Tail gas recovery and treatment device for waste alumina recovery

Abstract

The present invention discloses a tail gas recovery and treatment device for waste aluminum oxide recovery, comprising a tail gas discharge pipe and a steam discharge pipe interconnected with the bottom of the tail gas discharge pipe, the air inlet port of the tail gas discharge pipe is provided with a first check valve, the air outlet port of the steam discharge pipe is provided with a second check valve, the interior of the tail gas discharge pipe is provided with a filter assembly located between the first check valve and the steam discharge pipe, the filter assembly is vertically tilted forward; the inner wall of the steam discharge pipe is slidably connected with a movable cylinder, the inner top wall of the tail gas discharge pipe is provided with a water reservoir and a guide bevel groove, and the guide bevel groove is located directly above the air outlet port of the steam discharge pipe. The present invention can recycle hot steam, and use hot steam to achieve secondary purification of the filter assembly. Under the secondary purification, the filter assembly can be automatically cleaned, which greatly reduces the manual disassembly and cleaning of the filter assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a tail gas recovery and treatment device for recovering waste aluminum oxide. Background Art

[0002] During the alumina roasting process, for every ton of alumina produced, 1.534 tons of aluminum hydroxide and 0.081 tons of aluminum hydroxide attached water need to be added to the system. After roasting, the aluminum hydroxide attached water and crystallization water totaling 0.612 tons are converted into superheated water vapor and enter the exhaust gas, and then discharged out of the system.

[0003] In addition, 2.85 kg of the alumina obtained by roasting is lost in the form of mechanical loss, and 0.15 kg of alumina is lost to the environment in the form of waste gas dust. In order to improve the recovery rate of alumina in the roasting process, it is necessary not only to consider reducing the mechanical loss of the roasting process, but also to recover the dust-containing waste gas.

[0004] In the prior art, the dust-containing waste gas recovered from alumina is mostly filtered by a filter. However, in actual applications, the filter is easily clogged by the mixture of dust and alumina when filtering the dust-containing waste gas. Therefore, the filter needs to be disassembled and cleaned frequently, which is not only complicated to operate, but also affects the emission of waste gas. Summary of the invention

[0005] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0006] A tail gas recovery and treatment device for waste aluminum oxide recovery comprises a tail gas discharge pipe and a steam discharge pipe interconnected with the bottom of the tail gas discharge pipe, the air inlet port of the tail gas discharge pipe is provided with a first check valve, the air outlet port of the steam discharge pipe is provided with a second check valve, a filter assembly located between the first check valve and the steam discharge pipe is installed inside the tail gas discharge pipe, and the filter assembly is arranged vertically forwardly; a movable cylinder is slidably connected to the inner wall of the steam discharge pipe, a water reservoir and a guide inclined groove are provided on the inner top wall of the tail gas discharge pipe, and the guide inclined groove is located directly above the air outlet port of the steam discharge pipe;

[0007] Exhaust gas enters the exhaust pipe from the air inlet port, is filtered by the filter assembly, and is discharged from the exhaust pipe outlet port. Hot steam enters the exhaust pipe from the air inlet port of the steam exhaust pipe to purify the filter assembly once. Part of the hot steam entering the inner cavity of the exhaust pipe condenses into water droplets, which fall into the water reservoir along the guide slope groove for storage. When the water droplets in the water reservoir accumulate to a set amount, it automatically opens to clean and water the filter assembly, thereby achieving secondary purification of the filter assembly.

[0008] As a preferred embodiment of the above technical solution, a liquid adding mechanism is installed on the inner wall of the steam exhaust pipe, and the liquid adding mechanism is located above the movable cylinder.

[0009] As a preferred embodiment of the above technical solution, the liquid adding mechanism includes a liquid storage tank fixedly connected to the inner wall of the steam exhaust pipe, the liquid storage tank is interconnected with a liquid inlet pipe, the inner cavity of the liquid storage tank is movably connected with a matching piston column, the piston column is provided with a column through hole, the liquid storage tank is provided with a connecting hole, and when the bottom of the piston column and the bottom of the liquid storage tank are flush, the column through hole and the connecting hole are connected.

[0010] As a preferred embodiment of the above technical solution, the movable cylinder is trumpet-shaped, a flow guide is fixedly connected to the inner wall of the movable cylinder, a stop column is fixedly connected to the movable cylinder, and the top of the stop column supports the bottom of the piston column.

[0011] As a preferred embodiment of the above technical solution, the upper inclined surface on the top surface and the lower inclined surface on the bottom surface of the liquid inlet pipe are in the shape of conical surfaces arranged opposite to each other, and a guide hole is provided at the connection portion between the upper inclined surface and the lower inclined surface.

[0012] As a preferred embodiment of the above technical solution, the bottom of the water reservoir is rotatably connected to a bottom plate via an elastic shaft, and magnetic suction components are provided at the bottom plate and the opening of the water reservoir.

[0013] As a preferred embodiment of the above technical solution, a liquid viewing hole is opened on the outer wall of the steam exhaust pipe, and the liquid viewing hole faces the liquid storage tank.

[0014] As a preferred embodiment of the above technical solution, the outlet direction of the column through hole is toward the middle of the inner cavity of the steam exhaust pipe. When the column through hole and the connecting hole are connected, the liquid in the inner cavity of the liquid storage tank drips onto the upper inclined surface along the column through hole and the connecting hole.

[0015] As a preferred embodiment of the above technical solution, the filter assembly includes an outer frame fixedly connected to the inner wall of the exhaust pipe, a filter screen is detachably slidably mounted on the outer frame, a mounting plate is fixedly connected to the bottom of the filter screen, and the mounting plate is fixed to the bottom wall of the exhaust pipe by bolts.

[0016] The beneficial effects of the present invention are:

[0017] 1. Hot steam enters the inner cavity of the tail gas exhaust pipe through the movable cylinder from the air inlet port of the steam exhaust pipe. The hot steam entering the inner cavity of the tail gas exhaust pipe will reach the position of the filter assembly. Under the action of the hot steam, the dust and aluminum oxide mixture retained on the filter assembly can be softened and humidified. The softened and humidified mixture falls along the filter assembly to the bottom of the inner cavity of the tail gas exhaust pipe, thereby achieving a primary purification of the filter assembly; at the same time, part of the hot steam condenses into water droplets and falls along the guide slope groove to the water reservoir for storage. When the water droplets in the water reservoir accumulate to a set amount, it will automatically open to clean and water the filter assembly, thereby achieving a secondary purification of the filter assembly. The present invention can achieve automatic cleaning of the filter assembly under two purifications, greatly reducing the manual disassembly and cleaning of the filter assembly.

[0018] 2. A liquid adding mechanism is installed on the inner wall of the steam discharge pipe, and the liquid adding mechanism is located above the movable cylinder; by setting up the liquid adding mechanism, when the steam discharge pipe discharges hot steam, it can cooperate with the movable cylinder to automatically transport and mix with the hot steam, thereby further improving the purification effect of the filter component. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure shows a three-dimensional structure diagram of a tail gas recovery and treatment device for waste aluminum oxide recovery in the present invention;

[0020] Figure 2 The figure shows a front view of the structure cutaway diagram of the waste aluminum oxide recovery device in the present invention when the steam discharge pipe of the tail gas recovery device is not discharging hot steam;

[0021] Figure 3 It shows Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 It shows Figure 2 Enlarged view of point C in the middle;

[0023] Figure 5 The figure shows a cross-sectional view of a movable cylinder in a tail gas recovery and treatment device for waste aluminum oxide recovery in the present invention;

[0024] Figure 6 The figure shows a three-dimensional structure diagram of an outer frame and a filter screen in a tail gas recovery and treatment device for waste aluminum oxide recovery in the present invention;

[0025] Figure 7 The figure shows a front view of the structure cutaway diagram of the waste aluminum oxide recovery device in the present invention when the steam discharge pipe discharges hot steam;

[0026] Figure 8 It shows Figure 7 Enlarged view of point B in the middle.

[0027] 10. Exhaust pipe; 11. First check valve; 12. Guide slope groove; 20. Steam exhaust pipe; 21. Second check valve; 31. Water reservoir; 32. Bottom plate; 33. Magnetic assembly; 40. Filter assembly; 41. Outer frame; 42. Filter screen; 43. Mounting plate; 51. Movable cylinder; 52. Guide piece; 521. Upper slope; 522. Lower slope; 523. Guide hole; 53. Column; 60. Liquid adding mechanism; 61. Liquid storage tank; 62. Liquid inlet pipe; 621. Connecting hole; 63. Piston column; 631. Column through hole; 64. Liquid viewing hole. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0029] Example

[0030] like Figure 1 , Figure 2 As shown, the tail gas recovery and treatment device for waste alumina recovery includes a tail gas discharge pipe 10 and a steam discharge pipe 20 interconnected with the bottom of the tail gas discharge pipe 10, the air inlet port of the tail gas discharge pipe 10 is provided with a first check valve 11, the air outlet port of the steam discharge pipe 20 is provided with a second check valve 21, and the interior of the tail gas discharge pipe 10 is installed with a filter assembly 40 located between the first check valve 11 and the steam discharge pipe 20, and the filter assembly 40 is arranged vertically and tilted forward;

[0031] like Figure 3 As shown, the inner wall of the steam exhaust pipe 20 is slidably connected with a movable cylinder 51;

[0032] like Figure 2 , Figure 4 As shown, the inner top wall of the tail gas exhaust pipe 10 is provided with a water reservoir 31 and a guide slope groove 12, and the guide slope groove 12 is located directly above the gas outlet port of the steam exhaust pipe 20;

[0033] The tail gas intermittently enters from the air inlet port of the tail gas exhaust pipe 10, is filtered by the filter assembly 40 and discharged from the air outlet port of the tail gas exhaust pipe 10, and the dust and aluminum oxide mixture are blocked and retained on the filter assembly 40;

[0034] The hot steam enters the inner cavity of the tail gas exhaust pipe 10 through the movable cylinder 51 from the air inlet port of the steam exhaust pipe 20. The hot steam entering the inner cavity of the tail gas exhaust pipe 10 reaches the position of the filter assembly 40. Under the action of the hot steam, the dust and aluminum oxide mixture retained on the filter assembly 40 can be softened and humidified. The softened and humidified mixture falls along the filter assembly 40 to the bottom of the inner cavity of the tail gas exhaust pipe 10, thereby achieving a primary purification of the filter assembly 40; at the same time, part of the hot steam condenses into water droplets and falls along the guide inclined groove 12 to the water reservoir 31 for storage. When the water droplets in the water reservoir 31 accumulate to a set amount, it will automatically open, thereby cleaning and pouring the filter assembly 40, thereby achieving a secondary purification of the filter assembly 40. The present invention can achieve automatic cleaning of the filter assembly 40 under two purifications, greatly reducing the manual disassembly and cleaning of the filter assembly 40.

[0035] like Figure 3 , Figure 5As shown, a liquid adding mechanism 60 is installed on the inner wall of the steam discharge pipe 20, and the liquid adding mechanism 60 is located above the movable cylinder 51; by setting the liquid adding mechanism 60, when the steam discharge pipe 20 discharges hot steam, it can cooperate with the movable cylinder 51 to automatically transport and mix with the hot steam, thereby further improving the purification effect of the filter component 40.

[0036] The liquid adding mechanism 60 comprises a liquid storage tank 61 fixedly connected to the inner wall of the steam exhaust pipe 20, a liquid inlet pipe 62 is interconnected on the liquid storage tank 61, a piston column 63 is movably inserted into the inner cavity of the liquid storage tank 61, a column through hole 631 is provided on the piston column 63, a connecting hole 621 is provided on the liquid storage tank 61, and when the bottom of the piston column 63 is flush with the bottom of the liquid storage tank 61, the column through hole 631 and the connecting hole 621 are connected. The movable cylinder 51 is in the shape of a trumpet, a flow guide 52 is fixedly connected to the inner wall of the movable cylinder 51, a support column 53 is fixedly connected to the movable cylinder 51, and the top of the support column 53 supports the bottom of the piston column 63; the upper inclined surface 521 on the top surface and the lower inclined surface 522 on the bottom surface are in the shape of conical surfaces arranged opposite to each other, and a flow guide hole 523 is provided at the connection between the upper inclined surface 521 and the lower inclined surface 522. The outlet direction of the column through hole 631 is toward the middle of the inner cavity of the steam exhaust pipe 20. When the column through hole 631 and the connecting hole 621 are connected, the liquid in the inner cavity of the liquid storage tank 61 drips onto the upper inclined surface 521 along the column through hole 631 and the connecting hole 621.

[0037] The working principle of the liquid adding mechanism 60 and the movable cylinder 51 is as follows: when there is no hot steam discharged from the steam discharge pipe 20, under the action of gravity, the piston rod 63 and the movable cylinder 51 are both at the bottom, that is, Figure 3 As shown, at this time, the column through hole 631 and the connecting hole 621 are not connected, and the cleaning liquid in the inner cavity of the liquid storage box 61 does not want to be discharged. When hot steam is discharged from the steam discharge pipe 20, since the movable cylinder 51 is trumpet-shaped and the provided guide member 52 further reduces the conveying cross-sectional area of ​​the hot steam, the hot steam gives the movable cylinder 51 and the guide member 52 an upward supporting force to drive the movable cylinder 51 to rise. The movable cylinder 51 rises and drives the piston column 63 to rise under the action of the stop column 53, so that the column through hole 631 and the connecting hole 621 are connected, that is, Figure 7 , Figure 8 As shown, at this time, the cleaning liquid in the inner cavity of the liquid storage tank 61 is transported outward through the column through hole 631 and the connecting hole 621, and then drips onto the connecting hole 621, and falls into 623 under the action of the inclined surface of the connecting hole 621. At the same time, the transportation cross-sectional area of ​​the hot steam is reduced and the upward discharge rate of the hot steam in 623 is increased, so that the hot steam can be better mixed with the cleaning liquid to form clean steam, thereby further improving the purification effect of the filter component 40.

[0038] like Figure 4As shown, the bottom of the water reservoir 31 is rotatably connected with a bottom plate 32 through an elastic shaft, and a magnetic attraction component 33 is provided at the bottom plate 32 and the opening of the water reservoir 31. The hot steam condenses into water droplets and falls into the water reservoir 31 along the guide slope groove 12 for storage. When the water stored in the water reservoir 31 reaches a certain weight and exceeds the magnetic attraction of the magnetic attraction component 33, the bottom plate 32 rotates around the elastic shaft to automatically open the bottom plate 32, and the water stored in the water reservoir 31 cleans and waters the filter component 40. After the water in the water reservoir 31 is released, the bottom plate 32 automatically returns to the initial position around the elastic shaft under the action of the elastic shaft, and the bottom plate 32 and the opening of the water reservoir 31 are magnetically attracted again under the action of the magnetic attraction component 33.

[0039] like Figure 1 , Figure 3 As shown, the outer wall of the steam exhaust pipe 20 is provided with a liquid viewing hole 64, and the liquid viewing hole 64 is directly opposite to the liquid storage tank 61. The liquid storage tank 61 is made of a transparent material, and the staff can observe the remaining amount of cleaning liquid in the inner cavity of the liquid storage tank 61 through the liquid viewing hole 64, so as to facilitate timely addition from the liquid inlet pipe 62.

[0040] like Figure 2 , Figure 4 As shown, the filter assembly 40 includes an outer frame 41 fixedly connected to the inner wall of the exhaust pipe 10, a filter screen 42 is detachably slidably mounted on the outer frame 41, a mounting plate 43 is fixedly connected to the bottom of the filter screen 42, and the mounting plate 43 is fixed to the bottom wall of the exhaust pipe 10 by bolts. In the present invention, the dust and aluminum oxide mixture on the secondary purification filter screen 42 fall to the bottom of the inner cavity of the exhaust pipe 10, and when the filter screen 42 is manually replaced, the dust and aluminum oxide mixture can be cleaned and collected through the mounting hole of the filter screen 42.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A tail gas recovery and treatment device for waste alumina recovery, comprising a tail gas discharge pipe (10) and a steam discharge pipe (20) interconnected with the bottom of the tail gas discharge pipe (10), the air inlet port of the tail gas discharge pipe (10) is provided with a first check valve (11), the air outlet port of the steam discharge pipe (20) is provided with a second check valve (21), a filter assembly (40) is installed inside the tail gas discharge pipe (10) and is located between the first check valve (11) and the steam discharge pipe (20), characterized in that: The filter assembly (40) is arranged vertically and tilted forward; the inner wall of the steam exhaust pipe (20) is slidably connected to a movable cylinder (51); the inner top wall of the exhaust pipe (10) is provided with a water reservoir (31) and a guide bevel groove (12), and the guide bevel groove (12) is located directly above the gas outlet port of the steam exhaust pipe (20); Exhaust gas enters the exhaust pipe (10) from the air inlet port, is filtered by the filter assembly (40), and is discharged from the exhaust pipe (10) from the air outlet port. Hot steam enters the exhaust pipe (10) from the air inlet port of the steam exhaust pipe (20) to achieve primary purification of the filter assembly (40). Part of the hot steam entering the inner cavity of the exhaust pipe (10) condenses into water droplets, which fall into the water reservoir (31) along the guide inclined groove (12) for storage. When the water droplets in the water reservoir (31) accumulate to a set amount, the water reservoir (31) is automatically opened to clean and water the filter assembly (40), thereby achieving secondary purification of the filter assembly (40). A liquid adding mechanism (60) is installed on the inner wall of the steam discharge pipe (20), and the liquid adding mechanism (60) is located above the movable cylinder (51); The liquid adding mechanism (60) comprises a liquid storage box (61) fixedly connected to the inner wall of the steam exhaust pipe (20), the liquid storage box (61) is interconnected with a liquid inlet pipe (62), the inner cavity of the liquid storage box (61) is movably connected with a matching piston column (63), the piston column (63) is provided with a column through hole (631), the liquid storage box (61) is provided with a communication hole (621), and when the bottom of the piston column (63) and the bottom of the liquid storage box (61) are flush, the column through hole (631) and the communication hole (621) are connected; The movable cylinder (51) is trumpet-shaped, a flow guide (52) is fixedly connected to the inner wall of the movable cylinder (51), a support column (53) is fixedly connected to the movable cylinder (51), and the top of the support column (53) supports the bottom of the piston column (63); The upper inclined surface (521) on the top surface and the lower inclined surface (522) on the bottom surface of the liquid inlet pipe (62) are in the shape of conical surfaces arranged opposite to each other, and a guide hole (523) is provided at the connection portion between the upper inclined surface (521) and the lower inclined surface (522).

2. The tail gas recovery and treatment device for waste aluminum oxide recovery according to claim 1, characterized in that: The bottom of the water reservoir (31) is rotatably connected to a bottom plate (32) via an elastic rotating shaft, and a magnetic attraction component (33) is provided at the bottom plate (32) and the opening of the water reservoir (31).

3. The tail gas recovery and treatment device for waste aluminum oxide recovery according to claim 1, characterized in that: The outer wall of the steam discharge pipe (20) is provided with a liquid viewing hole (64), and the liquid viewing hole (64) faces the liquid storage tank (61).

4. The tail gas recovery and treatment device for waste aluminum oxide recovery according to claim 1, characterized in that: The outlet direction of the column through hole (631) is toward the middle of the inner cavity of the steam exhaust pipe (20); when the column through hole (631) and the communication hole (621) are connected, liquid in the inner cavity of the liquid storage tank (61) drips onto the upper inclined surface (521) along the column through hole (631) and the communication hole (621).

5. The tail gas recovery and treatment device for waste aluminum oxide recovery according to claim 1, characterized in that: The filter assembly (40) comprises an outer frame (41) fixedly connected to the inner wall of the exhaust gas emission pipe (10), a filter screen (42) being detachably slidably mounted on the outer frame (41), a mounting plate (43) being fixedly connected to the bottom of the filter screen (42), and the mounting plate (43) being fixed to the bottom wall of the exhaust gas emission pipe (10) by means of bolts.

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