Device for comprehensively detecting temperature of inner tank of LNG (Liquefied Natural Gas) storage tank

Abstract

The utility model discloses a device for detecting the temperature of an inner tank of an LNG (Liquefied Natural Gas) storage tank in all directions, which relates to the technical field of LNG storage tank temperature detection and comprises a temperature sensing optical cable laid on the inner tank of the LNG storage tank and connected with a distributed optical fiber temperature detection system. The temperature sensing optical cable comprises an outer wall optical cable laid on the outer wall of the inner tank of the LNG storage tank and a bottom optical cable arranged at the bottom of the inner tank of the LNG storage tank. The temperature of the inner tank of the LNG storage tank is detected through the distributed optical fiber temperature detection system, 360-degree temperature detection is carried out on the outer wall of the inner tank of the LNG storage tank through the outer wall optical cable, temperature detection is carried out on the bottom of the inner tank through the bottom optical cable, the temperature monitoring range of the inner tank of the LNG storage tank is widened, and all-dimensional temperature detection on the inner tank of the LNG storage tank is completed. Only one optical cable inlet hole and one optical cable outlet hole need to be formed in the tank top, the laying requirement of the temperature sensing optical cable can be met, the number of holes formed in the tank top is reduced, and the risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of LNG storage tank temperature detection, in particular to a device for all-round detection of the inner tank temperature of an LNG storage tank. Background Art

[0002] The existing LNG tank temperature monitoring method generally controls the tank temperature by arranging dozens of resistance temperature monitors (RTDs) in the annular space and the bottom of the tank. This method has many disadvantages: RTDs are deployed in a point-by-point manner and can only monitor the temperature at the node. The temperature between the monitoring points cannot be measured, resulting in a large blind spot; when the leakage point is far away from the RTD monitoring point and the leakage amount is not large, the RTD monitoring will have serious lags; RTD needs to introduce the electrical signal of each node into the tank separately and contact the tank structural material, which poses certain safety hazards. Utility Model Content

[0003] The utility model aims to provide a device for all-round detection of the temperature inside an LNG storage tank, aiming to solve the technical problems in the prior art that the temperature detection device has a small detection range, a detection blind area, and certain safety hazards.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A device for all-round detection of the temperature of an inner tank of an LNG storage tank, comprising a temperature-sensitive optical cable laid on the inner tank of the LNG storage tank, the temperature-sensitive optical cable being connected to a distributed optical fiber temperature detection system, the temperature-sensitive optical cable comprising an outer wall optical cable laid on the outer wall of the inner tank of the LNG storage tank and a bottom optical cable arranged at the bottom of the inner tank of the LNG storage tank.

[0006] The above structure is adopted to detect the temperature of the inner tank of the LNG storage tank through the distributed optical fiber temperature detection system. The outer wall optical cable performs 360-degree temperature detection on the outer wall of the inner tank of the LNG storage tank, and the bottom optical cable performs temperature detection on the bottom of the inner tank, thereby increasing the temperature monitoring range of the inner tank of the LNG storage tank and completing the full range of temperature detection of the inner tank of the LNG storage tank. Only one optical cable inlet hole and one optical cable outlet hole are required on the tank top to meet the layout requirements of the temperature-sensitive optical cable, reduce the number of holes on the tank top, and reduce risks.

[0007] Preferably, the outer wall optical cable is arranged in a serpentine shape. The outer wall optical cable arranged in a serpentine shape can increase the distribution range of the external optical cable, thereby further increasing the temperature monitoring range of the inner tank of the LNG storage tank.

[0008] Preferably, the bottom optical cable extends along the bottom diameter of the inner tank of the LNG storage tank. The bottom optical cable adopts the above structure, which can facilitate the connection between the outer wall optical cable and the bottom optical cable.

[0009] Preferably, one end of the bottom optical cable is connected to one end of the outer wall optical cable, and the other ends of the bottom optical cable and the outer wall optical cable pass through the LNG storage tank and are connected to the distributed optical fiber temperature detection system. The other ends of the bottom optical cable and the outer wall optical cable pass through the LNG storage tank and are connected to the distributed optical fiber temperature detection system, and the temperature of each point along the temperature-sensitive optical cable is detected by the distributed optical fiber temperature monitoring system.

[0010] Preferably, the temperature-sensitive optical cable comprises an inner tube, an outer tube, a plurality of armored steel wires arranged between the inner tube and the outer tube, and a sensing optical fiber arranged in the inner tube. The temperature-sensitive optical cable adopts an inner and outer double-layer tube and armored steel wire structure to ensure that the optical cable is not easily damaged during the construction process.

[0011] Preferably, the plurality of armored steel wires are evenly distributed along the circumference of the inner tube. The plurality of armored steel wires are evenly distributed along the circumference of the inner tube, which can improve the strength of the temperature-sensitive optical cable in all directions.

[0012] Preferably, the inner tube and the outer tube are both seamless steel tubes. The use of seamless steel tubes can improve the strength of the temperature-sensitive optical cable and further avoid damage to the temperature-sensitive optical cable.

[0013] Preferably, the temperature sensing optical cable is a low temperature resistant temperature sensing optical cable. The low temperature resistant optical cable can meet the temperature detection in the range of -180°C to 85°C.

[0014] After adopting the above technical solution, the beneficial effects of the utility model are:

[0015] The temperature inside the LNG tank is detected through the distributed optical fiber temperature detection system. The outer wall optical cable performs 360-degree temperature detection on the outer wall of the inner tank of the LNG tank, and the bottom optical cable performs temperature detection on the bottom of the inner tank, thereby increasing the temperature monitoring range of the inner tank of the LNG tank and completing the full range of temperature detection of the inner tank of the LNG tank. Only one optical cable entry hole and one optical cable exit hole are required on the top of the tank to meet the layout requirements of the temperature-sensitive optical cable, reduce the number of holes on the tank top, and reduce risks. The temperature-sensitive optical cable adopts an inner and outer double-layer tube and armored steel wire structure to ensure that the optical cable is not easily damaged during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a device for all-round detection of the temperature inside an LNG storage tank according to the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the temperature-sensitive optical cable;

[0018] Figure 3 Schematic diagram of the laying of temperature-sensitive optical cable.

[0019] In the figure, there is an inner tank 1 of the LNG storage tank, an outer wall optical cable 2, a bottom optical cable 3, an inner tube 4, an outer tube 5, an armored steel wire 6, and a sensing optical fiber 7. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings.

[0021] The orientations mentioned in this specification are based on the orientations of the device for all-round detection of the temperature inside an LNG storage tank of the utility model during normal operation, and do not limit the orientations during storage and transportation. They only represent relative position relationships, not absolute position relationships.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, a device for all-round detection of the temperature of the inner tank of an LNG storage tank includes a temperature-sensitive optical cable laid on the inner tank of the LNG storage tank, the temperature-sensitive optical cable is connected to a distributed optical fiber temperature detection system, and the temperature-sensitive optical cable includes an outer wall optical cable 2 laid on the outer wall of the inner tank of the LNG storage tank and a bottom optical cable 3 arranged at the bottom of the inner tank of the LNG storage tank.

[0023] The temperature of the inner tank 1 of the LNG storage tank is detected by the distributed optical fiber temperature detection system. The distributed optical fiber temperature detection system can detect the temperature at any point along the temperature-sensitive optical cable, and there is no blind spot in the measurement. The outer wall optical cable 2 performs 360-degree temperature detection on the outer wall of the inner tank 1 of the LNG storage tank, and the bottom optical cable 3 performs temperature detection on the bottom of the inner tank, thereby increasing the temperature monitoring range of the inner tank of the LNG storage tank and completing the full range of temperature detection of the inner tank 1 of the LNG storage tank. Only one optical cable entry hole and one optical cable exit hole are required on the top of the tank to meet the layout requirements of the temperature-sensitive optical cable, reduce the number of holes on the tank top, and reduce risks.

[0024] Among them, the temperature sensing optical cable is a low temperature resistant temperature sensing optical cable. The low temperature resistant optical cable can meet the temperature detection in the range of -180℃~85℃.

[0025] The distributed optical fiber temperature detection system includes an optical cable splicing box connected to the temperature-sensitive optical cable, which is connected to the distributed optical fiber temperature detection system host through a communication optical cable, and the distributed optical fiber temperature detection system host is connected to the display terminal. The distributed optical fiber temperature detection system host is set in the machine room, and the display terminal of the distributed optical fiber temperature detection system is set in the duty room. The temperature of the inner tank of the LNG storage tank is monitored through the distributed optical fiber temperature detection system.

[0026] As a preferred example of this embodiment, the outer wall optical cable 2 is arranged in a serpentine shape. The outer wall optical cable 2 arranged in a serpentine shape can increase the distribution range of the external optical cable, thereby further increasing the temperature monitoring range of the inner tank of the LNG storage tank.

[0027] Furthermore, the bottom optical cable 3 extends along the bottom diameter of the inner tank of the LNG storage tank. The bottom optical cable 3 adopts the above structure, which can facilitate the connection between the outer wall optical cable 2 and the bottom optical cable 3.

[0028] Furthermore, one end of the bottom optical cable 3 is connected to one end of the outer wall optical cable 2, and the other ends of the bottom optical cable 3 and the outer wall optical cable 2 pass through the LNG storage tank and are connected to the distributed optical fiber temperature detection system. The top of the LNG storage tank is provided with an optical cable entrance and an optical cable exit, and the other end of the outer wall optical cable 2 passes through the optical cable entrance and is connected to the optical cable junction box, and the other end of the bottom optical cable 3 passes through the optical cable exit and is connected to the optical cable junction box. The other ends of the bottom optical cable 3 and the outer wall optical cable 2 pass through the LNG storage tank and are connected to the distributed optical fiber temperature detection system, and the temperature of each point along the temperature-sensitive optical cable is detected by the distributed optical fiber temperature monitoring system.

[0029] As a preferred example of this embodiment, the temperature-sensitive optical cable includes an inner tube 4, an outer tube 5, a plurality of armored steel wires 6 disposed between the inner tube 4 and the outer tube 5, and a sensing optical fiber 7 disposed in the inner tube 4. The inner tube 4 and the outer tube 5 are both circular in shape, and the axes of the inner tube 4 and the outer tube 5 are consistent. The inner and outer double-layer tubes and the armored steel wires 6 ensure that the optical cable is not easily damaged during the construction process.

[0030] Among them, the multiple armored steel wires 6 are evenly distributed along the circumference of the inner tube 4. The multiple armored steel wires 6 are evenly distributed along the circumference of the inner tube 4, which can comprehensively improve the strength of the temperature-sensitive optical cable.

[0031] Wherein, the inner tube 4 and the outer tube 5 are both seamless steel tubes. The use of seamless steel tubes can improve the strength of the temperature-sensitive optical cable and further avoid damage to the temperature-sensitive optical cable.

[0032] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A device for all-round detection of the temperature inside an LNG storage tank, characterized in that: It includes a temperature-sensitive optical cable laid on the inner tank of the LNG storage tank, the temperature-sensitive optical cable is connected to a distributed optical fiber temperature detection system, and the temperature-sensitive optical cable includes an outer wall optical cable laid on the outer wall of the inner tank of the LNG storage tank and a bottom optical cable arranged at the bottom of the inner tank of the LNG storage tank.

2. The device for omnidirectionally detecting the temperature inside the LNG storage tank according to claim 1, characterized in that: The outer wall optical cable is arranged in a serpentine shape.

3. The device for omnidirectionally detecting the temperature inside the LNG storage tank according to claim 2, characterized in that: The bottom optical cable extends along the bottom diameter of the inner tank of the LNG storage tank.

4. The device for omnidirectionally detecting the temperature inside the LNG storage tank according to claim 3, characterized in that: One end of the bottom optical cable is connected to one end of the outer wall optical cable, and the other ends of the bottom optical cable and the outer wall optical cable both pass through the LNG storage tank and are connected to the distributed optical fiber temperature detection system.

5. The device for omnidirectionally detecting the temperature inside the LNG storage tank according to claim 1, characterized in that: The temperature-sensitive optical cable comprises an inner tube, an outer tube, a plurality of armored steel wires arranged between the inner tube and the outer tube, and a sensing optical fiber arranged in the inner tube.

6. The device for omnidirectionally detecting the temperature inside the LNG storage tank according to claim 5, characterized in that: A plurality of armored steel wires are evenly distributed along the circumference of the inner tube.

7. The device for omnidirectionally detecting the temperature inside the LNG storage tank according to claim 5, characterized in that: The inner tube and the outer tube are both seamless steel tubes.

8. A device for omnidirectionally detecting the temperature inside an LNG storage tank according to any one of claims 1 to 7, characterized in that: The temperature-sensitive optical cable is a low-temperature-resistant temperature-sensitive optical cable.

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