Inner leakage detection device for shell-and-tube heat exchanger

Abstract

The invention discloses a shell-and-tube heat exchanger inner leakage detection device which comprises a shell, a water-containing medium heat exchange cavity and a water-free medium cavity are arranged in the shell, a plurality of heat exchange tubes are arranged in the shell, the heat exchange tubes are communicated with the water-free medium cavity and penetrate through the water-containing medium heat exchange cavity, and the water-containing medium heat exchange cavity is communicated with the water-free medium cavity. A detection assembly is connected to the position, corresponding to the water-free medium cavity, of the shell, a detection cavity is formed in the detection assembly, the detection cavity is communicated with the water-free medium cavity, and therefore the fluid in the water-free medium cavity can enter the detection cavity. A detection material capable of changing color when encountering water is arranged in the detection cavity, and an observation window used for observing the interior of the detection cavity is formed in the detection assembly or the detection assembly is locally made of a light-transmitting material. The inner leakage detection device for the shell-and-tube heat exchanger is convenient to operate, visual, reliable and rapid in detection.

Description

Technical Field

[0001] The invention specifically relates to an internal leakage detection device for a shell and tube heat exchanger. Background Art

[0002] As a key heat exchange equipment, heat exchangers are widely used in various industrial fields such as chemical industry, petroleum, electricity, refrigeration, etc. Among them, shell and tube heat exchangers have become one of the most commonly used types of heat exchangers due to their compact structure, high heat transfer efficiency and strong adaptability. A traditional shell and tube heat exchanger generally includes a shell, a heat exchange cavity is provided in the shell, water vapor or water-containing heat exchange medium for heat exchange flows in the heat exchange cavity, a heat exchange tube is passed through the heat exchange cavity, the heat exchange tube is connected to the medium cavity for heat exchange and is absolutely sealed with the heat exchange cavity, that is, the medium in the heat exchange cavity and the medium in the heat exchange tube are absolutely sealed and do not intersect. For the specific structure, reference may be made to the patent scheme with patent number CN201811141329.4 and name of shell and tube heat exchanger. In actual use, the heat exchange tube inside the shell and tube heat exchanger may leak due to corrosion, wear, bursting, manufacturing defects and aging of component sealing performance, resulting in mixing of the two media, which not only affects the heat exchange efficiency, but also may cause serious safety hazards to the production process. When the heat exchanger leaks, it cannot be discovered in time, and the abnormality caused is further aggravated. When the loss is serious, it can be revealed that the equipment is damaged.

[0003] Therefore, there are some ways to monitor the internal leakage of heat exchangers in the existing market, but some existing feasible monitoring methods have some obvious limitations: this type of detection system requires a large number of control and detection components, such as temperature detection systems, pressure detection systems, humidity detection systems, etc., which are generally complex in structure, bulky in size, extremely expensive, and not very popularizable; the downtime cost is high, and the equipment usually needs to be stopped, which will cause production line interruptions, increase maintenance costs and time losses; detection is not timely, and conventional pressure tests can only detect larger-scale leaks, and it is difficult to capture tiny leaks in time, and they are often not discovered until the problem worsens; the operation is complicated, requires professional personnel, and there may be a risk of misjudgment.

[0004] The present invention is just produced based on the above-mentioned shortcomings. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a shell and tube heat exchanger internal leakage detection device which can be conveniently operated, intuitively reliable and quickly detected.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a shell and tube heat exchanger internal leakage detection device, comprising a shell, wherein an aqueous medium heat exchange cavity and an anhydrous medium cavity are arranged in the shell, wherein a plurality of heat exchange tubes are arranged in the shell, wherein the heat exchange tubes are connected with the anhydrous medium cavity and pass through the aqueous medium heat exchange cavity, so that the fluid in the anhydrous medium cavity exchanges heat with the aqueous medium heat exchange cavity, wherein a detection component is connected to the shell at a position corresponding to the anhydrous medium cavity, wherein a detection cavity is arranged in the detection component, which is connected with the anhydrous medium cavity and can allow the fluid in the anhydrous medium cavity to enter, wherein a detection material that can change color when encountering water is arranged in the detection cavity, wherein an observation window for observing the interior of the detection cavity is provided on the detection component, or the detection component is partially made of a light-transmitting material.

[0008] In the above-mentioned shell and tube heat exchanger internal leakage detection device, the detection material is cobalt-free color-changing silica gel.

[0009] As described above, the shell and tube heat exchanger internal leakage detection device, the detection component includes a connecting pipe connected to the shell and communicated with the water-free medium cavity, and a storage cylinder communicated with the connecting pipe. The storage cylinder is made of a transparent material, and the inner cavity of the storage cylinder constitutes the detection cavity.

[0010] In the shell and tube heat exchanger internal leakage detection device as described above, a switch valve for controlling the connection and disconnection of the connecting pipe and the storage cylinder is also provided between the connecting pipe and the storage cylinder.

[0011] In the shell and tube heat exchanger internal leakage detection device as described above, the top of the storage cylinder is provided with a perforated plate capable of sealing the detection cavity.

[0012] As described above, the shell and tube heat exchanger internal leakage detection device, the liquid outlet end of the switch valve is provided with a first flange, the top end of the storage cylinder is provided with a second flange matched with the first flange, the first flange is provided with a first groove, the second flange is provided with a second groove, and when the first flange and the second flange are covered and connected, the first groove and the second groove form a limiting cavity for accommodating the orifice plate.

[0013] The shell and tube heat exchanger internal leakage detection device as described above, the shell includes a heat exchange chamber shell located in the middle and closed at both ends, and a medium chamber shell connected to the front and rear ends of the heat exchange shell, the middle of the heat exchange tube passes through the inner cavity of the heat exchange chamber shell, and the two ends of the heat exchange tube extend to the two inner cavities of the medium chamber shells respectively, the rear half of the heat exchange chamber shell is provided with a water vapor inlet port, and the front half is provided with a water vapor outlet port, the medium chamber shell located at the front end of the heat exchange chamber shell is provided with a medium liquid inlet port, and the medium chamber shell located at the rear end of the heat exchange chamber shell is provided with a medium liquid outlet port, and the detection component is connected to the medium chamber shell located at the rear end of the heat exchange chamber shell and the detection component is connected to the bottom of the medium chamber shell.

[0014] The present invention also provides a better solution for a shell and tube heat exchanger internal leakage detection device, which is different from the above structure in that, in the shell and tube heat exchanger internal leakage detection device, the shell is provided with an RGB color sensor located on one side of the storage cylinder.

[0015] In the shell and tube heat exchanger internal leakage detection device as described above, the shell is provided with a control module electrically connected to the RGB color sensor, the control module is electrically connected to the wireless transmission module, and the shell is provided with an energy storage battery for supplying power to the control module and the RGB color sensor.

[0016] In the shell and tube heat exchanger internal leakage detection device as described above, the shell is provided with a power generation device in the anhydrous medium cavity, the power generation device includes a fan blade that can rotate when the fluid in the anhydrous medium cavity flows and a generator, and the generator is connected to the energy storage battery through wires.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The shell and tube heat exchanger of the present invention is connected with a detection component at a position corresponding to the anhydrous medium chamber. When water is mixed into the anhydrous medium chamber, it will enter the detection chamber 20 of the detection component 2, causing the color of the detection material therein to change. The operator can conveniently and intuitively obtain the color change of the detection material inside the detection chamber, thereby achieving the purpose of rapid detection. Its structure is simple and can be manufactured, replaced and maintained quickly and at low cost. It has strong scalability. At the same time, it does not require downtime for maintenance, thereby reducing maintenance costs and maintenance time losses. The operation difficulty is low, avoiding the risk of misjudgment due to improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram of a shell and tube heat exchanger of the present invention;

[0020] Figure 2 is a schematic cross-sectional view of a shell and tube heat exchanger of the present invention;

[0021] Figure 3 is a cross-sectional schematic diagram of a storage cylinder according to the first embodiment of the present invention;

[0022] Figure 4 is a cross-sectional schematic diagram of a storage cylinder according to a second embodiment of the present invention;

[0023] Figure 5 It is a partial cross-sectional schematic diagram of a shell and tube heat exchanger according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0024] The invention will be further described below in conjunction with the accompanying drawings:

[0025] The directions described in the specification of the present invention, such as "up", "down", "left", "right", "front", "back", etc., are based on the directions of the drawings and are intended to facilitate the description of the relationship between the various components. They do not indicate the unique or absolute positional relationship between the various components. They are only one of the implementation methods of the invention and are not a limitation on its implementation method.

[0026] Embodiment 1

[0027] like Figure 1 As shown, in this embodiment, a shell and tube heat exchanger internal leakage detection device is provided, which includes a shell 1, and the shell 1 is composed of a heat exchange chamber shell 101 located in the middle and closed at both ends, and a medium chamber shell 102 connected to the front and rear ends of the heat exchange shell. Figure 1 and Figure 2 As shown, the two medium housings 102 are respectively a medium housing 102a located at the front side of the heat exchange housing 101 and a medium housing 102b located at the rear side of the heat exchange housing 101. Figure 2 As shown, the shell 1 is provided with an aqueous medium heat exchange chamber 11 and an anhydrous medium chamber 12, wherein the aqueous medium heat exchange chamber 11 is the inner chamber of the heat exchange chamber shell 101, the heat exchange chamber shell 101 is closed at both ends, and the heat exchange chamber shell 101 is provided with an inlet and outlet for circulating water vapor, the medium chamber shell 102b and the side wall of the heat exchange chamber shell 101 form an anhydrous medium chamber 12, and the two ends of the heat exchange tube 13 are connected to the two anhydrous medium chambers 12, and the two anhydrous medium chambers 12 are respectively provided with inlets and outlets for the circulation of the medium that needs heat exchange, and the medium generally does not contain water. In this embodiment, the two anhydrous medium chambers 12 are respectively provided at the front and rear ends of the shell 1, but in actual applications, four anhydrous medium chambers 12 or more can also be provided, as long as the medium can circulate through the heat exchange tube 13. In actual applications, even one anhydrous medium chamber 12 can also be provided, and the heat exchange tube 13 is made into a U-shape and the two ends are folded back to the anhydrous medium chamber 12, so that the medium can circulate through the heat exchange tube 13. As shown Figure 2 As shown, a plurality of heat exchange tubes 13 are provided in the shell 1 , which are connected to the anhydrous medium cavity 12 and pass through the aqueous medium heat exchange cavity 11 , so that the fluid in the anhydrous medium cavity 12 exchanges heat with the aqueous medium heat exchange cavity 11 .

[0028] like Figure 1 and Figure 2As shown, the housing 1 is connected with a detection component 2 at a position corresponding to the anhydrous medium cavity 12, and the detection component 2 is provided with a detection cavity 20 that is connected to the anhydrous medium cavity 12 and can allow the fluid of the anhydrous medium cavity 12 to enter, and the detection cavity 20 is arranged with a detection material 3 that can change color when encountering water, and the detection component 2 is provided with an observation window for observing the inside of the detection cavity 20 or the detection component 2 is partially made of a light-transmitting material. In this embodiment, the detection material 3 uses cobalt-free color-changing silica gel, which has an orange-yellow appearance, and its main component is silicon dioxide. The color changes with humidity. It is orange-yellow when not damp, and gradually turns green and dark green as the water absorbed by itself increases. It has the advantages of not containing cobalt chloride, being non-toxic and harmless. Of course, the detection material 3 can also use other non-toxic and environmentally friendly substitutes such as cobalt chloride or other non-toxic and environmentally friendly substitutes. Through the above structure, the operator can conveniently and intuitively obtain the color change of the detection material 3 inside the detection cavity 20, thereby achieving the purpose of rapid detection.

[0029] In detail, Figure 2 As shown, the detection assembly 2 includes a connecting tube 21 connected to the housing 1 and communicating with the anhydrous medium chamber 12, and a storage cylinder 22 communicating with the connecting tube 21. The storage cylinder 22 is made of a transparent material, and the inner cavity of the storage cylinder 22 constitutes the detection chamber 20. Figure 3 As shown, the entire storage tube 22 is made of a transparent material such as high borosilicate glass to facilitate observation of the interior of the detection cavity 20.

[0030] As a preferred solution, Figure 2 As shown, a switch valve 23 for controlling the connection and disconnection of the connecting pipe 21 and the storage cylinder 22 is provided between the connecting pipe 21 and the storage cylinder 22, and is used to control whether the connecting pipe 21 is connected to the storage cylinder 22. In this way, by closing the switch valve 23, the connecting pipe 21 can be activated, repaired, and parts replaced without stopping the machine.

[0031] As a preference, Figure 2As shown, the top of the storage tube 22 is provided with an orifice plate 24 capable of closing the detection chamber 20, and the orifice plate 24 seals the detection material 3 in the inner cavity of the storage tube 22. The orifice plate 24 is a plate with multiple small holes, or a screen with holes. In detail, the liquid outlet end of the switch valve 23 is provided with a first flange 231, and the top of the storage tube 22 is provided with a second flange 221 matched with the first flange 231. The first flange 231 is provided with a first groove 232, and the second flange 221 is provided with a second groove 222. After the first flange 231 and the second flange 221 are covered and connected, the first flange 231 and the second flange 221 are covered and connected and fixed by bolts and nuts. The first groove 232 and the second groove 222 surround a limiting cavity for accommodating the orifice plate 24, so as to facilitate the removal and replacement of the storage tube 22 and the fixing and replacement of the orifice plate 24.

[0032] In detail, Figure 1 and Figure 2 As shown, the shell 1 includes a heat exchange chamber shell 101 located in the middle and closed at both ends, and a medium chamber shell 102 connected to the front and rear ends of the heat exchange chamber shell. The two medium chamber shells 102 are respectively a medium chamber shell 102a located at the front side of the heat exchange chamber shell 101 and a medium chamber shell 102b located at the rear side of the heat exchange chamber shell 101. The water-containing medium heat exchange cavity 11 is the inner cavity of the heat exchange chamber shell 101. The medium chamber shell 102b and the side wall of the heat exchange chamber shell 101 form a water-free medium cavity 12. The middle part of the heat exchange tube 13 passes through the inner cavity of the heat exchange chamber shell 101, and the two ends of the heat exchange tube 13 extend to the inner cavities of the two medium chamber shells 102 respectively. The rear half of the heat exchange chamber shell 101 is provided with a water vapor inlet port 14, a front A water vapor discharge port 15 is provided in the half part, a medium storage shell 102 located at the front end of the heat exchange storage shell 101 is provided with a medium liquid inlet 16, and a medium storage shell 102 located at the rear end of the heat exchange storage shell 101 is provided with a medium liquid discharge port 17, which is beneficial to improving the heat exchange efficiency. The detection component 2 is connected to the medium storage shell 102 located at the rear end of the heat exchange storage shell 101 and the detection component 2 is connected to the bottom of the medium storage shell 102, so that the water involved in the whole circulation process of the medium requiring heat exchange can be detected near the medium liquid discharge port 17, and the detection component 2 is connected to the bottom of the medium storage shell 102, which is beneficial to keep the fluid in the waterless medium cavity 12 flowing into the detection cavity 20.

[0033] Embodiment 2

[0034] In this embodiment, a shell and tube heat exchanger internal leakage detection device is provided, which is different from the first embodiment in that the storage cylinder 22 is not a completely transparent structure, but a transparent observation window 223 for observing the inside of the detection cavity 20 is provided on the side wall of the storage cylinder 22.

[0035] Embodiment 3

[0036] In this embodiment, a shell and tube heat exchanger internal leakage detection device is provided, which is different from the first embodiment in that Figure 5 As shown, the housing 1 is provided with an RGB color sensor 25 located on one side of the storage tube 22, wherein the RGB color sensor 25 is usually equipped with one or more LED light sources 252 for illuminating the object to be measured. These LEDs can emit red, green and blue light, and sometimes include white light as a reference light source, and are also equipped with a photodetector 251. The sensor contains three independent photodiodes or other types of photosensitive elements, corresponding to red, green and blue respectively. When light hits the object and is reflected back to the sensor, each photodetector generates a corresponding electrical signal according to the received light intensity. The RGB color sensor 2 can be used to connect to a computer or other device to obtain a detection signal, so that the color change of the detection material 3 in the storage tube 22 can be detected in real time.

[0037] As a preference, Figure 5 As shown, the housing 1 is provided with a control module 26 electrically connected to the RGB color sensor, and the control module 26 is electrically connected to a wireless transmission module 27. The housing 1 is provided with an energy storage battery 28 for powering the control module 26 and the RGB color sensor 25. Then, the color change of the detection material 3 in the storage tube 22 can be continuously detected through the RGB color sensor 25, and the signal is transmitted to the control module 26 and integrated into readable information. The control module 26 then transmits the information to the Internet through the wireless transmission module 27 for remote equipment to read, thereby realizing wireless remote detection.

[0038] As a preference, in order to increase the continuous working time of the energy storage battery 28 of the system, as Figure 5 As shown, the shell 1 is provided with a power generation device in the anhydrous medium chamber 12, and the power generation device includes a fan blade that can rotate when the fluid in the anhydrous medium chamber 12 flows and a generator. The generator is connected to the energy storage battery through an electric wire, and the electric wire passes through the medium chamber shell 102b and is connected to the energy storage battery 28, wherein the position where the electric wire passes is sealed by a sealing ring, glue, etc.

[0039] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A shell and tube heat exchanger internal leakage detection device, comprising a shell (1), wherein the shell (1) is provided with an aqueous medium heat exchange chamber (11) and an anhydrous medium chamber (12), wherein the shell (1) is provided with a plurality of heat exchange tubes (13), wherein the heat exchange tubes (13) are communicated with the anhydrous medium chamber (12) and the heat exchange tubes (13) pass through the aqueous medium heat exchange chamber (11), so that the fluid in the anhydrous medium chamber (12) exchanges heat with the aqueous medium heat exchange chamber (11), characterized in that: A detection component (2) is connected to the housing (1) at a position corresponding to the anhydrous medium cavity (12); a detection cavity (20) is provided in the detection component (2) and is in communication with the anhydrous medium cavity (12) so as to allow fluid in the anhydrous medium cavity (12) to enter; a detection material (3) that changes color when exposed to water is arranged in the detection cavity (20); an observation window for observing the interior of the detection cavity (20) is provided on the detection component (2), or the detection component (2) is partially made of a light-transmitting material.

2. The shell and tube heat exchanger internal leakage detection device according to claim 1, characterized in that: The detection material (3) is cobalt-free color-changing silica gel.

3. The shell and tube heat exchanger internal leakage detection device according to claim 1, characterized in that: The detection assembly (2) comprises a connecting tube (21) connected to the housing (1) and in communication with the anhydrous medium chamber (12), and a storage tube (22) in communication with the connecting tube (21); the storage tube (22) is made of a transparent material, and the inner cavity of the storage tube (22) constitutes the detection chamber (20).

4. The shell and tube heat exchanger internal leakage detection device according to claim 3, characterized in that: A switch valve (23) for controlling the connection between the connecting pipe (21) and the storage cylinder (22) is also provided between the connecting pipe (21) and the storage cylinder (22).

5. The shell and tube heat exchanger internal leakage detection device according to claim 4, characterized in that: The top of the storage cylinder (22) is provided with a hole plate (24) capable of sealing the detection cavity (20).

6. The shell and tube heat exchanger internal leakage detection device according to claim 5, characterized in that: The liquid outlet end of the switch valve (23) is provided with a first flange (231), the top end of the storage cylinder (22) is provided with a second flange (221) matched with the first flange (231), the first flange (231) is provided with a first groove (232), the second flange (221) is provided with a second groove (222), and when the first flange (231) and the second flange (221) are covered and connected, the first groove (232) and the second groove (222) form a limiting cavity for accommodating the orifice plate (24).

7. The shell and tube heat exchanger internal leakage detection device according to claim 1, characterized in that: The shell (1) comprises a heat exchange chamber shell (101) located in the middle and closed at both ends, and a medium chamber shell (102) connected to the front and rear ends of the heat exchange chamber shell; the middle of the heat exchange tube (13) passes through the inner cavity of the heat exchange chamber shell (101), and the two ends of the heat exchange tube (13) extend to the inner cavities of the two medium chamber shells (102) respectively; the rear half of the heat exchange chamber shell (101) is provided with a water vapor inlet port (14), and the front half is provided with a water vapor outlet port (15); the medium chamber shell (102) located at the front end of the heat exchange chamber shell (101) is provided with a medium liquid inlet port (16), and the medium chamber shell (102) located at the rear end of the heat exchange chamber shell (101) is provided with a medium liquid outlet port (17); the detection component (2) is connected to the medium chamber shell (102) located at the rear end of the heat exchange chamber shell (101), and the detection component (2) is connected to the bottom of the medium chamber shell (102).

8. The shell and tube heat exchanger internal leakage detection device according to claim 3, characterized in that: The housing (1) is provided with an RGB color sensor (25) located on one side of the storage cylinder (22).

9. The shell and tube heat exchanger internal leakage detection device according to claim 8, characterized in that: The housing (1) is provided with a control module (26) electrically connected to the RGB color sensor (25), the control module (26) is electrically connected to a wireless transmission module (27), and the housing (1) is provided with an energy storage battery (28) for supplying power to the control module (26) and the RGB color sensor (25).

10. The shell and tube heat exchanger internal leakage detection device according to claim 9, characterized in that: The housing (1) is provided with a power generation device (29) in the anhydrous medium chamber (12). The power generation device (29) includes a fan blade (291) that can rotate when fluid flows in the anhydrous medium chamber (12) and a generator (292). The generator (292) is connected to the energy storage battery (28) via an electric wire.

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