A hot air recycling and recovery device for alumina production with waste gas purification function

Abstract

This invention relates to the field of waste heat recovery technology, and more particularly to a hot air circulation and recovery device for alumina production with waste gas purification function. The device includes a heat exchange tank; a purification heat exchange mechanism disposed inside the heat exchange tank, the purification heat exchange mechanism comprising: an insulation tank fixedly mounted on the heat exchange tank; a filter plate rotatably connected inside the heat exchange tank; and heat exchange tubes fixed to the outer wall of the heat exchange tank, with water supply pipes and water outlet pipes respectively connected to the heat exchange tubes, both of which are fixedly connected to the insulation tank. By setting up the heat exchange tubes, during hot air purification and recovery, the temperature of the heat exchange tank wall can be conducted to the heat exchange tubes and three heat exchange rings. When water flows inside the heat exchange tubes, it rapidly heats up and exchanges heat through contact with the three heat exchange rings. By setting up a reinforcing mechanism, the three heat exchange rings can reciprocate, ensuring that the water inside the heat exchange tubes is always in contact with the high-temperature positions of the heat exchange rings, thereby effectively improving the heat exchange effect.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and in particular to a hot air circulation and recovery device for alumina production with waste gas purification function. Background Technology

[0002] During the production of alumina, processes such as calcination generate a large amount of hot air containing impurities. These impurities can be mainly divided into particulate dust and gaseous pollutants. If these impurities are discharged directly without treatment, they will cause serious environmental pollution. In the process of treating impurities, the heat of the hot air can be recovered and reused through heat exchange, which can further reduce the energy consumption of the entire system.

[0003] When existing purification and recovery devices are in use, hot air is introduced into the treatment pipe for filtration. The heat of the hot air can only be exchanged between the outer wall of the treatment pipe and the water inside the pipe. The water inside the pipe that is close to the outer wall of the treatment pipe can exchange heat effectively, while the water that is far from the outer wall of the treatment pipe has a very poor heat exchange effect, resulting in low overall heat exchange efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings of low heat exchange efficiency in existing purification and recovery devices, the present invention provides a hot air circulation and recovery device for alumina production with waste gas purification function.

[0005] The technical solution of the present invention is: a hot air circulation and recovery device for alumina production with waste gas purification function, including a heat exchange tank;

[0006] A purification heat exchange mechanism is disposed inside the heat exchange tank, and the purification heat exchange mechanism includes:

[0007] A thermal insulation container, which is fixedly mounted on the heat exchange container;

[0008] A filter plate, which is rotatably connected inside the heat exchange tank;

[0009] A heat exchange tube is fixed to the outer wall of the heat exchange tank. A water supply pipe and a water outlet pipe are respectively connected to the heat exchange tube. Both the water supply pipe and the water outlet pipe are fixed to the heat insulation tank.

[0010] The reinforcing mechanism is located on the heat exchange tank and includes several heat exchange rings that are sealed and slide through the heat exchange tubes. All of the heat exchange rings are in contact with the outer wall of the heat exchange tank.

[0011] Furthermore, the reinforcing mechanism also includes a drive frame fixedly connected to a plurality of heat exchange rings, on which a first rack and a second rack are fixedly connected, and a toothed gear meshing with the first rack and the second rack is provided on the upper side of the heat exchange tube.

[0012] Furthermore, the enhancement mechanism also includes an impeller rotatably connected inside the heat exchange tube, the impeller shaft rotatably passing through the heat exchange tube and fixedly connected to the toothed gear, and a water guide plate fixedly connected inside the heat exchange tube.

[0013] Furthermore, the enhancement mechanism also includes several guide vanes fixed inside the heat exchange tube.

[0014] Furthermore, when the water in the heat exchange tube flows through the guide vanes, it can generate a rotating motion and form a secondary flow, thereby achieving mixing of the inner and outer layers of water.

[0015] Furthermore, it also includes a cleaning mechanism located inside the heat exchange tank. The cleaning mechanism includes a motor mounted on the heat insulation tank. The output shaft of the motor rotates through the heat insulation tank and is fixedly connected to a drive gear. The rotating shaft of the filter plate rotates through the heat exchange tank and is fixedly connected to a driven gear that meshes with the drive gear.

[0016] Furthermore, the cleaning mechanism also includes a hydraulic cylinder installed on the heat exchange tank. The telescopic end of the hydraulic cylinder slides through the heat exchange tank in a sealed manner and is fixedly connected to a lifting track. A stabilizing shaft is symmetrically fixed on the lifting track. The stabilizing shaft is slidably connected to the heat exchange tank in a through-seal manner. A spray pipe is slidably connected inside the lifting track.

[0017] Furthermore, the cleaning mechanism also includes a vertical rod fixed to the spray pipe, the vertical rod having a spiral groove and a circular plate movably fitted into the spiral groove, the circular plate being fixed to the heat exchange tank by a support plate.

[0018] Furthermore, L-shaped plates are symmetrically fixed to the lifting track, and vibrating rods are slidably connected through the L-shaped plates, the vibrating rods cooperating with the filter plates.

[0019] Furthermore, a mounting plate is fitted onto the vibrating rod, and a compression spring is provided between the mounting plate and the L-shaped plate. The compression spring is sleeved on the outer wall of the vibrating rod, and a wedge block is elastically slidably connected to the mounting plate. A protruding plate that cooperates with the wedge block is symmetrically fixed inside the heat exchange tank.

[0020] The beneficial effects of this invention are:

[0021] 1. By setting up heat exchange tubes, the temperature of the heat exchange tank wall can be conducted to the heat exchange tubes and three heat exchange rings during hot air purification and recovery. When water flows in the heat exchange tubes, it can quickly heat up and exchange heat by contacting the three heat exchange rings. By setting up a reinforcement mechanism, the three heat exchange rings can be rotated back and forth, and the water in the heat exchange tubes is always in contact with the high-temperature position of the heat exchange rings, thereby effectively improving the heat exchange effect.

[0022] 2. By setting guide vanes, when water flows through the heat exchange tube, the water flow generates a rotating motion and forms a secondary flow under the action of centrifugal force, thereby achieving the mixing of the inner and outer layers of water and preventing the water far from the inner wall of the heat exchange tube from having low heat exchange efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the purification heat exchange mechanism of the present invention;

[0025] Figure 3 This is a schematic diagram of the installation of the heat exchange ring of the present invention;

[0026] Figure 4 This is a schematic diagram of the installation at the first rack of the present invention;

[0027] Figure 5 This is a schematic diagram of the installation at the impeller of the present invention;

[0028] Figure 6 This is a schematic diagram of the installation of the guide plate of the present invention;

[0029] Figure 7 This is a schematic diagram of the cleaning mechanism of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the vertical rod of the present invention;

[0031] Figure 9 This is a schematic diagram of the installation of the wedge block in this invention.

[0032] In the attached diagram, the following labels are used: 1-Heat exchange tank, 201-Insulation tank, 202-Filter plate, 203-Heat exchange tube, 2031-Water supply pipe, 2032-Water outlet pipe, 204-Heat exchange ring, 301-Drive frame, 302-First rack, 303-Second rack, 304-Gear with missing tooth, 401-Impeller, 402-Water guide plate, 501-Guide vane, 601-Motor, 602-Driving gear, 603-Driven gear, 701-Hydraulic cylinder, 702-Lifting rail, 7021-Stabilizing shaft, 703-Spray pipe, 801-Vertical rod, 802-Circular plate, 901-L-shaped plate, 902-Vibrating rod, 1001-Mounting plate, 1002-Wedge block, 1003-Protruding plate. Detailed Implementation

[0033] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Example 1

[0035] A hot air recycling and recovery device for alumina production with waste gas purification function, such as Figures 1-4As shown, the device includes a heat exchange tank 1, which contains a purification heat exchange mechanism. The purification heat exchange mechanism includes an insulated tank 201 fixedly mounted on the heat exchange tank 1. A filter plate 202 is rotatably connected inside the heat exchange tank 1. A heat exchange tube 203 is fixedly connected to the middle of the outer wall of the heat exchange tank 1. A water supply pipe 2031 and a water outlet pipe 2032 are respectively connected to the heat exchange tube 203. Both the water supply pipe 2031 and the water outlet pipe 2032 are fixedly connected to the insulated tank 201. The heat exchange tank 1 is provided with a reinforcement mechanism to enhance the heat exchange effect. The reinforcement mechanism includes three heat exchange rings 204 that are sealed and slide through the heat exchange tube 203. The three heat exchange rings 204 are all in contact with the outer wall of the heat exchange tank 1. The insulated tank 201 can not only prevent the external air from lowering the temperature of the heat exchange tube 203 and the three heat exchange rings 204, but also prevent dust from falling on the three heat exchange rings 204.

[0036] like Figures 2-5 As shown, the reinforcing mechanism also includes a drive frame 301 fixed to the outer wall of the three heat exchange rings 204. A first rack 302 and a second rack 303 are fixed to the drive frame 301. A toothed gear 304 that meshes with the first rack 302 and the second rack 303 is provided on the upper side of the heat exchange tube 203. When the toothed gear 304 rotates, it can make the three heat exchange rings 204 slide back and forth in the heat exchange tube 203.

[0037] like Figure 5 As shown, the enhancement mechanism also includes an impeller 401 rotatably connected to the heat exchange tube 203 near the water supply pipe 2031. The shaft of the impeller 401 rotates through the heat exchange tube 203 and is fixedly connected to the toothed gear 304. A water guide plate 402 located on one side of the impeller 401 is fixedly connected inside the heat exchange tube 203. The water guide plate 402 is a flat baffle. The water in the heat exchange tube 203 is guided by the water guide plate 402, which enables the impeller 401 to rotate clockwise under the impact of the water.

[0038] like Figure 6 As shown, the enhancement mechanism also includes several guide vanes 501 fixed inside the heat exchange tube 203. The guide vanes 501 are spiral in shape. When the water in the heat exchange tube 203 flows through the guide vanes 501, it can cause the water to rotate and form a secondary flow, thereby achieving the mixing of the inner and outer layers of water and effectively improving the heat exchange effect.

[0039] During hot air recovery, hot air is introduced into heat exchange tank 1 through the top. The hot air flows downwards through filter plate 202, which filters impurities in the hot air to purify the exhaust gas. The purified exhaust gas is discharged through the bottom of heat exchange tank 1. The tank wall of heat exchange tank 1 heats up rapidly under the action of the hot air, and the heat is quickly transferred to heat exchange tube 203 and the three heat exchange rings 204. Simultaneously, water is introduced into heat exchange tube 203 through water pipe 2031, and the water flows to the water guide plate 402. At that time, under the action of the guide plate 402, the flow direction is changed, causing the water to impact the impeller 401. The impeller 401 drives the toothed gear 304 to rotate clockwise. The toothed gear 304 continuously and alternately meshes with the first rack 302 and the second rack 303. When the toothed gear 304 meshes with the first rack 302, the toothed gear 304 drives the three heat exchange rings 204 to rotate clockwise through the first rack 302 and the drive frame 301. When the toothed gear 304 meshes with the second rack 303, the toothed gear 304 drives the three heat exchange rings 204 to rotate clockwise through the first rack 302 and the drive frame 301. 03 and the drive frame 301 drive the three heat exchange rings 204 to rotate counterclockwise, thereby causing the three heat exchange rings 204 to reciprocate continuously. When water passes through the heat exchange rings 204, the water and the heat exchange rings 204 quickly exchange heat. The temperature of the heat exchange rings 204 at the point where water flows through them drops rapidly, while the part of the heat exchange rings 204 outside the heat exchange tube 203 remains at a high temperature. By causing the three heat exchange rings 204 to reciprocate, the water inside the heat exchange tube 203 can always be in contact with the high-temperature parts of the three heat exchange rings 204, thereby effectively improving the heat exchange effect. As the water passes through the guide vane 501, it rotates under the guidance of the guide vane 501. The centrifugal force generated by the rotation causes the water near the guide vane 501 to be squeezed towards the inner wall of the heat exchange tube 203. The water near the inner wall of the heat exchange tube 203 is squeezed and its flow velocity increases. Under the action of the pressure gradient, it flows towards the guide vane 501 to form a secondary circulation flow. After the water in the heat exchange tube 203 flows through all the guide vanes 501, the water in the inner and outer layers are finally mixed, which further improves the uniformity of heat exchange. The water that has completed heat exchange is discharged through the outlet pipe 2032.

[0040] Example 2

[0041] like Figure 7 As shown, an alumina production hot air circulation and recovery device with waste gas purification function also includes a cleaning mechanism for cleaning the filter plate 202 located in the heat exchange tank 1. The cleaning mechanism includes a motor 601 installed on the right side of the heat exchange tank 201. The output shaft of the motor 601 rotates through the heat exchange tank 201 and is fixedly connected to a drive gear 602. The rotating shaft of the filter plate 202 rotates through the heat exchange tank 1 and is fixedly connected to a driven gear 603 that meshes with the drive gear 602.

[0042] like Figure 7As shown, the cleaning mechanism also includes a hydraulic cylinder 701 installed on the heat exchange tank 1. The telescopic end of the hydraulic cylinder 701 slides through the heat exchange tank 1 and is fixedly connected to a lifting rail 702. A stabilizing shaft 7021 is symmetrically fixed on the lifting rail 702. The stabilizing shaft 7021 is slidably connected to the heat exchange tank 1. A spray pipe 703 is slidably connected inside the lifting rail 702. After the hot air purification and heat exchange work is completed, the output shaft of the control motor 601 is rotated to make the filter plate 202 rotate 180 degrees. Then, the piston end of the hydraulic cylinder 701 is extended to make the spray pipe 703 descend, which can effectively clean the filter plate 202.

[0043] like Figure 7 and Figure 8 As shown, the cleaning mechanism also includes a vertical rod 801 fixed to the spray pipe 703. The outer wall of the vertical rod 801 is provided with a spiral groove, and a circular plate 802 is movably fitted and slidably embedded in the spiral groove. The circular plate 802 is fixed to the heat exchange tank 1 by a support plate. When the spray pipe 703 descends, the spray pipe 703 can be rotated by the cooperation between the spiral groove of the vertical rod 801 and the circular plate 802.

[0044] like Figure 7 and Figure 9 As shown, an L-shaped plate 901 is symmetrically fixed to the bottom of the lifting track 702. A vibrating rod 902 is slidably connected through the L-shaped plate 901. The vibrating rod 902 cooperates with the filter plate 202. By the vibrating rod 902 striking the filter plate 202, the impurities on the filter plate 202 can be dislodged.

[0045] like Figure 9 As shown, a mounting plate 1001 is fitted on the lower part of the outer wall of the vibrating rod 902. A compression spring is provided between the mounting plate 1001 and the L-shaped plate 901. The compression spring is sleeved on the outer wall of the vibrating rod 902. A wedge block 1002 is elastically slidably connected to the mounting plate 1001 in the horizontal direction. The elastic force of the wedge block 1002 is greater than the elastic force of the compression spring. A protruding plate 1003 that cooperates with the wedge block 1002 is symmetrically fixed to the inner wall of the heat exchange tank 1.

[0046] Initially, the piston end of hydraulic cylinder 701 is in a retracted state. After completing the heat exchange and purification of the hot air, a large amount of impurities are trapped on the upper surface of filter plate 202. First, the output shaft of motor 601 is controlled to rotate clockwise. The output shaft of motor 601 drives the drive gear 602 to rotate. The drive gear 602 drives the filter plate 202 to rotate counterclockwise by 180 degrees through the driven gear 603. Then, the cleaning agent is introduced into the spray pipe 703. The spray pipe 703 sprays the cleaning agent onto the filter plate 202 to flush away the impurities. At the same time, the piston end of hydraulic cylinder 701 is controlled to extend. The piston end of hydraulic cylinder 701 drives the lifting rail 702 to descend. The lifting rail 702 drives the two stabilizing shafts 7021 to slide down and also drives the spray pipe 703 to descend. The spray pipe 703 drives the vertical rod 801 to descend. The circular plate 802, through its engagement with the spiral groove of the vertical rod 801, causes the vertical rod 801 to rotate, increasing the spraying area of ​​the spray pipe 703. Simultaneously, the lifting rail 702 drives two L-shaped plates 901 to descend, which in turn drives the vibrating rod 902 to descend. The vibrating rod 902, through the mounting plate 1001, drives the wedge block 1002 to descend. Subsequently, the lower inclined surface of the wedge block 1002 contacts the edge of the corresponding protruding plate 1003. Since the elastic force of the wedge block 1002 is greater than the elastic force of the compression spring, the protruding plate 1003, through the wedge block 1002 and the mounting plate 1001, limits the vibrating rod 902. At this time, the L-shaped plate 901 moves downward along the vibrating rod 902, and the compression spring contracts under force. When the piston end of the hydraulic cylinder 701 is fully extended, the spray pipe 703 rotates 180 degrees, and the spring force of the compression spring exceeds the spring force of the wedge block 1002. The compression spring releases, causing the vibrating rod 902 to descend. The vibrating rod 902, through the mounting plate 1001, causes the wedge block 1002 to descend. The wedge block 1002, under force, elastically contracts and slides, disengaging from the protruding plate 1003. The compression spring continues to release, causing the vibrating rod 902 to slide down rapidly and impact the filter plate 202, thus vibrating the filter plate 202. Impurities remaining on the filter plate 202 are completely removed and fall off under the action of vibration, achieving efficient cleaning of the filter plate 202. Then, the piston end of the hydraulic cylinder 701 is controlled to retract, and the piston end of the hydraulic cylinder 701 drives... The lifting rail 702 is raised, which drives the two stabilizing shafts 7021 to slide and rise, and also drives the spray pipe 703 to rise. The spray pipe 703 drives the vertical rod 801 to rise. The circular plate 802, through its engagement with the spiral groove of the vertical rod 801, causes the vertical rod 801 to drive the spray pipe 703 to reverse. At the same time, the lifting rail 702 drives the two L-shaped plates 901 to rise, and the L-shaped plates 901 drive the vibrating rod 902 to rise. The vibrating rod 902, through the mounting plate 1001, drives the wedge block 1002 to rise. Then, the upper inclined surface of the wedge block 1002 contacts the edge of the corresponding protruding plate 1003. The protruding plate 1003 squeezes the wedge block 1002, causing the wedge block 1002 to elastically contract and slide. Subsequently, the wedge block 1002 passes over the protruding plate 1003 and elastically releases and slides back to its original position.Until the piston end of the hydraulic cylinder 701 is fully retracted, the spray pipe 703 rises and reverses to reset, and the L-shaped plate 901 drives the vibrating rod 902 to reset. Since high temperatures remain inside the heat exchange tank 1, these residual temperatures can dry the moisture on the filter plate 202 before the next hot air purification and recovery, preventing impurities from mixing with water and forming slurry when passing through the filter plate 202.

[0047] After each repetition of the above steps to complete the purification and recovery of hot air, the output shaft of the control motor 601 rotates again, thereby causing the filter plate 202 to rotate 180 degrees, ensuring that the side of the filter plate 202 with a large amount of impurities is facing down each time the filter plate 202 is cleaned, so as to facilitate the cleaning of the filter plate 202.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hot air circulation and recovery device for alumina production with waste gas purification function, characterized in that: Including heat exchange tank (1); A purification heat exchange mechanism is disposed inside the heat exchange tank (1). The purification heat exchange mechanism includes: Insulated container (201), wherein the insulated container (201) is fixedly mounted on the heat exchange container (1); Filter plate (202), the filter plate (202) is rotatably connected inside the heat exchange tank (1); A heat exchange tube (203) is fixed to the outer wall of the heat exchange tank (1). A water supply pipe (2031) and a water outlet pipe (2032) are respectively connected to the heat exchange tube (203). Both the water supply pipe (2031) and the water outlet pipe (2032) are fixed to the heat insulation tank (201). The reinforcing mechanism is located on the heat exchange tank (1). The reinforcing mechanism includes several heat exchange rings (204) that are sealed and slide through the heat exchange tube (203). The several heat exchange rings (204) are all in contact with the outer wall of the heat exchange tank (1).

2. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 1, characterized in that: The enhancement mechanism also includes a drive frame (301) fixedly connected to a plurality of heat exchange rings (204), a first rack (302) and a second rack (303) fixedly connected to the drive frame (301), and a toothed gear (304) meshing with the first rack (302) and the second rack (303) is provided on the upper side of the heat exchange tube (203).

3. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 2, characterized in that: The enhancement mechanism also includes an impeller (401) rotatably connected inside the heat exchange tube (203). The axle of the impeller (401) rotatably passes through the heat exchange tube (203) and is fixedly connected to the toothed gear (304). A water guide plate (402) is fixedly connected inside the heat exchange tube (203).

4. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 3, characterized in that: The enhancement mechanism also includes several guide vanes (501) fixed inside the heat exchange tube (203). When the water in the heat exchange tube (203) flows through the guide vanes (501), it can generate a rotating motion and form a secondary flow, thereby achieving the mixing of the inner and outer layers of water.

5. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 1, characterized in that: It also includes a cleaning mechanism located inside the heat exchange tank (1). The cleaning mechanism includes a motor (601) installed on the heat preservation tank (201). The output shaft of the motor (601) rotates through the heat preservation tank (201) and is fixedly connected to a drive gear (602). The rotating shaft of the filter plate (202) rotates through the heat exchange tank (1) and is fixedly connected to a driven gear (603) that meshes with the drive gear (602).

6. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 5, characterized in that: The cleaning mechanism also includes a hydraulic cylinder (701) installed on the heat exchange tank (1). The telescopic end of the hydraulic cylinder (701) slides through the heat exchange tank (1) and is fixedly connected to a lifting rail (702). A stabilizing shaft (7021) is symmetrically fixed on the lifting rail (702). The stabilizing shaft (7021) is slidably connected to the heat exchange tank (1) through a through-type sealed connection. A spray pipe (703) is slidably connected inside the lifting rail (702).

7. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 6, characterized in that: The cleaning mechanism also includes a vertical rod (801) fixed to the spray pipe (703). The vertical rod (801) has a spiral groove and a circular plate (802) embedded in the spiral groove is movably fitted. The circular plate (802) is fixed to the heat exchange tank (1) by a support plate.

8. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 6, characterized in that: An L-shaped plate (901) is symmetrically fixed on the lifting track (702), and a vibrating rod (902) is slidably connected through the L-shaped plate (901). The vibrating rod (902) cooperates with the filter plate (202).

9. The alumina production hot air circulation and recovery device with waste gas purification function according to claim 8, characterized in that: The vibrating rod (902) is fitted with an installation plate (1001), and a compression spring is provided between the installation plate (1001) and the L-shaped plate (901). The compression spring is sleeved on the outer wall of the vibrating rod (902). A wedge (1002) is elastically slidably connected to the installation plate (1001). A protruding plate (1003) that cooperates with the wedge (1002) is symmetrically fixed inside the heat exchange tank (1).

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