Waste heat utilization device of tubular furnace

Abstract

The present application belongs to the technical field of waste heat recovery of tubular furnace, especially to a waste heat utilization device of tubular furnace, comprising a heat exchange tank, one end of the inside of the heat exchange tank is provided with a main heat exchange coil pipe, and the other end of the inside of the heat exchange tank is provided with a secondary heat exchange coil pipe, the outer wall of the inside of the heat exchange tank penetrating the main heat exchange coil pipe and the secondary heat exchange coil pipe is provided with a flow guide assembly. The present application controls the rotation of the passive main shaft through the limiting type driving assembly, and under the linkage of the connecting rod assembly, the gap synchronous change of the movable heat exchange plate, the baffle and the fixed heat exchange plate can be realized, the heat exchange intensity is dynamically adjustable, which helps to improve the energy utilization rate. When the flow guide assembly moves, it can drive the rotation of the rotating sleeve and the spiral scraper, thereby realizing the dynamic cleaning of the coil pipe. The coil pipe cleaning assembly is mechanically linked with the flow guide assembly, the connecting rod assembly and the limiting type driving assembly, without additional power, reducing the accumulation of dust on the surface of the coil pipe, and helping to maintain the heat transfer efficiency for a long time.

Description

Technical Field

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

[0002] A tube furnace is a high-temperature heating device used in industrial or laboratory applications, with a tubular hearth as its core heating chamber. By wrapping heating elements (such as resistance wire, silicon carbon rods, silicon molybdenum rods, etc.) around a high-temperature and corrosion-resistant tube (typically a quartz tube, corundum tube, or metal tube), and using a precise temperature control system, the material placed inside the tube undergoes heat treatment processes such as heating, sintering, annealing, synthesis, decomposition, atmosphere protection, and chemical vapor deposition (CVD) in a controlled atmosphere.

[0003] Tubular furnaces, as key heating equipment in the chemical and metallurgical industries, emit high-temperature exhaust gases (typically 300–600°C) containing significant amounts of waste heat. Traditional waste heat recovery devices often employ fixed heat exchange structures, where the high-temperature exhaust gases pass through coils within a heat exchanger, heating a cold medium (such as water or air) into a usable heat medium. However, this design suffers from the following drawbacks:

[0004] First, the heat exchange intensity is not adjustable: the fixed baffles result in a constant heat exchange path between the exhaust gas and the coil. When the temperature of the medium in the main heat exchange coil needs to be increased (e.g., due to process requirements), the heat exchange area cannot be increased; conversely, when the temperature needs to be reduced (e.g., due to medium overheating), the heat exchange intensity cannot be reduced, resulting in low energy efficiency.

[0005] Furthermore, the coils suffer from severe dust accumulation: dust particles in the exhaust gas easily adhere to the coil surface, forming an insulating layer that reduces heat transfer efficiency. Existing technologies require downtime and disassembly for cleaning, impacting production continuity, and the fixed structure makes online cleaning difficult. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a waste heat utilization device for a tubular furnace, which overcomes the deficiencies of the prior art and effectively solves the problems of unadjustable heat exchange intensity and serious dust accumulation in the coil.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A waste heat utilization device for a tubular furnace includes a heat exchange tank, wherein a main heat exchange coil is provided at one end of the interior of the heat exchange tank, and an auxiliary heat exchange coil is provided at the other end of the interior of the heat exchange tank. A flow guide assembly is provided on the outer walls of the main heat exchange coil and the auxiliary heat exchange coil, and the flow guide assembly includes a fixed heat exchange plate, a movable heat exchange plate, and a baffle, wherein the fixed heat exchange plate is fixedly connected to the inner wall of one end of the heat exchange tank, the movable heat exchange plate is provided on the inner wall of the other end of the heat exchange tank, and the baffle is distributed between the fixed heat exchange plate and the movable heat exchange plate;

[0009] A connecting rod assembly is provided on the top outer wall of the guide assembly, a passive main shaft is rotatably connected to the inner wall of one end of the heat exchange tank, and a first bevel gear is welded to the outer wall of one end of the passive main shaft, a second bevel gear is meshed on the outer wall of the first bevel gear, and a limited drive assembly is provided on the outer wall of one side of the second bevel gear, and a coil cleaning assembly is provided on the outer walls of the main heat exchange coil and the auxiliary heat exchange coil.

[0010] Preferably, the connecting rod assembly includes a column, a lower connecting rod, an upper connecting rod and an axle pin, the fixed heat exchange plate, the movable heat exchange plate and the top outer wall of the deflector baffle are all provided with grooves, and the column is fixedly connected to the bottom inner wall of the groove, the lower connecting rod and the upper connecting rod are both rotatably connected to the outer wall of the column, the axle pin is fixedly connected to the inner walls at both ends of the lower connecting rod, and the axle pin is slidably connected to the inner walls at both ends of the upper connecting rod, wherein the lower connecting rod and the upper connecting rod are alternately distributed in sequence on the top of the inner wall of the heat exchange tank.

[0011] Preferably, the movable heat exchange plate is screwed onto the outer wall of the passive main shaft, and the fixed heat exchange plate and the deflection baffle are both slidably connected to the outer wall of the passive main shaft.

[0012] Preferably, the limiting drive assembly includes a driving screw, a limiting plate for limiting the maximum gap of the guide assembly, a mounting plate, a limiting sleeve for limiting the minimum gap of the guide assembly and a threaded disk, wherein the driving screw is welded to an outer wall of one side of the second bevel gear, and the driving screw is rotatably connected to the inner wall of the heat exchange tank through a bearing, the limiting plate is welded to the outer wall of the driving screw, and the limiting plate is located on the outside of the heat exchange tank, the mounting plate is fixedly connected to the outer wall of one side of the heat exchange tank by screws, the limiting sleeve is welded to the outer wall of one side of the mounting plate, and the driving screw is arranged through the inside of the limiting sleeve, the threaded disk is screwed to the outer wall of the driving screw, and the threaded disk is located between the limiting plate and the limiting sleeve.

[0013] Preferably, the limiting drive assembly also includes a first guide rod symmetrically distributed on both sides of the limiting sleeve, the outer wall of one end of the first guide rod is fixedly connected to the outer wall of one side of the mounting plate, and the first guide rod is slidably connected to the inner walls of both ends of the threaded disk.

[0014] Preferably, the coil cleaning assembly includes a fixed disk, a rotating sleeve, a spiral scraper, a docking rod, a guide ball, a guide sleeve and a spiral groove, wherein the fixed disk is welded to the outer wall of one side of the movable heat exchange plate and the baffle, the guide sleeve is welded to the outer wall of the other side of the fixed heat exchange plate and the baffle, the rotating sleeve is rotatably connected to the inner wall of one side of the fixed disk, the spiral scraper is welded to the outer wall of one side of the rotating sleeve, and the spiral scraper is tightly attached to the outer walls of the main heat exchange coil and the auxiliary heat exchange coil, the docking rod is welded to the outer wall of the top of the rotating sleeve, the guide ball is welded to the outer wall of one end of the docking rod, the spiral groove is opened on the outer wall of the guide sleeve, and the guide ball is slidably connected to the inner wall of the spiral groove;

[0015] The fixed plate is arranged on one side of the guide sleeve, and the coil cleaning assembly is located between two adjacent fixed heat exchange plates and deflection baffles, between the deflection baffles and the deflection baffles, and between the deflection baffles and the deflection baffles.

[0016] Preferably, a hot air inlet pipe is installed on the outer wall of one end of the heat exchange tank, and a cold air outlet pipe is installed on the other end of the outer wall of one side of the heat exchange tank.

[0017] Preferably, the outer wall of one end of the main heat exchange coil is fixedly connected to the first cold medium inlet pipe through a flange, and the outer wall of the other end of the main heat exchange coil is fixedly connected to the first hot medium outlet pipe through a flange.

[0018] Preferably, the outer wall of one end of the auxiliary heat exchange coil is fixedly connected to the second cold medium inlet pipe through a flange, and the outer wall of the other end of the auxiliary heat exchange coil is fixedly connected to the second hot medium outlet pipe through a flange.

[0019] Preferably, linear bearings are installed on the inner walls of the fixed heat exchange plate, movable heat exchange plate and deflector baffle, and the inner walls of the linear bearings are slidably connected to second guide rods, and the outer walls at both ends of the second guide rods are respectively welded to the inner walls at both ends of the heat exchange tank.

[0020] The beneficial effects of the present invention are:

[0021] 1. The waste heat utilization device for a tubular furnace of the present invention controls the rotation of a passive main shaft through a limited drive assembly. Under the mutual engagement of a first bevel gear and a second bevel gear, the movable heat exchange plate is driven to move axially along the passive main shaft. In addition, under the linkage of a connecting rod assembly, the gaps between the movable heat exchange plate, the baffle plate, and the fixed heat exchange plate can be changed synchronously. The heat exchange intensity is dynamically adjustable, which helps to improve energy utilization.

[0022] 2. The waste heat utilization device of the tubular furnace of the present invention rotates the driving screw to bring the threaded disk close to the limiting sleeve, and the movable heat exchange plate can move toward the main heat exchange coil side, so that the gap of the guide component is reduced to the minimum design value, forcing more exhaust gas to be diverted and flush the main heat exchange coil, significantly improving its heat exchange efficiency. When the driving screw is rotated in the opposite direction to bring the threaded disk close to the limiting plate, the gap of the guide component can be controlled to expand to the maximum value, reducing the exhaust gas flow contacted by the main heat exchange coil. The residual heat can be heat exchanged with the auxiliary heat exchange coil, realizing precise control of the medium temperature and avoiding energy waste.

[0023] 3. In the waste heat utilization device for a tubular furnace of the present invention, when the flow guide assembly moves, relative displacement occurs between the fixed plate and the guide sleeve, forcing the guide balls to slide along the spiral grooves, driving the rotating sleeve and spiral scraper to rotate. Because the spiral scraper closely adheres to the outer walls of the primary and secondary heat exchange coils, dynamic cleaning of the coils is achieved. The coil cleaning assembly is mechanically linked with the flow guide assembly, connecting rod assembly, and limited drive assembly, eliminating the need for additional power, reducing dust accumulation on the coil surface, and helping to maintain long-term heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structure of the waste heat utilization device of a tubular furnace proposed by the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The overall structure of the waste heat utilization device of a tubular furnace proposed by the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 This is a schematic diagram of the internal structure of the heat exchange tank of a waste heat utilization device for a tubular furnace proposed in the present invention;

[0027] Figure 4 A side view of the internal structure of a heat exchange tank of a waste heat utilization device for a tubular furnace proposed by the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of the heat exchange tank top of a waste heat utilization device for a tubular furnace proposed by the present invention;

[0029] Figure 6 A top view of the internal structure of a heat exchange tank of a waste heat utilization device for a tubular furnace proposed in the present invention;

[0030] Figure 7 This is a schematic diagram of the internal connection structure of a heat exchange tank of a waste heat utilization device for a tubular furnace proposed in the present invention;

[0031] Figure 8 This is a schematic diagram of the connection structure of the guide assembly and the connecting rod assembly of the waste heat utilization device of a tubular furnace proposed by the present invention;

[0032] Figure 9 This is an enlarged schematic diagram of the structure of part A of a waste heat utilization device for a tubular furnace proposed in the present invention;

[0033] Figure 10 This is an enlarged schematic diagram of the structure of part B of a waste heat utilization device for a tubular furnace proposed in the present invention;

[0034] Figure 11 This is a schematic structural diagram of the assembly of a coil cleaning assembly of a waste heat utilization device for a tubular furnace proposed by the present invention;

[0035] Figure 12 This is a schematic structural diagram of a disassembled coil cleaning assembly of a waste heat utilization device for a tubular furnace proposed in the present invention.

[0036] In the figure: 1. heat exchange tank; 2. main heat exchange coil; 3. auxiliary heat exchange coil; 4. flow guide assembly; 41. fixed heat exchange plate; 42. movable heat exchange plate; 43. baffle; 5. connecting rod assembly; 51. column; 52. lower connecting rod; 53. upper connecting rod; 54. shaft pin; 6. passive main shaft; 7. first bevel gear; 8. second bevel gear; 9. limited drive assembly; 91. drive screw; 92. limit plate; 93. mounting plate; 94. limit sleeve; 9 5. Threaded disk; 96. First guide rod; 10. Coil cleaning assembly; 101. Fixed disk; 102. Rotating sleeve; 103. Spiral scraper; 104. Docking rod; 105. Guide ball; 106. Guide sleeve; 107. Spiral groove; 11. Hot air inlet pipe; 12. Cold air outlet pipe; 13. First cold medium inlet pipe; 14. First hot medium outlet pipe; 15. Second cold medium inlet pipe; 16. Second hot medium outlet pipe; 17. Linear bearing; 18. Second guide rod. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] Reference Figures 1-12, Example 1, a waste heat utilization device of a tubular furnace, comprising a heat exchange tank 1, one end of the interior of the heat exchange tank 1 is provided with a main heat exchange coil 2, and the other end of the interior of the heat exchange tank 1 is provided with an auxiliary heat exchange coil 3, the interior of the heat exchange tank 1 is penetrated by a guide component 4 on the outer wall of the main heat exchange coil 2 and the auxiliary heat exchange coil 3, and the guide component 4 comprises a fixed heat exchange plate 41, a movable heat exchange plate 42 and a deflection baffle 43, wherein the fixed heat exchange plate 41 is fixedly connected to the inner wall of one end of the heat exchange tank 1, the movable heat exchange plate 42 is provided on the inner wall of the other end of the heat exchange tank 1, and the deflection baffle 43 is distributed between the fixed heat exchange plate 41 and the movable heat exchange plate 42, the movable heat exchange plate 42 is screwed on the outer wall of the passive main shaft 6, and the fixed heat exchange plate 41 and the deflection baffle 43 are both slidably connected to the outer wall of the passive main shaft 6.

[0039] Heat exchange tank 1 houses the primary and secondary heat exchange coils 2 and 3. The fixed heat exchange plate 41 of the flow guide assembly 4 is welded to the inner wall of one end of the heat exchange tank 1. The movable heat exchange plate 42 is threadedly connected to the passive spindle 6 via a threaded groove. The baffle 43 is slidably connected to the outer wall of the passive spindle 6. When the passive spindle 6 rotates, the movable heat exchange plate 42 moves axially due to the threaded engagement, while the baffle 43 is constrained by the connecting rod assembly 5 to move synchronously.

[0040] In this embodiment, the rotation of the passive main shaft 6 is controlled by the limited drive assembly 9, and the movable heat exchange plate 42 is driven to move axially along the passive main shaft 6 under the mutual engagement of the first bevel gear 7 and the second bevel gear 8. Moreover, under the linkage of the connecting rod assembly 5, the gaps between the movable heat exchange plate 42, the deflection baffle 43 and the fixed heat exchange plate 41 can be changed synchronously, and the heat exchange intensity can be dynamically adjusted, which helps to improve energy utilization.

[0041] In the second embodiment, a connecting rod assembly 5 is provided on the top outer wall of the guide assembly 4, a passive main shaft 6 is rotatably connected to the inner wall of one end of the heat exchange tank 1, and a first bevel gear 7 is welded to the outer wall of one end of the passive main shaft 6, a second bevel gear 8 is meshed on the outer wall of the first bevel gear 7, and a limited position drive assembly 9 is provided on the outer wall of one side of the second bevel gear 8;

[0042] The connecting rod assembly 5 includes a column 51, a lower connecting rod 52, an upper connecting rod 53 and an axle pin 54. The outer walls of the tops of the fixed heat exchange plate 41, the movable heat exchange plate 42 and the baffle 43 are all provided with grooves, and the column 51 is fixedly connected to the bottom inner wall of the groove. The lower connecting rod 52 and the upper connecting rod 53 are both rotatably connected to the outer wall of the column 51. The axle pin 54 is fixedly connected to the inner walls at both ends of the lower connecting rod 52, and the axle pin 54 is slidably connected to the inner walls at both ends of the upper connecting rod 53. The lower connecting rod 52 and the upper connecting rod 53 are alternately distributed on the top of the inner wall of the heat exchange tank 1 in sequence.

[0043] The limiting drive assembly 9 includes a driving screw 91, a limiting plate 92 for limiting the maximum gap of the guide assembly 4, a mounting plate 93, a limiting sleeve 94 for limiting the minimum gap of the guide assembly 4, and a threaded disk 95, wherein the driving screw 91 is welded to the outer wall of one side of the second bevel gear 8, and the driving screw 91 is rotatably connected to the inner wall of the heat exchange tank 1 through a bearing, the limiting plate 92 is welded to the outer wall of the driving screw 91, and the limiting plate 92 is located outside the heat exchange tank 1, and the mounting plate 93 is fixedly connected to the heat exchange tank 1 by screws. On one side outer wall, the limiting sleeve 94 is welded to one side outer wall of the mounting plate 93, and the driving screw 91 is arranged inside the limiting sleeve 94, the threaded disk 95 is screwed on the outer wall of the driving screw 91, and the threaded disk 95 is located between the limiting plate 92 and the limiting sleeve 94, the limiting drive assembly 9 also includes a first guide rod 96 symmetrically distributed on both sides of the limiting sleeve 94, the outer wall of one end of the first guide rod 96 is fixedly connected to the outer wall of one side of the mounting plate 93, and the first guide rod 96 is slidably connected to the inner walls of both ends of the threaded disk 95.

[0044] In the connecting rod assembly 5, the lower connecting rod 52 and the upper connecting rod 53 are hinged via a pin 54 and rotate around the column 51. When the movable heat exchange plate 42 moves, the corresponding connecting rod at the top of the movable heat exchange plate 42 pulls the corresponding connecting rod of the adjacent baffle 43, forming a "folding accordion" effect, ensuring that the gaps between all fixed heat exchange plates 41, movable heat exchange plates 42, and baffles 43 change evenly. The drive screw 91 of the limited drive assembly 9 is welded to the second bevel gear 8. When the drive screw 91 rotates, it pushes the threaded disk 95 to slide along the first guide rod 96.

[0045] Among them, the limiting logic is: when the threaded disk 95 contacts the limiting sleeve 94, the gap of the guide assembly 4 is the smallest; when the threaded disk 95 contacts the limiting plate 92, the gap of the guide assembly 4 is the largest. By physically limiting the stroke of the threaded disk 95 through the limiting plate 92 and the limiting sleeve 94, it is possible to avoid the gap of the guide assembly 4 exceeding the limit and causing the connecting rod assembly 5 to be stuck.

[0046] In this embodiment, by rotating the driving screw 91 to make the threaded disk 95 close to the limit sleeve 94, the movable heat exchange plate 42 can move toward the side of the main heat exchange coil 2, so that the gap of the guide component 4 is reduced to the minimum design value, forcing more exhaust gas to be diverted to flush the main heat exchange coil 2, significantly improving its heat exchange efficiency. When the driving screw 91 is rotated in the reverse direction to make the threaded disk 95 close to the limit plate 92, the gap of the guide component 4 can be controlled to expand to the maximum value, reducing the exhaust gas flow rate contacted by the main heat exchange coil 2, and the remaining heat can be heat exchanged with the auxiliary heat exchange coil 3, thereby realizing precise control of the medium temperature and avoiding energy waste.

[0047] In the third embodiment, a coil cleaning assembly 10 is provided on the outer wall of the main heat exchange coil 2 and the auxiliary heat exchange coil 3. The coil cleaning assembly 10 includes a fixed plate 101, a rotating sleeve 102, a spiral scraper 103, a docking rod 104, a guide ball 105, a guide sleeve 106 and a spiral groove 107. The fixed plate 101 is welded to the outer wall of one side of the movable heat exchange plate 42 and the baffle 43, and the guide sleeve 106 is welded to the outer wall of the other side of the fixed heat exchange plate 41 and the baffle 43. The rotating sleeve 102 is rotatably connected to the inner wall of one side of the fixed disk 101, the spiral scraper 103 is welded to the outer wall of one side of the rotating sleeve 102, and the spiral scraper 103 is closely attached to the outer walls of the main heat exchange coil 2 and the auxiliary heat exchange coil 3. The docking rod 104 is welded to the top outer wall of the rotating sleeve 102, and the guide ball 105 is welded to the outer wall of one end of the docking rod 104. The spiral groove 107 is opened on the outer wall of the guide sleeve 106, and the guide ball 105 is slidably connected to the inner wall of the spiral groove 107;

[0048] The fixed plate 101 is arranged on one side of the guide sleeve 106 , and the coil cleaning assembly 10 is located between two adjacent fixed heat exchange plates 41 and deflection baffles 43 , deflection baffles 43 and deflection baffles 43 , and deflection baffles 43 and deflection baffles 43 .

[0049] The fixed plate 101 of the coil cleaning assembly 10 is welded to the outer walls of the movable heat exchange plate 42 and the deflector baffle 43, and the guide sleeve 106 is welded to the outer walls of the fixed heat exchange plate 41 and the deflector baffle 43. When the spacing between the fixed heat exchange plate 41, the movable heat exchange plate 42 and the deflector baffle 43 changes, the guide ball 105 will slide along the path of the spiral groove 107, thereby driving the rotating sleeve 102 to drive the spiral scraper 103 to rotate. The spiral scraper 103 adopts a multi-turn design to cover the outer walls of the main heat exchange coil 2 and the auxiliary heat exchange coil 3, achieving 360° scraping.

[0050] In this embodiment, when the flow guide assembly 4 moves, relative displacement occurs between the fixed disk 101 and the guide sleeve 106, forcing the guide balls 105 to slide along the spiral grooves 107, thereby driving the rotation of the rotating sleeve 102 and the spiral scraper 103. Because the spiral scraper 103 closely adheres to the outer walls of the primary and secondary heat exchange coils 2 and 3, dynamic cleaning of the coils is achieved. The coil cleaning assembly 10 is mechanically linked with the flow guide assembly 4, the connecting rod assembly 5, and the limited drive assembly 9, eliminating the need for additional power, reducing dust accumulation on the coil surfaces, and helping to maintain long-term heat transfer efficiency.

[0051] A hot air inlet pipe 11 is installed on the outer wall of one end of the heat exchange tank 1, and a cold air outlet pipe 12 is installed on the other end of the outer wall of one side of the heat exchange tank 1.

[0052] The outer wall of one end of the main heat exchange coil 2 is fixedly connected to the first cold medium inlet pipe 13 via a flange, and the outer wall of the other end of the main heat exchange coil 2 is fixedly connected to the first hot medium outlet pipe 14 via a flange. The outer wall of one end of the auxiliary heat exchange coil 3 is fixedly connected to the second cold medium inlet pipe 15 via a flange, and the outer wall of the other end of the auxiliary heat exchange coil 3 is fixedly connected to the second hot medium outlet pipe 16 via a flange.

[0053] Exhaust gas flow: High-temperature exhaust gas enters the heat exchange tank 1 through the hot air inlet pipe 11, and then is continuously deflected back and forth under the action of the guide component 4. The high-temperature exhaust gas exchanges heat with the low-temperature medium inside the main heat exchange coil 2 and the auxiliary heat exchange coil 3, so that the high-temperature exhaust gas is cooled, and finally the low-temperature exhaust gas is discharged through the cold air outlet pipe 12.

[0054] Medium flow: The cold medium enters the main heat exchange coil 2 and the auxiliary heat exchange coil 3 through the first cold medium inlet pipe 13 and the second cold medium inlet pipe 15 respectively. After absorbing heat, the cold medium is discharged through the first heat medium outlet pipe 14 and the second heat medium outlet pipe 16 respectively.

[0055] Linear bearings 17 are installed on the inner walls of the fixed heat exchange plate 41, the movable heat exchange plate 42 and the deflection baffle 43, and the inner wall of the linear bearing 17 is slidably connected to the second guide rod 18. The outer walls of both ends of the second guide rod 18 are respectively welded to the inner walls of both ends of the heat exchange tank 1.

[0056] The second guide rod 18 passes through the linear bearing 17 to ensure that the guide assembly 4 moves without deflection; the first guide rod 96 constrains the threaded disk 95 to move only along the axial direction of the driving screw rod 91 to prevent the driving screw rod 91 from bending under force.

[0057] Working principle:

[0058] 1. Waste heat recovery process:

[0059] The high-temperature exhaust gas from the tubular furnace enters the heat exchange tank 1 through the hot air inlet pipe 11. Then, guided by the fixed heat exchange plates 41, movable heat exchange plates 42, and baffles 43 of the flow guide assembly 4, it forms an "S"-shaped path, fully flushing the outer tube walls of the main heat exchange coil 2 and the auxiliary heat exchange coil 3. The cold medium flows into the main heat exchange coil 2 and the auxiliary heat exchange coil 3 through the first cold medium inlet pipe 13 and the second cold medium inlet pipe 15, respectively. After absorbing the heat of the exhaust gas, it becomes hot medium and is discharged through the first hot medium outlet pipe 14 and the second hot medium outlet pipe 16. Finally, the cooled exhaust gas is discharged through the cold air outlet pipe 12.

[0060] 2. Heat exchange intensity adjustment:

[0061] Enhanced heat exchange: If it is necessary to increase the temperature of the medium in the main heat exchange coil 2, the screw 91 is rotated to make the threaded disk 95 gradually approach the limit sleeve 94. At this time, the second bevel gear 8 will drive the first bevel gear 7 to rotate, thereby controlling the rotation of the passive main shaft 6. At this time, the movable heat exchange plate 42 will move toward the direction of the main heat exchange coil 2, the connecting rod assembly 5 will passively contract, the gap of the guide assembly 4 will gradually narrow, and the exhaust gas will flow through the main heat exchange coil 2 in a concentrated manner.

[0062] Weakening heat exchange: If it is necessary to lower the temperature of the medium in the main heat exchange coil 2, the screw 91 can be rotated in the opposite direction until the threaded disk 95 gradually contacts the limit plate 92. At this time, the movable heat exchange plate 42 moves away from the main heat exchange coil 2, and the gap of the deflection baffle 43 gradually expands, diverting the exhaust gas to the auxiliary heat exchange coil 3 area.

[0063] 3. Synchronous self-cleaning:

[0064] When the guide assembly 4 moves, the fixed disk 101 and the guide sleeve 106 will gradually produce relative displacement, and the guide ball 105 will slide along the path of the spiral groove 107, forcing the rotating sleeve 102 to drive the spiral scraper 103 to rotate, thereby scraping off the dust accumulated on the outer walls of the main heat exchange coil 2 and the auxiliary heat exchange coil 3. The cleaning action is fully automatic and there is no need to interrupt the heat exchange operation.

[0065] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A waste heat utilization device for a tubular furnace, comprising a heat exchange tank (1), characterized in that: A main heat exchange coil (2) is provided at one end of the interior of the heat exchange tank (1), and an auxiliary heat exchange coil (3) is provided at the other end of the interior of the heat exchange tank (1). A flow guide assembly (4) is provided on the outer wall of the main heat exchange coil (2) and the auxiliary heat exchange coil (3) inside the heat exchange tank (1), and the flow guide assembly (4) includes a fixed heat exchange plate (41), a movable heat exchange plate (42) and a deflection baffle (43), wherein the fixed heat exchange plate (41) is fixedly connected to the inner wall of one end of the heat exchange tank (1), the movable heat exchange plate (42) is provided on the inner wall of the other end of the heat exchange tank (1), and the deflection baffle (43) is distributed between the fixed heat exchange plate (41) and the movable heat exchange plate (42); A connecting rod assembly (5) is provided on the top outer wall of the guide assembly (4); a passive main shaft (6) is rotatably connected to the inner wall of one end of the heat exchange tank (1); a first bevel gear (7) is welded to the outer wall of one end of the passive main shaft (6); a second bevel gear (8) is meshed on the outer wall of the first bevel gear (7); and a limited driving assembly (9) is provided on the outer wall of one side of the second bevel gear (8); and a coil cleaning assembly (10) is provided on the outer walls of the main heat exchange coil (2) and the auxiliary heat exchange coil (3); The coil cleaning assembly (10) comprises a fixed disk (101), a rotating sleeve (102), a spiral scraper (103), a docking rod (104), a guide ball (105), a guide sleeve (106) and a spiral groove (107), wherein the fixed disk (101) is welded to the outer wall of one side of the movable heat exchange plate (42) and the baffle (43), the guide sleeve (106) is welded to the outer wall of the other side of the fixed heat exchange plate (41) and the baffle (43), and the rotating sleeve (102) is rotatably connected to the fixed disk (101). 01), a spiral scraper (103) is welded to an outer wall of one side of the rotating sleeve (102), and the spiral scraper (103) is closely attached to the outer walls of the main heat exchange coil (2) and the auxiliary heat exchange coil (3), a docking rod (104) is welded to the top outer wall of the rotating sleeve (102), a guide ball (105) is welded to the outer wall of one end of the docking rod (104), a spiral groove (107) is opened on the outer wall of the guide sleeve (106), and the guide ball (105) is slidably connected to the inner wall of the spiral groove (107); The fixed plate (101) is arranged on one side of the guide sleeve (106), and the coil cleaning assembly (10) is located between two adjacent fixed heat exchange plates (41) and deflection baffles (43), between the deflection baffles (43) and the deflection baffles (43), and between the deflection baffles (43) and the deflection baffles (43).

2. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: The connecting rod assembly (5) includes a column (51), a lower connecting rod (52), an upper connecting rod (53) and an axle pin (54); the top outer walls of the fixed heat exchange plate (41), the movable heat exchange plate (42) and the baffle (43) are all provided with grooves, and the column (51) is fixedly connected to the bottom inner wall of the groove; the lower connecting rod (52) and the upper connecting rod (53) are both rotatably connected to the outer wall of the column (51); the axle pin (54) is fixedly connected to the inner walls of both ends of the lower connecting rod (52), and the axle pin (54) is slidably connected to the inner walls of both ends of the upper connecting rod (53); wherein the lower connecting rod (52) and the upper connecting rod (53) are alternately distributed in sequence on the top of the inner wall of the heat exchange tank (1).

3. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: The movable heat exchange plate (42) is screwed onto the outer wall of the passive main shaft (6), and the fixed heat exchange plate (41) and the deflection baffle (43) are both slidably connected to the outer wall of the passive main shaft (6).

4. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: The limiting drive assembly (9) comprises a driving screw (91), a limiting plate (92) for limiting the maximum gap of the guide assembly (4), a mounting plate (93), a limiting sleeve (94) for limiting the minimum gap of the guide assembly (4), and a threaded disk (95), wherein the driving screw (91) is welded to the outer wall of one side of the second bevel gear (8), and the driving screw (91) is rotatably connected to the inner wall of the heat exchange tank (1) through a bearing, and the limiting plate (92) is welded to the driving screw. The rod (91) is mounted on an outer wall of the rod, and the limiting plate (92) is located outside the heat exchange tank (1). The mounting plate (93) is fixedly connected to the outer wall of one side of the heat exchange tank (1) by screws. The limiting sleeve (94) is welded to the outer wall of one side of the mounting plate (93). The driving screw rod (91) is passed through the interior of the limiting sleeve (94). The threaded disc (95) is screwed on the outer wall of the driving screw rod (91), and the threaded disc (95) is located between the limiting plate (92) and the limiting sleeve (94).

5. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: The limiting drive assembly (9) further includes a first guide rod (96) symmetrically distributed on both sides of the limiting sleeve (94), wherein an outer wall of one end of the first guide rod (96) is fixedly connected to an outer wall of one side of the mounting plate (93), and the first guide rod (96) is slidably connected to the inner walls of both ends of the threaded disk (95).

6. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: A hot air inlet pipe (11) is installed on the outer wall of one end of the heat exchange tank (1), and a cold air outlet pipe (12) is installed on the other end of the outer wall of one side of the heat exchange tank (1).

7. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: The outer wall of one end of the main heat exchange coil (2) is fixedly connected to a first cold medium inlet pipe (13) via a flange, and the outer wall of the other end of the main heat exchange coil (2) is fixedly connected to a first hot medium outlet pipe (14) via a flange.

8. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: The outer wall of one end of the auxiliary heat exchange coil (3) is fixedly connected to a second cold medium inlet pipe (15) via a flange, and the outer wall of the other end of the auxiliary heat exchange coil (3) is fixedly connected to a second hot medium outlet pipe (16) via a flange.

9. The waste heat utilization device of a tubular furnace according to claim 1, characterized in that: Linear bearings (17) are installed on the inner walls of the fixed heat exchange plate (41), the movable heat exchange plate (42) and the baffle (43), and the inner walls of the linear bearings (17) are slidably connected to second guide rods (18), and the outer walls at both ends of the second guide rods (18) are respectively welded to the inner walls at both ends of the heat exchange tank (1).

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