A power plant wastewater advanced treatment and reuse system

Abstract

This invention discloses a deep treatment and reuse system for power plant wastewater, relating to the field of power plant wastewater treatment technology. It includes a base plate and a mixing tank mounted on top of the base plate. An aeration disc is installed at the bottom of the mixing tank, and an ammonia gas introduction, conversion, and recovery mechanism and a uniform liquid distribution mechanism are located on the top of the base plate. This deep treatment and reuse system, through the uniform liquid distribution mechanism, evenly sprays and diffuses the incoming liquid through multiple through-holes on the outer surface of the rotating cylinder into the surrounding area of ​​the mixing tank, thus dispersing the liquid. This ensures that the desulfurization wastewater and neutralization liquid are evenly distributed in the initial contact stage, improving the mixing uniformity of the two liquids and increasing the pollutant removal rate. It solves the problem in existing devices where desulfurization wastewater and neutralization liquid are directly discharged into the mixing tank through a single inlet, easily leading to uneven mixing, insufficient reaction, and reduced pollutant removal rate.

Description

Technical Field

[0001] This invention relates to the field of power plant wastewater treatment technology, specifically to a power plant wastewater deep treatment and reuse system. Background Technology

[0002] Sulfur dioxide is a harmful substance often emitted as waste gas from power plants. If this waste gas is released into the atmosphere, it causes serious environmental pollution and poses a significant threat to human health. Therefore, desulfurization treatment of these waste gases is mandatory in many countries and regions. To mitigate the harm of sulfur dioxide gas produced by coal-fired power generation to the natural environment, industry, and agriculture, thermal power plants are equipped with flue gas desulfurization systems. The mainstream method for flue gas desulfurization is wet desulfurization technology, which has advantages such as mature technology, high desulfurization efficiency, good adaptability to different coal types, and reliable operation.

[0003] For example, a desulfurization wastewater treatment device with Chinese announcement number CN222151030U is described in its specification as "related to the field of power plant wastewater treatment technology, specifically disclosing an environmentally friendly and energy-saving desulfurization wastewater treatment device, including a wastewater treatment tower, the upper part of which is a mixing tank, and the lower part of which is a filter tank; a wastewater inlet located on the top wall of the wastewater treatment tower; a mixing mechanism fixedly connected to the top wall of the wastewater treatment tower, the mixing mechanism being disposed inside the mixing tank; an aeration disc disposed in the middle of the bottom wall of the mixing tank; a drain pipe located on both sides of the bottom wall of the mixing tank, the mixing tank being connected to the filter tank through the drain pipe; a filtration mechanism disposed inside the filter tank; and a waste gas absorption tower connected to the wastewater treatment tower."

[0004] However, the existing devices have the following shortcomings during use:

[0005] Existing equipment uses a wastewater treatment tower to thoroughly stir and filter wastewater, improving wastewater treatment efficiency. The waste gas absorption tower recovers and reuses the ammonia gas generated during wastewater treatment, preventing large amounts of ammonia gas from being released into the air and causing pollution. However, desulfurization wastewater and neutralization liquid are directly discharged into the mixing tank through a single inlet, which can easily lead to uneven mixing and insufficient reaction, reducing the pollutant removal rate.

[0006] Therefore, we propose a deep treatment and reuse system for power plant wastewater to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a deep treatment and reuse system for power plant wastewater. A servo motor drives a bent pipe to rotate, causing a rotating drum to revolve around the center of a mixing tank. Simultaneously, the meshing of an internal gear and a first spur gear enables the rotating drum to rotate synchronously during its revolution, forming a composite motion trajectory. A fixed shaft and multiple dispersing rods inside the rotating drum move synchronously with it. Through centrifugal force and the coordination of the dispersing rods on the fixed shaft, the incoming liquid is evenly sprayed and diffused into the surrounding area of ​​the mixing tank through multiple through-holes on the outer surface of the rotating drum. This also disperses the liquid, ensuring uniform distribution of the desulfurization wastewater and neutralizing liquid from the initial contact stage, thus solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a power plant wastewater deep treatment and reuse system, comprising a base plate and a mixing tank disposed on top of the base plate, wherein an aeration disc is installed at the bottom of the mixing tank, an ammonia gas introduction, conversion and recovery mechanism is disposed on the top of the base plate, a uniform liquid distribution mechanism is disposed on the top of the base plate, and a PLC controller is installed on the outer surface of the mixing tank, wherein the wiring terminals of the PLC controller are connected to the device wiring.

[0009] The uniform liquid distribution mechanism includes a fixed frame fixedly connected to the top of the mixing tank. A liquid inlet pipe is installed on the top of the fixed frame. A bent pipe is rotatably connected to the top of the mixing tank. The bottom end of the liquid inlet pipe passes through the fixed frame and is rotatably connected to the top end of the bent pipe. A servo motor for driving the bent pipe to rotate is fixedly installed on the top inner side of the fixed frame. An internal gear is fixedly connected to the inner surface of the mixing tank. The bottom end of the bent pipe passes through the mixing tank and is rotatably connected to a rotating cylinder. A first spur gear that meshes with the internal gear is fixedly sleeved on the outer surface of the rotating cylinder. A fixed shaft is fixedly connected to the inner surface of the rotating cylinder. Multiple dispersing rods are fixedly connected to the outer surface of the fixed shaft. Multiple through holes are opened on the outer surface of the rotating cylinder.

[0010] Preferably, the mixing tank is provided with a high-efficiency mixing mechanism, which includes a first mixing shaft rotatably connected to the bottom of the mixing tank, and a plurality of first mixing plates are fixedly connected to the outer surface of the first mixing shaft.

[0011] Preferably, the inner surface of the mixing tank is provided with an annular groove, and a circular plate is slidably connected in the annular groove, and the circular plate is fixedly sleeved on the outer surface of the bent pipe.

[0012] Preferably, a second stirring shaft is rotatably connected to the bottom of the circular plate, a fourth spur gear that meshes with the internal gear is fixedly sleeved on the outer surface of the second stirring shaft, and a plurality of second stirring plates are fixedly connected to the outer surface of the second stirring shaft.

[0013] Preferably, the top of the base plate is provided with a filter anti-clogging mechanism, which includes a filter box installed on the top of the base plate, and the mixing box is installed on the top of the filter box.

[0014] Preferably, a first filter screen and a second filter screen are fixedly connected to the inner surface of the filter box, wherein the diameter of the filter holes of the first filter screen is smaller than the diameter of the filter holes of the second filter screen.

[0015] Preferably, a rotating shaft is rotatably connected to the inner top of the filter box, the bottom end of the rotating shaft movably passes through the second filter screen, and two mounting blocks are fixedly sleeved on the outer surface of the rotating shaft, with four cleaning brushes installed on both sides of the two mounting blocks.

[0016] Preferably, the outer surface of the filter box is hinged with two maintenance doors, the top of the filter box is fixedly connected to two connecting pipes, the top ends of the two connecting pipes are connected to the interior of the mixing tank, the bottom end of the filter box is fixedly connected to a recovery pipe, and solenoid valves are installed on both connecting pipes and the recovery pipe.

[0017] Preferably, the output end of the servo motor is fixedly connected to a second spur gear, and the outer surface of the bent tube is fixedly sleeved with a third spur gear that meshes with the second spur gear.

[0018] Preferably, a dual-shaft motor is fixedly installed at the bottom of the mixing tank. One output end of the dual-shaft motor movably passes through the mixing tank and is fixedly connected to the first mixing shaft. The other output end of the dual-shaft motor movably passes through the filter tank and is fixedly connected to the rotating shaft.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention utilizes a uniform liquid distribution mechanism. A servo motor drives a curved tube to rotate, causing a rotating cylinder to revolve around the center of the mixing tank. Simultaneously, the meshing transmission between the internal gear and the first spur gear enables the rotating cylinder to rotate synchronously during its revolution, forming a composite motion trajectory. The fixed shaft and multiple dispersing rods inside the rotating cylinder move synchronously with the rotating cylinder. Under the action of centrifugation and in conjunction with the dispersing rods on the fixed shaft, the incoming liquid is evenly sprayed and diffused into the surrounding area of ​​the mixing tank through multiple through holes on the outer surface of the rotating cylinder. This also disperses the liquid, ensuring that the desulfurization wastewater and neutralization liquid are evenly distributed in the initial contact stage. This improves the mixing uniformity of the two liquids, increases the pollutant removal rate, and solves the problem in existing devices where desulfurization wastewater and neutralization liquid are directly discharged into the mixing tank through a single inlet, which easily leads to uneven mixing, insufficient reaction, and reduced pollutant removal rate.

[0021] 2. This invention achieves dual optimization of reaction efficiency and equipment energy efficiency by setting up a high-efficiency stirring mechanism and a dual-shaft motor. On the one hand, the dual-shaft motor drives the first stirring shaft to drive the first stirring plate to perform main stirring of the liquid. On the other hand, through the rotation of the bent tube, the fourth spur gear meshes with the internal gear, so that the second stirring shaft drives the second stirring plate to perform auxiliary stirring, forming a dual stirring system, which accelerates the reaction rate. At the same time, the dual-shaft motor synchronously drives the rotating shaft of the filter anti-clogging mechanism to rotate, eliminating the need for an additional power source, simplifying the equipment structure, reducing energy consumption, and taking into account both stirring effect and energy saving requirements.

[0022] 3. This invention, by incorporating a filter anti-clogging mechanism and a dual-axis motor, ensures the stable operation of the filtration system and the quality of wastewater reuse. The first and second filter screens inside the filter box employ a graded filtration structure with different pore sizes, which can progressively trap impurities of different particle sizes, improving filtration accuracy. The dual-axis motor drives the rotating shaft to move the cleaning brush, enabling real-time cleaning of the two filter screens, effectively preventing clogging caused by impurities and ensuring stable filtration efficiency. Combined with the convenient opening and closing of the maintenance door and the reuse design of the recovery pipe, it not only reduces the difficulty of equipment maintenance but also realizes the resource utilization of wastewater, meeting the core requirements of environmental protection and energy conservation. Attached Figure Description

[0023] Figure 1 This is a perspective view of the main structure of a power plant wastewater deep treatment and reuse system according to the present invention;

[0024] Figure 2 This is a left-side perspective view of a power plant wastewater deep treatment and reuse system according to the present invention.

[0025] Figure 3 This is a three-dimensional view of the connecting pipe structure in a power plant wastewater deep treatment and reuse system according to the present invention;

[0026] Figure 4 This is a three-dimensional view of the structure of a maintenance door in a power plant wastewater deep treatment and reuse system according to the present invention;

[0027] Figure 5 This is a three-dimensional cross-sectional view of the mixing tank in a power plant wastewater deep treatment and reuse system according to the present invention.

[0028] Figure 6 This is a three-dimensional view of the aeration disc in a power plant wastewater deep treatment and reuse system according to the present invention.

[0029] Figure 7 This is a three-dimensional cross-sectional view of a filter box in a power plant wastewater deep treatment and reuse system according to the present invention.

[0030] Figure 8 for Figure 6 Enlarged 3D view of the structure at point A in the middle;

[0031] Figure 9 This is a three-dimensional cross-sectional view of the rotating cylinder in a power plant wastewater deep treatment and reuse system according to the present invention.

[0032] In the diagram: 1. Base plate; 2. Mixing tank; 3. Aeration disc; 4. Ammonia gas introduction, conversion, and recovery mechanism; 5. Uniform liquid distribution mechanism; 501. Fixing frame; 502. Liquid inlet pipe; 503. Bend; 504. Servo motor; 505. Internal gear; 506. Rotating cylinder; 507. First spur gear; 508. Fixed shaft; 509. Dispersing rod; 510. Second spur gear; 511. Third spur gear; 512. Through hole; 6. High-efficiency mixing mechanism; 601. First mixing shaft; 602. First stirring plate; 603. Annular groove; 604. Circular plate; 605. Second stirring shaft; 606. Fourth spur gear; 607. Second stirring plate; 7. Filter anti-clogging mechanism; 701. Filter box; 702. First filter screen; 703. Second filter screen; 704. Rotating shaft; 705. Mounting block; 706. Cleaning brush; 707. Maintenance door; 708. Connecting pipe; 709. Recycling pipe; 710. Solenoid valve; 8. PLC controller; 9. Dual-axis motor. Detailed Implementation

[0033] 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.

[0034] like Figure 1 - Figure 9 As shown, the present invention provides a technical solution: a power plant wastewater deep treatment and reuse system, including a base plate 1 and a mixing tank 2 set on the top of the base plate 1. An aeration disc 3 is installed at the bottom of the mixing tank 2. An ammonia gas introduction, conversion and recovery mechanism 4 is set on the top of the base plate 1. A uniform liquid distribution mechanism 5 is set on the top of the base plate 1. A PLC controller 8 is installed on the outer surface of the mixing tank 2. The wiring terminals of the PLC controller 8 are connected to the device wiring.

[0035] The uniform liquid distribution mechanism 5 includes a fixed frame 501 fixedly connected to the top of the mixing tank 2. A liquid inlet pipe 502 is mounted on the top of the fixed frame 501. A bent pipe 503 is rotatably connected to the top of the mixing tank 2. The bottom end of the liquid inlet pipe 502 passes through the fixed frame 501 and is rotatably connected to the top end of the bent pipe 503. A servo motor 504 for driving the bent pipe 503 to rotate is fixedly mounted on the inner top of the fixed frame 501. An internal gear 505 is fixedly connected to the inner surface of the mixing tank 2. The bottom end of the bent pipe 503 passes through the mixing tank 2 and is rotatably connected to a rotating cylinder 506. A coupling that meshes with the internal gear 505 is fixedly sleeved on the outer surface of the rotating cylinder 506. The first spur gear 507 is connected to the inner surface of the rotating cylinder 506, and a fixed shaft 508 is fixedly connected to the inner surface of the rotating cylinder 506. Multiple dispersing rods 509 are fixedly connected to the outer surface of the fixed shaft 508. Multiple through holes 512 are opened on the outer surface of the rotating cylinder 506. Through the uniform liquid distribution mechanism 5, the fixed frame 501 carries the servo motor 504 and the liquid inlet pipe 502. The servo motor 504 drives the bent pipe 503 to rotate, causing the rotating cylinder 506 to revolve around the center of the mixing tank 2. At the same time, the first spur gear 507 outside the rotating cylinder 506 meshes with the internal gear 505 inside the mixing tank 2, so that the rotating cylinder 506 can rotate synchronously, forming a compound motion track. The fixed shaft 508 and multiple dispersing rods 509 inside the rotating cylinder 506 move synchronously with the rotating cylinder 506. Under the action of centrifugation and in conjunction with the dispersing rods 509 on the fixed shaft 508, the incoming liquid is evenly sprayed and diffused into the surrounding area of ​​the mixing tank 2 through multiple through holes 512 on the outer surface of the rotating cylinder 506. This also disperses the liquid, ensuring that the desulfurization wastewater and neutralization liquid are evenly distributed in the initial contact stage. This improves the mixing uniformity of the two liquids, increases the pollutant removal rate, and solves the problem in existing devices where desulfurization wastewater and neutralization liquid are directly discharged into the tank through a single inlet, which easily leads to uneven mixing, incomplete reaction, and reduced efficiency. The issue of pollutant removal rate is addressed by using the aeration disc 3 at the bottom of the mixing tank 2 to efficiently decompose ammonia in the desulfurization wastewater. Combined with the ammonia inlet conversion and recovery mechanism 4 at the top of the bottom plate 1, the ammonia produced by decomposition can be collected in a timely manner and converted into ammonia water for recycling and reuse, avoiding direct emission of ammonia and causing air pollution. This achieves deep removal and resource utilization of ammonia (the aeration disc 3 and the ammonia inlet conversion and recovery mechanism 4 are existing technologies, and their working principles and specific structures will not be described in detail here). At the same time, the integrated layout reduces the investment in additional conveying equipment, lowers energy consumption and operating costs, and meets the industry development needs of environmental protection and energy conservation.

[0036] like Figure 1 and Figure 5As shown, a high-efficiency stirring mechanism 6 is installed inside the mixing tank 2. The high-efficiency stirring mechanism 6 includes a first stirring shaft 601 rotatably connected to the bottom of the mixing tank 2. Multiple first stirring plates 602 are fixedly connected to the outer surface of the first stirring shaft 601. The mixing tank 2 provides the core main stirring power. The first stirring shaft 601 drives the multiple first stirring plates 602 to rotate inside the mixing tank 2, which performs longitudinal deep stirring of the desulfurization wastewater and neutralization liquid in the mixing tank 2, breaks the laminar flow state of the liquid, promotes convection and contact between liquids, accelerates the acid-base neutralization and pollutant reaction rate, realizes the deep transformation and preliminary purification of pollutants, improves the overall reaction efficiency, and lays a good reaction foundation for subsequent wastewater treatment.

[0037] like Figure 1 and Figure 8 As shown, an annular groove 603 is provided on the inner surface of the mixing tank 2. A circular plate 604 is slidably connected in the annular groove 603, and the circular plate 604 is fixedly sleeved on the outer surface of the bent pipe 503. The annular groove 603 forms a precise circumferential limit and sliding support for the circular plate 604. After the circular plate 604 is fixedly sleeved with the bent pipe 503, it can effectively limit the radial sway of the bent pipe 503, avoid the bent pipe 503 from deviating or tilting during the revolution, and ensure the stability and coaxiality of the rotation of the bent pipe 503. At the same time, the sliding connection design of the circular plate 604 does not affect the normal revolution of the bent pipe 503, taking into account both structural limit and movement flexibility, and improving the operational reliability of the uniform liquid distribution mechanism 5.

[0038] like Figure 5 , Figure 6 and Figure 8 As shown, a second stirring shaft 605 is rotatably connected to the bottom of the circular plate 604. A fourth spur gear 606, which meshes with the internal gear 505, is fixedly sleeved on the outer surface of the second stirring shaft 605. Multiple second stirring plates 607 are fixedly connected to the outer surface of the second stirring shaft 605. Through the meshing of the fourth spur gear 606 with the internal gear 505, the second stirring shaft 605 rotates synchronously when the bent tube 503 revolves, thereby driving the second stirring plates 607 to rotate, forming a dual stirring system of "first stirring plate 602 as the main stirrer + second stirring plate 607 as the auxiliary stirrer". The second stirring plate 607 forms a transverse auxiliary stirring system, which can fill the stirring gap of the first stirring plate 602, and perform all-round, dead-angle-free stirring of the liquid in the mixing tank 2, realizing the deep transformation and decomposition of pollutants, further improving the mixing uniformity of wastewater and neutralizing liquid, avoiding insufficient local reaction, and effectively improving the pollutant removal rate.

[0039] like Figure 1 and Figure 7As shown, a filter anti-clogging mechanism 7 is provided on the top of the base plate 1. The filter anti-clogging mechanism 7 includes a filter box 701 installed on the top of the base plate 1 and a mixing box 2 installed on the top of the filter box 701. By directly installing the mixing box 2 on the top of the filter box 701, the wastewater reaction and filtration processes are integrated, simplifying the overall layout of the equipment and saving the installation space of the base plate 1. At the same time, it shortens the conveying path of the wastewater after mixing into the filter box 701, reduces pipeline connections, reduces the risk of leakage during wastewater transportation, and makes the overall disassembly and assembly of the equipment and pipeline maintenance more convenient.

[0040] like Figure 1 and Figure 7 As shown, a first filter screen 702 and a second filter screen 703 are fixedly connected to the inner surface of the filter box 701. The filter hole diameter of the first filter screen 702 is smaller than that of the second filter screen 703. By adopting a staged filtration mode, the second filter screen 703 first intercepts large-particle impurities in the wastewater, preventing large-particle impurities from directly clogging the smaller filter hole of the first filter screen 702, effectively extending the service life of the first filter screen 702. The first filter screen 702 then performs fine filtration on the coarsely filtered wastewater, intercepting fine suspended impurities. The dual filtration improves the filtration accuracy of the wastewater, making the treated wastewater of better quality, achieving deep purification of wastewater, and meeting the water quality requirements for power plant wastewater reuse.

[0041] like Figure 1 and Figure 7 As shown, a rotating shaft 704 is rotatably connected to the top of the filter box 701. The bottom end of the rotating shaft 704 passes through the second filter screen 703. Two mounting blocks 705 are fixedly sleeved on the outer surface of the rotating shaft 704. Four cleaning brushes 706 are installed on both sides of the two mounting blocks 705. The rotating shaft 704 drives the mounting blocks 705 and the cleaning brushes 706 to rotate synchronously. The cleaning brushes 706 can continuously contact the surfaces of the first filter screen 702 and the second filter screen 703 and make a circular motion, which can scrape off the impurities attached to the first filter screen 702 and the second filter screen 703 in real time, avoid the accumulation of impurities and cause filter screen blockage, ensure the stable filtration flow of the filter screen, and maintain the continuous and efficient operation of the filtration system. At the same time, the four cleaning brushes 706 correspond to the double sides of the two filter screens for cleaning, and the cleaning range is fully covered, further improving the anti-clogging effect.

[0042] like Figure 1 , Figure 3 and Figure 4As shown, the outer surface of the filter box 701 is hinged with two maintenance doors 707. The top of the filter box 701 is fixedly connected to two connecting pipes 708, the top ends of which are connected to the interior of the mixing tank 2. The bottom of the filter box 701 is fixedly connected to a recovery pipe 709. Solenoid valves 710 are installed on both connecting pipes 708 and the recovery pipe 709. The hinged maintenance doors 707 allow for easy opening and closing, facilitating regular opening of the filter box 701 by personnel to inspect, clean, and replace the filter screen, or remove accumulated impurities, thus reducing equipment maintenance difficulty. Maintenance costs; the two connecting pipes 708 enable dual-channel connection between the mixing tank 2 and the filter tank 701, allowing the mixed wastewater to enter the filter tank 701 evenly and avoiding excessive local load on the filter screen caused by single-channel liquid inlet; the solenoid valve 710 can automatically control the opening and closing of the connecting pipes 708 and the recovery pipe 709 through the PLC controller 8, realizing automated operation of wastewater transportation and reuse, reducing manual intervention; the recovery pipe 709 can directly export the filtered and qualified wastewater, realizing the resource recovery and reuse of wastewater, which meets the design requirements of environmental protection and energy conservation.

[0043] like Figure 1 and Figure 8 As shown, the output end of the servo motor 504 is fixedly connected to a second spur gear 510, and the outer surface of the bent tube 503 is fixedly sleeved with a third spur gear 511 that meshes with the second spur gear 510. By using a gear meshing transmission method to drive the bent tube 503 to rotate, the transmission ratio is precise and the torque transmission is stable, which can ensure that the power of the servo motor 504 is efficiently and smoothly transmitted to the bent tube 503, so that the bent tube 503 maintains a uniform speed revolution and avoids the situation of sudden speed changes during the liquid distribution process. At the same time, the transmission structure of the second spur gear 510 and the third spur gear 511 has high reliability and long service life, and can adapt to the working conditions of long-term continuous operation of the equipment, ensuring the operational stability of the uniform liquid distribution mechanism 5.

[0044] like Figure 3 , Figure 5 and Figure 7 As shown, a dual-shaft motor 9 is fixedly installed at the bottom of the mixing tank 2. One output end of the dual-shaft motor 9 movably passes through the mixing tank 2 and is fixedly connected to the first stirring shaft 601. The other output end of the dual-shaft motor 9 movably passes through the filter box 701 and is fixedly connected to the rotating shaft 704. The dual-shaft motor 9 serves as a single power source, simultaneously providing power to the main stirring mechanism (first stirring shaft 601) of the mixing tank 2 and the anti-clogging mechanism (rotating shaft 704) of the filter box 701. There is no need to configure separate power motors for the two mechanisms, which simplifies the power system structure of the equipment, reduces the number of motors and electrical control components, and reduces the manufacturing cost and operating energy consumption of the equipment. At the same time, the integrated power drive design reduces the setting of transmission components, reduces the failure points of the equipment, and improves the overall operational reliability and power utilization efficiency of the equipment.

[0045] The usage and working principle of this device are as follows: During the uniform liquid distribution stage, the servo motor 504 is turned on by the PLC controller 8, and the desulfurization wastewater and neutralization liquid are introduced into the bend 503 through the inlet pipe 502 in a certain proportion. The servo motor 504 drives the bend 503 to revolve around the center of the mixing tank 2 through the meshing of the second spur gear 510 and the third spur gear 511. The rotating cylinder 506 at the bottom of the bend 503 rotates on its own axis while revolving due to the meshing of the first spur gear 507 and the internal gear 505. After the desulfurization wastewater and neutralization liquid enter the bend 503 and the rotating cylinder 506 through the inlet pipe 502, under the action of centrifugal force, they are pre-dispersed by the dispersing rod 509 on the fixed shaft 508 and sprayed evenly into the entire area of ​​the mixing tank 2 through the through hole 512 on the outer surface of the rotating cylinder 506, so as to achieve deep pre-mixing of the two media in the initial contact stage.

[0046] In the deep mixing and aeration ammonia removal stage, after the liquid distribution is completed, the PLC controller 8 starts the dual-shaft motor 9 and the aeration disc 3. The dual-shaft motor 9 drives the first mixing shaft 601 to drive the first mixing plate 602 for main mixing. At the same time, the bent pipe 503 revolves and drives the circular plate 604 to move synchronously. The second mixing shaft 605 rotates through the meshing of the fourth spur gear 606 and the internal gear 505, driving the second mixing plate 607 to assist in mixing, forming a dual mixing system to accelerate acid-base neutralization and pollutant reaction. At the same time, the aeration disc 3 at the bottom of the mixing tank 2 aerates synchronously, decomposing ammonia in the wastewater. The ammonia is collected and converted into ammonia water for recovery through the ammonia introduction conversion and recovery mechanism 4 to avoid air pollution.

[0047] In the stage of graded filtration, after the reaction reaches the set time, the PLC controller 8 opens the solenoid valve 710 on the connecting pipe 708, and the reaction liquid in the mixing tank 2 flows into the filter box 701 through the dual channels. The second filter screen 703 intercepts large-particle impurities, and the first filter screen 702 filters fine suspended solids, improving the quality of the effluent. The dual-axis motor 9 synchronously drives the rotating shaft 704 to rotate, which drives the cleaning brush 706 on the mounting block 705 to clean the two filter screens in real time, avoiding the accumulation and clogging of impurities and ensuring stable filtration throughput.

[0048] During the wastewater reuse stage, the solenoid valve 710 on the recovery pipe 709 is opened by the PLC controller 8, and the reacted liquid is discharged and recovered through the recovery pipe 709 to realize the resource utilization of desulfurization wastewater; the waste residue intercepted during the filtration process is temporarily stored in the filter box 701 and will be cleaned up after the system is shut down.

[0049] During the shutdown and equipment maintenance phase, after the wastewater treatment is completed, the aeration disc 3, servo motor 504, and dual-axis motor 9 are shut down sequentially via PLC controller 8. Then, the solenoid valves 710 on the connecting pipe 708 and the recovery pipe 709 are closed to stop the operation of the ammonia introduction conversion and recovery mechanism 4. The maintenance door 707 on the outer surface of the filter box 701 is opened to clean and recover the waste residue trapped inside the filter box 701.

[0050] The wiring diagrams of the servo motor 504, solenoid valve 710, PLC controller 8 and dual-axis motor 9 in this invention are common knowledge in the field. Their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control methods and wiring layouts of the servo motor 504, solenoid valve 710, PLC controller 8 and dual-axis motor 9 will not be explained in detail.

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep treatment and reuse system for power plant wastewater, comprising a base plate (1) and a mixing tank (2) disposed on top of the base plate (1), wherein an aeration disc (3) is installed at the bottom of the mixing tank (2), and an ammonia gas introduction, conversion and recovery mechanism (4) is disposed on top of the base plate (1), characterized in that: The top of the base plate (1) is provided with a uniform liquid distribution mechanism (5), and the outer surface of the mixing tank (2) is equipped with a PLC controller (8). The wiring terminals of the PLC controller (8) are connected to the device wiring. The uniform liquid distribution mechanism (5) includes a fixed frame (501) fixedly connected to the top of the mixing tank (2). A liquid inlet pipe (502) is installed on the top of the fixed frame (501). A bent pipe (503) is rotatably connected to the top of the mixing tank (2). The bottom end of the liquid inlet pipe (502) passes through the fixed frame (501) and is rotatably connected to the top end of the bent pipe (503). A servo motor (504) for driving the bent pipe (503) to rotate is fixedly installed on the top inner side of the fixed frame (501). The inner side of the mixing tank (2)... An internal gear (505) is fixedly connected to the surface of the tube (503). The bottom end of the bent tube (503) passes through the mixing tank (2) and is rotatably connected to a rotating cylinder (506). A first spur gear (507) that meshes with the internal gear (505) is fixedly sleeved on the outer surface of the rotating cylinder (506). A fixed shaft (508) is fixedly connected to the inner surface of the rotating cylinder (506). Multiple dispersing rods (509) are fixedly connected to the outer surface of the fixed shaft (508). Multiple through holes (512) are opened on the outer surface of the rotating cylinder (506).

2. The power plant wastewater deep treatment and reuse system according to claim 1, characterized in that: The mixing tank (2) is equipped with a high-efficiency mixing mechanism (6), which includes a first mixing shaft (601) rotatably connected to the bottom of the mixing tank (2), and a plurality of first mixing plates (602) are fixedly connected to the outer surface of the first mixing shaft (601).

3. The power plant wastewater deep treatment and reuse system according to claim 2, characterized in that: The inner surface of the mixing tank (2) is provided with an annular groove (603), and a circular plate (604) is slidably connected in the annular groove (603), and the circular plate (604) is fixedly sleeved on the outer surface of the bent pipe (503).

4. The power plant wastewater deep treatment and reuse system according to claim 3, characterized in that: The bottom of the circular plate (604) is rotatably connected to a second stirring shaft (605), and a fourth spur gear (606) that meshes with an internal gear (505) is fixedly sleeved on the outer surface of the second stirring shaft (605). A plurality of second stirring plates (607) are fixedly connected to the outer surface of the second stirring shaft (605).

5. The power plant wastewater deep treatment and reuse system according to claim 1, characterized in that: The bottom plate (1) is provided with a filter anti-clogging mechanism (7) at the top. The filter anti-clogging mechanism (7) includes a filter box (701) installed on the top of the bottom plate (1), and the mixing box (2) is installed on the top of the filter box (701).

6. The power plant wastewater deep treatment and reuse system according to claim 5, characterized in that: The inner surface of the filter box (701) is fixedly connected with a first filter screen (702) and a second filter screen (703), wherein the filter hole diameter of the first filter screen (702) is smaller than the filter hole diameter of the second filter screen (703).

7. The power plant wastewater deep treatment and reuse system according to claim 6, characterized in that: The inner top of the filter box (701) is rotatably connected to a rotating shaft (704), the bottom end of the rotating shaft (704) is movably inserted through the second filter screen (703), and two mounting blocks (705) are fixedly sleeved on the outer surface of the rotating shaft (704). Four cleaning brushes (706) are installed on both sides of the two mounting blocks (705).

8. The power plant wastewater deep treatment and reuse system according to claim 7, characterized in that: The outer surface of the filter box (701) is hinged with two maintenance doors (707). The top of the filter box (701) is fixedly connected to two connecting pipes (708). The top ends of the two connecting pipes (708) are connected to the interior of the mixing tank (2). The bottom end of the filter box (701) is fixedly connected to a recovery pipe (709). Solenoid valves (710) are installed on both the two connecting pipes (708) and the recovery pipe (709).

9. The power plant wastewater deep treatment and reuse system according to claim 1, characterized in that: The output end of the servo motor (504) is fixedly connected to a second spur gear (510), and the outer surface of the bent tube (503) is fixedly sleeved with a third spur gear (511) that meshes with the second spur gear (510).

10. A power plant wastewater deep treatment and reuse system according to claim 1, characterized in that: A dual-shaft motor (9) is fixedly installed at the bottom of the mixing tank (2). One of the output ends of the dual-shaft motor (9) passes through the mixing tank (2) and is fixedly connected to the first stirring shaft (601). The other output end of the dual-shaft motor (9) passes through the filter box (701) and is fixedly connected to the rotating shaft (704).

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