Wastewater purification equipment for power generation tail gas desulfurization treatment

Abstract

The invention discloses wastewater purification equipment for power generation tail gas desulfurization treatment, and belongs to the technical field of wastewater purification treatment.The wastewater purification equipment comprises a purification tank, a plurality of runners are arranged in the purification tank in a staggered mode, a water inlet end is arranged at the end, close to the front face, of the left side of the purification tank, and a filtering tank is fixedly installed on the right side of the purification tank; the interior of the purification tank extends to the exterior to be provided with a purification mechanism and a dosing mechanism, and the interior of the filter tank is provided with a filter mechanism. Wastewater continuously flows in the flow channel of the purification tank, the wastewater can be fully mixed with chemicals in the flowing process through the chemical feeding mechanism and the purification mechanism, the wastewater is filtered, flocculent precipitates are directly separated from the treated wastewater, real continuous water feeding and discharging are achieved through the design of the flow channel, and the wastewater treatment efficiency is improved. Not only are the phenomena of short flow and dead zone avoided, but also the waiting time between batches is eliminated, and the processing capacity per unit time is larger.

Description

Technical Field

[0001] This invention relates to the field of wastewater purification and treatment technology, and in particular to a wastewater purification device for desulfurization treatment of power generation exhaust gas. Background Technology

[0002] During thermal power generation, a large amount of polluting exhaust gas is produced. To protect the environment, it is necessary to control the emission of acidic pollutants such as sulfur dioxide in the exhaust gas. Therefore, the exhaust gas needs to undergo desulfurization treatment before being emitted. Currently, the wet desulfurization process is used to desulfurize the exhaust gas. After treatment, it generates a large amount of wastewater containing pollutants and impurities. If this wastewater is discharged directly, it will pollute the environment. Therefore, the wastewater from the desulfurization treatment of the exhaust gas needs to be purified.

[0003] Currently, the treatment of wastewater from flue gas desulfurization is often carried out using a three-tank system. The wastewater is first fed into a reaction tank for chemical reaction, then into a flocculation tank for flocculation, and finally into a sedimentation tank for settling. The precipitate is then scraped off using a sludge scraper, and the supernatant is also discharged. However, in practical use, the traditional three-tank process suffers from several drawbacks. Each tank is a completely mixed reactor with a wide hydraulic retention time distribution, which easily leads to short-circuiting and dead zones. This results in insufficient utilization of effective reaction and sedimentation time, limiting the treatment capacity per unit volume. Furthermore, the three-tank system is large, requiring a significant floor space. Therefore, a wastewater purification device for flue gas desulfurization in power generation is needed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wastewater purification device for desulfurization treatment of power generation exhaust gas.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wastewater purification device for desulfurization treatment of power generation tail gas includes a purification tank with multiple flow channels arranged in an alternating pattern inside the purification tank. A water inlet is provided on the left side of the purification tank near the front end. A filter tank is fixedly installed on the right side of the purification tank. A drain tank is provided on the right side of the filter tank. A purification mechanism and a dosing mechanism are provided inside the purification tank and outside the filter tank. A filter mechanism is provided inside the filter tank. The purification mechanism includes a mounting slot, which is fixedly installed inside the flow channel. Multiple spiral mixing blades are fixedly installed inside the mounting slot. Multiple mounting plates are fixedly installed on the top of the purification tank. A flow-blocking plate is rotatably installed between the inside of the mounting plate and the bottom of the purification tank. A connecting rod and a pushing rod are rotatably installed on the top of the flow-blocking plate, penetrating the outside of the mounting plate. A mounting base is fixedly installed on the left side of the purification tank. A hydraulic rod is rotatably installed inside the mounting base, and the end of the hydraulic rod away from the mounting base is rotatably installed on the left side of the pushing rod. A stirring unit is provided on the back of the purification tank extending into the interior.

[0006] Preferably, the mounting plate has an arc-shaped groove inside and the bottom of the purification tank, and the top and bottom of the flow-blocking plate are movably installed inside the arc-shaped groove.

[0007] Preferably, the agitation unit includes a mounting shell, which is fixedly installed on the back of the purification tank. A first motor is fixedly installed inside the mounting shell. Multiple agitators are rotatably installed inside the flow channel on the side of the purification tank near the back. The middle agitator is fixedly installed between itself and the output end of the first motor. A synchronous pulley is fixedly installed through the back of the agitator and through the back of the purification tank. A synchronous belt is installed between two adjacent synchronous pulleys for transmission.

[0008] Preferably, the dosing mechanism includes multiple fixed plates, which are fixedly installed on the top of the purification tank. A dosing pipe is fixedly installed inside the fixed plate, and multiple dosing nozzles are fixedly installed outside the dosing pipe. A connecting pipe is fixedly installed at the top of the dosing pipe, and a dosing pump is fixedly installed at the end of the connecting pipe away from the dosing pipe. A suction pipe is fixedly installed outside the dosing pump, and a storage tank is fixedly installed at the end of the suction pipe away from the dosing pump. A filling port is provided at the top of the storage tank, and an installation cap is threaded onto the external part of the filling port.

[0009] Preferably, the dosing mechanism is provided in multiple ways, and the interior of the multiple channels is repeatedly provided with a dosing tube, a spiral mixing impeller and a flow baffle plate from front to back.

[0010] Preferably, the filtration mechanism includes a separation chamber, which is fixedly installed inside the filter tank. A liquid pump is fixedly installed inside the separation chamber, and an outlet pipe and a suction pipe are fixedly installed outside the liquid pump. Two side supports and a central support are fixedly installed inside the filter tank. A sieve cylinder is rotatably installed inside the side supports, and a spiral plate is fixedly installed inside the sieve cylinder. A discharge groove is fixedly installed on the front side of the side support near the front. An installation bracket is fixedly installed on the top of the central support, and a second motor is fixedly installed outside the installation bracket. A gear is fixedly installed at the output end of the second motor. A gear ring is fixedly installed outside the center of the sieve cylinder, and the gear ring meshes with the gear.

[0011] Preferably, the back of the sieve cylinder has an inlet hole, and the end of the outlet pipe away from the pump is located inside the inlet hole, while the sieve cylinder is rotatably mounted outside the end of the outlet pipe away from the pump.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the purification mechanism, wastewater continuously flows inside the channel during use, and the spiral mixing impeller guides the wastewater to swirl, ensuring thorough mixing of the wastewater and the chemical solution. The baffle plate structure further obstructs the flow, allowing sufficient reaction time between the wastewater and the chemical solution. The rotation and agitation of the baffle plate also ensures more uniform mixing, eliminating the need for batch switching as required by traditional triplet systems. This allows for continuous treatment, avoiding "short-circuit" and "dead zones," and eliminating waiting time between batches. It also results in a higher processing capacity per unit time. Furthermore, compared to the traditional triplet structure, it consists of only one purification tank and one filter tank, resulting in a smaller footprint. 2. Through the set dosing mechanism, different liquid chemicals are filled inside the storage tank during use. According to the requirements of wastewater treatment, they are added in sequence and then evenly distributed into the wastewater through the dosing nozzle. This ensures that the liquid chemicals are evenly distributed inside the wastewater, which facilitates the full reaction and mixing of the liquid chemicals with the wastewater in the subsequent process. 3. Through the set filtration mechanism, during use, the wastewater containing flocs is sent into the screen cylinder by the liquid pump. The screen cylinder is driven to rotate by the second motor, and the wastewater and flocs are quickly separated by centrifugal force. The filtered clean water is directly discharged into the drainage tank, without the need to set up an additional sedimentation tank and sludge scraping device. Compared with the traditional process, the sedimentation and sludge scraping steps are eliminated. In addition, the spiral plate set inside the screen cylinder can directly collect and discharge the flocs, thereby realizing continuous filtration treatment of wastewater. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the external structure of the present invention; Figure 2 This is a rear view structural schematic diagram of the present invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a schematic diagram of the mounting groove and the external structure of the connected mechanism of the present invention. Figure 5 This is a schematic diagram of the external structure of the spiral mixing propeller of the present invention; Figure 6 This is a schematic diagram of the purification tank and connected mechanism of the present invention, shown in a front cross-sectional view. Figure 7 This is a schematic diagram of the hydraulic rod and its connected mechanism, representing the external structure of the present invention. Figure 8 This is an exploded structural diagram of the flow-blocking plate and its connected mechanism, which is a schematic diagram of the present invention. Figure 9 This is a schematic diagram of the appearance and structure of the flow-blocking plate and the connected mechanism of the present invention. Figure 10 This is a schematic diagram of the external structure of the agitation unit of the present invention; Figure 11 This is a schematic diagram of the appearance and structure of the stirring paddle and the connected mechanism of the present invention. Figure 12 This is an exploded view of the drug delivery mechanism of the present invention. Figure 13 This is a schematic diagram of the external structure of the filter tank and the connected mechanism of the present invention. Figure 14 This is a schematic diagram of the external structure of the filter mechanism of the present invention; Figure 15 This is a schematic cross-sectional view of the sieve cylinder and its connected mechanism, which is a schematic diagram of the present invention.

[0014] In the diagram: 1. Purification tank; 2. Flow channel; 3. Water inlet; 4. Filter tank; 5. Purification mechanism; 51. Mounting slot; 52. Spiral mixing impeller; 53. Mounting plate; 54. Baffle plate; 55. Connecting rod; 56. Push rod; 57. Mounting base; 58. Hydraulic rod; 59. Agitator unit; 591. Mounting casing; 592. First motor; 593. Agitator; 594. Synchronous pulley; 595. Synchronous belt; 6. Dosing mechanism; 61. Fixing plate; 62. 63. Dosing pipe; 64. Dosing nozzle; 65. Connecting pipe; 66. Dosing pump; 67. Extraction pipe; 68. Storage tank; 69. Filling port; 70. Mounting cover; 71. Filtering mechanism; 72. Separation chamber; 73. Liquid extraction pump; 74. Discharge pipe; 75. Extraction pipe; 76. Side support; 77. Central support; 78. Screen cylinder; 79. Spiral plate; 70. Discharge chute; 710. Mounting bracket; 711. Second motor; 712. Gear; 713. Gear ring. Detailed Implementation

[0015] See Figures 1-3 A wastewater purification device for desulfurization treatment of power generation tail gas includes a purification tank 1, with multiple flow channels 2 arranged in an alternating pattern inside the purification tank 1. A water inlet 3 is provided on the left side of the purification tank 1 near the front end. A filter tank 4 is fixedly installed on the right side of the purification tank 1. A drainage tank is provided on the right side of the filter tank 4. A purification mechanism 5 and a dosing mechanism 6 are provided inside the purification tank 1 and outside. A filter mechanism 7 is provided inside the filter tank 4.

[0016] In the existing triplet treatment process, desulfurization wastewater is first transported to the reaction tank, where appropriate reagents are added to complete the chemical reaction. Then, the wastewater after the reaction is introduced into the flocculation tank, where floc particles are formed through flocculation. Finally, it enters the sedimentation tank to achieve solid-liquid separation. The bottom sediment is discharged with the help of a sludge scraper, and the clear liquid on the top is collected and discharged after meeting the standards. However, each tank adopts a completely mixed reactor configuration, which has a high dispersion of hydraulic residence time distribution. It is very easy to have "short flow" and "dead zone" phenomena, which makes it difficult to make full use of the effective time for reaction and sedimentation. The wastewater treatment efficiency per unit volume of the equipment is limited. In addition, the traditional triplet device has a large tank size and a high site area occupancy rate.

[0017] This invention achieves continuous wastewater treatment by continuously flowing wastewater through the flow channel 2 of the purification tank 1 and uniformly adding chemicals to the wastewater through the dosing mechanism 6. Simultaneously, the purification mechanism 5 ensures thorough mixing of the wastewater and chemicals during the flow process. After mixing, the wastewater is filtered to separate flocculent precipitates directly from the treated wastewater, thus realizing continuous wastewater treatment. Compared to the intermittent or semi-continuous batch processing mode of the traditional "three-tank" system, the flow channel 2 design achieves truly continuous inflow and outflow, avoiding "short-circuit" and "dead zones," eliminating waiting time between batches, increasing the processing capacity per unit time, and requiring less floor space. This design aligns better with the trend of modern industrial processes towards intensification and automation.

[0018] See Figures 4-11 The purification mechanism 5 includes an installation groove 51, which is intermittently fixed inside the flow channel 2. Multiple spiral mixing blades 52 are fixedly installed inside the installation groove 51. The spiral mixing blades 52 are formed by interlacing and welding multiple spiral blades, so that when the wastewater passes through the spiral mixing blades 52, it can be swirled and mixed in the spiral mixing blades 52, so that the wastewater and the agent are mixed. Multiple installation plates 53 are fixedly installed on the top of the purification tank 1. A flow-blocking plate 54 is rotatably installed between the inside of the installation plate 53 and the bottom of the purification tank 1. A connecting rod 55 and a pushing rod 56 are rotatably installed through the outside of the installation plate 53 on the top of the flow-blocking plate 54. An installation seat 57 is fixedly installed on the left side of the purification tank 1. A hydraulic rod 58 is rotatably installed inside the installation seat 57, and the end of the hydraulic rod 58 away from the installation seat 57 is rotatably installed on the left side of the pushing rod 56. A stirring unit 59 is provided on the back of the purification tank 1.

[0019] The mounting plate 53 and the bottom of the purification tank 1 are provided with arc-shaped grooves, and the top and bottom of the baffle plate 54 are movably installed inside the arc-shaped grooves.

[0020] The agitation unit 59 includes a mounting shell 591, which is fixedly installed on the back of the purification tank 1. A first motor 592 is fixedly installed inside the mounting shell 591. Multiple agitators 593 are rotatably installed inside the flow channel 2 on the side of the purification tank 1 near the back. The middle agitator 593 is fixedly installed between the output end of the first motor 592. A synchronous pulley 954 is fixedly installed through the back of the agitator 593 through the back of the purification tank 1. A synchronous belt 595 is installed between two adjacent synchronous pulleys 954 to drive the multiple agitators 593 to rotate synchronously, so that the flocculent matter in the wastewater can be mixed with the wastewater and easily extracted together, avoiding the sedimentation of flocculent matter inside the flow channel 2.

[0021] Wastewater from the desulfurization tail gas treatment is fed into the flow channel 2 of the purification tank 1 through the inlet 3. Treatment agents are added to the wastewater through the dosing mechanism 6. The wastewater flows within the flow channel 2. When it flows into the next flow channel 2, the internal spiral mixing impeller 52 agitates the wastewater, ensuring uniform mixing of the agents and wastewater. The wastewater, after being mixed by the spiral mixing impeller 52, continues to flow. When it enters the next flow channel 2, the flow is blocked by a baffle plate 54, allowing sufficient time for the wastewater and agents to react. Simultaneously, a hydraulic rod 58 drives a push rod 56 to move, causing the push rod 56 to push the baffle plate... The flow plate 54 rotates on the mounting plate 53, and at the same time, the flow baffle 54 drives the adjacent flow baffle 54 to rotate synchronously through the connecting rod 55, so that multiple flow baffles 54 rotate synchronously. During the rotation, the flow baffles 54 agitate the wastewater, promote the combination reaction between the wastewater and the reagent, and when the flow baffle 54 faces the side wall of the flow channel 2, the wastewater flows. When the flow baffle 54 rotates and opens, it obstructs the flow of wastewater, allowing it to fully react with the reagent. Subsequently, the wastewater continues to flow to the next flow channel 2, and is dosed through another dosing mechanism 6, and the above operation is repeated to ensure that the wastewater and the reagent fully react.

[0022] When the wastewater has fully reacted and flows into the last channel 2, it is discharged through the filtration mechanism 7. In the last channel 2, the first motor 592 drives the stirring paddle 593 directly connected to it to rotate, so that the stirring paddle 593 drives the other stirring paddles 593 to rotate synchronously through the synchronous wheel 954 and the synchronous belt 595. This allows the stirring paddle 593 to mix the wastewater with the flocculent material generated in the wastewater, so that the filtration mechanism 7 can extract it synchronously and avoid the flocculent material from continuously settling inside the channel 2.

[0023] See Figure 12 The dosing mechanism 6 includes multiple fixed plates 61, which are fixedly installed on the top of the purification tank 1. A dosing pipe 62 is fixedly installed inside the fixed plate 61, and multiple dosing nozzles 63 are fixedly installed outside the dosing pipe 62. The spraying direction of the dosing nozzles 63 is the same as the water flow direction. A connecting pipe 64 is fixedly installed on the top of the dosing pipe 62. The connecting pipe 64 is provided with multiple branch pipes, which are fixedly installed to the dosing pipe 62 respectively. A drug delivery pump 65 is fixedly installed at the end of the connecting pipe 64 away from the dosing pipe 62. A drug extraction pipe 66 is fixedly installed outside the drug delivery pump 65. A drug storage tank 67 is fixedly installed at the end of the drug extraction pipe 66 away from the drug delivery pump 65. A filling port 68 is provided on the top of the drug storage tank 67, and an installation cap 69 is threaded onto the outside of the filling port 68.

[0024] Multiple dosing mechanisms 6 are provided, and the interior of multiple flow channels 2 is repeatedly provided with dosing pipes 62, spiral mixing propellers 52 and flow baffles 54 from front to back.

[0025] By opening the mounting cover 69, wastewater treatment agents are added into the storage tank 67. Then, the mounting cover 69 is closed, and the delivery pump 65 is started. The agent is drawn through the extraction pipe 66 connected to the storage tank 67 and delivered to the dosing pipe 62 through the connecting pipe 64. The agent is then sprayed into the flow channel 2 through the dosing nozzle 63 on the dosing pipe 62, so that it can combine with the wastewater in the flow channel 2. Through the array of multiple nozzles, the agent can be evenly distributed in the wastewater in the flow channel 2, thereby facilitating the subsequent reaction between the agent and the wastewater.

[0026] Among the multiple dosing mechanisms 6, the storage tanks 67 contain different liquid chemicals, which are added in sequence according to the requirements of wastewater treatment.

[0027] See Figures 13-15 The filtration mechanism 7 includes a separation chamber 71, which is fixedly installed inside the filter tank 4. A liquid pump 72 is fixedly installed inside the separation chamber 71. An outlet pipe 73 and a suction pipe 74 are fixedly installed outside the liquid pump 72. A drain hole is provided on the right side of the purification tank 1 near the back, and the suction pipe 74 is fixedly installed to the drain hole. Two side supports 75 and a central support 76 are fixedly installed inside the filter tank 4. A sieve cylinder 77 is rotatably installed inside the side supports 75. The central support 76 is located outside the center of the sieve cylinder 77. A spiral plate 78 is fixedly installed inside the screen cylinder 77. A discharge groove 79 is fixedly installed on the front side of the side support 75 near the front side. A mounting bracket 710 is fixedly installed on the top of the central support 76. A second motor 711 is fixedly installed on the outside of the mounting bracket 710. A gear 712 is fixedly installed on the output end of the second motor 711. A toothed ring 713 is fixedly installed on the outside of the center of the screen cylinder 77, and the toothed ring 713 meshes with the gear 712. The toothed ring 713 is located inside the central support 76 and is used to protect the toothed ring 713.

[0028] The back of the sieve cylinder 77 has an inlet hole, and the end of the outlet pipe 73 away from the pump 72 is located inside the inlet hole, while the sieve cylinder 77 is rotatably mounted on the outside of the end of the outlet pipe 73 away from the pump 72.

[0029] Wastewater mixed by the agitator 593 is drawn from the inside of the last flow channel 2 through the suction pipe 74 on the suction pump 72, and sent into the inside of the screen cylinder 77 through the discharge pipe 73. The second motor 711 drives the gear 712 to rotate, and the gear 712 drives the screen cylinder 77 to rotate on the side support and the central support 76 through the meshing gear ring 713. The screen cylinder 77 drives the internal spiral plate 78 to rotate. The rotation of the screen cylinder 77 filters the wastewater. The filtered wastewater flows into the filter tank 4 and is discharged through the drain trough on the filter tank 4. The spiral plate 78 inside the screen cylinder 77 transports the flocculent matter in the wastewater to the front of the screen cylinder 77 and discharges the flocculent matter through the discharge chute 79, thereby achieving the separation of flocculent matter in the wastewater.

[0030] In this invention, firstly, wastewater is sent to the flow channel 2 of the purification tank 1 through the inlet end 3, so that the wastewater flows inside the flow channel 2. The agent in the storage tank 67 is extracted through the liquid extraction pipe 74 and the liquid outlet pipe 73 on the drug delivery pump 65, and sent into the dosing pipe 62 through the connecting pipe 64. The agent is evenly sprayed into the interior of the wastewater through the dosing nozzle 63 on the dosing pipe 62. When the wastewater flows into the next flow channel 2, the internal spiral mixing impeller 52 agitates the wastewater, ensuring that the reagent and wastewater are mixed evenly. After being mixed by the spiral mixing impeller 52, the wastewater continues to flow. When it enters the next flow channel 2, the flow-blocking plate 54 obstructs the flow of the wastewater. At the same time, the hydraulic rod 58 drives the push rod 56 to move, causing the push rod 56 to push the flow-blocking plate 54 to rotate on the mounting plate 53. Simultaneously, the flow-blocking plate 54 drives another adjacent flow-blocking plate 54 to rotate synchronously through the connecting rod 55, causing multiple flow-blocking plates 54 to rotate synchronously. During the rotation, the flow-blocking plates 54 agitate the wastewater. The wastewater then continues to flow inside channel 2, undergoing repeated dosing, mixing, and flow restriction until a complete reaction is achieved. It then enters the last channel 2, where the first motor 592 drives multiple agitators 593 to rotate synchronously, ensuring thorough mixing. The mixed wastewater is then drawn from the last channel 2 through the extraction pipe 74 on the pump 72 and sent into the screen cylinder 77 through the outlet pipe 73. The second motor 711 drives the gear 712 to rotate, allowing the gear 712 to pass through… The meshing toothed ring 713 drives the screen cylinder 77 to rotate on the side support and the central support 76. The screen cylinder 77 drives the internal spiral plate 78 to rotate. The rotation of the screen cylinder 77 filters the wastewater. The filtered wastewater flows into the filter tank 4 and is discharged through the drain trough on the filter tank 4. The spiral plate 78 inside the screen cylinder 77 transports the flocculent matter in the wastewater. The spiral plate 78 transports the flocculent matter to the front of the screen cylinder 77 and discharges it through the discharge chute 79.

Claims

1. A waste water purification apparatus for power generation tail gas desulfurization treatment, comprising a purification tank (1), characterized in that, The inside of the purification tank (1) is staggered with multiple flow channels (2), the left side of the purification tank (1) is provided with a water inlet end (3) near the front end, the right side of the purification tank (1) is fixedly installed with a filter tank (4), the right side of the filter tank (4) is provided with a drainage tank, the inside of the purification tank (1) extends to the outside and is provided with a purification mechanism (5) and a dosing mechanism (6), and the inside of the filter tank (4) is provided with a filtering mechanism (7). The purification mechanism (5) comprises a mounting groove (51) fixedly installed in the inside of the flow channel (2), multiple spiral mixing paddles (52) fixedly installed in the inside of the mounting groove (51), multiple mounting plates (53) fixedly installed on the top of the purification tank (1), a flow resistance plate (54) rotatably installed between the inside of the mounting plate (53) and the bottom of the purification tank (1), a connecting rod (55) and a pushing rod (56) rotatably installed on the top of the flow resistance plate (54) and penetrating through the outside of the mounting plate (53), a mounting seat (57) fixedly installed on the left side of the purification tank (1), a hydraulic rod (58) rotatably installed in the inside of the mounting seat (57), and one end of the hydraulic rod (58) away from the mounting seat (57) rotatably installed on the left side of the pushing rod (56), and a flow stirring unit (59) extending to the inside of the back of the purification tank (1).

2. A power plant off-gas desulphurization treatment wastewater purification apparatus according to claim 1, characterized in that, Arc-shaped sliding grooves are formed in the inside of the mounting plate (53) and the bottom of the purification tank (1), and the top and bottom of the flow resistance plate (54) are movably installed in the arc-shaped sliding grooves.

3. A power plant off-gas desulphurization treatment wastewater purification apparatus according to claim 1, characterized in that, The flow stirring unit (59) comprises a mounting protective shell (591) fixedly installed on the back of the purification tank (1), a first motor (592) fixedly installed in the inside of the mounting protective shell (591), multiple stirring paddles (593) rotatably installed in the flow channels (2) near the back of the purification tank (1), the stirring paddles (593) fixedly installed between the output end of the first motor (592) and the middle, synchronous wheels (954) fixedly installed on the back of the stirring paddles (593) and penetrating through the back of the purification tank (1), and a synchronous belt (595) transmissionally installed between two adjacent synchronous wheels (954).

4. The power plant off-gas desulfurization treatment wastewater purification apparatus according to claim 1, characterized by The dosing mechanism (6) comprises multiple fixed plates (61) fixedly installed on the top of the purification tank (1), a dosing pipe (62) fixedly installed in the inside of the fixed plate (61), multiple dosing nozzles (63) fixedly installed on the outside of the dosing pipe (62), a connecting pipe (64) fixedly installed on the top of the dosing pipe (62), a medicine sending pump (65) fixedly installed on one end of the connecting pipe (64) away from the dosing pipe (62), a medicine drawing pipe (66) fixedly installed on the outside of the medicine sending pump (65), a medicine storage tank (67) fixedly installed on one end of the medicine drawing pipe (66) away from the medicine sending pump (65), a filling opening (68) formed on the top of the medicine storage tank (67), and a mounting cover (69) threadedly installed on the outside of the filling opening (68).

5. A power plant off-gas desulphurization treatment wastewater purification apparatus according to claim 4, characterized in that, The administration mechanism (6) is provided with multiple, the inside of multiple flow channel (2) from front to back is repeatedly provided with administration pipe (62), spiral mixing flow paddle (52), baffle (54).

6. A power plant off-gas desulphurization treatment wastewater purification apparatus according to claim 1, characterized in that, The filtering mechanism (7) comprises a separation bin (71) fixedly installed inside the filter tank (4), a liquid pumping pump (72) fixedly installed inside the separation bin (71), a liquid outlet pipe (73) and a liquid pumping pipe (74) fixedly installed outside the liquid pumping pump (72), two side supports (75) and a center support (76) fixedly installed inside the filter tank (4), a sieve cylinder (77) rotatably installed inside the side support (75), a spiral plate (78) fixedly installed inside the sieve cylinder (77), an exhaust chute (79) fixedly installed on the front side of the side support (75) close to the front, an installation support (710) fixedly installed on the top of the center support (76), a second motor (711) fixedly installed outside the installation support (710), a gear (712) fixedly installed on the output end of the second motor (711), a toothed ring (713) fixedly installed outside the center of the sieve cylinder (77), and the toothed ring (713) is engaged with the gear (712).

7. A power plant off-gas desulphurization treatment wastewater purification apparatus according to claim 6, characterized in that, The back of the sieve cylinder (77) is provided with an inlet hole, and one end of the liquid outlet pipe (73) away from the liquid pumping pump (72) is arranged inside the inlet hole, and the sieve cylinder (77) is rotatably installed outside the one end of the liquid outlet pipe (73) away from the liquid pumping pump (72).

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