Desulfurization wastewater spray drying tower based on gradient utilization of waste heat of flue gas

Abstract

The invention discloses a desulfurization wastewater spray drying tower based on gradient utilization of waste heat of flue gas, and belongs to the technical field of wastewater treatment. According to the flue gas waste heat gradient utilization system, the driving assembly and the gradient heat supply assembly are arranged in a matched mode, through the design, a flue gas waste heat gradient utilization mode is adopted, waste heat recycling can be achieved, waste heat gradient utilization can also be achieved, and waste heat in different temperature intervals can be recycled according to the principle of high energy and high utilization and low energy and low utilization. The waste heat is recycled step by step and used for different processes, so that the overall energy utilization rate is increased, waste of high-grade heat energy is avoided, meanwhile, heat can be rapidly concentrated, initial atomized liquid is rapidly dried, it is avoided that initially atomized waste water is not rapidly dried and is attached to the inner wall of the upper section of the tower body, and impurity deposition is avoided; and the normal use of equipment is continuously ensured.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat. Background Technology

[0002] Wastewater treatment refers to the process of removing pollutants (such as organic matter, heavy metals, pathogens, etc.) from wastewater through physical, chemical, biological, or combined processes to meet discharge standards or reuse requirements. In the treatment of desulfurization wastewater, in order to improve the treatment effect, an atomizing drying tower is used to atomize the wastewater and dry it rapidly, causing a large amount of wastewater to evaporate and ultimately generate a large number of particulate impurities, thus achieving efficient and high-yield treatment of wastewater.

[0003] Chinese patent (CN110668625A) discloses a high-efficiency and energy-saving desulfurization wastewater treatment process system. This system includes a pre-sedimentation tank, a sludge scraper, an induced draft fan, an evaporation tower, a wastewater circulation pump, a slurry tank, a thick slurry pump, a spray drying tower, a mixer, and a sludge pump. Incoming water is collected in the pre-sedimentation tank via pipelines. When the sludge scraper reaches a set torque, sludge is pumped into a gypsum dewatering system for dewatering. The motor and fan are started, and wastewater from the upper part of the pre-sedimentation tank passes through the evaporation tower. The wastewater evaporates in the evaporation tower, and after reaching a certain concentration, it is discharged into the slurry tank and then into the spray drying tower. High-temperature flue gas from the air preheater inlet is introduced into the spray drying tower, causing salts in the slurry to precipitate. This process not only reduces sludge production but also enables waste utilization. Furthermore, it has low investment and operating costs, is easy to operate, and has broad industrial application prospects. While current treatment equipment and processes can treat wastewater, after the wastewater is atomized and sprayed, the high-temperature gas requires a certain amount of time to dry the atomized liquid. Some atomized wastewater droplets adhere to the inner wall of the upper section of the drying tower during the spraying process. After drying at high temperatures, impurities remain on the inner surface of the upper part of the drying tower. Over time, the accumulation of impurities increases, affecting the normal operation of the equipment. Furthermore, the lack of effective cascaded energy supply results in energy waste and poor practical application. To solve these problems, there is an urgent need for a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat. Summary of the Invention

[0004] The purpose of this invention is to address the problem that while current treatment equipment and processes can treat wastewater, the high-temperature gas requires time to dry the atomized liquid after spraying. As a result, some atomized wastewater droplets adhere to the inner wall of the upper section of the drying tower during spraying, leaving residues on the upper inner surface after drying. Over time, this accumulation of impurities affects the normal operation of the equipment. Furthermore, the lack of effective cascaded energy supply leads to energy waste and poor practical application. Therefore, this invention proposes a desulfurization wastewater spray drying tower based on the cascaded utilization of flue gas waste heat.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat, comprising a tower frame, a tower body arranged on the inner side of the tower frame, a top cover arranged on the top of the tower body, a water storage tank arranged on the top surface of the top cover, a water inlet pipe arranged on one side of the outer wall of the water storage tank, an atomizer arranged at the bottom of the top cover, an exhaust gas duct arranged on one side of the outer wall of the tower body, one end of the exhaust gas duct connected to an exhaust gas processor, an exhaust pipe arranged on the other side of the outer wall of the tower body, and an inspection door installed on the outer side of the tower body via a hinge.

[0006] The tower includes a drive assembly and a gradient heating assembly. The gradient heating assembly is mounted on the top cover and is used to supply waste heat from different flue gas stages. The inner surface of the tower body is provided with an airflow spiral groove and a movable groove. A movable filter plate is movably installed in the movable groove. The drive assembly is used to turbulent the airflow inside the tower body. The exterior of the drive assembly is provided with a telescopic cleaning assembly, a magnetic rotation assembly, and a dust collection assembly from top to bottom. The telescopic cleaning assembly is used to clean the movable filter plate, the dust collection assembly is used to adsorb fine particles after filtration by the movable filter plate, and the magnetic rotation assembly is used to drive the movable filter plate.

[0007] By adopting the above technical solution and by setting up supporting drive components and gradient heating components, this design employs a cascade utilization method for flue gas waste heat. This not only enables the recovery and utilization of waste heat but also allows for its cascade utilization. Waste heat from different temperature ranges is recovered and used in different processes according to the principle of "high energy, high use; low energy, low use," thereby improving overall energy efficiency, avoiding the waste of high-grade heat energy, and enabling rapid heat concentration for rapid drying of the initial atomized liquid. This prevents the initial atomized wastewater from adhering to the inner wall of the upper section of the tower due to insufficient drying, thus avoiding impurity deposition and ensuring the continuous normal operation of the equipment.

[0008] As a further description of the above technical solution: The drive assembly includes a drive motor, which is fixedly installed at the bottom of the tower body. A mounting spindle is fixedly installed at one end of the output shaft of the drive motor, and an anti-splash plate is fixedly installed at the top of the mounting spindle. A heat radiation coating is provided on the inner wall of the anti-splash plate.

[0009] As a further description of the above technical solution: The bottom of the splash guard is provided with multiple bottom holes, a spiral fan blade is fixedly installed on the outside of the mounting spindle, and the atomizer is located at the center of the inner side of the splash guard.

[0010] As a further description of the above technical solution: The gradient heating component includes a main heat pipe, which is fixedly installed in a top hole on the top surface of the top cover. A heater is fixedly installed at the bottom end of the main heat pipe, and a temperature sensor is installed inside the heater. A heat inlet pipe is provided at the bottom of the heater.

[0011] As a further description of the above technical solution: A first branch heat pipe and a second branch heat pipe are provided on one side of the outer wall of the main heat pipe. A control valve is provided inside the main heat pipe, the first branch heat pipe and the second branch heat pipe. One end of the first branch heat pipe is fixedly connected to a side hole provided on the outer surface of the water storage tank, and one end of the second branch heat pipe is fixedly connected to the top of the exhaust gas processor.

[0012] As a further description of the above technical solution: The telescopic cleaning assembly includes a dispersing plate, an inner groove inside the dispersing plate, and a cleaning plate that is movably installed inside the inner groove via a built-in spring. The bottom end of the cleaning plate is in close contact with the top surface of the movable filter plate. Three sets of the dispersing plate and the cleaning plate are arranged circumferentially.

[0013] As a further description of the above technical solution: The magnetic rotation assembly includes a rotating ring, which is fixedly mounted on the outside of the mounting spindle by a mounting bracket provided on its inner side, and a plurality of top magnetic blocks are provided on the top surface of the rotating ring.

[0014] As a further description of the above technical solution: Multiple bottom magnetic blocks are provided on the bottom surface of the movable filter plate, and the top magnetic block has the same magnetic pole as the bottom magnetic block. The top surface of the rotating ring is in close contact with the bottom surface of the movable filter plate.

[0015] As a further description of the above technical solution: The dust collection assembly includes a bag filter, which is fixedly installed outside the mounting shaft. The bag filter is conical and has multiple side grooves on its outer side.

[0016] As a further description of the above technical solution: An inclined shaft is rotatably installed inside the side groove, and a rolling wheel and a cleaning brush are fixedly installed outside the inclined shaft. The rolling wheel is in rolling connection with the inner bottom surface of the tower body, and multiple waste discharge ports are provided on the outer bottom wall of the tower body.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by providing a driving component and a gradient heating component, during wastewater treatment, wastewater is first injected into a storage tank. At this time, waste heat from the flue gas in the medium-temperature section is introduced. The temperature sensor detects the temperature and controls the control valve in the first branch heat pipe to open. At this time, the waste heat at this temperature can be introduced into the storage tank through the first branch heat pipe for preheating treatment of the wastewater. Then, waste heat from the flue gas in the high-temperature section is introduced. At this time, the temperature sensor detects the temperature and controls the control valve in the main heat pipe to open. At this time, the waste heat at this temperature can be introduced into the tower body through the main heat pipe. During operation, the atomizer is turned on to atomize the preheated wastewater and spray it out in a rotating manner. The sprayed atomized liquid can remain inside the anti-splash plate, and the high-temperature gas can also be concentrated inside the anti-splash plate through the heat radiation material on the inner wall of the anti-splash plate, so that the high-temperature gas comes into contact with the atomized liquid and dries it quickly, causing some solid impurities to evaporate and precipitate. The drive motor is turned on simultaneously. The spiral fan blades and the anti-splash plate rotate synchronously. The spiral fan blades turbulent the high-temperature gas, causing it to be conducted spirally through the airflow spiral grooves, continuously drying the atomized liquid. Finally, the exhaust gas in the tower can be introduced into the exhaust gas processor through the exhaust gas duct for further treatment. At this time, the waste heat of the flue gas in the low-temperature section can be introduced into the exhaust gas processor for use. Through this design, a cascade utilization method of flue gas waste heat is adopted, which not only realizes the recovery and utilization of waste heat, but also realizes the cascade utilization of waste heat. Waste heat in different temperature ranges is recovered and used for different processes in stages according to the principle of "high energy high use, low energy low use", so as to improve the overall energy utilization rate, avoid the waste of high-grade heat energy, and at the same time, it can enable the heat to be quickly concentrated, so as to quickly dry the initial atomized liquid, preventing the initial atomized wastewater from not being dried quickly and adhering to the inner wall of the upper section of the tower, avoiding the deposition of impurities, and continuously ensuring the normal operation of the equipment.

[0018] 2. In this invention, by incorporating a movable filter plate, a telescopic cleaning component, and a magnetic rotation component, solid impurities generated after the atomized liquid is dried can be filtered once by the movable filter plate. When the drive motor is working, it can also synchronously drive the rotating ring to rotate. When the rotating ring rotates, when the top magnetic block of the rotating ring approaches the bottom magnetic block on the bottom surface of the movable filter plate, a repulsive force is generated because their magnetic poles are the same, causing the movable filter plate to move upward. When they move away, the movable filter plate falls back to its original position. This process repeats, achieving vibration of the movable filter plate. At the same time, the telescopic cleaning component can also be driven by the drive motor to rotate synchronously. The cleaning plate can continuously scrape on the movable filter plate and adaptively extend and retract with the rise and fall of the movable filter plate. Through this design, the filtration of dried solid impurities can be completed. At the same time, the filter structure can continuously vibrate periodically and simultaneously move the impurities on the filter structure in real time, effectively preventing impurities from accumulating on the movable filter plate, avoiding clogging of the movable filter plate mesh, ensuring the filtration effect, and periodically removing impurities for waste utilization.

[0019] 3. In this invention, by incorporating a dust collection component, after initial filtration through the movable filter plate, some fine particulate impurities can continue to move downwards to the bottom of the tower. At this point, the dust collection component can also be driven to rotate by the drive motor. During this process, the rotating bag filter can adsorb and process fine impurities. Simultaneously, the rolling wheel continuously rolls on the inner surface of the bottom of the tower, driving the cleaning brush to rotate continuously, achieving continuous cyclic cleaning of the inner wall of the bottom of the equipment. This prevents fine dust from adhering to the inner wall of the equipment, ensuring the continuous dust removal effect of the bag filter and further improving the application effect of the equipment. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0021] Figure 2 This is a three-dimensional structural diagram of a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat, taken from another angle.

[0022] Figure 3 This is a schematic diagram of the exploded three-dimensional structure of a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0023] Figure 4 This is a cross-sectional three-dimensional structural diagram of a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0024] Figure 5 This is a schematic diagram of the exploded three-dimensional structure of a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0025] Figure 6This is a schematic diagram of the combined three-dimensional structure of the drive components in a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0026] Figure 7 This is an exploded three-dimensional structural diagram of the driving component in a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0027] Figure 8 This is a schematic diagram of the exploded three-dimensional structure of a dust collection component in a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0028] Figure 9 This is an exploded three-dimensional structural diagram of a telescopic cleaning component in a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0029] Figure 10 This is a three-dimensional structural diagram of a movable filter plate in a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat.

[0030] Legend: 1. Tower; 2. Gradient heating assembly; 201. Main heat pipe; 202. First branch heat pipe; 203. Second branch heat pipe; 204. Heater; 205. Heat inlet pipe; 3. Water storage tank; 4. Tower body; 5. Exhaust gas duct; 6. Exhaust gas processor; 7. Waste discharge port; 8. Drive assembly; 801. Spiral fan blade; 802. Drive motor; 803. Mounting spindle; 804. Anti-splash plate; 805. Bottom hole; 9. Exhaust pipe; 10. Water inlet pipe; 11. Airflow screw 12. Swirl; 12. Dust collection assembly; 121. Side trough; 122. Bag filter; 123. Rolling wheel; 124. Cleaning brush; 125. Inclined shaft; 13. Movable filter plate; 14. Telescopic cleaning assembly; 141. Dispersing plate; 142. Inner trough; 143. Built-in spring; 144. Cleaning plate; 15. Movable trough; 16. Atomizer; 17. Inspection door; 18. Magnetic rotation assembly; 181. Rotary ring; 182. Top magnetic block; 183. Mounting bracket; 19. Bottom magnetic block; 20. Top cover. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0032] Please see Figures 1-10The present invention provides a technical solution: a desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat, including a tower frame 1, a tower body 4 arranged on the inner side of the tower frame 1, a top cover 20 arranged on the top of the tower body 4, a water storage tank 3 arranged on the top surface of the top cover 20, a water inlet pipe 10 arranged on one side of the outer wall of the water storage tank 3, an atomizer 16 arranged at the bottom of the top cover 20, an exhaust gas duct 5 arranged on one side of the outer wall of the tower body 4, one end of the exhaust gas duct 5 is connected to an exhaust gas processor 6, an exhaust pipe 9 is arranged on the other side of the outer wall of the tower body 4, and an inspection door 17 is installed on the outer side of the tower body 4 via a hinge.

[0033] The drive assembly 8 and the gradient heating assembly 2 are installed on the top cover 20. The gradient heating assembly 2 is used to supply waste heat in different flue gas stages. The inner surface of the tower body 4 is provided with an airflow spiral groove 11 and a movable groove 15. A movable filter plate 13 is movably installed in the movable groove 15. The drive assembly 8 is used to turbulent the airflow inside the tower body 4. The exterior of the drive assembly 8 is provided with a telescopic cleaning assembly 14, a magnetic rotation assembly 18 and a dust collection assembly 12 arranged sequentially from top to bottom. The telescopic cleaning assembly 14 is used to clean the movable filter plate 13. The dust collection assembly 12 is used to adsorb fine particles after filtration by the movable filter plate 13. The magnetic rotation assembly 18 is used to drive the movement of the movable filter plate 13.

[0034] The drive assembly 8 includes a drive motor 802, which is fixedly installed at the bottom of the tower body 4. A mounting spindle 803 is fixedly installed at one end of the output shaft of the drive motor 802. An anti-splash plate 804 is fixedly installed at the top of the mounting spindle 803. A heat radiation coating is provided on the inner wall of the anti-splash plate 804. Multiple bottom holes 805 are provided at the bottom of the anti-splash plate 804. A spiral fan blade 801 is fixedly installed on the outside of the mounting spindle 803. The atomizer 16 is located at the center of the inner side of the anti-splash plate 804.

[0035] The gradient heating component 2 includes a main heat pipe 201, which is fixedly installed in a top hole on the top surface of the top cover 20. A heater 204 is fixedly installed at the bottom end of the main heat pipe 201. A temperature sensor is installed inside the heater 204. A heat inlet pipe 205 is installed at the bottom of the heater 204. A first branch heat pipe 202 and a second branch heat pipe 203 are installed on one side of the outer wall of the main heat pipe 201. A control valve is installed inside the main heat pipe 201, the first branch heat pipe 202 and the second branch heat pipe 203. One end of the first branch heat pipe 202 is fixedly connected to a side hole on the outer surface of the water storage tank 3. One end of the second branch heat pipe 203 is fixedly connected to the top of the exhaust gas processor 6.

[0036] Furthermore, during wastewater treatment, wastewater is first injected into the storage tank 3. At this time, waste heat from the flue gas in the medium-temperature section is introduced. The temperature sensor detects the temperature and controls the control valve in the first branch heat pipe 202 to open. The waste heat at this temperature can then be introduced into the storage tank 3 through the first branch heat pipe 202 for preheating the wastewater. Then, waste heat from the flue gas in the high-temperature section is introduced. The temperature sensor detects the temperature and controls the control valve in the main heat pipe 201 to open. The waste heat at this temperature can then be introduced into the tower body 4 through the main heat pipe 201. During operation, the atomizer 16 is turned on to atomize the preheated wastewater and spray it out in a rotating manner. The sprayed atomized liquid can be stored in the anti-splash zone. Inside the plate 804, the high-temperature gas can also be concentrated on the inside of the anti-splash plate 804 through the heat radiation material on the inner wall of the anti-splash plate 804, so that the high-temperature gas comes into contact with the atomizing liquid and dries it quickly, causing some solid impurities to evaporate and precipitate. The drive motor 802 is turned on synchronously, controlling the spiral fan blade 801 to rotate synchronously with the anti-splash plate 804. The spiral fan blade 801 turbulents the high-temperature gas, so that the high-temperature gas is spirally conducted through the airflow spiral groove 11, continuously drying the atomizing liquid. Finally, the exhaust gas in the tower can be introduced into the exhaust gas processor 6 through the exhaust gas duct 5 for further treatment. At this time, the waste heat of the flue gas in the low-temperature section can be introduced into the exhaust gas processor 6 for use.

[0037] This design employs a cascaded utilization method for waste heat from flue gas. This not only enables the recovery and reuse of waste heat but also allows for its cascaded utilization. Waste heat from different temperature ranges is recovered and used in different processes according to the principle of "high energy, high use; low energy, low use," thereby improving overall energy efficiency, avoiding the waste of high-grade heat energy, and enabling rapid heat concentration for quick drying of the initial atomized liquid. This prevents undried wastewater from adhering to the inner wall of the upper section of the tower, avoiding impurity deposition and ensuring the continuous normal operation of the equipment.

[0038] Please see Figures 7-9 The telescopic cleaning assembly 14 includes a dispersing plate 141, an inner groove 142 is provided inside the dispersing plate 141, and a cleaning plate 144 is movably installed inside the inner groove 142 by a built-in spring 143. The bottom end of the cleaning plate 144 is in close contact with the top surface of the movable filter plate 13. The dispersing plate 141 and the cleaning plate 144 are arranged in three sets in a circle.

[0039] The magnetic rotation assembly 18 includes a rotating ring 181, which is fixedly mounted on the outside of the mounting spindle 803 by a mounting bracket 183 provided on its inner side. A plurality of top magnetic blocks 182 are provided on the top surface of the rotating ring 181.

[0040] Multiple bottom magnetic blocks 19 are provided on the bottom surface of the movable filter plate 13. The top magnetic block 182 has the same magnetic pole as the bottom magnetic block 19. The top surface of the rotating ring 181 is in close contact with the bottom surface of the movable filter plate 13.

[0041] Furthermore, solid impurities generated after the atomized liquid is dried can be filtered once through the movable filter plate 13. When the drive motor 802 is working, it can also drive the rotating ring 181 to rotate synchronously. When the rotating ring 181 rotates, when the top magnetic block 182 of the rotating ring 181 approaches the bottom magnetic block 19 on the bottom surface of the movable filter plate 13, since the magnetic poles of the two are the same, a repulsive force is generated, causing the movable filter plate 13 to move upward. When the two move away, the movable filter plate 13 falls back to its original position. This process is repeated to achieve the vibration of the movable filter plate 13. At the same time, the telescopic cleaning component 14 can also be driven by the drive motor 802 to rotate synchronously. The cleaning plate 144 can continuously scrape on the movable filter plate 13 and will adaptively extend and retract as the movable filter plate 13 rises and falls.

[0042] This design enables the filtration of dried solid impurities. Simultaneously, it allows the filter structure to vibrate continuously and periodically, thereby agitating the impurities on the filter structure in real time. This effectively prevents impurities from accumulating on the movable filter plate 13, avoiding clogging of the mesh of the movable filter plate 13, ensuring the filtration effect, and allowing the impurities to be removed periodically for waste utilization.

[0043] Please see Figure 8 The dust collection assembly 12 includes a bag filter 122, which is fixedly installed on the outside of the mounting main shaft 803. The bag filter 122 is conical, and multiple side grooves 121 are provided on the outside of the bag filter 122. An inclined shaft 125 is rotatably installed inside the side groove 121. A rolling wheel 123 and a cleaning brush 124 are fixedly installed on the outside of the inclined shaft 125. The rolling wheel 123 is in rolling connection with the bottom inner surface of the tower body 4. Multiple waste discharge ports 7 are provided on the bottom outer wall of the tower body 4.

[0044] Furthermore, after filtration by the movable filter plate 13, some fine particulate impurities can continue to move downwards to the bottom of the tower body 4. At this time, the dust collection component 12 can also be driven to rotate by the drive motor 802. During this process, the rotating bag filter 122 can adsorb and process fine impurities. At the same time, the rolling wheel 123 can continuously roll on the inner surface of the bottom of the tower body 4, while driving the cleaning brush 124 to rotate continuously, realizing continuous cyclic cleaning of the inner wall of the bottom of the equipment, avoiding fine dust from adhering to the inner wall of the equipment, ensuring the continuous dust removal effect of the bag filter 122, and further improving the application effect of the equipment.

[0045] Working Principle: During wastewater treatment, wastewater is first injected into the storage tank 3. At this time, waste heat from the flue gas in the medium-temperature section is introduced. A temperature sensor detects the temperature and controls the opening of the control valve in the first branch heat pipe 202. The waste heat at this temperature is then introduced into the storage tank 3 through the first branch heat pipe 202 for preheating the wastewater. Then, waste heat from the flue gas in the high-temperature section is introduced. A temperature sensor detects the temperature and controls the opening of the control valve in the main heat pipe 201. The waste heat at this temperature is then introduced into the tower body 4 through the main heat pipe 201. During operation, the atomizer 16 is turned on to atomize the preheated wastewater and spray it out in a rotating manner. The sprayed atomized liquid can be retained to prevent splashing. The high-temperature gas can be concentrated on the inner side of the anti-splash plate 804 through the heat radiation material on the inner wall of the anti-splash plate 804, so that the high-temperature gas comes into contact with the atomized liquid and dries it quickly, causing some solid impurities to evaporate and precipitate. The drive motor 802 is turned on synchronously, controlling the spiral fan blade 801 and the anti-splash plate 804 to rotate synchronously. The spiral fan blade 801 turbulentizes the high-temperature gas, so that the high-temperature gas is spirally conducted through the airflow spiral groove 11, continuously drying the atomized liquid. Finally, the exhaust gas in the tower can be introduced into the exhaust gas processor 6 through the exhaust gas duct 5 for further treatment. At this time, the waste heat of the flue gas in the low-temperature section can be introduced into the exhaust gas processor 6 for use. Solid impurities generated after the atomized liquid is dried can be filtered once through the movable filter plate 13. When the drive motor 802 is working, it can also drive the rotating ring 181 to rotate synchronously. When the rotating ring 181 rotates, when the top magnetic block 182 of the rotating ring 181 approaches the bottom magnetic block 19 on the bottom surface of the movable filter plate 13, since the magnetic poles of the two are the same, a repulsive force is generated, causing the movable filter plate 13 to move upward. When the two move away, the movable filter plate 13 falls back to its original position. This process is repeated to achieve the vibration of the movable filter plate 13. At the same time, the telescopic cleaning component 14 can also be driven by the drive motor 802 to rotate synchronously. The cleaning plate 144 can continuously scrape on the movable filter plate 13 and will adaptively extend and retract with the rise and fall of the movable filter plate 13 to move impurities and avoid accumulation. After being filtered once by the movable filter plate 13, some fine particulate impurities can continue to move downwards and reach the bottom of the tower body 4. At this time, the dust collection component 12 can also be driven to rotate by the drive motor 802. During this process, the rotating bag dust collector 122 can achieve adsorption and treatment of fine impurities. At the same time, the rolling wheel 123 can continuously roll on the inner surface of the bottom of the tower body 4, while driving the cleaning brush 124 to rotate continuously, so as to achieve continuous cyclic cleaning of the inner wall of the bottom of the equipment, avoid fine dust adhering to the inner wall of the equipment, and ensure the continuous dust removal effect of the bag dust collector 122.

[0046] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat, comprising a tower frame (1), characterized in that: The tower (1) has a tower body (4) on its inner side, a top cover (20) on the top of the tower body (4), a water tank (3) on the top surface of the top cover (20), a water inlet pipe (10) on one side of the outer wall of the water tank (3), an atomizer (16) on the bottom of the top cover (20), an exhaust gas duct (5) on one side of the outer wall of the tower body (4), an exhaust gas processor (6) connected to one end of the exhaust gas duct (5), an exhaust pipe (9) on the other side of the outer wall of the tower body (4), and an inspection door (17) installed on the outer side of the tower body (4) via a hinge. The drive assembly (8) and the gradient heating assembly (2) are provided on the top cover (20). The gradient heating assembly (2) is used to supply different flue gas waste heat levels. The inner surface of the tower body (4) is provided with an airflow spiral groove (11) and a movable groove (15). A movable filter plate (13) is movably installed in the movable groove (15). The drive assembly (8) is used to turbulent the airflow in the tower body (4). The drive assembly (8) is provided with a telescopic cleaning assembly (14), a magnetic rotation assembly (18) and a dust collection assembly (12) from top to bottom. The telescopic cleaning assembly (14) is used to clean the movable filter plate (13). The dust collection assembly (12) is used to adsorb fine particles after filtration by the movable filter plate (13). The magnetic rotation assembly (18) is used to drive the movable filter plate (13).

2. The desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 1, characterized in that, The drive assembly (8) includes a drive motor (802), which is fixedly installed at the bottom of the tower body (4). One end of the output shaft of the drive motor (802) is fixedly installed with a mounting spindle (803), and the top end of the mounting spindle (803) is fixedly installed with an anti-splash plate (804). The inner wall of the anti-splash plate (804) is provided with a heat radiation coating.

3. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 2, characterized in that, The bottom of the splash guard (804) is provided with multiple bottom holes (805), the outside of the mounting spindle (803) is fixedly mounted with a spiral fan (801), and the atomizer (16) is located at the center of the inner side of the splash guard (804).

4. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 3, characterized in that, The gradient heating component (2) includes a main heat pipe (201), which is fixedly installed in a top hole on the top surface of the top cover (20). A heater (204) is fixedly installed at the bottom end of the main heat pipe (201). A temperature sensor is installed inside the heater (204), and a heat inlet pipe (205) is installed at the bottom of the heater (204).

5. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 4, characterized in that, A first branch heat pipe (202) and a second branch heat pipe (203) are provided on one side of the outer wall of the main heat pipe (201). A control valve is provided inside the main heat pipe (201), the first branch heat pipe (202) and the second branch heat pipe (203). One end of the first branch heat pipe (202) is fixedly connected to a side hole provided on the outer surface of the water storage tank (3). One end of the second branch heat pipe (203) is fixedly connected to the top of the exhaust gas processor (6).

6. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 5, characterized in that, The telescopic cleaning assembly (14) includes a dispersing plate (141), an inner groove (142) is provided inside the dispersing plate (141), and a cleaning plate (144) is movably installed inside the inner groove (142) by a built-in spring (143). The bottom end of the cleaning plate (144) is in close contact with the top surface of the movable filter plate (13). The dispersing plate (141) and the cleaning plate (144) are arranged in three sets in a circle.

7. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 6, characterized in that, The magnetic rotation assembly (18) includes a rotating ring (181), which is fixedly mounted on the outside of the mounting spindle (803) by a mounting bracket (183) provided on its inner side. A plurality of top magnetic blocks (182) are provided on the top surface of the rotating ring (181).

8. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 7, characterized in that, The bottom surface of the movable filter plate (13) is provided with a plurality of bottom magnetic blocks (19), the top magnetic block (182) has the same magnetic pole as the bottom magnetic block (19), and the top surface of the rotating ring (181) is in close contact with the bottom surface of the movable filter plate (13).

9. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 8, characterized in that, The dust collection assembly (12) includes a bag filter (122), which is fixedly installed on the outside of the mounting spindle (803). The bag filter (122) is conical, and multiple side grooves (121) are provided on the outside of the bag filter (122).

10. A desulfurization wastewater spray drying tower based on the cascade utilization of flue gas waste heat according to claim 9, characterized in that, An inclined shaft (125) is rotatably installed inside the side groove (121). A rolling wheel (123) and a cleaning brush (124) are fixedly installed on the outside of the inclined shaft (125). The rolling wheel (123) is rotatably connected to the bottom inner surface of the tower body (4). Multiple waste discharge ports (7) are provided on the bottom outer wall of the tower body (4).

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