Aluminum oxide roasting furnace feeding device capable of utilizing flue gas waste heat

Abstract

The invention discloses an aluminum oxide roasting furnace feeding device capable of utilizing flue gas waste heat, and relates to the technical field of roasting furnace feeding devices.The aluminum oxide roasting furnace feeding device comprises a barrel, a feeding port and a discharging port, a rotating shaft is rotationally arranged in the barrel, two blocking plates are fixedly arranged on the rotating shaft, and an exhaust cavity and an air inlet cavity are formed in the positions, located on the outer sides of the two blocking plates, in the barrel respectively; the feeding device comprises a rotating shaft, the rotating shaft is fixedly provided with a spiral packing auger, a flue is formed in the spiral packing auger, the two ends of the flue are located on the outer sides of the two plugging plates and communicate with the exhaust cavity and the air inlet cavity correspondingly, and the feeding device further comprises a cleaning piece used for cleaning the flue. According to the spiral auger, the heat loss is reduced, materials can be heated from the interior by introducing smoke into the spiral auger, the heating effect of the materials is improved, a flue in the spiral auger can be cleaned through the cleaning piece, and the heat dissipation effect of the spiral auger is improved.

Description

Technical Field

[0001] The invention relates to the technical field of a roasting furnace feeding device, in particular to an alumina roasting furnace feeding device capable of utilizing flue gas waste heat. Background Art

[0002] In the process of aluminum oxide production, roasting is a necessary and main process. During roasting, a feeding device is usually used to feed the aluminum oxide roasting system. For example, in the invention patent with the announcement number CN115468410B, a feeding device for an aluminum hydroxide roasting furnace is disclosed, including a conveying trough for feeding connected to the venturi dryer of the aluminum hydroxide roasting furnace, and the conveying trough is provided with a spiral conveying mechanism; the discharge end of the spiral conveying mechanism is connected to a bulk material paddle wheel, and the bulk material paddle wheel is located in the venturi dryer of the aluminum hydroxide roasting furnace; However, alumina roasting accounts for one-third of the energy consumption of the entire alumina production. A large amount of flue gas will be generated during roasting. The waste gas after treatment still has a certain temperature. Directly discharging the flue gas will cause energy waste. Before aluminum hydroxide is sent into the roasting system through the feeding device, it will contain about 3% moisture and the temperature is relatively low. Directly entering the roasting system will increase energy consumption. Figure 7 As shown, if the exhaust flue gas can be used to heat and dry the aluminum hydroxide entering the roasting system, the energy consumption can be reduced. In order to achieve the above purpose, providing a feeding device that can heat the material through flue gas is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides an alumina roasting furnace feeding device that can utilize the waste heat of flue gas, so that the flue gas can directly enter the feeding device to heat the material without the aid of a heat exchange medium, thereby reducing heat loss. By passing the flue gas into a spiral auger, the material can be heated from the inside, thereby improving the heating effect of the material.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a feeding device for an alumina roasting furnace that can utilize the waste heat of flue gas, comprises a cylinder, a feed port and a discharge port. A rotating shaft is rotatably arranged in the cylinder, and two sealing plates are fixedly arranged on the rotating shaft. The inner surface of the cylinder is located at the outside of the feed port and the discharge port and two grooves are arranged. The two sealing plates are rotatably installed in the two grooves. An exhaust chamber and an air intake chamber are formed in the cylinder at the outsides of the two sealing plates, respectively. A spiral auger is fixedly arranged on the rotating shaft, and a flue is opened in the spiral auger. The two ends of the flue are located at the outsides of the two sealing plates and are respectively connected with the exhaust chamber and the air intake chamber, the exhaust chamber is connected to a first exhaust pipe, and the air intake chamber is connected to a first air intake pipe. The feeding device also includes a cleaning piece for cleaning the flue. When the flue needs to be cleaned, the cleaning piece is placed in the flue. When the rotating shaft drives the spiral auger to rotate, the cleaning piece can move in the flue by its own weight.

[0005] Preferably, the cleaning member comprises a spiral slider, which is in a fan-shaped spiral shape and can slide freely in the flue, the angle between the planes at both ends of the spiral slider is not greater than 180 degrees, and the spiral slider is made of stainless steel.

[0006] Preferably, both end planes of the spiral slider are provided with grooves, the cross-section of the groove is trapezoidal, and the four sides of the groove form cleaning edges.

[0007] Preferably, openings are provided above the air inlet cavity and the air exhaust cavity, and covers are hingedly connected to the outer sides of the openings.

[0008] Preferably, the outer side of the cylinder is covered with an outer sleeve, one side above the outer sleeve is connected to a second air inlet pipe, and the other side below the outer sleeve is connected to a second exhaust pipe, and an interlayer that allows smoke to flow is formed between the outer sleeve and the cylinder to heat the outer wall of the cylinder.

[0009] Preferably, the outer sleeve is composed of two semicircular cylinders, and the two semicircular cylinders are connected together using a plurality of bolts.

[0010] Preferably, one end of the rotating shaft extends to the outside of the cylinder through a connecting shaft, a reducer is fixedly arranged on the outside of the cylinder, the connecting shaft is connected to the power output end of the reducer, and the power input end of the reducer is connected to a motor.

[0011] The present invention provides an alumina roasting furnace feeding device that can utilize the waste heat of flue gas, and has the following beneficial effects: the device can allow the flue gas to directly enter the feeding device for heat exchange without the aid of a heat exchange medium, thereby reducing heat loss; by passing the flue gas into the spiral auger, the material can be heated from the inside, thereby improving the heating effect of the material; by providing an outer sleeve, the side wall of the cylinder can also be heated, thereby achieving heating of the material through the cylinder, further improving the heat exchange efficiency; the flue in the spiral auger can be cleaned by a cleaning piece, thereby improving the heat dissipation effect of the spiral auger. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A perspective view of the present invention; Figure 2 It is a three-dimensional exploded view of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a three-dimensional diagram of the spiral slider; Figure 5 It is a side view of the spiral slider; Figure 6 for Figure 5 Sectional view of middle AA; Figure 7 This is a diagram of the alumina roasting system.

[0013] In the figure: 1. cylinder; 2. rotating shaft; 3. sealing plate; 4. groove; 5. spiral auger; 6. flue; 7. exhaust chamber; 8. air inlet chamber; 9. first exhaust pipe; 10. first air inlet pipe; 11. feed port; 12. discharge port; 13. outer sleeve; 14. second air inlet pipe; 15. second exhaust pipe; 16. opening; 17. cover plate; 18. connecting shaft; 19. reducer; 20. motor; 21. spiral slider; 22. cleaning blade. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0015] See also Figure 1-6The present invention provides a technical solution: a feeding device for an alumina roasting furnace capable of utilizing waste heat from flue gas, comprising a barrel 1 for conveying materials, a feed port 11 and a discharge port 12, a rotating shaft 2 is rotatably arranged in the barrel 1, two sealing plates 3 are fixedly arranged on the rotating shaft 2, two grooves 4 are arranged on the inner surface of the barrel 1 at the outside of the feed port 11 and the discharge port 12, the two sealing plates 3 are rotatably installed in the two grooves 4, a sealing gasket is arranged in the groove 4, an exhaust cavity 7 and an intake cavity 8 are respectively formed on the outside of the two sealing plates 3 in the barrel 1, a feeding cavity is formed between the two sealing plates 3, a spiral auger 5 is fixedly arranged on the rotating shaft 2, the spiral auger 5 can be driven by the rotating shaft 2 to rotate to realize conveying the material to the discharge port 12, a flue 6 is opened in the spiral auger 5, and the two ends of the flue 6 are located on the outside of the two sealing plates 3 And they are respectively connected with the exhaust chamber 7 and the air intake chamber 8. The exhaust chamber 7 is connected with a first exhaust pipe 9, and the air intake chamber 8 is connected with a first air intake pipe 10. The smoke can enter the air intake chamber 8 through the first air intake pipe 10, and the smoke in the air intake chamber 8 can enter the spiral auger 5 through one end of the flue 6 to heat the spiral auger 5. Then the smoke can be discharged into the exhaust chamber 7 through the other end of the flue 6, and finally discharged through the first exhaust pipe 9. The feeding device also includes a cleaning part for cleaning the flue 6. As the smoke flows in the flue 6 for a long time, a large amount of dust will adhere to its inner wall. When the thickness is large, it will affect the heat dissipation of the spiral auger 5. When the flue 6 needs to be cleaned, the cleaning part is placed in the flue 6. When the rotating shaft 2 drives the spiral auger 5 to rotate, the cleaning part can move in the flue 6 by its own weight, thereby cleaning the inner wall of the flue 6.

[0016] As an embodiment of the present invention, the cleaning piece includes a spiral slider 21, which is fan-shaped and can slide freely in the flue 6. The angle between the planes at both ends of the spiral slider 21 is not greater than 180 degrees, ensuring that the spiral slider 21 can always be below the spiral auger 5 when the spiral auger 5 rotates. The spiral slider 21 is made of stainless steel to increase its own weight.

[0017] As an embodiment of the present invention, grooves 4 are provided on both end planes of the spiral slider 21 . The cross section of the groove 4 is trapezoidal. The four sides of the groove 4 form cleaning blades 22 to facilitate cleaning of relatively hard attachments in the flue 6 .

[0018] As an embodiment of the present invention, openings 16 are provided above the air inlet chamber 8 and the exhaust chamber 7, and a cover plate 17 is hingedly connected to the outer side of the opening 16. By opening the cover plate 17, the cleaning piece can be placed into one end of the flue or taken out from the other end of the flue.

[0019] As an embodiment of the present invention, the outer side of the cylinder 1 is covered with an outer sleeve 13, and a second air inlet pipe 14 is connected to one side above the outer sleeve 13, and a second exhaust pipe 15 is connected to the other side below the outer sleeve 13. An interlayer that allows smoke to flow is formed between the outer sleeve 13 and the cylinder 1, thereby heating the outer wall of the cylinder 1.

[0020] As an embodiment of the present invention, the outer sleeve 13 is composed of two semicircular cylinders, which are connected together by multiple bolts. The outer sleeve 13 can be removed by removing the bolts to facilitate cleaning of dust inside it.

[0021] As an embodiment of the present invention, one end of the rotating shaft 2 extends to the outside of the cylinder 1 through the connecting shaft 18, a reducer 19 is fixedly arranged on the outside of the cylinder 1, the connecting shaft 18 is connected to the power output end of the reducer 19, and the power input end of the reducer 19 is connected to the motor 20.

[0022] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and no longer explains the electrical control.

[0023] The working principle and use process of the present invention are as follows: when in use, the first air inlet pipe 10 and the second air inlet pipe 14 are connected to the smoke supply pipeline, and a fan can also be arranged on the smoke supply pipeline to increase the flow speed of the smoke, and the feed port 11 is connected to the material supply pipeline, and the motor 20 is started to rotate the shaft 2, and the material entering the cylinder 1 can be transported to the side of the discharge port 12 through the rotation of the shaft 2, and the material can be discharged from the cylinder 1 through the discharge port 12, so as to realize the transportation of the material, and a part of the smoke enters the air inlet cavity 8 through the first air inlet pipe 10, and the smoke in the air inlet cavity 8 can enter the spiral auger 5 through one end of the flue 6, so as to realize the heating of the spiral auger 5, and the transported material can be heated by the spiral auger 5 with temperature, and the spiral auger can be heated from the inside Hot materials, improving the heating effect of the materials, finally the smoke in the flue 6 enters the exhaust chamber 7 and is discharged through the first exhaust pipe 9, and the other part of the smoke enters the outer sleeve 13 through the second air inlet pipe 14, so as to heat the outer wall of the cylinder 1, and then heat the materials transported in the cylinder 1 through the outer wall of the cylinder 1; opening the cover 17 can insert the spiral slider 21 into one end of the flue 6, and starting the motor 20 can make the spiral auger 5 rotate. Since the spiral slider 21 is fan-shaped and matches the inside of the flue 6, the spiral slider 21 can always be under the spiral auger by its own weight. When the spiral auger 5 rotates, the spiral slider 21 can move from one end of the flue 6 to the other end, that is, one cleaning is completed. By regularly cleaning the inner wall of the flue 6, the heat dissipation effect of the spiral auger 5 can be improved.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A feeding device for an alumina roasting furnace capable of utilizing waste heat from flue gas, comprising a cylinder (1), a feeding port (11) and a discharging port (12), characterized in that: A rotating shaft (2) is rotatably arranged in the cylinder (1), and two blocking plates (3) are fixedly arranged on the rotating shaft (2). Two grooves (4) are arranged on the inner surface of the cylinder (1) on the outer sides of the feed port (11) and the discharge port (12), and the two blocking plates (3) are rotatably installed in the two grooves (4). An exhaust cavity (7) and an intake cavity (8) are respectively formed on the outer sides of the two blocking plates (3) in the cylinder (1). A spiral auger (5) is fixedly arranged on the rotating shaft (2), and the spiral auger (5) has a plurality of inner grooves (4) and a plurality of inner grooves (4) formed therein. A flue (6) is provided, the two ends of the flue (6) being located outside the two blocking plates (3) and being respectively connected to the exhaust chamber (7) and the air intake chamber (8); the exhaust chamber (7) being connected to a first exhaust pipe (9); the air intake chamber (8) being connected to a first air intake pipe (10); the feeding device further comprising a cleaning member for cleaning the flue (6); when the flue (6) needs to be cleaned, the cleaning member is placed in the flue (6); when the rotating shaft (2) drives the spiral auger (5) to rotate, the cleaning member can move in the flue (6) by its own weight.

2. The alumina roasting furnace feeding device capable of utilizing flue gas waste heat according to claim 1, characterized in that: The cleaning member comprises a spiral slider (21), which is in a fan-shaped spiral shape and can slide freely in the flue (6). The angle between the two end planes of the spiral slider (21) is no greater than 180 degrees, and the spiral slider (21) is made of stainless steel.

3. The alumina roasting furnace feeding device capable of utilizing flue gas waste heat according to claim 2, characterized in that: The two end planes of the spiral slider (21) are both provided with grooves (4), the cross section of the groove (4) is trapezoidal, and the four sides of the groove (4) form cleaning blades (22).

4. The alumina roasting furnace feeding device capable of utilizing flue gas waste heat according to claim 1, characterized in that: An opening (16) is provided above the air inlet cavity (8) and the air outlet cavity (7), and a cover plate (17) is hingedly connected to the outer side of the opening (16).

5. The alumina roasting furnace feeding device capable of utilizing flue gas waste heat according to claim 1, characterized in that: The outer side of the cylinder (1) is covered with an outer sleeve (13); the upper side of the outer sleeve (13) is connected to a second air inlet pipe (14); the lower side of the outer sleeve (13) is connected to a second air outlet pipe (15); an interlayer capable of allowing smoke to flow is formed between the outer sleeve (13) and the cylinder (1), thereby achieving heating of the outer wall of the cylinder (1).

6. The alumina roasting furnace feeding device capable of utilizing flue gas waste heat according to claim 5, characterized in that: The outer sleeve (13) is composed of two semicircular cylinders, and the two semicircular cylinders are connected together using a plurality of bolts.

7. The alumina roasting furnace feeding device capable of utilizing flue gas waste heat according to claim 1, characterized in that: One end of the rotating shaft (2) extends to the outside of the cylinder (1) through a connecting shaft (18); a reducer (19) is fixedly arranged on the outside of the cylinder (1); the connecting shaft (18) is connected to the power output end of the reducer (19); and the power input end of the reducer (19) is connected to a motor (20).

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