Alumina calcination furnace flue gas treatment equipment

Abstract

The utility model relates to an alumina calcination furnace flue gas treatment equipment, including processing cylinder, the outer wall of processing cylinder upper end is equipped with drive assembly and air inlet, is equipped with connecting mechanism at air inlet cavity department, the ventilation ring is movably connected with connecting mechanism, ventilation ring upper end fixed connection from driven ring, the upper end of from driven ring is engaged connection with drive assembly, drive assembly upper end is equipped with drive ring, drive ring is equipped with the drive groove that is wavy, drive ring sliding connection piston assembly, piston assembly swing joint mixing pipeline, mixing pipeline fixed connection in the inner chamber middle part of processing cylinder, and the device can solve the problem that flue gas and limestone slurry can not fully react in the prior art through the mutual cooperation of simple annular parts and rod parts, and the simple structure makes the utility model's cost cost low, and the operation is convenient, and easy maintenance.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology for calcining furnaces, specifically to a flue gas treatment device for alumina calcining furnaces. Background Technology

[0002] The alumina calcining furnace is a key piece of equipment in alumina production, primarily used to calcine aluminum hydroxide (Al(OH)3) into alumina (Al2O3) and remove moisture and volatile impurities. The furnace is typically fueled by coal gas, natural gas, or heavy oil. During the calcination process, the combustion of these fuels produces waste gas containing varying concentrations of sulfur dioxide (SO2). Direct emission of this gas not only causes acid rain and air pollution but also violates environmental regulations. Currently, different countries have varying environmental requirements for sulfur dioxide emission concentrations in flue gas, but the overall trend is towards increasingly stringent requirements. Sulfur dioxide concentrations in flue gas should be kept as low as possible; therefore, desulfurization processes are essential for treating the waste gas, and specialized flue gas treatment equipment is used to treat the smoke and dust generated during the alumina calcination process.

[0003] Based on whether a liquid medium is used in the desulfurization process, alumina calcining furnace desulfurization processes can be divided into three main categories: wet desulfurization, dry desulfurization, and semi-dry desulfurization. Among wet desulfurization methods, the limestone-gypsum method is one of the most widely used desulfurization technologies. In this method, the flue gas from the alumina calcining furnace is passed into a limestone slurry, which then desulfurizes the gas. However, because the pipe position is fixed, the flue gas is typically introduced at a single point. This results in the flue gas continuously contacting the limestone slurry at that vertical position for desulfurization. Over time, the desulfurization effect of the limestone slurry at that vertical position decreases, leading to a reduction in the overall desulfurization efficiency of the alumina calcining furnace flue gas.

[0004] The prior art patent CN218281259U discloses an automatic control system for wet flue gas desulfurization that solves the above problems. The technical solution includes a hollow plate, a desulfurization unit, and a detection and reflux unit. A desulfurization tower is installed in the middle of the hollow plate. The desulfurization unit includes a central hole angle bar, a gas guide slip ring, a flue gas inlet pipe, a desulfurization rotary drum, a rotary drum ring, a rotary drum motor, a transmission belt, and an outlet cylinder. A central hole angle bar is installed inside the desulfurization tower. A gas guide slip ring is installed at the upper end of the central hole angle bar. A flue gas inlet pipe is installed on the left side of the fixed end of the gas guide slip ring. The upper end of the desulfurization rotary drum is connected to the inside of the rotating end of the gas guide slip ring. The rotary drum ring is installed on the desulfurization rotary drum. A guide wheel ring is installed at the upper end of the rotary drum ring. This automatic control system for wet flue gas desulfurization can pass gas containing sulfur dioxide into a desulfurizing agent such as lime slurry. The system rotates while being discharged to ensure that the gas reacts fully with the desulfurizing agent such as lime slurry. However, this technical solution uses too many precision instruments, has a complex structure, and is costly. Utility Model Content

[0005] The purpose of this invention is to provide a flue gas treatment device for alumina calcining furnace. By using this device, the problems of poor desulfurization effect, complex structure, and high cost associated with the method of introducing flue gas from alumina calcining furnace into limestone slurry, which causes the flue gas to continuously contact the limestone slurry at a vertical position for desulfurization, are solved.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an alumina calcining furnace flue gas treatment device, comprising a treatment cylinder, wherein a driving component and an air inlet are provided on the outer wall of the upper end of the treatment cylinder, and a connecting mechanism is provided in the inner cavity of the air inlet;

[0007] The connecting mechanism is movably connected to a venting ring, which includes a ring body and a retaining ring. The outer wall of the ring body is provided with a connecting hole, which communicates with the air inlet. The top and bottom ends of the ring body are fixedly connected to the retaining ring. The ring body is provided with a protrusion, and the protrusion is provided with a T-shaped vertical groove.

[0008] The outer wall of the vent ring is fixedly connected to an L-shaped vent pipe, which communicates with the air inlet. The upper end of the vent ring is fixedly connected to a driven ring, and the upper end of the driven ring is engaged with the drive assembly.

[0009] The upper end of the drive assembly is provided with a drive ring, the drive ring is provided with a wave-shaped drive groove, the drive ring is slidably connected to the piston assembly, the piston assembly is movably connected to the mixing pipe, and the mixing pipe is fixedly connected to the middle of the inner cavity of the processing cylinder.

[0010] Preferably, the processing cylinder is fixedly connected to the cover, a filter screen is movably connected between the processing cylinder and the cover, and an air outlet is provided at the top of the cover.

[0011] Preferably, the connecting mechanism includes a pair of annular plates arranged opposite each other, the annular plates having an L-shaped cross-section.

[0012] Preferably, the retaining rings are movably connected to the annular retaining plates.

[0013] Preferably, the driven ring includes a driven ring body and a concave block, a plurality of toothed blocks are fixedly provided at the top end of the driven ring body, and the driven ring body and the ring body are fixedly connected by the concave block.

[0014] Preferably, the drive assembly includes a motor, which is fixedly connected to the outer wall of the processing cylinder via a connecting block, and the output end of the motor is provided with a gear, which is located on the inner wall of the processing cylinder.

[0015] Preferably, the processing cylinder further includes a mixing pipe, which includes a central pipe, a bottom groove, side pipes, a connecting rod, and a connecting cross block. The central pipe is provided with the bottom groove, the opening of which is funnel-shaped. The side pipes are provided on both sides of the upper end of the central pipe, and the side pipes communicate with the bottom groove through the central pipe. The top end of the central pipe is fixedly connected to the connecting rod, and the top end of the connecting rod is fixedly connected to the middle of the inner cavity of the processing cylinder through the connecting cross block. The connecting cross block is located above the drive ring.

[0016] Preferably, the processing cylinder further includes a piston assembly, the piston assembly including an L-shaped rod, a T-shaped slider on the upper outer wall of the L-shaped rod, the T-shaped slider being slidably connected to the T-shaped vertical groove, a sliding shaft fixedly connected to the upper end of the L-shaped rod above the T-shaped slider, the sliding shaft being slidably connected to the drive groove, a top rod fixedly provided at the lower end of the L-shaped rod, and a piston fixedly provided at the upper end of the top rod.

[0017] Preferably, the piston is located at the opening directly below the bottom groove, and the outer wall at the lower end of the processing cylinder is provided with a feed inlet and discharge outlet.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] ① After the flue gas from the alumina calcining furnace is introduced into the treatment cylinder, the operator can start the motor. The motor output will drive the gear to rotate, and the gear will drive the driven ring to rotate through the toothed block. The driven ring will drive the ventilation ring to rotate between the annular plates. Due to the concave design of the ring, a cavity is formed between the ring and the inner wall of the treatment cylinder. At this time, no matter what angle the ring rotates to, the flue gas can still enter the L-shaped ventilation pipe through the cavity. During this process, the L-shaped ventilation pipe can rotate in annularly along the inner cavity of the treatment cylinder, so that the flue gas can contact the limestone slurry at different locations for desulfurization, which greatly improves the desulfurization effect of the flue gas from the alumina calcining furnace.

[0020] ② The drive assembly drives the piston assembly to start the operation of the mixing pipe, so that the limestone slurry in the middle of the cylinder diffuses to the edge through the bottom tank, central pipe and side pipe, realizing the reciprocating motion of the limestone slurry in the cylinder, further enabling the limestone slurry to fully react with the flue gas for desulfurization. In addition, the drive ring is wavy, which makes the L-shaped rod move up and down in the limestone slurry, driving the lower layer of slurry to fully react with the flue gas.

[0021] ③ This device can solve the problem of insufficient reaction between flue gas and limestone slurry in the prior art by using simple ring-shaped and rod-shaped parts in combination. The simple structure makes the cost of this utility model low, easy to operate and easy to maintain. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal cavity structure of the processing cylinder of this utility model;

[0024] Figure 3 This is a schematic cross-sectional view of one side of the processing cylinder of this utility model;

[0025] Figure 4 This is a schematic cross-sectional view of the other side of the processing cylinder of this utility model;

[0026] Figure 5 This is a schematic diagram of the connection mechanism structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the connection structure of the venting ring, driven ring and drive assembly of this utility model;

[0028] Figure 7 This is a schematic diagram of the piston assembly structure of this utility model;

[0029] Figure 8 This is a schematic diagram of the hybrid pipeline structure of this utility model.

[0030] Figure 9 This is a schematic diagram of the T-shaped vertical groove structure of this utility model.

[0031] In the diagram: 1. Processing cylinder; 11. Air inlet; 12. Material inlet / outlet; 2. Cover; 21. Air outlet; 3. Connecting mechanism; 31. Annular retaining plate; 4. Ventilation ring; 41. Ring body; 411. Connecting hole; 42. Retaining ring; 43. Protrusion; 431. T-shaped vertical groove; 5. L-shaped ventilation pipe; 6. Driven ring; 61. Driven ring body; 62. Tooth block; 63. Concave block; 7. Drive assembly; 71. Motor; 72. Connecting block; 73. Gear; 8. Drive ring; 81. Drive groove; 9. Mixing pipe; 91. Central pipe; 92. Bottom groove; 93. Side pipe; 94. Connecting rod; 95. Connecting cross block; 10. Piston assembly; 101. L-shaped rod; 102. T-shaped slider; 103. Sliding shaft; 104. Top rod; 105. Piston; 20. Filter screen. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1, see Figures 1-9 .

[0034] A flue gas treatment device for an alumina calcining furnace includes a treatment cylinder 1. The outer wall of the upper end of the treatment cylinder 1 is provided with a drive assembly 7 and an air inlet 11. A connecting mechanism 3 is provided in the inner cavity of the air inlet 11. A ventilation ring 4 is movably connected to the connecting mechanism 3. An L-shaped ventilation pipe 5 is fixedly connected to the outer wall of the ventilation ring 4. The ventilation pipe 5 communicates with the air inlet 11. A driven ring 6 is fixedly connected to the upper end of the ventilation ring 4. The upper end of the driven ring 6 is engaged with the drive assembly 7. A drive ring 8 is provided at the upper end of the drive assembly 7. The drive ring 8 is slidably connected to a piston assembly 10. The piston assembly 10 is movably connected to a mixing pipe 9. The mixing pipe 9 is fixedly connected to the middle of the inner cavity of the treatment cylinder 1.

[0035] The processing cylinder 1 is fixedly connected to the cover 2, and the filter screen 20 is movably connected between the processing cylinder 1 and the cover 2. The top of the cover 2 is provided with an air outlet 21.

[0036] The connecting mechanism 3 includes a pair of annular plates 31, the annular plates 31 having an L-shaped cross-section and being arranged opposite to each other.

[0037] The ventilation ring 4 includes a ring body 41 and retaining rings 42 fixedly installed on the outer periphery of the top and bottom ends of the ring body 41, respectively. The cross-section of the ring body 41 is concave, which facilitates the connection with the retaining ring 42 and the annular retaining plate 31, ensuring that the retaining ring 42 and the cylinder wall of the processing cylinder 1 form a cavity channel. The outer wall of the ring body 41 is provided with a connecting hole 411, which is connected to the air inlet 11 and the L-shaped ventilation pipe 5, respectively. This allows the flue gas to enter the L-shaped ventilation pipe 5 through the ring body 41 regardless of the rotation angle of the ring body 41. The ring body 41 is fixedly connected to the retaining ring 42, and the retaining ring 42 is movably connected to the annular retaining plate 31. The inner wall of the ring body 41 is fixedly provided with a protrusion 43, which is provided with a T-shaped vertical groove 431 for connecting the piston assembly 10.

[0038] The treatment cylinder 1 contains limestone slurry for desulfurizing the flue gas from the alumina calcining furnace. The upper and lower ends of the inner cavity of the treatment cylinder 1 are respectively provided with an air inlet 11 and a material inlet / outlet 12. The ventilation ring 4 is connected to the air inlet 11. The air inlet 11 is used to introduce the flue gas from the alumina calcining furnace into the interior of the treatment cylinder 1. The flue gas from the alumina calcining furnace enters the limestone slurry through the ventilation ring 4 and the L-shaped ventilation pipe 5 for desulfurization treatment. The lower end of the L-shaped ventilation pipe 5 is located at the lower end of the inner cavity of the treatment cylinder 1. The flue gas is discharged from the lower end of the treatment cylinder 1 and floats up with the limestone slurry, thereby achieving full desulfurization of the flue gas.

[0039] A driven ring 6 is fixedly installed on the upper end of the venting ring 4. A drive assembly 7 for driving the driven ring 6 to rotate is fixedly installed on the upper outer wall of the processing cylinder 1. The output end of the drive assembly 7 is sealed through the side wall of the processing cylinder 1. While ensuring that the output end of the drive assembly 7 can rotate, the overall sealing of the processing cylinder 1 is also ensured. The driven ring 6 is located at the upper end of the connecting mechanism 3. The driven ring 6 has a driven ring body 61 and several toothed blocks 62 that are evenly fixedly installed on the top surface of the driven ring body 61. The driven ring body 61 and the ring body 41 are fixedly connected by a concave block 63. The drive assembly 7 includes a motor 71 and a gear 73 fixedly installed on the output end of the motor 71. The motor 71 is fixedly installed on the outer wall of the processing cylinder 1 through the connecting block 72. The gear 73 is located in the inner cavity of the processing cylinder 1. The gear 73 is meshed with the toothed blocks 62.

[0040] When the motor 71 of the drive assembly 7 starts, it drives the gear 73 at the end. Because the gear 73 is meshed with the tooth block 62, the movement of the gear 73 drives the tooth block 62 to work together. The tooth block 62 drives the driven ring 61 to rotate. Since the driven ring 61 and the ring 41 are fixedly connected by the concave block 63, the rotation of the driven ring 61 drives the ring 41 to rotate as well. This drives the L-shaped ventilation pipe 5 fixedly connected to the ventilation ring 4 to rotate in the processing cylinder 1, so that the flue gas of the alumina calcining furnace can be discharged from the limestone slurry at different locations, thus improving the desulfurization effect of the flue gas of the alumina calcining furnace.

[0041] Specifically, workers inject limestone slurry into the treatment cylinder 1, keeping the slurry level below the connecting mechanism 3. Then, alumina calcining furnace flue gas is continuously injected into the limestone slurry through the air inlet 11, the ring 41, and the L-shaped ventilation pipe 5. The process of the alumina calcining furnace flue gas rising in the limestone slurry achieves desulfurization. The driven ring 6 drives the ventilation ring 4 to rotate between the annular plates 31. Due to the concave design of the ring 41, a cavity is formed between the ring 41 and the inner wall of the treatment cylinder 1. Regardless of how many times the ring 41 rotates, the flue gas can still enter the L-shaped ventilation pipe 5 through the cavity. During this process, the L-shaped ventilation pipe 5 rotates in a ring along the inner cavity of the treatment cylinder 1, allowing the flue gas to contact and desulfurize with the limestone slurry at different locations, greatly improving the desulfurization effect of the alumina calcining furnace flue gas.

[0042] The top of the cover 2 is provided with an air outlet 21 for discharging the flue gas from the desulfurized alumina calcining furnace. A filter screen 20 is installed in the upper inner cavity of the processing cylinder 1 for further filtration of the flue gas from the alumina calcining furnace.

[0043] Example 2, see Figures 1-9 .

[0044] A drive ring 8 is fixedly installed on the inner wall of the upper end of the inner cavity of the processing cylinder 1. The drive groove 81 is wavy and the drive ring 8 is located at the upper end of the driven ring 6. A mixing pipe 9 for mixing limestone slurry is fixedly installed in the middle of the inner cavity of the processing cylinder 1. The mixing pipe 9 includes a central pipe 91 and a bottom groove 92 located at the bottom of the central pipe 91. Side pipes 93 are fixedly installed on both sides of the upper end of the central pipe 91. The side pipes 93 are connected to the central pipe 91 and the bottom groove 92 respectively. A top connecting rod 94 is fixedly installed on the top surface of the central pipe 91. The connecting rod 94 is fixedly installed in the middle of the inner cavity of the processing cylinder 1 through a pair of connecting horizontal blocks 95. The connecting horizontal blocks 95 are respectively located above the drive ring 8 to prevent motion interference.

[0045] A piston assembly 10 is vertically slidably mounted on the inner side of the vent ring 4. The piston assembly 10 includes an L-shaped rod 101 and a T-shaped slider 102 fixedly mounted on the outer wall of the upper end of the L-shaped rod 101. The T-shaped slider 102 is slidably disposed in the T-shaped vertical groove 431. A sliding shaft 103 is fixedly mounted on the outer wall of the upper end of the L-shaped rod 101. The sliding shaft 103 is slidably disposed in the drive groove 81. A push rod 104 is fixedly mounted on the top surface of the lower end of the L-shaped rod 101. A piston 105 is fixedly mounted on the upper end of the push rod 104. The piston 105 is located directly below the opening of the bottom groove 92.

[0046] The drive ring 8 is used to drive the piston assembly 10 to move up and down. By moving the piston assembly 10 up and down, the limestone slurry in the mixing pipe 9 can be continuously squeezed, so that the limestone slurry can be discharged from the middle of the mixing pipe 9 to both sides, thereby achieving the mixing effect of the limestone slurry and improving the desulfurization effect of the flue gas in the alumina roasting furnace.

[0047] Specifically, when the sliding shaft 103 is at the lowest end of the drive groove 81, the piston 105 is disengaged from the bottom groove 92. When the drive assembly 7 drives the ventilation ring 4 to rotate through the driven ring 6, the ventilation ring 4 drives the piston assembly 10 to rotate through the protrusion 43 and the T-shaped slider 102. At this time, the sliding shaft 103 slides in the wave-shaped drive groove 81. Under the restriction of the drive groove 81, the piston assembly 10 can be driven to move up and down continuously. According to the principle of communicating vessels, when the piston 105 is disengaged from the bottom groove 92, the limestone slurry located in the middle of the processing cylinder 1 will fill the bottom groove 92. Since the bottom groove 92 is funnel-shaped, it is convenient for the piston 105 to enter the bottom groove 92. The limestone slurry can be continuously squeezed out from the end opening of the side pipe 93, so that the limestone slurry can be continuously circulated and mixed from the middle to the outside, so that the flue gas can continuously contact the mixed limestone slurry, improve the desulfurization effect of the flue gas, and achieve multiple functions in one machine with a high degree of automation.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas treatment device for an alumina calcining furnace, comprising a treatment cylinder (1), characterized in that: The outer wall of the upper end of the processing cylinder (1) is provided with a drive assembly (7) and an air inlet (11), and a connecting mechanism (3) is provided in the inner cavity of the air inlet (11). The connecting mechanism (3) is movably connected to a ventilation ring (4). The ventilation ring (4) includes a ring body (41) and a retaining ring (42). The outer wall of the ring body (41) is provided with a connecting hole (411), which communicates with the air inlet (11). The top and bottom ends of the ring body (41) are fixedly connected to the retaining ring (42). The ring body (41) is provided with a protrusion (43), and the protrusion (43) is provided with a T-shaped vertical groove (431). An L-shaped ventilation pipe (5) is fixedly connected to the outer wall of the ventilation ring (4). The ventilation pipe (5) is connected to the air inlet (11). A driven ring (6) is fixedly connected to the upper end of the ventilation ring (4). The upper end of the driven ring (6) is engaged with the drive assembly (7). The drive assembly (7) has a drive ring (8) at its upper end. The drive ring (8) has a wave-shaped drive groove (81). The drive ring (8) is slidably connected to the piston assembly (10). The piston assembly (10) is movably connected to the mixing pipe (9). The mixing pipe (9) is fixedly connected to the middle of the inner cavity of the processing cylinder (1).

2. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The processing cylinder (1) is fixedly connected to the cover (2), and a filter screen (20) is movably connected between the processing cylinder (1) and the cover (2). The top of the cover (2) is provided with an air outlet (21).

3. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The connecting mechanism (3) includes a pair of annular plates (31) arranged opposite to each other, the annular plates (31) having an L-shaped cross-section.

4. The alumina calcining furnace flue gas treatment equipment according to claim 3, characterized in that: The retaining ring (42) is movably connected to the annular retaining plate (31).

5. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The driven ring (6) includes a driven ring body (61) and a concave block (63). The top end of the driven ring body (61) is fixedly provided with a plurality of toothed blocks (62). The driven ring body (61) and the ring body (41) are fixedly connected by the concave block (63).

6. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The drive assembly (7) includes a motor (71), which is fixedly connected to the outer wall of the processing cylinder (1) by a connecting block (72). The output end of the motor (71) is provided with a gear (73), which is located on the inner wall of the processing cylinder (1).

7. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The processing cylinder (1) also includes a mixing pipe (9), which includes a central pipe (91), a bottom groove (92), a side pipe (93), a connecting rod (94), and a connecting block (95). The central pipe (91) is provided with the bottom groove (92), and the opening of the bottom groove (92) is trumpet-shaped. The side pipes (93) are provided on both sides of the upper end of the central pipe (91). The side pipes (93) are connected to the bottom groove (92) through the central pipe (91). The top end of the central pipe (91) is fixedly connected to the connecting rod (94). The top end of the connecting rod (94) is fixedly connected to the middle of the inner cavity of the processing cylinder (1) through the connecting block (95). The connecting block (95) is located above the drive ring (8).

8. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The processing cylinder (1) further includes a piston assembly (10), which includes an L-shaped rod (101). The upper outer wall of the L-shaped rod (101) is provided with a T-shaped slider (102). The T-shaped slider (102) is slidably connected to the T-shaped vertical groove (431). Above the T-shaped slider (102) is a sliding shaft (103) fixedly connected to the upper end of the L-shaped rod (101). The sliding shaft (103) is slidably connected to the drive groove (81). The lower end of the L-shaped rod (101) is fixedly provided with a top rod (104), and the upper end of the top rod (104) is fixedly provided with a piston (105).

9. The alumina calcining furnace flue gas treatment equipment according to claim 1, characterized in that: The outer wall at the lower end of the processing cylinder (1) is provided with a material inlet and outlet (12).

Images