CN115419835A - Natural gas station leakage detection equipment and detection implementation method - Google Patents

Natural gas station leakage detection equipment and detection implementation method Download PDF

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Publication number
CN115419835A
CN115419835A CN202211018883.XA CN202211018883A CN115419835A CN 115419835 A CN115419835 A CN 115419835A CN 202211018883 A CN202211018883 A CN 202211018883A CN 115419835 A CN115419835 A CN 115419835A
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China
Prior art keywords
laser
signal
natural gas
detection
leakage
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CN202211018883.XA
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Chinese (zh)
Inventor
韩文臣
李宇
韵琼琼
郅强
刘兆虎
李专
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China Resources Gas Investment China Co ltd
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China Resources Gas Investment China Co ltd
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Priority to CN202211018883.XA priority Critical patent/CN115419835A/en
Publication of CN115419835A publication Critical patent/CN115419835A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • F16M11/08—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • F16M11/10—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N2021/0106—General arrangement of respective parts
    • G01N2021/0112—Apparatus in one mechanical, optical or electronic block

Abstract

The invention discloses a natural gas station leakage detection device and a detection implementation method, which can remotely detect leakage of natural gas in real time, solve the technical problems that the conventional natural gas pipeline leakage detection device needs to be manually held for detection, is particularly labor-consuming, increases the workload of maintenance workers, has high labor intensity, is easy to fatigue, and causes low detection efficiency, and detect the leakage through a plurality of laser detection modules.

Description

Natural gas station leakage detection equipment and detection implementation method
Technical Field
The invention relates to the application field related to natural gas leakage detection, in particular to natural gas station leakage detection equipment and a detection implementation method.
Background
Along with the increasing perfection of the modern construction process of economic society, the continuously promoted substances and the mental culture living standard of the public require more effective and perfection of the construction of various infrastructures in cities, a natural gas pipeline is used as a main carrier for transmitting natural gas, the tightness of the pipeline has extremely strict requirements, once the tightness of the natural gas pipeline is poor, a leakage phenomenon occurs, under the condition that the natural gas is in contact reaction with various external variable factors, various large-scale malignant accidents can be caused, serious loss is caused, therefore, a maintenance worker needs to use a natural gas pipeline leakage detection device to regularly check the natural gas pipeline, the existing natural gas pipeline leakage detection device comprises a handheld machine body and a detection head, when in use, the detection head is close to the natural gas pipeline for detection, the detection head is mainly provided with an electrochemical sensor and a catalytic combustion sensor, the principle of the electrochemical sensor is that after external gas enters a gas detector, the gas enters the sensor, reaches electrodes through a Teflon film, different electrochemical reactions occur according to different gases, the natural gas is oxidized after reaching the electrodes, electrons flow from working electrodes through an external circuit, and form current, and the concentration of the current is in direct proportion to the concentration of the gas; the working principle of the catalytic combustion sensor is that the natural gas detector comprises a Wheatstone detection bridge circuit formed by two fixed resistors. When the mixed gas containing natural gas is diffused to the detecting element, flameless combustion is rapidly carried out, reaction heat is generated, the resistance value of the hot wire is increased, the electric bridge outputs a changing voltage signal, and the magnitude of the voltage signal is in direct proportion to the concentration of the combustible gas.
However, the existing natural gas pipeline leakage detection device needs to be manually held for detection, is extremely labor-consuming, increases the workload of maintenance workers, has high labor intensity, and causes low detection efficiency because the workers are easy to be tired.
Disclosure of Invention
Therefore, in order to solve the above-mentioned deficiencies, the invention provides a natural gas station leakage detection device and a detection implementation method, which can remotely detect natural gas leakage in real time, and solve the technical problems that the existing natural gas pipeline leakage detection device needs to be manually held for detection, is particularly labor-consuming, increases the workload of maintenance workers, has high labor intensity, is easy to fatigue for workers, and causes low detection efficiency, and the detection is performed by a plurality of laser detection modules.
The invention is realized in such a way, and the natural gas station leakage detection equipment is constructed and comprises a laser gas sensor, a data transmission system and a terminal, wherein the laser gas sensor is arranged on one side of a pipeline, and a natural reflecting surface for reflecting laser is arranged on one side of the pipeline, which is far away from the laser gas sensor;
the laser gas sensor comprises a laser detection module, a video monitoring module and a three-dimensional rotating holder, wherein the laser detection module and the video monitoring module are respectively arranged on two sides of the three-dimensional rotating holder.
The natural gas station leakage detection equipment and the detection implementation method can remotely detect the leakage of natural gas in real time, solve the technical problem that the conventional natural gas pipeline leakage detection device needs to be manually held for detection, are very labor-consuming, increase the workload of maintenance workers, have high labor intensity and are easy to fatigue, so that the detection efficiency is low, and detect the leakage through a plurality of laser detection modules, wherein the natural laser detection modules comprise a laser gas sensor, a data transmission system and a terminal, the laser gas sensor is arranged on one side of a pipeline, one side of the pipeline, which is far away from the laser gas sensor, is provided with a natural reflecting surface for reflecting laser light, have the advantages of high automation degree, high detection precision, high response speed, multiple application occasions and the like, can accurately detect the position of a leakage point and the concentration of gas leakage, simultaneously lighten the labor intensity of field operators, ensure the safety of natural gas transportation and storage, and ensure the safe, efficient and stable operation of a natural gas filling station.
The three-dimensional holder is used as a carrier of the laser detection module, and a monitoring area of a conical body can be formed through periodic laser scanning, so that leakage monitoring of the station pipeline equipment is completed.
The laser detection module comprises a laser receiving and transmitting unit, a signal control acquisition processing unit and a main control and data transmission unit, wherein the laser receiving and transmitting unit is kept connected with the signal control acquisition unit, and the main control and data transmission unit is kept connected with the signal control processing acquisition unit.
The laser transceiving unit comprises a detector, a laser and a lens.
The laser emits the modulated laser through the lens, the natural reflecting surface changes the vertical light into scattered light, and the scattered light is condensed by the lens again and then received by the detector;
the signal control acquisition processing unit comprises a signal detection circuit and a laser control circuit, the signal detection circuit is connected with the detector, and the laser control circuit is connected with the laser.
The signal control acquisition processing unit comprises a laser control circuit and a signal detection circuit, wherein the laser control circuit modulates emitted laser through temperature control and current regulation, and the signal detection circuit extracts a reflected laser harmonic signal;
the main control and data transmission unit selects a singlechip.
The main structure of the main control and data transmission unit is a single chip microcomputer, and the main function of the main control and data transmission unit is to send instructions to the signal control acquisition and processing unit, receive signals and transmit external data.
The signal detection circuit comprises a signal input circuit, a signal amplification circuit and a signal output circuit, wherein the signal input circuit is connected with the detector and the signal amplification circuit, and the signal output circuit is connected with the signal amplification circuit and the main control and data transmission unit.
Because the intensity of the signals collected from the field is small, the signals need to be amplified by a signal amplifying circuit, and the amplified signals are transmitted to a signal collecting unit for processing.
The data transmission system comprises a first optical transceiver and a second optical transceiver, wherein the first optical transceiver and the second optical transceiver are kept connected through an optical cable.
The open-air process area of a common natural gas station is far away from a station control room (or a central control room), and the Ethernet signal transmission distance is short, so that a signal integration mode is adopted, signals are converted into optical signals through an optical transceiver, the optical signals are transmitted through an optical fiber, and the signals are analyzed through the optical transceiver on one side of a terminal.
The terminal comprises a controller, an alarm, a signal input device display and a storage unit, wherein the alarm, the signal input device display and the storage unit are all connected with the controller.
When the laser gas sensor transmits a detected gas concentration signal to the terminal through the data transmission system, the display screen displays the concentration value, and when the concentration exceeds a set value, the industrial personal computer controls the sound-light alarm device to start alarming. When the laser gas sensor transmits a detected gas concentration signal to the terminal through the data transmission system, the display screen displays the concentration value, and when the concentration exceeds a set value, the industrial personal computer controls the sound-light alarm device to start alarming.
The three-dimensional rotating tripod head is of a double-barrel structure, the two sides of the three-dimensional rotating tripod head are respectively provided with a laser detection module video monitoring module, and the two modules rotate synchronously when working, so that the real-time correspondence between detection data and monitoring pictures is ensured; the three-dimensional rotating holder is used as a carrier of the laser detection module, and a monitoring area of a conical body can be formed through periodic laser scanning, so that leakage monitoring of station pipeline equipment is completed;
the three-dimensional rotating tripod head selects an explosion-proof integrated omnibearing speed-changing tripod head suitable for explosion-proof occasions of gas explosion-proof areas I and II and dust explosion-proof areas A20-A22, meets the triple lightning protection requirements of power supply, signal and video, and meets the use requirement of a natural gas station; the cradle head can realize continuous rotation of 360 degrees horizontally and 180 degrees vertically, meanwhile, the setting of preset positions can be completed according to rear-end action instructions, each cradle head can independently set 128 preset positions, and the sensor cruising path can be determined through the setting of the preset positions;
the detection radius of the laser detection module is 50m, and the laser detection module can be horizontally rotated to achieve the level of about 7800m 2 Monitoring natural gas leakage in an area region, wherein 2-8 natural gas stations are arranged in a common natural gas station to realize covering monitoring of a process field area; the response time of detection does not exceed 0.1s, and real-time monitoring with almost no delay can be realized.
The data transmission system is responsible for the transmission of signals between the front-end laser gas sensor and the rear-end early warning monitoring terminal; wherein the signals transmitted from the front sensor to the back sensor are: the concentration data signal of the laser detection module comprises light intensity data and natural gas integral concentration data; the tripod head action signal returned by the three-dimensional rotating tripod head in real time comprises a horizontal angle, a vertical angle, a preset bit number and a real-time value of the rotating speed; a process field video signal collected by a video monitoring module; the terminal controls the operation of the sensor by sending an instruction signal to the front-end sensor, and the method comprises the following steps: the control signal of the laser detection module is used for controlling the switch of the laser detection indicator lamp; the command signal of the three-dimensional rotating holder is used for setting the cruising speed and the preset position coordinate; and the control signal of the video monitoring module is used for controlling the functions of zooming, photographing and the like of the camera.
The implementation method for detecting natural gas leakage by using natural gas station leakage detection equipment comprises the following steps;
step 1, starting up self-checking system equipment;
step 2, starting a laser gas sensor, operating the system, lighting a laser in a laser detection module, starting a video monitoring module, and driving the laser detection module and the video monitoring module to move by a three-dimensional rotating holder;
step 3, laser emitted by the laser penetrates through a leakage area, a lens focuses emitted light, a detector receives an optical signal, a video monitoring module records a field video, and the video signal is transmitted to a terminal to be displayed and stored;
step 4, if natural gas leaks and the light intensity returned by the laser becomes weak, the signal detection circuit detects the returned light intensity signal and transmits the returned light intensity signal to the single chip microcomputer for processing, the processed signal is transmitted to a controller of the terminal through the data transmission system for analysis and judgment, the leakage concentration is displayed on the display, the data is stored in the storage unit, meanwhile, the alarm is started, and the audible and visual alarm is started;
step 5, field personnel process leakage points;
and 6, resetting the system.
The invention has the following advantages: the invention provides a natural gas station leakage detection device and a detection implementation method, which can remotely detect natural gas leakage in real time, solve the technical problems that the conventional natural gas pipeline leakage detection device needs to be manually held for detection, is particularly labor-consuming, increases the workload of maintenance workers, has high labor intensity, is easy to fatigue, and causes low detection efficiency, and carry out detection through a plurality of laser detection modules. When the natural gas station leakage detection equipment is implemented, the natural gas station leakage detection equipment comprises a laser gas sensor 9, a data transmission system 2 and a terminal 3, wherein the laser gas sensor 9 is arranged on one side of a pipeline 8, and a natural reflecting surface 7 for reflecting laser is arranged on one side of the pipeline 8, which is far away from the laser gas sensor 9; the laser gas sensor 9 comprises a laser detection module 1, a video monitoring module 4 and a three-dimensional rotating holder 5, wherein the laser detection module 1 and the video monitoring module 4 are respectively arranged at two sides of the three-dimensional rotating holder 5.
The improved three-dimensional rotating tripod head 5 is of a double-barrel structure, the laser detection module 1 and the video monitoring module 4 are respectively arranged on two sides of the improved three-dimensional rotating tripod head and synchronously rotate when working, and real-time correspondence between detection data and monitoring pictures is guaranteed. The sensor is generally installed in a process area in a vertical rod mode, the three-dimensional holder is used as a carrier of the laser detection module, a monitoring area of a conical body can be formed through periodic laser scanning, and leakage monitoring of station pipeline equipment is completed.
In the implementation process, the three-dimensional rotating pan-tilt adopts an explosion-proof integrated all-dimensional variable-speed pan-tilt suitable for explosion-proof occasions of a gas explosion-proof area I, an area II and a dust explosion-proof area A20-A22, meets the triple lightning protection requirements of a power supply, a signal and a video, and meets the use requirement of a natural gas station. The cloud platform can realize 360 degrees, the vertical 180 degrees continuous rotations of level, can accomplish the setting of presetting bit according to rear end action command simultaneously, and every cloud platform can independently set up 128 presetting bits, can confirm sensor path of cruising through the setting of presetting bit.
The detection radius of the laser detection module 1 is 50m, and the laser detection module can horizontally rotate to reach about 7800m 2 Monitoring natural gas leakage in an area region, wherein 2-8 natural gas stations are arranged in a common natural gas station to realize covering monitoring of a process field area; the response time of detection does not exceed 0.1s, and real-time monitoring with almost no delay can be realized.
And the data transmission system is responsible for the transmission of signals between the front-end laser gas sensor and the rear-end early warning monitoring terminal. Wherein the signals transmitted from the front sensor to the back sensor are: the concentration data signal of the laser detection module comprises light intensity data and natural gas integral concentration data; the tripod head action signal returned by the three-dimensional rotating tripod head in real time comprises a horizontal angle, a vertical angle, a preset bit number and a real-time value of the rotating speed; and the video monitoring module is used for acquiring process field video signals. The terminal controls the operation of the sensor by sending an instruction signal to the front-end sensor, and the method comprises the following steps: the control signal of the laser detection module is used for controlling the switch of the laser detection indicator lamp; the command signal of the three-dimensional rotating holder is used for setting the cruising speed and the preset position coordinate; and the control signal of the video monitoring module is used for controlling the functions of zooming, photographing and the like of the camera.
In conclusion, the invention has the advantages of high automation degree, high detection precision, high response speed, multiple applicable occasions and the like, can accurately detect the position of a leakage point and the gas leakage concentration, simultaneously lightens the labor intensity of field operators, ensures the safety of natural gas transportation and storage, and ensures the safe, efficient and stable operation of a natural gas filling station.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a laser gas sensor;
FIG. 3 is a schematic structural diagram of a laser detection module;
FIG. 4 is a schematic diagram of a signal detection circuit;
FIG. 5 is a schematic diagram of a data transmission system;
fig. 6 is a schematic configuration diagram of a terminal;
fig. 7 is a schematic diagram of the principle of the present invention.
Wherein: 1. a laser gas sensor; 110. a laser signal transceiving unit; 111. a detector; 112. a laser; 120. a signal control acquisition processing unit; 121. a signal detection circuit; 121-1, a signal input circuit; 121-2, a signal amplification circuit; 121-3, a signal output circuit; 122. a laser control circuit; 130. a main control and data transmission unit; 2. a data transmission system; 2-1, a first optical transceiver; 2-2, a second optical transceiver; 3. a terminal; 3-1, an alarm; 3-2, a signal input device; 3-3, a display; 3-4, a storage unit; 3-5, a controller; 4. a video monitoring module; 5. a three-dimensional rotating holder; 6. a lens; 7. a natural reflecting surface; 8. a pipeline; 9. a laser gas sensor.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 7, and the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a natural gas station leakage detection device through improvement, which comprises a laser gas sensor 9, a data transmission system 2 and a terminal 3, wherein the laser gas sensor 9 is arranged on one side of a pipeline 8, and a natural reflecting surface 7 for reflecting laser is arranged on one side of the pipeline 8, which is far away from the laser gas sensor 9;
the laser gas sensor 9 comprises a laser detection module 1, a video monitoring module 4 and a three-dimensional rotating holder 5, wherein the laser detection module 1 and the video monitoring module 4 are respectively arranged at two sides of the three-dimensional rotating holder 5.
The three-dimensional rotating cloud deck 5 is of a double-drum structure, the laser detection module 1 and the video monitoring module 4 are respectively installed on two sides of the three-dimensional rotating cloud deck and synchronously rotate when working, and real-time correspondence between detection data and monitoring pictures is guaranteed. The sensor is generally installed in a process area in a vertical rod mode, the three-dimensional holder is used as a carrier of the laser detection module, a monitoring area of a conical body can be formed through periodic laser scanning, and leakage monitoring of station pipeline equipment is completed.
The three-dimensional rotating tripod head selects an explosion-proof integrated omnibearing speed-changing tripod head suitable for explosion-proof occasions of gas explosion-proof areas I and II and dust explosion-proof areas A20-A22, meets the triple lightning protection requirements of power supply, signal and video, and meets the use requirement of a natural gas station. The cloud platform can realize 360 degrees, the vertical 180 degrees continuous rotations of level, can accomplish the setting of presetting bit according to rear end action command simultaneously, and every cloud platform can independently set up 128 presetting bits, can confirm sensor path of cruising through the setting of presetting bit.
The detection radius of the laser detection module 1 is 50m, and the laser detection module can horizontally rotate to reach about 7800m 2 Monitoring natural gas leakage in an area region, wherein 2-8 natural gas stations are arranged in a common natural gas station to realize covering monitoring of a process field area; the response time of detection does not exceed 0.1s, and real-time monitoring with almost no delay can be realized.
The data transmission system is responsible for the transmission of signals between the front-end laser gas sensor and the rear-end early warning monitoring terminal (fig. 5). Wherein the signals transmitted from the front sensor to the back sensor are: the concentration data signal of the laser detection module comprises light intensity data and natural gas integral concentration data; the tripod head action signal returned by the three-dimensional rotating tripod head in real time comprises a horizontal angle, a vertical angle, a preset bit number and a real-time value of the rotating speed; and the video monitoring module is used for acquiring process field video signals. The terminal controls the operation of the sensor by sending an instruction signal to the front-end sensor, and the method comprises the following steps: the control signal of the laser detection module is used for controlling the switch of the laser detection indicator lamp; the command signal of the three-dimensional rotating holder is used for setting a cruising speed and preset position coordinates; and the control signal of the video monitoring module is used for controlling the functions of zooming, photographing and the like of the camera.
The laser detection module 1 comprises a laser transceiving unit 110, a signal control acquisition processing unit 120 and a master control and data transmission unit 130, wherein the laser transceiving unit 110 is connected with the signal control acquisition unit 120, and the master control and data transmission unit 130 is connected with the signal control acquisition processing unit 120.
The laser transceiver unit 110 includes a detector 111, a laser 112, and a lens 6.
The laser 112 emits the modulated laser through the lens 6, the natural reflecting surface changes the vertical light into scattered light, and the scattered light is condensed through the lens again and then received by the detector 111;
the signal control acquisition processing unit 120 includes a signal detection circuit 121 and a laser control circuit 122, the signal detection circuit 121 is connected with the detector 111, and the laser control circuit 122 is connected with the laser 112.
The signal control acquisition processing unit 120 comprises a laser control circuit 122 and a signal detection circuit 121, wherein the laser control circuit realizes the modulation of emitted laser through temperature control and current regulation, and the signal detection circuit extracts a reflected laser harmonic signal;
the main control and data transmission unit 130 selects a single chip microcomputer.
The main structure of the main control and data transmission unit is a single chip microcomputer, and the main function of the main control and data transmission unit is to send instructions to the signal control acquisition and processing unit, receive signals and transmit external data.
The signal detection circuit 121 includes a signal input circuit 121-1, a signal amplification circuit 121-2, and a signal output circuit 121-3, the signal input circuit 121-1 is connected to the detector 111 and the signal amplification circuit 121-2, and the signal output circuit 121-3 is connected to the signal amplification circuit 121-2 and the main control and data transmission unit 130.
Because the intensity of the signal collected from the field is small, the signal needs to be amplified by the signal amplifying circuit 121-2, and the amplified signal is transmitted to the signal collecting unit for processing.
The data transmission system 2 comprises a first optical transceiver 2-4 and a second optical transceiver 2-2, and the first optical transceiver 2-4 and the second optical transceiver 2-2 are connected through an optical cable.
In the system, data signals and video monitoring signals related to the laser detection module and the three-dimensional rotating holder adopt an Ethernet transmission protocol. The open-air process area of a common natural gas station is far away from a station control room (or a central control room), and the Ethernet signal transmission distance is short, so that a signal integration mode is adopted, signals are converted into optical signals through an optical transceiver, the optical signals are transmitted through an optical fiber, and the signals are analyzed through the optical transceiver on one side of a terminal.
The terminal 3 comprises a controller 3-5, an alarm 3-1, a signal input device 3-2, a display 3-3 and a storage unit 3-4, wherein the alarm 3-1, the signal input device 3-2, the display 3-3 and the storage unit 3-4 are all connected with the controller 3-5.
When the laser gas sensor 9 transmits a detected gas concentration signal to the terminal 3 through the data transmission system 2, the display screen 3-3 displays a concentration value, and when the concentration exceeds a set value, the industrial personal computer controls the sound-light alarm device to start alarm.
The implementation method for detecting natural gas leakage by using natural gas station leakage detection equipment comprises the following steps;
step 1, starting up self-checking system equipment;
step 2, starting the laser gas sensor 9, operating the system, lighting a laser 112 in the laser detection module 1, starting the video monitoring module 4, and driving the laser detection module 1 and the video monitoring module 4 to move by the three-dimensional rotating holder;
step 3, laser emitted by the laser 27 penetrates a leakage area, the lens 6 focuses emitted light, the detector 111 receives a light signal, the video monitoring module 4 records a field video, and transmits the video signal to the terminal 3 for displaying and storing;
step 4, if natural gas leaks and the light intensity returned by the laser becomes weak, the signal detection circuit 121 detects the returned light intensity signal and transmits the returned light intensity signal to the single chip microcomputer 130 for processing, the processed signal is transmitted to the controller 3-5 of the terminal 3 through the data transmission system 2 for analysis and judgment, the leakage concentration is displayed on the display 3-3, the data is stored in the storage unit 3-4, meanwhile, the alarm 3-1 is started, and the audible and visual alarm is started;
step 5, field personnel process leakage points;
and 6, resetting the system.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A natural gas station leakage detection device is characterized in that; the device comprises a laser gas sensor (9), a data transmission system (2) and a terminal (3), wherein the laser gas sensor (9) is arranged on one side of a pipeline (8), and a natural reflecting surface (7) for reflecting laser is arranged on one side, far away from the laser gas sensor (9), of the pipeline (8);
the laser gas sensor (9) comprises a laser detection module (1), a video monitoring module (4) and a three-dimensional rotating tripod head (5), wherein the laser detection module (1) and the video monitoring module (4) are respectively arranged on two sides of the three-dimensional rotating tripod head (5).
2. The natural gas station leak detection apparatus according to claim 1, wherein; the laser detection module (1) comprises a laser receiving and transmitting unit (110), a signal control acquisition processing unit (120) and a main control and data transmission unit (130), wherein the laser receiving and transmitting unit (110) is kept connected with the signal control acquisition unit (120), and the main control and data transmission unit (130) is kept connected with the signal control processing acquisition unit (120).
3. The natural gas station leakage detection apparatus according to claim 2, wherein; the laser transceiver unit (110) comprises a detector (111), a laser (112) and a lens (6).
4. The natural gas station leak detection apparatus according to claim 2, wherein; the signal control acquisition processing unit (120) comprises a signal detection circuit (121) and a laser control circuit (122), wherein the signal detection circuit (121) is connected with the detector (111) in a maintaining mode, and the laser control circuit (122) is connected with the laser (112) in a maintaining mode.
5. The natural gas station leak detection apparatus according to claim 2, wherein; the main control and data transmission unit (130) selects a single chip microcomputer.
6. The natural gas station leak detection apparatus according to claim 4, wherein; the signal detection circuit (121) comprises a signal input circuit (121-1), a signal amplification circuit (121-2) and a signal output circuit (121-3), wherein the signal input circuit (121-1) is connected with the detector (111) and the signal amplification circuit (121-2) in a maintaining mode, and the signal output circuit (121-3) is connected with the signal amplification circuit (121-2) and the main control and data transmission unit (130) in a maintaining mode.
7. The natural gas station leak detection apparatus according to claim 1, wherein; the data transmission system (2) comprises a first optical transceiver (2-4) and a second optical transceiver (2-2), wherein the first optical transceiver (2-4) and the second optical transceiver (2-2) are kept connected through an optical cable.
8. The natural gas station leakage detection apparatus according to claim 1, wherein; the terminal (3) comprises a controller (3-5), an alarm (3-1), a signal input device (3-2), a display (3-3) and a storage unit (3-4), wherein the alarm (3-1), the signal input device (3-2), the display (3-3) and the storage unit (3-4) are all connected with the controller (3-5); when the laser gas sensor (9) transmits a detected gas concentration signal to the terminal (3) through the data transmission system (2), the display screen (3-3) displays a concentration value, and when the concentration exceeds a set value, the industrial personal computer controls the acousto-optic alarm device to start alarming.
9. The natural gas station leak detection apparatus according to claim 1, wherein; the three-dimensional rotating tripod head (5) is of a double-drum structure, the two sides of the three-dimensional rotating tripod head are respectively provided with the laser detection module (1) and the video monitoring module (4), and the two modules rotate synchronously when working, so that the real-time correspondence between detection data and a monitoring picture is ensured; the three-dimensional rotating holder is used as a carrier of the laser detection module, and a monitoring area of a conical body can be formed through periodic laser scanning, so that leakage monitoring of station pipeline equipment is completed;
the three-dimensional rotating pan-tilt (5) selects an explosion-proof integrated all-dimensional variable-speed pan-tilt suitable for explosion-proof occasions of gas explosion-proof areas I and II and dust explosion-proof areas A20-A22, meets the triple lightning protection requirements of power supply, signal and video, and meets the use requirements of a natural gas station; the cradle head can realize continuous rotation of 360 degrees horizontally and 180 degrees vertically, meanwhile, the setting of preset positions can be completed according to rear-end action instructions, each cradle head can independently set 128 preset positions, and the sensor cruising path can be determined through the setting of the preset positions;
the detection radius of the laser detection module (1) is 50m, and the laser detection module can horizontally rotate to achieve about 7800m 2 The natural gas leakage monitoring of the area region, 2-8 natural gas stations are arranged on a common natural gas station, and the covering monitoring of a process field area can be realized; the response time of detection does not exceed 0.1s, and real-time monitoring with almost no delay can be realized.
The data transmission system (2) is responsible for the transmission of signals between the front-end laser gas sensor and the rear-end early warning monitoring terminal; wherein the signals transmitted from the front sensor to the back sensor are: the concentration data signal of the laser detection module comprises light intensity data and natural gas integral concentration data; the tripod head action signal returned by the three-dimensional rotating tripod head in real time comprises a horizontal angle, a vertical angle, a preset bit number and a real-time value of the rotating speed; a process field video signal collected by a video monitoring module; the terminal (3) controls the operation of the sensor by sending an instruction signal to the front-end sensor, and the method comprises the following steps: the control signal of the laser detection module is used for controlling the switch of the laser detection indicator lamp; the command signal of the three-dimensional rotating holder is used for setting the cruising speed and the preset position coordinate; and the control signal of the video monitoring module is used for controlling the functions of zooming, photographing and the like of the camera.
10. The detection implementation method of the natural gas station leakage detection equipment according to claim 1, characterized by comprising the steps of; the method comprises the following steps of;
step 1, power-on self-test of system equipment;
step 2, starting a laser gas sensor (9), operating the system, lighting a laser (112) in a laser detection module (1), starting a video monitoring module (4), and driving the laser detection module (1) and the video monitoring module (4) to move by a three-dimensional rotating cradle head;
step 3, laser emitted by the laser (27) penetrates a leakage area, the lens (6) focuses the emitted light, the detector (111) receives a light signal, the video monitoring module (4) records a field video, and transmits the video signal to the terminal (3) for displaying and storing;
step 4, if natural gas leaks and the light intensity returned by the laser becomes weak, a signal detection circuit (121) detects a returned light intensity signal and transmits the returned light intensity signal to a single chip microcomputer (130) for processing, the processed signal is transmitted to a controller (3-5) of a terminal (3) through a data transmission system (2) for analysis and judgment, the obtained leakage concentration is displayed on a display (3-3) and data is stored in a storage unit (3-4), and meanwhile, an alarm (3-1) is started to start an audible and visual alarm;
step 5, field personnel process leakage points;
and 6, resetting the system.
CN202211018883.XA 2022-08-24 2022-08-24 Natural gas station leakage detection equipment and detection implementation method Pending CN115419835A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116625582A (en) * 2023-07-24 2023-08-22 上海安宸信息科技有限公司 Movable gas leakage monitoring system for petroleum and petrochemical gas field station

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116625582A (en) * 2023-07-24 2023-08-22 上海安宸信息科技有限公司 Movable gas leakage monitoring system for petroleum and petrochemical gas field station
CN116625582B (en) * 2023-07-24 2023-09-19 上海安宸信息科技有限公司 Movable gas leakage monitoring system for petroleum and petrochemical gas field station

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