Rotary furnace with high sealing performance

Abstract

The utility model discloses a high-sealing rotary furnace which comprises a furnace body, a discharge port is arranged at the bottom end of the tail of the furnace body, a first pipe body is arranged below the discharge port, a first impeller assembly capable of rotating in the first pipe body is connected in the first pipe body, and the first impeller assembly can transfer out materials discharged from the discharge port through rotation of blades and can also transfer out materials discharged from the discharge port through rotation of the blades. Heat and gas in the furnace body can be isolated and sealed through a closed space formed by the blades and the first pipe body, and a second pipe body and a second impeller assembly which are similar in structure and function can be arranged at a feeding opening in the head of the furnace body, so that the heat energy and the reducing gas consumption in the material pyrolysis process of the rotary furnace are saved; meanwhile, the stability and efficiency of pyrolysis are improved, and in addition, untreated toxic waste gas can be prevented from escaping to pollute the environment.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a high-sealing rotary kiln. Background Art

[0002] In lithium battery recycling, the waste lithium batteries must be crushed first, and then the waste lithium battery fragments are sent to the rotary furnace for pyrolysis. During the pyrolysis of the waste lithium battery fragments in the rotary furnace, the furnace body needs to be heated and pressurized to keep the waste lithium battery fragments in a high-temperature and high-pressure pyrolysis environment. Pyrolysis will separate the organic matter and powder in the waste lithium battery fragments. The toxic waste gas generated during the pyrolysis process needs to be extracted through the exhaust system on the furnace body, and then the waste lithium battery material after pyrolysis is discharged from the furnace body. This process requires a lot of heat energy. In order to reduce heat loss and save Energy, but also to prevent the discharge of untreated toxic waste gas, need to make good sealing measures for the pyrolysis furnace, in the existing technology, mainly the furnace head and furnace tail parts take fish scales and other sealing measures, the inlet and outlet sealing treatment is less, so that the heat in the pyrolysis furnace will escape through the inlet and outlet, in addition, the nitrogen and other reducing protective gases filled into the furnace body during the heating process will also escape from the inlet and outlet, resulting in energy loss and reducing gas loss, and also causing the temperature and pressure in the furnace body to be unstable, affecting the pyrolysis efficiency and effect. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a rotary kiln sealing device which takes good sealing measures for the inlet and outlet.

[0004] The cam is connected to the second end of the first tube portion and the second end of the second tube portion is connected to the first end of the second tube portion.

[0005] Preferably, during the rotation of the first impeller assembly, there is always at least one first storage space connected to the first vertical tube portion, and there is always at least one first release space connected to the second vertical tube portion. The first storage space is formed by dividing the inner cavity of the first transverse tube portion by two adjacent blades, and the first release space is formed by dividing the inner cavity of the first transverse tube portion by two adjacent blades.

[0006] Preferably, the high-sealing rotary kiln also includes a spiral transmission mechanism, a hopper, and a second tube body. The discharge end of the spiral transmission mechanism extends into the furnace body through the furnace head, and the outer wall of the spiral transmission mechanism is sealed with the inner wall of the first feed port of the furnace head; the hopper is located above the spiral transmission mechanism; the second tube body includes a third vertical tube part, a second horizontal tube part, and a fourth vertical tube part that are connected and communicated in sequence, the upper opening of the third vertical tube part is sealed to connect with the outlet of the hopper, the two end openings of the second horizontal tube part are sealed and connected with the third end cover and the fourth end cover, and the lower opening of the fourth vertical tube part is sealed to connect with the second feed port of the spiral transmission mechanism; the second The second rotating shaft of the impeller assembly is rotatably assembled on the third end cover and the fourth end cover of the second transverse tube portion and is coaxially arranged with the second transverse tube portion and can rotate in the second transverse tube portion. One end of the second rotating shaft extends out of the third end cover and is connected to the second motor. During the rotation of the second impeller assembly, there is always a third enclosed space located on the left side of the axis of the third vertical tube portion, and there is always a fourth enclosed space located on the right side of the axis of the third vertical tube portion. The third enclosed space and the fourth enclosed space are both separated by adjacent blades on the second impeller assembly in the second transverse tube portion so that the third vertical tube portion and the fourth vertical tube portion are always kept isolated.

[0007] Preferably, during the rotation of the second impeller assembly, there is always at least one second storage space connected to the third vertical tube portion, and there is always at least one second release space connected to the fourth vertical tube portion. The second storage space is formed by dividing the inner cavity of the second transverse tube portion by two adjacent blades, and the second release space is formed by dividing the inner cavity of the second transverse tube portion by two adjacent blades.

[0008] Preferably, the first rotating shaft and the first end cover and the second end cover are rotatably connected through the first bearing and the second bearing installed on the first end cover and the second end cover, and a packing seal is formed between the first rotating shaft and the first end cover and the second end cover in the direction of the first bearing and the second bearing toward the first impeller assembly.

[0009] Preferably, the second rotating shaft and the third end cover and the fourth end cover are rotatably connected through the third bearing and the fourth bearing installed on the third end cover and the fourth end cover, and a packing seal is formed between the second rotating shaft and the third end cover and the fourth end cover in the direction of the third bearing and the fourth bearing toward the second impeller assembly.

[0010] Preferably, the peripheries of the blades of the first impeller assembly and the blades of the second impeller assembly are covered with polyfluoroethylene sealing strips or wear-resistant nitrile sealing strips.

[0011] Preferably, the furnace head and / or furnace tail are connected to a first pressure sensor, a first pressure relief valve and / or a second pressure sensor and a second pressure relief valve that are in communication with the furnace inner cavity.

[0012] The beneficial effects of the present invention are as follows: by arranging a first tube body internally connected to the first impeller assembly above the feed port of the recovery furnace, and arranging a second tube body internally connected to the second impeller assembly below the discharge port, the heat and reducing gases in the rotary kiln can be effectively prevented from escaping from the feed port and the discharge port when the rotary kiln is fed and discharged, thereby improving the sealing of the rotary kiln, saving energy and the amount of reducing gas used, and at the same time enhancing the stability of the temperature and pressure in the rotary kiln, improving the pyrolysis efficiency and effect, and moreover, more efficiently extracting exhaust gas from the rotary kiln which always maintains a relatively high and stable pressure environment through the exhaust system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural schematic diagram of a rotary kiln sealing device proposed in the utility model.

[0014] Figure 2 This is a structural schematic diagram of the first tube body, the first impeller assembly and the furnace tail part proposed in the present utility model.

[0015] Figure 3 This is a structural schematic diagram of the first tube body and the first impeller assembly proposed in the present utility model.

[0016] Figure 4 for Figure 3 Cross-sectional view at position AA.

[0017] Figure 5 This is a structural diagram of the spiral transmission mechanism, hopper, second tube body, second impeller assembly and burner head part proposed in the utility model. DETAILED DESCRIPTION

[0018] The specific implementation of the present utility model will be described in detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 4As shown, a high-sealing rotary kiln comprises: a furnace body 1, a discharge port 111 at the bottom end of the furnace body tail 11, a first tube body 2, the first tube body 2 is located below the discharge port 111 of the furnace body 1, the first tube body 2 comprises a first vertical tube portion 21, a first horizontal tube portion 22, and a second vertical tube portion 23 which are connected and communicated in sequence, a flange 231 can be provided below the second vertical tube portion for convenient connection with the material collecting structure below, an opening on the first vertical tube portion 21 is sealed to connect with the discharge port 111 of the furnace body 1, a flange 211 can be provided on the first vertical tube portion for convenient sealing connection with the discharge port 111, both ends of the first horizontal tube portion 22 are sealedly connected with a first end cover 3 and a second end cover 4; a first horizontal tube portion 22 is provided in the first horizontal tube portion 22 An impeller assembly 5, the first rotating shaft 51 of the first impeller assembly 5 is rotatably assembled on the first end cover 3 and the second end cover 4 and is coaxially arranged with the first transverse tube portion 22 and can rotate in the first transverse tube portion 22, the first rotating shaft 51 extends out of the first end cover 3 and is connected to the first motor. During the rotation of the first impeller assembly 5, there is always a first enclosed space 53 located on the left side of the axis of the first vertical tube portion 21, and there is always a second enclosed space 54 located on the right side of the axis of the first vertical tube portion 21. The first enclosed space 53 and the second enclosed space 54 are both separated by adjacent blades 52 on the first impeller assembly 5 in the inner cavity of the first transverse tube portion 22 so that the first vertical tube portion 21 and the second vertical tube portion 23 are always kept isolated.

[0020] like Figure 1 As shown, in actual application, the high-sealing recovery furnace will be placed on the frame 25 at a slight tilt so that the waste lithium battery material can enter and exit the furnace body 1 more smoothly to complete the pyrolysis. The pyrolysis process requires heating and pressurizing the furnace body 1, and it is necessary to fill the furnace body 1 with reducing protective gases such as nitrogen from the air intake system 19. Harmful waste gas will be generated during the pyrolysis process and needs to be discharged from the exhaust system 24. After the pyrolysis is completed, the waste lithium battery material will be discharged from the discharge port 111 and fall into the first vertical pipe part 21 under the action of its own weight, and then fall into the blades 52 of the first impeller assembly 5 in the first horizontal pipe part 22. The first motor drives the first rotating shaft 51 to rotate, driving the blades 52 to rotate, so that the waste lithium battery material after the pyrolysis on the blades 52 can be transferred to the second vertical pipe part 23 for subsequent It continues to fall into the material collecting mechanism below. Since there is always a first enclosed space 53 located on the left side of the axis of the first vertical tube part 21 during the rotation of the first impeller assembly 5, and there is always a second enclosed space 54 located on the right side of the axis of the first vertical tube part 21, the first enclosed space 53 and the second enclosed space 54 are both separated by adjacent blades 52 on the first impeller assembly 5 in the inner cavity of the first transverse tube part 22 so that the first vertical tube part 21 and the second vertical tube part 23 are always kept isolated, thereby isolating the heat and reducing gas and harmful exhaust gas in the furnace body 1 connected to the second vertical tube part 23 from escaping from the first vertical tube part 21, achieving a high sealing effect, saving heat energy and reducing gas, and preventing the discharge of harmful exhaust gas from polluting the environment.

[0021] like Figure 3 As shown, during the rotation of the first impeller assembly 5, there is always at least one first receiving space 55 connected to the first vertical tube portion 21, and there is always at least one first release space 56 connected to the second vertical tube portion 23. The first receiving space 55 is formed by dividing the inner cavity of the first transverse tube portion 22 by two adjacent blades 52, and the first release space 56 is formed by dividing the inner cavity of the first transverse tube portion 22 by two adjacent blades 52.

[0022] The material falling from the first vertical tube portion 21 can enter the first receiving space 55 surrounded by two adjacent blades 52, and is driven by the first rotating shaft 51 to move to the position of the first release space 56, and then falls into the second vertical tube portion 23, so that the first tube body 2 plays the role of connecting the inner cavity of the furnace body 1 and the material collection mechanism.

[0023] like Figure 5 As shown, the high-sealing rotary kiln also includes a spiral transmission mechanism 6, the discharge end 61 of the spiral transmission mechanism 6 passes through the furnace head 12 and extends into the furnace body 1, the outer wall of the spiral transmission mechanism 6 is sealed with the inner wall of the first feed port 121 of the furnace head 12, and a hopper 7 is provided above the spiral transmission mechanism 6. In actual application, the waste lithium battery fragments are transported to the hopper 7 by a conveyor belt device, and a second tube body 8 is connected between the hopper 7 and the spiral transmission mechanism 6. The second tube body 8 includes a third vertical tube part 81, a second horizontal tube part 82, and a fourth vertical tube part 83 which are connected and communicated in sequence. The upper opening of the third vertical tube part 81 is sealed to connect with the outlet 71 of the hopper 7, and the openings at both ends of the second horizontal tube part 82 are sealed and connected with the third end cover and the fourth end cover, and the lower opening of the fourth vertical tube part 83 is sealed to connect with the second feed port 62 of the spiral transmission mechanism 6, and the second rotating shaft of the second impeller assembly 9 is rotatably assembled on the third end cover and the fourth end cover of the second horizontal tube part 82 and is connected to the second The horizontal tube portion 82 is coaxially arranged and can rotate in the second horizontal tube portion 82. One end of the second rotating shaft extends out of the third end cover and is connected to the second motor. The material in the hopper 7 falls from the outlet 71 into the third vertical tube portion 81 sealed with it under the action of its own weight, and then continues to fall onto the blades of the second impeller assembly 9 of the second horizontal tube portion 82. The rotating second rotating shaft drives the blades to rotate and transfer the material to the fourth vertical tube portion 83. The material continues to fall and falls into the second feed port 62 of the spiral transmission mechanism 6, and is finally fed into the furnace body 1 by the spiral feeding mechanism 6. During the rotation of the second impeller assembly 9, there is always a third enclosed space located on the left side of the axis of the third vertical tube portion 81, and there is always a fourth enclosed space located on the right side of the axis of the third vertical tube portion 83. The third enclosed space and the fourth enclosed space are both separated by 9 adjacent blades on the second impeller assembly in the second horizontal tube portion 82 so that the third vertical tube portion 81 and the fourth vertical tube portion 83 are always kept isolated.

[0024] Since the third vertical pipe portion 81 and the fourth vertical pipe portion 83 are isolated by the third enclosed space and the fourth enclosed space surrounded by adjacent blades of the second impeller assembly 9 in the second transverse pipe portion 82, the heat, reducing gas and harmful exhaust gas in the furnace body 1 connected to the fourth vertical pipe portion 83 can be isolated from escaping outward through the third vertical pipe portion 21, thereby achieving a high sealing effect, saving heat energy and reducing gas, and preventing the discharge of harmful exhaust gas from polluting the environment.

[0025] During the rotation of the second impeller assembly 9, there is always at least one second storage space 95 connected to the third vertical tube portion 81, and there is always at least one second release space 96 connected to the fourth vertical tube portion 83. The second storage space 95 is formed by dividing the inner cavity of the second transverse tube portion 82 by two adjacent blades, and the second release space 96 is formed by dividing the inner cavity of the second transverse tube portion 82 by two adjacent blades.

[0026] The material falling from the third vertical pipe portion 81 can enter the second receiving space 95 surrounded by two adjacent blades of the second impeller assembly 9, and is driven by the second rotating shaft to move to the position of the second release space 96, and then falls into the fourth pipe portion 83, so that the second pipe body 8 plays the role of connecting the hopper 7 and the spiral transmission mechanism 6.

[0027] The first rotating shaft 51 and the first end cover 3 and the second end cover 4 are rotatably connected through the first bearing and the second bearing 13 installed on the first end cover 3 and the second end cover 4. A packing sealing mechanism 14 is arranged between the first rotating shaft 51 and the first end cover 3 and the second end cover 4 in the direction where the first bearing and the second bearing 13 face the first impeller assembly 5.

[0028] The packing seal 14 can enhance the sealing performance of the first tube body 2 on the one hand, and prevent the material in the first impeller assembly 5 from entering the first bearing and the second bearing 13 to affect their rotation on the other hand, thereby ensuring the reliability of the first impeller assembly 5.

[0029] The second rotating shaft and the third end cover and the fourth end cover are rotatably connected through the third bearing and the fourth bearing installed on the third end cover and the fourth end cover, and a packing seal 14 is provided between the second rotating shaft and the third end cover and the fourth end cover in the direction of the third bearing and the fourth bearing toward the second impeller assembly 9.

[0030] The packing seal 14 can enhance the sealing performance of the second tube body 8 on the one hand, and prevent the material in the second impeller assembly 9 from entering the third bearing and the fourth bearing to affect their rotation on the other hand, thereby ensuring the reliability of the second impeller assembly 9.

[0031] The peripheries of the blades 52 of the first impeller assembly 5 and the blades of the second impeller assembly 9 are covered with polyvinyl fluoride sealing strips or wear-resistant nitrile sealing strips.

[0032] The polyvinyl fluoride sealing strip or the wear-resistant nitrile sealing strip can enhance the sealing of the first enclosed space 53 and the second enclosed space 54 surrounded by the two adjacent blades 52 of the first impeller assembly 5 and the inner cavity of the first transverse tube portion 22. Similarly, the sealing of the third enclosed space and the fourth enclosed space in the second transverse tube portion 82 is also enhanced. At the same time, after the seal is worn, it can be easily replaced.

[0033] The furnace head 12 and / or the furnace tail 11 are connected to a first pressure sensor 15 , a first pressure relief valve 16 and / or a second pressure sensor 17 and a second pressure relief valve 18 which are in communication with the furnace body 1 .

[0034] Due to the sealing effect of the first impeller assembly 5 in the first pipe 2 and the second impeller assembly 9 in the second pipe body, the pressure of the rotary kiln may be too high. The pressure at the head 12 of the furnace body and / or the pressure at the tail 11 of the furnace body are controlled by the first pressure sensor 15 and the first pressure relief valve 16. Once the first pressure sensor 5 / the second pressure sensor 17 detects that the pressure in the rotary kiln is too high, the rotary kiln is depressurized by the first pressure relief valve 16 / the second pressure relief valve 18, thereby improving the safety of the rotary kiln sealing device.

[0035] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-sealing rotary kiln, characterized in that: include: A furnace body (1), a discharge port (111) at the bottom end of the furnace body tail (11), and a first tube body (2); A first tube body (2), the first tube body (2) being located below the discharge port (111) of the furnace body (1), the first tube body (2) comprising a first vertical tube portion (21), a first horizontal tube portion (22), and a second vertical tube portion (23) which are connected and communicated in sequence, an upper opening of the first vertical tube portion (21) being sealed and docked with the discharge port (111) of the furnace body (1), and both end openings of the first horizontal tube portion (22) being sealed and connected with a first end cover (3) and a second end cover (4); A first impeller assembly (5) is provided in the first transverse tube portion (22). A first rotating shaft (51) of the first impeller assembly (5) is rotatably assembled on the first end cover (3) and the second end cover (4) and is coaxially arranged with the first transverse tube portion (22) and rotatable in the first transverse tube portion (22). The first rotating shaft (51) extends out of the first end cover (3) and is connected to the first motor. During the rotation of the first impeller assembly (5), there is always a first enclosed space (53) located on the left side of the axis of the first vertical tube portion (21), and there is always a second enclosed space (54) located on the right side of the axis of the first vertical tube portion (21). The first enclosed space (53) and the second enclosed space (54) are both separated by adjacent blades (52) on the first impeller assembly (5) in the inner cavity of the first transverse tube portion (22), so that the first vertical tube portion (21) and the second vertical tube portion (23) are always kept isolated.

2. The high-sealing rotary kiln according to claim 1, characterized in that: During the rotation of the first impeller assembly (5), there is always at least one first receiving space (55) in communication with the first vertical tube portion (21), and there is always at least one first releasing space (56) in communication with the second vertical tube portion (23). The first receiving space (55) is formed by dividing the inner cavity of the first transverse tube portion (22) by two adjacent blades (52), and the first releasing space (56) is formed by dividing the inner cavity of the first transverse tube portion (22) by two adjacent blades (52).

3. The high-sealing rotary kiln according to claim 1, characterized in that: It also includes a spiral transmission mechanism (6), wherein a discharge end (61) of the spiral transmission mechanism (6) passes through the furnace head (12) and extends into the furnace body (1), and an outer wall of the spiral transmission mechanism (6) is sealed with an inner wall of a first feed opening (121) of the furnace head; a hopper (7), the hopper (7) being located above the spiral transmission mechanism (6); A second tube body (8), the second tube body (8) comprising a third vertical tube portion (81), a second horizontal tube portion (82), and a fourth vertical tube portion (83) which are connected and communicated in sequence, the upper opening of the third vertical tube portion (81) being sealed and connected to the outlet (71) of the hopper (7), the openings at both ends of the second horizontal tube portion (82) being sealed and connected to a third end cap and a fourth end cap, and the lower opening of the fourth vertical tube portion (83) being sealed and connected to the second feed port (62) of the spiral transmission mechanism (6); A second impeller assembly (9), wherein the second rotating shaft of the second impeller assembly (9) is rotatably assembled on the third end cover and the fourth end cover of the second transverse tube portion (82) and is coaxially arranged with the second transverse tube portion (82) and can rotate in the second transverse tube portion (82); one end of the second rotating shaft extends out of the third end cover and is connected to the second motor; during the rotation of the second impeller assembly (9), there is always a third enclosed space located on the left side of the axis of the third vertical tube portion (81), and there is always a fourth enclosed space located on the right side of the axis of the third vertical tube portion (81); the third enclosed space and the fourth enclosed space are both separated by adjacent blades on the second impeller assembly (9) in the second transverse tube portion (82) so that the third vertical tube portion (81) and the fourth vertical tube portion (83) are always kept isolated.

4. The high-sealing rotary kiln according to claim 3, characterized in that: During the rotation of the second impeller assembly (9), there is always at least one second receiving space (95) in communication with the third vertical tube portion (81), and there is always at least one second release space (96) in communication with the fourth vertical tube portion (83). The second receiving space (95) is formed by dividing the inner cavity of the second transverse tube portion (82) by two adjacent blades, and the second release space (96) is formed by dividing the inner cavity of the second transverse tube portion (82) by two adjacent blades.

5. The high-sealing rotary kiln according to claim 2, characterized in that: The first rotating shaft (51) and the first end cover (3) and the second end cover (4) are rotatably connected via a first bearing and a second bearing (13) mounted on the first end cover (3) and the second end cover (4); a packing seal (14) is provided between the first rotating shaft (51) and the first end cover (3) and the second end cover (4) in a direction in which the first bearing and the second bearing (13) face the first impeller assembly (5).

6. The high-sealing rotary kiln according to claim 4, characterized in that: The second rotating shaft and the third end cover and the fourth end cover are rotatably connected via a third bearing and a fourth bearing installed on the third end cover and the fourth end cover, and a packing seal (14) is formed between the second rotating shaft and the third end cover and the fourth end cover in a direction in which the third bearing and the fourth bearing face the second impeller assembly (9).

7. The high-sealing rotary kiln according to claim 4, characterized in that: The blades (52) of the first impeller assembly (5) and the blades of the second impeller assembly (9) are covered with polyfluoroethylene sealing strips or wear-resistant nitrile sealing strips around their peripheries.

8. The high-sealing rotary kiln according to claim 4, characterized in that: The furnace head (12) and / or the furnace tail (11) are connected to a first pressure sensor (15), a first pressure relief valve (16) and / or a second pressure sensor (17) and a second pressure relief valve (18) that are in communication with the inner cavity of the furnace (1).

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