Intelligent leakage-proof double-heat-exchanger structure

Abstract

The utility model discloses an intelligent leakproof double-heat-exchanger structure, which comprises a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are respectively connected with a material main inlet pipe, a material main outlet pipe, a heat exchange main inlet pipe and a heat exchange main outlet pipe, a plurality of first heat exchange pipes are arranged in the first heat exchanger, and a plurality of second heat exchange pipes are arranged in the second heat exchanger; each heat exchange pipe comprises an inner layer pipe and an outer layer pipe, inert gas is filled between the inner layer pipe and the outer layer pipe, a plurality of pressure sensors are embedded in the inner wall of the outer layer pipe, the pressure sensors are evenly arranged in a plurality of circles in the axial direction of the outer layer pipe, and a plurality of pressure sensors are evenly distributed in each circle in the circumferential direction. A plurality of sensing optical fibers are laid on the inner wall of the outer-layer pipe in parallel in the axial direction of the pipeline of the outer-layer pipe. When the inner-layer pipe leaks, pressure change can be detected, the control valve is triggered to act and switch fluid paths, normal operation cannot be affected, the outer-layer pipe can prevent fluid leakage, safety is improved, and maintenance is easy.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to an intelligent leak-proof dual heat exchanger structure. Background Technology

[0002] Heat exchangers are commonly used for heat exchange between two fluids and are widely used in industries such as chemical, petroleum, and power. Leaks in heat exchangers can occur in the tube sheet, welds, or the heat exchange tubes themselves, leading to fluid mixing, affecting heat exchange efficiency, and even causing safety accidents. Existing heat exchangers use a single-layer heat exchange tube structure, which, once damaged, cannot effectively prevent leaks, nor can the leak point be detected, necessitating shutdown for repairs and disrupting normal operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an intelligent anti-leakage dual heat exchanger structure, which aims to solve the technical problem that the existing single-layer heat exchange tube structure cannot effectively prevent leakage once it is damaged, cannot detect the leakage point, and can only be shut down for maintenance, thus affecting normal use.

[0004] The technical solution of this utility model is: an intelligent leak-proof dual heat exchanger structure, including a first heat exchanger and a second heat exchanger. The first heat exchanger and the second heat exchanger are respectively connected to a material main inlet pipe, a material main outlet pipe, a heat exchange main inlet pipe, and a heat exchange main outlet pipe. The first heat exchanger is provided with multiple first heat exchange tubes, and the second heat exchanger is provided with multiple second heat exchange tubes. Each heat exchange tube includes an inner tube and an outer tube. The space between the inner tube and the outer tube is filled with an inert gas. Multiple pressure sensors are embedded in the inner wall of the outer tube. The multiple pressure sensors are evenly arranged in several circles along the axial direction of the outer tube, and multiple sensors are evenly distributed circumferentially in each circle. Multiple sensing optical fibers are also laid parallel to the axial direction of the outer tube on its inner wall.

[0005] Furthermore, in this utility model, the first heat exchanger is provided with a first material inlet, a first material outlet, a first heat exchange inlet, and a first heat exchange outlet; the second heat exchanger is provided with a second material inlet, a second material outlet, a second heat exchange inlet, and a second heat exchange outlet; the main material inlet pipe is connected to the first material inlet and the second material inlet respectively through a first control valve and a second control valve; the main material outlet pipe is connected to the first material outlet and the second material outlet respectively through a third control valve and a fourth control valve; the main heat exchange inlet pipe is connected to the first heat exchange inlet and the second heat exchange inlet respectively through a fifth control valve and a sixth control valve; and the main heat exchange outlet pipe is connected to the first heat exchange outlet and the second heat exchange outlet respectively through a seventh control valve and an eighth control valve.

[0006] Furthermore, in this utility model, the two ends of each of the first heat exchange tubes are respectively connected to the first material inlet and the first material outlet, and the two ends of each of the second heat exchange tubes are respectively connected to the second material inlet and the second material outlet; the inner tube of each heat exchange tube is connected to the corresponding material inlet and outlet, and the inert gas filled between the outer tube and the inner tube of each heat exchange tube is nitrogen.

[0007] Furthermore, the inner tube in this invention is made of silicon carbide composite material, and the outer tube is made of stainless steel.

[0008] Furthermore, in this utility model, the pressure sensor is fixedly installed inside the outer tube by high-temperature resistant epoxy resin, the surface of the pressure sensor is covered with a protective film, and the cable of the pressure sensor is led out through a sealing sleeve, which is installed on the outer wall of the outer tube.

[0009] Furthermore, the protective film described in this utility model is a polytetrafluoroethylene protective film.

[0010] Furthermore, in this invention, the sensing optical fiber is tightly bonded to the inner wall of the outer tube using UV-curable adhesive.

[0011] Furthermore, the sensing optical fiber described in this invention is externally fitted with a stainless steel flexible tube.

[0012] Compared with the prior art, the present invention has the following advantages: The heat exchanger of the present invention adopts a double-layer heat exchange tube structure. The inner tube transmits high-temperature fluid, and the outer tube serves as a protective layer. The space between the two layers is filled with inert gas and equipped with a pressure sensor and sensing fiber. When the inner tube leaks, the pressure change will be detected, triggering the control valve to switch the fluid path without affecting normal operation. The outer tube can prevent fluid leakage, improve safety, and is easy to maintain. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the specific structure of the heat exchange tube in this utility model;

[0015] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0016] Figure 4 for Figure 2 A magnified view of part B in the middle.

[0017] in:

[0018] 1. First heat exchanger; 1a. First material inlet; 1b. First material outlet; 1c. First heat exchange inlet; 1d. First heat exchange outlet; 1e. First heat exchange tube;

[0019] 2. Second heat exchanger; 2a. Second material inlet; 2b. Second material outlet; 2c. Second heat exchange inlet; 2d. Second heat exchange outlet; 2e. Second heat exchange tube;

[0020] 3. Main material inlet pipe; 4. Main material outlet pipe; 5. Main heat exchange inlet pipe; 6. Main heat exchange outlet pipe; 7. Inner tube; 8. Outer tube; 9. Pressure sensor; 10. High-temperature resistant epoxy resin; 11. Protective film; 12. Sealing sleeve; 13. Sensor fiber optic cable; 14. Stainless steel flexible hose;

[0021] a1, First control valve; a2, Second control valve; b1, Third control valve; b2, Fourth control valve; c1, Fifth control valve; c2, Sixth control valve; d1, Seventh control valve; d2, Eighth control valve. Detailed Implementation

[0022] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0023] Example:

[0024] The accompanying drawings illustrate a specific embodiment of the intelligent leak-proof dual heat exchanger structure of this utility model. (Refer to...) Figure 1 It mainly includes a first heat exchanger 1 and a second heat exchanger 2. The first heat exchanger 1 is provided with a first material inlet 1a, a first material outlet 1b, a first heat exchange inlet 1c, and a first heat exchange outlet 1d. The second heat exchanger 2 is provided with a second material inlet 2a, a second material outlet 2b, a second heat exchange inlet 2c, and a second heat exchange outlet 2d.

[0025] The first heat exchanger 1 and the second heat exchanger 2 are respectively connected to the main material inlet pipe 3, the main material outlet pipe 4, the main heat exchange inlet pipe 5, and the main heat exchange outlet pipe 6. The main material inlet pipe 3 is connected to the first material inlet 1a and the second material inlet 2a through the first control valve a1 and the second control valve a2, respectively. The main material outlet pipe 4 is connected to the first material outlet 1b and the second material outlet 2b through the third control valve b1 and the fourth control valve b2, respectively. The main heat exchange inlet pipe 5 is connected to the first heat exchange inlet 1c and the second heat exchange inlet 2c through the fifth control valve c1 and the sixth control valve c2, respectively. The main heat exchange outlet pipe 6 is connected to the first heat exchange outlet 1d and the second heat exchange outlet 2d through the seventh control valve d1 and the eighth control valve d2, respectively.

[0026] The first heat exchanger 1 is provided with multiple first heat exchange tubes 1e, and the two ends of each first heat exchange tube 1e are respectively connected to the first material inlet 1a and the first material outlet 1b. The second heat exchanger 2 is provided with multiple second heat exchange tubes 2e, and the two ends of each second heat exchange tube 2e are respectively connected to the second material inlet 2a and the second material outlet 2b.

[0027] Combination Figure 2 Each heat exchange tube in the two heat exchangers includes an inner tube 7 and an outer tube 8. The inner tube 7 of each heat exchange tube is connected to the corresponding material inlet and outlet. The inner tube 7 is made of silicon carbide composite material and is used to transport high-temperature fluids. The outer tube 8 wraps around the inner tube 7 and is made of stainless steel.

[0028] Each heat exchanger tube has an inert gas, namely nitrogen, between its outer tube 8 and inner tube 7. This inert gas can absorb pressure fluctuations caused by normal thermal expansion and contraction.

[0029] Multiple pressure sensors 9 are embedded in the inner wall of the outer tube 8. These sensors are arranged in several rings along the axial direction of the outer tube 8, with multiple sensors evenly distributed circumferentially within each ring, forming a grid-like monitoring system to monitor changes in gap pressure in real time. Combined with... Figure 3 The pressure sensor 9 is fixedly installed inside the outer tube 8 by a high-temperature resistant epoxy resin 10 to avoid affecting fluid flow. The surface of the pressure sensor 9 is covered with a protective film 11, which is a polytetrafluoroethylene protective film that is resistant to corrosive media. The cable of the pressure sensor 9 is led out through a sealing sleeve 12, which is installed on the outer wall of the outer tube 8 to prevent inert gas leakage.

[0030] Multiple sensing optical fibers 13 are laid parallel to the axial direction of the outer tube 8 on its inner wall to monitor temperature, strain, and vibration signals. Figure 4 The sensing fiber 13 is tightly bonded to the inner wall of the outer tube 8 with UV-curable adhesive. The sensing fiber 13 is encased in a stainless steel flexible tube 14 to prevent mechanical impact and chemical corrosion.

[0031] In operation, the first control valve a1, the third control valve b1, the fifth control valve c1, and the seventh control valve d1 are opened, while the other control valves are closed, and the first heat exchanger 1 is in operation. If a leak is detected in the first heat exchanger 1, the first control valve a1, the third control valve b1, the fifth control valve c1, and the seventh control valve d1 are closed, and the second control valve a2, the fourth control valve b2, the sixth control valve c2, and the eighth control valve d2 are opened, enabling the second heat exchanger 2 to operate without affecting normal operation. When the inner tube 7 leaks, the outer tube 8 can prevent fluid leakage, improving safety and facilitating maintenance.

[0032] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A smart leak-proof dual heat exchanger structure, characterized in that: It includes a first heat exchanger (1) and a second heat exchanger (2). The first heat exchanger (1) and the second heat exchanger (2) are respectively connected to the material inlet pipe (3), the material outlet pipe (4), the heat exchange inlet pipe (5), and the heat exchange outlet pipe (6). The first heat exchanger (1) is provided with multiple first heat exchange tubes (1e), and the second heat exchanger (2) is provided with multiple second heat exchange tubes (2e). Each heat exchange tube includes an inner tube (7) and an outer tube (8). The space between the inner tube (7) and the outer tube (8) is filled with inert gas. Multiple pressure sensors (9) are embedded in the inner wall of the outer tube (8). The multiple pressure sensors (9) are evenly arranged in several circles along the axial direction of the outer tube (8), and multiple sensors (9) are evenly distributed in each circle. Multiple sensing optical fibers (13) are also laid parallel to the inner wall of the outer tube (8) along its pipe axis.

2. The intelligent leak-proof dual heat exchanger structure according to claim 1, characterized in that: The first heat exchanger (1) is provided with a first material inlet (1a), a first material outlet (1b), a first heat exchange inlet (1c), and a first heat exchange outlet (1d). The second heat exchanger (2) is provided with a second material inlet (2a), a second material outlet (2b), a second heat exchange inlet (2c), and a second heat exchange outlet (2d). The main material inlet pipe (3) is connected to the first material inlet (1a) and the second material inlet (2a) through the first control valve (a1) and the second control valve (a2), respectively. The main material outlet pipe (4) is connected to the first material outlet (1b) and the second material outlet (2b) through the third control valve (b1) and the fourth control valve (b2), respectively. The main heat exchange inlet pipe (5) is connected to the first heat exchange inlet (1c) and the second heat exchange inlet (2c) through the fifth control valve (c1) and the sixth control valve (c2), respectively. The main heat exchange outlet pipe (6) is connected to the first heat exchange outlet (1d) and the second heat exchange outlet (2d) through the seventh control valve (d1) and the eighth control valve (d2), respectively.

3. The intelligent leak-proof dual heat exchanger structure according to claim 2, characterized in that: Each of the first heat exchange tubes (1e) is connected to the first material inlet (1a) and the first material outlet (1b) at both ends, and each of the second heat exchange tubes (2e) is connected to the second material inlet (2a) and the second material outlet (2b) at both ends, respectively; the inner tube (7) of each heat exchange tube is connected to the corresponding material inlet and outlet, and the inert gas filled between the outer tube (8) and the inner tube (7) of each heat exchange tube is nitrogen.

4. The intelligent leak-proof dual heat exchanger structure according to claim 1, characterized in that: The inner tube (7) is made of silicon carbide composite material, and the outer tube (8) is made of stainless steel.

5. The intelligent leak-proof dual heat exchanger structure according to claim 1, characterized in that: The pressure sensor (9) is fixedly installed inside the outer tube (8) by high-temperature resistant epoxy resin (10). The surface of the pressure sensor (9) is covered with a protective film (11). The cable of the pressure sensor (9) is led out through a sealing sleeve (12), which is installed on the outer wall of the outer tube (8).

6. The intelligent leak-proof dual heat exchanger structure according to claim 5, characterized in that: The protective film (11) is a polytetrafluoroethylene protective film.

7. The intelligent leak-proof dual heat exchanger structure according to claim 1, characterized in that: The sensing optical fiber (13) is tightly bonded to the inner wall of the outer tube (8) with UV-curable adhesive.

8. The intelligent leak-proof dual heat exchanger structure according to claim 1, characterized in that: The sensing optical fiber (13) is externally fitted with a stainless steel flexible tube (14).

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