Heat energy recovery device for cascade reutilization of waste heat of exhaust gas of biogas internal combustion engine

Abstract

The invention discloses a biogas internal combustion engine exhaust gas waste heat cascade reutilization heat energy recovery device which comprises an exhaust gas conveying pipeline, a heat exchange cavity is formed in the exhaust gas conveying pipeline, a plurality of tower-shaped spiral heat exchange pipelines are arranged in the heat exchange cavity, the multiple heat exchange pipelines are vertically and sequentially distributed, the heat exchange pipelines are corrugated pipelines, and the heat exchange pipelines are communicated with the heat exchange cavity. A power rod is arranged in the middle of the heat exchange pipeline; the vibration motor and the power rod are arranged in the waste gas conveying pipeline, so that the power rod can guide and transmit the driving force of the vibration motor to the tower-shaped spiral heat exchange pipeline capable of extending and contracting through the hard connecting structure or the soft connecting structure, and the heat exchange pipeline can shake up and down in the heat exchange operation period; and therefore, water flowing in the pipeline can be driven to roll up and down, the water flowing in the pipeline can be more sufficiently and uniformly attached to the inner wall of the heat exchange pipeline, the heating area of the pipeline is more uniform, and the overall heat exchange effect is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat energy recovery, and in particular to a heat energy recovery device for cascaded recycling of waste heat from exhaust gas of a biogas internal combustion engine. Background Art

[0002] Biogas is often supplied from a gas tank to an internal combustion engine via a desulfurizer. The internal combustion engine then generates kinetic energy through biogas combustion to drive other external equipment to perform corresponding operations, such as a generator set. However, the exhaust gas generated after the biogas combustion will be discharged by the internal combustion engine. In order to save energy, in existing related technologies, a heat recovery device is usually configured at the exhaust gas discharge end of the biogas internal combustion engine.

[0003] In the related art, the waste heat recovery device of the exhaust gas internal combustion engine usually fixes the heat exchange pipeline in the exhaust gas emission pipeline for heat exchange, so as to recover the waste heat energy in the exhaust gas. In this technical solution, the fixed heat exchange pipeline can provide a smooth flow space for the hot water exchange. Therefore, the end face of the heat exchange pipeline facing the high-temperature exhaust gas will have a good heating effect, while the end face facing away from the high-temperature exhaust gas will have a poor heating effect. This will cause the heating effect of the hot water exchange liquid flowing through the heat exchange pipeline to be uneven, resulting in poor overall heat energy recovery effect.

[0004] In addition, in order to ensure the recovery effect of waste heat, in related technologies, it is usually necessary to wrap insulation structures such as insulation cotton on the pipeline after the heat exchange is completed to reduce temperature loss. Although this operation method can meet the insulation effect of conventional heat energy recovery, conventional insulation measures such as insulation cotton can only provide basic insulation effect for the pipeline after the heat exchange is completed, and cannot provide auxiliary insulation measures for heating and keeping warm for the pipeline after the heat exchange is completed. Therefore, there is still a certain temperature loss in the pipeline after the heat exchange is completed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to overcome the problem that the exhaust heat recovery device of the biogas internal combustion engine in the prior art adopts a fixed heat exchange pipeline, which causes the heating effect of the hot water flowing through the heat exchange pipeline to be uneven, thereby resulting in its overall heat energy recovery effect being poor, a heat energy recovery device for the cascade reuse of the exhaust heat of the biogas internal combustion engine is provided.

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

[0007] The heat exchange pipeline adjacent to the air inlet end of the heat exchange cavity is the front heat exchange pipeline, and the heat exchange pipeline adjacent to the exhaust end of the heat exchange cavity 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 a plurality of heat exchange pipelines, and a connection structure connected between the heat exchange pipelines and the power rod.

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

[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 surface of the side support rod, and a gasket connected to the end of the elastic telescopic member away from the side support rod.

[0011] Furthermore, the telescopic strength of the multiple elastic telescopic members gradually decreases from bottom to top.

[0012] Furthermore, the multiple heat exchange pipes include a first-level heat exchange pipe, a second-level heat exchange pipe, a third-level heat exchange pipe and a fourth-level heat exchange pipe arranged in sequence from bottom to top, wherein the first-level heat exchange pipe and the second-level heat exchange pipe are front heat exchange pipes, the third-level heat exchange pipe and the fourth-level heat exchange pipe are rear heat exchange pipes, the thermal output end of the third-level heat exchange pipe surrounds the thermal output end of the first-level heat exchange pipe, and the thermal output end of the fourth-level heat exchange pipe surrounds the thermal output end of the second-level heat exchange pipe.

[0013] Furthermore, it also includes a five-stage heat exchange tube, and the thermal output end of the five-stage heat exchange tube surrounds the exhaust gas conveying pipeline.

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

[0015] Furthermore, the heat exchange extension fins are in a wave structure, and air holes are provided at the peaks of the waves.

[0016] Furthermore, a side heat exchange network is arranged between the heat exchange cavity wall and the heat exchange pipeline, and the upper end of the side heat exchange network is connected to the water inlet pipe, and the lower end is connected to the 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 air outlet end of the heat exchange chamber.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention configures a vibration motor and a power rod in the exhaust gas conveying pipeline, so that the power rod can guide the driving force of the vibration motor to the tower-shaped spiral heat exchange pipeline that can be extended and contracted through a rigid connection structure or a flexible connection structure, so that the heat exchange pipeline can vibrate and shake up and down during the heat exchange operation, thereby driving the water flowing inside it to tumble and roll up and down, thereby allowing the water flowing in the pipeline to more fully and evenly adhere to the inner wall of the heat exchange pipeline, making its heated area more uniform, effectively improving the overall heat exchange effect, and generating a turbulent effect on the high-temperature exhaust gas flow passing through. This not only increases the overall heat exchange contact area between the high-temperature exhaust gas and the heat exchange pipeline, but also prolongs the contact time between the high-temperature exhaust gas and the heat exchange pipeline, effectively improving its heat energy recovery effect.

[0020] 2. The present invention arranges multiple heat exchange pipelines in the heat exchange cavity, and the multiple vertically distributed heat exchange pipelines perform heat exchange operations on the exhaust gas flowing in the heat exchange cavity in turn. Since the front heat exchange pipeline has a better heat energy recovery effect, the front heat exchange pipeline is used as the primary heat energy recovery equipment, and the heat energy recovery effect of the rear heat exchange pipeline is poor, the heat energy recovered by the rear heat exchange pipeline is used to provide auxiliary insulation measures for heating and keeping warm for the heat energy recovery pipeline of the front heat exchange pipeline, and then conventional insulation measures such as insulation cotton are set on its periphery. Therefore, it can further ensure that the heat energy of the heat energy recovery pipeline after heat exchange is not easily lost, making the overall heat energy recovery effect more ideal. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

[0027] Figure 6This is a schematic diagram of the structural distribution of the side heat exchange network in a heat recovery device for cascaded reuse of waste heat from biogas internal combustion engines according to the present invention;

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

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

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

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

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

[0033] Figure 12 This is a heat energy recovery device for cascade reuse of waste heat from biogas internal combustion engine exhaust gas. Figure 11 A magnified schematic diagram of the structure in the middle.

[0034] In the picture:

[0035] 1. Exhaust gas conveying pipeline; 101. Heat exchange chamber; 102. Air inlet end; 103. Exhaust end; 2. Heat exchange pipeline; 201. First-stage heat exchange tube; 202. Second-stage heat exchange tube; 203. Third-stage heat exchange tube; 204. Fourth-stage heat exchange tube; 205. Fifth-stage heat exchange tube; 206. Heat exchange extension fin; 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 expansion member; 13. Gasket. DETAILED DESCRIPTION

[0036] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. Therefore, they only show components relevant to the present invention, and directions and references such as up, down, left, right, etc., are merely used to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0037] Example 1:

[0038] like Figure 1-Figure 3 As shown, the present invention is a heat energy recovery device for cascade reuse of waste heat from exhaust gas of a biogas internal combustion engine, comprising an exhaust gas delivery pipeline 1 having a heat exchange cavity 101 formed therein, wherein the heat exchange cavity 101 is provided with a plurality of tower-shaped spiral heat exchange pipelines 2 distributed vertically and a vibration unit for driving the heat exchange pipelines 2 to vibrate so as to shake the heat exchange medium therein, wherein the upper end of the tower-shaped spiral heat exchange pipeline 2 is a small end and the lower end is a large end;

[0039] 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 connected between the heat exchange pipes 2 and the power rod 7. The vibration motor 9 is fixedly installed in the center of the exhaust gas conveying pipe 1 through a connection support 10. The power rod 7 extends in the vertical direction, and the connection 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 be extended and contracted. 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 connection structure, so that the tower-shaped spiral heat exchange pipe 2 can vibrate up and down, thereby having a shock effect on the hot water flowing therein, so that the hot water can shake up and down in the pipe and fully contact the pipe wall of the heat exchange pipe. , so that the heat exchange water can complete uniform and sufficient heat exchange operations, effectively improving the overall heat exchange effect; in addition, the tower-shaped spiral heat exchange pipeline 2 will also have an interference effect on the high-temperature exhaust gas flowing around it during the up and down vibration, so that the normal flow of air can produce turbulence, disturbance, turbulence or turbulence under the oscillation of the contraction and extension of the tower-shaped spiral heat exchange pipeline 2. It can not only increase the overall heat exchange contact area between the high-temperature exhaust gas and the heat exchange pipeline 2, but also extend the contact time between the high-temperature exhaust gas and the heat exchange pipeline 2, effectively improving its heat energy recovery effect.

[0040] One end of the heat exchange chamber 101 is an air inlet end 102, and the other end is an exhaust end 103. The heat exchange pipe 2 adjacent to the air inlet end 102 of the heat exchange chamber 101 is a front heat exchange pipe, and the heat exchange pipe 2 adjacent to the exhaust end 103 of the heat exchange chamber 101 is a 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.

[0041] This embodiment provides a post-heat exchange pipeline to perform secondary heat exchange on the exhaust gas after the primary heat exchange has been completed, and uses the heat energy recovered from the secondary heat exchange to provide auxiliary insulation measures for heating and keeping warm for the heat energy of the primary heat exchange, so as to further ensure that the temperature of the pipeline after the heat exchange is not easily lost. The heat energy recovery device for the cascade reuse of the waste heat of the biogas internal combustion engine exhaust gas solves the problem in the prior art that conventional insulation measures such as insulation cotton can only provide basic insulation effect for the pipeline after the heat exchange is completed, and cannot provide auxiliary insulation measures for heating and keeping warm for the pipeline after the heat exchange is completed, thereby resulting in a certain temperature loss phenomenon in the pipeline after the heat exchange is completed. The overall idea of ​​this embodiment to solve the above problem is: By arranging multiple heat exchange pipes 2 in the heat exchange chamber 101, multiple vertically distributed heat exchange pipes 2 perform heat exchange operations on the exhaust gas flowing in the heat exchange chamber 101 in turn. Since the front heat exchange pipe 2 has a better heat energy recovery effect, the front heat exchange pipe 2 is used as the primary heat energy recovery equipment, and the heat energy recovery effect of the rear heat exchange pipe 2 is poor, the heat energy recovered by the rear heat exchange pipe 2 is used to provide auxiliary insulation measures for heating and keeping warm for the heat energy recovery pipe of the front heat exchange pipe 2, and then conventional insulation measures such as insulation cotton are set on its periphery. Therefore, it can further ensure that the heat energy of the heat energy recovery pipe after heat exchange is not easily lost, making the overall heat energy recovery effect more ideal.

[0042] In some examples, such as Figure 8 and Figure 9 As shown, the connection structure is a rigid connection structure, which is a branch rod 8 connected between the heat exchange pipeline 2 and the power, the power rod 7 is vertically arranged, and the branch rod 8 is horizontally arranged.

[0043] In some examples, such as Figure 10-12 As shown, 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 surface of the side support rod 11, and a gasket 13 rotatably connected to the end of the elastic telescopic 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 telescopic member 12 can provide a buffering effect.

[0044] In some examples, the telescopic strength of the plurality of elastic telescopic members 12 gradually decreases from bottom to top. The elastic telescopic members 12 may be spring rods. Due to the different telescopic strengths of the elastic telescopic members 12, the vibration force transmitted by the power rod 7 to the tower-shaped spiral heat exchange pipeline 2 will be different. For example, the telescopic strength of the elastic telescopic members 12 decreases one by one from bottom to top. Since the telescopic strength of the elastic telescopic member 12 at the lower end is large, it will only undergo telescopic deformation when it is subjected to a large force. Therefore, the transmission efficiency of the elastic telescopic member 12 at the lower layer is higher than that of the elastic telescopic member 12 at the upper layer. The telescopic member 12 will make the vibration effect of the first-stage heat exchange tube 201 connected to the lower elastic telescopic member 12 the strongest, while the vibration effect of the fifth-stage heat exchange tube 205 connected to the upper elastic telescopic member 12 is the weakest; the idea of ​​proposing this specific embodiment is that: since the high-temperature exhaust gas enters from the bottom of the exhaust gas conveying pipeline 1 and is discharged from the top, when the high-temperature exhaust gas flows from the bottom to the top through the heat exchange cavity 101, it will vibrate 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 2 05 come into contact one by one, and gradually slow down under the blocking influence of the first-level heat exchange tube 201, the second-level heat exchange tube, the third-level heat exchange tube 203, the fourth-level heat exchange tube 204 and the fifth-level heat exchange tube 205. The first-level heat exchange tube 201 located at the lower layer first comes into contact with the high-temperature exhaust gas, and vibrates and shakes in accordance with the flow rate of the high-temperature exhaust gas under the transmission effect of the power rod 7 and the flexible connection structure, so that the first-level heat exchange tube 201 can more intensely collide with the high-speed high-temperature exhaust gas, thereby efficiently completing the heat exchange operation, and passing through the first-level heat exchange tube The high-temperature exhaust gas that is blocked and slowed down by the tube 201 will contact the secondary heat exchange tube 202, and the secondary heat exchange tube 202 can also vibrate and shake in a manner that is adapted to the flow rate of the high-temperature exhaust gas that is initially slowed down under the transmission effect of the power rod 7 and the flexible connection structure, so that the secondary heat exchange tube 202 can also complete the corresponding efficient heat exchange operation. Similarly, the exhaust gas flow rate when flowing through the fifth-stage heat exchange tube 205 has been reduced, and the vibration and shaking intensity of the fifth-stage heat exchange tube 205 is adapted to the exhaust gas flow rate, so it can also produce a more efficient heat exchange effect.

[0045] The embodiment provides a heat energy recovery device with a vibration unit built-in for driving heat exchange pipelines to produce uniform or non-uniform shaking and swinging effects to increase overall heat energy recovery effects, solves the problem that conventional heat exchange pipelines in the prior art usually adopt static heat exchange pipelines to provide flow paths for heat exchange water liquid, so that the heat exchange water liquid can absorb heat energy to realize heat exchange effects, but the static heat exchange pipelines cause the heat exchange water liquid flowing in the pipelines to be relatively smooth, so that the water liquid on the heat receiving surface of the heat exchange pipeline has a good heating effect, while the water liquid on the heat receiving surface has a poor heating effect, thereby causing the overall heat exchange effect to be not uniform and efficient, and the general idea of solving the above problem is that: a vibration motor and a power rod are arranged in the waste gas conveying pipeline, the power rod can guide and transmit the driving force of the vibration motor to the tower-shaped spiral heat exchange pipeline which can be extended and contracted, the heat exchange pipeline can shake and swing up and down during heat exchange operation, so that the water liquid flowing in the heat exchange pipeline can be driven to roll up and down, and then the water liquid flowing in the pipeline can be more fully and uniformly attached to the inner wall of the heat exchange pipeline, so that the heat receiving area is more uniform, the overall heat exchange effect is effectively improved, and the waste gas flow around the pipeline can be disturbed, the overall heat exchange contact area of the high-temperature waste gas and the heat exchange pipeline can be increased, and the contact time of the high-temperature waste gas and the heat exchange pipeline can be prolonged, so that the heat energy recovery effect is effectively improved.

[0046] In some examples, as Figure 1 , Figure 3 and Figure 5As shown, the plurality of heat exchange pipelines 2 includes a first-stage heat exchange pipeline 201, a second-stage heat exchange pipeline 202, a third-stage heat exchange pipeline 203, and a fourth-stage heat exchange pipeline 204 arranged in sequence from bottom to top, wherein the first-stage heat exchange pipeline 201 and the second-stage heat exchange pipeline 202 are front heat exchange pipelines, and the third-stage heat exchange pipeline 203 and the fourth-stage heat exchange pipeline 204 are rear heat exchange pipelines, the thermal output end of the third-stage heat exchange pipeline 203 surrounds the thermal output end of the first-stage heat exchange pipeline 201, and the thermal output end of the fourth-stage heat exchange pipeline 204 surrounds the thermal output end of the second-stage heat exchange pipeline 202, wherein the first-stage heat exchange pipeline 201 as the main heat energy recovery equipment can first contact the high-temperature exhaust gas and complete the first heat exchange operation of the exhaust gas, and the second-stage heat exchange pipeline 202 as the secondary heat energy recovery equipment can perform secondary heat exchange on the exhaust gas that has completed the first heat exchange operation, thereby extracting the residual heat energy of the exhaust gas again, and then the third-stage heat exchange pipeline 203 and the fourth-stage heat exchange pipeline 204 can perform third and fourth heat exchange on the exhaust gas that has completed the secondary heat exchange, thereby extracting the residual heat energy of the exhaust gas again. Since the third heat exchange operation of the third-stage heat exchange pipeline 203 and the fourth heat exchange operation of the fourth-stage heat exchange pipeline 204 can extract less heat energy, they cannot meet the demand of subsequent heat energy storage, so the heat energy extracted by the third heat exchange operation of the third-stage heat exchange pipeline 203 is used as an auxiliary heat source to provide auxiliary heat preservation for the first heat energy recovery effect of the first-stage heat exchange pipeline 201, and the heat energy extracted by the fourth heat exchange operation of the fourth-stage heat exchange pipeline 204 is used as an auxiliary heat source to provide auxiliary heat preservation for the second heat energy recovery effect of the second-stage heat exchange pipeline 202, thereby ensuring that the two heat energy recovery effects of the first-stage heat exchange pipeline 201 and the second-stage heat exchange pipeline 202 are more efficient and perfect, and the heat energy of the heat exchange pipeline is not easily lost, so that the overall heat energy recovery effect is more ideal.

[0047] In addition, the periphery of the third-stage heat exchange pipeline 203 around the first-stage heat exchange pipeline 201 is also covered with thermal insulation cotton, and the periphery of the fourth-stage heat exchange pipeline 204 around the second-stage heat exchange pipeline 202 is also covered with thermal insulation cotton; the basic heat preservation measures such as thermal insulation cotton can provide basic heat preservation for the heat energy recovery effect of the first-stage heat exchange pipeline 201 and the second-stage heat exchange pipeline 202, thereby ensuring that the heat energy after the heat recovery operation is not easily lost.

[0048] In some examples, as shown in Figure 1-Figure 3 The fifth-stage heat exchange pipeline 205 surrounds the exhaust gas conveying pipeline 1, and the fifth-stage heat exchange pipeline 205 can perform fifth heat exchange on the exhaust gas that has completed the four heat exchange operations, thereby extracting the residual heat energy as much as possible and guiding the extracted heat energy to the air inlet end 102 of the exhaust gas conveying pipeline 1 to provide auxiliary heat preservation for the exhaust gas conveying pipeline 1, so as to ensure the heat energy preservation effect of the exhaust gas before heat exchange.

[0049] In some examples, such as Figure 4 As shown, 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 additionally configured heat exchange extension fins 206 can further increase the contact area of ​​the heat exchange operation and ensure the heat energy recovery effect of the heat exchange pipeline 2. The gasket 13 abuts against the upper end surface of the heat exchange extension fin 206.

[0050] In some examples, the heat exchange extension fins 206 have a wavy structure, and air holes are opened on the peak corners of the waves. When the high-temperature exhaust gas flows through the heat exchange extension fins 206, the high-temperature exhaust gas impacting the wave valley corners can flow into the wave peak corners under the guidance of the wavy extension structure, and pass through the heat exchange extension fins 206 through the air holes. Therefore, the contact area between the high-temperature exhaust gas and the heat exchange extension fins 206 can be increased, thereby further increasing the heat exchange efficiency.

[0051] In some examples, such as Figure 5-Figure 7 As shown, a side heat exchange network 3 is arranged between the wall of the heat exchange chamber 101 and the heat exchange pipeline 2. The upper end of the side heat exchange network 3 is connected to the water inlet pipe 301, and the lower end is connected to the discharge pipe 302. The side heat exchange network 3 can fill the gap between the heat exchange pipeline 2 and the wall of the heat exchange chamber 101, so that the exhaust gas can be more perfectly heat exchanged, the heat energy recovery operation is more comprehensive, and the waste of thermal resources is reduced.

[0052] like Figure 1 and Figure 5-Figure 7 As shown, the exhaust gas conveying pipeline 1 is fixedly installed with temperature detection units at the air inlet end 102 and the exhaust end 103 of the heat exchange chamber 101, and the heat exchange medium input end and the thermal output end of the heat exchange pipeline 2 are also provided with temperature detection units; the temperature detection unit is a temperature sensor 4, which is used to detect the temperature difference between the air inlet end 102 and the exhaust end 103 of the heat exchange chamber 101, and the temperature difference between the heat exchange medium input end and the thermal output end of the heat exchange pipeline 2. The heat exchange temperature difference of the heat energy recovery device can be detected and recorded through the temperature sensor 4, so the heat energy recovery efficiency and effect of the device can be calculated by data comparison.

[0053] In some examples, such as Figure 1 、 Figure 2 and Figure 7 As shown, the air inlet end 102 of the heat exchange chamber 101 is installed with a front fan 5, and the exhaust end 103 of the heat exchange chamber 101 is installed with a rear fan 6. The flow rate of the exhaust gas can be controlled by the front fan 5 and the rear fan 6, thereby further controlling the heat exchange efficiency of the heat energy recovery operation.

[0054] Working principle:

[0055] The hot exhaust gas in the exhaust gas conveying pipeline 1 is discharged from bottom to top, and the water used for heat exchange outside flows into 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 in sequence. The tower-shaped spiral heat exchange pipeline 2 is used to prolong the flow time of the heat exchange water in the heat exchange pipeline 2 on the one hand, so as to increase the heat exchange time and heat exchange effect. On the other hand, it can vibrate up and down under the drive of the power rod 7 (the tower-shaped spiral heat exchange pipeline 2 here needs to adopt a metal corrugated pipeline that can be extended and contracted), so as to drive the water flowing through it. The water liquid tumbles and rolls up and down, so that the water liquid flowing through it can more fully and evenly adhere to the inner wall of the heat exchange pipe, thereby making the heating area of ​​the water liquid more uniform. The tower-shaped spiral heat exchange pipe 2 and the power rod 7 can form a heat exchange structure that can oscillate up and down, thereby greatly improving the heat absorption effect of the water liquid on the high-temperature exhaust gas. At the same time, it can produce a turbulent effect on the high-temperature exhaust gas flow passing through the surrounding area, 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 energy recovery effect.

[0056] The water that has completed the heat exchange operation will be drained out through the other end of the heat exchange pipe 2. At this time, the rear-placed third-stage heat exchange pipe 203 can provide a heat insulation auxiliary effect for the front-placed first-stage heat exchange pipe 201, and the rear-placed fourth-stage heat exchange pipe 204 can provide a heat insulation auxiliary effect for the front-placed second-stage heat exchange pipe 202, so as to reduce the heat loss of the water that has completed the heat exchange operation when it is drained out, ensure the good heat preservation effect of the water in the first-stage heat exchange pipe 201 and the second-stage heat exchange pipe 202, and through the low heat exchange absorption of the rear-place heat exchange pipe 2 The suitable temperature water liquid generated by the high heat exchange rate provides an active heating and insulation effect for the high temperature water liquid generated by the high heat exchange absorption rate of the front heat exchange pipeline 2, so as to reduce the heat loss rate during the transportation, drainage and discharge of the high temperature water liquid that has completed the heat exchange in the heat exchange pipeline 2, so that the heat absorbed by the waste heat recovery operation can be retained as much as possible to ensure the high temperature heat demand of subsequent industries. The rear-placed five-stage heat exchange pipe 205 can provide a heating and insulation effect for the exhaust gas conveying pipe to reduce the temperature loss rate of the high temperature exhaust gas during the discharge period, thereby increasing the overall waste heat recovery effect.

[0057] The above description of the preferred embodiments of the present invention is intended to serve as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A heat recovery device for cascade reuse of waste heat from biogas internal combustion engines, characterized by: The invention comprises an exhaust gas conveying pipeline (1) having a heat exchange cavity (101) formed therein, wherein a plurality of tower-shaped spiral heat exchange pipelines (2) distributed vertically are arranged in the heat exchange cavity (101), and a vibration unit for driving the heat exchange pipelines (2) to vibrate so as to shake the heat exchange medium therein; The heat exchange pipeline (2) adjacent to the air inlet end (102) of the heat exchange chamber (101) is a front heat exchange pipeline, and the heat exchange pipeline (2) adjacent to the exhaust end (103) of the heat exchange chamber (101) is a 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 comprises a vibration motor (9), a power rod (7) connected to the output end of the vibration motor (9) and passing through the middle of a plurality of heat exchange pipelines (2), and a connection structure connected between the heat exchange pipelines (2) and the power rod (7).

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

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

4. The heat recovery device for cascaded reuse of waste heat from biogas internal combustion engines according to claim 3 is characterized by: The telescopic strength of the plurality of elastic telescopic members (12) gradually decreases from bottom to top.

5. The heat energy recovery device for cascade reuse of waste heat from biogas internal combustion engines according to claim 1, characterized in that: The plurality of 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 in sequence from bottom to top, wherein the first-stage heat exchange pipe (201) and the second-stage heat exchange pipe (202) are front heat exchange pipes, the third-stage heat exchange pipe (203) and the fourth-stage heat exchange pipe (204) are 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. The heat energy recovery device for cascaded reuse of waste heat from biogas internal combustion engines according to claim 5, characterized in that: It also includes a five-stage heat exchange pipe (205), wherein the heat output end of the five-stage heat exchange pipe (205) surrounds the exhaust gas conveying pipeline (1).

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

8. The heat recovery device for cascade reuse of waste heat from biogas internal combustion engines according to claim 7, characterized in that: The heat exchange extension fins (206) are in a wave structure, and air holes are provided at the peaks of the waves.

9. The heat recovery device for cascade reuse of waste heat from biogas internal combustion engines according to claim 1, characterized in that: A side heat exchange network (3) is arranged between the wall of the heat exchange cavity (101) 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. The heat recovery device for cascaded reuse of waste heat from biogas internal combustion engines according to claim 1, characterized in that: The air inlet end (102) of the heat exchange chamber (101) is equipped with a front fan (5), and the air outlet end (103) of the heat exchange chamber (101) is equipped with a rear fan (6).

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