CN213333667U

CN213333667U - Visual detection integrated device in LNG storage tank

Info

Publication number: CN213333667U
Application number: CN202022353026.8U
Authority: CN
Inventors: 付子航; 侯海龙; 王秀林; 杨玉霞; 杨宏伟; 姚辉超; 安东雨; 段品佳; 邢楠; 吴健宏
Original assignee: CNOOC Gas and Power Group Co Ltd
Current assignee: CNOOC Gas and Power Group Co Ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-06-01
Anticipated expiration: 2030-10-21

Abstract

The utility model relates to a visual detection integrated device in LNG storage tank, the tank deck of the LNG storage tank that it includes reserves the mounting hole, and the cable device is installed outside the tank deck of LNG storage tank, and the first end of cable device is set up in LNG storage tank through the mounting hole to be provided with the magnetism fixed block at the first end tip of cable device, the magnetism fixed block adsorbs at the tank body bottom of LNG storage tank; the second end of the cable device is connected with a power supply and control system arranged outside the LNG storage tank; be located the LNG storage tank, be provided with detection device on the cable device, realize the inside visual detection of LNG storage tank by detection device. The utility model discloses can carry out three-dimensional laser imaging and visible light formation of image to the storage tank is inside under the circumstances of not stopping, carry out audio-visual observation and prison to the storage tank internal conditions and detect, observe the deflection that temperature stress leads to in the storage tank, observe directly perceivedly to the inside corruption condition of storage tank, observe the ice deposition of storage tank etc..

Description

Visual detection integrated device in LNG storage tank

Technical Field

The utility model relates to an ultra-low temperature medium storage space monitoring technology field especially is about an inside visual detection integrated device of LNG storage tank.

Background

An LNG (liquefied natural gas) storage tank is a core facility for LNG storage and transportation, and has the characteristics of large storage space, low medium temperature, expensive construction and difficult overhaul. The LNG storage tank is complex to build, and the inner tank is a large-scale steel storage tank formed by welding special steel plates resistant to ultralow temperature. Besides, the inner tank also comprises facilities and equipment such as a discharge pipeline, a pump well, a low-pressure pump and the like. The working medium of the LNG storage tank is liquefied natural gas stored at normal pressure, the storage temperature is about-165 ℃, the material constructed at normal temperature can generate temperature shrinkage stress at ultralow temperature to deform, but at present, no detection technology is available for monitoring whether the deformation amount applied in the storage tank in the precooling process exceeds the design parameters, and the design and construction parameters cannot be verified. On the other hand, after the weld joint of the storage tank is subjected to hydrostatic test and later-stage construction, corrosion can inevitably occur, and the corrosion of the internal facilities of the storage tank cannot be regularly checked after the storage tank is put into operation. Finally, the storage tank is used as an internal pressure container of the LNG receiving station, and the storage tank is regularly checked according to special equipment checking standard TSG R7004 pressure container supervision and inspection rules to ensure the intact state of the facility.

At present, the existing patent application has an acoustic emission internal detection technology for an oil product storage tank, and has no internal detection technology for an LNG storage tank. Therefore, there is no solution to the above problems. Therefore, further research on the detection and monitoring equipment and method technology in the LNG storage tank is necessary.

Disclosure of Invention

To the above problem, the utility model aims at providing an inside visual detection integrated device of LNG storage tank, it can carry out three-dimensional laser imaging and visible light formation of image to storage tank inside under the circumstances of not stopping, carries out audio-visual observation and prison to the storage tank internal conditions and detects, observes the deflection that temperature stress leads to in the storage tank, carries out audio-visual observation to the inside corrosion conditions of storage tank, observes the ice deposition volume etc. of storage tank.

In order to achieve the purpose, the utility model adopts the following technical proposal: the utility model provides an inside visual detection integrated device of LNG storage tank, it includes: the device comprises an LNG storage tank, a power supply and control system, a cable device, a detection device and a magnetic fixing block; a mounting hole is reserved in the tank top of the LNG storage tank, the cable device is mounted outside the tank top of the LNG storage tank, the first end of the cable device is arranged in the LNG storage tank through the mounting hole, the end part of the first end of the cable device is provided with the magnetic fixing block, and the magnetic fixing block is adsorbed at the bottom of the tank body of the LNG storage tank; the second end of the cable device is connected with the power supply and control system arranged outside the LNG storage tank; and the cable device is provided with the detection device, and the detection device realizes the visual detection of the interior of the LNG storage tank.

Further, the cable device comprises a power supply cable, a signal cable, a steel strand cable and a cable shaft; one end of the power supply and signal cable is connected with the detection device, and the other end of the power supply and signal cable is connected with the power supply and control system through the cable shaft; the first end of the steel strand cable is connected with the magnetic fixing block, and the second end of the steel strand cable is connected with the cable shaft arranged outside the LNG tank top through the mounting hole.

Further, the power and signal cable comprises a cable housing, a cold insulation layer, a signal cable and a power supply cable; the cold insulation layer is arranged on the inner side of the cable shell, and the signal cable and the power supply cable are positioned in the cold insulation layer; the signal cable and the power supply cable are connected with the detection device and used for supplying power to the detection device and transmitting the signals detected by the detection device to the power supply and control system through the signal cable.

Further, the detection device comprises a sealed shell, a back hole, a mounting seat, a camera device, a laser imaging device and an illuminating device, wherein the mounting seat, the camera device, the laser imaging device and the illuminating device are arranged in the sealed shell; the camera shooting equipment, the laser imaging equipment and the illuminating equipment are arranged on the mounting seat through a rotating shaft, the rotating shaft is driven to rotate by a motor arranged in the sealed shell, and the motor is connected with the power supply and control system through the power supply and signal cable; the back hole is formed in the back of the sealing shell, and the first end of the steel strand cable penetrates through the back hole to be connected with the magnetic fixing block; the power supply and signal cable penetrates through the sealing shell to be connected with the camera shooting equipment, the laser imaging equipment and the lighting equipment to supply power to all parts, and image signals collected by the camera shooting equipment and the laser imaging equipment are transmitted to the power supply and control system through the signal cable.

Further, the lighting equipment adopts an LED lighting facility, and the color temperature of a light source is 3000K or 6000K; the rated service life of the lighting facility is more than or equal to 5000 hours; the central illumination should be equal to or greater than 33000 lx.

Further, the resolution of the image pickup apparatus is 200 ten thousand pixels or more; the sensitivity is not less than 0.21ux @ f 1.4; the focusing mode is an automatic focusing mode or a manual focusing mode; the zooming range is not less than 30:1, and the zooming mode is manual control or electric control; the image pickup apparatus withstands an applied air pressure of not less than 50 bar.

Furthermore, the sealing shell is a sealing cavity body made of transparent materials of special glass or special resin materials, and the sealing cavity body is in a vacuum-pumping state.

Further, the special glass or the special resin is an ultralow-temperature material which can endure the temperature below-165 ℃.

Further, the power supply and control system comprises a mobile power supply facility and an industrial personal computer; the power supply facility is used for supplying power to the industrial personal computer and the detection device; the industrial control computer controls the detection device which extends into the LNG storage tank.

The utility model discloses owing to take above technical scheme, it has following advantage: 1. the utility model is used for inside visual formation of image of seal chamber, inside dimensional measurement, internal plant facility corrosion status/welding seam state/defect/crack and structural deformation observation, leakage monitoring, the temperature distribution observation that conventional observation devices such as LNG storage tank inside or LNG transport ship warehouse can't get into can also detect the condition of LNG storage tank or the inside ice that deposits of transport ship etc. simultaneously. The utility model discloses can realize carrying out the processing analysis in will detecting data transmission to the outside control system of enclosure through the cable to inside formation of image, the detection of enclosure. 2. The utility model discloses a detection data can survey and know LNG storage tank inner wall, LNG transport ship inner wall and in the jar, the corrosion conditions, the welding seam state of under-deck facility, whether have the condition of sinking ice of leakage, bottom. 3. The utility model discloses can carry out three-dimensional laser imaging and visible light formation of image to the storage tank is inside under the circumstances of not stopping, carry out audio-visual observation and prison to the storage tank internal conditions and detect, observe the deflection that temperature stress leads to in the storage tank, observe directly perceivedly to the inside corruption condition of storage tank, observe the ice deposition of storage tank etc..

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a front view of the probe apparatus.

Fig. 3 is a side view of the probe apparatus.

Fig. 4 is a cross-sectional view of power and signal cables.

Reference numerals: 1. LNG storage tank, 2, power supply and control system, 3, cable device, 4, detection device sealing device, 5, magnetism fixed block, 6, camera equipment, 7, laser imaging equipment, 8, lighting apparatus, 9, sealing device back hole, 10, power supply and signal cable, 11, cable shell, 12, cold insulation layer, 13, signal cable, 14, power supply cable.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

As shown in fig. 1-4, the utility model provides an inside visual detection integrated device of LNG storage tank, it includes LNG storage tank 1, power supply and control system 2, cable device 3, detection device 4 and magnetism fixed block 5.

A mounting hole is reserved in the tank top of the LNG storage tank 1, the cable device 3 is mounted outside the tank top of the LNG storage tank 1, a first end of the cable device 3 is arranged in the LNG storage tank 1 through the mounting hole, a magnetic fixing block 5 is arranged at the end part of the first end of the cable device 3, and the magnetic fixing block 5 is adsorbed at the bottom of the tank body of the LNG storage tank 1; the second end of the cable arrangement 3 is connected to a power supply and control system 2 arranged outside the LNG storage tank 1. Be located LNG storage tank 1, be provided with detection device 4 on cable device 3, realize the inside visual detection of LNG storage tank by detection device 4.

In the above embodiment, the cable device 3 includes the power supply and signal cable 10, the steel strand cable, and the cable shaft. One end of the power supply and signal cable 10 is connected with the detection device 4, and the other end is connected with the power supply and control system 2 through a cable shaft. The first end of steel strand wires cable is connected with magnetism fixed block 5, and the second end of steel strand wires cable is connected with the cable axle that sets up in the LNG tank deck outside through the reservation mounting hole on the LNG tank deck.

As shown in fig. 4, the power supply and signal cable 10 includes a cable housing 11, a cold insulation layer 12, a signal cable 13, and a power supply cable 14. A cold insulation layer 12 is arranged on the inner side of the cable shell 11, and the signal cable 13 and the power supply cable 14 are positioned in the cold insulation layer 12; and the signal cable 13 and the power supply cable 14 are connected with the detection device 4 and used for supplying power to the detection device 4 and transmitting the signal detected by the detection device 4 to the power supply and control system 2 through the signal cable 13.

Preferably, the steel strand cable is made of phi 25 stainless steel strands.

In the above embodiment, as shown in fig. 2 and 3, the detection device 4 includes a sealed housing and a back hole 9, and a mounting seat, an image pickup apparatus 6, a laser imaging apparatus 7, and an illumination apparatus 8 disposed in the sealed housing. The camera device 6, the laser imaging device 7 and the lighting device 8 are arranged on the mounting seat through rotating shafts, the rotating shafts are driven to rotate by motors arranged in the sealing shell, the motors are connected with the power supply and control system 2 through power supply and signal cables 10, the power supply and control system 2 controls the motors to act, the rotating shafts are driven to rotate in the horizontal direction to control the shooting angles (from 45 degrees to-315 degrees) of the camera device 6 and the laser imaging device 7, and the detection in the circumferential direction is achieved by controlling the horizontal rotation of the detection device 4. Back hole 9 sets up at seal housing's back, and the first end of steel strand wires cable passes back hole 9 and is connected with magnetism fixed block 5, prevents by the steel strand wires cable that detection device 4 from flowing along with jar interior LNG, guarantees detection device 4's vertical direction.

Wherein, the power supply and signal cable 10 passes through the sealed shell to be connected with the camera device 6, the laser imaging device 7 and the lighting device 8 so as to supply power to all the components; the image signals collected by the camera device 6 and the laser imaging device 7 are transmitted to the power supply and control system 2 via the signal cable 13.

Preferably, the lighting device 8 can adopt an LED lighting facility, and the color temperature of a light source is 3000K or 6000K. The rated service life of the lighting facility is more than or equal to 5000 hours; the brightness of the lighting facility is continuously adjustable; the central illumination is more than or equal to 33000 lx; the maximum downward extending depth is more than or equal to 10 meters.

Preferably, the resolution of the image pickup apparatus 6 is 200 ten thousand pixels or more; the sensitivity is not less than 0.21ux @ f 1.4; the focusing mode of the image pickup device 6 can be an automatic focusing mode or a manual focusing mode; the zooming range is not less than 30:1, and the zooming mode can be manual control or electric control; the image pickup device 6 withstands an applied air pressure of not less than 50 bar.

Preferably, the laser imaging device 7 can generate three-dimensional imaging for the space in the storage tank, and adopts a parallax scanning mode at a short distance and a laser phase scanning mode at a long distance; the size of a target is measured in a parallax scanning mode to be not less than 4 meters, and the measurement precision is not less than 0.2 mm; the measuring distance of the phase scanning mode is not less than 30 meters, and the measuring precision is not more than +/-3 mm.

Preferably, the sealed housing is a sealed cavity formed by transparent materials such as special glass or special resin materials, and the sealed cavity is in a vacuum-pumping state. The special glass or special resin is an ultralow temperature material which can endure the temperature below-165 ℃.

In the above embodiments, the power supply and control system 2 includes a mobile power supply facility and an industrial personal computer. The power supply facility is used for supplying power for the industrial control computer and the detection device 4. The industrial personal computer is used for controlling the detection device 4 which extends into the LNG storage tank, realizing depth position control, detector opening and closing control, imaging parameter control, size measurement control, temperature distribution imaging control, leakage alarm control, data processing, storage control and the like, and also realizing the maintenance of the whole system. The depth position control means that the position information received by the laser equipment is transmitted to a control system outside the tank through a cable, and the control system controls the lowering depth of the equipment through a cable device.

In the above embodiments, the magnetic fixing block 5 has magnetic property, and the mass is not less than 25 kg.

In the above embodiments, a signal interface may be further disposed on the sealed housing, and is used for the detection device 4 to perform signal communication with an external device.

To sum up, the utility model discloses when using, pass the back hole 9 of detecting device 4 through phi 25 stainless steel stranded conductor earlier, connect magnetism fixed block 5, the magnetism fixed block is 25 kg. Use steel strand wires cable axle slowly to reserve the mounting hole with magnetic fixation block 5 through 8 inches on the LNG tank top and transfer to the storage tank bottoms, treat that the taut steel strand wires of magnetic adsorption completion back. Slowly transfer detecting device 4 to the jar in through tank deck preformed hole, transfer the degree of depth through power supply and signal cable 10 control, transfer it along vertical direction through steel strand wires control. The detection of the shooting angle (from 45 degrees to-315 degrees) is controlled by controlling the rotating shaft of the detection device, and the detection of the circumferential direction is realized by controlling the detection device 4 to rotate horizontally.

Example (b):

as shown in fig. 1, the lighting device 8 included in the detection apparatus 4 is an LED lighting device, the color temperature of the lighting device is 5000K, the effective range of visible light reaches 80 meters, the resolution of the device is 800 ten thousand pixels due to visible light, the device zooms by 80 times, the zooming mode is an automatic means, and the device withstands a pressure of 50 bar. The detection device 4 also comprises a phase scanning laser imaging device, can generate three-dimensional imaging for the space in the storage tank, and has the measurement distance of 80 meters and the measurement precision of 3 mm. The sealed housing of the probe 4 is made of epoxy transparent resin. The sealed shell is internally vacuumized and insulated. And the power supply and control system 2 and the detection device 2 are in signal communication through a cable and an MODBUS485 interface. The power supply and control system 2 can realize the operations of shooting, video recording, three-dimensional imaging, signal processing and recording of the access equipment.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that these are merely examples and that the scope of the present invention is defined by the appended claims, and that various changes and modifications may be made to these embodiments by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides an inside visual integrated device of surveying of LNG storage tank which characterized in that includes: the device comprises an LNG storage tank, a power supply and control system, a cable device, a detection device and a magnetic fixing block;

a mounting hole is reserved in the tank top of the LNG storage tank, the cable device is mounted outside the tank top of the LNG storage tank, the first end of the cable device is arranged in the LNG storage tank through the mounting hole, the end part of the first end of the cable device is provided with the magnetic fixing block, and the magnetic fixing block is adsorbed at the bottom of the tank body of the LNG storage tank; the second end of the cable device is connected with the power supply and control system arranged outside the LNG storage tank; and the cable device is provided with the detection device, and the detection device realizes the visual detection of the interior of the LNG storage tank.

2. The apparatus of claim 1, wherein the cabling means comprises power and signal cables, steel strand cables, and cable shafts; one end of the power supply and signal cable is connected with the detection device, and the other end of the power supply and signal cable is connected with the power supply and control system through the cable shaft; the first end of the steel strand cable is connected with the magnetic fixing block, and the second end of the steel strand cable is connected with the cable shaft arranged outside the LNG tank top through the mounting hole.

3. The apparatus of claim 2, wherein the power and signal cable comprises a cable housing, a cold insulation layer, a signal cable, and a power cable; the cold insulation layer is arranged on the inner side of the cable shell, and the signal cable and the power supply cable are positioned in the cold insulation layer; the signal cable and the power supply cable are connected with the detection device and used for supplying power to the detection device and transmitting the signals detected by the detection device to the power supply and control system through the signal cable.

4. The apparatus of claim 2, wherein the detection device comprises a sealed housing and a back hole, and a mounting seat, an image pickup device, a laser imaging device and an illumination device which are arranged in the sealed housing; the camera shooting equipment, the laser imaging equipment and the illuminating equipment are arranged on the mounting seat through a rotating shaft, the rotating shaft is driven to rotate by a motor arranged in the sealed shell, and the motor is connected with the power supply and control system through the power supply and signal cable; the back hole is formed in the back of the sealing shell, and the first end of the steel strand cable penetrates through the back hole to be connected with the magnetic fixing block; the power supply and signal cable penetrates through the sealing shell to be connected with the camera shooting equipment, the laser imaging equipment and the lighting equipment to supply power to all parts, and image signals collected by the camera shooting equipment and the laser imaging equipment are transmitted to the power supply and control system through the signal cable.

5. The apparatus of claim 4, wherein the lighting device is an LED lighting device, and the color temperature of the light source is 3000K or 6000K; the rated service life of the lighting facility is more than or equal to 5000 hours; the central illumination should be equal to or greater than 33000 lx.

6. The apparatus according to claim 4, wherein the resolution of the image pickup device is 200 ten thousand pixels or more; the sensitivity is not less than 0.21ux @ f 1.4; the focusing mode is an automatic focusing mode or a manual focusing mode; the zooming range is not less than 30:1, and the zooming mode is manual control or electric control; the image pickup apparatus withstands an applied air pressure of not less than 50 bar.

7. The apparatus according to claim 4, wherein the sealed housing is a sealed chamber made of a transparent material such as a special glass or a special resin material, and the sealed chamber is evacuated.

8. The apparatus of claim 7, wherein the specialty glass or specialty resin is an ultra-low temperature material that is resistant below-165 ℃.

9. The apparatus of claim 1, wherein the power supply and control system comprises a mobile power supply facility and an industrial personal computer; the power supply facility is used for supplying power to the industrial personal computer and the detection device; the industrial control computer controls the detection device which extends into the LNG storage tank.