Waste heat recovery device and system

Abstract

The invention relates to the technical field of waste heat recovery, and particularly discloses a waste heat recovery device and system.The waste heat recovery device comprises a barrel, the barrel is composed of an outer heat exchange barrel, an inner heat exchange barrel and a chassis, the outer heat exchange barrel and the inner heat exchange barrel are both coaxially fixed to the chassis, and an annular conveying cavity is formed between the outer heat exchange barrel and the inner heat exchange barrel and used for conveying flue gas; a spiral outer pipe and a spiral inner pipe are respectively wound and fixed on the outer heat exchange cylinder and the inner heat exchange cylinder, and the top ends of the outer pipe and the inner pipe are communicated through a connecting pipe; a pedestal is coaxially arranged on the top of the outer heat exchange cylinder and the top of the inner heat exchange cylinder, and an inner cavity communicating with the conveying cavity is formed in the pedestal. According to the waste heat recovery device and system, the spiral plate is matched with the outer heat exchange cylinder and the inner heat exchange cylinder to form a spiral flue gas channel in the conveying cavity, the moving path of flue gas in the conveying cavity is effectively prolonged, the residence time of the flue gas is prolonged, and heat exchange liquid in the outer pipe and the inner pipe can fully recover waste heat in the flue gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste heat recovery, in particular to a waste heat recovery device and system. BACKGROUND

[0002] Flue gas is the main way of energy waste of general energy-consuming equipment, and flue gas waste heat recovery is mainly to convert the heat carried by flue gas into usable heat through a certain heat exchange method. In order to further improve the thermal efficiency of the kiln, achieve the purpose of energy saving and consumption reduction, recovering flue gas waste heat is also an important energy saving way.

[0003] In the use of the existing flue gas waste heat recovery equipment, the self-cleaning effect of the heat exchange pipe is poor, and the flue gas inevitably contains small dust particles, which are easy to adhere to the heat exchange pipe. If it cannot be cleaned in time, as the amount of dust particles adhered increases, not only the heat exchange efficiency of the heat exchange pipe will be reduced, but also the corrosive components such as chlorides and sulfides contained in the dust will combine with the moisture in the flue gas to form an acidic environment, which will accelerate the corrosion of the heat exchange pipe and shorten the service life of the heat exchange pipe. SUMMARY

[0004] The present application provides a waste heat recovery device and system, which aims to solve the problem of poor self-cleaning effect of the heat exchange pipe in related technology, and the flue gas containing dust particles that are easy to adhere to the heat exchange pipe.

[0005] The waste heat recovery device of the present application comprises a cylinder, which is composed of an outer heat exchange cylinder, an inner heat exchange cylinder and a bottom disc, the outer heat exchange cylinder and the inner heat exchange cylinder are coaxially fixed on the bottom disc, and an annular conveying cavity is formed between the outer heat exchange cylinder and the inner heat exchange cylinder for conveying flue gas; The outer heat exchange cylinder and the inner heat exchange cylinder are respectively wound with a spiral outer pipe and an inner pipe, and the top ends of the outer pipe and the inner pipe are connected in communication through a connecting pipe; The top of the outer heat exchange cylinder and the inner heat exchange cylinder is coaxially provided with a pedestal, an inner cavity in communication with the conveying cavity is formed in the inside of the pedestal, a lifting ring is arranged in the inner cavity and can rotate relative to the pedestal, a spiral plate extending into the conveying cavity is fixedly installed on the lifting ring, the opposite sides of the spiral plate are respectively tightly arranged against the outer heat exchange cylinder and the inner heat exchange cylinder, and the spiral plate can rotate around the inner heat exchange cylinder with the rotation of the lifting ring; A converging cylinder is arranged above the pedestal for converging and discharging flue gas, a turbine is coaxially arranged in the inside of the converging cylinder and can rotate in the converging cylinder under the push of flue gas, and the turbine drives the rotation of the lifting ring.

[0006] Preferably, a ring-shaped stepped groove is coaxially formed in the top of the pedestal, a ring pedestal is arranged in the inside of the stepped groove and can rotate relative to the pedestal, and the lifting ring is coaxially fixed on the ring pedestal.

[0007] Preferably, a ring groove is coaxially formed in the top of the ring platform, a pressing block is fixedly installed on the connecting pipe, and the bottom end of the pressing block is slidingly arranged in the ring groove.

[0008] Preferably, the bottom end of the outer pipe is provided with a liquid inlet pipe, the bottom end of the inner pipe is provided with a liquid outlet pipe, the top end of the outer pipe and the top end of the inner pipe are provided with mounting seats, the mounting seats are provided with insertion grooves, the end of the connecting pipe is fixedly provided with an insertion plate which is inserted into the insertion grooves, the insertion plate is provided with a sealing gasket, the insertion plate and the mounting seats are provided with positioning holes which are in communication with each other, and the positioning holes are provided with fastening bolts.

[0009] Preferably, the turbine is fixedly provided with a connecting shaft which is rotatably arranged at the bottom of the converging cylinder, the connecting shaft is coaxially fixedly provided with a transmission gear, the top of the pedestal is rotatably provided with a driven gear which is engaged with the transmission gear, and the ring platform is coaxially fixedly provided with a driven gear ring which is engaged with the driven gear.

[0010] Preferably, the top of the pedestal is inserted with an inclined pipe which is in communication with the inner cavity, the top end of the inclined pipe is connected to the bottom of the converging cylinder and is located below the turbine, the top of the converging cylinder is provided with a conical portion, and the conical portion is provided with a top pipe.

[0011] Preferably, the bottom of the inner cavity is provided with collection grooves which are located at the side of the outer heat exchange cylinder and the inner heat exchange cylinder respectively, the inside of the collection grooves is provided with a push plate which is arranged in close contact with the side wall of the collection groove and can move in the collection groove along with the rotation of the lifting ring, the pedestal is provided with notches which are in communication with the collection grooves, and the notches are provided with stop blocks.

[0012] Preferably, the bottom of the lifting ring is provided with an arc-shaped groove, and the push plate is fixedly provided with a protruding block which extends into the arc-shaped groove.

[0013] A waste heat recovery system comprising the waste heat recovery device.

[0014] Beneficial effects: In use, the spiral plate cooperates with the outer heat exchange cylinder and the inner heat exchange cylinder to form a spiral flue gas passage in the conveying cavity, effectively prolongs the moving path of the flue gas in the conveying cavity, increases the residence time of the flue gas, enables the heat exchange liquid in the outer tube and the inner tube to fully recover the waste heat in the flue gas, and rotates around the inner heat exchange cylinder in the conveying cavity along with the flue gas, which can better scrape off the dust particles adhered to the outer heat exchange cylinder and the inner heat exchange cylinder, avoids the adhesion and accumulation of the dust particles on the outer heat exchange cylinder and the inner heat exchange cylinder, ensures the good heat exchange efficiency of the outer heat exchange cylinder and the inner heat exchange cylinder, avoids the corrosion and damage of the outer heat exchange cylinder and the inner heat exchange cylinder by the dust particles, effectively prolongs the service life of the equipment, can lift the dust particles by the spiral plate, then better cleans and recovers the dust in the conveying cavity, avoids the blockage of the conveying cavity by the dust particles, affects the airflow distribution in the conveying cavity and causes the local overheating of the outer heat exchange cylinder and the inner heat exchange cylinder, and improves the waste heat recovery effect of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the present application.

[0016] Figure 2 is a front view of the present application.

[0017] Figure 3 is a front sectional view of the present application.

[0018] Figure 4 is an enlarged structure schematic view of A in the present application. Figure 3

[0019] Figure 5 is a perspective view of the spiral plate of the present application.

[0020] Figure 6 is a front view of the ring table of the present application.

[0021] Figure 7 is a perspective view of the push plate of the present application.

[0022] Reference signs: ​10, cylinder; 11, outer heat exchange cylinder; 12, inner heat exchange cylinder; 13, bottom disc; 14, conveying cavity; 15, air inlet pipe; 20, pedestal; 21, inner cavity; 22, collecting groove; 23, stepped groove; 24, push plate; 241, protruding block; 25, notch; 26, stop block; 30, heat exchange pipe; 31, outer pipe; 32, inner pipe; 33, connecting pipe; 331, pressing block; 332, insertion plate; 34, liquid inlet pipe; 35, liquid outlet pipe; 36, mounting seat; 361, insertion slot; 37, fastening bolt; 40, cleaning assembly; 41, ring table; 411, ring groove; 42, lifting ring; 421, arc-shaped slot; 43, spiral plate; 50, exhaust assembly; 51, inclined pipe; 52, converging cylinder; 521, tapered portion; 53, top pipe; 60, transmission mechanism; 61, turbine; 62, connecting shaft; 63, transmission gear; 64, driven gear; 65, driven gear ring. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0024] As shown in Figures 1 to 7 , the waste heat recovery device of the present application comprises a cylinder 10, a pedestal 20, a heat exchange pipe 30, a cleaning assembly 40, an exhaust assembly 50, and a transmission mechanism 60. The heat exchange pipe 30 is arranged outside the cylinder 10 for conveying heat exchange liquid. The pedestal 20 is arranged at the top of the cylinder 10 for supporting the cleaning assembly 40 and the exhaust assembly 50. The flue gas in the cylinder 10 can be conveyed to the exhaust assembly 50 for discharge, so that the transmission mechanism 60 operates with the discharge of flue gas, drives the cleaning assembly 40 to clean the smoke dust particles in the cylinder 10, and collects the smoke dust particles by the pedestal 20.

[0025] Referring to Figure 1 , Figure 2 and Figure 3 , the cylinder 10 is composed of an outer heat exchange cylinder 11, an inner heat exchange cylinder 12, and a bottom disc 13. The outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 are coaxially fixed on the bottom disc 13, and the outer heat exchange cylinder 11 is coaxially sleeved outside the inner heat exchange cylinder 12. An annular conveying cavity 14 is formed between the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 for conveying flue gas. An air inlet pipe 15 is inserted on the bottom disc 13 for inputting flue gas.

[0026] Referring to Figure 1 , Figure 3 and Figure 4The pedestal 20 is annular and coaxially fixed on the top of the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12. An inner cavity 21 is formed in the pedestal 20 and communicates with the conveying cavity 14. A collecting groove 22 is arranged at the bottom of the inner cavity 21 and located at the side of the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, respectively, for collecting smoke dust particles. A ring-shaped stepped groove 23 is coaxially formed at the top of the pedestal 20 for mounting the cleaning assembly 40.

[0027] With reference to Figure 1 , Figure 3 and Figure 4 , the heat exchange pipe 30 is composed of an outer pipe 31, an inner pipe 32 and a connecting pipe 33. The outer pipe 31 and the inner pipe 32 are spiral and have concave cross sections. The outer pipe 31 and the inner pipe 32 are wound and fixed on the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, respectively, and are oppositely arranged. The two ends of the connecting pipe 33 are connected with the top ends of the outer pipe 31 and the inner pipe 32, respectively, so that the outer pipe 31 and the inner pipe 32 are communicated. The heat exchange liquid in the outer pipe 31 can enter the inner pipe 32 through the connecting pipe 33, so that the heat exchange liquid can be lifted and then lowered along the axial direction of the cylinder body 10, thereby prolonging the path of the heat exchange liquid and making the heat exchange more sufficient.

[0028] The bottom end of the outer pipe 31 is provided with a liquid inlet pipe 34 for inputting the heat exchange liquid. The bottom end of the inner pipe 32 is provided with a liquid outlet pipe 35 for outputting the heat exchange liquid. The top ends of the outer pipe 31 and the inner pipe 32 are provided with mounting seats 36. The mounting seats 36 are provided with insertion grooves 361. The end portion of the connecting pipe 33 is fixedly provided with an insertion plate 332 which is inserted into the insertion groove 361. The insertion plate 332 is provided with a sealing gasket. The insertion plate 332 is inserted into or separated from the insertion groove 361, so that the connecting pipe 33 can be better mounted and dismounted on the mounting seat 36. The sealing gasket seals the insertion plate 332 and the mounting seat 36, so as to prevent the heat exchange liquid from leaking. The insertion plate 332 and the mounting seat 36 are provided with positioning holes which are communicated with each other. A fastening bolt 37 is arranged in the positioning hole, so as to fix the insertion plate 332 and the mounting seat 36, thereby ensuring that the insertion plate 332 will not be separated from the insertion groove 361 during the operation of the equipment.

[0029] With reference to Figure 3 , Figure 4 , Figure 5 and Figure 6The cleaning assembly 40 comprises a ring table 41, a hanging ring 42 and a spiral plate 43. The ring table 41 is arranged in the stepped groove 23 and can rotate relative to the pedestal 20. The hanging ring 42 is coaxially fixed with the ring table 41 in the inner cavity 21. The spiral plate 43 is fixedly installed on the hanging ring 42, the bottom end of the spiral plate 43 extends to the bottom of the conveying cavity 14, and the opposite two side walls of the spiral plate 43 are tightly arranged against the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 respectively. A spiral flue is formed in the conveying cavity 14 by the spiral plate 43 cooperating with the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, so that the flue gas in the conveying cavity 14 is lifted spirally, the moving path of the flue gas in the conveying cavity 14 is prolonged, and the residence time of the flue gas in the conveying cavity 14 is increased, so that the waste heat can be fully recovered and utilized. At the same time, when the ring table 41 rotates, the spiral plate 43 can be moved in the conveying cavity 14 by the hanging ring 42, so that the spiral plate 43 rotates around the inner heat exchange cylinder 12, the soot particles adhering to the side walls of the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 are scraped off, and the soot particles are gradually lifted in the conveying cavity 14. Finally, the soot particles enter the inner cavity 21 from the conveying cavity 14, and the falling soot particles are collected by the collecting groove 22. The top of the ring table 41 is coaxially provided with a ring groove 411. The connecting pipe 33 is fixedly provided with a pressing block 331, and the bottom end of the pressing block 331 is slidingly arranged in the ring groove 411. The pressing block 331 can limit the ring table 41, so that the ring table 41 cannot be separated from the stepped groove 23, thereby ensuring the good operation of the equipment.

[0030] Reference Figure 4 , Figure 6 and Figure 7 The inside of the collecting groove 22 is provided with a push plate 24, and the push plate 24 is arranged against the side wall of the collecting groove 22 and can move in the collecting groove 22 with the rotation of the hanging ring 42. The pedestal 20 is provided with a notch 25 communicating with the collecting groove 22, and the notch 25 is provided with a stop block 26. The soot particles entering the collecting groove 22 are moved by the movement of the push plate 24 in the collecting groove 22, so that the soot particles are discharged and cleaned by the notch 25. The notch 25 is closed by the stop block 26, so as to prevent the flue gas from leaking out of the notch 25.

[0031] The bottom of the hanging ring 42 is provided with an arc-shaped groove 421, and the push plate 24 is fixedly provided with a protrusion 241 extending into the arc-shaped groove 421. With the rotation of the hanging ring 42, the protrusion 241 gradually moves outside the arc-shaped groove 421. When the protrusion 241 reaches the end of the arc-shaped groove 421, the hanging ring 42 pushes the protrusion 241 to move in the collecting groove 22, thereby cleaning the soot particles in the collecting groove 22.

[0032] Reference Figure 1 , Figure 2 and Figure 3The exhaust assembly 50 comprises the inclined pipes 51, the converging cylinder 52 and the top pipe 53, the inclined pipes 51 are inserted into the top of the pedestal 20 and communicated with the inner cavity 21, the converging cylinder 52 is arranged above the cylinder body 10, the top ends of the inclined pipes 51 are inserted into the bottom of the converging cylinder 52 and below the turbine 61, and the top pipe 53 is inserted into the top of the converging cylinder 52, so that the flue gas discharged from the inclined pipes 51 can be collected by the converging cylinder 52 and discharged by the top pipe 53.

[0033] With reference to Figure 1 , Figure 2 and Figure 3 , the transmission mechanism 60 comprises the turbine 61, the connecting shaft 62, the transmission gear 63, the driven gear 64 and the driven gear ring 65, the turbine 61 is coaxially arranged in the converging cylinder 52 and can rotate in the converging cylinder 52 under the push of the flue gas, the connecting shaft 62 is coaxially arranged at the bottom of the converging cylinder 52 and the top end of the connecting shaft 62 is fixed with the turbine 61, the transmission gear 63 is coaxially fixed on the connecting shaft 62, the driven gear 64 is rotatably arranged at the top of the pedestal 20 and engaged with the transmission gear 63, and the driven gear ring 65 is coaxially fixed on the ring platform 41 and engaged with the driven gear 64, so that the turbine 61 is rotated by the flue gas during the discharge, the turbine 61 drives the transmission gear 63 to rotate through the connecting shaft 62, the driven gear 64 is rotated under the push of the transmission gear 63, and the ring platform 41 is rotated in the stepped groove 23 under the push of the driven gear ring 65, so that the spiral plate 43 can move in the conveying cavity 14, the dust particles are scraped and conveyed to be lifted to complete the cleaning and collection.

[0034] The top of the converging cylinder 52 is provided with a tapered portion 521, the top pipe 53 is arranged on the tapered portion 521, and the turbine 61 is below the tapered portion 521, so that the space at the top of the converging cylinder 52 is gradually contracted by the tapered portion 521, the flow rate of the flue gas during the discharge is increased (such as the Venturi effect), the flue gas can better push the turbine 61 to rotate, and the cleaning of the dust particles is facilitated.

[0035] A waste heat recovery system comprising the waste heat recovery device.

[0036] Working principle: the flue gas is conveyed into the inside of the conveying cavity 14 through the gas inlet pipe 15, the flue gas is lifted along the spiral plate 43 and the flue gas passage formed by the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 in the conveying cavity 14, the heat exchange liquid is conveyed into the outer pipe 31 through the liquid inlet pipe 34 and lifted outside the outer heat exchange cylinder 11, the waste heat of the flue gas is recovered, the heat exchange liquid enters the inner pipe 32 through the connecting pipe 33 and is lowered around the outer side of the inner heat exchange cylinder 12, the waste heat of the flue gas is continuously recovered, and then the heat exchange liquid is discharged through the liquid outlet pipe 35.

[0037] The flue gas enters the inner cavity 21 of the pedestal 20, flows into the converging cylinder 52 through the inclined pipe 51, is discharged through the top pipe 53, and drives the turbine 61 to rotate while flowing in the converging cylinder 52, so that the connecting shaft 62 drives the transmission gear 63 to rotate, the driven gear 64 drives the driven gear ring 65 to rotate with the ring table 41, the lifting ring 42 rotates, the spiral plate 43 rotates around the inner heat exchange cylinder 12 in the conveying cavity 14, the soot particles on the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 are scraped and cleaned, and the soot particles are lifted into the inner cavity 21 and collected by the collecting groove 22.

[0038] The lifting ring 42 rotates to push the convex block 241, so that the push plate 24 slides in the collecting groove 22, and the soot particles are moved in the collecting groove 22. When the stop block 26 moves out, the soot particles can be discharged from the gap 25, and the cleaning of the soot particles is completed.

[0039] In the present application, the spiral plate 43 cooperates with the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 to form a spiral flue gas passage in the conveying cavity 14, effectively prolongs the moving path of the flue gas in the conveying cavity 14, increases the residence time of the flue gas, and enables the heat exchange liquid in the outer pipe 31 and the inner pipe 32 to fully recover the waste heat in the flue gas. At the same time, the spiral plate 43 rotates around the inner heat exchange cylinder 12 in the conveying cavity 14 with the discharge of the flue gas, which can better scrape the soot particles adhered to the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, avoid the adhesion and accumulation of the soot particles on the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, ensure the good heat exchange efficiency of the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, avoid the corrosion and damage of the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12 by the soot particles, effectively increase the service life of the equipment, and better clean and recover the soot in the conveying cavity 14 by lifting the soot particles by the spiral plate 43, avoid the blockage of the conveying cavity 14 by the soot particles, affect the airflow distribution in the conveying cavity 14 and cause local overheating of the outer heat exchange cylinder 11 and the inner heat exchange cylinder 12, and improve the waste heat recovery effect of the equipment.

[0040] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A waste heat recovery device, comprising a cylindrical body (10), characterized in that, The cylinder (10) is composed of an outer heat exchange cylinder (11), an inner heat exchange cylinder (12) and a chassis (13). The outer heat exchange cylinder (11) and the inner heat exchange cylinder (12) are coaxially fixed on the chassis (13), and an annular conveying cavity (14) is formed between the outer heat exchange cylinder (11) and the inner heat exchange cylinder (12) for conveying flue gas. The outer heat exchange cylinder (11) and the inner heat exchange cylinder (12) are respectively wound and fixed with a spiral outer tube (31) and an inner tube (32), and the top ends of the outer tube (31) and the inner tube (32) are connected by a connecting tube (33); A platform (20) is coaxially arranged on the top of the outer heat exchange cylinder (11) and the inner heat exchange cylinder (12). The platform (20) has an inner cavity (21) that communicates with the conveying chamber (14). A lifting ring (42) is arranged in the inner cavity (21) and can rotate relative to the platform (20). A spiral plate (43) extending into the conveying chamber (14) is fixedly installed on the lifting ring (42). The opposite side walls of the spiral plate (43) are respectively close to the outer heat exchange cylinder (11) and the inner heat exchange cylinder (12), and the spiral plate (43) can rotate around the inner heat exchange cylinder (12) as the lifting ring (42) rotates. A converging cylinder (52) is provided above the pedestal (20) for the collection and discharge of flue gas. A turbine (61) is coaxially arranged inside the converging cylinder (52), which can rotate inside the converging cylinder (52) under the drive of the flue gas and drive the hanging ring (42) to rotate.

2. The waste heat recovery device according to claim 1, characterized in that, The top of the pedestal (20) is coaxially provided with an annular stepped groove (23), and an annular platform (41) is provided inside the stepped groove (23), which can rotate relative to the pedestal (20). The lifting ring (42) is coaxially fixed on the annular platform (41).

3. The waste heat recovery device according to claim 2, characterized in that, The top of the ring platform (41) is coaxially provided with an annular groove (411), and a pressure block (331) is fixedly installed on the connecting pipe (33), and the bottom end of the pressure block (331) is slidably disposed in the annular groove (411).

4. The waste heat recovery device according to claim 3, characterized in that, The bottom end of the outer tube (31) is provided with an inlet pipe (34), and the bottom end of the inner tube (32) is provided with a drain pipe (35). The top ends of the outer tube (31) and the inner tube (32) are provided with mounting bases (36). The mounting bases (36) are provided with slots (361). The end of the connecting tube (33) is fixedly installed with a plate (332) inserted into the slot (361). The plate (332) is provided with a sealing gasket. The plate (332) and the mounting base (36) are provided with positioning holes that communicate with each other. The positioning holes are provided with fastening bolts (37).

5. The waste heat recovery device according to claim 4, characterized in that, The turbine (61) is fixed with a connecting shaft (62) rotatably mounted on the bottom of the converging cylinder (52). A transmission gear (63) is coaxially fixed on the connecting shaft (62). A driven gear (64) meshing with the transmission gear (63) is rotatably mounted on the top of the platform (20). A driven gear ring (65) meshing with the driven gear (64) is coaxially fixed on the ring platform (41).

6. The waste heat recovery device according to claim 5, characterized in that, The top of the platform (20) is connected to an inclined tube (51) that communicates with the inner cavity (21). The top end of the inclined tube (51) is connected to the bottom of the converging cylinder (52) and located below the turbine (61). The top of the converging cylinder (52) is provided with a conical part (521) and a top tube (53) is provided on the conical part (521).

7. The waste heat recovery device according to claim 1, characterized in that, The bottom of the inner cavity (21) is provided with a collection trough (22) located on the side of the outer heat exchange cylinder (11) and the inner heat exchange cylinder (12). A push plate (24) is provided inside the collection trough (22), and the push plate (24) is closely attached to the side wall of the collection trough (22). It can move in the collection trough (22) as the lifting ring (42) rotates. A notch (25) communicating with the collection trough (22) is provided on the platform (20), and a stop block (26) is provided in the notch (25).

8. The waste heat recovery device according to claim 7, characterized in that, The bottom of the lifting ring (42) is provided with an arc groove (421), and a protrusion (241) extending into the arc groove (421) is fixedly installed on the push plate (24).

9. A waste heat recovery system, characterized in that, It includes the waste heat recovery device according to any one of claims 1-8.

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