Anti-clogging winding pipe type heat exchanger for ethanol device

Abstract

The utility model relates to the field of chemical equipment, and particularly discloses an anti-clogging winding tube type heat exchanger for an ethanol device, which comprises a first-stage heat exchanger, a second-stage heat exchanger and a filter, and the first-stage heat exchanger comprises a first-stage tube pass inlet and a first-stage tube pass outlet; the second-stage heat exchanger comprises a second-stage tube pass inlet and a second-stage tube pass outlet. The filter is arranged below the first-stage heat exchanger and communicated with the bottom of the first-stage heat exchanger, and the first-stage tube pass inlet is formed in the filter and communicated with the interior of the filter. When the cleanliness of a tube pass medium entering the first-stage heat exchanger and the second-stage heat exchanger is not pure, the filter can filter impurities in the tube pass medium, the possibility that the impurities enter the first-stage heat exchanger and the second-stage heat exchanger to block the tube pass medium is reduced, and due to the flow direction design of the first-stage heat exchanger and the second-stage heat exchanger, the heat exchange efficiency is improved. And the risk that heavy metal objects are polymerized and blocked in the heat exchanger is avoided, so that the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of chemical equipment, and in particular to an anti-clogging wound tube heat exchanger for an ethanol device. Background Art

[0002] In the production process of ethanol, different media need to be cooled or heated to achieve the reaction or product separation. Heat exchangers can cool high-temperature media or heat low-temperature media by heat transfer to meet the temperature requirements of the production process.

[0003] Wound tube heat exchangers and shell-and-tube heat exchangers are commonly used heat exchangers in ethanol production. Wound tube heat exchangers are different from ordinary shell-and-tube heat exchangers. Due to the spiral winding characteristics of the heat exchange tube, the structure is compact and the heat exchange efficiency per unit area is high. Since the heat exchange tube can be increased by adjusting the spiral angle, the shell size of the heat exchanger can be reduced under the condition of the same heat transfer efficiency. Therefore, it has the advantages of small footprint, light weight, and investment saving. At the same time, it is resistant to high temperature and high pressure, and can be designed with multiple streams to meet the effect of simultaneous heat exchange of multiple fluids in one device.

[0004] Although the wound tube heat exchanger has so many advantages, due to its structural characteristics, it has high requirements for the cleanliness of the process medium. Once there are many impurities in the raw materials in the process system, it is easy to cause blockage. As time goes by, the channel blockage will become more and more serious, the pressure drop will seriously exceed the standard, and the work efficiency will be greatly reduced.

[0005] Especially for the methyl acetate-crude alcohol heat exchanger in the ethanol unit, the traditional device uses a single-stream wound tube heat exchanger, with the flow direction of hydrogen and methyl acetate in the tube side media being bottom-in and top-out, and the flow direction of crude alcohol in the shell side media being top-in and bottom-out. Since the inlet of the tube side medium is gas-liquid two-phase, and the outlet is gas phase. In addition, there is a risk of heavy metal precipitation and polymerization in the process system, which can easily lead to heavy metal polymerization and blockage at the outlet of the tube side of the wound tube heat exchanger, seriously affecting the heat transfer efficiency and resistance drop. If the inlet flow direction of the tube side is directly changed to top-in and bottom-out, the gas-liquid two-phase fluid will have a plunger flow in the tube, seriously affecting the heat transfer efficiency. Utility Model Content

[0006] In order to reduce the possibility of blockage of the heat exchanger and extend the service life of the heat exchanger, the present application provides an anti-blockage wound tube heat exchanger for an ethanol device.

[0007] The present application provides an anti-clogging wound tube heat exchanger for an ethanol device, which adopts the following technical solution:

[0008] A plug-resistant wound tube heat exchanger for an ethanol device, comprising a first-stage heat exchanger, a second-stage heat exchanger and a filter, wherein the first-stage heat exchanger comprises a first-stage tube inlet and a first-stage tube outlet arranged at the top of the first-stage heat exchanger, and the second-stage heat exchanger comprises a second-stage tube inlet arranged at the top of the second-stage heat exchanger and a second-stage tube outlet arranged at the bottom of the second-stage heat exchanger;

[0009] The first-stage tube side outlet and the second-stage tube side inlet are connected to each other, the filter is arranged below the first-stage heat exchanger and is connected to the bottom of the first-stage heat exchanger, and the first-stage tube side inlet is arranged on the filter and is connected to the inside of the filter;

[0010] The first-stage heat exchanger is a phase change zone, the second-stage heat exchanger is a gas phase heat exchange zone, and the medium flow direction of the first-stage heat exchanger is bottom-in and top-out, while the medium flow direction of the second-stage heat exchanger is top-in and bottom-out.

[0011] By adopting the above technical solution, when the cleanliness of the tube-side medium entering the first-stage heat exchanger and the second-stage heat exchanger is impure, the filter can filter the impurities in the tube-side medium, reducing the possibility of impurities entering the first-stage heat exchanger and the second-stage heat exchanger and clogging them. At the same time, the flow direction design of the first-stage heat exchanger and the second-stage heat exchanger avoids the risk of heavy metal aggregation and clogging in the heat exchanger, thereby improving the heat exchange efficiency.

[0012] Optionally, the bottom of the first-stage heat exchanger is connected to a tube box cylinder, the filter includes a filter screen, a cylindrical support rod, a spiral blade, a booster blade and a cleaning brush, the filter screen is movably inserted into the tube box cylinder, a plurality of mesh holes are provided on the side wall of the filter screen near the top, a distribution orifice plate is provided on the top of the filter screen, a plurality of sieve holes are provided on the distribution orifice plate, and a connection structure for connection and fixing is provided between the bottom of the filter screen and the tube box cylinder;

[0013] The pipe box cylinder and the filter screen are respectively provided with eccentric holes of the same angle, the pipe connection port of the first-stage pipe inlet is connected with the eccentric hole of the pipe box cylinder, and the filter screen inlet is provided at the eccentric hole of the side wall of the filter screen;

[0014] The cylindrical support rod is rotatably installed in the filter screen, the spiral blade is installed along the rod body of the cylindrical support rod and is installed outside the cylindrical support rod, the booster blade is circumferentially installed on the cylindrical support rod, and the height is consistent with the height of the filter screen inlet, the cleaning brush is installed on the cylindrical support rod, and the bristles of the cleaning brush are directly opposite to each of the mesh holes and each of the sieve holes.

[0015] By adopting the above technical solution, the medium enters the equipment through the first-stage pipe inlet. Since the gap between the filter screen and the tube box cylinder is relatively small, most of the medium directly enters the filter from the filter screen inlet. The fluid's own bias flow impacts the booster blades, driving the booster blades to rotate, and then rotates along the spiral blades. Through the double reinforcement of the booster blades and the spiral blades, the fluid forms a turbulent flow in the filter, and the flow rate does not decrease.

[0016] Due to the characteristics of the spiral blades, the medium will flow upward and enter the upper space of the tube box cylinder through the mesh holes of the filter screen and the sieve holes of the distribution orifice plate. The impurities in the medium will be blocked by the mesh holes of the filter screen and the sieve holes of the distribution orifice plate.

[0017] The filtered medium enters the upper tube box at the top of the first-stage heat exchanger after passing through the heat exchange tubes in the first-stage heat exchanger, then flows out of the first-stage heat exchanger from the first-stage tube side outlet, and then enters the second-stage heat exchanger from the second-stage tube side inlet.

[0018] When the medium passes through the first stage heat exchanger and the second stage heat exchanger, the medium exchanges heat through the heat exchange tube. At the same time, the rotation of the cleaning brush will scrape off the impurities attached to the filter screen and the distribution plate. You only need to clean the filter regularly.

[0019] Optionally, the filter further comprises two frictionless bearings coaxially sleeved on both ends of the cylindrical support rod.

[0020] By adopting the above technical solution, the frictionless bearing can reduce the friction when the cylindrical support rod rotates, so that the cylindrical support rod can rotate more smoothly in coordination with the bolt blade and the booster blade.

[0021] Optionally, the connection structure includes a flange, a flange cover, and a bolt assembly, wherein the flange is fixed to a side wall of the tube box cylinder near the bottom, the flange cover is arranged at the bottom of the filter screen, and the bolt assembly is used to fix the flange and the flange cover together;

[0022] One of the frictionless bearings is fixedly connected to the distribution orifice plate, and the other frictionless bearing is fixedly connected to the flange cover. An impurity storage bin is formed between the filter screen and the flange cover, and a pipe box cavity is formed between the pipe box cylinder and the distribution orifice plate.

[0023] By adopting the above technical solution, when the filter needs to be cleaned, it is only necessary to disassemble the bolt assembly to separate the flange and the flange cover from each other. At this time, the filter can be cleaned by removing the filter, which is convenient for repeated use of the filter.

[0024] Optionally, a connecting pipe for communication is provided between the first-stage pipe-side outlet and the second-stage pipe-side inlet, and the connecting pipe is detachably provided between the first-stage pipe-side outlet and the second-stage pipe-side inlet.

[0025] By adopting the above technical solution, when the first-stage heat exchanger and the second-stage heat exchanger fail or need maintenance, the first-stage heat exchanger and the second-stage heat exchanger can be separated from each other through the connecting pipe, so as to facilitate separate replacement or maintenance.

[0026] Optionally, the second-stage tube-side outlet is arranged on the side wall of the second-stage heat exchanger close to the bottom, and the second-stage tube-side outlet is arranged horizontally.

[0027] By adopting the above technical solution, impurities in the medium fall freely under the action of gravity, and the medium can be smoothly discharged from the horizontally arranged second-stage pipe outlet, which facilitates the separation of the medium and impurities.

[0028] Optionally, a collecting tank for temporarily storing impurities is provided at the bottom of the second-stage heat exchanger, and a discharge structure for cleaning impurities in the collecting tank is provided at the bottom of the collecting tank.

[0029] By adopting the above technical solution, the collecting tank can temporarily collect the impurities separated from the medium, and when the impurities need to be cleaned, the impurities can be cleaned through the discharge structure.

[0030] Optionally, the discharge structure includes a hand hole opened at the bottom of the second-stage heat exchanger, and the hand hole is removably sealed with a sealing plug.

[0031] By adopting the above technical solution, when the accumulated impurities need to be cleaned, the sealing plug can be pulled out from the hand hole, so that the accumulated impurities can be quickly cleaned.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. Make full use of the physical properties of the medium and reasonably design the flow direction of the equipment to allow impurities to precipitate automatically;

[0034] 2. Make full use of the internal space of the pipe box without increasing the land cost;

[0035] 3. Make full use of its own media to drive the filter to rotate without increasing additional motor operating costs;

[0036] 4. Filtering out impurities in the raw medium can effectively prevent scaling, which can not only extend the service life of the heat exchanger but also reduce investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a schematic diagram of the overall structure of a conventional wound heat exchanger;

[0039] Figure 2 It is a schematic diagram of the overall structure of the anti-clogging wound tube heat exchanger used in the ethanol device in the present application;

[0040] Figure 3 yes Figure 2 Schematic diagram of part of the structure of the filter;

[0041] Figure 4 yes Figure 3 Schematic diagram of the structure of the two ends of the filter.

[0042] Figure numerals: 1. first-stage pipe outlet; 2. heat exchange tube; 3. distribution orifice plate; 4. sieve hole; 5. filter screen; 6. mesh; 7. cylindrical support rod; 8. spiral blade; 9. booster blade; 10. flange; 11. flange cover; 12. bolt assembly; 13. frictionless bearing; 14. impurity storage bin; 15. first-stage pipe inlet; 16. filter screen inlet; 17. pipe box cylinder; 18. cleaning brush; 19. pipe box cavity; 20. tube sheet; 21. shell outlet; 22. shell inlet; 23. second-stage pipe inlet; 24. second-stage pipe outlet; 25. hand hole; 26. first-stage heat exchanger; 27. second-stage heat exchanger. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-4 , further details of this application are given.

[0044] The embodiment of the present application discloses a plugging-resistant wound tube heat exchanger for an ethanol device.

[0045] A plug-resistant spiral wound tube heat exchanger for an ethanol plant, referring to Figure 1 and Figure 2 , including a first-stage heat exchanger 26, a second-stage heat exchanger 27 and a filter, the first-stage heat exchanger 26 including a first-stage tube-side inlet 15 and a first-stage tube-side outlet 1 arranged at the top of the first-stage heat exchanger 26, the second-stage heat exchanger 27 including a second-stage tube-side inlet 23 arranged at the top of the second-stage heat exchanger 27 and a second-stage tube-side outlet 24 arranged at the bottom of the second-stage heat exchanger 27;

[0046] The first-stage pipe-side outlet 1 and the second-stage pipe-side inlet 23 are connected to each other, and a connecting pipe for communication is provided between them. The connecting pipe is detachably provided between the first-stage pipe-side outlet 1 and the second-stage pipe-side inlet 23 .

[0047] Reference Figure 2 The second-stage tube outlet 24 is arranged on the side wall of the second-stage heat exchanger 27 near the bottom, and the second-stage tube outlet 24 is arranged horizontally. A collecting tank for temporarily storing impurities is arranged at the bottom of the second-stage heat exchanger 27, and a discharge structure for cleaning the impurities in the collecting tank is arranged at the bottom of the collecting tank. The discharge structure includes a hand hole 25 opened at the bottom of the second-stage heat exchanger 27, and a sealing plug is removably sealed on the hand hole 25.

[0048] The filter is disposed below the first-stage heat exchanger 26 and communicated with the bottom of the first-stage heat exchanger 26 . The first-stage tube-side inlet 15 is disposed on the filter and communicated with the interior of the filter.

[0049] Reference Figure 1 and Figure 2 The structure of a conventional wound heat exchanger includes a shell, a first-stage tube side inlet 15, a tube sheet 20, a first-stage tube side outlet 1, a shell side inlet 22, a shell side outlet 21 and a heat exchange tube 2. The first-stage tube side inlet 15 is opened at the bottom of the shell, the tube sheet 20 is arranged in the shell and is located near the first-stage tube side inlet 15, the first-stage tube side outlet 1 is opened at the top of the shell, the shell side inlet 22 is arranged on the side wall near the bottom of the shell, the shell side outlet 21 is arranged on the side wall near the top of the shell, and the heat exchange tube 2 is wound inside the shell.

[0050] Figure 1 The cold fluid in the middle tube side directly enters through the first tube side inlet 15 at the bottom, flows through the heat exchange tube 2 and flows out of the shell from the first tube side outlet 1, and the hot fluid in the shell side enters from the shell side inlet 22 and flows out from the shell side outlet 21. If the cleanliness of the tube side medium is impure, the gas-solid separation caused by the increase in medium temperature and the downward deposition of solid impurities will cause the tube sheet 20 and the tube holes of the heat exchange tube 2 to be blocked.

[0051] It can be seen from this that the ordinary wound heat exchanger has the defect that impurities are easily blocked, so it needs to be improved. The heat exchanger in this application is two-stage series, the first-stage heat exchanger 26 is the phase change zone, and the second-stage heat exchanger 27 is the gas phase heat exchange zone;

[0052] The first-stage medium flows from the bottom to the top, entering the filter from the first-stage tube inlet 15, filtering the impurities in the medium through the filter, and then passing through the filter into the heat exchange tube 2 of the first-stage heat exchanger 26 to exchange heat with the medium;

[0053] Then it flows into the second-stage tube side inlet 23 of the second-stage heat exchanger 27 through the first-stage tube side outlet 1, and the tube side medium changes from gas-liquid two-phase to pure gas phase. The medium finally flows out of the shell from the second-stage tube side outlet 24 of the second-stage heat exchanger 27. The second-stage medium flows from top to bottom to avoid heavy metal polymers clogging the heat exchange tube 2. Impurities fall to the bottom of the second-stage heat exchanger 27 due to their own gravity.

[0054] Specifically, refer to Figure 2 , Figure 3 and Figure 4 The bottom of the first-stage heat exchanger 26 is connected to a tube box cylinder 17, and the filter includes a filter screen 5, a cylindrical support rod 7, a spiral blade 8, a booster blade 9 and a cleaning brush 18. The filter screen 5 is movably inserted in the tube box cylinder 17, and a plurality of mesh holes 6 are provided on the side wall of the filter screen 5 near the top. A distribution orifice plate 3 is provided on the top of the filter screen 5, and a plurality of sieve holes 4 are provided on the distribution orifice plate 3. A connection structure for connection and fixing is provided between the bottom of the filter screen 5 and the tube box cylinder 17;

[0055] Reference Figure 2 , Figure 3 and Figure 4 The connection structure includes a flange 10, a flange cover 11, and a bolt assembly 12. The flange 10 is fixed to the side wall of the pipe box cylinder 17 near the bottom. The flange cover 11 is arranged at the bottom of the filter screen 5. The bolt assembly 12 is used to fix the flange 10 and the flange cover 11. Specifically, the bolt assembly 12 includes bolts and nuts, which are used to connect and fix the flange 10 and the flange cover 11.

[0056] Eccentric holes with the same angle are respectively provided on the pipe box cylinder 17 and the filter screen 5. The pipe connection port of the first-stage pipe pass inlet 15 is connected to the eccentric hole of the pipe box cylinder 17. A filter screen inlet 16 is provided at the eccentric hole on the side wall of the filter screen 5, and the aperture of the filter screen inlet 16 is slightly larger than the pipe connection port of the first-stage pipe pass inlet 15.

[0057] The medium enters the device through the first-stage pipe inlet 15. Since the gap between the filter screen 5 and the pipe box cylinder 17 is relatively small, most of the medium directly enters the filter from the filter screen inlet 16.

[0058] The cylindrical support rod 7 is rotatably installed in the filter screen 5, the spiral blade 8 is installed along the rod body of the cylindrical support rod 7 and is installed outside the cylindrical support rod 7, the booster blade 9 is installed on the cylindrical support rod 7 along the circumferential direction, and the height is consistent with the height of the filter screen inlet 16, and the cleaning brush 18 is installed on the cylindrical support rod 7, and the bristles of the cleaning brush 18 are directly opposite to each mesh 6 and each sieve hole 4.

[0059] Reference Figure 2 and Figure 3The filter also includes two frictionless bearings 13 coaxially sleeved at both ends of the cylindrical support rod 7, one frictionless bearing 13 is fixedly connected to the distribution orifice plate 3, and the other frictionless bearing 13 is fixedly connected to the flange cover 11. An impurity storage bin 14 is formed between the filter screen 5 and the flange cover 11, and a pipe box cavity 19 is formed between the pipe box cylinder 17 and the distribution orifice plate 3.

[0060] The fluid's own biased flow impacts the booster blade 9, driving the booster blade 9 to rotate, and then rotates along the spiral blade 8. Through the double reinforcement of the booster blade 9 and the spiral blade 8, the fluid forms a turbulent flow in the filter, and the flow rate does not decrease.

[0061] Due to the characteristics of the spiral blades 8, the medium will flow upward and enter the pipe box cavity 19 through the mesh holes 6 of the filter screen 5 and the sieve holes 4 of the distribution orifice plate 3. Impurities in the medium will be blocked by the mesh holes 6 of the filter screen 5 and the sieve holes 4 of the distribution orifice plate 3.

[0062] The filtered medium then enters the upper pipe box through the heat exchange tube 2 and flows out of the shell from the first stage tube outlet 1, and at the same time exchanges heat with the medium flowing from the shell inlet 22 through the shell cavity and out of the shell outlet 21 through the heat exchange tube 2.

[0063] At the same time, the rotation of the cleaning brush 18 will scrape off the impurities attached to the filter screen 5 and the distribution orifice plate 3, causing the impurities to fall into the impurity storage bin 14 below. It is only necessary to clean the filter regularly, and when cleaning, it is only necessary to disassemble the bolt assembly 12 and take out the filter for cleaning.

[0064] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A plug-resistant wound tube heat exchanger for an ethanol plant, characterized in that: The invention comprises a first-stage heat exchanger (26), a second-stage heat exchanger (27), and a filter, wherein the first-stage heat exchanger (26) comprises a first-stage tube-side inlet (15) and a first-stage tube-side outlet (1) arranged at the top of the first-stage heat exchanger (26), and the second-stage heat exchanger (27) comprises a second-stage tube-side inlet (23) arranged at the top of the second-stage heat exchanger (27) and a second-stage tube-side outlet (24) arranged at the bottom of the second-stage heat exchanger (27); The first-stage tube side outlet (1) and the second-stage tube side inlet (23) are in communication with each other, the filter is arranged below the first-stage heat exchanger (26) and is in communication with the bottom of the first-stage heat exchanger (26), and the first-stage tube side inlet (15) is arranged on the filter and is in communication with the interior of the filter; The first-stage heat exchanger (26) is a phase change zone, the second-stage heat exchanger (27) is a gas phase heat exchange zone, and the medium flow direction of the first-stage heat exchanger (26) is bottom-in and top-out, while the medium flow direction of the second-stage heat exchanger (27) is top-in and bottom-out.

2. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 1, characterized in that: The bottom of the first-stage heat exchanger (26) is connected to a tube box cylinder (17), the filter comprises a filter screen (5), a cylindrical support rod (7), a spiral blade (8), a booster blade (9) and a cleaning brush (18), the filter screen (5) is movably inserted into the tube box cylinder (17), a plurality of mesh holes (6) are provided on the side wall of the filter screen (5) near the top, a distribution orifice plate (3) is provided on the top of the filter screen (5), a plurality of sieve holes (4) are provided on the distribution orifice plate (3), and a connection structure for connection and fixing is provided between the bottom of the filter screen (5) and the tube box cylinder (17); The pipe box cylinder (17) and the filter screen (5) are respectively provided with eccentric holes with the same angle, the pipe connection port of the first-stage pipe inlet (15) is connected to the eccentric hole of the pipe box cylinder (17), and a filter screen inlet (16) is provided at the eccentric hole of the side wall of the filter screen (5); The cylindrical support rod (7) is rotatably mounted in the filter screen (5); the spiral blade (8) is wound around the rod body of the cylindrical support rod (7) and mounted outside the cylindrical support rod (7); the booster blade (9) is circumferentially mounted on the cylindrical support rod (7) and has a height that is consistent with the height of the filter screen inlet (16); the cleaning brush (18) is mounted on the cylindrical support rod (7), and the bristles of the cleaning brush (18) are directly opposite to each mesh hole (6) and each sieve hole (4).

3. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 2, characterized in that: The filter further comprises two frictionless bearings (13) coaxially sleeved on both ends of the cylindrical support rod (7).

4. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 3, characterized in that: The connection structure comprises a flange (10), a flange cover (11), and a bolt assembly (12); the flange (10) is fixed to a side wall of the pipe box cylinder (17) close to the bottom; the flange cover (11) is arranged at the bottom of the filter screen (5); and the bolt assembly (12) is used to fix the flange (10) and the flange cover (11) together; One of the frictionless bearings (13) is fixedly connected to the distribution orifice plate (3), and the other frictionless bearing (13) is fixedly connected to the flange cover (11). An impurity storage bin (14) is formed between the filter screen (5) and the flange cover (11), and a pipe box cavity (19) is formed between the pipe box cylinder (17) and the distribution orifice plate (3).

5. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 1, characterized in that: A connecting pipe for communication is provided between the first-stage pipe-side outlet (1) and the second-stage pipe-side inlet (23); the connecting pipe is detachably provided between the first-stage pipe-side outlet (1) and the second-stage pipe-side inlet (23).

6. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 2, characterized in that: The second-stage tube-side outlet (24) is arranged on a side wall of the second-stage heat exchanger (27) close to the bottom, and the second-stage tube-side outlet (24) is arranged in a horizontal direction.

7. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 1, characterized in that: A collecting tank for temporarily storing impurities is provided at the bottom of the second-stage heat exchanger (27), and a discharge structure for cleaning impurities in the collecting tank is provided at the bottom of the collecting tank.

8. The anti-clogging wound tube heat exchanger for an ethanol device according to claim 7, characterized in that: The discharge structure comprises a hand hole (25) opened at the bottom of the second-stage heat exchanger (27), and the hand hole (25) is provided with a removable sealing plug.

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