) is connected to the auxiliary anode (6) through the manual switch (8), and the negative terminal of the output terminal of the voltage regulation module (7) is connected to the pipe (5) through the manual switch (8). The manual switch (8) can be a single switch that turns on or off only one of the cathode wire or the auxiliary anode wire, or it can be a double switch that turns on or off both the cathode wire or the auxiliary anode wire at the same time; the voltage regulating module (7) is used to regulate the protection potential of the pipeline (5).

[0024]

[0027] In Figure 3 In the circuit diagram of the constant potential type of the anode scheme: the grounding body (1), sacrificial anode (2), pipe (5) and auxiliary anode (6) are buried in the soil, and the sensor module (10) is buried in the soil near the pipe; the DC / DC boost module (3), passive potentiostat (9) and energy storage module (11) are installed in the housing (4) of the equipment box or test pile on the ground.

[0028] Connect the grounding body (1), the positive terminal of the DC / DC boost module (3) input, the negative terminal of the DC / DC boost module (3) input, and the sacrificial anode (2) in sequence. In the power output circuit of the DC / DC boost module (3), connect the corresponding positive and negative terminals of the power input terminal of the passive potentiostat (9) and the power input terminal of the energy storage module (11) in parallel. Connect the anode terminal of the output circuit of the passive potentiostat (9) to the auxiliary anode (6), connect the cathode terminal and the zero-position cathode terminal to the pipe (5), connect the reference terminal to the sensor module (10) buried in the soil near the pipe (5), and connect the data output terminal of the passive potentiostat (9) to the data line (12) and lead it out of the housing (4) to connect to the communication facilities outside the system for data transmission.

[0029] In this embodiment, the passive potentiostat (9) is a two-output passive potentiostat (9) with one anode, two cathodes, two zero-position cathodes and two reference terminals. It can also be a multi-output passive potentiostat (9) composed of one anode terminal and N cathodes, two zero-position cathodes and two reference terminals. The sensor module (10) can be a reference electrode, a reference tube or a polarization probe. The energy storage module (11) can be a battery or a capacitor installed separately in parallel, or a battery and a capacitor installed in parallel at the same time.

[0025]

[0030] In Figure 4 In the circuit diagram of the sacrificial anode boost power supply cathodic protection system of the common sacrificial anode scheme: the grounding body (1), sacrificial anode (2) and pipe (5) are buried in the soil; the DC / DC boost module (3), voltage regulating module (7) and manual switch (8) are installed in the housing (4) of the equipment box or test pile on the ground.

[0031] The grounding body (1), the positive input terminal of the DC / DC boost module (3), the negative input terminal of the DC / DC boost module (3), and the sacrificial anode (2) are connected in sequence; the output terminal of the DC / DC boost module (3), the voltage regulating module (7), and the manual switch (8) are connected in series; the pipe (5) is connected in sequence, and the negative terminal of the voltage regulating module (7) is connected through the manual switch (8), and the positive output terminal of the voltage regulating module (7) is connected in sequence and then connected to the sacrificial anode (2) through the manual switch (8), thus forming a common sacrificial anode protection system;

[0032] In Figure 5 In the circuit wiring diagram of the local test type of the common sacrificial anode scheme, a test wiring board (15) is added inside the housing (4). The terminals of the test wiring board (15) are electrically connected to the positive and negative terminals of the output terminal of the voltage regulating module (7), the pipe (5) and the grounding body (1) respectively to form a test circuit. The negative terminal of the voltage regulating module (7) is connected in series with the manual switch (8) and then electrically connected to the pipe (5). The positive terminal of the voltage regulating module (7) is electrically connected to the sacrificial anode (2).

[0026]

[0033] In Figure 6 In the constant potential type circuit diagram of the common sacrificial anode scheme, the sacrificial anode (2), the pipe (5) and the grounding body (1) are buried in the soil, and the sensor module (10) is buried near the pipe; the equipment box or test pile housing (4) is installed on the ground, and the DC / DC boost module (3), the potentiostat (9) and the energy storage module (11) are installed in the housing.

[0034] The grounding body (1), the positive terminal of the DC / DC boost module (3) input terminal, the negative terminal of the DC / DC boost module (3) input terminal, and the sacrificial anode (2) are connected in sequence. The output circuit of the DC / DC boost module (3) is connected in parallel to the power input terminals of the passive potentiostat (9) and the energy storage module (11) and supplies power to them. The anode terminal of the output circuit of the passive potentiostat (9) is connected to the lead wire of the sacrificial anode (2). The anode terminal of the output circuit of the passive potentiostat (9) and the negative terminal of the input circuit are connected to the sacrificial anode (2). The cathode terminal and the zero-position cathode terminal of the output circuit of the passive potentiostat (9) are connected to the pipe (5) respectively. The reference terminal is connected to the sensor module (10). The data output terminal is connected to the data line (12) and led out of the housing to connect with the communication facilities outside the system for data transmission.

[0027]

[0035] In Figure 7 In the circuit diagram of the dual sacrificial anode scheme, the sacrificial anode (2), the grounding body (1) of the pipe (5) are buried in the soil, and the sensor module (10) is buried in the soil near the pipe (5). The sacrificial anode (2) consists of two sacrificial anodes (2) buried independently. The DC / DC boost module (3), the energy storage module (11), the synchronous power-off switch (13) and the data acquisition module (14) are installed in the equipment box or test pile housing on the ground.

[0036] The grounding body (1), the positive terminal of the DC / DC boost module (3) input terminal, the negative terminal of the DC / DC boost module (3) input terminal, and the sacrificial anode (2) for power supply are connected in sequence to form the sacrificial anode input circuit of the boost circuit DC / DC boost module (3); the output circuit of the DC / DC boost module (3) is connected in parallel to the power input terminals of the synchronous power-off switch (13), the energy storage module (11), and the data acquisition module (14) to supply power to them; the pipe (5), the synchronous power-off switch (13), and the sacrificial anode (2) for protection are connected in sequence to form a switchable sacrificial anode protection circuit; the cathode terminal and the zero-position cathode terminal of the data acquisition module (14) are connected to the pipe (5), the reference terminal is connected to the sensor module (10), the data output terminal is connected to the data line (12) and led out to the outside of the housing (4) to connect with the communication facilities outside the system; the control signal terminal of the data acquisition module (14) is connected to the synchronous power-off switch (13).

Claims

1. A sacrificial anode boost power supply cathodic protection system for pipelines, comprising: The sacrificial anode, pipe, grounding electrode, and auxiliary anode buried in the soil, and the housing of the equipment box or test pile installed on the ground, are characterized by: a DC / DC boost module installed in the housing; the grounding electrode, the positive input terminal of the DC / DC boost module, the negative input terminal of the DC / DC boost module, and the sacrificial anode being connected in sequence to form the sacrificial anode input circuit of the DC / DC boost module; and the pipe, the negative output terminal of the DC / DC boost module, the positive output terminal of the DC / DC boost module, and the auxiliary anode being connected in sequence to form the forced current cathodic protection system output circuit of the DC / DC boost module.

2. The sacrificial anode boost power supply cathodic protection system according to claim 1, characterized in that: In the output circuit of the DC / DC boost module of the power supply, the voltage regulator module and the manual switch are connected in series. The positive terminal of the voltage regulator module output is connected to the auxiliary anode via the manual switch, and the negative terminal of the voltage regulator module output is connected to the pipeline via the manual switch.

3. The sacrificial anode boost power supply cathodic protection system according to claim 1, characterized in that: In the power output circuit of the DC / DC boost module, the corresponding positive and negative terminals of the power input terminals of the passive potentiostat and the energy storage module are connected in parallel. The anode terminal of the passive potentiostat output circuit is electrically connected to the auxiliary anode, the cathode terminal and the zero-position cathode terminal are electrically connected to the pipeline, and the reference terminal is electrically connected to the sensor module buried in the soil near the pipeline. The data output terminal of the passive potentiostat is connected to the data line and led out of the housing to connect with the communication facilities outside the system for data transmission. The passive potentiostat can be a single-output type with each anode, cathode, zero-position cathode and reference terminal as one channel, or a multi-output type composed of the anode terminal plus each of the cathode, zero-position cathode and reference terminals as N channels.

4. A sacrificial anode boost power supply cathodic protection system for pipelines, comprising: The grounding electrode, sacrificial anode, and pipeline buried in the soil, and the housing of the equipment box or test pile installed on the ground, are characterized by: the output terminals of the DC / DC boost module, the voltage regulating module, and the manual switch installed in the housing being connected in series in sequence; the grounding electrode, the positive input terminal of the DC / DC boost module, the negative input terminal of the DC / DC boost module, and the sacrificial anode being connected in sequence to form the sacrificial anode input circuit of the boost circuit; the pipeline being connected in sequence and then connected to the negative terminal of the voltage regulating module via the manual switch, and then connected to the positive output terminal of the voltage regulating module and then connected to the sacrificial anode via the manual switch to form the sacrificial anode protection system after the DC / DC boost module boosts the voltage; the sacrificial anode is the common anode of the input and output terminals of the DC / DC boost module.

5. The sacrificial anode boost power supply cathodic protection system according to claim 4, characterized in that: A test wiring board is added inside the housing. The terminals of the test wiring board are electrically connected to the positive and negative terminals of the voltage regulator module output, the pipe, and the grounding body, respectively, to form a test circuit. The negative terminal of the voltage regulator module is connected to the pipe after being connected in series with the manual switch, and the positive terminal of the voltage regulator module is electrically connected to the sacrificial anode.

6. The sacrificial anode boost power supply cathodic protection system according to claim 4, characterized in that: A passive potentiostat and an energy storage module are installed inside the housing, and a sensor module is buried near the pipeline. The output circuit of the DC / DC boost module is connected in parallel to the power input terminals of the passive potentiostat and the energy storage module, and supplies them with power. The anode terminal of the output circuit of the passive potentiostat is electrically connected to the sacrificial anode lead wire, and the anode terminal of the output circuit of the passive potentiostat is electrically connected to the sacrificial anode along with the negative terminal of the input circuit. The cathode terminal and the zero-position cathode terminal of the output circuit of the passive potentiostat are electrically connected to the pipeline, while the reference terminal is electrically connected to the sensor module. The data output terminal is connected to the data line and led out of the housing to connect with the communication facilities outside the system for data transmission.

7. A sacrificial anode boost power supply cathodic protection system for pipelines, comprising: The system comprises a grounding electrode, pipe, and sensor module buried in the soil, and a DC / DC boost module and energy storage module installed in an equipment box or test pile housing on the ground. The system features two independent buried sacrificial anodes. A synchronous power-off switch and a data acquisition module are added inside the housing. The grounding electrode, the positive input terminal of the DC / DC boost module, the negative input terminal of the DC / DC boost module, and the sacrificial anode for power supply are sequentially connected to form the sacrificial anode input circuit of the DC / DC boost module. The output circuit of the DC / DC boost module is connected in parallel to the power input terminals of the synchronous power-off switch, the energy storage module, and the data acquisition module, supplying them with power. The pipe, the synchronous power-off switch, and the sacrificial anode for protection are sequentially connected to form a switchable sacrificial anode protection circuit. The cathode terminal and zero-position cathode terminal of the data acquisition module are electrically connected to the pipe, the reference terminal is electrically connected to the sensor module, and the data output terminal is connected to a data line and led out to the outside of the housing for connection with external communication facilities. The control signal terminal of the data acquisition module is electrically connected to the synchronous power-off switch.

8. The sacrificial anode boost power supply cathodic protection system according to claims 1 to 7, characterized in that: The electrode potential of the sacrificial anode buried in the soil must be negative than the electrode potential of the grounding electrode and the protective potential of the pipeline.

9. The sacrificial anode boost power supply cathodic protection system according to claims 3, 6 and 7, characterized in that: The sensor module can be one of the following: a reference electrode, a reference tube, or a polarization probe.

10. The sacrificial anode boost power supply cathodic protection system according to claims 3, 6 and 7, characterized in that: The energy storage module and its connecting circuit can be one of four types of circuits: parallel-connected batteries, parallel-connected capacitors, parallel-connected batteries and capacitors, or neither batteries nor capacitors are installed.

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