CN109321923B - Buried long-distance pipeline cathode protection device based on STM32 single chip microcomputer - Google Patents

Buried long-distance pipeline cathode protection device based on STM32 single chip microcomputer Download PDF

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Publication number
CN109321923B
CN109321923B CN201811324123.5A CN201811324123A CN109321923B CN 109321923 B CN109321923 B CN 109321923B CN 201811324123 A CN201811324123 A CN 201811324123A CN 109321923 B CN109321923 B CN 109321923B
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Prior art keywords
module
pipeline
power supply
control module
output
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CN201811324123.5A
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CN109321923A (en
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崔震
李琳
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Xian Shiyou University
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Xian Shiyou University
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/04—Controlling or regulating desired parameters
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
    • C23F2213/32—Pipes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

The invention discloses a cathode protection device for a buried long-distance pipeline based on an STM32 single chip microcomputer, wherein an anode ground bed and a reference electrode are laid in soil beside the buried long-distance pipeline, and a cathode wiring point is arranged on the buried long-distance pipeline. Compared with the prior art, the main control module acquires output voltage, output current and reference potential through the AD data acquisition module, acquires the temperature of the pipeline by using the temperature sensor, and automatically adjusts the output voltage of the power supply module through the DA control module, so that the corrosion rate of the buried pipeline is greatly reduced.

Description

Buried long-distance pipeline cathode protection device based on STM32 single chip microcomputer
Technical Field
The invention relates to the technical field of buried pipeline cathode protection devices, in particular to a buried long-distance pipeline cathode protection device based on an STM32 single-chip microcomputer.
Background
The corrosion problem of buried long-distance pipelines is increasingly prominent, and great challenges are brought to corrosion control work. The reference potential is an important judgment basis for the corrosion protection of the buried long-distance pipeline. The output voltage, the output current, the reference potential of the pipeline to the ground and the temperature of the pipeline are collected through the cathode protection device. The protected condition of the pipeline can be effectively analyzed according to the collected recorded data.
At present, in the prior art, the adjustment of the cathodic protection potential needs manual rotation of a hand wheel of a voltage regulator to change the output voltage until the actual voltage is consistent with the given voltage, which wastes time and labor.
Of course, there are also cathodic protection devices in the prior art that reduce or avoid the hazards of corrosion by using cathodic protection. The structure is complex, the volume is large, and the price is high.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a cathode protection device for a buried long-distance pipeline based on an STM32 single chip microcomputer.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
the utility model provides a bury ground long distance pipeline cathodic protection device based on STM32 singlechip, has laid positive pole ground bed and reference electrode in burying ground long distance pipeline next door soil, buries ground long distance pipeline and is equipped with negative pole wiring point and zero-bit negative point, the device includes host computer, host system, AD data acquisition module, DA control module, communication module, storage module, RTC module, human-computer interaction module, power module, temperature sensor, wherein:
the output anode of the power supply module is connected with an anode ground bed through an external anode cable, and the output cathode of the power supply module is connected with a cathode wiring point on a buried long-distance transmission pipeline through an external cathode cable; the device is used for providing a power supply for the buried long-distance pipeline and providing cathodic protection current for the buried long-distance pipeline by an impressed current method;
the temperature sensor is used for collecting the temperature of the buried long-distance pipeline, and the signal output end of the temperature sensor is connected with the signal input end of the main control module;
the main control module is connected with and controls the AD data acquisition module, the DA control module, the communication module, the storage module, the RTC module and the human-computer interaction module, and is used for processing the acquired output voltage, output current, reference potential and pipeline temperature, adjusting the output voltage of the power supply module through the DA control module until the actually measured reference potential is consistent with the given potential;
the AD data acquisition module is connected with the output end of the power supply module inside the signal input end of the AD data acquisition module, is respectively connected with the reference electrode and the zero grounding cathode point through an external signal wire cable, is used for acquiring the output voltage and the output current of the power supply module and the reference potential of a buried long-distance pipeline, and transmits the acquired data to the main control module;
the signal output end of the DA control module is connected with the power supply module and is used for outputting an analog voltage signal of 0-5V and correspondingly controlling and adjusting the power supply module to output a proper voltage value;
the communication module is connected with the upper computer through an RS485 bus and/or a CAN bus and is used for remotely sending and receiving data between the main control module and the upper computer;
the upper computer is used for setting a cathode protection potential given value and displaying measured output voltage, output current, reference potential and pipeline temperature dynamic data in real time;
the storage module is used for storing the acquired output voltage and output current of the power supply module and the reference potential and temperature of the buried pipeline;
the RTC module is used for providing time for the storage module when storing data;
and the human-computer interaction module is used for setting a working state and operation parameters through human-computer interaction.
Preferably, the power module consists of an EMI filter, a rectifier circuit, a PWM driver circuit, an inverter circuit, a high frequency rectifier circuit, and a filter output circuit.
Preferably, the main control module adopts an STM32F103C8T6 chip.
Preferably, the temperature sensor is a DS18B20 sensor.
Preferably, the DA control module employs TLC5615 chips.
Preferably, the communication module comprises a MAX485 chip and/or a TJA1050T chip.
Preferably, the storage module adopts an SD card.
Preferably, the RTC module employs a DS1302 chip.
Further, the human-computer interaction module comprises two state lamps for displaying working states and physical keys for operating a plurality of working states; the state lamp comprises an operation state lamp and an automatic state lamp, and the action key comprises a starting key, a manual/automatic switching key and a manual knob.
The device also comprises a metal casing with the length of 18cm multiplied by 10cm, and the metal casing is used for fixing the main control module, the AD data acquisition module, the DA control module, the communication module, the storage module, the RTC module, the man-machine interaction module and the power supply module in the metal casing.
The principle of the invention is as follows: the main control module collects output voltage, output current and reference potential through the AD data acquisition module, the temperature sensor collects the temperature of the pipeline, and the DA control module automatically adjusts the output voltage of the power supply module, so that the corrosion rate of the buried pipeline is greatly reduced.
Compared with the prior art, the invention has the following beneficial effects:
1. the acquisition precision is high, the noise is low, the data is not lost, and the sampling rate can reach 30 ksps;
2. the acquisition parameters are multiple, 4 paths of differential inputs are used for acquiring 4 paths of data including output voltage, output current, reference potential and the like. The data can be used for processing and analyzing in the later period, so that the cathodic protection work is more accurate, and the data can be used for processing and analyzing in the later period, so that the cathodic protection work is more accurate.
3. The cost is low, and the reliability and the cost performance of the used chip and device are high.
4. Multiple communication mode, including RS485 bus communication, CAN bus communication, CAN long distance transmission and received data, reliability, stability are good, are difficult for receiving the environmental impact.
5. The multi-machine communication can be realized, and the control of a plurality of cathode protection devices is realized by setting different communication addresses.
6. And a peripheral SD card storage mode is adopted, so that the storage capacity is large, the integrity of the acquired data is ensured, and conditions are provided for researching cathode protection data in the future.
7. The system has a good human-computer interaction setting function, and supports two working modes including automatic operation control and manual control.
8. The device has compact structure and can be arranged in a metal shell with the length of 18cm, 10cm and used; the volume is small, and the installation space is saved.
9. And automatic control and adjustment, namely setting a proper cathode protection potential after calculation by an analytic method and a numerical simulation method in real time through an upper computer, and sending the potential to a main control module, so that the actual measurement reference potential is automatically controlled and adjusted, and labor is saved.
Drawings
FIG. 1 is a structural block diagram of a buried long-distance pipeline cathode protection device based on STM 32.
Fig. 2 is a schematic diagram of a front panel of the human-computer interaction module of fig. 1.
Fig. 3 is a working flow chart of the cathode protection device of the buried long-distance pipeline based on STM 32.
Fig. 4 is a circuit block diagram of the power module of the present invention.
Fig. 5 is a wiring diagram of the AD data acquisition module and the buried long-distance pipeline cathode protection device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1 and 5, the present embodiment provides a cathode protection device for a buried long distance pipeline based on an STM32 single chip microcomputer, wherein an anode ground bed 101 and a reference electrode 102 are laid in soil beside a buried long distance pipeline 10, a cathode connection point 104 and a zero negative connection point 105 are arranged on the buried long distance pipeline 10, the cathode connection point 104 and the pipeline are thermite welded in actual engineering, and the welding points are protected from corrosion by repairing-wound pieces. The zero position cathode connecting point 105 is also in thermite welding with the pipeline, the welding point is protected from corrosion by a repairing sheet, and the distance between the cathode connecting point 104 and the zero position cathode connecting point 105 is kept above 200 mm; the device includes host computer 9, host system 1, AD data acquisition module 4, DA control module 2, communication module 5, storage module 7, RTC module 8, human-computer interaction module 6, power module 3, temperature sensor 103, wherein:
in the power module 3, the output anode of the power module 3 is connected with an anode ground bed 101 through an external anode cable, and the output cathode of the power module 3 is connected with a cathode wiring point 104 on a buried long-distance pipeline through an external cathode cable; the cathode protection current is provided for the buried long-distance pipeline 10 by an impressed current method, and the output voltage value of the power supply module 3 is adjustable in real time;
the temperature sensor 103 is arranged on the buried long-distance pipeline 10 and used for collecting the temperature of the buried long-distance pipeline 10, and the signal output end of the temperature sensor 103 is connected with the signal input end of the main control module 1; the temperature sensor 103 adopts a DS18B20 sensor;
the main control module 1 is connected with and controls the AD data acquisition module 4, the DA control module 2, the communication module 5, the storage module 7, the RTC module 8 and the human-computer interaction module 6, and is used for processing the acquired output voltage, output current, reference potential and pipeline temperature, adjusting the output voltage of the power supply module 3 through the DA control module 2 until the actually measured reference potential is consistent with the given potential;
the AD data acquisition module 4 is characterized in that the inside of a signal input end of the AD data acquisition module 4 is connected with the output end of the power supply module 3, and is respectively connected with the reference electrode 102 and the zero-position cathode 105 through an external signal wire and cable, and is used for acquiring the output voltage and the output current of the power supply module 3 and the reference potential of the buried long-distance pipeline 10 and transmitting the acquired data to the main control module 1;
the signal output end of the DA control module 2 is connected with the power supply module 3, and is used for outputting an analog voltage signal of 0-5V and correspondingly controlling and adjusting the power supply module 3 to output a proper voltage value;
the communication module 5 is connected with the upper computer 9 through an RS485 bus and/or a CAN bus and is used for remotely sending and receiving data between the main control module 1 and the upper computer 9;
the upper computer 9 is used for setting a cathode protection potential given value and displaying measured output voltage, output current, reference potential and pipeline temperature dynamic data in real time;
the storage module 7 is used for storing the acquired output voltage and output current of the power supply module 3 and the reference potential and temperature of the buried pipeline 10;
the RTC module 8 is used for providing time for the storage module 7 to store data;
and the human-computer interaction module 6 is used for setting working states and operation parameters through human-computer interaction.
In this embodiment, as shown in fig. 4, the power module 3 is composed of an EMI filter, a rectifier circuit, a PWM driver circuit, an inverter circuit, a high-frequency rectifier circuit, and a filter output circuit. The power supply is externally connected with three-phase alternating current of a power grid, and an EMI filter is required to be added at the input end of the power supply in order to reduce interference; and the alternating current is inverted after passing through the rectifying circuit, and finally passes through the high-frequency rectifying circuit and the filtering output circuit until being output by direct current, and the current is fed back to the PWM driving circuit after being sampled. The DA control module 2 adjusts the output duty ratio of the PWM driving circuit, thereby controlling the inverter circuit and changing the size of the direct current output value.
In this embodiment, the main control module 1 adopts an STM32F103C8T6 chip.
In this embodiment, the AD data acquisition module 4 employs an ADs1256 chip, and its peripheral circuit includes an output voltage acquisition circuit, an output current acquisition circuit, and a reference potential acquisition circuit.
In this embodiment, the DA control module 2 employs a TLC5615 chip.
In this embodiment, the communication module 5 includes a MAX485 chip and/or a TJA1050T chip.
In this embodiment, the storage module 7 is an SD card.
In this embodiment, the RTC module 8 adopts a DS1302 chip.
In this embodiment, as shown in fig. 2, the human-computer interaction module 6 includes two status lights for displaying the working status and a physical button for operating a plurality of working statuses; the status lights include an operation status light 64 and an automatic status light 65, and the action keys include an activation key 61, a manual/automatic switching key 62 and a manual knob 63.
In this embodiment, the main control module 1, the AD data acquisition module 4, the DA control module 2, the communication module 5, the storage module 7, the RTC module 8, the human-computer interaction module 6, and the power supply module 3 may be fixed in a metal casing (shown in the figure) of 18cm × 10 cm.
As shown in fig. 2 and 3, the working process of the invention is as follows:
and a three-phase power line is connected to a rear panel of the metal casing, a grounding wire, a zero-position negative wire and a reference electrode wire are connected, and an RS485/CAN bus is connected to an upper computer. After the device is installed and put into operation, the starting switch key is pressed, and after the device is electrified, the running state lamp is lighted. The device starts to collect cathodic protection parameters (output voltage, output current, reference potential, pipeline temperature). The storage of cathodic protection parameters (output voltage, current, reference potential, pipeline temperature) to the SD card is started. When a manual/automatic switching key is pressed, the automatic state lamp is turned on, the cathode protection potential set value is set through the upper computer at the moment, signals are transmitted to the device main control module through the RS485/CAN bus, and the main control module controls the digital control module to output 0-5V analog signals to control the output voltage of the power supply module. Meanwhile, data acquired by the AD acquisition module are fed back to the main control module, the acquired reference potential is compared with the given potential, the given potential is subtracted from the reference potential, and if the result is positive, the voltage output is controlled to be increased; when the result is negative, control decreases the voltage output. And (4) feedback adjustment is carried out until the measured reference potential is consistent with the given potential, namely the result is zero. The voltage output is kept constant, and the reference potential is also kept constant, so that the buried long-distance pipeline is protected from corrosion.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims (1)

1. The utility model provides a bury ground long defeated pipeline cathodic protection device based on STM32 singlechip has laid positive pole ground bed and reference electrode in burying ground long defeated pipeline next door soil, buries ground long defeated pipeline and is equipped with negative pole wiring point and zero-bit and connects cloudy point, its characterized in that: the device includes host computer, host system, AD data acquisition module, DA control module, communication module, storage module, RTC module, human-computer interaction module, power module, temperature sensor, wherein:
the output anode of the power supply module is connected with an anode ground bed through an external anode cable, and the output cathode of the power supply module is connected with a cathode wiring point on a buried long-distance transmission pipeline through an external cathode cable; the device is used for providing a power supply for the buried long-distance pipeline and providing cathodic protection current for the buried long-distance pipeline by an impressed current method;
the temperature sensor is used for collecting the temperature of the buried long-distance pipeline, and the signal output end of the temperature sensor is connected with the signal input end of the main control module;
the main control module is connected with and controls the AD data acquisition module, the DA control module, the communication module, the storage module, the RTC module and the human-computer interaction module, and is used for processing the acquired output voltage, output current, reference potential and pipeline temperature, adjusting the output voltage of the power supply module through the DA control module until the actually measured reference potential is consistent with the given potential;
the AD data acquisition module is connected with the output end of the power supply module inside the signal input end of the AD data acquisition module, is respectively connected with the reference electrode and the zero grounding cathode point through an external signal wire cable, is used for acquiring the output voltage and the output current of the power supply module and the reference potential of a buried long-distance pipeline, and transmits the acquired data to the main control module;
the signal output end of the DA control module is connected with the power supply module and is used for outputting an analog voltage signal of 0-5V and correspondingly controlling and adjusting the power supply module to output a proper voltage value;
the communication module is connected with the upper computer through an RS485 bus and/or a CAN bus and is used for remotely sending and receiving data between the main control module and the upper computer;
the upper computer is used for setting a cathode protection potential given value and displaying measured output voltage, output current, reference potential and pipeline temperature dynamic data in real time;
the storage module is used for storing the acquired output voltage and output current of the power supply module and the reference potential and temperature of the buried pipeline;
the RTC module is used for providing time for the storage module when storing data;
the human-computer interaction module is used for setting working states and operation parameters through human-computer interaction;
the power supply module consists of an EMI filter, a rectifier circuit, a PWM drive circuit, an inverter circuit, a high-frequency rectifier circuit and a filter output circuit; the main control module adopts an STM32F103C8T6 chip; the temperature sensor adopts a DS18B20 sensor; the DA control module adopts a TLC5615 chip; the communication module comprises a MAX485 chip and/or a TJA1050T chip; the storage module adopts an SD card; the RTC module adopts a DS1302 chip; the human-computer interaction module comprises two state lamps for displaying working states and physical keys for operating a plurality of working states; the state lamp comprises an operating state lamp and an automatic state lamp, and the action key comprises a start key, a manual/automatic switching key and a manual knob; the device also comprises a metal casing with the thickness of 18cm by 10cm, and the metal casing is used for fixing the main control module, the AD data acquisition module, the DA control module, the communication module, the storage module, the RTC module, the human-computer interaction module and the power supply module in the metal casing.
CN201811324123.5A 2018-11-08 2018-11-08 Buried long-distance pipeline cathode protection device based on STM32 single chip microcomputer Expired - Fee Related CN109321923B (en)

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CN111809187A (en) * 2019-04-12 2020-10-23 西安英柯迈信息技术有限公司 High-precision cathode protection potential constant maintaining device and method
CN112210782B (en) * 2020-10-13 2022-09-09 西安石油大学 Distributed station control cathode protection system
CN112522713A (en) * 2020-12-24 2021-03-19 西南石油大学 Long-distance pipeline protection device for crossing highway
CN112962101B (en) * 2021-02-01 2022-04-12 大连理工大学 Multi-reference-electrode potentiostat for buried pipeline and use method thereof

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CN201125267Y (en) * 2007-10-09 2008-10-01 东营市永雄科技有限责任公司 Intelligent frequency conversion constant electric potential instrument
CN202903233U (en) * 2012-07-04 2013-04-24 中国石油天然气股份有限公司 System for automatically monitoring the parameters of a low temperature type buried oil and gas pipeline
CN107313052B (en) * 2016-04-26 2023-10-31 西安电子科技大学 Pipeline cathode potential synchronous detection system and detection method

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