Carbon fiber and optical fiber collaborative sensing rotational flow heating and leakage positioning device

Abstract

The invention discloses a carbon fiber and optical fiber collaborative sensing rotational flow heating and leakage positioning device. The device comprises a flange, an inlet pipe, an outer pipe, a heat preservation layer, an inner pipe, carbon fibers, distributed optical fibers, rotational flow blades, a mounting groove, a mounting raised head and a data acquisition system. The mounting raised head and the mounting groove are in semicircular fit to reduce friction, the connecting shaft and the mounting groove are in threaded connection to facilitate disassembly, the carbon fiber and the distributed optical fiber are spirally wound in parallel, and the inner pipe is additionally provided with the swirl vane, so that the heat exchange efficiency is remarkably improved, and the distributed optical fiber is connected to a data acquisition system. The heating temperature can be monitored in real time, and whether the pipeline leaks or not and the leakage position can be judged.

Description

Technical Field

[0001] The present invention relates to the field of electric heating technology and pipeline transportation, and in particular to a swirl heating and leakage locating device with coordinated sensing of carbon fiber and optical fiber. Background Art

[0002] As a new type of high-performance material, carbon fiber has excellent properties such as light weight, high strength, high temperature resistance, good chemical stability, and stable resistivity. The carbon fiber heating element heats by infrared radiation after being powered on. It has high thermal conversion efficiency and the electric heat conversion rate can reach more than 95%. It heats up quickly and can reach the set temperature in a short time. At the same time, it has good flexibility and can be used in various special-shaped or bendable scenes. It has significant energy-saving effects and higher safety.

[0003] Traditional resistance wire heating methods have low heat transfer efficiency, and pipeline disassembly is cumbersome. After aging of the heating wire, the entire pipeline often needs to be replaced. Real-time temperature monitoring during heating is not convenient. Electromagnetic heating methods are only applicable to metal pipelines. In addition, under high-frequency alternating magnetic fields, eddy currents are concentrated on the surface of the pipeline due to the skin effect, making it difficult for heat to penetrate the inner wall. The fluid heating efficiency at the center of the fluid is low, and the fluid flows along the pipe axis. When the flow rate in the pipe is high, the heat exchange time per unit pipe length is short, and the heating effect is poor. Distributed fiber optic monitoring systems, based on the principle of Raman scattering, can achieve continuous distribution measurement of parameters such as temperature and strain along the entire fiber optic path. Due to their significant advantages such as body perception, strong real-time performance, high positioning accuracy, and strong anti-electromagnetic interference capabilities, they are being rapidly integrated into the new generation of pipeline integrity management systems and have become a key enabling technology for intelligent status monitoring. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a swirl heating and leakage locating device with collaborative sensing of carbon fiber and optical fiber. The device has a simple disassembly method and the heating wire can be easily replaced; it can monitor the pipeline heating temperature in real time and determine whether the pipeline is leaking and the location of the leak; it has an efficient fluid heating effect in the pipe and is suitable for heating various metal and non-metal inner pipes.

[0005] To achieve the above functions, the technical solutions of the present invention are as follows:

[0006] A swirl heating and leak location device with coordinated sensing of carbon fiber and optical fiber. The device comprises a flange, an inlet pipe, an outer pipe, an insulation layer, an inner pipe, carbon fiber, distributed optical fiber, swirl blades, a mounting slot, a mounting head, and a data acquisition system. The mounting slot is connected to the outside of the flange. The outer side of the inner pipe is spirally wound with parallel carbon fiber and distributed optical fiber. The outer side of the inner pipe is an insulation layer, and the outer side of the insulation layer is a glass fiber outer pipe. The inner pipe is equipped with swirl blades. The mounting head is threadedly mounted to the mounting slot. The carbon fiber is connected to the data acquisition system via carbon fiber electrodes and wires.

[0007] Furthermore, a carbon fiber electrode, an optical fiber electrode and an inlet pipe are embedded in the flange.

[0008] Furthermore, the tail of the inlet pipe is a semicircular groove with an opening, which can be tightly connected to the semicircular mounting boss with an opening. The outer surface of the semicircular mounting boss is a connecting shaft with external threads, which can be connected to the mounting groove with internal threads.

[0009] Furthermore, the carbon fiber and the distributed optical fiber are spirally wound on the outer wall of the inner tube in parallel, the carbon fiber is connected to the carbon fiber electrode on the flange, and the distributed optical fiber is connected to the optical fiber electrode on the flange.

[0010] Furthermore, the inner tube is provided with swirl blades, and the direction of the swirl blades is the same as the winding direction of the carbon fiber and the distributed optical fiber.

[0011] Preferably, the carbon fiber heating material is made of a mixture of heat-stable carbon fiber and cotton fiber weft yarn in a ratio of 1:2, the insulation layer is made of quartz fiber yarn, and the outer tube is made of quartz glass tube.

[0012] The beneficial effects of the present invention are:

[0013] (1) The present invention provides a swirl heating and leakage positioning device with cooperative sensing of carbon fiber and optical fiber. The semicircular groove and semicircular protrusion at the tail of the inlet pipe can reduce the friction generated during disassembly. The two ends of the inner pipe are mounting protrusions with external threads, which can be easily removed from the mounting groove, and the aging carbon fiber heating wire can be replaced regularly.

[0014] (2) The distributed optical fiber wound on the inner tube is connected to the optical fiber electrode embedded in the flange and connected to the data acquisition system through an external wire. By analyzing the temperature distribution signal and the filter signal, the temperature change of the pipeline can be monitored in real time, and whether the pipeline is leaking and the location of the leak can be determined.

[0015] (3) The direction of the swirl blades in the inner tube is consistent with the winding direction of the carbon fiber and the distributed optical fiber, so that when the fluid flows in the inner tube, the fluid in the pipe flows along the winding direction of the carbon fiber and the distributed optical fiber. The swirl blade axis makes the fluid at the center of the tube axis closer to the heated tube wall, which significantly improves the heat exchange effect between the fluid and the tube wall.

[0016] (4) The device can be applied to inner tubes of various metal or non-metal materials. The carbon fiber material used is a 1:2 mixed winding of carbon fiber and cotton fiber weft yarn, which has an efficient and stable heating effect. The quartz fiber yarn insulation layer provides a long-lasting insulation effect. The quartz glass tube outer tube has good strength and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of carbon fiber and distributed optical fiber winding methods;

[0019] Figure 3 It is the axial cross-sectional view of the pipeline;

[0020] Figure 4 It is a schematic diagram of the swirl blade structure;

[0021] Figure 5 It is the left view of the pipeline;

[0022] Figure 6 It is a partial enlarged schematic diagram of the pipeline structure.

[0023] Wherein: 1. Flange; 2. Carbon fiber electrode; 3. Inlet tube; 4. Fiber optic electrode; 5. Outer tube;

[0024] 6. Insulation layer; 7. Carbon fiber; 8. Distributed optical fiber; 9. Inner tube; 10. Swirl blade shaft;

[0025] 11. Swirl blade; 12. Mounting boss; 13. Mounting slot; 14. Externally threaded connecting shaft; 15. Wire; 16. Data acquisition system. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings, which are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0027] Figure 1 、 Figure 2 、 Figure 3 and Figure 4The device, which uses carbon fiber and optical fiber for collaborative sensing, is shown. It includes a flange 1, an inlet pipe 3, an outer pipe 5, an insulation layer 6, an inner pipe 9, carbon fibers 7, distributed optical fibers 8, swirl blades 11, a mounting groove 13, a mounting boss 12, and a data acquisition system 16. The flange 1 is connected to the outside of the mounting groove 13. Parallel carbon fibers 7 and distributed optical fibers 8 are spirally wound around the outside of the inner pipe 9. The outer side of the inner pipe 9 is a layer of insulation layer 6, and the outer side of the insulation layer 6 is a glass fiber outer pipe 5. The inner pipe 9 is equipped with swirl blades 11. The mounting boss 12 is threadedly mounted to the mounting groove 13. The carbon fibers 7 are connected to the data acquisition system 16 via carbon fiber electrodes 2 and wires 15.

[0028] Further, refer to Figure 5 The flange 1 is embedded with a carbon fiber electrode 2, an optical fiber electrode 4 and an inlet tube 3.

[0029] Further, refer to Figure 6 The tail of the inlet pipe 3 is a semicircular groove with an opening, which can be tightly connected to the semicircular mounting boss 12 with an opening. The outer surface of the semicircular mounting boss 12 is a connecting shaft 14 with an external thread, which can be connected to the mounting groove 13 with an internal thread.

[0030] Further, refer to Figure 2 The carbon fiber 7 and the distributed optical fiber 8 are spirally wound in parallel on the outer wall of the inner tube 9. The carbon fiber 7 is connected to the carbon fiber electrode 2 on the flange 1, and the distributed optical fiber 8 is connected to the optical fiber electrode 4 on the flange 1.

[0031] Further, refer to Figure 4 The inner tube 9 is provided with a swirl blade 11 , and the direction of the swirl blade 11 is the same as the winding direction of the carbon fiber 7 and the distributed optical fiber 8 .

[0032] Preferably, the carbon fiber 7 is made of a mixture of heat-stable carbon fiber and cotton fiber weft yarn in a ratio of 1:2, the thermal insulation layer 6 is made of quartz fiber yarn, and the outer tube 5 is made of quartz glass tube.

[0033] 13. The present invention relates to a swirl heating and leakage positioning device with cooperative sensing of carbon fiber and optical fiber. During installation, first align the mounting boss 12 at one end of the inner tube 9 with the mounting groove 13 so that the connecting shaft 14 with the external thread is embedded in the mounting groove 13 with the internal thread. The flange 1 is rotated so that the semicircular convex surface of the mounting boss 12 is completely embedded in the semicircular groove of the mounting groove 13. The carbon fiber 7 and the distributed optical fiber 8 are respectively inserted into the carbon fiber electrode 2 and the optical fiber electrode 4 on the flange 1. Then, they are wound in parallel spirally along the inner tube 9. During the winding, the carbon fiber 7 and the distributed optical fiber 8 are kept at a certain distance. After the winding is completed, an insulation layer 6 is wrapped on the inner tube 9, and the outer tube 5 is put on. The flange 1 at the other end is connected to the mounting boss 12 at the other end through the mounting groove 13. When the flange 1 is about to be tightened, the carbon fiber 7 and the distributed optical fiber 8 left at the other end are inserted into the carbon fiber electrode 2 and the optical fiber electrode 4 of the flange 1. Then, the flange 1 is tightened, the carbon fiber electrode 2 is connected to the power supply, and the optical fiber electrode 4 is connected to the data acquisition system 16 through the wire 15 to complete the installation of the heating device.

[0034] When the carbon fiber 7 needs to be replaced, first loosen the flange 1 slightly, take out the carbon fiber 7 and distributed optical fiber 8 connected to the carbon fiber electrode 2 and optical fiber electrode 4 on the flange 1, then rotate the flange 1 to withdraw the mounting boss 12, remove the outer tube 5 and the insulation layer 6, and then remove the carbon fiber 7 in the opposite direction of winding. Then, the carbon fiber 7 can be replaced by following the above installation steps. This disassembly and assembly method is simple to operate and is not likely to cause damage to the pipeline.

[0035] During use, the carbon fiber 7 is first energized to preheat the pipeline. After the carbon fiber reaches the operating temperature, the fluid to be heated is input through the inlet pipe 3. The fluid spirally flows in the inner tube 9 along the direction of the swirl blade 11. The flow direction is consistent with the winding direction of the carbon fiber 7 and the distributed optical fiber 8. The added swirl blade shaft distributes the fluid originally in the center of the tube axis into the spiral flow, so that more fluid contacts the heated tube wall, prolongs the heating time in the tube, and significantly improves the heat exchange effect of the fluid in the tube. The data acquisition system 16 is used to analyze the temperature distribution signal and the filtered signal on the distributed optical fiber 8 collected along the pipeline. The temperature distribution signal can monitor the heating temperature along the pipeline. The temperature distribution signal is filtered to remove noise signals. Multi-level alarm thresholds are set according to the operating conditions along the pipeline. When a leak occurs in the pipeline, its temperature filter signal will undergo a significant downward fluctuation. When the set alarm threshold is exceeded, the system will determine the different levels of leakage and issue an alarm message. The location of the leak can be determined based on the signal distance of the alarm message, and the positioning accuracy can be accurate to within 1 meter. This device can be used to heat various metal or non-metal inner pipes. Using this heating device for newly built pipelines can simplify the heating wire replacement steps, greatly improve the heating efficiency of the pipeline, monitor the pipeline heating temperature in real time, and determine whether the pipeline is leaking and the location of the leak.

[0036] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A swirl heating and leakage locating device with cooperative sensing of carbon fiber and optical fiber, comprising a flange (1), an inlet pipe (3), an outer pipe (5), an insulation layer (6), an inner pipe (9), carbon fiber (7), distributed optical fiber (8), swirl blades (11), a mounting groove (13), a mounting boss (12), and a data acquisition system (16). It is characterized by: The outer side of the installation groove (13) is connected to a flange (1); the outer side of the inner tube (9) is spirally wound with parallel carbon fibers (7) and distributed optical fibers (8); the outer side of the inner tube (9) is a thermal insulation layer (6); the outer side of the thermal insulation layer (6) is a glass fiber outer tube (5); the inner tube (9) is equipped with a swirl blade (11); the installation boss (12) is screw-mounted to the installation groove (13); the carbon fibers (7) are connected to a data acquisition system (16) via a carbon fiber electrode (2) and a wire (15).

2. The carbon fiber and optical fiber collaborative sensing swirl heating and leakage locating device according to claim 1, characterized in that: A carbon fiber electrode (2), an optical fiber electrode (4) and an inlet pipe (3) are embedded in the flange (1).

3. The carbon fiber and optical fiber collaborative sensing swirl heating and leakage locating device according to claim 1, characterized in that: The tail of the inlet pipe (3) is a semicircular groove with an opening, which can be tightly connected to the semicircular mounting boss (12) with an opening. The outer surface of the semicircular mounting boss (12) is a connecting shaft (14) with external threads, which can be connected to the mounting groove (13) with internal threads.

4. The carbon fiber and optical fiber collaborative sensing swirl heating and leakage locating device according to claim 1 is characterized by: The carbon fiber (7) and the distributed optical fiber (8) are wound in parallel spirally on the outer wall of the inner tube (9); the carbon fiber (7) is connected to the carbon fiber electrode (2) on the flange (1); and the distributed optical fiber (8) is connected to the optical fiber electrode (4) on the flange (1).

5. The carbon fiber and optical fiber collaborative sensing swirl heating and leakage locating device according to claim 1 is characterized by: The inner tube (9) is provided with a swirl blade (11), and the direction of the swirl blade (11) is the same as the winding direction of the carbon fiber (7) and the distributed optical fiber (8).

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