A waste heat recovery and recycling device and method

Abstract

This invention discloses a waste heat recovery and recycling device and method, relating to the field of RTO waste heat recovery and recycling technology. The device is divided into a separation zone, a heat exchange zone, and an exhaust zone. A gas replenishment structure is provided on the partition between the heat exchange zone and the separation zone, and a bimetallic strip is provided on the partition between the heat exchange zone and the exhaust zone. The gas replenishment structure includes a movable column and a return spring. After the RTO exhaust gas is purified in the separation zone, the hot gas enters the heat exchange zone to exchange heat with the material in the material pipe, and then flows into the exhaust zone for discharge. When there is too much hot gas, the bimetallic strip bends under heat and opens the through hole to discharge excess hot gas and prevent damage to the device. When there is insufficient hot gas, the high pressure in the separation zone pushes the movable column to compress the spring and open the through hole to replenish gas. After the hot gas stabilizes, the spring drives the movable column to return to the return position and close the through hole, maintaining the stability of the hot gas in the heat exchange zone.

Description

Technical Field

[0001] This invention relates to the field of RTO waste heat recovery and recycling technology, specifically a waste heat recovery and recycling device and method. Background Technology

[0002] The flue gas from a regenerative thermal oxidizer (RTO) carries a large amount of heat energy. Direct emission of this heat energy will pollute the environment and waste energy. By recovering the heat energy in the flue gas through convection heat exchange and preheating the materials to be burned through a pretreatment mechanism, heat circulation is achieved, which improves combustion efficiency while recovering waste heat.

[0003] However, existing waste heat recovery devices still have some shortcomings in practical applications. The amount of hot gas in the heat exchange zone of some devices cannot be balanced, resulting in an unstable heat exchange process and frequent occurrences of insufficient or excessive hot gas. When the amount of hot gas is insufficient, the heat exchange efficiency will decrease significantly, leading to poor preheating of the working material and affecting subsequent combustion efficiency. Conversely, when there is excessive hot gas, not only will it waste thermal energy, but it may also cause safety hazards due to excessive pressure in the heat exchange zone. Summary of the Invention

[0004] The purpose of this invention is to provide a waste heat recovery and recycling device and method to solve the problems in the prior art where the amount of hot air in the heat exchange zone cannot be balanced, the heat exchange process is not stable, and there are often situations where there is insufficient or excessive hot air.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The device is divided into a separation zone, a heat exchange zone, and an outlet zone in sequence. The separation zone, heat exchange zone, and outlet zone are connected in sequence. An air supply structure is provided on the partition between the heat exchange zone and the separation zone. A bimetallic strip is provided on the partition between the heat exchange zone and the outlet zone. Through holes are provided on the partitions between the heat exchange zone, the separation zone, and the outlet zone.

[0007] The air replenishment structure includes a movable column and a return spring;

[0008] The movable column is set in the through hole, and the movable column and the partition are slidably connected. The sliding direction of the movable column is from the separation zone to the heat exchange zone. One end of the return spring is fixedly connected to the movable column, and the other end of the return spring is fixedly connected to the partition.

[0009] One end of the bimetallic strip is fixedly installed on the partition on one side of the air outlet area. When the bimetallic strip is not deformed by heat, it blocks the through hole. After the bimetallic strip is deformed by heat, it bends away from the partition.

[0010] The RTO exhaust gas enters the separation zone, and the purified hot gas after separation is then introduced into the heat exchange zone and the working material in the material pipe for heat exchange. The hot gas after heat exchange is discharged into the outlet zone. During this process, the hot gas content in the heat exchange zone may be too high or too low. When the hot gas content is too high, there will be a high pressure in the heat exchange zone. At this time, the heat in the heat exchange zone will continue to rise, and the bimetallic strip will deform due to the heat, bending away from the partition. The through hole that was originally blocked by the bimetallic strip will open, allowing some of the high-temperature hot gas to quickly flow from the heat exchange zone into the outlet zone and be discharged. This prevents the excessively high temperature in the heat exchange zone from adversely affecting the working material in the material pipe or damaging the device components. When the heat content in the heat exchange zone is too low, its internal pressure decreases. However, the pressure in the separation zone is greater than that in the heat exchange zone. The heat in the separation zone pushes the movable column towards the heat exchange zone, causing the return spring to deform and gradually open the through hole. This increases the amount of air supplied from the separation zone to the heat exchange zone, thus maintaining the stability of the heat volume in the heat exchange zone. Once the heat volume stabilizes, the return spring returns to its original state, causing the movable column to reset and re-block the through hole.

[0011] Furthermore, the heat exchange zone is an S-shaped airflow channel. The inlet end of the S-shaped airflow channel is connected to the upper end of the separation zone, and the outlet end of the S-shaped airflow channel is connected to the lower end of the outlet zone. The inlet end of the S-shaped airflow channel is located above the outlet end in the vertical direction.

[0012] The S-shaped airflow channel is S-shaped in the vertical direction, and its interior forms a continuous airflow path that first goes straight, then bends and descends, and then goes straight and bends and descends again.

[0013] This design allows the pure hot air entering the heat exchange zone from the separation zone to flow along a predetermined path within the S-shaped airflow channel, extending the residence time of the hot air in the heat exchange zone. The hot air meanders through the S-shaped channel, enabling more thorough and uniform heat exchange with the material pipes arranged within the channel, significantly improving heat exchange efficiency. Simultaneously, due to the rising characteristics of the hot air, a natural temperature gradient distribution forms within the S-shaped airflow channel, decreasing from top to bottom. The temperature is highest at the upper inlet area, and as the hot air flows downwards along the S-shaped path, heat is gradually transferred to the working material within the material pipes, with a significant temperature reduction at the lower outlet area. This natural temperature gradient ensures that the material pipes come into contact with hot air of varying temperatures at different heights, avoiding localized overheating or uneven heat exchange, further guaranteeing the stability of the heat exchange process and the consistency of working material handling.

[0014] Furthermore, a material pipe is installed in the heat exchange zone. The material pipe is S-shaped in both the horizontal and vertical directions. The material pipe is installed in the S-shaped airflow channel. The outlet and inlet of the material pipe both extend out of the heat exchange zone and are connected to the outside. The inlet of the material pipe is located at the outlet end of the S-shaped airflow channel, and the inlet of the material pipe is located at the inlet end of the S-shaped airflow channel.

[0015] The material flow direction within the material pipe is opposite to the hot air flow direction within the S-shaped airflow channel, forming a highly efficient counter-current heat exchange mode. When the material enters through the inlet of the material pipe, it flows upward along the S-shaped path, while the hot air it comes into contact with flows downward from the inlet end of the S-shaped airflow channel. This ensures that the material initially contacts relatively cooler hot air. As the material moves upward, its own temperature gradually increases, and the temperature of the hot air it comes into contact with also gradually increases. This counter-current design maintains a significant temperature difference between the material in the material pipe and the hot air in the S-shaped airflow channel, greatly improving heat transfer efficiency and ensuring that the material can fully absorb heat from the hot air. This results in faster and more uniform heating or drying, allowing the material to gradually and steadily heat up throughout the heat exchange process, avoiding potential localized overheating or quality deterioration caused by sudden contact with high-temperature hot air.

[0016] Furthermore, a separator is installed in the separation zone, and the inlet of the separator and the inlet of the separation zone are connected by a connecting pipe. The conveying direction of the connecting pipe is tangent to the inner wall of the separator.

[0017] This tangential feeding design causes the RTO exhaust gas to rotate at high speed along the inner wall of the separator after entering, creating a strong centrifugal force field. Under the action of centrifugal force, denser impurities in the exhaust gas are thrown towards the inner wall of the separator and slide down along the inner wall under the action of gravity, eventually settling at the bottom of the separator, thus achieving effective separation from the pure hot gas. The less dense pure hot gas, on the other hand, will gather towards the central area of ​​the separator during rotation, forming an upward vortex, and then enter the heat exchange zone through the outlet at the top of the separator. This prevents impurities from adhering to the surface of the material pipe or clogging the channel after entering the heat exchange zone, ensuring the smooth progress of the heat exchange process and the stability of the heat exchange efficiency.

[0018] Furthermore, the separator has a tapered structure that is wider at the top and narrower at the bottom. An exhaust pipe is provided at the top of the separator, and the central axis of the exhaust pipe coincides with the central axis of the separator. The exhaust pipe is inserted into the separator, and the separator is connected to the separation zone through the exhaust pipe.

[0019] The conical separator further enhances the centrifugal separation effect. As the exhaust gas enters the separator tangentially, the rotational speed of the airflow gradually increases from top to bottom as the inner diameter of the separator gradually decreases, thus increasing the centrifugal force. This allows impurity particles to be separated more effectively and move towards the inner wall. Simultaneously, the conical bottom design facilitates the collection and discharge of separated impurity particles under gravity, reducing impurity residue inside the separator. The central axis of the exhaust pipe coincides with the central axis of the separator and is inserted into the separator. This structure allows the pure hot gas gathered in the central area of ​​the separator to enter the exhaust pipe smoothly and efficiently, avoiding the impact of airflow disturbance on the separation effect and ensuring that the hot gas entering the heat exchange zone has high purity.

[0020] Furthermore, an electronic valve is installed at the lower outlet of the separator.

[0021] After the separator has been running for a period of time, the electronic valve will automatically open, allowing impurities to be quickly discharged from the separator under the action of gravity, thus avoiding excessive impurities from affecting the separation efficiency or causing blockage.

[0022] Furthermore, each bend in the S-shaped airflow channel is arc-shaped.

[0023] The curved channel design effectively reduces the resistance of hot air during flow, reduces energy loss caused by airflow turning, allows hot air to flow more smoothly in the S-shaped channel, avoids the formation of local eddies, further ensures the stability of the heat exchange process, and extends the service life of the device.

[0024] Furthermore, each bend in the S-shaped airflow channel is provided with a through hole on the baffle.

[0025] These through-holes work in conjunction with the air-injection structure and the bimetallic strip. When there is too much hot air, the bimetallic strip deforms due to heat and opens the through-holes at the corresponding bends to release excess hot air in time. When there is insufficient hot air, the pressure in the separation zone pushes the movable column to open the through-holes at the corresponding bends to inject air. This allows for precise control of the amount of hot air in different sections of the S-shaped airflow channel, ensuring the uniformity and stability of the hot air distribution in the entire heat exchange zone and further improving the heat exchange effect.

[0026] Furthermore, a method for using a waste heat recovery and recycling device includes the following steps:

[0027] S1, RTO exhaust gas enters the separator from the inlet of the separation zone for separation. The separated pure hot gas flows out from the top outlet of the separator and re-enters the separation zone. The separated impurities fall to the bottom of the separator. The electronic valve opens periodically to discharge the impurities.

[0028] S2. The separated pure hot gas flows into the S-shaped airflow channel. The direction of hot gas flow in the S-shaped airflow channel is opposite to the direction of material flow in the material pipe. Under the natural rising effect of the hot gas, the temperature of the S-shaped airflow channel decreases continuously from top to bottom, forming countercurrent heat exchange.

[0029] S3. When there is insufficient hot air in the S-shaped airflow channel, there is a pressure difference between the separation zone and the heat exchange zone on both sides of the air replenishment structure. Under the action of the hot air pressure in the separation zone, the movable column overcomes the elastic force of the return spring and moves towards the heat exchange zone, so that the separation zone and the heat exchange zone are connected through the gap between the movable column and the partition, thus realizing air replenishment. When the pressure in the heat exchange zone returns to the preset value, the return spring pushes the movable column to reset and closes the air replenishment channel.

[0030] S4. When there is too much hot air in the S-shaped airflow channel, the bimetallic strip is heated and bent and deformed. Its free end moves towards the outlet area, opening the pressure relief channel between the heat exchange zone and the outlet area, allowing some hot air to directly enter the outlet area from the pressure relief channel, thus avoiding excessive pressure in the heat exchange zone. When the hot air pressure in the S-shaped airflow channel returns to normal, the bimetallic strip returns to its original shape and closes the pressure relief channel.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention achieves dynamic balance of hot gas volume within the heat exchange zone by incorporating a gas replenishment structure and a bimetallic strip. When the hot gas is insufficient, the pressure difference between the separation zone and the heat exchange zone drives the movable column to move and open the gas replenishment channel, promptly replenishing the hot gas. When the hot gas is excessive, the bimetallic strip deforms due to heat, opening the pressure relief channel to release the excess hot gas. This effectively solves the problem of unstable heat exchange process in existing technologies, ensuring heat exchange efficiency and safe operation of the device.

[0033] 2. The design of the S-shaped airflow channel and S-shaped material pipe forms a highly efficient counter-current heat exchange, which prolongs the residence time of hot gas and the heat exchange path. Combined with the naturally formed temperature gradient, it makes the heat exchange between the working material and the hot gas more thorough and uniform, improving the preheating effect of the working material and the energy utilization rate.

[0034] 3. The separator adopts tangential feeding and a conical structure, which uses centrifugal force to efficiently separate impurities in the exhaust gas, avoiding impurities from entering the heat exchange zone and affecting heat exchange efficiency or clogging the channel. The electronic valve enables the periodic automatic discharge of impurities, ensuring the continuous stability of the separation process. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the internal partitioning of the present invention;

[0037] Figure 3 This is a cross-sectional schematic diagram of the internal structure of each region of the present invention;

[0038] Figure 4 This is another cross-sectional schematic diagram of the internal structure of each region of the present invention;

[0039] Figure 5 This is a schematic diagram of the gas-injection structure of the present invention;

[0040] Figure 6 This is a schematic diagram of the external structure of the material tube of the present invention;

[0041] Figure 7 This is a schematic diagram of the external structure of the separator of the present invention;

[0042] Figure 8for Figure 3 A magnified view of part A;

[0043] Figure 9 for Figure 3 A magnified schematic diagram of part B.

[0044] In the diagram: 1. Separation zone; 2. Heat exchange zone; 3. Gas outlet zone; 4. Gas supply structure; 5. Bimetallic strip; 6. Material pipe; 11. Separator; 12. Connecting pipe; 13. Gas outlet pipe; 14. Electronic valve; 21. Through hole; 22. S-shaped airflow channel; 41. Movable column; 42. Return spring. Detailed Implementation

[0045] 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.

[0046] Example: Figure 1 - Figure 9 As shown, the present invention provides a technical solution: a waste heat recovery and recycling device and method.

[0047] like Figures 1 to 3 , Figure 5 , Figure 8 and Figure 9 As shown, the device is divided into a separation zone 1, a heat exchange zone 2 and an outlet zone 3 in sequence. The separation zone 1, the heat exchange zone 2 and the outlet zone 3 are connected in sequence. An air supply structure 4 is provided on the partition between the heat exchange zone 2 and the separation zone 1. A bimetallic strip 5 is provided on the partition between the heat exchange zone 2 and the outlet zone 3. Through holes 21 are provided on the partitions between the heat exchange zone 2 and the separation zone 1 and the outlet zone 3.

[0048] The air replenishment structure 4 includes a movable column 41 and a return spring 42;

[0049] The movable column 41 is set in the through hole 21. The movable column 41 is slidably connected to the partition plate. The sliding direction of the movable column 41 is from the separation zone 1 to the heat exchange zone 2. One end of the return spring 42 is fixedly connected to the movable column 41, and the other end of the return spring 42 is fixedly connected to the partition plate.

[0050] One end of the bimetallic strip 5 is fixedly installed on the partition plate on one side of the air outlet zone 3. When the bimetallic strip 5 is not deformed by heat, it blocks the through hole 21. After the bimetallic strip 5 is deformed by heat, it bends away from the partition plate.

[0051] The RTO exhaust gas is introduced into separation zone 1. The purified hot gas after separation is introduced into heat exchange zone 2 and the working material in material pipe 6 for heat exchange. The hot gas after heat exchange is discharged into outlet zone 3. During this process, the hot gas content in heat exchange zone 2 may be too high or too low. When the hot gas content is too high, there will be a high pressure in heat exchange zone 2. At this time, the heat in heat exchange zone 2 will continue to rise. The bimetallic strip 5 will deform due to the heat and bend away from the partition. The through hole 21, which was originally blocked by the bimetallic strip 5, will open, allowing some of the high-temperature hot gas to flow from heat exchange zone 2 into outlet zone 3 and be discharged quickly. This prevents the excessively high temperature in heat exchange zone 2 from adversely affecting the working material in material pipe 6 or damaging the device components. When the heat content in heat exchange zone 2 is too low, its internal pressure decreases. Meanwhile, the pressure in separation zone 1 is greater than the internal pressure in heat exchange zone 2. The heat in separation zone 1 will push the movable column 41 to slide towards heat exchange zone 2, gradually opening the through hole 21 and increasing the amount of air supplied from separation zone 1 to heat exchange zone 2, so as to maintain the stability of the heat content in heat exchange zone 2.

[0052] like Figure 3 As shown, the heat exchange zone 2 is an S-shaped airflow channel 22. The inlet end of the S-shaped airflow channel 22 is connected to the upper end of the separation zone 1, and the outlet end of the S-shaped airflow channel 22 is connected to the lower end of the air outlet zone 3. The inlet end of the S-shaped airflow channel 22 is located above the outlet end in the vertical direction.

[0053] The S-shaped airflow channel 22 is S-shaped in the vertical direction, and its interior forms a continuous airflow path that first goes straight, then bends and descends, and then goes straight and bends and descends again.

[0054] This design allows the pure hot air entering the heat exchange zone 2 from the separation zone 1 to flow along a predetermined path within the S-shaped airflow channel 22, extending the residence time of the hot air in the heat exchange zone 2. The hot air meanders through the S-shaped channel, enabling more thorough and uniform heat exchange with the material pipes 6 arranged within the channel, significantly improving heat exchange efficiency. Simultaneously, due to the rising characteristics of the hot air, a natural temperature gradient distribution forms within the S-shaped airflow channel 22, with temperatures decreasing from top to bottom. The temperature is highest at the upper inlet area, and as the hot air flows downward along the S-shaped path, heat is gradually transferred to the working material within the material pipes 6, with the temperature significantly decreasing at the lower outlet area. This natural temperature gradient ensures that the material pipes 6 come into contact with hot air of different temperatures at different heights, avoiding localized overheating or uneven heat exchange, further guaranteeing the stability of the heat exchange process and the consistency of working material handling.

[0055] like Figure 3 , Figure 4 and Figure 6As shown, a material pipe 6 is provided in the heat exchange zone 2. The material pipe 6 is S-shaped in both the horizontal and vertical directions. The material pipe 6 is set in the S-shaped airflow channel 22. The outlet and inlet of the material pipe 6 both pass through the heat exchange zone 2 and are connected to the outside. The inlet of the material pipe 6 is located at the outlet end of the S-shaped airflow channel 22, and the inlet of the material pipe 6 is located at the inlet end of the S-shaped airflow channel 22.

[0056] The flow direction of the working material in the material pipe 6 is opposite to the flow direction of the hot air in the S-shaped airflow channel 22, forming a highly efficient counter-current heat exchange mode. When the working material enters from the inlet of the material pipe 6, it flows upward along the S-shaped path, while the hot air it comes into contact with flows downward from the inlet end of the S-shaped airflow channel 22. This ensures that the working material initially comes into contact with relatively low-temperature hot air. As the working material moves upward, its own temperature gradually increases, and the temperature of the hot air it comes into contact with also increases. This counter-current design maintains a large temperature difference between the working material in the material pipe 6 and the hot air in the S-shaped airflow channel 22, greatly improving heat transfer efficiency and ensuring that the working material can fully absorb the heat from the hot air. This results in faster and more uniform heating or drying, allowing the working material to gradually and steadily heat up throughout the heat exchange process, avoiding potential localized overheating or quality deterioration caused by sudden contact with high-temperature hot air.

[0057] like Figure 2 and Figure 3 As shown, a separator 11 is provided in the separation zone 1. The inlet of the separator 11 and the inlet of the separation zone 1 are connected by a connecting pipe 12. The conveying direction of the connecting pipe 12 is tangent to the inner wall of the separator 11.

[0058] This tangential feeding design causes the RTO exhaust gas to rotate at high speed along the inner wall of separator 11 after entering the separator 11, forming a strong centrifugal force field. Under the action of centrifugal force, the denser impurities in the exhaust gas are thrown towards the inner wall of separator 11 and slide down along the inner wall under the action of gravity, eventually settling at the bottom of separator 11, thus achieving effective separation from the pure hot gas. The less dense pure hot gas will gather towards the central area of ​​separator 11 during the rotation, forming an upward vortex, and then enter the heat exchange zone 2 through the outlet at the top of separator 11. This prevents impurities from adhering to the surface of material pipe 6 or clogging the channel after entering heat exchange zone 2, ensuring the smooth progress of the heat exchange process and the stability of heat exchange efficiency.

[0059] like Figure 2 and Figure 7 As shown, the separator 11 has a tapered structure that is wider at the top and narrower at the bottom. An air outlet pipe 13 is provided at the top of the separator 11. The central axis of the air outlet pipe 13 coincides with the central axis of the separator 11. The air outlet pipe 13 is inserted into the separator 11, and the separator 11 is connected to the separation zone 1 through the air outlet pipe 13.

[0060] The conical separator 11 further enhances the centrifugal separation effect. When the exhaust gas enters the separator 11 tangentially, as the inner diameter of the separator 11 gradually decreases from top to bottom, the rotational speed of the airflow continuously increases, and the centrifugal force also increases, allowing impurity particles to be separated more effectively and move towards the inner wall. Simultaneously, the conical bottom design facilitates the collection and discharge of separated impurity particles under gravity, reducing impurity residue inside the separator 11. The central axis of the exhaust pipe 13 coincides with the central axis of the separator 11 and is inserted inside the separator 11. This structure allows the pure hot gas gathered in the central region of the separator 11 to enter the exhaust pipe 13 smoothly and efficiently, avoiding the impact of airflow disturbance on the separation effect and ensuring that the hot gas entering the heat exchange zone 2 has high purity.

[0061] like Figure 7 As shown, an electronic valve 14 is installed at the lower outlet of the separator 11.

[0062] After the separator 11 has been running for a period of time, the electronic valve 14 will automatically open, allowing impurities to be quickly discharged from the separator 11 under the action of gravity, thus avoiding excessive impurities from affecting the separation efficiency or causing blockage.

[0063] like Figure 3 As shown, each bend in the S-shaped airflow channel 22 is arc-shaped.

[0064] The curved channel design effectively reduces the resistance of hot air during flow, reduces energy loss caused by airflow turning, allows hot air to flow more smoothly in the S-shaped channel, avoids the formation of local eddies, further ensures the stability of the heat exchange process, and extends the service life of the device.

[0065] like Figure 2 As shown, each bend of the S-shaped airflow channel 22 has a through hole 21 on the baffle plate.

[0066] These through holes 21 work in conjunction with the air replenishment structure 4 and the bimetallic strip 5. When there is too much hot air, the bimetallic strip 5 deforms due to heat and opens the through holes 21 at the corresponding bends to release excess hot air in time. When there is insufficient hot air, the pressure in the separation zone 1 pushes the movable column 41 to open the through holes 21 at the corresponding bends to replenish air. This allows for precise control of the amount of hot air in different sections of the S-shaped airflow channel 22, ensuring the uniformity and stability of the hot air distribution in the entire heat exchange zone 2 and further improving the heat exchange effect.

[0067] A method for using a waste heat recovery and recycling device, comprising the following steps:

[0068] S1. The RTO exhaust gas enters the separator 11 from the inlet of the separation zone 1 for separation. The separated pure hot gas flows out from the top outlet of the separator 11 and re-enters the separation zone 1. The separated impurities fall into the bottom of the separator 11. The electronic valve 14 opens periodically to discharge the impurities.

[0069] S2. The separated pure hot gas flows into the S-shaped airflow channel 22. The direction of hot gas flow in the S-shaped airflow channel 22 is opposite to the direction of material flow in the material pipe 6. Under the natural rising effect of the hot gas, the temperature of the S-shaped airflow channel 22 continuously decreases from top to bottom, forming countercurrent heat exchange.

[0070] S3. When the hot air in the S-shaped airflow channel 22 is insufficient, there is a pressure difference between the two sides of the air replenishment structure 4 due to the pressure in the separation zone 1 and the heat exchange zone 2. Under the action of the hot air pressure in the separation zone 1, the movable column 41 overcomes the elastic force of the return spring 42 and moves towards the heat exchange zone 2, so that the separation zone 1 and the heat exchange zone 2 are connected through the gap between the movable column 41 and the partition, thus realizing air replenishment. When the pressure in the heat exchange zone 2 returns to the preset value, the return spring 42 pushes the movable column 41 to reset and closes the air replenishment channel.

[0071] S4. When there is too much hot air in the S-shaped airflow channel 22, the bimetallic strip 5 is heated and bent and deformed. Its free end moves towards the outlet zone 3, opening the pressure relief channel between the heat exchange zone 2 and the outlet zone 3, so that some hot air can directly enter the outlet zone 3 from the pressure relief channel, avoiding excessive pressure in the heat exchange zone 2. When the hot air pressure in the S-shaped airflow channel 22 returns to normal, the bimetallic strip 5 returns to its original shape and closes the pressure relief channel.

[0072] The working principle of this invention is as follows: The exhaust gas from the RTO is introduced into the separation zone 1. The purified hot gas after separation is then introduced into the heat exchange zone 2 and the working material in the material pipe 6 for heat exchange. The hot gas after heat exchange is discharged into the outlet zone 3. During this process, the hot gas content in the heat exchange zone 2 may be too high or too low. When the hot gas content is too high, there will be a high pressure in the heat exchange zone 2. At this time, the heat in the heat exchange zone 2 will continuously increase, and the bimetallic strip 5 will deform due to the heat, bending away from the partition. The through hole 21, which was originally blocked by the bimetallic strip 5, will then open, allowing some of the high-temperature hot gas to quickly flow from the heat exchange zone 2 into the outlet zone 3 and be discharged. This prevents the excessively high temperature in the heat exchange zone 2 from adversely affecting the working material in the material pipe 6 or damaging the device components. When the heat content in heat exchange zone 2 is too low, its internal pressure decreases. Meanwhile, the pressure in separation zone 1 is greater than the internal pressure in heat exchange zone 2. The heat in separation zone 1 will push the movable column 41 to slide towards heat exchange zone 2. The return spring 42 will deform and gradually open the through hole 21, increasing the amount of air supplied from separation zone 1 to heat exchange zone 2 to maintain the stability of the heat volume in heat exchange zone 2. When the heat volume is stable, the return spring 42 returns to its original state, driving the movable column 41 to reset and re-block the through hole 21.

[0073] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waste heat recovery and recycling device, the device being sequentially divided into a separation zone (1), a heat exchange zone (2), and an exhaust zone (3), wherein the separation zone (1), the heat exchange zone (2), and the exhaust zone (3) are sequentially connected, characterized in that: A gas supply structure (4) is provided on the partition between the heat exchange zone (2) and the separation zone (1), a bimetallic strip (5) is provided on the partition between the heat exchange zone (2) and the gas outlet zone (3), and through holes (21) are provided on the partitions between the heat exchange zone (2) and the separation zone (1) and the gas outlet zone (3). The air replenishment structure (4) includes a movable column (41) and a return spring (42). The movable column (41) is disposed in the through hole (21). The movable column (41) is slidably connected to the partition plate. The sliding direction of the movable column (41) is from the separation zone (1) to the heat exchange zone (2). One end of the reset spring (42) is fixedly connected to the movable column (41), and the other end of the reset spring (42) is fixedly connected to the partition plate. One end of the bimetallic strip (5) is fixedly installed on the partition plate on one side of the gas outlet area (3). When the bimetallic strip (5) is not deformed by heat, it blocks the through hole (21). After the bimetallic strip (5) is deformed by heat, it bends away from the partition plate.

2. The waste heat recovery and recycling device according to claim 1, characterized in that: The heat exchange zone (2) is an S-shaped airflow channel (22). The inlet end of the S-shaped airflow channel (22) is connected to the upper end of the separation zone (1), and the outlet end of the S-shaped airflow channel (22) is connected to the lower end of the air outlet zone (3). The inlet end of the S-shaped airflow channel (22) is located above the outlet end in the vertical direction.

3. The waste heat recovery and recycling device according to claim 2, characterized in that: A material pipe (6) is provided in the heat exchange zone (2). The material pipe (6) is S-shaped in both the horizontal and vertical directions. The material pipe (6) is located in the S-shaped airflow channel (22). The outlet and inlet of the material pipe (6) both pass through the heat exchange zone (2) and communicate with the outside. The inlet of the material pipe (6) is located at the outlet end of the S-shaped airflow channel (22), and the inlet of the material pipe (6) is located at the inlet end of the S-shaped airflow channel (22).

4. The waste heat recovery and recycling device according to claim 3, characterized in that: A separator (11) is provided in the separation zone (1). The inlet of the separator (11) and the inlet of the separation zone (1) are connected by a connecting pipe (12). The conveying direction of the connecting pipe (12) is tangent to the inner wall of the separator (11).

5. The waste heat recovery and recycling device according to claim 4, characterized in that: The separator (11) is a tapered structure that is wider at the top and narrower at the bottom. An air outlet pipe (13) is provided at the top of the separator (11). The central axis of the air outlet pipe (13) coincides with the central axis of the separator (11). The air outlet pipe (13) is inserted into the separator (11). The separator (11) is connected to the separation zone (1) through the air outlet pipe (13).

6. The waste heat recovery and recycling device according to claim 5, characterized in that: An electronic valve (14) is provided at the lower outlet of the separator (11).

7. A waste heat recovery and recycling device according to claim 6, characterized in that: Each bend of the S-shaped airflow channel (22) is arc-shaped.

8. The waste heat recovery and recycling device according to claim 7, characterized in that: Each bend of the S-shaped airflow channel (22) is provided with a through hole (21) on the partition.

9. A method of using the waste heat recovery and recycling device according to claim 8, characterized in that: The method of use includes the following steps: S1. The exhaust gas from the RTO enters the separator (11) through the inlet of the separation zone (1) for separation. The pure hot gas after separation flows out from the top outlet of the separator (11) and re-enters the separation zone (1). The impurities after separation fall into the bottom of the separator (11). The electronic valve (14) opens periodically to discharge the impurities. S2. The separated pure hot gas flows into the S-shaped airflow channel (22). The direction of hot gas flow in the S-shaped airflow channel (22) is opposite to the direction of material flow in the material pipe (6). Under the natural rising effect of the hot gas, the temperature of the S-shaped airflow channel (22) decreases continuously from top to bottom, forming countercurrent heat exchange. S3. When the hot air in the S-shaped airflow channel (22) is insufficient, there is a pressure difference between the two sides of the air replenishment structure (4) and the pressure in the separation zone (1) and the heat exchange zone (2). Under the action of the hot air pressure in the separation zone (1), the movable column (41) overcomes the elastic force of the reset spring (42) and moves towards the heat exchange zone (2), so that the separation zone (1) and the heat exchange zone (2) are connected through the gap between the movable column (41) and the partition, and air replenishment is realized. When the pressure in the heat exchange zone (2) is restored to the preset value, the reset spring (42) pushes the movable column (41) to reset and closes the air replenishment channel. S4. When there is too much hot air in the S-shaped airflow channel (22), the bimetallic strip (5) is heated and bent and deformed. Its free end moves towards the outlet area (3), opening the pressure relief channel between the heat exchange area (2) and the outlet area (3), so that some hot air can directly enter the outlet area (3) from the pressure relief channel, avoiding excessive pressure in the heat exchange area (2). When the hot air pressure in the S-shaped airflow channel (22) returns to normal, the bimetallic strip (5) returns to its original state and closes the pressure relief channel.

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