Tubular heat exchanger and waste heat recovery system

Abstract

The invention provides a tubular heat exchanger and a waste heat recovery system and relates to the technical field of heat exchangers, the tubular heat exchanger comprises an incinerator, the waste heat recovery system comprises the incinerator, two heat exchangers are arranged on one side of the incinerator side by side, a preheating box is arranged at the other ends of the heat exchangers, and the top of the preheating box is connected with the heat exchangers; the top, the bottom and the two ends of each heat exchanger are each provided with a switching assembly, each switching assembly comprises a first communicating pipe and a second communicating pipe, the first communicating pipes are arranged at the top and the bottom of each heat exchanger, and compared with the prior art, the two heat exchangers are alternately used, so that the heat exchange time is prolonged, and heat exchange is more sufficient; the heat exchanger directly sends out a primary heat source, discharged hot air is subjected to secondary heat exchange through the preheating box, gas subjected to two times of exchange is mixed together through the driving assembly and sent into the incinerator, the temperature in the incinerator is maintained, energy loss is reduced, the heat exchange efficiency is improved, and heat exchange is more sufficient.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a shell-and-tube heat exchanger and a waste heat recovery system. Background Art

[0002] The shell and tube heat exchanger is the most widely used heat exchanger in chemical and alcohol production. It is mainly composed of shell, tube sheet, heat exchange tube, head, baffle, etc. The required materials can be made of ordinary carbon steel, copper or stainless steel. During heat exchange, one fluid enters from the connecting pipe of the head, flows in the tube, and flows out from the outlet pipe at the other end of the head. This is called the tube side; the other fluid enters from the connecting pipe of the shell and flows out from another connecting pipe on the shell. This is called the shell side.

[0003] Heat exchangers are mainly used for heat exchange and recovery of generated heat. They can also be used in other aspects. For example, the hot steam generated by an incinerator is sent to the heat exchanger. After contacting with the newly introduced cold air or water, it can be used for residents' daily life. However, in common heat exchanger structures, due to the fast flow rate of the fluid, part of the heat source is sent out before being completely exchanged, which results in a lot of heat being wasted and cannot be well recycled. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a shell-and-tube heat exchanger and a waste heat recovery system to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure. The two groups of heat exchangers are used alternately to increase the heat exchange time, making the heat exchange more sufficient. The heat exchanger directly sends out a primary heat source, and the exhausted hot air is subjected to a secondary heat exchange through a preheating box. The gases exchanged twice are mixed together through a driving component and sent into the incinerator to maintain the temperature in the incinerator, reduce energy loss, and improve the efficiency of heat exchange to make it more sufficient.

[0005] In order to achieve the above-mentioned object, the present invention is implemented through the following technical scheme: a waste heat recovery system, including an incinerator, the waste heat recovery system including an incinerator, two heat exchangers are arranged side by side on one side of the incinerator, and a preheating box is arranged at the other end of the heat exchanger, the top of the preheating box is connected to the heat exchanger, the top, bottom and both ends of the heat exchanger are provided with a switching component, the switching component includes a first connecting pipe and a second connecting pipe, the first connecting pipe is arranged at the top and bottom of the heat exchanger, and a pipe mouth is arranged in the middle position of the first connecting pipe, the heat exchanger The first connecting pipe at the lower end is fixedly connected to a pre-storage box, a delivery pipe is provided at one end of the pre-storage box, and a delivery pipe is fixed at the other end of the pre-storage box, a driving assembly is installed at the other end of the delivery pipe, and the driving assembly includes a mixing tube, an air supply pipe is fixed at one end of the mixing tube, and the air supply pipe is connected to the combustion chamber of the incinerator, a long tube is fixed at the top of the preheating box, and the other end of the long tube is fixedly connected to the mixing tube, piston rods are slidably inserted inside the first connecting tube and the second connecting tube, and connecting assemblies are provided on the outsides of the first connecting tube and the second connecting tube.

[0006] Furthermore, a hollow tube is rotatably installed inside the preheating box through a bearing, the top of the hollow tube is rotatably connected to the pipe mouth of the second connecting tube at the outlet end of the heat exchanger, a plurality of annular tubes are equidistantly fixed on the surface of the hollow tube, and the interior of the annular tubes is connected to the hollow tube, and an air intake pipe is opened on one side of the bottom of the preheating box.

[0007] Furthermore, the driving assembly also includes a transmission belt, and the top of the preheating box is rotatably installed with a transmission belt through a mounting plate, a pulley on one side of the transmission belt is fixedly sleeved on the top of the hollow tube, and a first bevel gear is fixed to the bottom of the pulley at the other end of the transmission belt, and a second bevel gear is meshedly connected to one side of the bottom of the first bevel gear.

[0008] Furthermore, a gear ring frame is rotatably installed on the surface of the mixing tube through an axle ring, a stirring frame is fixed on the gear ring frame at the inner axis of the mixing tube, a transmission rod is fixed on the rear end of the gear ring frame, and the transmission rod rotates out of the mixing tube and is fixedly connected to the second bevel gear.

[0009] Furthermore, a motor is fixed to the bottom of the mixing tube located outside the gear ring frame, and a driving gear is fixed to the output end of the motor, and the driving gear is meshingly connected with the gear ring frame.

[0010] Furthermore, the connecting assembly includes an insert rod, which is fixed on the same side of the piston column inside the first connecting tube and the second connecting tube, and the insert rod slides out of the first connecting tube and the second connecting tube, and the two insert rods at the inlet end and the top of the heat exchanger and the two insert rods at the outlet end and the bottom of the heat exchanger are respectively fixed with connecting plates.

[0011] Furthermore, ring ropes are fixed at both ends of the piston column of the first connecting pipe at the upper end of the heat exchanger, and both ends of the ring rope pass through the first connecting pipe. Guide blocks are fixed at both ends of the first connecting pipe corresponding to the positions where the ring rope passes through, and the ring rope slides through the guide blocks.

[0012] Furthermore, a connecting frame is fixed to the outside of the ring rope, and the bottom of the other end of the connecting frame is fixedly connected to the connecting plate connecting the outlet end and the bottom of the heat exchanger. An electric push rod is fixed on the outer wall of the first connecting pipe at the lower end of the heat exchanger, and the extended end of the electric push rod is fixedly connected to the connecting plate.

[0013] Furthermore, a connecting pipe is passed through the top of the preheating box, the other end of the connecting pipe is fixedly connected to the exhaust gas treatment box, and the connecting pipe is rotatably connected to the bottom of the hollow tube through a bearing.

[0014] A shell-and-tube heat exchanger, wherein a plurality of heat exchange tubes are equidistantly arranged inside the heat exchanger, cross tubes are fixed at both ends of the heat exchanger, and the cross tubes are fixed on the surface of a second connecting tube, the heat exchange tubes are fixedly connected to the cross tubes, vertical tubes are fixed at the top and bottom of the heat exchanger, and the vertical tubes are fixedly connected to the surface of a first connecting tube, a plurality of partitions are equidistantly fixed inside the heat exchanger, and the heat exchange tubes slide through the partitions, and adjacent partitions are staggered up and down.

[0015] Beneficial effects of the present invention: When the electric push rod drives the connecting plate at the lower end to move outward, the connecting plate pulls the first connecting pipe at the outlet end of the heat exchanger and the plug rod inside the second connecting pipe at the lower end to move, driving the piston column to move, closing the outlet end of one side of the heat exchanger, and suspending the delivery of high-temperature exhaust gas and air. At this time, the top vertical pipe and the horizontal pipe at the inlet end of the heat exchanger are opened, and air and high-temperature gas can be delivered to the inside, and the first connecting pipe ring-shaped around the upper end of the heat exchanger is driven to rotate through the connecting frame, driving the internal piston column to move. Because the piston column of the first connecting pipe at the upper end of the heat exchanger and the second connecting pipe at the inlet end are fixedly connected by the plug rod and the connecting plate, the movement direction is opposite to that of the piston column at the lower end. The opening states of the two groups of heat exchangers are opposite, one group of outlet ends are closed, giving air and high-temperature exhaust gas time to contact and exchange heat, and the other group of inlet ends are closed, and the exhaust gas and air whose exchange has been completed are delivered. The two do not affect each other, which can shorten the waiting time for heat exchange of a single heat exchanger and improve the overall heat exchange efficiency.

[0016] The present invention drives a driving gear to rotate through a motor and engages with a gear ring frame to drive a stirring frame to rotate. One side of the mixing tube receives primary heat exchange air sent from a pre-storage box, and the tail end receives secondary heat exchange air sent from a preheating box. After the twice exchanged air is evenly mixed by the stirring frame, it is sent into the combustion chamber of the incinerator. The air has a certain temperature and can reduce energy consumption.

[0017] The present invention drives the transmission rod to rotate through the driving gear, the first bevel gear is meshed with the second bevel gear, and then the hollow tube and the annular tube rotate through the transmission of the transmission belt. The exhaust gas sent out from the heat exchanger still has a certain temperature, and the air is sucked in through the intake pipe and the secondary heat exchange is carried out with the exhaust gas inside the annular tube and the hollow tube. The rotation of the hollow tube and the annular tube drives the air flow, so that the heat exchange is more uniform and efficient. Finally, the exhaust gas is sent to the exhaust gas treatment box for final treatment.

[0018] Compared with the prior art, the present invention uses two groups of heat exchangers alternately to increase the heat exchange time, making the heat exchange more sufficient. The heat exchanger directly sends out a primary heat source, and the exhausted hot air is subjected to a secondary heat exchange through a preheating box. The gases exchanged twice are mixed together through a driving component and sent into the incinerator to maintain the temperature in the incinerator, reduce energy loss, and improve the efficiency of heat exchange to make it more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a system flow of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 2 It is a schematic diagram of the overall structure of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 3 A schematic diagram of the connection of various units of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 4 A schematic diagram of the internal structure of a heat exchanger and a preheating box of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 5 A schematic diagram of the connection between the first bevel gear and the second bevel gear of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 6 A schematic diagram of the internal structure of a mixing box of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 7 It is a schematic diagram of the structure of a drive component of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention; Figure 8 It is a schematic diagram of the internal structure of a first connecting pipe and a second connecting pipe of a shell-and-tube heat exchanger and a waste heat recovery system of the present invention.

[0020] In the figure: 1. incinerator; 2. heat exchanger; 21. heat exchange tube; 22. partition; 23. vertical tube; 24. horizontal tube; 3. preheating box; 31. air inlet pipe; 32. hollow tube; 33. annular tube; 4. exhaust gas treatment box; 41. connecting pipe; 5. switching assembly; 51. first connecting pipe; 52. second connecting pipe; 53. piston column; 54. plug rod; 55. connecting plate; 56. ring rope; 57. guide block; 58. connecting frame; 59. electric push rod; 6. connecting assembly; 7. driving assembly; 71. air supply pipe; 72. transmission belt; 73. first bevel gear; 74. second bevel gear; 75. transmission rod; 76. mixing pipe; 77. gear ring frame; 78. stirring frame; 79. motor; 710. driving gear; 711. long tube; 8. pre-storage box; 81. delivery pipe; 82. delivery pipe. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] See also Figures 1 to 8The present invention provides a technical solution: a waste heat recovery system, comprising an incinerator 1, wherein two heat exchangers 2 are arranged side by side on one side of the incinerator 1, and a preheating box 3 is arranged at the other end of the heat exchanger 2, the top of the preheating box 3 is connected to the heat exchanger 2, and the top, bottom and both ends of the heat exchanger 2 are provided with a switching component 5, the switching component 5 includes a first connecting pipe 51 and a second connecting pipe 52, the first connecting pipe 51 is arranged at the top and bottom of the heat exchanger 2, and a pipe mouth is arranged at the middle position of the first connecting pipe 51, the pipe mouth of the first connecting pipe 51 at the lower end of the heat exchanger 2 is fixedly connected to a pre-storage box 8, one end of the pre-storage box 8 is provided with a delivery pipe 81, and the other end of the pre-storage box 8 is fixed with a delivery pipe 82, and the other end of the delivery pipe 82 is installed with a driving component 7, and the driving component 7 includes a mixing pipe 76, and one end of the mixing pipe 76 is fixed with an air supply pipe Tube 71, and the air supply pipe 71 is connected with the combustion chamber of the incinerator 1, a long tube 711 is fixed on the top of the preheating box 3, and the other end of the long tube 711 is fixedly connected with the mixing tube 76, the interiors of the first connecting tube 51 and the second connecting tube 52 are slidably plugged with piston rods 53, and the outer sides of the first connecting tube 51 and the second connecting tube 52 are provided with a connecting component 6. When the device is used, the high-temperature exhaust gas generated by the incineration of the incinerator 1 is alternately sent into the two heat exchangers 2 through the switching component 5 at the inlet end, and the air is introduced into the heat exchanger 2 through the vertical pipe 23 of the heat exchanger 2. The heat exchanged air is sent to the pre-storage box 8, and the exhaust gas is sent to the preheating box 3 for secondary heat exchange with the new air. The air exchanged twice is mixed in the mixing tube 76 and then sent to the incinerator 1 to maintain the temperature in the incineration room and reduce energy consumption. In this device, the gas flow in all pipelines is driven by a fan.

[0023] In this embodiment, a hollow tube 32 is rotatably mounted inside the preheating box 3 through a bearing, and the top of the hollow tube 32 is rotatably connected to the pipe opening of the second connecting pipe 52 at the outlet end of the heat exchanger 2. A plurality of annular tubes 33 are equidistantly fixed on the surface of the hollow tube 32, and the inside of the annular tube 33 is connected to the hollow tube 32. An air inlet pipe 31 is opened on one side of the bottom of the preheating box 3, and a connecting pipe 41 is passed through the top of the preheating box 3. The other end of the connecting pipe 41 is fixedly connected to the exhaust gas treatment box 4, and the connecting pipe 41 is connected to the bottom of the hollow tube 32 through The bearing is connected in rotation, and the driving gear 710 drives the transmission rod 75 to rotate. The first bevel gear 73 is meshed with the second bevel gear 74 and then driven by the transmission belt 72. The hollow tube 32 and the annular tube 33 rotate. The exhaust gas sent out from the heat exchanger 2 still has a certain temperature. The air is inhaled through the air intake pipe 31 and undergoes secondary heat exchange with the exhaust gas inside the annular tube 33 and the hollow tube 32. The rotation of the hollow tube 32 and the annular tube 33 drives the air flow, making the heat exchange more uniform and efficient. Finally, the exhaust gas is sent to the exhaust gas treatment box 4 for final treatment.

[0024] In this embodiment, the driving assembly 7 also includes a transmission belt 72, and the top of the preheating box 3 is rotatably mounted with the transmission belt 72 through a mounting plate, and a pulley on one side of the transmission belt 72 is fixedly sleeved on the top of the hollow tube 32, and a first bevel gear 73 is fixed to the bottom of the pulley at the other end of the transmission belt 72, and a second bevel gear 74 is meshed and connected to one side of the bottom of the first bevel gear 73, and a gear ring frame 77 is rotatably mounted on the surface of the mixing tube 76 through a shaft ring, and a stirring frame 78 is fixed to the gear ring frame 77 at the inner axis of the mixing tube 76, and a transmission rod 75 is fixed to the rear end of the gear ring frame 77, and the transmission rod 75 rotates to pass through the mixing tube 7 6 is fixedly connected to the second bevel gear 74, the mixing tube 76 is located at the bottom of the outer side of the gear ring frame 77 and is fixed with a motor 79, and the output end of the motor 79 is fixed with a driving gear 710, the driving gear 710 is meshed with the gear ring frame 77, the motor 79 drives the driving gear 710 to rotate and meshes with the gear ring frame 77 to drive the stirring frame 78 to rotate, one side of the mixing tube 76 receives the primary heat exchange air sent from the pre-storage box 8, and the tail end receives the secondary heat exchange air sent from the preheating box 3, the twice exchanged air is evenly mixed through the stirring frame 78 and finally sent to the combustion chamber of the incinerator 1, the air has a certain temperature and can reduce energy consumption.

[0025] In this embodiment, the connecting assembly 6 includes a plug rod 54, and the plug rod 54 is fixed on the same side of the piston column 53 inside the first connecting tube 51 and the second connecting tube 52, and the plug rod 54 slides through the first connecting tube 51 and the second connecting tube 52, and the two plug rods 54 at the inlet end and the top of the heat exchanger 2 and the two plug rods 54 at the outlet end and the bottom of the heat exchanger 2 are respectively fixed with connecting plates 55, and the piston column 53 of the first connecting tube 51 at the upper end of the heat exchanger 2 is fixed with a ring rope 56 at both ends, and the two ends of the ring rope 56 are passed through The first connecting pipe 51 is provided with a guide block 57 fixed at both ends of the first connecting pipe 51 corresponding to the position where the ring rope 56 passes through, and the ring rope 56 slides through the guide block 57. A connecting frame 58 is fixed on the outside of the ring rope 56. The bottom of the other end of the connecting frame 58 is fixedly connected to the connecting plate 55 connected to the outlet end and the bottom of the heat exchanger 2. An electric push rod 59 is fixed on the outer wall of the first connecting pipe 51 at the lower end of the heat exchanger 2, and the extended end of the electric push rod 59 is fixedly connected to the connecting plate 55. The electric push rod 59 drives the lower end of the heat exchanger 2 to move. When the connecting plate 55 at the end moves outward, the connecting plate 55 pulls the first connecting pipe 51 at the outlet end of the heat exchanger 2 and the plug rod 54 inside the second connecting pipe 52 at the lower end to move, driving the piston column 53 to move, closing the outlet end of the heat exchanger 2 on one side, and suspending the delivery of high-temperature exhaust gas and air. At this time, the top vertical pipe 23 and the inlet horizontal pipe 24 of the heat exchanger 2 are opened, and air and high-temperature gas can be delivered to the inside. The first connecting pipe 51 around the upper end of the heat exchanger 2 is driven to rotate through the connecting frame 58, driving the internal piston column 53 to move. Because the piston column 53 of the first connecting pipe 51 at the upper end of the heat exchanger 2 and the second connecting pipe 52 at the inlet end are fixedly connected by the plug rod 54 and the connecting plate 55, the movement direction will be opposite to the piston column 53 at the lower end. The opening states of the two groups of heat exchangers 2 are opposite. The outlet end of one group is closed to give the air and high-temperature exhaust gas time to contact and exchange heat, and the inlet end of the other group is closed to send out the exhaust gas and air after the exchange. The two do not affect each other, which can shorten the waiting time for heat exchange of a single heat exchanger 2 and improve the overall heat exchange efficiency.

[0026] A shell-and-tube heat exchanger, wherein a plurality of heat exchange tubes 21 are arranged equidistantly inside the heat exchanger 2, transverse tubes 24 are fixed at both ends of the heat exchanger 2, and the transverse tubes 24 are fixed on the surface of the second connecting tube 52, the heat exchange tubes 21 are fixedly connected to the transverse tubes 24, the top and bottom of the heat exchanger 2 are fixedly connected to the surface of the first connecting tube 51, a plurality of partitions 22 are fixed equidistantly inside the heat exchanger 2, and the heat exchange tubes 21 slide through the partitions 22, and the adjacent partitions 22 are staggered up and down. The use principle of the heat exchanger 2 is the same as that of the prior art, the high-temperature exhaust gas sent from the inlet end of the heat exchanger 2 by the incinerator 1 is transported through the heat exchange tubes 21, and air is sent into the heat exchanger 2 through the vertical tubes 23 at the top of the heat exchanger 2, the air exchanges heat with the high-temperature exhaust gas, and finally the exhaust gas is discharged from the heat exchanger 2 is sent out through the horizontal pipe 24 at the outlet end, and the air after heat exchange is sent into the pre-storage box 8 from the bottom vertical pipe 23. A part of the pre-storage box 8 can be directly used for residential life or industrial use, and the other part is sent into the mixing pipe 76 through the delivery pipe 82, and after mixing with the air of the secondary heat exchange, it is sent into the incinerator 1 together to maintain the temperature inside the incinerator 1. In this scheme, two groups of heat exchangers 2 are provided, and the structures of the two groups of heat exchangers 2 are the same. Parts of the horizontal pipe 24 and the vertical pipe 23 are fixedly connected to the first connecting pipe 51 and the second connecting pipe 52 respectively. Through the movement of the piston column 53, one group can be opened and the other group can be closed. The opened group is used for the delivery or delivery of high-temperature exhaust gas and air, and the closed group gives the high-temperature exhaust gas and air time for heat exchange, so that the air contacts the heat exchange pipe 21 more thoroughly.

[0027] When the device is used, the high-temperature exhaust gas sent from the inlet end of the heat exchanger 2 of the incinerator 1 is transported through the heat exchange pipe 21, and air is sent into the heat exchanger 2 through the vertical pipe 23 at the top of the heat exchanger 2. The air exchanges heat with the high-temperature exhaust gas. Finally, the exhaust gas is sent out from the horizontal pipe 24 at the outlet end of the heat exchanger 2, and the air after heat exchange is sent into the pre-storage box 8 from the bottom vertical pipe 23. A part of the pre-storage box 8 can be directly used for residential life or industrial use, and the other part is sent into the mixing pipe 76 through the delivery pipe 82. After mixing with the air of the secondary heat exchange, it is sent into the incinerator 1 together to maintain the temperature inside the incinerator 1. In this scheme, two groups of heat exchangers 2 are provided, and the structures of the two groups of heat exchangers 2 are the same. Parts of the horizontal pipe 24 and the vertical pipe 23 are respectively connected to the first connecting pipe 51 and the first connecting pipe 52. The two connecting pipes 52 are fixedly connected, and through the movement of the piston column 53, one group can be opened and the other group can be closed. The opened group is used for the delivery or discharge of high-temperature exhaust gas and air, and the closed group gives the high-temperature exhaust gas and air time for heat exchange, so that the air and the heat exchange tube 21 are in contact more thoroughly. When the electric push rod 59 drives the connecting plate 55 at the lower end to move outward, the connecting plate 55 pulls the first connecting pipe 51 at the outlet end of the heat exchanger 2 and the plug 54 inside the second connecting pipe 52 at the lower end to move, driving the piston column 53 to move, closing the outlet end of the heat exchanger 2 on one side, and suspending the delivery of high-temperature exhaust gas and air. At this time, the top vertical pipe 23 and the inlet horizontal pipe 24 of the heat exchanger 2 are opened, and air and high-temperature gas can be delivered to the inside, and the ring-shaped heat exchanger is driven by the connecting frame 58. 2, the first connecting pipe 51 at the upper end rotates, driving the internal piston column 53 to move. Because the piston column 53 of the first connecting pipe 51 at the upper end of the heat exchanger 2 and the second connecting pipe 52 at the inlet end are fixedly connected by the plug rod 54 and the connecting plate 55, the movement direction is opposite to that of the piston column 53 at the lower end. The opening states of the two groups of heat exchangers 2 are opposite. The outlet end of one group is closed to give air and high-temperature exhaust gas time to contact and exchange heat. The inlet end of the other group is closed to send out the exhaust gas and air that have been exchanged. The two do not affect each other, which can shorten the waiting time for heat exchange of a single heat exchanger 2 and improve the overall heat exchange efficiency. The motor 79 drives the driving gear 710 to rotate and mesh with the gear ring frame 77 to drive the stirring frame 78 to rotate. One side of the mixing pipe 76 receives the primary heat exchange air sent from the pre-storage box 8. The tail end receives the secondary heat exchange air sent from the preheating box 3, mixes the twice exchanged air evenly through the stirring frame 78 and finally sends it into the combustion chamber of the incinerator 1. The air has a certain temperature to reduce energy consumption. The driving gear 710 drives the transmission rod 75 to rotate, and the first bevel gear 73 is meshed with the second bevel gear 74 and then driven by the transmission belt 72. The hollow tube 32 and the annular tube 33 rotate. The exhaust gas sent out from the heat exchanger 2 still has a certain temperature. The air is inhaled through the air inlet pipe 31 and performs secondary heat exchange with the exhaust gas inside the annular tube 33 and the hollow tube 32. The rotation of the hollow tube 32 and the annular tube 33 drives the air flow, making the heat exchange more uniform and efficient. Finally, the exhaust gas is sent to the exhaust gas treatment box 4 for final treatment.

[0028] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A waste heat recovery system, comprising an incinerator (1), characterized in that: The waste heat recovery system comprises an incinerator (1), two heat exchangers (2) are arranged side by side on one side of the incinerator (1), and a preheating box (3) is arranged at the other end of the heat exchanger (2), the top of the preheating box (3) is connected to the heat exchanger (2), the top, bottom and both ends of the heat exchanger (2) are provided with a switching assembly (5), the switching assembly (5) comprises a first connecting pipe (51) and a second connecting pipe (52), the first connecting pipe (51) is arranged at the top and bottom of the heat exchanger (2), and a pipe opening is arranged in the middle position of the first connecting pipe (51), the pipe opening of the first connecting pipe (51) at the lower end of the heat exchanger (2) is fixedly connected to a pre-storage box (8), and one end of the pre-storage box (8) is provided A delivery pipe (81) is provided, and a delivery pipe (82) is fixed to the other end of the pre-storage box (8), a drive assembly (7) is installed to the other end of the delivery pipe (82), and the drive assembly (7) comprises a mixing pipe (76), an air supply pipe (71) is fixed to one end of the mixing pipe (76), and the air supply pipe (71) is communicated with the combustion chamber of the incinerator (1), a long pipe (711) is fixed to the top of the preheating box (3), and the other end of the long pipe (711) is fixedly connected to the mixing pipe (76), piston rods (53) are slidably inserted into the interior of the first connecting pipe (51) and the second connecting pipe (52), and connecting assemblies (6) are arranged on the outside of the first connecting pipe (51) and the second connecting pipe (52).

2. A waste heat recovery system according to claim 1, characterized in that: A hollow tube (32) is rotatably mounted inside the preheating box (3) via a bearing, the top of the hollow tube (32) is rotatably connected to the pipe mouth of a second connecting tube (52) at the outlet end of the heat exchanger (2), a plurality of annular tubes (33) are equidistantly fixed on the surface of the hollow tube (32), and the inside of the annular tubes (33) is connected to the hollow tube (32), and an air inlet pipe (31) is provided on one side of the bottom of the preheating box (3).

3. A waste heat recovery system according to claim 2, characterized in that: The driving assembly (7) further comprises a transmission belt (72), the transmission belt (72) being rotatably mounted on the top of the preheating box (3) via a mounting plate, a pulley on one side of the transmission belt (72) being fixedly sleeved on the top of the hollow tube (32), and a first bevel gear (73) being fixedly mounted on the bottom of the pulley at the other end of the transmission belt (72), and a second bevel gear (74) being meshingly connected to one side of the bottom of the first bevel gear (73).

4. A waste heat recovery system according to claim 3, characterized in that: A gear ring frame (77) is rotatably mounted on the surface of the mixing tube (76) via a shaft ring, a stirring frame (78) is fixed to the gear ring frame (77) at the axis center inside the mixing tube (76), a transmission rod (75) is fixed to the rear end of the gear ring frame (77), and the transmission rod (75) is rotatably passed through the mixing tube (76) and is fixedly connected to the second bevel gear (74).

5. A waste heat recovery system according to claim 4, characterized in that: A motor (79) is fixed to the bottom of the mixing tube (76) located outside the gear ring frame (77), and a driving gear (710) is fixed to the output end of the motor (79), and the driving gear (710) is meshingly connected to the gear ring frame (77).

6. A waste heat recovery system according to claim 1, characterized in that: The connecting assembly (6) comprises an insert rod (54), the insert rod (54) being fixed to the same side of the piston column (53) inside the first connecting tube (51) and the second connecting tube (52), and the insert rod (54) slidingly passes through the first connecting tube (51) and the second connecting tube (52), and the two insert rods (54) at the inlet end and the top of the heat exchanger (2) and the two insert rods (54) at the outlet end and the bottom of the heat exchanger (2) are respectively fixed with connecting plates (55).

7. A waste heat recovery system according to claim 6, characterized in that: Ring ropes (56) are fixed at both ends of the piston column (53) of the first connecting pipe (51) at the upper end of the heat exchanger (2), and both ends of the ring rope (56) pass through the first connecting pipe (51). Guide blocks (57) are fixed at both ends of the first connecting pipe (51) corresponding to the positions where the ring rope (56) passes through, and the ring rope (56) slides through the guide blocks (57).

8. A waste heat recovery system according to claim 7, characterized in that: A connecting frame (58) is fixed on the outside of the ring rope (56), and the bottom of the other end of the connecting frame (58) is fixedly connected to the outlet end of the heat exchanger (2) and the connecting plate (55) connected to the bottom. An electric push rod (59) is fixed on the outer wall of the first connecting pipe (51) at the lower end of the heat exchanger (2), and the extended end of the electric push rod (59) is fixedly connected to the connecting plate (55).

9. A waste heat recovery system according to claim 2, characterized in that: A connecting pipe (41) is passed through the top of the preheating box (3); the other end of the connecting pipe (41) is fixedly connected to the exhaust gas treatment box (4); and the connecting pipe (41) is rotatably connected to the bottom of the hollow tube (32) via a bearing.

10. A shell and tube heat exchanger, characterized in that: A plurality of heat exchange tubes (21) are arranged equidistantly inside the heat exchanger (2); transverse tubes (24) are fixed at both ends of the heat exchanger (2), and the transverse tubes (24) are fixed on the surface of the second connecting tube (52); the heat exchange tubes (21) are fixedly connected to the transverse tubes (24); vertical tubes (23) are fixed at the top and bottom of the heat exchanger (2); the vertical tubes (23) are fixedly connected to the surface of the first connecting tube (51); a plurality of partitions (22) are fixed equidistantly inside the heat exchanger (2); the heat exchange tubes (21) slide through the partitions (22), and adjacent partitions (22) are arranged in an up-and-down manner.

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