CN114944261B - Pipeline demagnetizing and heating integrated control system and method - Google Patents

Pipeline demagnetizing and heating integrated control system and method Download PDF

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Publication number
CN114944261B
CN114944261B CN202210761167.4A CN202210761167A CN114944261B CN 114944261 B CN114944261 B CN 114944261B CN 202210761167 A CN202210761167 A CN 202210761167A CN 114944261 B CN114944261 B CN 114944261B
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China
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module
demagnetizing
pipeline
heating
current
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CN114944261A (en
Inventor
惠文颖
牛健壮
周彬
胡江锋
赵康
郑承勇
逄仁刚
武泽
陈健
付永勇
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Pipe Network Group Xinjiang United Pipeline Co ltd
China Oil and Gas Pipeline Network Corp
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Pipe Network Group Xinjiang United Pipeline Co ltd
China Oil and Gas Pipeline Network Corp
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Priority to CN202210761167.4A priority Critical patent/CN114944261B/en
Publication of CN114944261A publication Critical patent/CN114944261A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • General Induction Heating (AREA)

Abstract

The invention discloses a pipeline demagnetizing and heating integrated control system and a pipeline demagnetizing and heating integrated control method, wherein the system comprises a coil, a magnetic field detection module, a temperature detection module, an embedded system controller, an alternating current demagnetizing module, a direct current demagnetizing module and an intermediate frequency heating module; the coil is wound on the pipeline, one end of the coil is connected with the first common wiring terminal of the alternating current degaussing module, the direct current degaussing module and the intermediate frequency heating module, and the other end of the coil is connected with the alternating current wiring terminal of the alternating current degaussing module or the second common wiring terminal of the direct current degaussing module and the intermediate frequency heating module; the embedded system controller is respectively and electrically connected with the alternating current degaussing module, the direct current degaussing module and the intermediate frequency heating module. The pipeline demagnetizing device can realize pipeline demagnetizing and simultaneously heat the pipeline, further improve the fire operating efficiency, reduce the use of operation field equipment and simultaneously meet the requirements of pipeline heating and demagnetizing by using one set of equipment.

Description

Pipeline demagnetizing and heating integrated control system and method
Technical Field
The invention relates to the technical field of pipeline construction, in particular to a pipeline demagnetizing and heating integrated control system and method.
Background
In the prior art, the following problems exist in pipeline degaussing and pipe orifice heating during fire and rescue operation:
during welding operation, degaussing and pipe orifice heating are required to be carried out synchronously, and the degaussing coil and the heating coil are required to be distributed within 10CM from the pipe orifice to play a role in degaussing and heating, but the existing pipeline degaussing machine and intermediate frequency heating are required to be wound with cables, so that the cables of the pipeline degaussing machine are close to the pipe orifice (10 CM), and the intermediate frequency heating cables are far away from the pipe orifice, so that the pipe orifice degaussing and heating cannot simultaneously meet the requirements of on-site pipe exchange operation.
The demagnetizing and the pipe orifice heating are independent devices, the coils are independently wound, 2 sets of medium-frequency heating devices and 2 pipeline demagnetizing devices are generally required to be configured on site, the volume of the devices is large, and the carrying is inconvenient.
Disclosure of Invention
The invention aims to solve the technical problems existing in the prior art and provides a pipeline demagnetizing and heating integrated control system and a pipeline demagnetizing and heating integrated control method.
In order to solve the above technical problems, an embodiment of the present invention provides a pipeline demagnetizing and heating integrated control system, including: coil L, magnetic field detection module M6, temperature detection module M7, embedded system controller M1, alternating current degaussing module, direct current degaussing module and intermediate frequency heating module; the coil L is wound on a pipeline, one end of the coil L is used as a fixed end d to be connected with a first public terminal a of the alternating current degaussing module, the direct current degaussing module and the intermediate frequency heating module, and the other end of the coil L is used as a movable end e to be connected with an alternating current terminal b of the alternating current degaussing module or connected with a second public terminal c of the direct current degaussing module and the intermediate frequency heating module; the magnetic field sensor Hall probe of the magnetic field detection module M6 is arranged at the welding end face of the pipeline and is electrically connected with the embedded system controller M1, and the embedded system controller M1 is respectively and electrically connected with the alternating current demagnetizing module, the direct current demagnetizing module and the intermediate frequency heating module; the temperature sensor probe of the temperature detection module M7 is placed at a position outside the pipeline corresponding to the coil L and is electrically connected with the intermediate frequency heating module.
The beneficial effects of the invention are as follows: when the pipeline is demagnetized, the pipeline can be heated by one cable, the fire operating efficiency can be further improved, meanwhile, the use of operation field equipment can be reduced, and the requirements of pipeline heating and demagnetizing can be met by one set of equipment.
On the basis of the technical scheme, the invention can be improved as follows.
Further, when the movable end e of the coil L is connected with the ac terminal b of the ac demagnetizing module, the embedded system controller M1 controls the ac demagnetizing module to perform ac demagnetizing; when the movable end e of the coil L is connected with the second common terminal c of the dc demagnetizing module and the intermediate frequency heating module, the embedded system controller M1 controls the dc demagnetizing module to perform dc demagnetizing and/or the intermediate frequency heating module to perform intermediate frequency heating.
The beneficial effect of adopting the above-mentioned further scheme is that under the alternating current degaussing mode (i.e. the movable end e of L is connected with the alternating current wiring terminal b of alternating current degaussing module), the strong magnetism in the pipeline is reduced to a preset value (for example 100 Gauss is a relatively low level) by adopting alternating current degaussing firstly, then the pipeline is switched to the degaussing heating mode (i.e. the movable end e of coil L is connected with the second public wiring terminal c of direct current degaussing module and intermediate frequency heating module), and then the residual magnetism of the pipeline which has fallen a lot is counteracted by using direct current degaussing, and then the pipeline degaussing and heating can be simultaneously carried out by starting the heating function. The heating and demagnetizing can be performed simultaneously or separately.
Further, the alternating current demagnetizing module comprises a solid-state relay Q5, a step-up transformer T1, a rectifier bridge BG1, a second resistor R2, a fifth capacitor C5, a voltmeter, a silicon controlled rectifier SCR1 and a seventh diode D7; the low-voltage winding of the step-up transformer T1 is connected to an alternating-current power supply through the solid-state relay Q5; the high-voltage winding of the step-up transformer T1 is connected with the input end of a rectifier BG1, the first output end of the rectifier BG1 is respectively connected with one end of a fifth capacitor C5 and an alternating current terminal b of the alternating current demagnetizing module through a second resistor R2, and the second output end of the rectifier BG1 is respectively connected with the other end of the fifth capacitor C5, one end of a silicon controlled rectifier SCR1 and the positive electrode of a seventh diode D7; the other end of the silicon controlled rectifier SCR1 and the negative electrode of the seventh diode D7 are connected with a first common terminal a; the embedded system controller M1 is connected with the control end of the solid state relay Q5, the other end of the fifth capacitor C5 and the control end of the silicon controlled rectifier SCR 1; the input end of the voltmeter is connected with two ends of the fifth capacitor C5, and the output end of the voltmeter is connected with the embedded system controller M1 and is used for collecting voltages at two ends of the fifth capacitor C5.
Further, the movable end e of the coil L is connected to the ac terminal b of the ac demagnetizing module, and the embedded system controller M1 is configured to control the SCR1 to be turned on when the voltage on the fifth capacitor C5 reaches a preset value, and the high voltage on the fifth capacitor C5 performs LC damping oscillation through a discharge loop formed by the coil L, the SCR1 and the diode D7, so as to generate an ac demagnetizing magnetic field, and reduce the magnetic field strength in the pipeline.
The beneficial effect of adopting the above-mentioned further scheme is that, coil L's active end e is connected with the alternating current wiring end b of exchanging demagnetization module, charges fifth electric capacity C5 earlier, when the voltage on the fifth electric capacity C5 reaches the default, control silicon controlled rectifier SCR1 switches on, carries out LC damping vibration through the discharge loop that coil L, silicon controlled rectifier SCR1 and diode D7 are constituteed, produces and exchanges the demagnetization magnetic field, carries out exchanging demagnetization to the strong magnetic field in the pipeline.
Further, the direct current demagnetizing module comprises an AC/DC module M3 and an AC/DC isolation module M4; the embedded system controller M1 is connected with the control end of the AC/DC module M3, the input end of the AC/DC module M3 is connected with an AC power supply, the first output end of the AC/DC module M3 is connected with the first common terminal a, the second output end of the AC/DC module M3 is connected with the AC/DC isolation module M4, and the AC/DC isolation module M4 is connected with the second common terminal c.
Further, when the movable end e of the coil L is connected to the second common terminal c of the DC demagnetizing module and the intermediate frequency heating module, the embedded system controller M1 is configured to send a DC demagnetizing current control command to the AC/DC module M3, and the AC/DC module M3 outputs a corresponding DC according to the DC demagnetizing current control command, and loads the DC to the coil L after being isolated by the AC/DC isolation module M4, so as to generate a reverse magnetic field to offset the residual magnetic field in the pipeline.
The beneficial effect of adopting above-mentioned further scheme is, coil L's active end e is connected with the second common wiring terminal c of direct current demagnetization module and intermediate frequency heating module, changes alternating current into direct current through the AC/DC module, adds direct current to coil L and produces a reverse magnetic field to offset the residual magnetic field in the pipeline.
Further, the intermediate frequency heating module comprises a heating control module M2, a bridge rectifier module, a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, a fourth IGBT module Q4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a first resistor R1;
the input end of the bridge rectifier module is connected with a three-phase power supply, and the two output ends of the bridge rectifier module are respectively connected with a first serial branch formed by serially connecting a first IGBT module Q1 and a fourth IGBT module Q4 and a second serial branch formed by serially connecting a second IGBT module Q2 and a third IGBT module; the common ends of the first IGBT module Q1 and the fourth IGBT module Q4 are connected with the first common terminal a through the fourth capacitor C4, and the common ends of the second IGBT module Q2 and the third IGBT module Q3 are connected with the second common terminal C through the first resistor R1; the heating control module M2 is respectively connected with control ends of the first IGBT module Q1, the second IGBT module Q2, the third IGBT module Q3 and the fourth IGBT module Q4, and a first capacitor C1, a second capacitor C2 and a third capacitor C3 are connected in parallel between two output ends of the bridge rectifier module.
Further, when the movable end e of the coil L is connected to the second common terminal c, the embedded system controller M1 is configured to send a heating control command to the heating control module M2, and the heating control module M2 is configured to generate a PWM signal according to the heating control command, and control, by using the PWM signal, the first module formed by the first IGBT module Q1 and the third IGBT module Q3 and the second module formed by the second IGBT module Q2 and the fourth IGBT module Q4 to be turned on in turn, so that the pipeline is subjected to intermediate frequency heating in a circulation manner.
The heating control module M2 sends PWM waveforms to control the conduction of Q1, Q3, Q2 and Q4 in turn, so that current waveforms of positive half waves and negative half waves flow in the coil in turn, and the intermediate frequency heating is performed on the pipeline in a circulating way.
Further, the above technical scheme further includes a man-machine interaction module M5, where the man-machine interaction module M5 is connected with the embedded system controller M1.
The beneficial effect of adopting above-mentioned further scheme is, can control embedded system controller through man-machine interaction module to realize the intelligent control of degaussing heating.
In order to solve the technical problems, the invention also provides a pipeline demagnetizing and heating integrated control method, which is realized by using the pipeline demagnetizing and heating integrated control system according to the technical scheme, and comprises the following steps:
when the movable end e of the coil L is connected with the alternating-current wiring terminal b of the alternating-current degaussing module, the embedded system controller M1 controls the alternating-current degaussing module to conduct alternating-current degaussing;
when the movable end e of the coil L is connected with the second common wiring terminal c of the direct-current demagnetizing module and the intermediate-frequency heating module, the embedded system controller M1 controls the direct-current demagnetizing module to perform direct-current demagnetizing and/or the intermediate-frequency heating module to perform intermediate-frequency heating.
Additional aspects of the invention and advantages thereof will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a pipeline demagnetizing and heating integrated control system according to an embodiment of the present invention;
fig. 2 is a circuit configuration diagram of a pipeline demagnetizing and heating integrated control system according to an embodiment of the present invention.
Detailed Description
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It is to be noted that the various methods of embodiments described below are within the scope of the appended claims, and it is apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is illustrative only. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
As shown in fig. 1 and fig. 2, the integrated control system for demagnetizing and heating a pipeline according to an embodiment of the present invention includes: coil L, magnetic field detection module M6, temperature detection module M7, embedded system controller M1, exchange demagnetization module, direct current demagnetization module and intermediate frequency heating module.
The coil L is wound on the pipeline, one end of the coil L is used as a fixed end d to be connected with a first public terminal a of the alternating current degaussing module, the direct current degaussing module and the intermediate frequency heating module, and the other end of the coil L is used as a movable end e to be connected with an alternating current terminal b of the alternating current degaussing module or connected with a second public terminal c of the direct current degaussing module and the intermediate frequency heating module; the magnetic field sensor Hall probe of the magnetic field detection module M6 is arranged at the welding end face of the pipeline and is electrically connected with the embedded system controller M1, and the embedded system controller M1 is respectively and electrically connected with the alternating current demagnetizing module, the direct current demagnetizing module and the intermediate frequency heating module; the temperature sensor probe of the temperature detection module M7 is placed at a position outside the pipeline corresponding to the coil L and is electrically connected with the intermediate frequency heating module.
In the embodiment of the invention, a first public terminal a of the alternating current degaussing module, the direct current degaussing module and the intermediate frequency heating module is connected with a fixed end d of the coil L, and a movable end e of the coil L can be connected with an alternating current terminal b of the alternating current degaussing module for realizing alternating current degaussing; the movable end e of the coil may also be connected to the second common terminal c of the dc degaussing module and the intermediate frequency heating module for achieving dc degaussing and/or intermediate frequency heating.
The embedded system controller M1 can detect magnetic field signals at the welding end face of the pipeline through the magnetic field detection module M6, so that alternating current degaussing commands can be conveniently sent to the alternating current degaussing module or direct current degaussing commands can be conveniently sent to the direct current degaussing module according to the magnetic field intensity and the magnetic field direction.
The heating control module M2 can detect temperature signals at positions outside the pipeline corresponding to the coils L through the temperature detection module M7, and the heating control module M2 can conveniently perform intermediate-frequency heating control according to the temperature signals.
In the embodiment of the present invention, the embedded system controller M1 may include a single chip microcomputer and an analog circuit, for implementing signal processing and control functions. The heating control module M2 can comprise a singlechip and an IGBT driving circuit and is used for driving the IGBT in the intermediate frequency heating module to be turned on or turned off.
According to the embodiment of the invention, the pipeline can be demagnetized and heated by one cable, the fire operating efficiency can be further improved, meanwhile, the use of operation field equipment can be reduced, and the requirements of pipeline heating and demagnetizing can be met by using one set of equipment.
Optionally, when the movable end e of the coil L is connected with the ac terminal b of the ac degaussing module, the embedded system controller M1 controls the ac degaussing module to perform ac degaussing; when the movable end e of the coil L is connected with the direct-current demagnetizing module and the second common wiring terminal c of the intermediate-frequency heating module, the embedded system controller M1 controls the direct-current demagnetizing module to demagnetize and/or controls the intermediate-frequency heating module to heat in an intermediate frequency.
In the embodiment of the invention, in the alternating current degaussing mode (i.e. the movable end e of the coil L is connected with the alternating current terminal b of the alternating current degaussing module), the strong magnetism in the pipeline is reduced to a preset value (for example, 100 gauss is a lower level) by adopting alternating current degaussing, then the pipeline is switched to the degaussing heating mode (i.e. the movable end e of the coil L is connected with the direct current degaussing module and the second common terminal c of the intermediate frequency heating module), a great deal of pipeline residual magnetism which has been lowered is counteracted by direct current degaussing, and then the pipeline degaussing and the heating can be simultaneously carried out by starting the heating function. The heating and demagnetizing can be performed simultaneously or separately.
Optionally, the alternating current demagnetizing module comprises a solid-state relay Q5, a step-up transformer T1, a rectifier bridge BG1, a second resistor R2, a fifth capacitor C5, a voltmeter, a SCR1 and a seventh diode D7; the low-voltage winding of the step-up transformer T1 is connected to an ac power supply through a solid-state relay Q5.
The high-voltage winding of the step-up transformer T1 is connected with the input end of the rectifier BG1, the first output end of the rectifier BG1 is respectively connected with one end of the fifth capacitor C5 and the alternating current terminal b through the second resistor R2, and the second output end of the rectifier BG1 is respectively connected with the other end of the fifth capacitor C5, one end of the silicon controlled rectifier SCR1 and the anode of the seventh diode D7; the other end of the silicon controlled rectifier SCR1 and the negative electrode of the seventh diode D7 are connected with a first common terminal a; the embedded system controller M1 is connected with the control end of the solid state relay Q5, the other end of the fifth capacitor C5 and the control end of the silicon controlled rectifier SCR 1; the input end of the voltmeter is connected with two ends of the fifth capacitor C5, and the output end of the voltmeter is connected with the embedded system controller M1 and is used for collecting voltages at two ends of the fifth capacitor C5.
Optionally, when the movable end e of the coil L is connected with the ac terminal b of the ac demagnetizing module, the embedded system controller M1 is configured to control the SCR1 to be turned on when the voltage on the fifth capacitor C5 reaches a preset value, and the high voltage on the fifth capacitor C5 performs LC damping oscillation through a discharge loop formed by the coil L, the SCR1 and the diode D7, so as to generate an ac demagnetizing magnetic field, and reduce the magnetic field strength in the pipeline.
The AC220V AC power input is connected to the low-side winding of the step-up transformer T1 through the solid state relay Q5, and the high-voltage winding of the step-up transformer T1 charges the fifth capacitor C5 through the rectifier bridge BG1 and the second resistor (current limiting resistor) R2. When the voltage on the fifth capacitor C5 reaches 2500V, the embedded system controller M1 sends out high level to enable the silicon controlled rectifier SCR1 to be conducted, the high voltage on the fifth capacitor C5 carries out LC damping oscillation through a discharge loop formed by the external coil L, the silicon controlled rectifier SCR1 and the seventh diode D7, an alternating current demagnetizing magnetic field is generated, and the strong magnetic field in the pipeline is reduced.
Optionally, the direct current demagnetizing module comprises an AC/DC module M3 and an AC/DC isolation module M4; the embedded system controller M1 is connected with the control end of the AC/DC module M3, the input end of the AC/DC module M3 is connected with an AC220V alternating current power supply, the first output end of the AC/DC module M3 is connected with the first common terminal a, the second output end of the AC/DC module M3 is connected with the AC/DC isolation module M4, and the AC/DC isolation module M4 is connected with the second common terminal c. The AC/DC module M3 is used for converting an AC220V 50/60HZ power supply into direct current. The AC/DC isolation module M4 is used to isolate AC from DC.
Optionally, when the movable end e of the coil L is connected to the second common terminal c of the DC demagnetizing module and the intermediate frequency heating module, the embedded system controller M1 is configured to send a DC demagnetizing current control command to the AC/DC module M3, where the AC/DC module M3 outputs a corresponding DC according to the DC demagnetizing current control command, and the AC/DC isolation module M4 isolates the DC and loads the DC onto the coil L to generate a reverse magnetic field to offset the residual magnetic field in the pipeline.
The AC220V alternating current power supply is input into the AC/DC module M3, the AC220V alternating current is changed into 0-200A continuously adjustable direct current, the direct current is added to the coil L, and a reverse magnetic field is generated to offset the residual magnetic field in the pipeline.
Optionally, the intermediate frequency heating module includes a heating control module M2, a bridge rectifier module, a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, a fourth IGBT module Q4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a first resistor R1. The bridge rectifier module includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6.
The input end of the bridge rectifier module is connected with a three-phase power supply, and the two output ends of the bridge rectifier module are respectively connected with a first serial branch formed by serial connection of a first IGBT module Q1 and a fourth IGBT module Q4 and a second serial branch formed by serial connection of a second IGBT module Q2 and a third IGBT module; the common end of the first IGBT module Q1 and the common end of the fourth IGBT module Q4 are connected with a first common terminal a through a fourth capacitor C4, and the common end of the second IGBT module Q2 and the common end of the third IGBT module Q3 are connected with a second common terminal C through a first resistor R1; the heating control module M2 is respectively connected with control ends of the first IGBT module Q1, the second IGBT module Q2, the third IGBT module Q3 and the fourth IGBT module Q4, and a first capacitor C1, a second capacitor C2 and a third capacitor C3 are connected in parallel between two output ends of the bridge rectifier module.
Optionally, when the movable end e of the coil L is connected to the second common terminal c, the embedded system controller M1 is configured to send a heating control command to the heating control module M2, where the heating control module M2 is configured to generate a PWM signal according to the heating control command, and the PWM signal is used to control the first module formed by the first IGBT module Q1 and the third IGBT module Q3 to be alternately turned on with the second module formed by the second IGBT module Q2 and the fourth IGBT module Q4, so that the pipeline is heated by the intermediate frequency in a circulation manner.
The three-phase power AC380V 50HZ/60HZ is added on the IGBT module after bridge rectification, and PWM waveforms are sent out by the heating control module M2 to control the IGBT Q1 and Q3 and Q2 and Q4 to conduct alternately. When Q2 and Q4 are low and Q1 and Q3 are high, the Q1 and Q3 IGBTs are turned on to cause a current waveform of positive half wave to flow in the coil L. When Q1 and Q3 are low level and Q2 and Q4 are high level, the Q2 and Q4 IGBT are conducted to enable current waveform of negative half wave to flow in the coil, and the pipeline is heated at intermediate frequency in a circulating mode.
Optionally, the embodiment further includes a man-machine interaction module M5, where the man-machine interaction module M5 is connected to the embedded system controller M1. The magnetic field detection module M6 can adopt a Gaussian meter, and a Hall probe of the Gaussian meter is placed at the welding end face of the pipeline. The temperature detection module M7 may employ a temperature sensor, and a temperature sensor probe is disposed at a position outside the pipe corresponding to the coil L.
The embodiment of the invention also provides a pipeline demagnetizing and heating integrated control method, which is realized by using the pipeline demagnetizing and heating integrated control system of the technical scheme, and comprises the following steps: when the movable end e of the coil L is connected with the alternating-current wiring terminal b of the alternating-current degaussing module, the embedded system controller M1 controls the alternating-current degaussing module to conduct alternating-current degaussing; when the movable end e of the coil L is connected with the second common wiring terminal c of the direct-current demagnetizing module and the intermediate-frequency heating module, the embedded system controller controls the direct-current demagnetizing module to perform direct-current demagnetizing and/or the intermediate-frequency heating module to perform intermediate-frequency heating.
The embodiment of the invention can obtain the following technical effects for the diameter of the pipeline less than or equal to 1219 mm:
(1) Demagnetizing range: single side magnetic field strength: h is more than or equal to 300Gs; unilateral magnetic field elimination time: t is less than or equal to 15min; gap magnetic field intensity of the tube orifice after assembly: h is less than or equal to 2000Gs; the time T for eliminating the intensity of the gap magnetic field is less than or equal to 20min; single side and gap magnetic field strength after demagnetization: h is less than or equal to 20Gs; stabilization time after degaussing: t is more than or equal to 24 hours.
(2) Heating range: heating temperature range of the surface (hollow pipe) of the pipeline welding port: heating to 180 ℃ at 10-180 ℃ for the time required by: t is less than or equal to 20min; stabilization time: t is more than or equal to 24 hours;
the embodiment of the invention can effectively improve the operation efficiency of the oil and gas pipeline fire operation site, reduce the operation intensity of labor personnel, reduce the use of operation site equipment, realize two functions of degaussing and heating by using one piece of equipment, and improve and enhance the advancement and creativity of pipeline maintenance equipment in the petroleum and natural gas fields.
The embodiment of the invention is suitable for the operation degaussing and heating requirements of long oil and gas pipelines in petroleum and petrochemical industries, solves the problems that the existing direct current pipeline has high power consumption, high current, high power consumption and weak degaussing capability, and the alternating current pipeline degaussing machine can only degausse strong magnetism and cannot weaken magnetism, has a heating function, ensures that the application range is not limited in the pipeline industry, can be used for the industries of steel plate welding, ship, naval vessel welding and the like of factories, and has very wide application prospect.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (10)

1. A pipeline degaussing and heating integrated control system, comprising: coil L, magnetic field detection module M6, temperature detection module M7, embedded system controller M1, alternating current degaussing module, direct current degaussing module and intermediate frequency heating module;
the coil L is wound on a pipeline, one end of the coil L is used as a fixed end d to be connected with a first public terminal a of the alternating current degaussing module, the direct current degaussing module and the intermediate frequency heating module, and the other end of the coil L is used as a movable end e to be connected with an alternating current terminal b of the alternating current degaussing module or connected with a second public terminal c of the direct current degaussing module and the intermediate frequency heating module;
the magnetic field sensor Hall probe of the magnetic field detection module M6 is arranged at the welding end face of the pipeline and is electrically connected with the embedded system controller M1, and the embedded system controller M1 is respectively and electrically connected with the alternating current demagnetizing module, the direct current demagnetizing module and the intermediate frequency heating module; the temperature sensor probe of the temperature detection module M7 is placed at a position outside the pipeline corresponding to the coil L and is electrically connected with the intermediate frequency heating module.
2. The integrated control system for demagnetizing and heating pipeline according to claim 1, wherein,
when the movable end e of the coil L is connected with the alternating-current wiring terminal b of the alternating-current demagnetizing module, the embedded system controller M1 controls the alternating-current demagnetizing module to perform alternating-current demagnetizing;
when the movable end e of the coil L is connected with the second common terminal c of the dc demagnetizing module and the intermediate frequency heating module, the embedded system controller M1 controls the dc demagnetizing module to perform dc demagnetizing and/or the intermediate frequency heating module to perform intermediate frequency heating.
3. The integrated control system for demagnetizing and heating of pipeline according to claim 1, wherein the ac demagnetizing module comprises a solid state relay Q5, a step-up transformer T1, a rectifier bridge BG1, a second resistor R2, a fifth capacitor C5, a voltmeter, a thyristor SCR1 and a seventh diode D7;
the low-voltage winding of the step-up transformer T1 is connected to an alternating-current power supply through the solid-state relay Q5; the high-voltage winding of the step-up transformer T1 is connected with the input end of a rectifier BG1, the first output end of the rectifier BG1 is respectively connected with one end of a fifth capacitor C5 and an alternating current terminal b of the alternating current demagnetizing module through a second resistor R2, and the second output end of the rectifier BG1 is respectively connected with the other end of the fifth capacitor C5, one end of a silicon controlled rectifier SCR1 and the positive electrode of a seventh diode D7; the other end of the silicon controlled rectifier SCR1 and the negative electrode of the seventh diode D7 are connected with the first common terminal a; the embedded system controller M1 is connected with the control end of the solid-state relay Q5, the other end of the fifth capacitor C5 and the control end of the silicon controlled rectifier SCR1, the input end of the voltmeter is connected with the two ends of the fifth capacitor C5, and the output end of the voltmeter is connected with the embedded system controller M1 and is used for collecting the voltages at the two ends of the fifth capacitor C5.
4. The integrated pipeline demagnetizing and heating control system according to claim 3, wherein when the movable end e of the coil L is connected to the ac terminal b of the ac demagnetizing module, the embedded system controller M1 is configured to control the SCR1 to be turned on when the voltage on the fifth capacitor C5 reaches a preset value, and the high voltage on the fifth capacitor C5 performs LC damping oscillation through a discharge loop formed by the coil L, the SCR1 and the diode D7, so as to generate an ac demagnetizing magnetic field, and reduce the magnetic field intensity in the pipeline.
5. The integrated control system for pipe degaussing and heating according to claim 1, wherein the direct current degaussing module comprises an AC/DC module M3 and an AC/DC isolation module M4;
the embedded system controller M1 is connected with the control end of the AC/DC module M3, the input end of the AC/DC module M3 is connected with an AC power supply, the first output end of the AC/DC module M3 is connected with the first common terminal a, the second output end of the AC/DC module M3 is connected with the AC/DC isolation module M4, and the AC/DC isolation module M4 is connected with the second common terminal c.
6. The integrated pipeline degaussing and heating control system according to claim 5, wherein when the movable end e of the coil L is connected to the second common terminal c of the DC degaussing module and the intermediate frequency heating module, the embedded system controller M1 is configured to send a DC degaussing current magnitude control command to the AC/DC module M3, and the AC/DC module M3 outputs a corresponding DC current according to the DC degaussing current magnitude control command, and loads the DC current to the coil L after being isolated by the AC/DC isolation module M4, so as to generate a reverse magnetic field to cancel a residual magnetic field in the pipeline.
7. The integrated control system for demagnetizing and heating of pipeline according to claim 1, wherein the intermediate frequency heating module comprises a heating control module M2, a bridge rectifier module, a first IGBT module Q1, a second IGBT module Q2, a third IGBT module Q3, a fourth IGBT module Q4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a first resistor R1;
the input end of the bridge rectifier module is connected with a three-phase power supply, and the two output ends of the bridge rectifier module are respectively connected with a first serial branch formed by serially connecting a first IGBT module Q1 and a fourth IGBT module Q4 and a second serial branch formed by serially connecting a second IGBT module Q2 and a third IGBT module; the common ends of the first IGBT module Q1 and the fourth IGBT module Q4 are connected with the first common terminal a through the fourth capacitor C4, and the common ends of the second IGBT module Q2 and the third IGBT module Q3 are connected with the second common terminal C through the first resistor R1; the heating control module M2 is respectively connected with control ends of the first IGBT module Q1, the second IGBT module Q2, the third IGBT module Q3 and the fourth IGBT module Q4, and a first capacitor C1, a second capacitor C2 and a third capacitor C3 are connected in parallel between two output ends of the bridge rectifier module.
8. The integrated pipeline demagnetizing and heating control system according to claim 7, wherein when the movable end e of the coil L is connected to the second common terminal c, the embedded system controller M1 is configured to send a heating control command to the heating control module M2, the heating control module M2 generates a PWM signal according to the heating control command, and the PWM signal is used to control the first module formed by the first IGBT module Q1 and the third IGBT module Q3 to be alternately conducted with the second module formed by the second IGBT module Q2 and the fourth IGBT module Q4, so that the pipeline is circularly heated at an intermediate frequency.
9. The integrated control system for demagnetizing and heating pipelines according to any one of claims 1 to 8, further comprising a man-machine interaction module M5, wherein the man-machine interaction module M5 is connected to the embedded system controller M1.
10. A pipeline demagnetizing and heating integrated control method, characterized by being realized by the pipeline demagnetizing and heating integrated control system according to any one of claims 1 to 9, comprising:
when the movable end e of the coil L is connected with the alternating-current wiring terminal b of the alternating-current degaussing module, the embedded system controller M1 controls the alternating-current degaussing module to conduct alternating-current degaussing;
when the movable end e of the coil L is connected with the second common wiring terminal c of the direct-current demagnetizing module and the intermediate-frequency heating module, the embedded system controller M1 controls the direct-current demagnetizing module to perform direct-current demagnetizing and/or the intermediate-frequency heating module to perform intermediate-frequency heating.
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