Lithium iron phosphate material production waste gas treatment device and method

Abstract

The application discloses a lithium iron phosphate material production waste gas treatment device and method, and relates to the technical field of waste gas treatment. The device comprises a TO incinerator, a quenching tower arranged on the left side of the TO incinerator, a wet electric precipitator arranged on the left side of the quenching tower, a SDS dry desulfurization device arranged on the left side of the wet electric precipitator, and a bag-type dust collector arranged on the left side of the SDS dry desulfurization device. The TO incinerator, the quenching tower, the wet electric precipitator, the SDS dry desulfurization device and the bag-type dust collector are connected through pipelines. A powder spraying device is fixedly arranged in the SDS dry desulfurization device. A feeding device is arranged on the surface of the powder spraying device. A rotary nozzle is rotatably arranged at the bottom of the powder spraying device. A smoke inlet is fixedly arranged on the inner wall of the SDS dry desulfurization device. The rotary nozzle is rotated to improve the spraying range, so that the smoke gas is prevented from being in the dead angle of the equipment, the baking soda cannot be covered, and the removal effect is affected.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment, specifically relating to a waste gas treatment device and method for lithium iron phosphate material production. Background Technology

[0002] Lithium iron phosphate cathode materials will produce substances containing [unclear] during the high-temperature solid-state sintering process. Complex flue gas containing tar, dust, and VOCs, although existing wet desulfurization technologies can remove them... However, it generates a large amount of saline wastewater, and the system is prone to scaling and corrosion, resulting in high operation and maintenance costs.

[0003] Patent publication number CN212942156U relates to a waste gas treatment device for chemical processing, belonging to the field of waste gas treatment. This waste gas treatment device for chemical processing includes an inlet pipe, the outer curved surface of which is fixedly sleeved on the upper surface of a purification tank. An L-shaped pipe is fixedly connected to one side of the upper surface of the purification tank. An L-shaped pipe A is fixedly connected to the outer curved surface of the L-shaped pipe away from the purification tank. The end of L-shaped pipe A away from the L-shaped pipe is fixedly connected to the upper surface of a filter cylinder. A fixing plate is fixedly sleeved on the outer curved surface of the filter cylinder. This waste gas treatment device for chemical processing uses a purification liquid inside the purification tank to perform initial treatment of the waste gas, facilitating the removal of harmful gases and dust. The gas discharged from the purification tank is then passed into the filter cylinder, where multiple layers of activated carbon inside the filter cylinder further treat the waste gas, improving the treatment effect and solving the problems of poor and incomplete treatment of chemical waste gas in existing devices.

[0004] In existing technologies, it is convenient to treat harmful gases and dust in waste gas by passing the gas discharged from the purification tank into the filter cartridge, where the multi-layer activated plates inside the filter cartridge further treat the waste gas, thereby improving the waste gas treatment effect. This solves the problem of poor and incomplete treatment of chemical waste gas in existing devices. However, the continuous introduction of a large amount of waste gas will cause the equipment to be unable to treat all the waste gas in time, resulting in some waste gas being discharged directly without treatment, which affects the waste gas treatment effect. At the same time, when spraying dry powder, the dry powder may condense inside the equipment, causing nozzle blockage and affecting the spraying effect. Summary of the Invention

[0005] The purpose of this invention is to solve at least one of the problems in the prior art mentioned above, and to provide a device and method for treating waste gas from lithium iron phosphate material production.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A waste gas treatment device for lithium iron phosphate material production includes: a TO incinerator; a quench tower is arranged on the left side of the TO incinerator; a wet electrostatic precipitator is arranged on the left side of the quench tower; an SDS dry desulfurization unit is arranged on the left side of the wet electrostatic precipitator; and a bag filter is arranged on the left side of the SDS dry desulfurization unit. The TO incinerator, quench tower, wet electrostatic precipitator, SDS dry desulfurization unit, and bag filter are all connected by pipelines. A powder spraying device is fixedly installed inside the SDS dry desulfurization unit. A feeding device is arranged on the surface of the powder spraying device, and a rotary sprayer is rotatably installed at the bottom of the powder spraying device. The SDS dry desulfurization device has a flue gas inlet fixedly installed on its inner wall. A flue gas inlet barrel is fixedly installed on the top of the flue gas inlet. A flue gas inlet hole is opened on the surface of the flue gas inlet. An electric telescopic rod is fixedly installed inside the flue gas inlet. A cross is fixedly installed at the output end of the electric telescopic rod. A sealing cover is fixedly installed on the surface of the cross. A spiral rod is fixedly installed on the top of the cross. A spiral seat is fixedly installed at the bottom of the rotating nozzle. The spiral seat is threadedly connected to the spiral rod. When the cross moves upward, it will drive the spiral rod to move upward. The upward movement of the spiral rod will push the spiral seat to rotate. The rotation of the spiral seat will drive the rotating nozzle to rotate.

[0007] Furthermore, the sealing cover contacts the surface of the smoke inlet barrel, thereby sealing the smoke inlet barrel. The screw rod is used to drive the screw seat to rotate.

[0008] Furthermore, the SDS dry desulfurization device is equipped with an anti-clogging device and a mixing device to prevent dry powder from clogging. The anti-clogging device includes a sliding ring, a discharge port, a rotating ring, and a fixed plate. The sliding ring is slidably installed on the inner wall of the powder spraying device. The surface of the sliding ring has a discharge port, the size of which decreases from left to right. The rotating ring is fixedly installed on the top of the rotating nozzle, and the fixed plate is fixedly installed on the surface of the rotating ring. The rotation of the rotating nozzle will drive the rotating ring to rotate, and the rotation of the rotating ring will drive the fixed plate to rotate. The rotation of the fixed plate will push the baking soda inside the powder spraying device to be evenly distributed.

[0009] Furthermore, an arc-shaped plate is fixedly installed on the surface of the rotating ring, and an L-shaped rod is fixedly installed on the top of the sliding ring. The arc-shaped plate will push the L-shaped rod to move upward, and the upward movement of the L-shaped rod will drive the sliding ring to move upward. The upward movement of the sliding ring will disperse the baking soda powder inside the powder spraying device.

[0010] Furthermore, a first spring is provided between the sliding ring and the powder spraying device. The sliding ring is reset by the elastic force of the first spring itself, and the arc plate is used to push the L-shaped rod upward.

[0011] Furthermore, the mixing device includes a rotating shaft, a circular plate, and a rotating plate. The rotating shaft is rotatably mounted on the circumferential surface of the screw rod, the circular plate is fixedly mounted on the circumferential surface of the rotating shaft, and the rotating plate is fixedly mounted on the circumferential surface of the circular plate. The rotating shaft moves up and down by moving an electric telescopic rod, which in turn moves the circular plate up and down, which in turn moves the rotating plate up and down.

[0012] Furthermore, a hollow column is fixedly installed on the surface of the circular plate, and a sliding rod is fixedly installed at the bottom of the rotating nozzle. The sliding rod slides through the surface of the hollow column, and the rotation of the hollow column will drive the circular plate to rotate, which in turn will drive the rotating plate to rotate.

[0013] Furthermore, the circular plate is used to agitate the internal airflow, and the internal flue gas is agitated by moving the circular plate up and down. The rotating plate is used to disrupt the flue gas inside the SDS dry desulfurization unit.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes the reciprocating motion of the cross joint to drive the sealing cover to move up and down. The upward movement of the sealing cover gradually seals the smoke inlet. By changing the opening of the smoke inlet, the localized flue gas flow rate and distribution entering the SDS device are adjusted. Simultaneously, the upward movement of the cross joint drives the spiral rod upward, which in turn rotates the spiral seat. This rotation of the spiral seat, in turn, drives the rotating nozzle, increasing the spray range and preventing smoke from accumulating in dead zones where baking soda cannot be effectively covered, thus affecting the removal of harmful gases. Effect.

[0015] 2. In this invention, as the rotary nozzle rotates, it gradually aligns with the discharge port, causing the opening to narrow. As the amount of flue gas entering decreases, the amount of baking soda sprayed also decreases synchronously, thus achieving a dynamic match between the spray volume and the flue gas volume, preventing resource waste. Simultaneously, the rotation of the rotary nozzle drives the rotating ring, which in turn drives the fixed plate. This rotation of the fixed plate promotes a more even distribution of baking soda inside the powder spraying device, preventing baking soda accumulation at the pipe opening and causing uneven spraying, which would affect the removal of harmful substances. Effect.

[0016] 3. In this invention, the rotating ring drives the arc plate to rotate. During the rotation of the arc plate, it will come into contact with the L-shaped rod. When the arc plate rotates, the arc surface will come into contact with the L-shaped rod, and the arc plate will push the L-shaped rod to move upward. The upward movement of the L-shaped rod will drive the sliding ring to move upward. The upward movement of the sliding ring will shake the baking soda powder inside the powder spraying device to ensure that the baking soda is loose and avoid the baking soda clumping, which would block the rotating nozzle and affect the baking soda spraying effect.

[0017] 4. This invention utilizes the up-and-down movement of a circular plate to drive the up-and-down movement of a rotating plate. This movement of the circular plate and rotating plate agitates the airflow, ensuring the dry powder is evenly distributed across the entire cross-section, preventing localized desulfurization inefficiencies. Simultaneously, the rotating nozzle on the circular plate rotates, causing a sliding rod to rotate. This rotation, in turn, rotates the hollow column, which in turn rotates the circular plate, which in turn rotates the rotating plate. The simultaneous up-and-down movement and rotation of the rotating plate further generates a swirling effect, causing the dry powder to mix with the flue gas... More thorough contact and a more complete reaction improve the overall desulfurization effect and prevent flue gas from accumulating in dead corners, where dry powder tends to accumulate locally. Insufficient contact with the desulfurizing agent affects the desulfurization effect. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the SDS dry desulfurization unit in this invention; Figure 3 This is a schematic cross-sectional view of the smoke inlet in this invention; Figure 4 This is a cross-sectional schematic diagram of the powder spraying device in this invention; Figure 5 This is a schematic diagram of the sliding ring and L-shaped rod in this invention; Figure 6 This is a schematic diagram of the rotating nozzle and rotating ring in this invention; Figure 7 This is a schematic diagram of the hollow column and sliding rod in this invention.

[0019] Figure label: 1. TO incinerator; 2. Quenching tower; 3. Wet electrostatic precipitator; 4. SDS dry desulfurization unit; 5. Bag filter; 6. Powder spraying device; 61. Feeding device; 7. Rotary nozzle; 8. Flue gas inlet; 9. Flue gas inlet cassette; 10. Electric telescopic rod; 11. Cross; 12. Sealing cover; 13. Screw rod; 14. Screw seat; 151. Sliding ring; 152. Discharge port; 153. Rotating ring; 154. Fixed plate; 155. Arc plate; 156. L-shaped rod; 161. Rotating shaft; 162. Circular plate; 163. Rotating plate; 164. Hollow column; 165. Sliding rod. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] like Figures 1 to 5 As shown in this embodiment, a waste gas treatment device for lithium iron phosphate material production includes: a TO incinerator 1, a quench tower 2 arranged on the left side of the TO incinerator 1, a wet electrostatic precipitator 3 arranged on the left side of the quench tower 2, an SDS dry desulfurization device 4 arranged on the left side of the wet electrostatic precipitator 3, and a bag filter 5 arranged on the left side of the SDS dry desulfurization device 4. The TO incinerator 1, quench tower 2, wet electrostatic precipitator 3, SDS dry desulfurization device 4, and bag filter 5 are all connected by pipelines. A powder spraying device 6 is fixedly installed inside the SDS dry desulfurization device 4. A feeding device 61 is arranged on the surface of the powder spraying device 6. A rotating nozzle 7 is rotatably installed at the bottom of the powder spraying device 6. A flue gas inlet 8 is fixedly installed on the inner wall of the SDS dry desulfurization device 4. A smoke inlet hopper 9 is fixedly installed at the top of the smoke inlet 8. Smoke inlet holes are provided on the surface of the smoke inlet hopper 9. An electric telescopic rod 10 is fixedly installed inside the smoke inlet 8. A cross 11 is fixedly installed at the output end of the electric telescopic rod 10. A sealing cover 12 is fixedly installed on the surface of the cross 11. A spiral rod 13 is fixedly installed at the top of the cross 11. A spiral seat 14 is fixedly installed at the bottom of the rotating nozzle 7. The spiral seat 14 is threadedly connected to the spiral rod 13. When the cross 11 moves upward, it drives the spiral rod 13 to move upward. The upward movement of the spiral rod 13 pushes the spiral seat 14 to rotate. The rotation of the spiral seat 14 drives the rotating nozzle 7 to rotate. By rotating the nozzle 7, the spray range is increased, preventing smoke from getting trapped in dead corners of the equipment, which would prevent the baking soda from being properly covered and affecting the removal of smoke. Effect.

[0022] The sealing cover 12 contacts the surface of the smoke inlet 9 and seals the smoke inlet 9. The screw rod 13 is used to drive the screw seat 14 to rotate.

[0023] In this embodiment, the following steps are taken: First, the tar and VOCs are decomposed at high temperature in the TO incinerator 1. The flue gas is heated to above 750°C, causing the organic matter to be oxidized and decomposed. and The process involves eliminating sticky blockages, then rapidly cooling the flue gas in a quench tower 2 to prevent secondary condensation. Water atomization reduces the flue gas temperature from high to approximately 200°C within one second, allowing tar vapors to bypass the condensation zone. A wet electrostatic precipitator 3 then captures tar droplets and fine dust particles in its electric field. The high-voltage electric field charges the particles, which are then captured by the collecting electrodes. A continuous water film washes over the particles to prevent adhesion. Finally, the flue gas enters the SDS dry desulfurization unit 4, where baking soda powder is sprayed to remove tar. Baking soda pyrolyzes into highly active porous sodium carbonate, and... The gas-solid reaction generates dry powder byproducts, which are then filtered by a bag filter 5 to trap particulate matter. The flue gas is filtered by a membrane filter bag to trap dust and desulfurization byproducts, and clean gas is discharged. When the powder spraying device 6 sprays baking soda, the electric telescopic rod 10 is activated. The reciprocating motion of the output end of the electric telescopic rod 10 drives the cross 11 to reciprocate up and down. The reciprocating motion of the cross 11 drives the sealing cover 12 to reciprocate up and down. The upward movement of the sealing cover 12 slowly seals the smoke inlet. By changing the opening of the smoke inlet, the local flue gas velocity and distribution entering the SDS device are adjusted. At the same time, when the cross 11 moves upward, it drives the screw rod 13 to move upward. The upward movement of the screw rod 13 pushes the screw seat 14 to rotate. The rotation of the screw seat 14 drives the rotating nozzle 7 to rotate. The rotation of the rotating nozzle 7 increases the spray range and prevents the flue gas from getting stuck in the equipment's dead corners, which would prevent the baking soda from being covered and affect the removal of the smoke. Effect.

[0024] A method for using a waste gas treatment device for lithium iron phosphate material production includes the following steps: Step 1: First, the flue gas is heated to over 750°C in the TO incinerator 1 to decompose tar and VOCs at high temperatures, causing the organic matter to oxidize and decompose. and Eliminate sticky blockages, then rapidly cool down the flue gas through the quench tower 2 to prevent secondary condensation, and spray water atomization to reduce the temperature of the flue gas from high temperature to about 200°C within one second, allowing the tar vapor to skip the condensation zone. Step 2: The tar droplets and fine dust are then captured by the wet electrostatic precipitator 3. The high-voltage electric field charges the particles, which are then captured by the collecting electrodes. A water film continuously washes over the particles to prevent adhesion. The flue gas then enters the SDS dry desulfurization unit 4, where baking soda powder is sprayed to remove tar. Baking soda pyrolyzes into highly active porous sodium carbonate, and... The gas-solid reaction generates dry powder byproducts, which are then filtered by a bag filter 5 to trap particulate matter. The flue gas is filtered by a membrane filter bag to trap dust and desulfurization byproducts, and clean gas is discharged. Step 3: When the powder spraying device 6 sprays baking soda, the electric telescopic rod 10 is started. The up-and-down reciprocating motion of the output end of the electric telescopic rod 10 will drive the cross 11 to move up and down. The up-and-down reciprocating motion of the cross 11 will drive the sealing cover 12 to move up and down. The sealing cover 12 moves upward and slowly seals the smoke inlet. By changing the opening of the smoke inlet, the local flue gas flow rate and distribution entering the SDS device can be adjusted. Step 4: Simultaneously, as the cross 11 moves upward, it drives the screw rod 13 upward. The upward movement of the screw rod 13 pushes the screw seat 14 to rotate. The rotation of the screw seat 14 drives the rotating nozzle 7 to rotate. By rotating the rotating nozzle 7, the spray range is increased, preventing fumes from remaining in the dead corners of the equipment, which would prevent the baking soda from being sprayed and thus affecting the removal of fumes. Effect. Example

[0025] like Figures 1 to 7As shown, this embodiment of the lithium iron phosphate material production waste gas treatment device and method includes all the technical features of Embodiment 1. In addition, the SDS dry desulfurization device 4 is internally equipped with an anti-clogging device and a mixing device to prevent dry powder clogging. The anti-clogging device includes a sliding ring 151, a discharge port 152, a rotating ring 153, and a fixing plate 154. The sliding ring 151 is slidably installed on the inner wall of the powder spraying device 6. The surface of the sliding ring 151 has a discharge port 152, the size of which decreases from left to right. The rotating ring 153 is fixedly installed on the top of the rotating nozzle 7, and the fixing plate 154 is fixedly installed on the surface of the rotating ring 153. The rotation of the rotating nozzle 7 drives the rotating ring 153 to rotate, which in turn drives the fixing plate 154 to rotate. The rotation of the fixing plate 154 promotes the uniform distribution of baking soda inside the powder spraying device 6, preventing baking soda from accumulating at the pipe opening and causing uneven spraying distribution, thus affecting desulfurization. Effect.

[0026] An arc-shaped plate 155 is fixedly installed on the surface of the rotating ring 153, and an L-shaped rod 156 is fixedly installed on the top of the sliding ring 151. The arc-shaped plate 155 will push the L-shaped rod 156 to move upward. The upward movement of the L-shaped rod 156 will drive the sliding ring 151 to move upward. The upward movement of the sliding ring 151 will shake the baking soda powder inside the powder spraying device 6 to ensure that the baking soda is loose and to prevent the baking soda from clumping and causing the rotating nozzle 7 to be blocked, thus affecting the baking soda spraying effect.

[0027] A first spring is provided between the sliding ring 151 and the powder spraying device 6. The sliding ring 151 is reset by the elastic force of the first spring itself, and the arc plate 155 is used to push the L-shaped rod 156 to move upward.

[0028] In this embodiment, as the rotary nozzle 7 rotates, it gradually aligns with the discharge port 152, causing the opening to narrow. As the amount of flue gas entering decreases, the amount of baking soda sprayed also decreases accordingly, achieving a dynamic match between the spray volume and the flue gas volume, preventing resource waste. Simultaneously, the rotation of the rotary nozzle 7 drives the rotating ring 153 to rotate, which in turn drives the fixed plate 154 to rotate. The rotation of the fixed plate 154 promotes a uniform distribution of baking soda inside the powder spraying device 6, preventing baking soda accumulation at the pipe opening and causing uneven spraying, which would affect removal. The effect is that the rotation of the rotating ring 153 will drive the arc plate 155 to rotate. During the rotation of the arc plate 155, it will come into contact with the L-shaped rod 156. When the arc plate 155 rotates, the arc surface will come into contact with the L-shaped rod 156. The arc plate 155 will push the L-shaped rod 156 to move upward. The upward movement of the L-shaped rod 156 will drive the sliding ring 151 to move upward. The upward movement of the sliding ring 151 will shake the baking soda powder inside the powder spraying device 6 to ensure that the baking soda is loose and avoid the baking soda clumping, which will cause the rotating nozzle 7 to be blocked and affect the baking soda spraying effect.

[0029] The mixing device includes a rotating shaft 161, a circular plate 162, and a rotating plate 163. The rotating shaft 161 is rotatably mounted on the circumferential surface of the screw rod 13. The circular plate 162 is fixedly mounted on the circumferential surface of the rotating shaft 161, and the rotating plate 163 is fixedly mounted on the circumferential surface of the circular plate 162. The rotating shaft 161 moves up and down by moving the electric telescopic rod 10. The up and down movement of the rotating shaft 161 causes the circular plate 162 to move up and down, and the up and down movement of the circular plate 162 causes the rotating plate 163 to move up and down. The up and down movement of the circular plate 162 and the rotating plate 163 agitates the airflow, allowing the dry powder to be evenly diffused throughout the entire cross section, thus avoiding localized low desulfurization efficiency.

[0030] A hollow column 164 is fixedly installed on the surface of the circular plate 162. A sliding rod 165 is fixedly installed at the bottom of the rotating nozzle 7. The sliding rod 165 slides through the surface of the hollow column 164. The rotation of the hollow column 164 will drive the circular plate 162 to rotate, which in turn will drive the rotating plate 163 to rotate. The rotation of the rotating plate 163, while moving up and down, further generates a swirling effect, causing the dry powder to mix with the flue gas. More thorough contact and a more complete reaction improve the overall desulfurization effect and prevent flue gas from accumulating in dead corners, where dry powder tends to accumulate locally. Insufficient contact with the desulfurizing agent affects the desulfurization effect.

[0031] The circular plate 162 is used to agitate the internal airflow. The circular plate 162 moves up and down to agitate the flue gas inside the SDS dry desulfurization unit 4. The rotating plate 163 is used to disturb the flue gas inside the SDS dry desulfurization unit 4.

[0032] The electric telescopic rod 10 moves up and down, driving the rotating shaft 161 to move up and down. The rotating shaft 161 then moves the circular plate 162 up and down, which in turn drives the rotating plate 163 to move up and down. This up-and-down movement of the circular plate 162 and rotating plate 163 agitates the airflow, ensuring the dry powder is evenly distributed across the entire cross-section and preventing localized desulfurization inefficiencies. Simultaneously, the rotating nozzle 7, as the circular plate 162 moves up and down, drives the sliding rod 165 to rotate. This rotation of the sliding rod 165, in turn, drives the hollow column 164 to rotate. The rotation of the hollow column 164, in turn, drives the circular plate 162 to rotate, which in turn drives the rotating plate 163 to rotate. The simultaneous up-and-down movement and rotation of the rotating plate 163 further generates a swirling effect, causing the dry powder to mix with the flue gas... More thorough contact and a more complete reaction improve the overall desulfurization effect and prevent flue gas from accumulating in dead corners, where dry powder tends to accumulate locally. Insufficient contact with the desulfurizing agent affects the desulfurization effect.

[0033] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0034] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

Claims

1. A lithium iron phosphate material production off-gas treatment apparatus comprising: A TO incinerator (1) is provided with a quench tower (2) on its left side, a wet electrostatic precipitator (3) on its left side, an SDS dry desulfurization device (4) on its left side, and a bag filter (5) on its left side. The TO incinerator (1), quench tower (2), wet electrostatic precipitator (3), SDS dry desulfurization device (4), and bag filter (5) are all connected by pipelines. The SDS dry desulfurization device (4) is equipped with a powder spraying device (6) inside. The powder spraying device (6) is provided with a feeding device (61) on its surface. A rotating nozzle (7) is rotatably installed at the bottom of the powder spraying device (6). An inlet (8) is fixedly installed on the inner wall of the SDS dry desulfurization device (4). An inlet barrel (9) is fixedly installed on the top of the inlet (8). An inlet hole is opened on the surface of the inlet barrel (9). An electric telescopic rod (10) is fixedly installed inside the inlet (8). A cross (11) is fixedly installed at the output end of the electric telescopic rod (10). A sealing cover (12) is fixedly installed on the surface of the cross (11). A screw rod (13) is fixedly installed on the top of the cross (11). A screw seat (14) is fixedly installed at the bottom of the rotating nozzle (7). The screw seat (14) is threadedly connected to the screw rod (13).

2. The lithium iron phosphate material production off-gas treatment device according to claim 1, characterized in that, The sealing cover (12) is in contact with the surface of the flue gas inlet (9), the screw rod (13) is used to drive the screw seat (14) to rotate, and the SDS dry desulfurization device (4) is equipped with an anti-clogging device and a mixing device to prevent dry powder from clogging.

3. The lithium iron phosphate material production off-gas treatment device according to claim 2, characterized in that, The anti-clogging device includes a sliding ring (151), a discharge port (152), a rotating ring (153), and a fixing plate (154). The sliding ring (151) is slidably installed on the inner wall of the powder spraying device (6). The surface of the sliding ring (151) is provided with a discharge port (152). The size of the discharge port (152) decreases from left to right. The rotating ring (153) is fixedly installed on the top of the rotating nozzle (7). The fixing plate (154) is fixedly installed on the surface of the rotating ring (153).

4. The lithium iron phosphate material production off-gas treatment device according to claim 3, characterized in that, An arc-shaped plate (155) is fixedly installed on the surface of the rotating ring (153), and an L-shaped rod (156) is fixedly installed on the top of the sliding ring (151).

5. The lithium iron phosphate material production off-gas treatment device according to claim 4, characterized in that, A spring is provided between the sliding ring (151) and the powder spraying device (6), and the arc plate (155) is used to push the L-shaped rod (156) upward.

6. The lithium iron phosphate material production off-gas treatment device according to claim 5, characterized in that, The mixing device includes a rotating shaft (161), a circular plate (162), and a rotating plate (163). The rotating shaft (161) is rotatably mounted on the circumferential surface of the screw rod (13), the circular plate (162) is fixedly mounted on the circumferential surface of the rotating shaft (161), and the rotating plate (163) is fixedly mounted on the circumferential surface of the circular plate (162).

7. The lithium iron phosphate material production off-gas treatment device according to claim 6, characterized by, The hollow column (164) is fixedly installed on the surface of the circular plate (162), the sliding rod (165) is fixedly installed on the bottom of the rotating nozzle (7), and the sliding rod (165) slides through the surface of the hollow column (164).

8. The lithium iron phosphate material production off-gas treatment device according to claim 7, characterized in that, The circular plate (162) is used for stirring the internal airflow, and the rotating plate (163) is used for stirring the internal flue gas of the SDS dry desulfurization device (4).

9. A method of using a lithium iron phosphate material production off-gas treatment device, the method comprising using a lithium iron phosphate material production off-gas treatment device according to claim 8, wherein, The method comprises the following steps: Step one: first, through the TO incinerator (1) high temperature decomposition of tar and VOCs, the flue gas is heated to 750 ℃ or more, so that the organic matter is oxidized and decomposed into and , eliminate sticky blockage, and then through the quenching tower (2) rapid cooling to prevent secondary condensation, spray atomization, and let the tar vapor jump over the condensation interval in one second from high temperature to about 200 ℃. Step 2: Then, the tar droplets and fine dust are captured by the electric field of the wet electrostatic precipitator (3). The high-voltage electric field charges the particles and they are captured by the dust collecting electrode. The water film continuously washes to prevent adhesion. After the flue gas enters the SDS dry desulfurization unit (4), baking soda powder is sprayed to remove the tar droplets and fine dust. Baking soda pyrolyzes into highly active porous sodium carbonate, and... The gas-solid reaction generates dry powder byproducts, which are then intercepted by a bag filter (5). The flue gas is filtered by a membrane filter bag to intercept dust and desulfurization byproducts, and the clean gas is discharged. Step three: when the powder spraying device (6) sprays baking soda, the electric telescopic rod (10) is started, the up-down reciprocating movement of the output end of the electric telescopic rod (10) drives the up-down reciprocating movement of the cross (11), the up-down reciprocating movement of the cross (11) drives the up-down reciprocating movement of the sealing cover (12), and the upward movement of the sealing cover (12) slowly seals the smoke inlet, and the smoke flow rate and distribution in the local SDS device are adjusted by changing the opening degree of the smoke inlet. Step 4: Simultaneously, when the cross (11) moves upward, it will drive the screw rod (13) to move upward. The upward movement of the screw rod (13) will push the screw seat (14) to rotate. The rotation of the screw seat (14) will drive the rotating nozzle (7) to rotate. By rotating the rotating nozzle (7), the spray range is increased, preventing the flue gas from remaining in the dead corners of the equipment, which would prevent the baking soda from being covered during spraying and affect the removal of the flue gas. Effect.

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