A kind of waste heat recovery device for roasting rotary kiln

Abstract

The present invention relates to the technical field of waste heat recovery, and discloses a waste heat recovery device for a roasting rotary kiln, comprising a heating tank, both ends of which are rotatably connected with legs, a driving mechanism and a heat recovery mechanism; the driving mechanism comprises a support plate arranged in the middle of the legs, a reciprocating driving assembly for driving the heating tank to swing back and forth is arranged on the support plate, and a heating assembly is arranged on the side of the heating tank close to the ground; the heat recovery mechanism comprises a heat conducting pipe assembly attached to the side of the heating tank away from the ground, the heat conducting pipe assembly is in an S-shaped structure and evenly distributed along the axis of the heating tank, a liquid heat conducting medium is arranged inside the heat conducting pipe assembly, and the end of the heating tank close to the discharge is inclined toward the ground. The present invention arranges an S-shaped heat conducting pipe assembly above the heating tank, the heating assembly is located below the heating tank, and the heat conducting pipe assembly is located above the heating tank, thereby avoiding the heat generated by the heating assembly from being directly transferred to the heat recovery mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery, in particular to a roasting rotary kiln waste heat recovery device. Background Art

[0002] A rotary kiln is a rotating calcining kiln, which is a high-temperature processing equipment used to heat materials to high temperatures in a continuous process. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the materials they process. During the heating process, a rotating heating tank is required to heat the materials.

[0003] Existing heating tanks are all continuously rotating, and straight water pipes are evenly distributed on the outside of the heating tank for heat recovery processing. However, the heating device of the heating tank is also evenly distributed on the outside of the heating tank, which causes part of the heat generated by the heating device to be directly transferred to the water pipe, thereby resulting in a waste of heat energy. Therefore, it needs to be improved. Summary of the invention

[0004] The present invention provides a roasting rotary kiln waste heat recovery device, which solves the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A waste heat recovery device for a roasting rotary kiln comprises a heating tank, both ends of which are rotatably connected with legs, a driving mechanism and a heat recovery mechanism; the driving mechanism comprises a support plate arranged in the middle of the legs, a reciprocating driving assembly for driving the heating tank to swing back and forth is arranged on the support plate, and a heating assembly is arranged on the side of the heating tank close to the ground; the heat recovery mechanism comprises a heat conducting pipe assembly attached to the side of the heating tank away from the ground, the heat conducting pipe assembly is in an S-shaped structure and is evenly distributed along the axis of the heating tank, a liquid heat conducting medium is arranged inside the heat conducting pipe assembly, and an end of the heating tank close to the discharge is inclined toward the ground, and when the heating tank swings back and forth, the liquid heat conducting medium moves along the heat conducting pipe assembly from the feeding end of the heating tank to the discharge end of the heating tank.

[0007] As a preferred technical solution of the present invention, the heat pipe assembly includes an inclined heat pipe with a spiral structure, the rotation directions of two adjacent inclined heat pipes are opposite, the two adjacent inclined heat pipes are connected through an arc-shaped connecting pipe, and the ends of the inclined heat pipes located at the feed end and the discharge end of the heating tank are provided with feed and discharge connecting pipes. The liquid heat transfer medium is a low melting point alloy.

[0008] As a preferred technical solution of the present invention, material guide plates are evenly distributed on the side of the inner wall of the heating tank close to the ground, and two adjacent material guide plates are cross-arranged. When the heating tank swings back and forth, the material moves along the material guide plates from the feed end of the heating tank to the discharge end of the heating tank.

[0009] As a preferred technical solution of the present invention, a crossbeam is arranged between the two support plates, a base is arranged at the bottom of the support plates, and terminals are arranged at both ends of the heating tank. The heating assembly includes an air guide block arranged on the crossbeam, and a burner head is arranged on the air guide block for heating the side of the heating tank close to the ground.

[0010] As a preferred technical solution of the present invention, the reciprocating drive assembly includes a first bearing seat fixedly connected to the support plate, the first bearing seat is rotatably connected to the drive shaft, the end of the drive shaft is fixedly connected to the drive gear, and the end of the heating tank is provided with a driven gear ring meshing with the drive gear. The end of the crossbeam is provided with a second bearing seat, the second bearing seat is rotatably connected to the transmission rod, the middle of the crossbeam is fixedly connected to a protective frame rotatably connected to the transmission rod, the middle of the protective frame is provided with a drive motor, the output shaft of the drive motor is fixedly connected to the first pulley, the first pulley is connected to the second pulley through the first belt, the second pulley is fixedly connected to the middle of the transmission rod, the end of the transmission rod is provided with a third pulley, the third pulley is connected to the fourth pulley through the second belt, and the fourth pulley is fixedly connected to the end of the drive shaft.

[0011] The present invention has the following benefits:

[0012] By arranging an S-shaped heat-conducting pipe assembly above the heating tank, the forward and backward shaking of the heating tank itself can drive the liquid heat-conducting medium to flow in the heat-conducting pipe assembly, thereby taking away the residual heat above the heating tank, and a material guide plate is cross-arranged at the bottom of the heating tank, so that the material can roll along the bottom of the heating tank and move in a direction at the same time, thereby improving the heating effect of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 The figure is a schematic diagram of the structure of a waste heat recovery device for a roasting rotary kiln.

[0015] Figure 2 It is a front view of a waste heat recovery device for a roasting rotary kiln.

[0016] Figure 3 The present invention is a schematic diagram of the structure of a heat recovery mechanism in a waste heat recovery device for a roasting rotary kiln.

[0017] Figure 4 The present invention is a schematic diagram of the structure of the end of a heating tank in a waste heat recovery device of a roasting rotary kiln.

[0018] Figure 5 This is a schematic diagram of the structure below the heating tank in a roasting rotary kiln waste heat recovery device.

[0019] Figure 6 for Figure 5 A is a partial enlarged schematic diagram of the middle part.

[0020] Figure 7 The figure is a schematic diagram of the structure inside the heating tank in a roasting rotary kiln waste heat recovery device.

[0021] In the figure: 1. heating tank; 2. support leg; 3. driving mechanism; 4. heat recovery mechanism; 5. inclined heat pipe; 6. arc connecting pipe; 7. inlet and outlet connecting pipe; 8. heat pipe assembly; 9. end; 10. base; 11. support plate; 12. crossbeam; 13. first bearing seat; 14. driving shaft; 15. driving gear; 16. driven gear ring; 17. reciprocating drive assembly; 18. combustion head; 19. transmission rod; 20. second bearing seat; 21. third pulley; 22. second belt; 23. fourth pulley; 24. air guide block; 25. protective frame; 26. second pulley; 27. first belt; 28. first pulley; 29. ​​driving motor; 30. material guide plate; 31. heating assembly. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In one embodiment, see Figure 1-Figure 7 A roasting rotary kiln waste heat recovery device includes a heating tank 1, both ends of the heating tank 1 are rotatably connected with legs 2, the legs 2 are arranged to be inclined outward, and bearing sleeves are arranged at the left and right ends of the heating tank 1 so that the heating tank 1 can rotate freely, and also includes a driving mechanism 3 and a heat recovery mechanism 4;

[0024] The driving mechanism 3 includes a support plate 11 arranged at the middle of the support leg 2, the support plate 11 is fixed at the middle of the support leg 2 in a front-to-back direction, a reciprocating driving assembly 17 is arranged on the support plate 11, the reciprocating driving assembly 17 can drive the heating tank 1 to swing back and forth, and the heating tank 1 is tilted toward the lower right, and the left and right ends of the heating tank 1 are provided with end heads 9, the material enters through the left side of the heating tank 1, when the heating tank 1 swings back and forth, the material rolls back and forth at the bottom of the heating tank 1, and because the heating tank 1 is tilted, the material will slide to the right while rolling back and forth, and finally be discharged through the right end of the heating tank 1, and a heating assembly 31 is arranged below the heating tank 1, the heating assembly 31 can heat the bottom of the heating tank 1, so that the heat is transferred to the inside of the heating tank 1, so as to heat the material inside;

[0025] The heat recovery mechanism 4 includes a heat-conducting pipe assembly 8 attached to the top of the heating tank 1. The heat-conducting pipe assembly 8 is made of heat-conducting material, and when viewed from above, the heat-conducting pipe assembly 8 is an S-shaped structure placed in the left-right direction and laid from left to right on the top of the heating tank 1, and the heat-conducting pipe assembly 8 is attached to the upper half of the heating tank 1. A liquid heat-conducting medium is arranged inside the heat-conducting pipe assembly 8. The liquid heat-conducting medium is a low-melting-point alloy, and a certain proportion of bismuth, cadmium, tin, lead, dysprosium, indium and other elements are used as main components. When the heating tank 1 is working normally, the liquid heat-conducting medium flows in the heat-conducting pipe assembly 8 in a liquid state. The left end of the heat-conducting pipe assembly 8 is connected to the feed end, and the right end of the heat-conducting pipe assembly 8 is connected to the discharge end. When When the heating tank 1 is shaken back and forth, the liquid heat-conducting medium continuously flows inside the heat-conducting pipe assembly 8. When the heating tank 1 tilts to one side, there is less heat-conducting medium inside the heat-conducting pipe assembly 8 on the far left. Therefore, the heat-conducting medium starts to be replenished at the left end. As the left end is continuously replenished and the heating tank 1 is continuously shaken back and forth, the liquid heat-conducting medium will gradually shift to the right side. As a result, the shaking of the heating tank 1 back and forth increases the power of the liquid heat-conducting medium to move from left to right inside the heat-conducting pipe assembly 8. The liquid heat-conducting medium that has completed absorbing heat will be discharged from the right end of the heat-conducting pipe assembly 8 for external heat circulation treatment. After the heat release is completed, it will enter the heat-conducting pipe assembly 8 again, thereby realizing the entire cycle treatment.

[0026] In one case of the present embodiment, the heat pipe assembly 8 includes an inclined heat pipe 5 with a spiral structure, the rotation directions of two adjacent inclined heat pipes 5 are opposite, the two adjacent inclined heat pipes 5 are connected by an arc-shaped connecting pipe 6, and the ends of the inclined heat pipes 5 located at the feed end and the discharge end of the heating tank 1 are provided with feed and discharge connecting pipes 7. The rear end of the inclined heat-conducting tube 5 at the far left only extends to the upper end of the heating tank 1. Therefore, when the upper part of the heating tank 1 deflects backward, under the action of the connecting vessel moving away, most of the liquid will enter the rear end of the second inclined heat-conducting tube 5 from left to right, and then when the upper part of the heating tank 1 deflects forward again, a part of the liquid heat-conducting medium in the second inclined heat-conducting tube 5 will be transferred to the third inclined heat-conducting tube 5. Therefore, as the heating tank 1 continues to swing back and forth, the liquid heat-conducting medium will continue to be transferred to the right side. At this time, the liquid heat-conducting medium in the first inclined heat-conducting tube 5 on the far left will be reduced and replenished through the inlet and outlet connecting tube 7 on the left side. When the upper part of the heating tank 1 rotates backward, since the rear end of the inclined heat-conducting tube 5 at the far right is only located in the middle of the heating tank 1, the inclined heat-conducting tube 5 at the far right will discharge the liquid heat-conducting medium to the outside. Therefore, the inclined heat-conducting tubes 5 on the left and right sides drive the liquid to move to the right when the heating tank 1 shakes. That is to say, as the heating tank 1 shakes back and forth, a certain conveying effect is achieved, and there is no need to set up an additional pump for driving.

[0027] In one case of this embodiment, material guide plates 30 are evenly distributed on the side of the inner wall of the heating tank 1 close to the ground, and two adjacent material guide plates 30 are cross-arranged. When the heating tank 1 swings back and forth, the material moves along the material guide plates 30 from the feed end of the heating tank 1 to the discharge end of the heating tank 1. The ends of the guide plates 30 close to the center of the heating tank 1 are tilted to the right, and the positions of the left and right guide plates 30 close to the center of the heating tank 1 have a certain overlap in the left and right directions. For example, when the bottom of the heating tank 1 moves forward, the material will move backward with the front guide plate 30, and the material will slide to the rear of the adjacent guide plate 30 on the right. At this time, when the bottom of the heating tank 1 moves backward again, the material will slide forward with the rear guide plate 30. At this time, the material will slide onto the adjacent front guide plate 30 on the right. Therefore, as the heating tank 1 itself shakes back and forth, the material is transferred to the right, and the guide plate 30 has a certain effect of promoting the transfer. In addition, due to the existence of the guide plate 30, the material cannot slide directly to the right, which increases the movement time of the material in the heating tank 1 and makes the material tumble inside the heating tank 1, thereby improving the heating effect of the material.

[0028] In one case of the present embodiment, a crossbeam 12 is arranged between the two support plates 11, the crossbeam 12 is arranged in a left-right direction and the left and right ends are fixedly connected to the middle of the support plate 11, a base 10 is arranged at the bottom of the support plate 11, the base 10 is also arranged in a left-right direction, and the left and right ends of the base 10 are fixedly connected to the lower end of the support plate 11, and the entire device can be stably placed on the ground through the front and rear bases 10, and end heads 9 are arranged at both ends of the heating tank 1, and materials can be fed through the end head 9 on the left and discharged from the end head 9 on the right.

[0029] In one case of the present embodiment, the heating assembly 31 includes an air guide block 24 arranged on the cross beam 12, and the air guide block 24 is provided with a combustion head 18 for heating the bottom of the tank 1. The air guide block 24 is connected to a gas source of relevant natural gas, and the natural gas is uniformly introduced into the combustion head 18 through the air guide block 24. The combustion head 18 burns the natural gas, thereby heating the bottom of the tank 1 by flame heating.

[0030] In one case of this embodiment, the reciprocating drive assembly 17 includes a first bearing seat 13 fixedly connected to the support plate 11, the first bearing seat 13 is rotatably connected to the drive shaft 14, the end of the drive shaft 14 is fixedly connected to the drive gear 15, and the end of the heating tank 1 is provided with a driven gear ring 16 meshing with the drive gear 15. The end of the crossbeam 12 is provided with a second bearing seat 20, the second bearing seat 20 is rotatably connected to the transmission rod 19, the middle of the crossbeam 12 is fixedly connected to a protection frame 25 rotatably connected to the transmission rod 19, the middle of the protection frame 25 is provided with a drive motor 29, the output shaft of the drive motor 29 is fixedly connected to a first pulley 28, the first pulley 28 is connected to the second pulley 26 through a first belt 27, the second pulley 26 is fixedly connected to the middle of the transmission rod 19, the end of the transmission rod 19 is provided with a third pulley 21, the third pulley 21 is connected to the fourth pulley 23 through a second belt 22, and the fourth pulley 23 is fixedly connected to the end of the drive shaft 14. The driving motor 29 is arranged in the middle of the lower surface of the cross beam 12. The driving motor 29 rotates the transmission rod 19 through a belt drive. The transmission rod 19 rotates the driving shafts 14 at both ends through a belt drive. The driving shaft 14 rotates the left and right ends of the heating tank 1 through a gear drive. The output shaft of the driving motor 29 is intermittently forward and reversed, so the heating tank 1 can achieve the effect of shaking back and forth.

[0031] During the implementation of this embodiment, the device is installed in the entire roasting process, so that the left and right ends of the heating tank 1 are connected to the relevant processing equipment, so that the material enters from the left end of the heating tank 1 and is discharged from the right end, and the inlet and outlet connecting pipes 7 at both ends are connected to the heat release end of the relevant liquid heat transfer medium. The liquid heat transfer medium can be used to preheat the material to be roasted, thereby improving the thermal energy utilization rate of the entire device.

[0032] The drive motor 29 is started, and the output shaft of the drive motor 29 continuously rotates forward and reversely. The drive motor 29 drives the heating tank 1 forward and reversely through the belt drive. The material inside the heating tank 1 continuously rolls forward and backward, and the material continuously moves to the right along with the material guide plate 30 to achieve the material roasting process. At this time, the excess heat above the heating tank 1 will be transferred to the liquid heat-conducting medium in the heat-conducting pipe assembly 8. Due to the forward and backward shaking of the heating tank 1 itself, the S-shaped heat-conducting pipe assembly 8 will continuously transport the liquid heat-conducting medium on the left to the right end. The liquid heat-conducting medium will absorb heat when flowing in the heat-conducting pipe assembly 8, thereby recovering the waste heat of the heating tank 1. The heating assembly 31 is located below the heating tank 1, and the heat recovery mechanism 4 is located above the heating tank 1, thereby avoiding the heat generated by the heating assembly 31 from being directly transferred to the heat recovery mechanism 4.

[0033] The present invention is applicable to a waste heat recovery device for a roasting rotary kiln. An S-shaped heat conducting pipe assembly 8 is arranged above a heating tank 1, so that the forward and backward shaking of the heating tank 1 itself can drive a liquid heat conducting medium to flow in the heat conducting pipe assembly 8, thereby taking away the waste heat above the heating tank 1. In addition, a material guide plate 30 is cross-arranged at the bottom of the heating tank 1, so that the material can roll along the bottom of the heating tank 1 while also moving in a directional manner, thereby improving the heating effect of the material.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A roasting rotary kiln waste heat recovery device, comprising a heating tank, both ends of which are rotatably connected with legs, characterized in that: It also includes a driving mechanism and a heat recovery mechanism; The driving mechanism comprises a support plate arranged in the middle of the supporting leg, on which a reciprocating driving assembly for driving the heating tank to swing back and forth is arranged, and a heating assembly is arranged on the side of the heating tank close to the ground; The heat recovery mechanism includes a heat conducting pipe assembly attached to the side of the heating tank away from the ground, the heat conducting pipe assembly is in an S-shaped structure and evenly distributed along the axis of the heating tank, a liquid heat conducting medium is arranged inside the heat conducting pipe assembly, and the end of the heating tank close to the discharge is inclined toward the ground. When the heating tank swings back and forth, the liquid heat conducting medium moves along the heat conducting pipe assembly from the feed end of the heating tank to the discharge end of the heating tank; The heat-conducting pipe assembly comprises an inclined heat-conducting pipe with a spiral structure, wherein the spiral directions of two adjacent inclined heat-conducting pipes are opposite, and the two adjacent inclined heat-conducting pipes are connected through an arc-shaped connecting pipe, and the ends of the inclined heat-conducting pipes located at the feeding end and the discharging end of the heating tank are provided with feeding and discharging connecting pipes; The heat conducting pipe assembly is fitted onto the upper part of the heating tank.

2. A roasting rotary kiln waste heat recovery device according to claim 1, characterized in that: The liquid heat-conducting medium is a low-melting-point alloy.

3. A roasting rotary kiln waste heat recovery device according to claim 1, characterized in that: The inner wall of the heating tank is evenly provided with guide plates on one side close to the ground, and two adjacent guide plates are cross-arranged. When the heating tank swings back and forth, the material moves along the guide plates from the feed end of the heating tank to the discharge end of the heating tank.

4. The roasting rotary kiln waste heat recovery device according to claim 1, characterized in that: A crossbeam is arranged between the two supporting plates, a base is arranged at the bottom of the supporting plates, and ends are arranged at both ends of the heating tank.

5. A roasting rotary kiln waste heat recovery device according to claim 4, characterized in that: The heating assembly comprises an air guide block arranged on the crossbeam, and a burner head for heating the side of the heating tank close to the ground is arranged on the air guide block.

6. A roasting rotary kiln waste heat recovery device according to claim 4, characterized in that: The reciprocating drive assembly includes a first bearing seat fixedly connected to the support plate, the first bearing seat is rotatably connected to a drive shaft, the end of the drive shaft is fixedly connected to a drive gear, and the end of the heating tank is provided with a driven gear ring meshing with the drive gear.

7. A roasting rotary kiln waste heat recovery device according to claim 6, characterized in that: A second bearing seat is provided at the end of the crossbeam, and the second bearing seat is rotatably connected to the transmission rod. A protective frame rotatably connected to the transmission rod is fixedly connected to the middle part of the crossbeam, and a driving motor is provided in the middle part of the protective frame. The output shaft of the driving motor is fixedly connected to the first pulley, and the first pulley is connected to the second pulley through the first belt, and the second pulley is fixedly connected to the middle part of the transmission rod. A third pulley is provided at the end of the transmission rod, and the third pulley is connected to the fourth pulley through the second belt, and the fourth pulley is fixedly connected to the end of the driving shaft.

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