A waste water treatment device for a thermal power plant

Abstract

The application provides a waste water treatment device for thermal power plants, and relates to the technical field of waste water treatment, which comprises a liquid storage pool, a reaction pool and a separation pool, a filter screen and a slag removing mechanism for cleaning the filter screen are arranged in the separation pool, the slag removing mechanism comprises a lifting assembly for lifting the filter screen upward and a sliding assembly for driving the lifting assembly to move along the length direction of the separation pool; one end of the filter screen is provided with a vertical plate which is arranged vertically on the bottom wall of the separation pool, the other end of the filter screen is provided with a winding piece, the winding piece comprises a connecting rod arranged on the side wall of the separation pool and a spring coil installed on the connecting rod; the lifting assembly comprises a mounting seat, a magnetic seat and a magnetic column, the magnetic seat is slidably arranged on the mounting seat and located at the upper part of the filter screen, the magnetic column is attracted to the magnetic seat and located at the lower part of the filter screen, and the mounting seat is provided with a lifting piece for driving the magnetic seat to move. The application can conveniently complete the cleaning process of the precipitated waste slag, the cleaning effect is improved, and the cleaning period is shortened.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a wastewater treatment device for thermal power plants. Background Technology

[0002] Wastewater treatment from thermal power plants is a crucial aspect of environmental protection. Its main components include ash-flushing wastewater from slag washing and dust collector cleaning, desulfurization wastewater from flue gas desulfurization, and industrial wastewater from boiler shutdown protection and chemical cleaning. Currently, the primary method for treating thermal power plant wastewater is the chemical slag method. This involves adding a precipitant to the wastewater to separate and precipitate it, followed by separate batch treatment of the precipitate and wastewater.

[0003] After adding a precipitant to the wastewater in the reaction tank and stirring to ensure a thorough reaction, the wastewater is introduced into a separation tank for separation treatment. The separation tank is equipped with a filter screen, and the effluent pipe is located below the filter screen. First, the floating foam on the water surface is skimmed off. Then, the effluent pipe is opened to allow the reacted water to flow out, and the settled waste residue is trapped on the filter screen. When cleaning the filter screen, the water must be completely drained and the filter screen removed. The cleaning process also requires rinsing with water. Currently, although there are methods that use cleaning scrapers to clean the filter screen in water, the cleaning effect is not ideal due to the mesh structure of the filter screen. Furthermore, as the settled waste residue accumulates, it easily passes over the cleaning scraper and remains on the filter screen during subsequent cleaning, requiring repeated cleaning and resulting in a long cleaning cycle. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater treatment device for thermal power plants, which can conveniently complete the cleaning process of sedimentary waste residue trapped on the filter screen, improve the cleaning effect and shorten the cleaning cycle.

[0005] This invention is achieved through the following technical solution: a wastewater treatment device for thermal power plants, comprising:

[0006] A liquid storage tank, wherein a liquid inlet trough is provided on one side of the top of the liquid storage tank, and a grid plate is provided on the liquid inlet trough;

[0007] The reaction tank is located on the side of the liquid storage tank away from the liquid inlet tank and is separated from the liquid storage tank by a baffle. Multiple baffles are distributed in the reaction tank, which divides the reaction tank into multiple reaction chambers. Each reaction chamber is equipped with a stirring shaft. The baffle is provided with through grooves that are connected to the multiple reaction chambers and sealing members for closing the through grooves.

[0008] A separation tank is located at the end of the reaction tank away from the storage tank. Multiple water pumps for pumping out wastewater from the reaction chamber are configured outside the separation tank. A filter screen is installed along the length of the separation tank near the bottom wall. The drain pipe of the separation tank is located below one end of the filter screen.

[0009] The slag removal mechanism includes a lifting assembly for lifting the filter screen upwards and a sliding assembly for driving the lifting assembly to move along the length of the separation tank.

[0010] The filter screen has a vertical plate at one end, which is vertically mounted on the bottom wall of the separation tank. The filter screen has a winding component at the other end, which includes a connecting rod mounted on the side wall of the separation tank and a coil spring plate mounted on the connecting rod.

[0011] The lifting assembly includes a mounting base, the bottom of which is provided with a magnetic seat and a magnetic column. The magnetic seat is slidably mounted on the mounting base and located above the filter screen. The magnetic column is attracted to the magnetic seat and located below the filter screen. The mounting base is provided with a lifting component for driving the magnetic seat to move up and down.

[0012] Furthermore, the lifting component includes a dual-axis motor, which is fixedly mounted in the middle section of the mounting base. Both output shafts of the dual-axis motor are equipped with drive gears. A lifting rack that meshes with the drive gears is slidably mounted on the mounting base in the vertical direction. The bottom end of the lifting rack is fixedly connected to a magnetic base via a lifting rod.

[0013] Furthermore, a foam scraping component is provided on the separation tank and above the slag removal mechanism. The foam scraping component includes a scraping seat and a scraper. The scraping seat is slidably disposed between the two side walls of the separation tank along the length direction of the separation tank, and the scraper is rotatably disposed on the scraping seat through a connecting piece.

[0014] Furthermore, a pressing member is provided on one side of the lifting member for driving the connecting piece to flip. When the connecting piece flips, the scraper moves above the water surface. The pressing member includes a pressing rack, which is slidably disposed on the side of the driving gear away from the lifting rack and meshes with the driving gear. A pressing rod is provided at the top of the pressing rack, and a pressing block is provided at the top of the pressing rod for abutting against the connecting piece.

[0015] Furthermore, a drive column is provided at the bottom of the pressure block, and a strip groove is provided on the connecting piece for the drive column to be inserted and slid. When the scraper moves to inside or outside the water surface, the drive column is located in the strip groove.

[0016] Furthermore, the scraping seat is provided with a mounting groove for the connecting piece to rotate, and the end of the connecting piece away from the pressing block extends out of the mounting groove and is connected to the scraping seat by an elastic rope.

[0017] Furthermore, the sliding assembly includes a sliding motor, a lead screw, a guide rod, a first slider, and a second slider. The first slider and the second slider are respectively fixed at both ends of the mounting base. The lead screw is rotatably disposed between the two end walls of the separation tank. The sliding motor is disposed outside the separation tank, and the output shaft of the sliding motor is fixedly connected to the lead screw. The guide rod is fixedly connected between the two end walls of the separation tank. The first slider has a threaded hole and is threadedly connected to the lead screw. The second slider has a through hole and is slidably connected to the guide rod.

[0018] Furthermore, a slag discharge channel is formed between the vertical plate and the end wall of the separation tank. A horizontal spiral conveyor is installed in the slag discharge channel. A slag discharge cylinder is vertically installed outside the slag discharge channel. A vertical spiral conveyor is installed inside the slag discharge cylinder. The bottom end of the slag discharge cylinder is connected to the slag discharge channel through a slag inlet. A slag outlet is provided on one side of the top of the slag discharge cylinder.

[0019] Furthermore, an extension chamber is provided on the outer side of the separation tank, and an opening and closing component is provided between the extension chamber and the end wall of the separation tank. The opening and closing component is located above the slag discharge channel, and includes an opening and closing plate and an opening and closing electric cylinder for driving the opening and closing plate to rise and fall.

[0020] Furthermore, the closure includes a gate and a lifting electric cylinder. The gate is slidably mounted on the baffle and can close the through slot. A lifting rod is provided on the gate. The lifting electric cylinder is located on one side of the baffle and the piston rod of the lifting electric cylinder is fixedly connected to the lifting rod.

[0021] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0022] 1. This invention features a slag-removing mechanism composed of a lifting component and a sliding component. A vertical plate is installed at one end of the filter screen to form a slag discharge channel. Magnetic seats and magnetic columns are located on the upper and lower sides of the filter screen, respectively, clamping the filter screen between them. When the magnetic seat is raised by the lifting component, the magnetic column can lift the clamped part of the filter screen upward under the adsorption of the magnetic seat. Then, the lifting component is moved by the sliding component, which allows the sedimented waste residue on the filter screen to move towards the slag discharge channel. This facilitates the cleaning process of the sedimented waste residue trapped on the filter screen, improves the cleaning effect, and shortens the cleaning cycle.

[0023] 2. The present invention provides a foam scraping component at the upper part of the slag removal mechanism. A pressing component on one side of the lifting component drives the scraper to flip upward and move it above the water surface. A drive column is configured on the pressing component to facilitate the simultaneous cleaning of the sedimented waste on the filter screen and the foam suspended on the water surface.

[0024] 3. This invention sets up a horizontal spiral conveyor in the slag discharge channel, and sets up a vertical slag discharge cylinder outside the slag discharge channel and sets up a vertical spiral conveyor inside the slag discharge cylinder. The horizontal spiral conveyor transports the sedimented waste to the slag inlet into the slag discharge cylinder, and the vertical spiral conveyor then transports the sedimented waste upward, which facilitates the discharge process of the sedimented waste and eliminates the need for staff to retrieve the sedimented waste in the separation tank. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the storage tank and reaction tank of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the filter screen, slag removal mechanism and foam scraper of the present invention in the separation tank;

[0028] Figure 4 This is a schematic diagram of the structure of the filter screen, slag removal mechanism, and foam scraping component of the present invention;

[0029] Figure 5 for Figure 4 Enlarged view of part A;

[0030] Figure 6 This is a schematic diagram of the slag removal mechanism and the foam scraping component of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the pressing component, connecting piece, and scraper when the scraper of the present invention moves above the water surface;

[0032] Figure 8 This is a schematic diagram of the structure of the pressing component, connecting piece, and scraper when the scraper of the present invention moves below the water surface;

[0033] Reference numerals: 1-Storage tank, 11-Inlet tank, 12-Grid plate, 2-Reaction tank, 21-Baffle, 22-Partition, 23-Reaction chamber, 24-Stirring shaft, 25-Sealing component, 251-Gate, 252-Lifting electric cylinder, 253-Lifting rod, 3-Separation tank, 31-Water pump, 32-Drain pipe, 33-Slag discharge channel, 34-Horizontal screw conveyor, 35-Extension chamber, 36-Opening and closing component, 361-Opening and closing plate, 362-Opening and closing electric cylinder, 4-Filter screen, 41-Vertical plate, 42-Rewinding component, 421-Connecting rod, 422-Spring, 5-Slag removal mechanism, 51-Lifting assembly, 511-Mounting base, 512-Magnetic base 513-Magnetic column, 52-Sliding assembly, 521-Sliding motor, 522-Screw, 523-Guide rod, 524-First slider, 525-Second slider, 53-Lifting component, 531-Dual-axis motor, 532-Drive gear, 533-Lifting rack, 534-Lifting rod, 54-Pressing component, 541-Pressing rack, 542-Pressing rod, 543-Pressure block, 544-Drive column, 6-Foam scraper, 61-Scraper seat, 611-Mounting groove, 62-Scraper, 63-Connecting piece, 631-Strip groove, 632-Elastic rope, 7-Slag discharge cylinder, 71-Vertical screw conveyor, 72-Slag inlet, 73-Slag outlet. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] Example

[0037] The following is for reference Figures 1-8 As shown in the illustration, and further explained with reference to specific embodiments, this embodiment provides a wastewater treatment device for thermal power plants. Figure 1As shown, the system includes a storage tank 1, a reaction tank 2, and a separation tank 3. An inlet trough 11 is located on one side of the top of the storage tank 1, and a grid plate 12 is installed on the inlet trough 11. Wastewater enters the storage tank 1 from the inlet trough 11. The grid plate 12 can trap large particulate impurities in the wastewater. The reaction tank 2 is located on the side of the storage tank 1 away from the inlet trough 11 and is separated from the storage tank 1 by a baffle 21. Multiple baffles 22 are distributed within the reaction tank 2, dividing it into multiple reaction chambers 23. Each reaction chamber 23 is equipped with a stirring shaft 24. After adding a precipitant to the reaction chamber 23, the stirring shaft 24 is driven by a stirring motor to stir the wastewater and precipitant to ensure a more complete reaction. The baffle 21 is provided with through channels corresponding to and connected to the multiple reaction chambers 23, and sealing elements 25 for closing the through channels. By setting up multiple reaction chambers 23 and arranging multiple sets of sealing components 25 respectively, the corresponding reaction chamber 23 can be connected to the storage tank 1 by opening the sealing components 25 to realize the water inlet process. At this time, the remaining reaction chambers 23 can respectively carry out the processes of adding precipitant, stirring and draining. The multiple reaction chambers 23 do not interfere with each other and can carry out different processing processes.

[0038] Reference Figure 1 , Figure 2 As shown, the sealing component 25 includes a gate 251 and a lifting cylinder 252. The gate 251 is slidably mounted on the baffle 21 and can close the through slot. A lifting rod 253 is provided on the gate 251. The lifting cylinder 252 is located on one side of the baffle 21, and the piston rod of the lifting cylinder 252 is fixedly connected to the lifting rod 253. Activating the lifting cylinder 252 and moving its piston rod outwards causes the gate 251 to move upwards via the lifting rod 253, opening the through slot. This allows the storage tank 1 to communicate with the corresponding reaction chamber 23 and introduce the stored water into the reaction chamber 23. Once the reaction chamber 23 is filled with wastewater, a precipitant is added, and stirring is performed.

[0039] Reference Figure 1 , Figure 3As shown, the separation tank 3 is located at the end of the reaction tank 2 away from the storage tank 1. Multiple water pumps 31 are configured outside the separation tank 3 to extract wastewater from the reaction chamber 23. After stirring, the wastewater in the reaction chamber 23 can be pumped into the separation tank 3 by activating the corresponding water pump 31 for solid-liquid separation. A filter screen 4 for trapping sedimentary waste is installed along its length near the bottom wall of the separation tank 3. The drain pipe 32 of the separation tank 3 is located below one end of the filter screen 4. Because the drain pipe 32 is located below the filter screen 4, the sedimentary waste is trapped by the filter screen 4 and will not be discharged with the treated wastewater. The separation tank 3 is also equipped with a slag-removing mechanism 5 for cleaning the sedimentary waste trapped on the filter screen 4. The slag-removing mechanism 5 includes a lifting component 51 for lifting the filter screen 4 upwards and a sliding component 52 for driving the lifting component 51 to move along the length of the separation tank 3. In this embodiment, the filter screen 4 is made of stainless steel, which has high strength and good toughness, and is not easy to rust even after long-term use in water.

[0040] Reference Figure 3 , Figure 4 As shown, a vertical plate 41 is provided at one end of the filter screen 4. The vertical plate 41 is vertically mounted on the bottom wall of the separation tank 3, and a slag discharge channel 33 is formed between the vertical plate 41 and the end wall of the separation tank 3. A winding member 42 is provided at the other end of the filter screen 4. (Refer to...) Figure 5 As shown, the winding component 42 includes a connecting rod 421 disposed on the side wall of the separation tank 3 and a coil spring 422 mounted on the connecting rod 421. In the initial state, the filter screen 4 is in a straight state under the action of the coil spring 422. The filter screen 4 is lifted upward by the lifting component 51, which makes the lifted part of the filter screen 4 bulge upward, and the sedimented waste residue can move towards the slag discharge channel 33. When the sliding component 52 drives the lifting component 51 to move to a position close to the vertical plate 41, the sedimented waste residue can fall into the slag discharge channel 33.

[0041] Reference Figure 1As shown, a horizontal spiral conveyor 34 is installed inside the slag discharge channel 33. A slag discharge cylinder 7 is vertically installed outside the slag discharge channel 33, and a vertical spiral conveyor 71 is installed inside the slag discharge cylinder 7. Both the horizontal spiral conveyor 34 and the vertical spiral conveyor 71 include a drive motor and spiral conveying blades (the drive motor and spiral conveying blades are existing technology, so the specific structure of the vertical spiral conveyor 71 inside the slag discharge cylinder 7 is not shown in the figure). The bottom end of the slag discharge cylinder 7 is connected to the slag discharge channel 33 through the slag inlet 72, and the top side of the slag discharge cylinder 7 has a slag outlet 73. The horizontal spiral conveyor 34 conveys the settled waste slag to the slag inlet 72 into the slag discharge cylinder 7, and the vertical spiral conveyor 71 then conveys the settled waste slag upwards, finally discharging it from the slag outlet 73. It should be noted that the spiral conveying blades of the vertical spiral conveyor 71 are provided with filter holes, which can reduce the water content in the discharged settled waste slag.

[0042] Reference Figure 4 , Figure 6 As shown, the lifting assembly 51 includes a mounting base 511. A magnetic seat 512 and a magnetic column 513 are disposed at the bottom of the mounting base 511. The magnetic seat 512 is slidably disposed on the mounting base 511 and located above the filter screen 4. The magnetic column 513 is attracted to the magnetic seat 512 and located below the filter screen 4. A lifting component 53 is provided on the mounting base 511 to drive the magnetic seat 512 to move up and down. The magnetic seat 512 and the magnetic column 513 are located on the upper and lower sides of the filter screen 4 respectively, clamping the filter screen 4 between them. When the lifting component 53 drives the magnetic seat 512 to rise, the magnetic column 513 can lift the clamped portion of the filter screen 4 upwards under the adsorption of the magnetic seat 512. Then, the sliding assembly 52 drives the lifting assembly 51 to move, allowing the sedimented waste residue on the filter screen 4 to move towards the slag discharge channel 33.

[0043] Reference Figure 4As shown, the sliding assembly 52 includes a sliding motor 521, a lead screw 522, a guide rod 523, a first slider 524, and a second slider 525. The first slider 524 and the second slider 525 are respectively fixed at both ends of the mounting base 511. The lead screw 522 is rotatably disposed between the two end walls of the separation tank 3. The sliding motor 521 is disposed outside the separation tank 3, and the output shaft of the sliding motor 521 is fixedly connected to the lead screw 522. The guide rod 523 is fixedly connected between the two end walls of the separation tank 3. The first slider 524 has a threaded hole and is threadedly connected to the lead screw 522. The second slider 525 has a through hole and is slidably connected to the guide rod 523. When the sliding motor 521 is started, the lead screw 522 is driven to rotate. During the rotation of the lead screw 522, the first slider 524 will move along the length of the lead screw. The guide rod 523 guides the second slider 525, thereby causing the mounting base 511 to move along the length of the separation tank 3, so as to drive the lifting assembly 51 to move closer to the slag discharge channel 33, thereby facilitating the discharge of sedimented waste into the slag discharge channel 33.

[0044] Reference Figure 6 , Figure 7 As shown, a foam scraper 6 is provided on the separation tank 3 and above the scum removal mechanism 5. The foam scraper 6 includes a scraper seat 61 and a scraper 62. The scraper seat 61 is slidably disposed between the two side walls of the separation tank 3 along the length of the separation tank 3. A connecting piece 63 is provided at the bottom end of the scraper 62. An installation groove 611 for the connecting piece 63 to rotate is provided on the scraper seat 61. The end of the connecting piece 63 away from the pressure block 543 extends out of the installation groove 611 and is connected to the scraper seat 61 by an elastic rope 632. When no external force is applied, the connecting piece 63 drives the scraper 62 to be below the water surface under the gravity of the scraper 62 and the tension of the elastic rope 632. When the end of the connecting piece 63 away from the scraper 62 is subjected to downward pressure, it can drive the scraper 62 to flip upward and move above the water surface. An extension chamber 35 is provided on the outer side of the separation tank 3. An opening and closing component 36 is provided between the extension chamber 35 and the end wall of the separation tank 3. The opening and closing component 36 is located above the slag discharge channel 33. The opening and closing component 36 includes an opening and closing plate 361 and an opening and closing electric cylinder 362 for driving the opening and closing plate 361 to rise and fall.

[0045] By pressing down the end of the connecting piece 63 away from the scraper 62, the top of the scraper 62 is rotated upward to above the water surface. Then, the scraper seat 61 is driven to move closer to the extension chamber 35, and the opening and closing plate 361 is driven down by the opening and closing electric cylinder 362 so that the accumulated foam can flow out into the extension chamber 35. When the scraper seat 61 is driven to move away from the extension chamber 35, the top of the scraper 62 is rotated downward to below the water surface so that the scraper 62 will not scrape the foam floating on the water surface away from the extension chamber 35 during the process of moving back to the initial position.

[0046] Reference Figure 6 , Figure 7 As shown, the lifting component 53 includes a dual-axis motor 531, which is fixedly mounted in the middle section of the mounting base 511. Both output shafts of the dual-axis motor 531 are equipped with drive gears 532. A lifting rack 533, which meshes with the drive gears 532, is slidably mounted on the mounting base 511 in the vertical direction. The bottom end of the lifting rack 533 is fixedly connected to the magnetic base 512 via a lifting rod 534. A pressing component 54 for driving the connecting piece 63 to flip is provided on one side of the lifting component 53. When the connecting piece 63 flips, the scraper 62 moves above the water surface. The pressing component 54 includes a pressing rack 541, which is slidably mounted on the side of the drive gear 532 away from the lifting rack 533 and meshes with the drive gear 532. A pressing rod 542 is provided at the top of the pressing rack 541, and a pressing block 543 for abutting against the connecting piece 63 is provided at the top of the pressing rod 542. When it is necessary to discharge the impurities on the filter screen 4 into the slag discharge channel 33, the dual-shaft motor 531 is started to drive the drive gear 532 to rotate. The drive gear 532 can drive the lifting rack 533 to move upward, so that the lifting rod 534 pulls the magnetic seat 512 upward. Under the action of magnetic force, the magnetic column 513 drives the part of the filter screen 4 that is clamped to move upward synchronously. At the same time, the pressing rack 541 moves downward, so that the pressing rod 542 drives the pressing block 543 to move downward synchronously. During the downward movement of the pressing block 543, it can press one end of the connecting piece 63, so that the other end of the connecting piece 63 is lifted upward and moved out above the water surface.

[0047] Reference Figure 7 As shown, a drive column 544 is provided at the bottom of the pressure block 543, and a strip groove 631 is provided on the connecting piece 63 for the drive column 544 to be inserted and slid. When the scraper 62 moves inside or outside the water surface, the drive column 544 is always located in the strip groove 631. By inserting the drive column 544 into the strip groove 631, when the sliding component 52 drives the lifting component 51 to move, the drive column 544 can drive the connecting piece 63 to move, thereby moving the entire foam scraper 6, thus eliminating the need for an additional drive source to drive the foam scraper 6 to move. By keeping the drive column 544 always in the strip groove 631, when the scraper 62 flips, the drive column 544 can still limit the connecting piece 63. Therefore, during the process of moving back to the initial position after one foam removal, the foam scraper 6 will not separate from the drive column 544, thus facilitating the next foam removal operation.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wastewater treatment device for thermal power plants, characterized in that, include: A liquid storage tank (1) is provided with an inlet trough (11) on one side of the top of the liquid storage tank (1), and a grid plate (12) is provided on the inlet trough (11); The reaction tank (2) is located on the side of the storage tank (1) away from the inlet tank (11) and is separated from the storage tank (1) by a baffle (21). Multiple baffles (22) are distributed in the reaction tank (2), and the multiple baffles (22) divide the reaction tank (2) into multiple reaction chambers (23). Each reaction chamber (23) is provided with a stirring shaft (24). The baffle (21) is provided with a through groove corresponding to the multiple reaction chambers (23) and a sealing member (25) for closing the through groove. Separation tank (3), the separation tank (3) is located at one end of the reaction tank (2) away from the storage tank (1), the separation tank (3) is equipped with multiple water pumps (31) for pumping out wastewater in the reaction chamber (23), the separation tank (3) is provided with a filter screen (4) along its own length near the bottom wall, and the drain pipe (32) of the separation tank (3) is located below one end of the filter screen (4); The slag removal mechanism (5) includes a lifting assembly (51) for lifting the filter screen (4) upward and a sliding assembly (52) for driving the lifting assembly (51) to move along the length of the separation tank (3). The filter screen (4) has a vertical plate (41) at one end, which is vertically mounted on the bottom wall of the separation tank (3). The filter screen (4) has a winding member (42) at the other end, which includes a connecting rod (421) mounted on the side wall of the separation tank (3) and a coil spring (422) mounted on the connecting rod (421). The lifting assembly (51) includes a mounting base (511), and a magnetic seat (512) and a magnetic column (513) are provided at the bottom of the mounting base (511). The magnetic seat (512) is slidably disposed on the mounting base (511) and located at the upper part of the filter screen (4). The magnetic column (513) is attracted to the magnetic seat (512) and located at the lower part of the filter screen (4). The mounting base (511) is provided with a lifting member (53) for driving the magnetic seat (512) to move up and down.

2. The wastewater treatment device for thermal power plants according to claim 1, characterized in that, The lifting component (53) includes a dual-axis motor (531), which is fixedly installed in the middle section of the mounting base (511). Both output shafts of the dual-axis motor (531) are equipped with drive gears (532). A lifting rack (533) that meshes with the drive gears (532) is slidably installed on the mounting base (511) in the vertical direction. The bottom end of the lifting rack (533) is fixedly connected to the magnetic base (512) through a lifting rod (534).

3. The wastewater treatment device for thermal power plants according to claim 2, characterized in that, A foam scraping component (6) is provided on the separation tank (3) and above the slag removal mechanism (5). The foam scraping component (6) includes a scraping seat (61) and a scraper (62). The scraping seat (61) is slidably disposed between the two side walls of the separation tank (3) along the length direction of the separation tank (3). The scraper (62) is rotatably disposed on the scraping seat (61) through a connecting piece (63).

4. The wastewater treatment device for thermal power plants according to claim 3, characterized in that, A pressing member (54) is provided on one side of the lifting member (53) for driving the connecting piece (63) to flip. When the connecting piece (63) flips, the scraper (62) moves above the water surface. The pressing member (54) includes a pressing rack (541). The pressing rack (541) is slidably disposed on the side of the drive gear (532) away from the lifting rack (533) and meshes with the drive gear (532). A pressing rod (542) is provided at the top of the pressing rack (541). A pressing block (543) is provided at the top of the pressing rod (542) for abutting against the connecting piece (63).

5. The wastewater treatment device for thermal power plants according to claim 4, characterized in that, The bottom of the pressing block (543) is provided with a driving column (544), and the connecting piece (63) is provided with a strip groove (631) for the driving column (544) to be inserted and slid. When the scraper (62) moves to inside or outside the water surface, the driving column (544) is located in the strip groove (631).

6. The wastewater treatment device for thermal power plants according to claim 3, characterized in that, The scraping seat (61) is provided with a mounting groove (611) for the connecting piece (63) to rotate. The end of the connecting piece (63) away from the pressing block (543) extends out of the mounting groove (611) and is connected to the scraping seat (61) by an elastic rope (633).

7. The wastewater treatment device for thermal power plants according to claim 1, characterized in that, The sliding assembly (52) includes a sliding motor (521), a lead screw (522), a guide rod (523), a first slider (524), and a second slider (525). The first slider (524) and the second slider (525) are respectively fixed at both ends of the mounting base (511). The lead screw (522) is rotatably disposed between the two end walls of the separation tank (3). The sliding motor (521) is disposed outside the separation tank (3), and the output shaft of the sliding motor (521) is fixedly connected to the lead screw (522). The guide rod (523) is fixedly connected between the two end walls of the separation tank (3). The first slider (524) has a threaded hole and is threadedly connected to the lead screw (522). The second slider (525) has a through hole and is slidably connected to the guide rod (523).

8. The wastewater treatment device for thermal power plants according to claim 1, characterized in that, A slag discharge channel (33) is formed between the vertical plate (41) and the end wall of the separation tank (3). A horizontal spiral conveyor (34) is provided in the slag discharge channel (33). A slag discharge cylinder (7) is vertically arranged outside the slag discharge channel (33). A vertical spiral conveyor (71) is provided inside the slag discharge cylinder (7). The bottom end of the slag discharge cylinder (7) is connected to the slag discharge channel (33) through the slag inlet (72). A slag outlet (73) is provided on one side of the top of the slag discharge cylinder (7).

9. The wastewater treatment device for thermal power plants according to claim 1, characterized in that, An extension chamber (35) is provided on the outer side of the separation tank (3). An opening and closing component (36) is provided between the extension chamber (35) and the end wall of the separation tank (3). The opening and closing component (36) is located above the slag discharge channel (33). The opening and closing component (36) includes an opening and closing plate (361) and an opening and closing electric cylinder (362) for driving the opening and closing plate (361) to rise and fall.

10. The wastewater treatment device for thermal power plants according to claim 1, characterized in that, The closure (25) includes a gate (251) and a lifting cylinder (252). The gate (251) is slidably disposed on the baffle (21) and can close the through slot. A lifting rod (253) is disposed on the gate (251). The lifting cylinder (252) is disposed on one side of the baffle (21) and the piston rod of the lifting cylinder (252) is fixedly connected to the lifting rod (253).

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