Waste heat recovery device for edible alcohol distillation equipment

Abstract

The invention relates to the technical field of waste heat recovery, in particular to a waste heat recovery device for edible alcohol distillation equipment, which comprises a transverse tank-shaped condensation tank, and a low-temperature medium ingress pipe is arranged on the left side of the condensation tank in a penetrating manner. According to the waste heat recovery device for the edible alcohol distillation equipment, condensate water on the inner wall of the U-shaped pipe is automatically sucked and removed through the temperature difference driving thermosyphon effect, the condensate water is prevented from forming a liquid film to hinder heat exchange, the heat exchange efficiency of high-temperature steam and a low-temperature medium is remarkably improved, and then the waste heat recovery utilization rate is increased; when the capillary tube is blocked by incrustation, the pressure sensor can automatically trigger the electromagnetic coil to drive the rotating ring to rotate, the incrustation on the inner wall of the U-shaped tube is peeled off through the capillary tube, and meanwhile in the rotating process, the elastic air bag and the protrusions are matched to achieve air injection tube cleaning and remove incrustation impurities remaining in the capillary tube; long-term stable operation of the device is guaranteed, and operation and maintenance cost and production interruption time are reduced.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, specifically a waste heat recovery device for edible alcohol distillation equipment. Background Technology

[0002] In the distillation process of edible alcohol, the distillation equipment generates a large amount of high-temperature steam. Direct discharge of this steam results in significant waste of heat energy, and the condensate formed after the high-temperature steam is condensed is not fully utilized, failing to meet the requirements of energy conservation and emission reduction. Existing technologies have developed waste heat recovery devices using horizontally placed tank-shaped condensers. These condensers have a low-temperature medium inlet pipe on the left side for introducing the low-temperature medium to be distilled, and a U-shaped pipe on the right side for introducing high-temperature steam. Waste heat is reused through heat exchange between the high-temperature steam and the low-temperature medium, while simultaneously allowing the high-temperature steam to condense into recoverable condensate.

[0003] However, existing technologies still have significant drawbacks:

[0004] 1. When high-temperature steam condenses inside the U-shaped tube, the condensate will adhere to the inner wall of the U-shaped tube to form a liquid film. This liquid film will hinder the heat exchange between the high-temperature steam and the low-temperature medium on the outer wall of the U-shaped tube, reducing the condensation efficiency and waste heat recovery effect.

[0005] 2. After long-term use, scale is prone to grow on the inner wall of the U-shaped tube. Scale not only further aggravates the problem of reduced heat exchange efficiency, but may also cause blockage of the U-shaped tube, affecting the normal operation of the device;

[0006] 3. The existing equipment lacks self-cleaning and self-detection functions. After scale buildup, the machine needs to be shut down for manual cleaning, which increases operation and maintenance costs and affects production continuity.

[0007] In view of this, we propose a waste heat recovery device for edible alcohol distillation equipment. Summary of the Invention

[0008] The purpose of this invention is to provide a waste heat recovery device for edible alcohol distillation equipment, to solve the problems mentioned in the background art, such as condensation on the inner wall of the U-shaped tube hindering heat exchange, scale accumulation affecting operating efficiency, and lack of self-cleaning function. To achieve the above objective, this invention provides the following technical solution: a waste heat recovery device for edible alcohol distillation equipment, comprising a horizontally placed tank-shaped condenser, wherein a low-temperature medium inlet pipe is provided through the left side of the condenser, and the inner ends of both low-temperature medium inlet pipes extend into the interior of the condenser and are arranged facing the right side of the condenser;

[0009] A U-shaped pipe is horizontally installed on the right side of the condenser, with both ends of the U-shaped pipe extending to the outside of the condenser. One end is the high-temperature steam inlet, and the other end is the condensate outlet.

[0010] The U-shaped tube is coaxially fitted with an inner U-tube, and a high-temperature steam flow chamber is formed between the inner U-tube and the U-shaped tube. The inner U-tube is sealed and fixed to the U-shaped tube only at the end near the high-temperature steam inlet. The end of the inner U-tube near the condensate outlet is not connected to the U-shaped tube, and the cavity of the inner U-tube is not connected to the outside of the U-shaped tube.

[0011] Meanwhile, the inner U-tube, near the condensate drain end, penetrates the condensate tank wall and extends to the outside of the condensate tank, forming a drain end. Through the asymmetrical sealing and fixing structure of the inner U-tube and the U-shaped tube, the high-temperature steam flow chamber is independently separated, and separate drain paths are provided for the condensate in the inner U-tube cavity and the residual condensate in the high-temperature steam flow chamber: the drain end discharges the condensate drawn in by the capillary tube, and the condensate drain end discharges the residual condensate in the high-temperature steam flow chamber that was not completely drawn in by the capillary tube, preventing the two types of condensate from mixing and ensuring the unobstructed flow of the high-temperature steam flow chamber.

[0012] The outer wall of the inner U-tube is uniformly distributed with multiple capillaries along its length. The outer side of the capillary tube is wrapped with a heat insulation layer. The section of the capillary tube near the liquid inlet is provided with a heat-conducting section. The heat-conducting section is made of copper alloy and is integrally formed with the capillary tube body. The outer side of the heat-conducting section is not wrapped with a heat insulation layer, but the inner side is coated with a heat insulation coating.

[0013] The inlet end of the capillary extends into the high-temperature steam flow chamber, and the outlet end of the capillary extends into the cavity of the inner U-tube through the port in the annular groove. The one-way valve only allows condensate to flow from the inlet end to the outlet end.

[0014] The outer wall of the inner U-tube is entirely covered with a heat insulation sleeve, and installation space is reserved only in the area corresponding to the rotating ring.

[0015] Multiple evenly distributed temperature-conducting rods are arranged radially along the outer side of the inner U-tube. One end of each temperature-conducting rod is fixedly connected to the wall of the inner U-tube and inserted into the cavity of the inner U-tube. The other end extends into the low-temperature medium inside the condenser. The part of the temperature-conducting rod located in the high-temperature steam flow cavity is fitted with a heat-insulating sleeve. A sealing element is provided at the connection between the temperature-conducting rod and the inner U-tube.

[0016] The inner U-tube, near the condensate discharge end, penetrates the tank wall of the condensate tank and extends to the outside of the condensate tank, forming a drain end, which is equipped with a drain valve.

[0017] The bottom of the condenser is provided with a low-temperature medium outlet pipe, which is connected to the feed end of the distillation equipment.

[0018] Preferably, the outer wall of the inner U-tube is provided with an annular groove corresponding to the arrangement position of the capillary tube, and an opening corresponding to the capillary tube is provided in the annular groove, the opening communicating with the lumen of the inner U-tube.

[0019] The rotating ring is embedded in the ring groove and rotates with the outer wall of the inner U-tube. A sealing ring is provided between the inner wall of the rotating ring and the side wall of the ring groove.

[0020] The capillary tube is fixedly connected to the rotating ring and rotates synchronously with the rotating ring.

[0021] The inlet port of the capillary extends close to the inner wall of the U-shaped tube, and the capillary body is made of wear-resistant stainless steel.

[0022] Multiple sets of electromagnetic coils are uniformly embedded in the inner wall of the inner U-tube at the position corresponding to the rotating ring along the circumference. Specifically, multiple sets of electromagnetic coils (distributed in a ring array) are uniformly arranged in the circumference along the section of the inner U-tube corresponding to the rotating ring. The spacing between adjacent coils is equal, the coils are wound in the same direction, and the embedding depth of the coils is adapted to the thickness of the inner U-tube wall (to ensure that the surface of the coil does not protrude from the outer wall of the inner U-tube to avoid interfering with the rotation of the rotating ring).

[0023] The inner wall of the rotating ring is embedded with permanent magnets that correspond one-to-one with the electromagnetic coils and are directly opposite each other (adjacent permanent magnets have opposite polarities). The radial spacing between the permanent magnets and the electromagnetic coils is reasonable to ensure magnetic field coupling efficiency.

[0024] The outer wall of the inner U-tube is uniformly provided with multiple protrusions along the circumference corresponding to the position of the rotating ring. The position of the protrusions corresponds to the position of the elastic airbag inside the rotating ring.

[0025] The electromagnetic coil is electrically connected to the pressure sensor inside the inner U-tube cavity;

[0026] When the capillary tube is aligned with the inlet in the ring groove, the liquid outlet of the capillary tube is smoothly connected to the cavity of the inner U tube through the inlet, and the condensate flows in normally. The cavity of the inner U tube maintains a stable negative pressure. At this time, the electromagnetic coil is not energized and the rotating ring is stationary.

[0027] When the capillary is blocked, specifically in two situations, such as the rotating ring being disturbed or the reset deviation after cleaning causing the capillary to misalign with the inlet (the liquid outlet of the capillary is blocked by the side wall of the ring groove) and scale on the inner wall of the inner U tube preventing the liquid inlet of the capillary from drawing water, the intake of condensate will be blocked. The thermosiphon effect driven by the temperature difference will continue to act, causing the negative pressure in the inner U tube cavity to continue to rise.

[0028] When the negative pressure value reaches the preset threshold of the pressure sensor, the pressure sensor triggers the electromagnetic coil to be energized, and the rotating ring is driven to rotate through the magnetic field coupling between the electromagnetic coil and the permanent magnet.

[0029] As the rotating ring rotates, when the capillary tube realigns with the inlet and the scale is peeled off, the blockage is cleared, the condensate water resumes flow, the negative pressure in the inner U-tube's cavity drops to the normal range, the pressure sensor controls the electromagnetic coil to de-energize, and the rotating ring stops rotating.

[0030] Among them, the capillary tube has the functions of condensate absorption and scale removal.

[0031] Preferably, multiple elastic airbags are uniformly embedded in the circumference of the rotating ring. The elastic airbags are made of heat-resistant rubber. Each elastic airbag is connected to the corresponding capillary tube cavity through an internal air channel. The connection between the air channel and the capillary is located on the side of the one-way valve near the liquid outlet end (because the one-way valve is located at the end of the capillary near the inner U-tube), ensuring that compressed air can smoothly enter the liquid inlet end of the capillary during air jet cleaning.

[0032] When the rotating ring rotates, the elastic airbag will periodically contact and be squeezed with the protrusions on the outer wall of the inner U-tube during the rotation process. After being squeezed, the air in the airbag is forced into the capillary tube cavity through the air passage and one-way air outlet valve to achieve air jet cleaning.

[0033] After the compression ends, the elastic airbag returns to its original position under its own elasticity, automatically drawing in air to replenish it, preparing for the next air jet.

[0034] Preferably, the liquid inlet port of the capillary is configured with a beveled cut structure, and the beveled cut faces the inner wall of the U-shaped tube.

[0035] Preferably, the capillary tube forms a composite structure with the heat-conducting section, and the heat insulation layer extends to the edge of the heat-conducting section.

[0036] Preferably, the one-way valve is made of temperature-resistant and corrosion-resistant stainless steel;

[0037] The surface of the temperature guide rod is coated with a heat-insulating coating, and the seal is made of heat-resistant rubber.

[0038] Preferably, the elastic airbag is made of heat-resistant rubber.

[0039] The heat insulation sleeve and heat insulation layer are made of ceramic fiber.

[0040] Preferably, the electromagnetic coils are arranged in a ring array, with adjacent permanent magnets having alternating opposite polarities.

[0041] A waste heat recovery device for edible alcohol distillation equipment includes the following steps:

[0042] S1, Waste heat recovery operation: The low-temperature medium to be distilled enters the condenser through the low-temperature medium inlet pipe on the left side of the condenser, and the high-temperature steam enters the high-temperature steam flow chamber (the gap between the inner U-tube and the U-shaped tube) through the high-temperature steam inlet end of the U-shaped tube.

[0043] High-temperature steam exchanges heat with the low-temperature medium in the condenser. After releasing heat, the high-temperature steam condenses to form condensate. Most of the condensate adheres to the inner wall of the U-shaped tube (and is subsequently drawn into the inner U-tube by the capillary tube). A small amount of residual condensate that is not drawn in flows along the high-temperature steam flow chamber to the condensate discharge end under the action of gravity.

[0044] After absorbing heat, the temperature of the cryogenic medium rises, and it enters the distillation equipment through the cryogenic medium outlet pipe at the bottom of the condenser, thus realizing the reuse of waste heat.

[0045] S2, Fixed temperature difference condensate intake condition: When high-temperature steam flows in the high-temperature steam flow chamber, the U-shaped tube and the high-temperature steam flow chamber are kept at a high temperature.

[0046] The inner U-tube, under the insulation of the heat-insulating sleeve, works with the temperature-conducting rod to conduct the cold energy of the low-temperature medium in the condenser, maintaining a low temperature.

[0047] The capillary heat-conducting section directly absorbs the heat of the steam, keeping the liquid inlet end (steam end) of the capillary at a stable high temperature, while the inside of the tube is kept at a low temperature due to the protection of the inner and outer heat insulation coatings. This creates an enhanced temperature difference between the two ends of the capillary, while the inner U-tube cavity forms a stable negative pressure due to the low temperature of the condensate.

[0048] The combined effect of enhanced temperature difference and negative pressure causes the condensate adhering to the inner wall of the U-shaped tube in the high-temperature steam flow chamber to be drawn into the capillary tube, flow into the inner U-tube cavity through the one-way valve, and finally be discharged through the drain end.

[0049] S3. Self-detection and self-cleaning mode: The pressure sensor inside the inner U-tube monitors the pressure change in the tube cavity in real time to realize the self-detection function;

[0050] When capillary obstruction is detected (including capillary inlet blocked by scale, capillary misalignment with the port leading to outlet blockage), the obstruction of condensate intake causes the negative pressure in the inner U-tube cavity to rise. The pressure sensor triggers the electromagnetic coil to be energized, driving the rotating ring to rotate and enter the self-cleaning state.

[0051] During the rotation, the capillary rotates synchronously with the rotating ring, peeling off the scale adhering to the inner wall of the U-shaped tube, and gradually adjusting its position until it is re-aligned with the opening.

[0052] During this process, the elastic airbag inside the rotating ring periodically contacts and is squeezed against the protrusion on the outer wall of the inner U-tube. The air inside the airbag is forced into the capillary tube cavity through the air passage and one-way air outlet valve to achieve air jet cleaning and remove residual scale and impurities in the capillary tube.

[0053] When the blockage is cleared and the condensate flow resumes, the negative pressure in the inner U-tube drops to the normal range. The pressure sensor controls the electromagnetic coil to de-energize, the rotating ring stops rotating, and the self-detection and self-cleaning process ends.

[0054] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0055] 1. Improved condensation efficiency and waste heat recovery: This invention achieves automatic suction and removal of condensate from the inner wall of the U-shaped tube by using the thermosiphon effect driven by temperature difference, avoiding the formation of a liquid film by condensate that hinders heat exchange, significantly improving the heat exchange efficiency between high-temperature steam and low-temperature medium, thereby improving the waste heat recovery and utilization rate, which meets the production requirements of energy saving and consumption reduction.

[0056] 2. Achieve automatic scale removal and reduce operation and maintenance costs: The device integrates a dual self-cleaning structure of negative pressure driven rotary descaling and airbag squeezing pipe cleaning, eliminating the need for manual cleaning during shutdown;

[0057] When the capillary tube becomes clogged with scale, the pressure sensor can automatically trigger the electromagnetic coil to drive the rotating ring to rotate. The scale on the inner wall of the U-shaped tube is peeled off by the capillary tube itself. At the same time, during the rotation, the elastic air bladder and the protrusion work together to realize air jet cleaning, remove the scale and impurities remaining in the capillary tube, ensure the long-term stable operation of the device, and reduce operation and maintenance costs and production interruption time.

[0058] 3. Reasonable structural design and stable and reliable operation: The asymmetrical sealing and fixing structure of the inner U-tube and the U-shaped tube provides an independent discharge path for condensate, avoiding the mixing of different condensates and affecting subsequent use;

[0059] The coordinated design of structures such as the heat insulation sleeve and the temperature guide rod enhances the temperature difference driving effect and ensures the stability of condensate intake;

[0060] The materials selected for each component are suitable for high-temperature operating conditions, and the sealing performance is excellent, further improving the reliability of the device operation.

[0061] 4. Strong functional synergy and wide adaptability: Waste heat recovery, condensate intake, self-detection and self-cleaning modes work together and can be automatically adjusted according to the actual operating status without manual intervention;

[0062] The device has a compact structure and can be directly adapted to the feeding and steam emission systems of existing edible alcohol distillation equipment. It is easy to modify and has wide adaptability. Attached Figure Description

[0063] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0064] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;

[0065] Figure 3 This is an exploded view of the U-shaped tube and the inner U-tube of the present invention;

[0066] Figure 4 This is an exploded view of the U-tube and rotating ring inside the present invention;

[0067] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0068] Figure 6 This is a partial cross-sectional view of the inner U-tube and rotating ring of the present invention. Figure 1 ;

[0069] Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle;

[0070] Figure 8 This is a partial cross-sectional view of the inner U-tube and rotating ring of the present invention. Figure 2 ;

[0071] Figure 9 For the present invention Figure 8 A magnified view of point C in the middle.

[0072] In the diagram: 1. Condenser; 2. Cryogenic medium inlet pipe; 3. U-shaped pipe; 4. Inner U-tube; 5. High-temperature steam inlet; 6. Condensate outlet; 7. High-temperature steam flow chamber; 8. Drainage outlet; 9. Capillary tube; 10. Protrusion; 11. One-way valve; 12. Thermal insulation sleeve; 13. Temperature guide rod; 14. Thermal insulation sleeve; 15. Cryogenic medium outlet pipe; 16. Rotating ring; 17. Ring groove; 18. Port; 19. Electromagnetic coil; 20. Permanent magnet; 21. Pressure sensor; 22. Elastic airbag; 23. Air passage. Detailed Implementation

[0073] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0074] Please see Figures 1 to 9 This invention provides a technical solution: a waste heat recovery device for edible alcohol distillation equipment, comprising a horizontally placed tank-shaped condenser 1, with a low-temperature medium inlet pipe 2 extending through the left side of the condenser 1. The inner ends of the low-temperature medium inlet pipe 2 extend into the condenser 1 and are arranged facing the right side of the condenser 1. By symmetrically arranging the low-temperature medium inlet pipes 2, the low-temperature medium to be distilled (such as alcohol raw material) can be uniformly introduced into the condenser 1, avoiding the problem of uneven medium distribution caused by a single inlet pipe, ensuring sufficient contact between the low-temperature medium and the high-temperature area inside the condenser 1, and improving heat exchange efficiency. At the same time, the inner ends of the inlet pipes are arranged facing the right side of the condenser 1, which can guide the low-temperature medium to the area where the U-shaped pipe 3 is located, shortening the heat exchange path and further enhancing the heat exchange effect.

[0075] A U-shaped pipe 3 is horizontally installed through the right side of the condenser 1. Both ends of the U-shaped pipe 3 extend to the outside of the condenser 1, with one end serving as the high-temperature steam inlet 5 and the other as the condensate outlet 6. The U-shaped pipe 3 is installed horizontally, and its curved structure can extend the residence time of high-temperature steam in the condenser 1, allowing for more thorough heat exchange between the high-temperature steam and the low-temperature medium. At the same time, the fact that both ends of the U-shaped pipe 3 extend to the outside of the condenser 1 facilitates connection with the steam outlet pipeline and condensate recovery pipeline of the distillation equipment, enabling a smooth connection between the waste heat recovery system and the main distillation system. This external port design also facilitates subsequent inspection and maintenance.

[0076] An inner U-tube 4 is coaxially sleeved inside the U-shaped tube 3, forming a high-temperature steam flow chamber 7 between the inner U-tube 4 and the U-shaped tube 3. The inner U-tube 4 is sealed and fixed to the U-shaped tube 3 only at the end near the high-temperature steam inlet 5, and the end near the condensate outlet 6 is not connected to the U-shaped tube 3. Furthermore, the cavity of the inner U-tube 4 is not connected to the outside of the U-shaped tube 3. The coaxial sleeve structure of the inner U-tube 4 and the U-shaped tube 3 ensures that the gap in the high-temperature steam flow chamber 7 formed between them is uniform, avoiding differences in steam flow rate caused by uneven gaps, thereby ensuring the stability of heat exchange. The asymmetrical connection method of sealing and fixing only at one end can ensure the sealing of the high-temperature steam flow chamber 7, preventing steam leakage, and also avoid the limitation of thermal expansion and contraction of the tube body caused by fixing at both ends, reducing stress damage caused by temperature changes and extending the service life of the equipment.

[0077] Meanwhile, the inner U-tube 4, near the condensate discharge end 6, penetrates the wall of the condenser tank 1 and extends to the outside of the condenser tank 1, forming the drain end 8. Through the asymmetrical sealing and fixing structure of the inner U-tube 4 and the U-shaped tube 3, the high-temperature steam flow chamber 7 is independently separated, and independent discharge paths are provided for the condensate in the inner U-tube 4 and the residual condensate in the high-temperature steam flow chamber 7: the drain end 8 discharges the condensate drawn in by the capillary tube 9, and the condensate discharge end 6 discharges the residual condensate in the high-temperature steam flow chamber 7 that was not completely drawn in by the capillary tube 9, preventing the mixing of the two types of condensate while ensuring the unobstructed flow of the high-temperature steam flow chamber 7. This dual-path condensate discharge design effectively distinguishes condensate from different sources, facilitating subsequent classification, recycling, and reuse of the condensate; at the same time, it avoids the problem of steam flow obstruction caused by condensate accumulation in the flow chamber, ensuring the continuous and stable operation of the waste heat recovery process.

[0078] Multiple capillary tubes 9 are evenly distributed along the length of the outer wall of the inner U-tube 4. The outer side of the capillary tube 9 is wrapped with a heat insulation layer. A heat-conducting section is set in the section of the capillary tube 9 near the liquid inlet. The heat-conducting section is made of copper alloy and is integrally formed with the capillary tube 9. The outer side of the heat-conducting section is not wrapped with a heat insulation layer, but the inner side is coated with a heat insulation coating. The multiple capillary tubes 9 are evenly distributed along the length of the inner U-tube 4, which can achieve comprehensive absorption of condensate in different areas of the inner wall of the U-tube 3 and avoid the formation of absorption blind spots. The heat insulation layer can reduce heat loss from the capillary tube 9 and ensure a stable temperature difference between the inside and outside of the capillary tube 9. The copper alloy heat-conducting section has excellent thermal conductivity and can quickly absorb the heat of high-temperature steam. Combined with the heat insulation coating on the inner side, it can form a significant temperature gradient at both ends of the capillary tube 9, providing impetus for the intake of condensate. The integral structural design of the heat-conducting section and the capillary tube 9 can improve the connection strength, avoid the problem of falling off due to long-term use, and reduce heat loss during the heat transfer process.

[0079] The inlet end of the capillary tube 9 extends into the high-temperature steam flow chamber 7, and the outlet end of the capillary tube 9 extends into the cavity of the inner U-tube 4 through the port 18 in the annular groove 17. The one-way valve 11 only allows condensate to flow from the inlet end to the outlet end. The inlet end of the capillary tube 9 extends into the high-temperature steam flow chamber 7, which can come into close contact with the condensate adhering to the inner wall of the U-tube 3, thereby improving the condensate suction efficiency. The one-way valve 11 can effectively prevent the condensate entering the cavity of the inner U-tube 4 from flowing back into the capillary tube 9, ensuring the smooth one-way flow of condensate. At the same time, it can also prevent the negative pressure environment in the cavity of the inner U-tube 4 from being destroyed, thus ensuring the stability of the condensate suction power.

[0080] The outer wall of the inner U-tube 4 is entirely covered with a heat-insulating sleeve 12, with installation space reserved only in the area corresponding to the rotating ring 16. The heat-insulating sleeve 12 can reduce the heat exchange between the inner U-tube 4 and the high-temperature steam flow chamber 7, ensuring that the inner U-tube 4 cavity maintains a low temperature and providing a guarantee for the formation of a negative pressure environment. The design of reserving installation space for the rotating ring 16 not only meets the installation requirements of the rotating ring 16, but also does not damage the overall heat insulation effect of the heat-insulating sleeve 12, achieving synergistic compatibility between the heat insulation function and the rotation function.

[0081] Multiple evenly distributed temperature-conducting rods 13 are arranged radially along the outer side of the inner U-tube 4 and the condenser 1. One end of the temperature-conducting rod 13 is fixedly connected to the wall of the inner U-tube 4 and inserted into the cavity of the inner U-tube 4, while the other end extends into the low-temperature medium inside the condenser 1. The portion of the temperature-conducting rod 13 located in the high-temperature steam flow chamber 7 is fitted with a heat-insulating sleeve 14, and a sealing element is provided at the connection between the temperature-conducting rod 13 and the inner U-tube 4. The multiple evenly distributed temperature-conducting rods 13 can evenly conduct the cold energy of the low-temperature medium in the condenser 1 to the cavity of the inner U-tube 4, ensuring a uniform temperature distribution in the cavity of the inner U-tube 4 and avoiding excessively high local temperatures that could affect the stability of the negative pressure environment. The heat-insulating sleeve 14 in the high-temperature steam flow chamber 7 can prevent the temperature-conducting rods 13 from absorbing heat in this area, ensuring heat conduction efficiency. The sealing element can prevent leakage between the cavity of the inner U-tube 4 and the high-temperature steam flow chamber 7, ensuring the sealing performance of the equipment.

[0082] The inner U-tube 4, near the condensate discharge end 6, penetrates the wall of the condenser tank 1 and extends to the outside of the condenser tank 1, forming a drain end 8. The drain end 8 is equipped with a drain valve. The drain valve enables precise control of the condensate discharge volume. The discharge speed can be flexibly adjusted according to the condensate storage in the inner U-tube 4 cavity and the operating conditions of the distillation equipment, avoiding negative pressure fluctuations caused by excessively fast condensate discharge or condensate accumulation caused by excessively slow discharge. At the same time, the drain valve can be closed during equipment maintenance or shutdown to prevent external air from entering the inner U-tube 4 cavity and ensure the cleanliness of the internal environment of the equipment.

[0083] The bottom of the condenser 1 is equipped with a low-temperature medium outlet pipe 15, which is connected to the feed end of the distillation equipment. The installation position at the bottom of the condenser 1 allows the low-temperature medium, which has increased in temperature after absorbing heat, to be smoothly discharged under the action of gravity, improving the smoothness of medium flow; the direct connection with the feed end of the distillation equipment enables the medium after waste heat recovery to directly enter the distillation process, reducing heat loss in intermediate transportation links, maximizing the efficiency of waste heat utilization, and realizing the recycling of energy.

[0084] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9As shown, an annular groove 17 is provided on the outer wall of the inner U-tube 4 corresponding to the arrangement position of the capillary tube 9. The annular groove 17 has a through-hole 18 corresponding to the capillary tube 9, and the through-hole 18 is connected to the cavity of the inner U-tube 4. The opening of the annular groove 17 provides a stable support structure for the installation of the rotating ring 16, ensuring that the rotating ring 16 can be accurately positioned and rotate stably. The one-to-one corresponding through-hole 18 design can ensure that the liquid outlet end of each capillary tube 9 can be accurately connected to the cavity of the inner U-tube 4, ensuring the smooth flow of condensate. At the same time, the size of the through-hole 18 is adapted to the liquid outlet end of the capillary tube 9, which can reduce the resistance in the flow process of condensate and improve the flow efficiency.

[0085] The rotating ring 16 is embedded in the annular groove 17 and rotates with the outer wall of the inner U-tube 4. A sealing ring is provided between the inner wall of the rotating ring 16 and the side wall of the annular groove 17. The rotating engagement structure between the rotating ring 16 and the annular groove 17 can ensure the smoothness of the rotation process of the rotating ring 16 and reduce frictional resistance. The sealing ring can prevent steam or condensate in the high-temperature steam flow chamber 7 from entering the inner U-tube 4 cavity through the gap between the annular groove 17 and the rotating ring 16, ensuring the negative pressure environment of the inner U-tube 4 cavity and the sealing performance of the steam flow chamber 7, and avoiding cross-contamination between different media.

[0086] The capillary tube 9 is fixedly connected to the rotating ring 16 and rotates synchronously with the rotating ring 16. This fixed connection method enables the capillary tube 9 to rotate synchronously under the drive of the rotating ring 16, thereby cleaning different positions on the inner wall of the U-shaped tube 3 and effectively removing scale and other impurities attached to the tube wall. At the same time, the synchronous rotation of the capillary tube 9 can also adjust its alignment with the port 18, solving the problem of condensate suction obstruction caused by misalignment and ensuring the stable operation of the equipment.

[0087] The inlet end of the capillary tube 9 extends close to the inner wall of the U-shaped tube 3, and the body of the capillary tube 9 is made of wear-resistant stainless steel. The design of the inlet end being close to the inner wall of the U-shaped tube 3 can maximize the suction effect of condensate and facilitate the removal of scale on the tube wall during rotation. The wear-resistant stainless steel material has excellent wear resistance and corrosion resistance, and can withstand long-term erosion by high-temperature steam and condensate, reducing the wear of the capillary tube 9, extending its service life, and reducing the maintenance cost of the equipment.

[0088] Multiple sets of electromagnetic coils 19 are uniformly embedded circumferentially inside the inner wall of the inner U-tube 4, corresponding to the position of the rotating ring 16. Specifically, multiple sets of electromagnetic coils 19 are uniformly arranged circumferentially (in a ring array) along the section of the inner U-tube 4 corresponding to the rotating ring 16. The spacing between adjacent coils is equal, the coils are wound in the same direction, and the embedding depth of the coils is adapted to the thickness of the inner U-tube 4 wall (ensuring that the coil surface does not protrude from the outer wall of the inner U-tube 4 to avoid interfering with the rotation of the rotating ring 16). The ring array of electromagnetic coils 19 can generate a uniform magnetic field, ensuring a stable magnetic field coupling with the permanent magnet 20 inside the rotating ring 16, providing a smooth driving force for the rotation of the rotating ring 16. The design of equal spacing and consistent winding direction between adjacent coils can avoid magnetic field interference and ensure the uniformity of magnetic field strength. The precise adaptation of the coil embedding depth can ensure the fixed stability of the coils and avoid mechanical interference with the rotating ring 16, ensuring the smooth rotation of the rotating ring 16.

[0089] The inner wall of the rotating ring 16 is embedded with permanent magnets 20 that correspond one-to-one with the electromagnetic coils 19 and are directly opposite each other (adjacent permanent magnets 20 have alternating opposite polarities). The radial spacing between the permanent magnets 20 and the electromagnetic coils 19 is reasonable to ensure magnetic field coupling efficiency. The one-to-one correspondence and direct alignment of the permanent magnets 20 and the electromagnetic coils 19 can maximize the magnetic field coupling efficiency, reduce energy loss, and ensure that the rotating ring 16 can obtain sufficient rotational power. The design of the alternating opposite polarities of adjacent permanent magnets 20 can enable the rotating ring 16 to generate a continuous rotational torque under the action of the magnetic field, achieving smooth rotation. The reasonable radial spacing can ensure the magnetic field coupling effect while avoiding mechanical friction between the two, thus extending the service life of the equipment.

[0090] Multiple protrusions 25 are evenly arranged circumferentially on the outer wall of the inner U-tube 4, corresponding to the position of the rotating ring 16. The positions of the protrusions 25 correspond to the positions of the elastic airbags 22 inside the rotating ring 16. The protrusions 25 provide the application points for the compression of the elastic airbags 22. Through the rotation of the rotating ring 16, the elastic airbags 22 and the protrusions 25 periodically come into contact and generate compression, thereby realizing the jet cleaning function. The evenly distributed protrusions 25 can ensure that the compression force on the elastic airbags 22 is uniform during rotation, ensuring that each capillary 9 can obtain a stable jet cleaning effect and avoiding incomplete cleaning.

[0091] The electromagnetic coil 19 is electrically connected to the pressure sensor 21 inside the inner U-tube 4. This electrical connection enables precise linkage between the pressure signal and the electromagnetic drive, making the rotation control of the rotating ring 16 more intelligent and automated. It can complete the self-detection and self-cleaning process without manual intervention, thereby improving the operating efficiency and reliability of the equipment.

[0092] When the capillary tube 9 is aligned with the port 18 in the annular groove 17, the liquid outlet end of the capillary tube 9 is smoothly connected to the cavity of the inner U-tube 4 through the port 18, and the condensate flows in normally. The cavity of the inner U-tube 4 maintains a stable negative pressure. At this time, the electromagnetic coil 19 is not energized, and the rotating ring 16 is stationary. This design can reduce energy consumption and lower operating costs during normal operation of the equipment, while avoiding wear caused by unnecessary rotation of the rotating ring 16 and extending the service life of the equipment.

[0093] When the capillary tube 9 is obstructed, specifically in two situations—disturbed rotation of the rotating ring 16 or misalignment after cleaning and resetting leading to misalignment between the capillary tube 9 and the inlet 18 (the liquid outlet of the capillary tube 9 is blocked by the side wall of the ring groove 17) and scale buildup on the inner wall of the inner U-tube 4 preventing the liquid inlet of the capillary tube 9 from drawing water—the intake of condensate will be obstructed. The thermosiphon effect driven by the temperature difference will continue to act, causing the negative pressure in the inner U-tube 4 cavity to rise continuously. Identifying these two obstruction scenarios comprehensively covers potential fault scenarios that may occur during equipment operation, ensuring the comprehensiveness of the self-detection function and preventing equipment downtime or efficiency reduction due to missed fault types.

[0094] When the negative pressure value reaches the preset threshold of the pressure sensor 21, the pressure sensor 21 triggers the electromagnetic coil 19 to be energized, and the rotating ring 16 is driven to rotate through the magnetic field coupling between the electromagnetic coil 19 and the permanent magnet 20. The setting of the preset threshold can realize the accurate judgment of the obstruction situation, avoid false triggering caused by slight fluctuations in negative pressure, ensure that the self-cleaning function starts at a reasonable time, and improve the accuracy of equipment control.

[0095] As the rotating ring 16 rotates, when the capillary tube 9 realigns with the inlet 18 and the scale is peeled off, the blockage is cleared, the condensate flow resumes, the negative pressure in the inner U-tube 4 drops to the normal range, the pressure sensor 21 controls the electromagnetic coil 19 to de-energize, and the rotating ring 16 stops rotating. This automatic start-stop control logic can stop the rotation of the rotating ring 16 in time after the fault is cleared, reducing energy consumption and equipment wear, and achieving efficient and energy-saving operation of the equipment.

[0096] Among them, the capillary tube 9 has both condensate absorption and scale removal functions; this integrated design simplifies the equipment structure, reduces the setting of independent cleaning components, lowers the manufacturing cost and maintenance difficulty of the equipment, and at the same time improves the integration level of the equipment, making the equipment operation more stable and reliable.

[0097] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9As shown, multiple elastic airbags 22 are evenly embedded circumferentially inside the rotating ring 16. The elastic airbags 22 are made of heat-resistant rubber. Each elastic airbag 22 is connected to the corresponding capillary tube 9 through an internal air passage 23. The connection between the air passage 23 and the capillary tube 9 is located on the side of the one-way valve 11 near the liquid outlet (because the one-way valve 11 is located at the end of the capillary tube 9 near the inner U-tube 4), ensuring that compressed air can smoothly enter the liquid inlet of the capillary tube 9 during jet cleaning. The heat-resistant rubber elastic airbags 22 can adapt to the working environment of the high-temperature steam flow chamber 7, avoiding aging or damage caused by high temperature and extending service life. The precise connection between the internal air passage 23 and the capillary tube 9 ensures that the compressed air generated by the elastic airbag 22 directly enters the capillary tube 9, achieving precise cleaning of the inside of the capillary tube 9. The position design of the connection between the air passage 23 and the capillary tube 9 avoids the obstruction of the one-way valve 11, ensuring that the compressed air flows smoothly to the liquid inlet of the capillary tube 9, improving the cleaning effect.

[0098] As the rotating ring 16 rotates, the elastic airbag 22 periodically contacts and is compressed against the protrusion 25 on the outer wall of the inner U-tube 4. The compressed air is then forced into the capillary tube 9 cavity through the air passage 23 and the one-way exhaust valve, achieving air jet cleaning. After compression, the elastic airbag 22 resets under its own elasticity and automatically draws in air to replenish itself, preparing for the next air jet. This periodic compression and reset design enables continuous cleaning of the capillary tube 9, ensuring that the inside of the capillary tube 9 remains unobstructed. The automatic air replenishment function eliminates the need for additional inflation equipment, simplifying the equipment structure and reducing operating costs.

[0099] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, the inlet port of capillary tube 9 is designed with a beveled cut, with the bevel facing the inner wall of U-shaped tube 3. The beveled cut increases the contact area between the inlet port of capillary tube 9 and the condensate, improving the condensate intake efficiency. At the same time, the design of the bevel facing the inner wall of U-shaped tube 3 facilitates the scraping and removal of scale on the tube wall by the cut edge during the rotation of capillary tube 9, further improving the cleaning effect.

[0100] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9As shown, the capillary tube 9 forms a composite structure with the heat-conducting section, and the insulation layer extends to the edge of the heat-conducting section. The composite structure design can fully utilize the wear resistance and corrosion resistance of the main tube section and the high-efficiency heat conduction of the heat-conducting section to achieve functional complementarity. The design of the insulation layer extending to the edge of the heat-conducting section can accurately divide the insulation area and the heat-conducting area, avoid heat loss in the transition area, ensure the stability of the temperature difference between the two ends of the capillary tube 9, and provide a continuous and stable driving force for the intake of condensate.

[0101] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, the one-way valve 11 is made of temperature-resistant and corrosion-resistant stainless steel; the surface of the temperature-conducting rod 13 is coated with a heat-insulating coating, and the sealing element is made of temperature-resistant rubber. The temperature-resistant and corrosion-resistant stainless steel one-way valve 11 can adapt to high-temperature and humid working environments, avoiding sealing failure caused by corrosion or high-temperature aging, and ensuring the stable realization of the one-way flow function; the heat-insulating coating on the surface of the temperature-conducting rod 13 can reduce its heat absorption in the high-temperature steam flow chamber 7 area, ensuring heat conduction efficiency; the temperature-resistant rubber sealing element can maintain good sealing performance in high-temperature environments, avoiding leakage problems.

[0102] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, the elastic airbag 22 is made of heat-resistant rubber; the heat insulation sleeve 12 and the heat insulation layer are made of ceramic fiber. Ceramic fiber has excellent heat insulation and high-temperature resistance, which can effectively reduce heat transfer, ensure the heat insulation effect of the heat insulation sleeve 12 and the heat insulation layer, and adapt to high-temperature working environments, thus extending its service life.

[0103] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 9 As shown, the electromagnetic coils 19 are arranged in a ring array, and the polarities of adjacent permanent magnets 20 alternate with opposite polarities. This distribution can generate a uniform and continuous rotating magnetic field, providing a smooth and continuous driving force for the rotating ring 16, ensuring the smoothness and stability of the rotation process of the rotating ring 16, and avoiding jamming or speed fluctuations.

[0104] A method for using a waste heat recovery device in an edible alcohol distillation equipment includes the following steps:

[0105] S1. Waste heat recovery operation: The low-temperature medium to be distilled enters the condenser 1 through the low-temperature medium inlet pipe 2 on the left side of the condenser 1. During the introduction process, the inflow rate of the low-temperature medium can be controlled by adjusting the valve opening of the inlet pipe to ensure that the liquid level of the medium in the condenser 1 is maintained within a reasonable range, so as to avoid the liquid level being too high or too low and affecting the heat exchange effect. High-temperature steam enters the high-temperature steam flow chamber 7 (the gap between the inner U-tube 4 and the U-tube 3) through the high-temperature steam inlet end 5 of the U-tube 3. At the same time, it is necessary to ensure that the introduction pressure of the high-temperature steam is stable to avoid abnormal steam flow rate caused by pressure fluctuations.

[0106] High-temperature steam exchanges heat with the low-temperature medium in condenser 1. After releasing heat, the high-temperature steam condenses to form condensate. During this process, the high-temperature steam flows slowly along the flow cavity under the guidance of U-shaped tube 3 to ensure sufficient heat exchange. Most of the condensate adheres to the inner wall of U-shaped tube 3 (and is subsequently sucked into inner U-tube 4 by capillary tube 9). A small amount of residual condensate that is not sucked in flows along the high-temperature steam flow cavity 7 to the condensate discharge end 6 under the action of gravity. During the discharge process, the discharge speed can be adjusted by the valve at the condensate discharge end 6 to avoid water accumulation in the flow cavity.

[0107] After absorbing heat, the cryogenic medium's temperature rises, and it enters the distillation equipment through the cryogenic medium outlet pipe 15 at the bottom of the condenser 1, thus realizing the reuse of waste heat. During the outlet process, the temperature of the cryogenic medium can be monitored in real time, and the introduction rate of the cryogenic medium and high-temperature steam can be adjusted according to the temperature monitoring results to ensure that the temperature of the medium entering the distillation equipment meets the process requirements.

[0108] S2, Fixed temperature difference intake condition of condensate: When high-temperature steam flows in the high-temperature steam flow chamber 7, it keeps the U-shaped tube 3 and the high-temperature steam flow chamber 7 at a high temperature. During this process, the sealing structure of the high-temperature steam flow chamber 7 ensures that the steam will not leak and that the heat is concentrated for heat exchange.

[0109] Under the heat insulation effect of the heat insulation sleeve 12, the inner U-tube 4 cavity, together with the temperature conducting rod 13, conducts the cold energy of the low-temperature medium in the condenser 1, maintaining a low temperature. The synergistic effect of the heat insulation sleeve 12 and the temperature conducting rod 13 ensures that the temperature of the inner U-tube 4 cavity is stable and avoids local temperature fluctuations.

[0110] The heat-conducting section of capillary tube 9 directly absorbs the heat of the steam, keeping the liquid inlet end (steam end) of capillary tube 9 at a stable high temperature, while the inside of the tube remains at a low temperature due to the protection of the inner and outer heat insulation coatings. This creates a strong temperature difference between the two ends of capillary tube 9. At the same time, the cavity of the inner U-tube 4 forms a stable negative pressure due to the low temperature of the condensate. During this process, the complete coverage of the heat insulation layer and the heat insulation coating ensures that the temperature difference can be maintained stably, providing a continuous driving force for the intake of condensate.

[0111] The combined effect of enhanced temperature difference and negative pressure causes the condensate adhering to the inner wall of the U-shaped tube 3 in the high-temperature steam flow chamber 7 to be drawn into the capillary tube 9 and flow into the cavity of the inner U-tube 4 through the one-way valve 11. During this process, the one-way valve 11 effectively prevents the condensate from flowing back and ensures a stable flow direction. Finally, it is discharged through the drain end 8. During the drainage process, the opening of the drain valve can be flexibly adjusted according to the amount of condensate in the cavity of the inner U-tube 4 to control the drainage speed.

[0112] S3. Self-detection and self-cleaning mode: The pressure sensor 21 in the inner U-tube 4 monitors the pressure change in the tube cavity in real time to realize the self-detection function. The pressure sensor 21 needs to be calibrated regularly to ensure the accuracy of pressure monitoring and avoid misjudgment.

[0113] When capillary tube 9 is detected to be blocked (including the inlet end of capillary tube 9 being blocked by scale, or the outlet end being blocked due to misalignment between capillary tube 9 and port 18), the obstruction of condensate intake causes the negative pressure in the inner U-tube 4 to increase. At this time, pressure sensor 21 promptly captures the pressure change signal, triggers the electromagnetic coil 19 to be energized, and drives the rotating ring 16 to rotate, entering the self-cleaning state. During the energization of electromagnetic coil 19, it is necessary to ensure stable power supply to avoid insufficient driving force due to voltage fluctuations.

[0114] During the rotation, the capillary tube 9 rotates synchronously with the rotating ring 16, peeling off the scale adhering to the inner wall of the U-shaped tube 3. During this process, the rotation speed of the capillary tube 9 remains stable to ensure that the scale can be effectively peeled off. At the same time, the position is gradually adjusted until it is re-aligned with the ring groove 17 and the through port 18. During the alignment process, the alignment status can be fed back through pressure changes.

[0115] During this process, the elastic airbag 22 inside the rotating ring 16 periodically contacts and is squeezed against the protrusion 25 on the outer wall of the inner U tube 4. The air inside the airbag is forced into the capillary tube 9 cavity through the air passage 23 and the one-way air outlet valve to achieve air jet cleaning and remove residual scale and impurities inside the capillary tube 9. The air jet pressure is precisely controlled by the elastic coefficient of the elastic airbag 22 to ensure that impurities can be effectively cleaned without damaging the capillary tube 9.

[0116] When the blockage is cleared and the condensate flow resumes, the negative pressure in the inner U-tube 4 drops to the normal range. Pressure sensor 21 then de-energizes the electromagnetic coil 19, causing the rotating ring 16 to stop rotating, thus ending the self-detection and self-cleaning process. After this process, the equipment automatically returns to normal operation without manual intervention, ensuring continuous operation.

[0117] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for an edible alcohol distillation equipment, comprising a condenser (1), a low-temperature medium inlet pipe (2), a U-shaped pipe (3), and an inner U-shaped pipe (4), wherein the low-temperature medium inlet pipe (2) is provided on the left side of the condenser (1) and the U-shaped pipe (3) is provided on the right side, one end of the U-shaped pipe (3) is a high-temperature steam inlet end (5), and the other end is a condensate outlet end (6), characterized in that: The inner U-tube (4) is coaxially sleeved inside the U-tube (3), forming a high-temperature steam flow chamber (7) between the two. Only one end of the inner U-tube (4) is sealed and fixed to the U-tube (3), and the other end is not connected and extends out of the condenser (1) to form a drain end (8). Capillaries (9) are evenly distributed on the outer wall of the inner U-tube (4). The capillary tube (9) is provided with a heat insulation layer, and a heat-conducting section is provided near the liquid inlet end. The inner side of the heat-conducting section is coated with a heat insulation coating, and the outer side is not coated with a heat insulation layer. The liquid inlet end of the capillary tube (9) extends to the high-temperature steam flow chamber (7), and a one-way valve (11) is provided near the end of the inner U-tube (4). The outer wall of the inner U-tube (4) is fitted with a heat insulation sleeve (12), and multiple temperature guide rods (13) are arranged radially on the outer side. One end of the temperature guide rod (13) is inserted into the cavity of the inner U-tube (4), and the other end extends to the low temperature medium in the condenser (1). The section of the temperature guide rod (13) located in the high temperature steam flow cavity (7) is fitted with a heat insulation sleeve (14). The condenser (1) is equipped with a low-temperature medium outlet pipe (15) at the bottom.

2. The waste heat recovery device for edible alcohol distillation equipment according to claim 1, characterized in that: The outer wall of the inner U-tube (4) is provided with an annular groove (17) corresponding to the position of the rotating ring (16), and the rotating ring (16) is embedded in the annular groove (17) to achieve rotational connection; The annular groove (17) is provided with a through-hole (18) corresponding to the capillary tube (9). The through-hole (18) is connected to the cavity of the inner U-tube (4). The capillary tube (9) is fixedly connected to the rotating ring (16) and rotates synchronously with the rotating ring (16). An electromagnetic coil (19) is embedded in the wall of the inner U-tube (4), and a permanent magnet (20) corresponding to the electromagnetic coil (19) is embedded in the inner wall of the rotating ring (16). A pressure sensor (21) is installed inside the cavity of the inner U-tube (4), and an electromagnetic coil (19) is electrically connected to the pressure sensor (21). When the capillary tube (9) is aligned with the port (18), the liquid outlet end of the capillary tube (9) is connected to the cavity of the inner U-tube (4) through the port (18) to ensure the flow of condensate. When the capillary tube (9) is blocked, causing the condensate to be blocked, the negative pressure in the inner U tube (4) increases, triggering the pressure sensor (21) to start the electromagnetic coil (19), driving the rotating ring (16) to rotate. Until the blockage is cleared and the negative pressure returns to normal, the electromagnetic coil (19) is de-energized and the rotating ring (16) stops rotating.

3. The waste heat recovery device for edible alcohol distillation equipment according to claim 2, characterized in that: The rotating ring (16) is embedded with an elastic airbag (22), which is connected to the capillary lumen through an internal airway (23); The outer wall of the inner U-tube (4) is provided with a protrusion (25) corresponding to the elastic airbag (22).

4. The waste heat recovery device for edible alcohol distillation equipment according to claim 1, characterized in that: The inlet end of the capillary tube (9) has a slanted cut structure and faces the inner wall of the U-shaped tube (3).

5. A waste heat recovery device for edible alcohol distillation equipment according to claim 1, characterized in that: The capillary tube (9) forms a composite structure with the heat-conducting section as the main body, and the heat insulation layer extends to the edge of the heat-conducting section.

6. A waste heat recovery device for edible alcohol distillation equipment according to claim 1, characterized in that: The one-way valve (11) is made of temperature-resistant and corrosion-resistant stainless steel. The surface of the temperature guide rod (13) is coated with a heat insulation coating, and the seal is made of heat-resistant rubber.

7. A waste heat recovery device for edible alcohol distillation equipment according to claim 2, characterized in that: The elastic airbag (22) is made of heat-resistant rubber. The heat insulation sleeve (12) and the heat insulation layer are made of ceramic fiber.

8. A waste heat recovery device for edible alcohol distillation equipment according to claim 3, characterized in that: The electromagnetic coils (19) are arranged in a ring array, and the polarities of adjacent permanent magnets (20) alternate with opposite polarities.

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