A waste heat utilization device for tubular heating furnace

Abstract

The present invention provides a waste heat utilization device for a tubular heating furnace, belonging to the technical field of waste heat utilization; comprising a box, air inlets and air outlets are respectively provided on both sides of the box, air ducts are fixed at the corresponding air inlets and air outlets on both sides of the box, the air ducts are connected to the box, an air inlet is provided at the bottom of the box, and an air outlet is provided at the top of the box, and also comprising: an inner sphere, a connecting block is fixed on the side of the inner wall of the box, an upper sealing plate is fixed on the side of the connecting block, a smoke flow channel is provided between the side of the upper sealing plate and the inner wall of the box, and a lower sealing plate is fixed on the inner wall of the box. The present invention is provided with a spherical shell and an inner sphere, and after the smoke enters the smoke pipe and is guided by the curved groove on the inner sphere, the windward surface of the spherical shell is heated, and the external airflow passes through the smoke pipe and the spherical shell, and the contact area with the external airflow is increased through the spherical shell, thereby improving the heat exchange rate between the smoke and the external airflow, thereby improving the heating effect of the external airflow.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat utilization, and in particular to a waste heat utilization device for a tubular heating furnace. Background Art

[0002] The tubular heating furnace is a process heating furnace used to heat gas or liquid, and the heated material is not water and steam, but flammable, explosive, easy to crack, easy to coke and highly corrosive oil and gas. Start the tubular heating furnace, and the liquid or gas fuel burns in the radiation chamber of the tubular heating furnace to heat the gas or liquid in the pipe in the radiation chamber. The high-temperature flue gas generated by the combustion enters the convection chamber of the tubular heating furnace, and the gas or liquid in the pipe in the convection chamber is heated by convection heat transfer. Then the flue gas enters the smoke pipe of the waste heat recovery device, and the external airflow is sent into the waste heat recovery device through the fan. In the recycling device, after the smoke pipe heats the external airflow, the heated airflow is sent back to the tubular heating furnace, thereby realizing the recovery and utilization of waste heat in the flue gas. The exhaust temperature of the heating furnace can be reduced to about 100 degrees Celsius, realizing partial condensation of acidic water vapor in the flue gas, and while recovering the low-temperature sensible heat of the flue gas, it can also recover part of the vaporization latent heat of acidic water vapor, further improving the thermal efficiency of the heating furnace and saving energy. The heating method of the tubular heating furnace is direct fire, and the furnace tube withstands high temperature, high pressure and medium corrosion, and the tubular heating furnace can operate continuously for a long period of time without interruption.

[0003] After searching, a Chinese patent with authorization announcement number CN212870796U discloses a cupola flue gas waste heat utilization system, which includes a heat exchange device, a blower and a dust collector. The cold air inlet of the heat exchange device is connected to the blower, the hot air outlet is connected to the bellows of the cupola, the high-temperature flue gas inlet is connected to the chimney of the cupola, and the low-temperature flue gas outlet is connected to the dust collector; the heat exchange device includes a shell, a cold air collecting bag, a hot air collecting bag and a plurality of heat exchange pipes, the high-temperature flue gas inlet is arranged at the top of the shell, the low-temperature flue gas outlet is arranged on one side of the bottom of the shell, the cold air collecting bag and the hot air collecting bag are respectively arranged between the high-temperature flue gas inlet and the low-temperature flue gas outlet of the shell, the cold air inlet is arranged in the cold air collecting bag, the hot air outlet is arranged in the hot air collecting bag, and a plurality of heat exchange pipes are arranged in the shell, and their two ends are respectively connected to the cold air collecting bag and the hot air collecting bag.

[0004] The above patent utilizes heat exchange tubes to achieve heat exchange between high-temperature flue gas and external airflow. The high-temperature flue gas passes through the surface of the heat exchange tubes, and the external airflow passes through the inside of the heat exchange tubes. The high-temperature flue gas heats the heat exchange tubes, and the airflow flowing through the inside of the heat exchange tubes is heated to achieve heat exchange. However, the contact area between the high-temperature flue gas and the heat exchange tubes is small, and the heat exchange rate needs to be improved. Therefore, the present application provides a tubular heating furnace waste heat utilization device to meet the needs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a waste heat utilization device for a tubular heating furnace to solve the problem that the heat exchange rate between high-temperature flue gas and external airflow needs to be improved.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A device for utilizing waste heat from a tubular heating furnace comprises a box body, wherein an air inlet and an air outlet are respectively provided on both sides of the box body, air ducts are fixed at the corresponding air inlets and air outlets on both sides of the box body, the air ducts are connected to the box body, an air inlet is provided at the bottom of the box body, and an air outlet is provided at the top of the box body, and further comprises:

[0008] An inner sphere, a connecting block is fixed on the side of the inner wall of the box body, an upper sealing plate is fixed on the side of the connecting block, a smoke circulation channel is arranged between the side of the upper sealing plate and the inner wall of the box body, a lower sealing plate is fixed on the inner wall of the box body, a plurality of smoke pipes for smoke circulation are arranged between the upper sealing plate and the lower sealing plate, a smoke inlet is arranged at the bottom of the lower sealing plate, a connecting frame is fixed on the inner wall of the smoke inlet, a vertical rod is fixed on the connecting frame, the vertical rod is located in the smoke pipe, and the diameter of the vertical rod is smaller than the inner diameter of the smoke pipe, the inner sphere is fixedly sleeved on the vertical rod, and the smoke pipe is provided with spherical shells evenly distributed along its axial direction, the surface of the inner sphere fits the inner wall of the spherical shell, a drainage block is fixed on the top of the inner wall of the smoke pipe, a smoke outlet is arranged on the circumferential surface of the smoke pipe corresponding to the position of the drainage block, a curved groove is arranged on the side of the inner sphere, and the curved groove faces the air inlet direction of the box body;

[0009] The flue gas enters the smoke pipe, and the curved grooves on the inner sphere guide the high-temperature smoke to heat the windward side of the spherical shell. The external airflow passes through the smoke pipe and the spherical shell, and the contact area with the external airflow is increased through the spherical shell.

[0010] Preferably, a plurality of convex rings are fixed on the surface of the spherical shell, and the surfaces of the convex rings are provided with curved drainage surfaces.

[0011] Preferably, two retaining rings are fixed on the surface of the spherical shell, the side surfaces of the retaining rings are fixedly connected to the ends of the convex rings, and the ends of the retaining rings are fixedly connected to the side surfaces of the smoke pipe.

[0012] Preferably, the smoke inlet is in the shape of a trumpet with its opening facing downward, and a downwardly curved surface is provided at the bottom of the connecting frame.

[0013] Preferably, a plurality of guide grooves are formed on the inner wall of the curved groove, a guide block is fixed on the inner wall of the guide groove, and an inclined guide surface is provided on the guide block.

[0014] Preferably, the bottom of the drainage block is V-shaped.

[0015] Preferably, the upper sealing plate is provided with a driving mechanism for driving the smoke pipe and the ball shell to rotate, the driving mechanism includes an electric push rod fixed to the side of the box body, the telescopic end of the electric push rod is fixed with a connecting plate, a rack is fixed on the side of the connecting plate close to the box body, a circular sleeve passes through the side of the box body, a box body is fixed to the upper sealing plate, the end of the circular sleeve is fixedly connected to the side of the box body, the inner wall of the circular sleeve is slidably connected to the surface of the rack, the top of the smoke pipe passes through the upper sealing plate and is fixed with a rotating shaft, the rotating shaft is located in the box body, a gear is fixedly sleeved on the rotating shaft, the end of the rack movably passes through the box body and extends to the inside of the box body, and the rack is meshed with the gear.

[0016] Preferably, a scraping surface is provided on the side surface of the inner wall of the curved groove, and the scraping surface is used for cleaning the inner wall of the spherical shell during the rotation of the spherical shell.

[0017] Preferably, the single rotation angle of the smoke tube and the spherical shell is 180 degrees.

[0018] Preferably, a bearing is embedded inside the upper sealing plate, and the inner wall of the bearing is fixedly connected to the circumferential surface of the smoke pipe.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] In the above scheme, through the arrangement of the spherical shell and the inner sphere, the spherical shell is fixed on the smoke pipe, and the inner sphere is located inside the spherical shell. After the smoke enters the smoke pipe and is guided by the curved groove on the inner sphere, the windward surface of the spherical shell is heated. The external airflow passes through the smoke pipe and the spherical shell, and the contact area with the external airflow is increased through the spherical shell, thereby improving the heat exchange rate between the smoke and the external airflow, thereby improving the heating effect of the external airflow.

[0021] Through the arrangement of the guide groove and the guide block, the guide groove is opened in the curved groove, the guide groove is used to allow the smoke to pass smoothly through the curved groove to prevent the smoke from being blocked at the curved groove position, the guide block is fixed in the guide groove, and the smoke flows to the side of the inner wall of the spherical shell corresponding to its windward surface after being guided by the guide surface on the guide block, thereby achieving heating of the windward surface of the spherical shell, thereby improving the heating efficiency of the windward surface of the spherical shell.

[0022] Through the setting of the convex ring and the baffle ring, the convex ring is fixed on the sphere. After the sphere is heated, the heat is transferred to the convex ring. The contact area between the sphere and the external airflow is increased through the convex ring, thereby further improving the heat exchange rate between the flue gas and the external airflow. The baffle ring is fixed on the spherical shell to block the airflow passing through the spherical shell, increase the contact time between the airflow and the spherical shell, and further improve the heat exchange rate between the flue gas and the external airflow.

[0023] Through the setting of the driving mechanism, the driving mechanism is used to drive the smoke pipe and the spherical shell to rotate one hundred and eighty degrees at a time, thereby preventing one side of the smoke pipe and the spherical shell from being eroded by the airflow for a long time, changing the contact position of the smoke pipe and the spherical shell with the external airflow, thereby extending the service life of the smoke pipe and the spherical shell, and during the rotation of the spherical shell, the inner wall of the spherical shell is cleaned through the scraping surface on the inner sphere, preventing dust particles in the smoke from adhering to the inner wall of the spherical shell and hindering the rotation of the spherical shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 It is a front cross-sectional view of the inner sphere of the present invention;

[0027] Figure 3 This is an enlarged view of the structure of the inner sphere of the present invention;

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the spherical shell of the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the curved groove of the present invention;

[0030] Figure 6 It is a top view of the cross section of the inner sphere of the present invention;

[0031] Figure 7 It is a top cross-sectional view of the rack of the present invention;

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the connecting frame of the present invention.

[0033] [Reference Signs]

[0034] 1. Box body; 2. Air duct; 3. Smoke duct; 4. Upper sealing plate; 5. Lower sealing plate; 6. Ball shell; 7. Inner sphere; 71. Curved groove; 72. Guide groove; 73. Guide block; 74. Guide surface; 75. Scraping surface; 8. Driving mechanism; 81. Electric push rod; 82. Connecting plate; 83. Rack; 84. Gear; 85. Rotating shaft; 86. Box body; 87. Round sleeve; 9. Smoke outlet; 10. Guide block; 11. Convex ring; 12. Retaining ring; 13. Vertical rod; 14. Connecting frame; 15. Smoke inlet; 16. Connecting block.

[0035] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0036] The following is a detailed description of a tubular heating furnace waste heat utilization device provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0037] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0038] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0039] like Figure 1-Figure 8 As shown, an embodiment of the present invention provides a waste heat utilization device for a tubular heating furnace, comprising a box body 1, with air inlets and air outlets respectively provided on both sides of the box body 1, air ducts 2 are fixed at the corresponding air inlets and air outlets on both sides of the box body 1, the air ducts 2 are connected to the box body 1, an air inlet is provided at the bottom of the box body 1, and an air outlet is provided at the top of the box body 1, the smoke generated during the operation of the tubular heating furnace enters from the air inlet at the bottom of the box body 1 and is discharged from the air outlet position at the top, the outside air enters the box body 1 from the left air duct 2 and is discharged from the right air duct 2, and the exhausted airflow flows back to the tubular heating furnace after being guided by the pipeline, and also includes:

[0040] Inner sphere 7, a connecting block 16 is fixed on the side of the inner wall of the box body 1, an upper sealing plate 4 is fixed on the side of the connecting block 16, the connecting block 16 is used for connecting and fixing the upper sealing plate 4 to the box body 1, a smoke circulation channel is arranged between the side of the upper sealing plate 4 and the inner wall of the box body 1, the smoke circulation channel is used for the passage of smoke, a lower sealing plate 5 is fixed on the inner wall of the box body 1, a plurality of smoke pipes 3 for smoke circulation are arranged between the upper sealing plate 4 and the lower sealing plate 5, a sealing ring is inlaid at the corresponding position of the smoke pipe 3 inside the lower sealing plate 5, the sealing ring is used for sealing between the smoke pipe 3 and the lower sealing plate 5, a smoke inlet 15 is opened at the bottom of the lower sealing plate 5, the central axis of the smoke inlet 15 coincides with the central axis of the smoke pipe 3, a connecting frame 14 is fixed on the inner wall of the smoke inlet 15, a vertical rod 13 is fixed on the connecting frame 14, and the connecting frame 14 is used for connecting and fixing the vertical rod 13 to the lower sealing plate 5 The vertical rod 13 is located in the smoke tube 3, and the diameter of the vertical rod 13 is smaller than the inner diameter of the smoke tube 3. The inner sphere 7 is fixedly sleeved on the vertical rod 13, and the vertical rod 13 is fixed, so as to fix the inner sphere 7. The smoke tube 3 is provided with spherical shells 6 evenly spaced along its axial direction. The spherical shells 6 are made of copper-titanium alloy. While having good thermal conductivity, they also have high strength, corrosion resistance and high temperature resistance. The surface of the inner sphere 7 fits the inner wall of the spherical shell 6. A drainage block 10 is fixed on the top of the inner wall of the smoke tube 3. A smoke outlet 9 is provided on the circumferential surface of the smoke tube 3 corresponding to the position of the drainage block 10. There are two smoke outlets 9 on each smoke tube 3. The two smoke outlets 9 are symmetrically arranged with the central vertical plane passing through the smoke tube 3 as the symmetry plane. A curved groove 71 is provided on the side of the inner sphere 7, and the curved groove 71 faces the air inlet direction of the box body 1.

[0041] The flue gas enters the smoke pipe 3, and the curved groove 71 on the inner sphere 7 guides the high-temperature flue gas to heat the windward side of the spherical shell 6. The external airflow passes through the smoke pipe 3 and the spherical shell 6, and the contact area with the external airflow is increased through the spherical shell 6, thereby improving the heat exchange rate between the flue gas and the external airflow, thereby improving the heating effect of the external airflow. The heated airflow flows into the pipeline from the right side air duct 2, and then flows from the pipeline to the tubular heating furnace, thereby realizing the utilization of the waste heat of the flue gas in the tubular heating furnace.

[0042] like Figure 4 As shown, in this embodiment, a plurality of convex rings 11 are fixed on the surface of the spherical shell 6, and a curved guide surface is provided on the surface of the convex ring 11. The convex ring 11 is used to increase the contact area between the airflow and the spherical shell 6, thereby further improving the heat exchange rate between the flue gas and the external airflow, and the guide surface is used to increase the contact area between the airflow and the convex ring 11, thereby improving the heating effect of the convex ring 11 on the airflow.

[0043] like Figure 4As shown, in this embodiment, two baffle rings 12 are fixed on the surface of the spherical shell 6, the side of the baffle ring 12 is fixedly connected to the end of the convex ring 11, and the end of the baffle ring 12 is fixedly connected to the side of the smoke pipe 3. The baffle ring 12 is fixed on the spherical shell 6 to block the airflow passing through the spherical shell 6, increase the contact time between the airflow and the spherical shell 6, and improve the heating effect of the airflow, thereby further improving the heat exchange rate between the flue gas and the external airflow.

[0044] like Figure 2 As shown, in this embodiment, the smoke inlet 15 is in the shape of a trumpet with an opening facing downward, and a downward curved surface is provided at the bottom of the connecting frame 14. The smoke inlet 15 is in the shape of a trumpet and is used to guide the passing smoke so that the smoke can smoothly enter the smoke pipe 3. The bottom of the connecting frame 14 is a downward curved surface. Through the design of the curved surface, the obstruction of the connecting frame 14 to the flow of smoke is reduced, so that the smoke can pass through the connecting frame 14 more smoothly.

[0045] like Figure 5 As shown, in this embodiment, a plurality of guide grooves 72 are opened on the inner wall of the curved groove 71, and a guide block 73 is fixed on the inner wall of the guide groove 72. An inclined guide surface 74 is arranged on the guide block 73. The guide groove 72 is used to allow the smoke to pass smoothly through the curved groove 71 to prevent the smoke from being blocked at the curved groove 71, so that the flow of the smoke is more productive. The guide block 73 is fixed in the guide groove 72. When the smoke passes through the guide groove 72, it is guided by the guide surface 74 on the guide block 73 and flows to the inner wall of the spherical shell 6 corresponding to its windward surface, so as to heat the windward surface of the spherical shell 6, thereby improving the heating efficiency of the windward surface of the spherical shell 6.

[0046] like Figure 2 As shown, in this embodiment, the bottom of the drainage block 10 is V-shaped. The V-shape allows the smoke to automatically disperse to both sides when passing through the drainage block 10, preventing the smoke from accumulating at the drainage block 10 and making the smoke flow smoother.

[0047] like Figure 2 and Figure 7As shown, in this embodiment, a driving mechanism 8 for driving the smoke pipe 3 and the ball shell 6 to rotate is arranged on the upper sealing plate 4, and the driving mechanism 8 includes an electric push rod 81 fixed to the side of the box body 1, and a connecting plate 82 is fixed to the telescopic end of the electric push rod 81, and a rack 83 is fixed to the side of the connecting plate 82 close to the box body 1, and a round sleeve 87 passes through the side of the box body 1, and a box body 86 is fixed on the upper sealing plate 4, and the end of the round sleeve 87 is fixedly connected to the side of the box body 86, and the inner wall of the round sleeve 87 is slidably connected to the surface of the rack 83, and the top of the smoke pipe 3 passes through the upper sealing plate 4 and is fixed with a rotating shaft 85, and the rotating shaft 85 is located in the box body 86, and a gear 84 is fixedly sleeved on the rotating shaft 85, and the end of the rack 83 The movable part passes through the box body 86 and extends to the inside of the box body 86. The rack 83 is meshed with the gear 84. A sealing ring is embedded in the circular sleeve 87. The sealing ring is used for sealing between the rack 83 and the circular sleeve 87 to prevent smoke from flowing out from the circular sleeve 87. The push rod of the electric push rod 81 is extended to drive the rack 83 to move rightward along the inner wall of the circular sleeve 87 through the connecting plate 82. The rack 83 drives the gear 84 to rotate. The gear 84 drives the smoke pipe 3 and the ball shell 6 to rotate through the rotating shaft 85 to prevent one side of the smoke pipe 3 and the ball shell 6 from being eroded by the external airflow for a long time. By changing the contact position of the smoke pipe 3 and the ball shell 6 with the external airflow, the service life of the smoke pipe 3 and the ball shell 6 is extended.

[0048] like Figure 6 As shown, in this embodiment, a scraping surface 75 is provided on the side of the inner wall of the curved groove 71. The scraping surface 75 is used to clean the inner wall of the spherical shell 6 during the rotation of the spherical shell 6. During the rotation of the spherical shell 6, the inner wall of the spherical shell 6 passes through the scraping surface 75 on the inner sphere 7. The inner wall of the spherical shell 6 is cleaned through the edge position of the scraping surface 75 to prevent dust particles in the flue gas from adhering to the inner wall of the spherical shell 6 and hindering the rotation of the spherical shell 6, thereby ensuring the smooth rotation of the spherical shell 6.

[0049] like Figure 2 and Figure 7 As shown, in this embodiment, the single rotation angle of the smoke tube 3 and the spherical shell 6 is 180 degrees. When the push rod of the electric push rod 81 is extended to the longest and retracted to the shortest, the smoke tube 3 and the spherical shell 6 rotate 180 degrees, thereby realizing the change of the windward surface of the smoke tube 3 and the spherical shell 6.

[0050] like Figure 2 As shown, in this embodiment, a bearing is embedded inside the upper sealing plate 4, and the inner wall of the bearing is fixedly connected to the circumferential surface of the smoke pipe 3. The bearing is used to make the rotation of the smoke pipe 3 more stable and smooth.

[0051] Working principle: The smoke generated during the operation of the tubular heating furnace enters the box body 1 from the air inlet of the box body 1, and enters the smoke pipe 3 after being guided by the smoke inlet 15, and passes through the interior of multiple spherical shells 6 in sequence, and is discharged from the smoke outlet 9 at the top of the smoke pipe 3. The exhausted smoke enters the chimney of the tubular heating furnace along the smoke flow channel, and is discharged from the top of the chimney;

[0052] When the smoke enters the spherical shell 6, after being guided by the curved groove 71 and the guide block 73 on the inner sphere 7, the windward surface of the spherical shell 6 is heated. The external airflow enters the box body 1 from the air duct 2 on the left side of the box body 1 and passes through the smoke pipe 3 and the spherical shell 6. The contact area with the external airflow is increased through the spherical shell 6 and the convex ring 11 fixed on the spherical shell 6. At the same time, the baffle ring 12 on the spherical shell 6 is used to block the airflow passing through the sphere, increase the contact area between the airflow and the sphere, and improve the heat exchange rate between the smoke and the external airflow, thereby improving the heating effect of the external airflow;

[0053] The electric push rod 81 of the driving mechanism 8 is started, and the push rod of the electric push rod 81 extends to drive the connecting plate 82 to move rightward, and the connecting plate 82 drives the rack 83 to move rightward along the inner wall of the circular sleeve 87. The rack 83 moves and drives the gear 84 to rotate. The gear 84 drives the smoke tube 3 and the ball shell 6 to rotate through the rotating shaft 85. When the push rod of the electric push rod 81 is extended to the longest, the smoke tube 3 and the ball shell 6 rotate 180 degrees, thereby preventing one side of the smoke tube 3 and the ball shell 6 from being eroded by the external airflow for a long time. By changing the contact position between the smoke tube 3 and the ball shell 6 and the external airflow, the service life of the smoke tube 3 and the ball shell 6 is extended. The inner sphere 7 is fixed on the vertical rod 13, and the end of the vertical rod 13 The connecting frame 14 is fixed in the smoke inlet 15 of the lower sealing plate 5, thereby preventing the inner sphere 7 from rotating with the spherical shell 6. During the rotation of the spherical shell 6, the inner wall of the spherical shell 6 passes through the scraping surface 75 on the inner sphere 7, and the inner wall of the spherical shell 6 is cleaned by the edge position of the scraping surface 75, so as to prevent the dust particles in the smoke from adhering to the inner wall of the spherical shell 6 and hindering the rotation of the spherical shell 6, thereby ensuring the smooth rotation of the spherical shell 6. After a period of use, the push rod of the electric push rod 81 can be driven to shorten, so that the connecting plate 82 drives the rack 83 to move in the opposite direction, and the rack 83 drives the gear 84 to rotate in the opposite direction, so that the smoke pipe 3 and the spherical shell 6 are rotated to the initial state, and the position of the smoke pipe 3 and the spherical shell 6 is changed again.

[0054] The present invention encompasses any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0055] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for utilizing waste heat from a tubular heating furnace, comprising a box body (1), wherein an air inlet and an air outlet are respectively provided on both sides of the box body (1), air ducts (2) are fixed at the corresponding air inlets and air outlets on both sides of the box body (1), the air ducts (2) are connected to the box body (1), an air inlet is provided at the bottom of the box body (1), and an air outlet is provided at the top of the box body (1), wherein: Also includes: An inner sphere (7), a connecting block (16) is fixed to the side of the inner wall of the box (1), an upper sealing plate (4) is fixed to the side of the connecting block (16), a smoke flow channel is arranged between the side of the upper sealing plate (4) and the inner wall of the box (1), a lower sealing plate (5) is fixed to the inner wall of the box (1), a plurality of smoke pipes (3) for smoke flow are arranged between the upper sealing plate (4) and the lower sealing plate (5), a smoke inlet (15) is opened at the bottom of the lower sealing plate (5), a connecting frame (14) is fixed to the inner wall of the smoke inlet (15), a vertical rod (13) is fixed to the connecting frame (14), the vertical rod (13) is located in the smoke pipe (3), and the diameter of the vertical rod (13) is smaller than the inner diameter of the smoke pipe (3), and the inner The sphere (7) is fixedly sleeved on the vertical rod (13); the smoke pipe (3) is provided with spherical shells (6) evenly spaced along the axial direction thereof; the surface of the inner sphere (7) is in contact with the inner wall of the spherical shell (6); a guide block (10) is fixed to the top of the inner wall of the smoke pipe (3); a smoke outlet (9) is provided on the circumferential surface of the smoke pipe (3) at a position corresponding to the guide block (10); a curved groove (71) is provided on the side surface of the inner sphere (7); the curved groove (71) faces the air inlet of the box (1); a plurality of guide grooves (72) are provided on the inner wall of the curved groove (71); a guide block (73) is fixed to the inner wall of the guide groove (72); and an inclined guide surface (74) is provided on the guide block (73); The smoke enters the smoke pipe (3), and the curved grooves (71) on the inner sphere (7) guide the high-temperature smoke, thereby heating the windward surface of the spherical shell (6). The external airflow passes through the smoke pipe (3) and the spherical shell (6), and the contact area with the external airflow is increased through the spherical shell (6).

2. The waste heat utilization device of the tubular heating furnace according to claim 1, characterized in that: A plurality of convex rings (11) are fixed on the surface of the spherical shell (6), and a curved drainage surface is provided on the surface of the convex ring (11).

3. The waste heat utilization device of a tubular heating furnace according to claim 1, characterized in that: Two retaining rings (12) are fixed on the surface of the spherical shell (6); the side surfaces of the retaining rings (12) are fixedly connected to the ends of the convex rings (11); and the ends of the retaining rings (12) are fixedly connected to the side surfaces of the smoke pipe (3).

4. The waste heat utilization device of a tubular heating furnace according to claim 1, characterized in that: The smoke inlet (15) is in the shape of a trumpet with its opening facing downward, and the bottom of the connecting frame (14) is provided with a curved surface that bends downward.

5. The waste heat utilization device of a tubular heating furnace according to claim 1, characterized in that: The bottom of the drainage block (10) is V-shaped.

6. The waste heat utilization device of a tubular heating furnace according to claim 1, characterized in that: The upper sealing plate (4) is provided with a driving mechanism (8) for driving the smoke pipe (3) and the ball shell (6) to rotate, the driving mechanism (8) comprising an electric push rod (81) fixed to the side of the box body (1), a connecting plate (82) fixed to the telescopic end of the electric push rod (81), a rack (83) fixed to the side of the connecting plate (82) close to the box body (1), a round sleeve (87) passing through the side of the box body (1), a box body (86) fixed to the upper sealing plate (4), and a round sleeve (87) passing through the side of the box body (1). The end of the sleeve (87) is fixedly connected to the side of the box body (86), the inner wall of the circular sleeve (87) is slidably connected to the surface of the rack (83), the top of the smoke pipe (3) passes through the upper sealing plate (4) and is fixed with a rotating shaft (85), the rotating shaft (85) is located in the box body (86), and a gear (84) is fixedly sleeved on the rotating shaft (85), the end of the rack (83) movably passes through the box body (86) and extends into the inside of the box body (86), and the rack (83) is meshed with the gear (84).

7. The waste heat utilization device of the tubular heating furnace according to claim 6, characterized in that: A scraping surface (75) is provided on the side surface of the inner wall of the curved groove (71), and the scraping surface (75) is used to clean the inner wall of the spherical shell (6) during the rotation of the spherical shell (6).

8. The waste heat utilization device of a tubular heating furnace according to claim 6, characterized in that: The single rotation angle of the smoke tube (3) and the spherical shell (6) is both 180 degrees.

9. The waste heat utilization device of a tubular heating furnace according to claim 6, characterized in that: A bearing is embedded inside the upper sealing plate (4), and the inner wall of the bearing is fixedly connected to the circumferential surface of the smoke pipe (3).

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