A neutralization tank for desulfurization wastewater pretreatment and a method for desulfurization wastewater pretreatment

Abstract

This invention relates to the technical field of desulfurization wastewater treatment, and mainly discloses a desulfurization wastewater pretreatment neutralization tank and a desulfurization wastewater pretreatment method. The tank includes a water tank for storing wastewater, a rotating support in the middle of the tank, and an interior mixing zone and a settling zone. A stirring assembly includes a first-direction stirring element and a second-direction stirring element fixedly mounted on the rotating support. The first-direction stirring element is located within the mixing zone, and the second-direction stirring element is located at the boundary between the mixing zone and the settling zone. A cleaning assembly includes an edge cleaning element and a floating cleaning element. The edge cleaning element is fixed on the rotating support and contacts the inner wall of the tank, while the floating cleaning element is movably mounted on the first-direction stirring element. This invention solves the problems of low working efficiency and lack of self-cleaning ability of the stirring elements inside existing neutralization tanks, as well as the complexity of the desulfurization wastewater pretreatment process.

Description

Technical Field

[0001] This invention relates to the technical field of desulfurization wastewater treatment, and in particular to a desulfurization wastewater pretreatment neutralization tank and a desulfurization wastewater pretreatment method. Background Technology

[0002] In industrial production, especially in industries such as coal-fired power plants, the effective treatment of desulfurization wastewater is crucial. Currently, the solids content of desulfurization wastewater often far exceeds design standards, reaching as high as 4%–5% or even 10% in actual operation. This far exceeds the 1%–3% design capacity of the treatment system, leading to frequent sludge blockages, overload operation, and difficulty in meeting effluent quality standards. For example, when the solids content exceeds 4%, the common triplex tank is prone to sludge buildup, seriously affecting the stable operation of the entire desulfurization system.

[0003] Existing neutralization tanks for desulfurization wastewater pretreatment have significant drawbacks. The internal agitator design is relatively traditional, with a single type of agitator blade and a fixed rotation speed. This makes it difficult to effectively adjust the agitator according to different wastewater quality parameters and treatment requirements, resulting in uneven mixing of reagents and wastewater, low agitation efficiency, and severely affecting the sufficiency and rate of the neutralization reaction. Furthermore, the agitator lacks a cleaning function for the inner wall of the neutralization tank. As the treatment process continues, suspended solids and crystals in the wastewater easily adhere to the inner wall of the tank, gradually forming stubborn scale. This not only affects the effective volume of the tank but may also breed bacteria, causing secondary pollution of the water quality. Moreover, the tank lacks a self-cleaning mechanism, requiring regular manual cleaning, which consumes significant manpower and resources, increasing operating costs and maintenance difficulty.

[0004] Furthermore, conventional desulfurization wastewater pretreatment processes are cumbersome. For example, the effluent from the clarifier must pass through numerous devices such as multi-media filters, cation beds, ultrafiltration, and security filters before entering the reverse osmosis membrane concentration stage. This not only makes operation and management inconvenient but also significantly increases equipment investment and maintenance costs. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is that the existing internal stirring components of the neutralization tank have low working efficiency and lack self-cleaning ability, and the pretreatment process of desulfurization wastewater is complicated.

[0006] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a desulfurization wastewater pretreatment neutralization tank, which includes a tank for storing wastewater, a rotating support in the middle of the tank, and the interior of the tank includes a mixing zone and a settling zone; a stirring assembly including a first-direction stirring component and a second-direction stirring component fixedly mounted on the rotating support; wherein the first-direction stirring component is located in the mixing zone, and the second-direction stirring component is located at the junction of the mixing zone and the settling zone; a cleaning assembly including an edge cleaning component and a floating cleaning component, wherein the edge cleaning component is fixed on the rotating support and contacts the inner wall of the tank, and the floating cleaning component is movably mounted on the first-direction stirring component.

[0007] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: the first directional stirring component includes a sliding seat and a circumferential stirring plate fixed at its bottom. The sliding seat includes a central moving block and a first support plate and a second support plate fixed at its top and bottom. A bearing sleeve is fixedly connected to the bottom of the second support plate. A bearing is fixedly connected inside the bearing sleeve. A slot is opened in the central moving block, and the slot is coaxial with the bearing. Grooves are also symmetrically opened on the opposite outer walls of the central moving block, and the grooves are connected to the slot through contact holes. A first lead screw is rotatably inserted into the bearing. The top of the first lead screw is rotatably inserted into the slot. A connecting tooth is fixedly connected to the circumferential outer wall of the top of the first lead screw, and the connecting tooth extends out from the contact hole.

[0008] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: the two end sidewalls of the circumferential stirring plate are symmetrically fixedly connected with fixed sleeves, the first screw is rotatably inserted into the fixed sleeve, and the top fixed sleeve is detachably fixed to the bearing sleeve; a mesh plate is fixed inside the circumferential stirring plate.

[0009] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: the rotating support includes a drive frame, a central frame and a rotating frame. The drive frame is horizontally placed at the top opening of the water tank. A first motor is fixedly connected to the middle of the top of the drive frame, and a reversing barrel is fixedly connected to its bottom. First gears are rotatably connected to the inner walls of the opposite sides of the reversing barrel. A rotating shaft is fixedly connected to the top of the central frame. The rotating shaft is fixedly connected to the output end of the first motor. A toothed groove is opened on its circumferential outer wall. The toothed groove meshes with the first gears on both sides.

[0010] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: a floating groove is provided at the bottom of the central frame, a floating rod is slidably inserted into the floating groove, and a first spring is fixedly connected between the floating rod and the bottom of the floating groove; a plurality of sets of limiting slots are equidistantly provided on the circumferential outer wall of the bottom of the central frame, a plurality of sets of limiting rods are fixedly connected to the outer wall of the bottom of the floating rod, and the limiting rods are slidably inserted into the limiting slots; a connecting ring is provided outside the central frame, the inner wall of the connecting ring is fixedly connected to the end of the limiting rod, a first hemispherical sleeve is fixedly connected to the outer wall of the connecting ring, and a second hemispherical sleeve is detachably fixedly connected to the first hemispherical sleeve, and an adaptation groove is provided at the bottom of the second hemispherical sleeve.

[0011] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: a turntable is detachably connected to the bottom end of the central frame, and rotating rods are fixedly connected at equal intervals to the outer circumferential wall of the turntable. A first side plate is fixedly connected to the ends of two opposing sets of rotating rods, and a first sliding rod is symmetrically fixedly connected to the inner wall of the first side plate. The second directional stirring component includes a fan plate and a rotating sleeve fixed on its arc surface. The rotating sleeve is rotatably sleeved outside the rotating rod. A third hemispherical sleeve is fixedly embedded in the fan plate. A ball rod is fixed between the fan plate and the connecting ring. The ball heads at both ends of the ball rod are rotatably engaged in the third hemispherical sleeve and the second hemispherical sleeve.

[0012] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: the rotating frame includes a rotating ring and a slide table fixedly connected to its opposite outer wall. A second side plate is also fixedly connected to the end of the slide table. A second slide rod is symmetrically fixed to the inner wall of the second side plate. The rotating ring is rotatably sleeved on the outside of the reversing barrel. The toothed blocks opened on its inner wall are meshed with the first gear. A slide rail is opened in the slide table. An internal groove is opened on the inner wall of the opposite slide rail. A toothed plate is fixedly connected in one side of the internal groove. The toothed plate slides in the groove and meshes with the connecting tooth. A second motor is fixedly connected to the top of the slide table near the rotating ring. A second lead screw is fixedly connected to the output shaft of the second motor. The second lead screw is rotatably inserted into the second side plate, and the center shift block is threadedly sleeved on the outside of the second lead screw.

[0013] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: the edge cleaning component includes a backing plate and a horizontal plate fixed at both ends thereto, a scraper is fixedly connected between the horizontal plates, the top horizontal plate is slidably sleeved outside the second sliding rod, the bottom horizontal plate is slidably sleeved outside the first sliding rod, and a second spring is connected between the horizontal plate and the anti-detachment caps fixed at the ends of the first and second sliding rods.

[0014] In a preferred embodiment of the desulfurization wastewater pretreatment and water tank of the present invention: the floating cleaning component includes a central block and push blocks and scraping screens fixed on opposite outer walls; the push blocks are threaded onto the outside of the first lead screw; the scraping screens are symmetrically arranged, the circumferential stirring plates are slidably inserted between the scraping screens, and the top and bottom of the inner wall of the scraping screens are symmetrically fixed with sweeping brushes.

[0015] To address the complexity of the aforementioned desulfurization wastewater pretreatment process, this invention proposes the following technical solution: a desulfurization wastewater pretreatment method, comprising the aforementioned desulfurization wastewater pretreatment neutralization tank, and further comprising the following steps: First, desulfurization wastewater flows into the neutralization tank; an online pH monitor collects data in real time, driving an automatic dosing device to add alkaline agents such as lime slurry to adjust the pH value to 7-9; when the turbidity sensor exceeds the standard, the stirring component automatically accelerates to promote the initial sedimentation of suspended solids; then, the neutralized wastewater enters the electrocoagulation system, where a conductivity meter and a heavy metal ion detector monitor the water quality, and when the turbidity exceeds the standard... The system automatically adjusts the electrolysis voltage and current generator output, and an internal camera observes the flocs. If the effect is unsatisfactory, it automatically adds polymeric flocculant. Next, the electrocoagulated effluent enters the centrifugal clarifier, where pressure sensors and flow meters transmit data to the PLC control system, which dynamically adjusts the rotation speed and running time. The PLC controls the intelligent sludge removal system to periodically clean the sludge based on data from the sludge thickness sensor. Finally, the wastewater flows into the multi-media filter, where turbidity and differential pressure sensors monitor the filtration status. When the threshold is reached, backwashing is initiated, first with combined air and water rinsing, and then with clean water for a second rinsing to ensure the filter media is clean.

[0016] The beneficial effects of this invention are as follows:

[0017] In this invention, the first directional agitator stirs the wastewater and reagents in the mixing zone in a circumferential direction, and the position of the first directional agitator is adjustable. During use, the distance between the first directional agitators on both sides and the center of the water tank can be equal or unequal, which can be flexibly adjusted according to the required situation to improve the stirring efficiency. The second directional agitator located at the bottom stirs in the opposite direction to the first directional agitator and works in conjunction with the first directional agitator to increase the wastewater flow rate.

[0018] During the mixing process of wastewater and reagents, solid impurities such as suspended solids and crystals will adhere to the first direction agitator and the inner wall of the water tank. The edge cleaning component and the floating cleaning component can scrape off the impurities on the first direction agitator and the inner wall of the water tank during the mixing process.

[0019] Furthermore, the desulfurization wastewater pretreatment process of the present invention can reduce the content of suspended solids, organic matter and heavy metals in wastewater, and has the advantages of good treatment effect, small equipment size, small footprint, stable and reliable operation, simple operation, low sludge production and high degree of automation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0021] Figure 1 The overall structure diagram of the neutralization tank for desulfurization wastewater pretreatment is shown;

[0022] Figure 2 A cross-sectional view of the neutralization tank for desulfurization wastewater pretreatment is shown;

[0023] Figure 3 The diagram shows the structural composition of the first direction stirring element in the neutralization tank of the desulfurization wastewater pretreatment.

[0024] Figure 4 The remaining structure diagram of the first direction stirring element of the neutralization tank for desulfurization wastewater pretreatment is shown;

[0025] Figure 5 A structural diagram of the rotating support structure of the neutralization tank for desulfurization wastewater pretreatment is shown.

[0026] Figure 6 A schematic diagram showing the connection between the central frame and the rotating frame of the neutralization tank in the desulfurization wastewater pretreatment process is shown.

[0027] Figure 7 A cross-sectional view of the central frame of the desulfurization wastewater pretreatment neutralization tank is shown;

[0028] Figure 8 A schematic diagram of the installation of the second-direction agitator in the neutralization tank for desulfurization wastewater pretreatment is shown.

[0029] Figure 9 A diagram of the rotating frame mechanism of the neutralization tank in the desulfurization wastewater pretreatment is shown.

[0030] Figure 10 It shows Figure 9 Enlarged view at point M;

[0031] Figure 11 It shows Figure 9 Enlarged view at point N;

[0032] Figure 12 The diagram shows the structure of the edge cleaning component of the neutralization tank in the desulfurization wastewater pretreatment process;

[0033] Figure 13 The diagram shows the structure of the floating cleaning component in the neutralization tank for desulfurization wastewater pretreatment;

[0034] Figure 14 A flowchart of a desulfurization wastewater pretreatment method is shown. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0036] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0037] Example 1

[0038] Reference Figures 1-14 The first embodiment of the present invention provides a desulfurization wastewater pretreatment neutralization tank, which includes a tank 100 for storing wastewater. A rotating support 101 is provided in the middle of the tank 100, and the interior of the tank 100 includes a mixing zone A1 and a settling zone A2.

[0039] The mixing zone A1 is the main reaction area for wastewater and neutralizing agents. After the reaction reaches a certain level, the resulting sediment will fall into the settling zone A2, thus separating the wastewater from the sediment.

[0040] The stirring assembly 200 includes a first directional stirring element 201 and a second directional stirring element 202, which are fixedly mounted on the rotating support 101.

[0041] The first directional agitator 201 is located in the mixing zone A1, and the second directional agitator 202 is located at the junction of the mixing zone A1 and the settling zone A2.

[0042] Furthermore, the first directional agitator 201 is arranged longitudinally, preferably in two sets on the left and right sides. The distance between the two types of first directional agitators 201 and the center of the water tank 100 can be adjusted independently and flexibly. The stirring plate surface of the first directional agitator 201 is in contact with the wastewater to increase the flow rate of the wastewater.

[0043] Furthermore, the main function of the first directional agitator 201 is to agitate the wastewater and reagents in the mixing zone A1, while the second directional agitator 202 moves in the opposite direction to the first directional agitator 201, which can cooperate with the first directional agitator 201 to agitate the wastewater more frequently and improve the mixing rate of wastewater and reagents.

[0044] Furthermore, the second directional agitator 202 located at the top of the settling zone A2 can confine the settled dirt within the settling zone A2 during the agitation process, preventing it from floating upwards and causing the relatively clean wastewater above to become turbid.

[0045] The cleaning component 300 includes an edge cleaning component 301 and a floating cleaning component 302. The edge cleaning component 301 is fixed on the rotating bracket 101 and contacts the inner wall of the water tank 100. The floating cleaning component 302 is movably disposed on the first direction stirring component 201.

[0046] The edge cleaning component 301 is used to clean the dirt attached to the inner wall of the water tank 100, while the floating cleaning component 302 is used to clean the dirt attached to the stirring plate surface of the first direction stirring component 201.

[0047] It should be noted that in this invention, the plate surface of the first directional agitator 201 is in direct contact with the wastewater, making it easier for dirt to adhere to it. In contrast, the agitator plate surface of the second directional agitator 202 is inclined and in contact with the wastewater. The dirt adhering to it will be washed off by the wastewater as the second directional agitator 202 rotates, so no secondary cleaning is required.

[0048] Specifically, the first directional stirring component 201 includes a sliding seat 201a and a circumferential stirring plate 201b fixed at its bottom. The sliding seat 201a includes a central moving block 201a-1 and a first support plate 201a-2 and a second support plate 201a-3 fixed at its top and bottom. A bearing sleeve 201a-4 is fixedly connected to the bottom of the second support plate 201a-3. The first support plate is integrally welded to the top of the central moving block 201a-1, while the second support plate 201a-3 is fixed to the bottom of the central moving block 201a-1 by bolts.

[0049] The bearing 201a-4a is fixedly connected inside the bearing sleeve 201a-4. The bearing 201a-4a is fixed inside the bearing sleeve 201a-4 and rotates. The center moving block 201a-1 has a slot 201a-1a, which is coaxial with the bearing 201a-4a.

[0050] The outer walls of the two opposite sides of the center moving block 201a-1 are also symmetrically provided with grooves 201a-1b, and the grooves 201a-1b and the slots 201a-1a are connected through contact holes 201a-1c. The grooves 201a-1b are preferably rectangular grooves.

[0051] A first lead screw 201a-5 is rotatably inserted into the bearing 201a-4a. The top of the first lead screw 201a-5 is rotatably inserted into the slot 201a-1a. A connecting tooth 201a-5a is fixedly connected to the outer circumferential wall of the top of the first lead screw 201a-5. The connecting tooth 201a-5a extends out from the contact hole 201a-1c. The connecting tooth 201a-5a is embedded in the first lead screw 201a-5.

[0052] The two ends of the circumferential stirring plate 201b are symmetrically fixedly connected with fixing sleeves 201b-1. The first lead screw 201a-5 is rotatably inserted into the fixing sleeve 201b-1. The top fixing sleeve 201b-1 and the bearing sleeve 201a-4 are detachably fixed. A screen plate 201b-2 is fixed inside the circumferential stirring plate 201b. The screen plate 201b-2 can effectively capture suspended impurities in the wastewater.

[0053] Furthermore, a stabilizing ring is fixedly sleeved on the outer wall of the first lead screw 201a-5. The stabilizing ring is tightly abutted against the ends of the top and bottom fixed sleeves 201b-1 to prevent the first lead screw 201a-5 from floating up and down when rotating.

[0054] The rotating support 101 includes a drive frame 101a, a center frame 101b, and a rotating frame 101c. The drive frame 101a is horizontally placed at the top opening of the water tank 100. A first motor 101a-1 is fixedly connected to the middle of the top of the drive frame 101a. The first motor 101a-1 is preferably a servo motor. A reversing barrel 101a-2 is also fixedly connected to its bottom end. A first gear 101a-2a is rotatably connected to the inner walls of the two opposite sides of the reversing barrel 101a-2.

[0055] A rotating shaft 101b-1 is fixedly connected to the top of the central frame 101b. The rotating shaft 101b-1 is fixedly connected to the output end of the first motor 101a-1. A toothed groove 101b-1a is opened on its circumferential outer wall. The toothed groove 101b-1a meshes with the first gears 101a-2a on both sides. When the first motor 101a-1 starts, it drives the central frame 101b to rotate as a whole through the rotating shaft 101b-1. The first gears 101a-2a mesh with the toothed groove 101b-1a on the rotating shaft 101b-1, so the first gears 101a-2a are also driven to rotate by the rotating shaft 101b-1.

[0056] A floating groove 101b-2 is provided at the bottom of the central frame 101b. A floating rod 101b-3 is slidably inserted into the floating groove 101b-2. A first spring T1 is fixedly connected between the floating rod 101b-3 and the bottom of the floating groove 101b-2. In its natural state, the first spring T1 lifts the floating rod 101b-3 upward.

[0057] The bottom circumferential outer wall of the central frame 101b is provided with several sets of limiting slots 101b-4 at equal intervals. The bottom outer wall of the floating rod 101b-3 is fixedly connected with several sets of limiting rods 101b-3a, and the limiting rods 101b-3a are slidably inserted into the limiting slots 101b-4.

[0058] In this embodiment, four sets of limiting slots 101b-4 and limiting rods 101b-3a are preferably provided. When the floating rod 101b-3 is lifted, the limiting rod 101b-3a abuts against the inner wall of the top of the limiting slot 101b-4.

[0059] A connecting ring 101b-3b is provided outside the center frame 101b. The inner wall of the connecting ring 101b-3b is fixedly connected to the end of the limiting rod 101b-3a. A first hemispherical sleeve 101b-3c is fixedly connected to the outer wall of the connecting ring 101b-3b. A second hemispherical sleeve 101b-3d is detachably and fixedly connected to the first hemispherical sleeve 101b-3c. An adapter groove 101b-3d1 is provided at the bottom of the second hemispherical sleeve 101b-3d. The ball head is detachably mounted on the first hemispherical sleeve 101b-3c by bolts. The second hemispherical sleeve 101b-3d has a through hole, and the adapter groove 101b-3d1 is located below the second hemispherical sleeve 101b-3d. The size of the through hole and the size of the adapter groove 101b-3d1 on the second hemispherical sleeve 101b-3d are both smaller than the size of the ball head storage space formed by the first hemispherical sleeve 101b-3c and the second hemispherical sleeve 101b-3d, which can prevent the ball head installed inside from falling off.

[0060] A turntable 101b-5 is detachably connected to the bottom of the central frame 101b. Rotating rods 101b-5a are fixedly connected at equal intervals to the outer circumference of the turntable 101b-5. Preferably, four sets of rotating rods 101b-5a are provided. Among them, the ends of two opposite sets of rotating rods 101b-5a are fixedly connected to a first side plate 101b-5b. The inner wall of the first side plate 101b-5b is symmetrically fixedly connected to a first sliding rod 101b-5b1.

[0061] The second directional stirring component 202 includes a fan plate 202a and a rotating sleeve 202b fixed on its arc surface. The rotating sleeve 202b is rotatably sleeved outside the rotating rod 101b-5a. A third hemispherical sleeve 202c is fixedly embedded inside the fan plate 202a. A ball rod 202d is fixed between the fan plate 202a and the connecting ring 101b-3b. The ball heads at both ends of the ball rod 202d are rotatably engaged in the third hemispherical sleeve 202c and the second hemispherical sleeve 101b-3d.

[0062] In its natural state, the connecting ring 101b-3b at the top lifts the fan plate 202a upwards via the ball rod 202d. At this time, the fan plate 202a rotates around the rotating rod 101b-5a via the rotating sleeve 202b and deflects upwards at a certain angle. In this embodiment, the deflection angle is preferably 30°.

[0063] Reference Figure 8During the wastewater mixing process, the second direction stirring element 202 located at the bottom rotates counterclockwise around the central frame 101b. At this time, the rotating sleeve 202b is the contact point between the fan plate 202a and the wastewater. During the rotation, due to the unstable water flow, the tail of the fan plate 202a that is raised will occasionally be pressed down. At this time, the fan plate 202a will slightly pull down the floating insert rod 101b-3 through the ball rod 202d, and the first spring T1 will be stretched. When the water flow is relatively stable, the first spring T1 will retract, and the tail of the fan plate 202a will be raised again.

[0064] When the water tank needs to be drained, the second direction agitator 202 rotates clockwise. At this time, the raised plate tail is the starting point for contact with the wastewater, and the raised plate tail will always give the dirt below a downward oblique pushing force, which facilitates the discharge of dirt.

[0065] The rotating frame 101c includes a rotating ring 101c-1 and a slide 101c-2 fixedly connected to its opposite outer wall. A second side plate 101c-3 is also fixedly connected to the end of the slide 101c-2. A second slide rod 101c-3a is symmetrically fixed to the inner wall of the second side plate 101c-3. Preferably, the slide 101c-2 adopts a rectangular strip structure and is symmetrically welded to the outer wall of the rotating ring 101c-1.

[0066] The rotating ring 101c-1 is rotatably sleeved on the outside of the reversing barrel 101a-2, and the toothed block 101c-1a on its inner wall meshes with the first gear 101a-2a.

[0067] During use, the rotating ring 101c-1 meshing with the first gear 101a-2a will be driven to rotate by the first gear 101a-2a, thereby driving the rotating frame 101c to rotate as a whole.

[0068] The slide table 101c-2 has a slide rail 101c-2a inside, and the inner wall of the opposite slide rail has an internal groove 101c-2b. A toothed plate 101c-2c is fixedly connected in the internal groove 101c-2b on one side. The toothed plate 101c-2c slides in the groove 201a-1b and engages with the connecting tooth 201a-5a.

[0069] A second motor 101c-2d is fixedly connected to the top of the slide table 101c-2 near the rotating ring 101c-1. The second motor 101c-2d is preferably a servo motor. A second lead screw 101c-2d1 is fixedly connected to the output shaft of the second motor 101c-2d. The second lead screw 101c-2d1 is rotatably inserted into the second side plate 101c-3, and the center moving block 201a-1 is threaded onto the outside of the second lead screw 101c-2d1.

[0070] During use, the positions of the first direction stirring pieces 201 on both sides can be controlled by the second motors 101c-2d on both sides respectively.

[0071] Furthermore, the second lead screw 101c-2d1 is threadedly connected to the center moving block 201a-1, thereby driving the sliding bracket 201a to move within the slide table 101c-2. During the movement, the connecting teeth 201a-5a on the first lead screw 201a-5 mesh with the toothed plate 101c-2c, thereby driving the first lead screw 201a-5 to rotate as a whole.

[0072] The edge cleaning component 301 includes a backing plate 301a and horizontal plates 301b fixed at both ends thereon. A scraper 301c is fixedly connected between the horizontal plates 301b. The top horizontal plate 301b is slidably sleeved outside the second slide rod 101c-3a, and the bottom horizontal plate 301b is slidably sleeved outside the first slide rod 101b-5b1. A second spring T2 is connected between the horizontal plate 301b and the anti-detachment cap 101c-3a1 fixed at the end of the first slide rod 101b-5b1 and the second slide rod 101c-3a.

[0073] In its natural state, the edge cleaning component 301 is pulled into the water tank 100 by the second spring T2, and the scraping head of the scraper 301c is disengaged from the inner wall of the water tank 100. Only when the abutment plate 301a is pushed and the scraping head of the scraper 301c is in contact with the inner wall of the water tank will the scraper 301c clean the dirt on the inner wall of the water tank 100.

[0074] The floating cleaning component 302 includes a central block 302a and push blocks 302b and scraping screen 302c fixed on the outer walls of opposite sides; the push block 302b is threaded onto the outside of the first lead screw 201a-5.

[0075] The scraping screens 302c are symmetrically arranged, and the circumferential stirring plates 201b are slidably inserted between the scraping screens 302c. The top and bottom of the inner wall of the scraping screens 302c are symmetrically fixed with sweeping brushes 302c-1.

[0076] During use, when the first lead screw 201a-5 rotates as a whole, the push block 302b, which is threaded onto its outside, will not rotate with the first lead screw 201a-5 under the limit of the scraping screen 302c. Instead, it will only move up and down. At this time, the floating cleaning part 302 will move up and down on the first lead screw 201a-5.

[0077] Furthermore, as the floating cleaning component 302 moves up and down, the sweeping brush 302c-1 will clean off the dirt attached to the circumferential stirring plate 201b and the mesh plate 201b-2.

[0078] Example 2

[0079] Reference Figures 1-14This is the second embodiment of the present invention, which differs from the first embodiment in that: a method for pretreating desulfurization wastewater includes the above-mentioned desulfurization wastewater pretreatment neutralization tank, and further includes the following steps:

[0080] First, the desulfurization wastewater flows into the neutralization tank. The online pH monitor collects data in real time and drives the automatic dosing device to add alkaline agents such as lime slurry to adjust the pH value to 7-9. When the turbidity sensor exceeds the standard, the stirring component automatically speeds up to promote the initial sedimentation of suspended solids.

[0081] Then, the neutralized wastewater enters the electrocoagulation system, where a conductivity meter and a heavy metal ion detector monitor the water quality. If the water quality exceeds the standard, the system automatically adjusts the electrolysis voltage of the electrode plate and the output of the current generator. The system's camera observes the flocs, and if the effect is not good, it automatically adds polymeric flocculant.

[0082] Secondly, the effluent from electrocoagulation enters the centrifugal clarifier. The pressure sensor and flow meter transmit data to the PLC control system, which dynamically adjusts the rotation speed and running time accordingly. The PLC controls the intelligent sludge removal system to clean the sludge periodically based on the sludge thickness sensor data.

[0083] Finally, the wastewater flows into the multi-media filter, where turbidity and differential pressure sensors monitor the filtration status. When the threshold is reached, backwashing is initiated, first with a combined air and water rinse, and then with clean water for a second rinse to ensure the filter media is clean.

[0084] Specifically, firstly, the desulfurization wastewater enters the wastewater buffer tank, where it is buffered and its water quality is initially adjusted. The wastewater stays in the buffer tank for 15 to 30 minutes to ensure that the flow rate of the wastewater entering the neutralization tank is relatively stable.

[0085] Next, the wastewater flows into the neutralization tank. During this process, an online pH monitor continuously monitors the pH value of the wastewater in the neutralization tank. When the pH value is below 7, the automatic dosing device is activated, adding lime slurry and sodium hydroxide. The initial dosage of lime slurry is 500-1000 mg / L, and the dosage of sodium hydroxide is 100-300 mg / L, gradually raising the pH value to 7-9. Simultaneously, when the turbidity sensor detects that the wastewater turbidity exceeds 100-200 NTU, the stirring component increases its speed from the initial 100-150 rpm to 200-300 rpm and stirs for 10-20 minutes to ensure that the reagents are fully mixed with the wastewater and promote the initial sedimentation of suspended solids.

[0086] The pre-treated wastewater is then pumped to the electrocoagulation system at a flow rate of 10-50 m³ / h. Within the electrocoagulation system, a conductivity meter and a heavy metal ion detector monitor the water quality in real time. When the concentration of heavy metal ions (such as Cu²⁺, Zn²⁺, Pb²⁺, etc.) exceeds 0.5-1 mg / L, the system automatically adjusts the electrolysis voltage (5-20V) and the current generator output (current density 10-50 A / m²). Simultaneously, a camera within the system observes floc formation. If the average floc size is less than 0.5-1 mm, a polymeric flocculant (such as polyacrylamide, PAM) is automatically added at a dosage of 1-5 mg / L to assist in the formation of larger flocs.

[0087] Next, the electrocoagulated effluent enters the centrifugal clarifier. During this process, pressure sensors and flow meters transmit data to the PLC control system. When the influent pressure is 0.2~0.5MPa and the flow rate is 5~30m³ / h, the PLC control system dynamically adjusts the centrifugal clarifier's rotation speed (1000~3000rpm) for 15~30 minutes. Furthermore, based on data from the sludge thickness sensor in the inclined tube sedimentation zone (when the sludge thickness exceeds 10~20cm), the PLC control system controls the intelligent sludge discharge system to periodically discharge sludge every 2~4 hours, with each discharge volume being 0.5~2m³.

[0088] Next, the centrifuged and clarified wastewater enters a multi-media filter. During this process, a turbidity monitor and a differential pressure sensor monitor the filtration status in real time. When the turbidity difference between the filter inlet and outlet reaches 5-10 NTU and lasts for 10-20 minutes, or the differential pressure exceeds 0.1-0.2 MPa, the backwashing procedure is initiated. First, a combined air-water backwash is performed, with an air flow rate of 5-10 m³ / h, a water flow rate of 10-20 m / h, and a backwashing time of 5-10 minutes. Then, a second backwash is performed using a backwash water pump, with a clean water flow rate of 10-20 m³ / h and a rinsing time of 5-10 minutes, ensuring the filter media is clean and deeply filtering any remaining suspended solids.

[0089] Subsequently, the water treated by the multi-media filter enters the intermediate water tank and stays for 10 to 20 minutes. Then, the intermediate water pump (flow rate of 5 to 30 m³ / h) transports the water from the intermediate water tank to the next stage of treatment unit.

[0090] Afterward, the water enters the clear water tank and remains there for 15–30 minutes. During this process, sodium hypochlorite and hydrochloric acid are added as needed. The sodium hypochlorite dosage is 5–10 mg / L, and the hydrochloric acid dosage is adjusted according to the final pH requirement to ensure that the pH of the effluent from the product water tank is between 6.5 and 8.5. Finally, a clear water pump (flow rate of 5–30 m³ / h) delivers the clear water to the product water tank for storage.

[0091] During this process, if any stage detects substandard water quality (such as excessive heavy metal ions or turbidity), the substandard water is returned to the wastewater buffer tank or neutralization tank for reprocessing. Simultaneously, the sludge discharged from the centrifugal clarifier is dewatered by a screw press and then transported to a sludge tank by a sludge transfer pump. The sludge in the sludge tank can then undergo further treatment, such as drying, landfilling, or incineration.

[0092] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A neutralization tank for desulfurization wastewater pretreatment, characterized in that: include, A water tank (100) is used to store wastewater. A rotating support (101) is provided in the middle of the water tank (100), and the interior of the water tank (100) includes a mixing zone (A1) and a settling zone (A2). The stirring assembly (200) includes a first directional stirring element (201) and a second directional stirring element (202) fixedly mounted on a rotating support (101). Wherein, the first directional agitator (201) is located within the mixing zone (A1), and the second directional agitator (202) is located at the boundary between the mixing zone (A1) and the settling zone (A2); and, The cleaning assembly (300) includes an edge cleaning component (301) and a floating cleaning component (302). The edge cleaning component (301) is fixed on the rotating bracket (101) and contacts the inner wall of the water tank (100). The floating cleaning component (302) is movably disposed on the first direction stirring component (201). The first directional stirring component (201) includes a sliding seat (201a) and a circumferential stirring plate (201b) fixed at its bottom. The sliding seat (201a) includes a central moving block (201a-1) and a first support plate (201a-2) and a second support plate (201a-3) fixed at its top and bottom. A bearing sleeve (201a-4) is fixedly connected to the bottom of the second support plate (201a-3). The bearing sleeve (201a-4) is fixedly connected to the bearing (201a-4a), and the center moving block (201a-1) is provided with a slot (201a-1a), which is coaxial with the bearing (201a-4a). The outer walls of the two opposite sides of the central moving block (201a-1) are also symmetrically provided with grooves (201a-1b), and the grooves (201a-1b) and the slots (201a-1a) are connected through contact holes (201a-1c). A first lead screw (201a-5) is rotatably inserted into the bearing (201a-4a). The top of the first lead screw (201a-5) is rotatably inserted into the slot (201a-1a). A connecting tooth (201a-5a) is fixedly connected to the outer circumferential wall of the top of the first lead screw (201a-5). The connecting tooth (201a-5a) extends out from the contact hole (201a-1c). The circumferential stirring plate (201b) has fixed sleeves (201b-1) symmetrically fixed to its two end side walls. The first lead screw (201a-5) is rotatably inserted into the fixed sleeve (201b-1). The fixed sleeve (201b-1) at the top end is detachably fixed to the bearing sleeve (201a-4). A mesh plate (201b-2) is fixed inside the circumferential stirring plate (201b).

2. The desulfurization wastewater pretreatment neutralization tank according to claim 1, characterized in that: The rotating support (101) includes a drive frame (101a), a center frame (101b), and a rotating frame (101c). The drive frame (101a) is horizontally placed at the top opening of the water tank (100). A first motor (101a-1) is fixedly connected to the middle of the top of the drive frame (101a), and a reversing barrel (101a-2) is fixedly connected to its bottom. A first gear (101a-2a) is rotatably connected to the inner walls of the two opposite sides of the reversing barrel (101a-2). The top of the central frame (101b) is fixedly connected to a rotating shaft (101b-1), which is fixedly connected to the output end of the first motor (101a-1). The rotating shaft (101b-1) has a toothed groove (101b-1a) on its circumferential outer wall, which meshes with the first gears (101a-2a) on both sides.

3. The desulfurization wastewater pretreatment neutralization tank according to claim 2, characterized in that: The bottom end of the central frame (101b) is provided with a floating groove (101b-2), and a floating rod (101b-3) is slidably inserted into the floating groove (101b-2). A first spring (T1) is fixedly connected between the floating rod (101b-3) and the bottom of the floating groove (101b-2). The bottom circumferential outer wall of the central frame (101b) is provided with several sets of limiting slots (101b-4) at equal intervals. The bottom outer wall of the floating rod (101b-3) is fixedly connected with several sets of limiting rods (101b-3a). The limiting rods (101b-3a) are slidably inserted into the limiting slots (101b-4). A connecting ring (101b-3b) is provided outside the central frame (101b). The inner wall of the connecting ring (101b-3b) is fixedly connected to the end of the limiting rod (101b-3a). A first hemispherical sleeve (101b-3c) is fixedly connected to the outer wall of the connecting ring (101b-3b). A second hemispherical sleeve (101b-3d) is also detachably and fixedly connected to the first hemispherical sleeve (101b-3c). An adapter groove (101b-3d1) is provided at the bottom of the second hemispherical sleeve (101b-3d).

4. The desulfurization wastewater pretreatment neutralization tank according to claim 3, characterized in that: The bottom of the central frame (101b) is detachably connected to a turntable (101b-5). Rotating rods (101b-5a) are fixedly connected at equal intervals to the outer circumferential wall of the turntable (101b-5). The ends of two opposing sets of rotating rods (101b-5a) are fixedly connected to a first side plate (101b-5b). The inner wall of the first side plate (101b-5b) is symmetrically fixedly connected to a first sliding rod (101b-5b1). The second directional stirring component (202) includes a fan plate (202a) and a rotating sleeve (202b) fixed on its arc surface. The rotating sleeve (202b) is rotatably sleeved outside the rotating rod (101b-5a). A third hemispherical sleeve (202c) is fixedly embedded inside the fan plate (202a). A ball rod (202d) is fixed between the fan plate (202a) and the connecting ring (101b-3b). The ball heads at both ends of the ball rod (202d) are rotatably engaged inside the third hemispherical sleeve (202c) and the second hemispherical sleeve (101b-3d).

5. The desulfurization wastewater pretreatment neutralization tank according to claim 4, characterized in that: The rotating frame (101c) includes a rotating ring (101c-1) and a slide (101c-2) fixedly connected to its opposite outer wall. A second side plate (101c-3) is also fixedly connected to the end of the slide (101c-2). A second slide rod (101c-3a) is symmetrically fixed to the inner wall of the second side plate (101c-3). The rotating ring (101c-1) is rotatably sleeved on the outside of the reversing barrel (101a-2), and the toothed block (101c-1a) on its inner wall meshes with the first gear (101a-2a); The slide table (101c-2) has a slide rail (101c-2a) and an inner groove (101c-2b) on the inner wall of the slide rail. A toothed plate (101c-2c) is fixedly connected in the inner groove (101c-2b) on one side. The toothed plate (101c-2c) slides in the groove (201a-1b) and engages with the connecting tooth (201a-5a). The slide (101c-2) is fixedly connected to the top of the end near the rotating ring (101c-1) by a second motor (101c-2d). A second lead screw (101c-2d1) is fixedly connected to the output shaft of the second motor (101c-2d). The second lead screw (101c-2d1) is rotatably inserted into the second side plate (101c-3), and the center moving block (201a-1) is threaded onto the outside of the second lead screw (101c-2d1).

6. The desulfurization wastewater pretreatment neutralization tank according to claim 5, characterized in that: The edge cleaning component (301) includes a backing plate (301a) and horizontal plates (301b) fixed at both ends thereon. A scraper (301c) is fixedly connected between the horizontal plates (301b). The top horizontal plate (301b) is slidably sleeved on the outside of the second slide rod (101c-3a), and the bottom horizontal plate (301b) is slidably sleeved on the outside of the first slide rod (101b-5b1). A second spring (T2) is connected between the horizontal plate (301b) and the anti-detachment cap (101c-3a1) fixed at the end of the first slide rod (101b-5b1) and the second slide rod (101c-3a).

7. The desulfurization wastewater pretreatment neutralization tank according to any one of claims 3 to 6, characterized in that: The floating cleaning component (302) includes a central block (302a) and push blocks (302b) and scraping mesh plates (302c) fixed on opposite outer walls; the push block (302b) is threaded onto the outside of the first lead screw (201a-5); The scraping screen (302c) is symmetrically arranged, and the circumferential stirring plate (201b) is slidably inserted between the scraping screen (302c). The top and bottom of the inner wall of the scraping screen (302c) are symmetrically fixed with sweeping brushes (302c-1).

8. A method for pretreatment of desulfurization wastewater, characterized in that: The desulfurization wastewater pretreatment neutralization tank according to any one of claims 1 to 7 further includes the following steps: First, the desulfurization wastewater flows into the neutralization tank. The online pH monitor collects data in real time and drives the automatic dosing device to add lime milk alkaline agent to adjust the pH value to 7-9. When the turbidity sensor exceeds the standard, the stirring component automatically speeds up to promote the initial sedimentation of suspended solids. Then, the neutralized wastewater enters the electrocoagulation system, where a conductivity meter and a heavy metal ion detector monitor the water quality. If the water quality exceeds the standard, the electrolysis voltage of the electrode plate and the output of the current generator are automatically adjusted. The camera in the system observes the flocs. If the effect is not good, polymeric flocculant is automatically added. Secondly, the effluent from electrocoagulation enters the centrifugal clarifier. The pressure sensor and flow meter transmit data to the PLC control system, which dynamically adjusts the speed and running time accordingly. The PLC controls the intelligent sludge removal system to clean the sludge periodically based on the sludge thickness sensor data. Finally, the wastewater flows into the multi-media filter, where turbidity and differential pressure sensors monitor the filtration status. When the threshold is reached, backwashing is initiated, first with a combined air and water rinse, and then with clean water for a second rinse to ensure the filter media is clean.

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