Thermal energy recovery device for cascade reuse of waste heat from exhaust gas of biogas internal combustion engine

Abstract

Disclosed in the present invention is a thermal energy recovery device for cascade reuse of waste heat from exhaust gas of a biogas internal combustion engine. The thermal energy recovery device comprises an exhaust gas conveying duct, wherein the exhaust gas conveying duct is provided with a heat-exchange cavity; a plurality of tower-shaped spiral heat-exchange pipes are arranged in the heat-exchange cavity, the plurality of heat-exchange pipes are vertically distributed in sequence, and the heat-exchange pipes are corrugated pipes; and a power rod is provided in the middle of the heat-exchange pipes. In the present invention, by means of providing a vibration electric motor and a power rod in the exhaust gas conveying duct, the power rod can guide and transfer, by means of a rigid connecting structure or a flexible connecting structure, the driving force of the vibration electric motor to the tower-shaped spiral heat-exchange pipes capable of stretching and compressing, and the heat-exchange pipes can thus vibrate and oscillate up and down during heat-exchange operations, such that water flowing therein can be driven to churn up and down, allowing the water flowing in the pipes to be in more sufficient and uniform contact with the inner walls of the heat-exchange pipes. Thus, the water is heated more evenly, effectively improving the overall heat-exchange effect.

Description

A heat recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust. Technical Field

[0001] This invention relates to the field of heat energy recovery technology, and in particular to a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust. Background Technology

[0002] Biogas is often supplied to internal combustion engine units from storage tanks via desulfurizers. The internal combustion engine units then generate kinetic energy through the combustion of biogas to drive other external equipment to perform corresponding operations, such as generator sets. However, the exhaust gas produced after the biogas combustion will be emitted by the internal combustion engine. In order to save energy, in existing related technologies, heat recovery devices are usually installed at the exhaust gas emission end of the biogas internal combustion engine.

[0003] In related technologies, the waste heat recovery device for biogas internal combustion engines typically involves fixing heat exchange pipes inside the waste gas discharge pipes for heat exchange, thereby recovering waste heat energy from the waste gas. In this technical solution, the fixed heat exchange pipes provide a smooth flow space for the heat exchange liquid, resulting in good heating effect on the end of the heat exchange pipe facing the high-temperature waste gas, while the heating effect on the end facing away from the high-temperature waste gas is poor. This will cause uneven heating of the heat exchange liquid flowing through the heat exchange pipes, resulting in poor overall heat recovery effect.

[0004] In addition, to ensure the effectiveness of waste heat recovery, related technologies typically require wrapping insulation cotton or other insulation structures around the pipelines after heat exchange to reduce temperature loss. While this method can meet the insulation requirements of conventional heat recovery, conventional insulation measures can only provide basic insulation for the pipelines after heat exchange and cannot provide auxiliary insulation measures for heating and warmth. Therefore, some temperature loss still occurs in the pipelines after heat exchange. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the problem that the waste heat recovery device of biogas internal combustion engine adopts a fixed heat exchange pipeline in the prior art, which causes the heat exchange liquid flowing in the heat exchange pipeline to be not heated evenly, resulting in poor overall heat energy recovery effect, the present invention provides a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas, including an exhaust gas conveying pipeline with a heat exchange chamber inside, wherein a plurality of tower-shaped spiral heat exchange pipelines distributed vertically are arranged in the heat exchange chamber and a vibration unit for driving the heat exchange pipelines to vibrate so as to shake the heat exchange medium inside.

[0007] The heat exchange pipeline near the air inlet of the heat exchange chamber is the front heat exchange pipeline, and the heat exchange pipeline near the exhaust end of the heat exchange chamber is the rear heat exchange pipeline. The heat output end of the rear heat exchange pipeline surrounds the heat output end of the front heat exchange pipeline.

[0008] The vibration unit includes a vibration motor, a power rod connected to the output end of the vibration motor and passing through the middle of multiple heat exchange pipes, and a connecting structure connecting the heat exchange pipes and the power rod.

[0009] Furthermore, the connection structure is a rigid connection structure, which is a branch rod connecting the heat exchange pipeline and the power source.

[0010] Furthermore, the connection structure is a flexible connection structure, which includes a side support rod, an elastic telescopic member connected to the lower end face of the side support rod, and a gasket connected to the end of the elastic telescopic member opposite to the side support rod.

[0011] Furthermore, the expansion and contraction strength of the multiple elastic expansion components gradually decreases from bottom to top.

[0012] Furthermore, the multiple heat exchange pipelines include a primary heat exchanger, a secondary heat exchanger, a tertiary heat exchanger, and a quaternary heat exchanger arranged sequentially from bottom to top. The primary and secondary heat exchanger pipelines are the front heat exchange pipelines, and the tertiary and quaternary heat exchanger pipelines are the rear heat exchange pipelines. The heat output end of the tertiary heat exchanger surrounds the heat output end of the primary heat exchanger, and the heat output end of the quaternary heat exchanger surrounds the heat output end of the secondary heat exchanger.

[0013] Furthermore, it also includes a five-stage heat exchange tube, with the heat output end of the five-stage heat exchange tube surrounding the exhaust gas delivery pipeline.

[0014] Furthermore, heat exchange extension fins are formed on both the inner and outer side walls of the heat exchange pipeline.

[0015] Furthermore, the heat exchange extension fins have a wave-like structure, and ventilation holes are opened at the peaks of the waves.

[0016] Furthermore, a side heat exchange network is provided between the heat exchange chamber wall and the heat exchange pipeline. The upper end of the side heat exchange network is connected to a water inlet pipe, and the lower end is connected to a discharge pipe.

[0017] Furthermore, a front fan is installed at the air inlet end of the heat exchange chamber, and a rear fan is installed at the exhaust end of the heat exchange chamber.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention, by equipping the exhaust gas conveying pipeline with a vibrating motor and a power rod, allows the power rod to guide and transmit the driving force of the vibrating motor to the tower-shaped spiral heat exchange pipeline, which can extend and contract, through a rigid or flexible connection structure. This causes the heat exchange pipeline to vibrate and sway during heat exchange operations, thereby causing the water flowing inside to tumble and roll. This allows the water flowing inside the pipeline to adhere more fully and evenly to the inner wall of the heat exchange pipeline, making its heating area more uniform and effectively improving the overall heat exchange effect. Furthermore, it can create a turbulence effect on the surrounding high-temperature exhaust gas flow, which not only increases the overall heat exchange contact area between the high-temperature exhaust gas and the heat exchange pipeline, but also extends the contact time between the high-temperature exhaust gas and the heat exchange pipeline, effectively improving its heat recovery effect.

[0020] 2. This invention arranges multiple heat exchange pipes within the heat exchange chamber. These vertically distributed pipes sequentially exchange heat with the waste gas flowing within the chamber. Since the heat recovery effect of the upstream heat exchange pipes is better, they are used as the primary heat recovery equipment. The heat recovery effect of the downstream heat exchange pipes is poor, so the heat recovered from the downstream pipes is used to provide auxiliary insulation for the heat recovery pipes of the upstream heat exchange pipes. Furthermore, conventional insulation measures such as insulation cotton are applied to their outer perimeter. Therefore, it can further ensure that the heat energy of the heat recovery pipes is not easily lost after heat exchange, making the overall heat recovery effect more ideal. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 is a schematic diagram of the thermal energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0023] Figure 2 is a rear view of a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0024] Figure 3 is a side view of a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0025] Figure 4 is a schematic diagram of the heat exchange pipeline in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0026] Figure 5 is a cross-sectional view of the heat exchange chamber in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0027] Figure 6 is a schematic diagram of the structural distribution of the side-displacement heat network in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0028] Figure 7 is a schematic diagram of the structural distribution of the front fan and the rear fan in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0029] Figure 8 is a schematic diagram of the structural connection of the heat exchange pipeline and the power rod in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0030] Figure 9 is a schematic diagram of the structural connection between the primary heat exchange tube and the power rod in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0031] Figure 10 is a schematic diagram of the structural connection of heat exchange pipeline and elastic expansion joint in a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0032] Figure 11 is a schematic diagram of the structural distribution of the power rod and elastic telescopic component in the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0033] Figure 12 is an enlarged schematic diagram of the structure at point A in Figure 11 of the heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to the present invention.

[0034] In the diagram: 1. Exhaust gas conveying pipeline; 101. Heat exchange chamber; 102. Inlet end; 103. Exhaust end; 2. Heat exchange pipeline; 201. Primary heat exchange tube; 202. Secondary heat exchange tube; 203. Tertiary heat exchange tube; 204. Quaternary heat exchange tube; 205. Fifth stage heat exchange tube; 206. Heat exchange extension fins; 3. Side heat exchange network; 301. Water inlet pipe; 302. Discharge pipe; 4. Temperature sensor; 5. Front fan; 6. Rear fan; 7. Power rod; 8. Branch rod; 9. Vibration motor; 10. Connecting seat; 11. Side support rod; 12. Elastic telescopic component; 13. Gasket. Detailed Implementation

[0035] The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner. Therefore, they only show the components relevant to the invention, and directions and references, such as up, down, left, right, etc., are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0036] Example 1:

[0037] As shown in Figures 1-3, the present invention is a heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas, including an exhaust gas conveying pipeline 1 with an internal heat exchange chamber 101. The heat exchange chamber 101 is provided with multiple tower-shaped spiral heat exchange pipelines 2 arranged vertically and vertically, and a vibration unit for driving the heat exchange pipelines 2 to vibrate and shake the heat exchange medium inside. The upper end of the tower-shaped spiral heat exchange pipeline 2 is the small end, and the lower end is the large end.

[0038] The vibration unit includes a vibration motor 9, a power rod 7 connected to the output end of the vibration motor 9 and passing through the middle of multiple heat exchange pipes 2, and a connecting structure connecting the heat exchange pipes 2 and the power rod 7. The vibration motor 9 is fixedly installed at the center of the exhaust gas conveying pipe 1 via a connecting support 10. The power rod 7 extends vertically, and the connecting structure is provided between the upper end of each heat exchange pipe 2 and the power rod 7. The heat exchange pipe 2 is a corrugated pipe that can extend and contract. The power rod 7 can vibrate up and down under the drive of the vibration motor 9, and transmit the vibration force to the upper end of the tower-shaped spiral heat exchange pipe 2 through the connecting structure, so that the tower-shaped spiral heat exchange pipe 2 can vibrate up and down, thereby creating an agitation effect on the heat exchange liquid flowing in it, allowing the heat exchange liquid to sway up and down in the pipe and fully contact the pipe wall of the heat exchange pipe. This allows the heat exchange fluid to complete a uniform and sufficient heat exchange operation, effectively improving the overall heat exchange effect. In addition, during the up-and-down vibration of the tower-shaped spiral heat exchange pipe 2, it will also interfere with the surrounding high-temperature exhaust gas. Under the contraction and expansion oscillation of the tower-shaped spiral heat exchange pipe 2, the normally flowing air will generate turbulence, disturbance, or turbulence, which can not only increase the overall heat exchange contact area between the high-temperature exhaust gas and the heat exchange pipe 2, but also prolong the contact time between the high-temperature exhaust gas and the heat exchange pipe 2, effectively improving its heat recovery effect.

[0039] One end of the heat exchange chamber 101 is the air inlet end 102, and the other end is the exhaust end 103. The heat exchange pipe 2 adjacent to the air inlet end 102 of the heat exchange chamber 101 is the front heat exchange pipe, and the heat exchange pipe 2 adjacent to the exhaust end 103 of the heat exchange chamber 101 is the rear heat exchange pipe. The heat output end of the rear heat exchange pipe surrounds the heat output end of the front heat exchange pipe.

[0040] This embodiment provides a post-heat exchange pipeline for secondary heat exchange of exhaust gas after primary heat exchange, and utilizes the heat energy recovered from the secondary heat exchange to provide auxiliary insulation for the heat energy from the primary heat exchange. This further ensures that the temperature of the pipeline does not easily lose after heat exchange, thus solving the problem of temperature loss in the pipeline after heat exchange in conventional insulation measures such as insulation cotton, which can only provide basic insulation for the pipeline after heat exchange and cannot provide auxiliary insulation for the pipeline after heat exchange. Therefore, there is still a certain degree of temperature loss in the pipeline after heat exchange. The overall idea of ​​this embodiment to solve the above problem is: By arranging multiple heat exchange pipes 2 inside the heat exchange chamber 101, the exhaust gas flowing inside the heat exchange chamber 101 is exchanged with heat by multiple vertically distributed heat exchange pipes 2 in sequence. Since the heat recovery effect of the front heat exchange pipe 2 is better, it is used as the primary heat recovery device. The heat recovery effect of the rear heat exchange pipe 2 is poor. Therefore, the heat energy recovered by the rear heat exchange pipe 2 is used to provide auxiliary heat preservation measures for the heat recovery pipe of the front heat exchange pipe 2. Then, conventional heat preservation measures such as heat insulation cotton are wrapped around it. Therefore, it can further ensure that the heat energy of the heat recovery pipe after heat exchange is not easily lost, and the overall heat recovery effect is more ideal.

[0041] In some examples, as shown in Figures 8 and 9, the connection structure is a rigid connection structure, which is a branch rod 8 connecting the heat exchange pipeline 2 and the power source. The power rod 7 is set vertically, and the branch rod 8 is set horizontally.

[0042] In some examples, as shown in Figures 10-12, the connection structure is a flexible connection structure, which includes a side support rod 11, an elastic expansion member 12 connected to the lower end face of the side support rod 11, and a gasket 13 rotatably connected to the end of the elastic expansion member 12 away from the side support rod 11. The gasket 13 abuts against the tower-shaped spiral heat exchange pipeline 2, and the elastic expansion member 12 can provide a buffering effect.

[0043] In some examples, the expansion and contraction strength of multiple elastic expansion members 12 gradually decreases from bottom to top. The elastic expansion members 12 can be spring rods. Due to the different expansion and contraction strengths of the elastic expansion members 12, the vibration force transmitted by the power rod 7 to the tower-shaped spiral heat exchange pipe 2 will be different. For example, if the expansion and contraction strength of the elastic expansion members 12 decreases from bottom to top, and the expansion and contraction strength of the lower elastic expansion members 12 is large, it will only undergo expansion and contraction deformation when subjected to a larger force. Therefore, the transmission efficiency of the lower elastic expansion members 12 is higher than that of the upper elastic expansion members 12. The expansion joint 12 will result in the strongest vibration effect on the first-stage heat exchange tube 201 connected to the lower elastic expansion joint 12, and the weakest vibration effect on the fifth-stage heat exchange tube 205 connected to the upper elastic expansion joint 12. The idea behind this specific embodiment is that, since the high-temperature exhaust gas enters from the bottom of the exhaust gas conveying pipeline 1 and exits from the top, when the high-temperature exhaust gas flows upward through the heat exchange chamber 101, it will interact with the first-stage heat exchange tube 201, the second-stage heat exchange tube 202, the third-stage heat exchange tube 203, the fourth-stage heat exchange tube 204, and the fifth-stage heat exchange tube 205. 05. Contact is made one by one, and the heat exchanger gradually slows down under the obstruction of the first-stage heat exchanger 201, second-stage heat exchanger 203, fourth-stage heat exchanger 204, and fifth-stage heat exchanger 205. The first-stage heat exchanger 201, located at the bottom, is the first to come into contact with the high-temperature exhaust gas. Under the transmission effect of the power rod 7 and the flexible connection structure, it vibrates and shakes in a way that matches the flow rate of the high-temperature exhaust gas. This allows the first-stage heat exchanger 201 to violently collide with the high-velocity high-temperature exhaust gas, thereby efficiently completing the heat exchange operation. The high-temperature exhaust gas, which is blocked and slowed down by tube 201, will come into contact with the secondary heat exchange tube 202. Under the transmission effect of the power rod 7 and the flexible connection structure, the secondary heat exchange tube 202 can also vibrate and sway in a way that matches the flow rate of the initially slowed-down high-temperature exhaust gas. Therefore, the secondary heat exchange tube 202 can also complete the corresponding efficient heat exchange operation. Similarly, the exhaust gas velocity when flowing through the fifth-stage heat exchange tube 205 has been reduced, and the vibration and swaying force of the fifth-stage heat exchange tube 205 is matched with the exhaust gas velocity, so it can also produce a relatively efficient heat exchange effect.

[0044] This embodiment provides a heat recovery device with a built-in vibration unit to drive the heat exchange pipeline to produce uniform or uneven vibration and shaking effects, thereby increasing the overall heat recovery effect. It solves the problem in existing technologies where conventional heat exchange pipelines typically use static heat exchange pipelines to provide a flow path for the heat exchange fluid, allowing the fluid to absorb heat energy and achieve heat exchange. However, static heat exchange pipelines result in relatively slow flow of the heat exchange fluid inside, leading to better heating of the fluid on the heat-facing side and poorer heating of the fluid on the heat-receiving side, resulting in an uneven and inefficient overall heat exchange effect. The overall approach of this embodiment to solve the above problem is: by using a vibration unit in the exhaust gas conveying pipe... The circuit is equipped with a vibrating motor and a power rod, which guides and transmits the driving force of the vibrating motor to the tower-shaped spiral heat exchange pipe that can extend and contract. This causes the heat exchange pipe to vibrate and sway during heat exchange operations, which in turn causes the water flowing inside to tumble and roll. This allows the water flowing inside the pipe to adhere more fully and evenly to the inner wall of the heat exchange pipe, making the heating area more uniform and effectively improving the overall heat exchange effect. It also creates a turbulence effect on the surrounding high-temperature exhaust gas flow, which not only increases the overall heat exchange contact area between the high-temperature exhaust gas and the heat exchange pipe, but also prolongs the contact time between the high-temperature exhaust gas and the heat exchange pipe, effectively improving the heat recovery effect.

[0045] In some examples, as shown in Figures 1, 3, and 5, multiple heat exchange pipes 2 include a primary heat exchange pipe 201, a secondary heat exchange pipe 202, a tertiary heat exchange pipe 203, and a quaternary heat exchange pipe 204 arranged sequentially from bottom to top. The primary heat exchange pipe 201 and the secondary heat exchange pipe 202 are the pre-heat exchange pipes, while the tertiary heat exchange pipe 203 and the quaternary heat exchange pipe 204 are the post-heat exchange pipes. The heat output end of the tertiary heat exchange pipe 203 surrounds the heat output end of the primary heat exchange pipe 201, and the heat output end of the quaternary heat exchange pipe 204 surrounds the heat output end of the secondary heat exchange pipe 202. The primary heat exchange pipe 201, as the main heat recovery device, first contacts the high-temperature exhaust gas and completes the first heat exchange operation. The secondary heat exchange pipe 202, as a secondary heat recovery device, performs a second heat exchange on the exhaust gas that has already completed one heat exchange operation, extracting the residual heat energy of the exhaust gas again. Then, the tertiary heat exchange pipe 203 and the quaternary heat exchange pipe 204... The first-stage heat exchanger tube 204 can perform third and fourth heat exchanges on the exhaust gas that has already undergone secondary heat exchange, respectively, to extract the residual heat energy of the exhaust gas again. Since the heat energy that can be extracted in the third heat exchange operation of the third-stage heat exchanger tube 203 and the fourth heat exchange operation of the fourth-stage heat exchanger tube 204 is relatively small and cannot meet the needs of subsequent heat energy storage, the heat energy extracted in the third heat exchange operation of the third-stage heat exchanger tube 203 is used as an auxiliary heat source to provide auxiliary heat supply and insulation for the first heat energy recovery effect of the first-stage heat exchanger tube 201, and the heat energy extracted in the fourth heat exchange operation of the fourth-stage heat exchanger tube 204 is used as an auxiliary heat source to provide auxiliary heat supply and insulation for the second heat energy recovery effect of the second-stage heat exchanger tube 202. This ensures that the two heat energy recovery effects of the first-stage heat exchanger tube 201 and the second-stage heat exchanger tube 202 are more efficient and complete, and ensures that the heat energy of the heat energy recovery pipeline is not easily lost after heat exchange, so as to make the overall heat energy recovery effect more ideal.

[0046] Furthermore, the outer perimeter of the primary heat exchanger tube 201 is covered with insulating cotton cloth by the tertiary heat exchanger tube 203, and the outer perimeter of the secondary heat exchanger tube 202 is covered with insulating cotton cloth by the quaternary heat exchanger tube 204. These basic insulation measures, such as the insulating cotton cloth, provide a basic insulation effect for the heat recovery of the primary heat exchanger tube 201 and the secondary heat exchanger tube 202, ensuring that the heat energy is not easily lost after the heat recovery operation.

[0047] In some examples, as shown in Figures 1-3, a five-stage heat exchange tube 205 is also included. The heat output end of the five-stage heat exchange tube 205 surrounds the exhaust gas conveying pipeline 1. By configuring the five-stage heat exchange tube 205, the exhaust gas in the heat exchange chamber 101 can undergo a fifth heat exchange operation after four heat exchange operations. The five-stage heat exchange tube 205 performs a fifth heat energy recovery on the exhaust gas that has already undergone four heat exchange operations, extracting as much residual heat energy as possible, and guiding the extracted heat energy to the air inlet 102 of the exhaust gas conveying pipeline 1, providing auxiliary measures for heating and insulation of the exhaust gas conveying pipeline 1, so as to ensure the heat energy retention effect of the exhaust gas before heat exchange.

[0048] In some examples, as shown in Figure 4, heat exchange extension fins 206 are formed on both the inner and outer side walls of the heat exchange pipeline 2 to increase the heat exchange area. The additional heat exchange extension fins 206 can further improve the contact area of ​​the heat exchange operation and ensure the heat recovery effect of the heat exchange pipeline 2. The gasket 13 abuts against the upper surface of the heat exchange extension fins 206.

[0049] In some examples, the heat exchange extension fin 206 has a wave structure and ventilation holes are opened at the peaks of the waves. When the high-temperature exhaust gas flows through the heat exchange extension fin 206, the high-temperature exhaust gas impacting the valley of the wave can flow into the peak of the wave under the guidance of the wave-shaped extension structure, and pass through the ventilation holes through the heat exchange extension fin 206. Therefore, the contact area between the high-temperature exhaust gas and the heat exchange extension fin 206 can be increased, thereby further increasing the heat exchange efficiency.

[0050] In some examples, as shown in Figures 5-7, a side heat exchange network 3 is arranged between the wall of the heat exchange chamber 101 and the heat exchange pipe 2. The upper end of the side heat exchange network 3 is connected to a water inlet pipe 301, and the lower end is connected to a discharge pipe 302. The side heat exchange network 3 can fill the gap between the heat exchange pipe 2 and the wall of the heat exchange chamber 101, thus enabling more complete heat exchange of waste gas, making heat recovery more comprehensive, and reducing the waste of heat resources.

[0051] As shown in Figures 1 and 5-7, temperature detection units are fixedly installed at both the inlet end 102 and the outlet end 103 of the heat exchange chamber 101 in the exhaust gas conveying pipeline 1. Temperature detection units are also evenly distributed at the heat exchange medium input end and the heat output end of the heat exchange pipeline 2. The temperature detection unit is a temperature sensor 4, which is used to detect the temperature difference between the inlet end 102 and the outlet end 103 of the heat exchange chamber 101, and the temperature difference between the heat exchange medium input end and the heat output end of the heat exchange pipeline 2. The temperature sensor 4 can detect and record the heat exchange temperature difference of the heat energy recovery device. Therefore, the heat energy recovery efficiency and effect of the device can be calculated by comparing the data.

[0052] In some examples, as shown in Figures 1, 2 and 7, a front fan 5 is installed at the air inlet 102 of the heat exchange chamber 101, and a rear fan 6 is installed at the exhaust end 103 of the heat exchange chamber 101. The flow rate of the exhaust gas can be controlled by the front fan 5 and the rear fan 6, thus further controlling the heat exchange efficiency of the heat recovery operation.

[0053] Working principle:

[0054] The hot exhaust gas in the exhaust gas conveying pipeline 1 is discharged from bottom to top. The external heat exchange liquid flows sequentially into the primary heat exchange tube 201, secondary heat exchange tube 202, tertiary heat exchange tube 203, quaternary heat exchange tube 204, and quinary heat exchange tube 205. The tower-shaped spiral heat exchange pipeline 2 serves two purposes: firstly, it prolongs the flow time of the heat exchange liquid within the pipeline, thereby increasing the heat exchange time and effect; secondly, it can vibrate up and down under the drive of the power rod 7 (the tower-shaped spiral heat exchange pipeline 2 must be an expandable and contractible metal corrugated pipe), thus driving the internal flow of... The water churns and rolls, allowing it to adhere more fully and evenly to the inner wall of the heat exchange pipe, thus making the heating area of ​​the heat exchange liquid more uniform. The tower-shaped spiral heat exchange pipe 2, combined with the power rod 7, forms a heat exchange structure that can oscillate up and down, thereby significantly improving the heat absorption effect of the heat exchange liquid on the waste heat of high-temperature exhaust gas. At the same time, it can create a turbulence effect on the surrounding high-temperature exhaust gas flow, which not only increases the overall heat exchange contact area between the high-temperature exhaust gas and the heat exchange pipe 2, but also prolongs the contact time between the high-temperature exhaust gas and the heat exchange pipe 2, effectively improving its heat recovery effect.

[0055] The water that has completed the heat exchange operation will be drained through the other end of heat exchange pipe 2. At this time, the downstream tertiary heat exchange pipe 203 can provide a heat-insulating auxiliary effect for the upstream primary heat exchange pipe 201, and the downstream quaternary heat exchange pipe 204 can provide a heat-insulating auxiliary effect for the upstream secondary heat exchange pipe 202, so as to reduce the heat loss of the water that has completed the heat exchange operation during drainage, and ensure the good heat insulation effect of the internal heat exchange water in the primary heat exchange pipe 201 and the secondary heat exchange pipe 202. This is achieved through the low heat absorption of the downstream heat exchange pipe 2. The appropriate temperature water produced by the high heat exchange absorption rate of the heat exchange pipe 2 provides an active heating and insulation effect for the high temperature water produced by the heat exchange pipe 2, thereby reducing the heat loss rate during the transportation and discharge of the high temperature water that has completed heat exchange. This allows the heat absorbed by the waste heat recovery operation to be retained as much as possible, ensuring the high temperature heat demand of subsequent industries. As a downstream five-stage heat exchange pipe 205, it can provide heating and insulation for the waste gas conveying pipe, thereby reducing the temperature loss rate of the high temperature waste gas during the discharge, and thus increasing the overall waste heat recovery effect.

[0056] The above description, based on the preferred embodiments of the present invention, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas, characterized in that: It includes a waste gas conveying pipeline (1) with a heat exchange chamber (101) inside, and a plurality of tower-shaped spiral heat exchange pipelines (2) arranged vertically inside the heat exchange chamber (101) and a vibration unit for driving the heat exchange pipelines (2) to vibrate and shake the heat exchange medium inside. The heat exchange pipeline (2) adjacent to the air inlet (102) of the heat exchange chamber (101) is the front heat exchange pipeline, and the heat exchange pipeline (2) adjacent to the exhaust (103) of the heat exchange chamber (101) is the rear heat exchange pipeline. The heat output end of the rear heat exchange pipeline surrounds the heat output end of the front heat exchange pipeline. The vibration unit includes a vibration motor (9), a power rod (7) connected to the output end of the vibration motor (9) and passing through the middle of multiple heat exchange pipes (2), and a connection structure connecting the heat exchange pipes (2) and the power rod (7).

2. The heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 1, characterized in that: The connection structure is a rigid connection structure, which is a branch rod (8) connecting the heat exchange pipeline (2) and the power source.

3. The heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 1, characterized in that: The connection structure is a flexible connection structure, which includes a side support rod (11), an elastic telescopic member (12) connected to the lower end face of the side support rod (11), and a gasket (13) connected to the end of the elastic telescopic member (12) away from the side support rod (11).

4. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 3, characterized in that: The expansion and contraction strength of the multiple elastic expansion members (12) gradually decreases from bottom to top.

5. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 1, characterized in that: Multiple heat exchange pipes (2) include a first-stage heat exchange pipe (201), a second-stage heat exchange pipe (202), a third-stage heat exchange pipe (203), and a fourth-stage heat exchange pipe (204) arranged sequentially from bottom to top. The first-stage heat exchange pipe (201) and the second-stage heat exchange pipe (202) are the front heat exchange pipes, and the third-stage heat exchange pipe (203) and the fourth-stage heat exchange pipe (204) are the rear heat exchange pipes. The heat output end of the third-stage heat exchange pipe (203) surrounds the heat output end of the first-stage heat exchange pipe (201), and the heat output end of the fourth-stage heat exchange pipe (204) surrounds the heat output end of the second-stage heat exchange pipe (202).

6. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 5, characterized in that: It also includes a five-stage heat exchange tube (205), the heat output end of which surrounds the exhaust gas conveying pipeline (1).

7. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 1, characterized in that: Heat exchange extension fins (206) are formed on both the inner and outer side walls of the heat exchange pipeline (2).

8. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 7, characterized in that: The heat exchange extension fins (206) have a wave structure, and ventilation holes are opened at the peaks of the waves.

9. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 1, characterized in that: A side heat exchange network (3) is provided between the heat exchange chamber (101) wall and the heat exchange pipeline (2). The upper end of the side heat exchange network (3) is connected to a water inlet pipe (301), and the lower end is connected to a discharge pipe (302).

10. A heat energy recovery device for the cascade reuse of waste heat from biogas internal combustion engine exhaust gas according to claim 1, characterized in that: A front fan (5) is installed at the air inlet (102) of the heat exchange chamber (101), and a rear fan (6) is installed at the exhaust end (103) of the heat exchange chamber (101).

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