A roasting furnace waste heat recovery device

Abstract

The application belongs to the technical field of waste heat recovery, and discloses a roasting furnace waste heat recovery device, which comprises a treatment box and further comprises: a heat exchange assembly installed in the inside of the treatment box; and a slag discharge pipe arranged at the bottom of the treatment box. Water enters through the lower end of the heat exchange pipe, and roasting furnace waste gas moves downward along the heat exchange pipe in a spiral manner. Since the heat exchange pipe is made of metal material, flue gas contacts the surface of the heat exchange pipe, so that the purpose of waste heat recovery of flue gas is achieved. Since water enters through the lower end of the heat exchange pipe, and roasting furnace waste gas enters the top of the treatment box from the smoke inlet pipe and moves downward along the heat exchange pipe, the temperature continuously decreases during the downward movement of the waste gas, so that the effect of waste heat recovery of roasting furnace waste gas is improved. In this process, the contact area of the roasting furnace waste gas and the heat exchange pipe is increased by the spiral arrangement of the heat exchange pipe, so that the efficiency of waste heat recovery is ensured, and meanwhile, the arrangement of the heat exchange pipe is prevented from being too dense, so that the discharge of the roasting furnace waste gas is ensured.

Description

Technical Field

[0001] This invention belongs to the field of waste heat recovery technology, specifically a waste heat recovery device for a roasting furnace. Background Technology

[0002] A roasting furnace is an industrial heat treatment device mainly used for roasting ores, metal compounds, ceramic materials, or other solid raw materials under high-temperature conditions. Roasting furnace waste heat recovery refers to the efficient collection and reuse of high-temperature waste gas, radiant heat, or waste heat from cooling media generated during the roasting process through systematic technology. This aims to improve energy efficiency, reduce production costs, and reduce environmental thermal pollution. The core of this process is to convert the waste heat that would otherwise be emitted into the environment into usable secondary energy, such as steam, electricity, or preheated combustion air.

[0003] Currently, the exhaust gas emitted during the operation of roasting furnaces contains a large amount of heat energy. In order to fully realize the efficient utilization of resources, it is usually necessary to recover the waste heat of the exhaust gas. Existing waste heat recovery systems mostly use heat exchange equipment, whose internal heat exchange tubes are usually designed with a spiral or serpentine structure. When high-temperature exhaust gas enters the heat exchange equipment, it comes into contact with the spiral or serpentine heat exchange tubes, and the heat is conducted to the circulating water medium inside the tubes, thereby realizing waste heat recovery. However, in this process, due to the spiral or serpentine arrangement of the heat exchange tubes, the exhaust gas is difficult to fully contact the surface of the heat exchange tubes when flowing through the heat exchange equipment, which leads to limited heat exchange efficiency and affects the energy recovery effect. In addition, if the heat exchange tubes are arranged too densely, it may also affect the normal flow and emission efficiency of the exhaust gas. Therefore, a waste heat recovery device for roasting furnaces is proposed. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention provides a waste heat recovery device for a roasting furnace, which solves the problem that existing waste heat recovery devices for roasting furnaces typically use spiral or serpentine heat exchange tube structures, but the heat exchange efficiency is limited due to insufficient contact between the waste gas and the heat exchange tubes, thus affecting the energy recovery effect.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a waste heat recovery device for a roasting furnace, comprising a processing box, and further comprising: A heat exchange assembly, which is installed inside the processing chamber; A slag discharge pipe is located at the bottom of the processing tank; The outside of the slag discharge pipe is provided with a smoke exhaust pipe, and the top of the treatment box is provided with a smoke inlet pipe; The heat exchange assembly includes a cross support frame fixedly installed at both ends inside the processing box, a support spindle fixedly installed in the middle of the two cross support frames, and a heat exchange tube fixedly installed on the outside of the support spindle. The heat exchange tube is made of metal and is spiral-shaped, with both ends extending to the outside of the processing box. Water enters the waste heat absorption furnace through the lower end of the heat exchange tube and is discharged through the upper end of the heat exchange tube. The exhaust gas from the roasting furnace enters the treatment box through the flue pipe and moves along the heat exchange tubes to achieve heat exchange.

[0006] Preferably, the processing box is provided with a protective component inside, the protective component including a first transmission gear movably sleeved inside the processing box, and a support member is fixedly mounted on the bottom of the first transmission gear through a docking frame; The support member is a ring-shaped rod composed of two straight rods and two curved rods.

[0007] Preferably, a first arc-shaped guard plate and a second arc-shaped guard plate are symmetrically and movably sleeved on the straight rod of the support member. Both ends of the straight rod of the support member are fixedly fitted with a connecting plate. The connecting plate is provided with a reset elastic element that supports the first arc-shaped guard plate and the second arc-shaped guard plate relative to each other, so that the first arc-shaped guard plate and the second arc-shaped guard plate form a circular tube.

[0008] Preferably, the first arc-shaped guard plate and the second arc-shaped guard plate form a circular tube inside the processing box, and the inner wall of the circular tube is in contact with the outer periphery of the heat exchange tube; The lower end of the processing box is movably fitted with a lower support ring, and the circular tube is located between the first transmission gear and the lower support ring; The exhaust gas from the roasting furnace enters the treatment box through the flue pipe, and is guided by the circular pipe to move along the heat exchange tube.

[0009] Preferably, the processing box is provided with a driving assembly, which includes a guide plate fixed to the outside of the first arc-shaped guard plate and the second arc-shaped guard plate. The distance between the guide plate and the ends of the first arc-shaped guard plate and the second arc-shaped guard plate gradually decreases from top to bottom.

[0010] Preferably, a driving component is provided on the outside of the processing box, a connecting component is assembled at the output end of the driving component, a transmission frame is movably sleeved on the inner wall of the connecting component, and a transmission rod and a contacting push component are connected to the inner wall of the transmission frame through a connecting ear.

[0011] Preferably, the abutting pusher is attached to the inner wall of the guide plate, and the bottom of the abutting pusher and one corner attached to the guide plate are rounded. The driving component pushes the connecting component and the abutting component to move down along the inner wall of the guide plate. Through the cooperation of the abutting component and the guide plate, the first arc-shaped guard plate and the second arc-shaped guard plate move to both ends along the straight rod of the support component.

[0012] Preferably, the protective assembly further includes grooves formed on the first arc-shaped guard plate and the second arc-shaped guard plate, and the first transmission gear and the lower support ring are connected by a guide rod; The guide rod has a sleeve that slides through a vertical guide groove on its outside, and a sliding component located in the groove is fixedly installed on the outside of the sleeve. When the first arc-shaped guard plate and the second arc-shaped guard plate initially form a circular tube, the sliding member is located inside the groove, so that the inner wall of the circular tube contacts the heat exchange tube.

[0013] Preferably, the end of the sliding member is fixedly fitted with a cleaning member that fits onto the heat exchange tube, the interior of the processing box is provided with a second transmission gear that meshes with the first transmission gear, and the exterior of the processing box is provided with a motor for driving the second transmission gear and the first transmission gear to rotate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, water enters through the lower end of the heat exchange tube, and the exhaust gas from the roasting furnace moves spirally downward along the heat exchange tube. Since the heat exchange tube is made of metal, the flue gas comes into contact with the surface of the heat exchange tube, and the heat of the flue gas is transferred to the water through the heat exchange tube, thus achieving the purpose of recovering the waste heat of the flue gas. Because water enters through the lower end of the heat exchange tube, and the exhaust gas from the roasting furnace enters from the top of the treatment box through the flue gas inlet pipe and moves downward along the heat exchange tube, the temperature of the exhaust gas continues to decrease during the downward movement, improving the effect of recovering the waste heat of the roasting furnace exhaust gas. In this process, the spiral arrangement of the heat exchange tube increases the contact area between the exhaust gas from the roasting furnace and the heat exchange tube, ensuring the efficiency of waste heat recovery, while avoiding the heat exchange tubes being arranged too densely, thereby ensuring the discharge of the exhaust gas from the roasting furnace. This invention uses a drive assembly to push the inner walls of the first and second arc-shaped guard plates away from the outside of the heat exchange tube. A guide rod drives a sliding component and a cleaning component, causing the cleaning component to move along the outside of the heat exchange tube around a support spindle as its central axis, while simultaneously moving vertically downwards along the guide rod. This improves the stability of the cleaning component's operation. The movement of the heat exchange tube scrapes away the dirt adhering to its surface, thereby improving the waste heat transfer efficiency of the exhaust gas. This reciprocating motion cleans the surface of the heat exchange tube. Furthermore, a cleaning agent can be injected into the treatment chamber through the flue gas inlet pipe. The cleaning agent moves along the heat exchange tube and, in conjunction with the cleaning component, enhances the dirt removal effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the processing box of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the external structure of the heat exchange component of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the heat exchange component, drive component and protection component of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the combined structure of the heat exchange component and the protection component of the present invention; Figure 8 This is a schematic diagram of the structure of the heat exchange component and the processing box of the present invention. Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C; Figure 10 This is a schematic diagram of the external structure of the driving component and the protective component of the present invention; Figure 11 This is a schematic diagram of the disassembled structure of the protective component of the present invention; Figure 12 This is a schematic diagram of the cooperative structure of the driving component and the protective component of the present invention; Figure 13 This is a schematic diagram of the disassembled structure of the protective component of the present invention.

[0016] In the diagram: 1. Processing box; 2. Smoke inlet pipe; 3. Slag discharge pipe; 4. Smoke discharge pipe; 5. Heat exchange assembly; 51. Heat exchange tube; 52. Support spindle; 53. Cross support frame; 6. Drive assembly; 61. Drive component; 62. Connecting component; 63. Transmission frame; 64. Transmission rod; 65. Abutting and pushing component; 66. Guide plate; 67. Connecting ear; 7. Protective assembly; 71. First arc-shaped guard plate; 72. Support component; 73. Guide rod; 74. Vertical guide groove; 75. Second arc-shaped guard plate; 76. First transmission gear; 77. Second transmission gear; 78. Lower support ring; 711. Docking frame; 712. Docking plate; 713. Reset elastic component; 714. Groove; 721. Sleeve; 722. Sliding component; 723. Cleaning component. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 13 As shown, the present invention provides a waste heat recovery device for a roasting furnace, including a processing box 1, and further comprising: Heat exchange component 5 is installed inside the processing box 1; Slag discharge pipe 3 is located at the bottom of the processing box 1; The outside of the slag discharge pipe 3 is provided with a smoke exhaust pipe 4, and the top of the treatment box 1 is provided with a smoke inlet pipe 2; The heat exchange assembly 5 includes a cross support frame 53 fixedly installed at both ends inside the processing box 1. A support spindle 52 is fixedly installed in the middle of the two cross support frames 53, and a heat exchange tube 51 is fixedly installed on the outside of the support spindle 52. The heat exchange tube 51 is made of metal and is spiral in shape. Both ends of the heat exchange tube 51 extend to the outside of the processing box 1. Water enters the waste heat of the calcining furnace through the lower end of heat exchange tube 51 and is then discharged through the upper end of heat exchange tube 51. The exhaust gas from the roasting furnace enters the treatment box 1 through the flue pipe 2 and moves along the heat exchange tube 51 to achieve heat exchange.

[0019] The initial flue gas inlet pipe 2 is connected to the exhaust pipe of the roasting furnace, and the slag discharge pipe 3 is in a closed state. The exhaust gas generated by the roasting furnace enters the treatment box 1 through the flue gas inlet pipe 2. Water enters through the lower end of the heat exchange tube 51. The exhaust gas from the roasting furnace moves spirally downward along the heat exchange tube 51. Since the heat exchange tube 51 is made of metal, the flue gas contacts the surface of the heat exchange tube 51, and the heat of the exhaust gas is transferred to the water through the heat exchange tube 51. The exhaust gas is then discharged through the exhaust pipe 4 for treatment, thus achieving the purpose of recovering waste heat from the flue gas. Since the water enters through the lower end of the heat exchange tube 51, and the exhaust gas from the roasting furnace enters the top of the treatment box 1 from the flue gas inlet pipe 2 and moves downward along the heat exchange tube 51, the temperature of the exhaust gas continues to decrease during the downward movement, improving the effect of recovering waste heat from the roasting furnace exhaust gas. During this process, the spiral arrangement of the heat exchange tube 51 increases the contact area between the exhaust gas from the roasting furnace and the heat exchange tube 51, ensuring the efficiency of waste heat recovery, while avoiding the heat exchange tubes from being arranged too densely, thereby ensuring the discharge of exhaust gas from the roasting furnace.

[0020] like Figures 9-13 As shown, a protective component 7 is provided inside the processing box 1. The protective component 7 includes a first transmission gear 76 that is movably sleeved inside the processing box 1. A support member 72 is fixedly mounted on the bottom of the first transmission gear 76 through a docking frame 711. The support member 72 is a ring-shaped rod composed of two straight rods and two curved rods; The support member 72 has a first arc-shaped guard plate 71 and a second arc-shaped guard plate 75 symmetrically and movably sleeved on its straight rod. Both ends of the support member 72 are fixedly fitted with a connecting plate 712. The connecting plate 712 is provided with a reset elastic member 713 that supports the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 relative to each other, so that the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 form a circular tube. The first arc-shaped protective plate 71 and the second arc-shaped protective plate 75 form a circular tube inside the processing box 1, and the inner wall of the circular tube is in contact with the outer periphery of the heat exchange tube 51. The lower end of the processing box 1 is movably fitted with a lower support ring 78, and the round tube is located between the first transmission gear 76 and the lower support ring 78. The exhaust gas from the roasting furnace enters the treatment box 1 through the flue pipe 2, and is guided by the round pipe to move along the heat exchange tube 51.

[0021] The exhaust gas generated during the operation of the roasting furnace is introduced into the interior of the treatment box 1 through the flue pipe 2. Initially, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 slide on the straight rod of the support member 72 under the action of the reset elastic member 713 to form a circular tube. The circular tube is sleeved on the outside of the heat exchange tube 51. The exhaust gas from the roasting furnace is guided by the circular tube to spiral down along the heat exchange tube 51 inside the treatment box 1, and the heat is transferred to the water through the heat exchange tube 51 to achieve the purpose of waste heat recovery.

[0022] like Figure 6 , Figure 10 and Figure 12 As shown, the interior of the processing box 1 is provided with a drive assembly 6. The drive assembly 6 includes a guide plate 66 fixed to the outside of the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75. The distance between the guide plate 66 and the ends of the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 gradually decreases from top to bottom. The processing box 1 is provided with a drive unit 61 on the outside. The output end of the drive unit 61 is equipped with a connector 62. The inner wall of the connector 62 is movably fitted with a transmission frame 63. The inner wall of the transmission frame 63 is connected to a transmission rod 64 and a contacting pusher 65 through a connecting ear 67. The abutting pusher 65 is attached to the inner wall of the guide plate 66, and the bottom of the abutting pusher 65 and one corner of the guide plate 66 are rounded. The driving component 61 pushes the connecting component 62 and the abutting pusher 65 to move down along the inner wall of the guide plate 66. Through the cooperation of the abutting pusher 65 and the guide plate 66, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 move to both ends along the straight rod of the support component 72.

[0023] The initial contact pusher 65 is located at the upper end of the guide plate 66. The first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 are attached to each other to form a circular tube under the action of the reset elastic member 713. The drive member 61 pushes the connector 62, transmission frame 63, connecting ear 67, transmission rod 64 and contact pusher 65 to move downward. During the downward movement, the contact pusher 65 cooperates with the guide plate 66 to push the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 to move along the straight rod of the support member 72 to both ends and compress the reset elastic member 713, so that the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 are separated from each other and simultaneously separated from the external contact of the heat exchange tube 51.

[0024] like Figure 2 , Figure 3 and Figure 7-13As shown, the protective component 7 also includes grooves 714 formed on the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75, and the first transmission gear 76 and the lower support ring 78 are connected by a guide rod 73. A sleeve 721 is slidably attached to the outside of the guide rod 73 via a vertical guide groove 74, and a sliding member 722 located in a groove 714 is fixedly mounted on the outside of the sleeve 721. When the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 initially form a circular tube, the sliding member 722 is located inside the groove 714, so that the inner wall of the circular tube contacts the heat exchange tube 51. The end of the sliding member 722 is fixedly fitted with a cleaning member 723 that fits onto the heat exchange tube 51. The inside of the processing box 1 is provided with a second transmission gear 77 that meshes with the first transmission gear 76. The outside of the processing box 1 is provided with a motor for driving the second transmission gear 77 and the first transmission gear 76 to rotate.

[0025] Driven by the drive unit 61, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 move towards both ends along the straight rod of the support member 72, disengaging from each other. At the same time, the inner walls of the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 disengage from the outside of the heat exchange tube 51, and the sliding member 722 disengages from the inside of the groove 714. At this time, the motor drives the second transmission gear 77, the first transmission gear 76, the guide rod 73 and the lower support ring 78 to rotate. The first transmission gear 76 and the lower support ring 78 drive the support member 72, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 to move synchronously through the docking frame 711. Furthermore, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 drive the guide plate 66, the transmission rod 64, the connecting ear 67 and the transmission frame 63 to rotate along the inner wall of the connecting member 62. The guide rod 73 drives the sliding part 722 and the cleaning part 723, so that the cleaning part 723 moves along the outside of the heat exchange tube 51 with the support spindle 52 as the central axis, and moves vertically downward along the guide rod 73 to improve the stability of the operation of the cleaning part 723. The movement of the heat exchange tube 51 scrapes off the dirt attached to the surface of the heat exchange tube 51, thereby improving the waste heat transfer efficiency of the exhaust gas. This reciprocating motion cleans the surface of the heat exchange tube 51. Furthermore, the cleaning agent can be injected into the treatment box 1 through the flue pipe 2. The cleaning agent moves along the heat exchange tube 51 and works with the cleaning part 723 to improve the dirt removal effect. The cleaned dirt is discharged through the slag discharge pipe 3. After cleaning, the cleaning component 723 and the sliding component 722 are reset, and the driving component 61 drives the resisting pushing component 65 to move in the opposite direction. At this time, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 move relative to each other under the action of the reset elastic component 713 to form a circular tube sleeved on the outside of the heat exchange tube 51, so that the waste heat recovery treatment of the roasting furnace exhaust gas can continue.

[0026] Working principle and usage process of this invention: The exhaust gas generated during the operation of the roasting furnace is introduced into the interior of the treatment box 1 through the flue pipe 2. Initially, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 slide on the straight rod of the support member 72 under the action of the reset elastic member 713 to form a circular tube, and the circular tube is sleeved on the outside of the heat exchange tube 51. The exhaust gas from the roasting furnace moves spirally downward along the heat exchange tube 51. Since the heat exchange tube 51 is made of metal, the flue gas contacts the surface of the heat exchange tube 51, and the heat of the exhaust gas is transferred to the water through the heat exchange tube 51. The exhaust gas is then discharged through the exhaust pipe 4 for treatment, thereby achieving the purpose of recovering the waste heat of the flue gas. In this process, the spiral arrangement of the heat exchange tube 51 increases the contact area between the exhaust gas from the roasting furnace and the heat exchange tube 51, ensuring the efficiency of waste heat recovery, while avoiding the heat exchange tubes from being arranged too densely, thus ensuring the discharge of the exhaust gas from the roasting furnace. Driven by the drive unit 61, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 move towards both ends along the straight rod of the support member 72, disengaging from each other. At the same time, the inner walls of the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 disengage from the outside of the heat exchange tube 51, and the sliding member 722 disengages from the inside of the groove 714. At this time, the motor drives the second transmission gear 77, the first transmission gear 76, the guide rod 73 and the lower support ring 78 to rotate. The first transmission gear 76 and the lower support ring 78 drive the support member 72, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 to move synchronously through the docking frame 711. Furthermore, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 drive the guide plate 66, the transmission rod 64, the connecting ear 67 and the transmission frame 63 to rotate along the inner wall of the connecting member 62. The guide rod 73 drives the sliding part 722 and the cleaning part 723, so that the cleaning part 723 moves along the outside of the heat exchange tube 51 with the support spindle 52 as the central axis, and moves vertically downward along the guide rod 73 to improve the stability of the operation of the cleaning part 723. The movement of the heat exchange tube 51 scrapes off the dirt attached to the surface of the heat exchange tube 51, thereby improving the waste heat transfer efficiency of the exhaust gas. This reciprocating motion cleans the surface of the heat exchange tube 51. Furthermore, the cleaning agent can be injected into the treatment box 1 through the flue pipe 2. The cleaning agent moves along the heat exchange tube 51 and works with the cleaning part 723 to improve the dirt removal effect. After cleaning, the cleaning component 723 and the sliding component 722 are reset, and the driving component 61 drives the resisting pushing component 65 to move in the opposite direction. At this time, the first arc-shaped guard plate 71 and the second arc-shaped guard plate 75 move relative to each other under the action of the reset elastic component 713 to form a circular tube sleeved on the outside of the heat exchange tube 51, so that the waste heat recovery treatment of the roasting furnace exhaust gas can continue.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a roasting furnace, comprising a processing box (1), characterized in that, Also includes: Heat exchange assembly (5), which is installed inside the processing box (1); Slag discharge pipe (3), the slag discharge pipe (3) is located at the bottom of the processing box (1); The outside of the slag discharge pipe (3) is provided with a smoke discharge pipe (4), and the top of the treatment box (1) is provided with a smoke inlet pipe (2). The heat exchange assembly (5) includes a cross support frame (53) fixedly installed at both ends inside the processing box (1), a support spindle (52) fixedly installed in the middle of the two cross support frames (53), and a heat exchange tube (51) fixedly installed on the outside of the support spindle (52). The heat exchange tube (51) is made of metal and is spiral in shape. Both ends of the heat exchange tube (51) extend to the outside of the processing box (1). Water enters the waste heat of the calcining furnace through the lower end of the heat exchange tube (51) and is discharged through the upper end of the heat exchange tube (51). The exhaust gas from the roasting furnace enters the treatment box (1) through the flue pipe (2) and moves along the heat exchange tube (51) to achieve heat exchange; The processing box (1) is provided with a protective component (7). The protective component (7) includes a first transmission gear (76) that is movably sleeved inside the processing box (1). The bottom of the first transmission gear (76) is fixed with a support member (72) through a docking frame (711). The support member (72) is a ring-shaped rod composed of two straight rods and two arc-shaped rods; The support member (72) has a first arc-shaped guard plate (71) and a second arc-shaped guard plate (75) symmetrically and movably sleeved on its straight rod. Both ends of the straight rod of the support member (72) are fixedly fitted with a docking plate (712). The docking plate (712) is provided with a reset elastic member (713) that supports the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75) against each other, so that the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75) form a circular tube. The first arc-shaped guard plate (71) and the second arc-shaped guard plate (75) form a circular tube inside the processing box (1), and the inner wall of the circular tube is in contact with the outer periphery of the heat exchange tube (51); The lower end of the processing box (1) is movably fitted with a lower support ring (78), and the round tube is located between the first transmission gear (76) and the lower support ring (78). The exhaust gas from the roasting furnace enters the treatment box (1) through the flue pipe (2), and is guided by the round pipe to move along the heat exchange tube (51); The protective assembly (7) also includes grooves (714) formed on the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75), and the first transmission gear (76) and the lower support ring (78) are connected by a guide rod (73); The guide rod (73) has a sleeve (721) that slides through a vertical guide groove (74) on its outside. A sliding member (722) located in a groove (714) is fixedly installed on the outside of the sleeve (721). When the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75) initially form a circular tube, the sliding member (722) is located inside the groove (714), so that the inner wall of the circular tube contacts the heat exchange tube (51); The end of the sliding member (722) is fixedly fitted with a cleaning member (723) that is attached to the heat exchange tube (51). The inside of the processing box (1) is provided with a second transmission gear (77) that meshes with the first transmission gear (76). The outside of the processing box (1) is provided with a motor for driving the second transmission gear (77) and the first transmission gear (76) to rotate.

2. The waste heat recovery device for the roasting furnace according to claim 1, characterized in that: The processing box (1) is equipped with a drive assembly (6), which includes a guide plate (66) fixed to the outside of the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75). The distance between the guide plate (66) and the ends of the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75) gradually decreases from top to bottom.

3. The waste heat recovery device for the roasting furnace according to claim 2, characterized in that: The processing box (1) is provided with a drive unit (61) on the outside. The output end of the drive unit (61) is equipped with a connector (62). The inner wall of the connector (62) is movably fitted with a transmission frame (63). The inner wall of the transmission frame (63) is connected to a transmission rod (64) and a contact pusher (65) through a connecting ear (67).

4. The waste heat recovery device for the roasting furnace according to claim 3, characterized in that: The abutting pusher (65) is attached to the inner wall of the guide plate (66), and the bottom of the abutting pusher (65) is attached to one corner of the guide plate (66) in an arc shape; The driving member (61) pushes the connecting member (62) and the abutting pusher (65) to move down along the inner wall of the guide plate (66). Through the cooperation between the abutting pusher (65) and the guide plate (66), the first arc-shaped guard plate (71) and the second arc-shaped guard plate (75) move to both ends along the straight rod of the support member (72).

Images