Recovery equipment and recovery method for papermaking wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and particularly discloses papermaking wastewater recycling equipment and a recycling method.The papermaking wastewater recycling equipment comprises a recycling tank and a top cover, a treatment tank is fixedly connected to the interior of the recycling tank, and a filtering mechanism and a recycling mechanism are arranged in the treatment tank; when the adjacent partition plates are communicated with an internal flow channel of the supporting seat, waste water is dynamically filtered through the filter element, the driving mechanism synchronously drives the filter element to rotate, mechanical self-cleaning of the surface of the filter element is achieved through a fixing structure of the supporting seat, and fiber retention is avoided. Filtered and intercepted fibers are discharged directionally through a discharging seat after being subjected to secondary screening through a secondary filter screen at the bottom under the pushing action of a rotating partition plate, efficient separation and recycling of the fibers and wastewater are achieved, the overflowing capacity of a filtering system is remarkably improved, the problem of bridging and blocking of a traditional static screen is effectively solved, the manual slag removal frequency is reduced, and the production cost is reduced. The continuous and stable operation of the wastewater treatment system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a recycling device and a recycling method for papermaking wastewater. Background Art

[0002] Papermaking is the process of making paper from plant fibers through pulping, papermaking, and post-processing. In the pulping stage, a uniform pulp is formed through raw material processing, beating, and mixing. In the papermaking stage, the fibers are interwoven into a mesh, pressed and dehydrated, dried, calendered, coated, and other post-processing to produce paper with different properties.

[0003] Each process of papermaking requires water as a medium to complete material transportation, fiber dissociation, impurity cleaning and process control. During the process, the water body is mixed with pollutants such as fibers, impurities and chemicals to form wastewater to be treated. This type of wastewater is usually rich in plant fibers. Existing recovery equipment mainly relies on screening devices such as grids and screens to achieve solid-liquid separation. When the screen aperture is reduced to improve the fiber retention efficiency, the flow resistance per unit area increases exponentially, resulting in a longer retention time of fibers on the screen surface, which can easily trigger a "bridging effect" and cause local blockage; if the fiber concentration in the wastewater is too high, the effective flow area of the traditional flat screen will decrease sharply, and frequent shutdowns are required for mechanical flushing or manual slag cleaning, which seriously restricts the continuous and stable operation of the wastewater treatment system.

[0004] Therefore, it is necessary to provide a recycling device and a recycling method for papermaking wastewater to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a recycling device and a recycling method for papermaking wastewater, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A papermaking wastewater recovery device comprises a recovery tank and a top cover. A treatment tank is fixedly connected to the interior of the recovery tank. A filtering mechanism and a recovery mechanism are provided inside the treatment tank. The filtering mechanism and the recovery mechanism are connected to each other via a driving mechanism to achieve kinetic energy transfer between the two. The filtering mechanism is fixedly installed inside the recovery tank via a supporting mechanism.

[0008] The filtering mechanism includes a support seat and a filter element, wherein the filter element is rotatably connected to the inside of the support seat, and a through groove is formed on the outside of the support seat;

[0009] The recovery mechanism includes a top plate rotatably connected to the top of the processing tank, a plurality of partitions are fixedly connected to the bottom of the support seat, a plurality of drive shafts are rotatably connected inside the top plate, each of the drive shafts is located between two adjacent partitions, the outer side of the drive shaft is rotatably connected to a movable sleeve, the outer sides of the two ends of the movable sleeve are respectively slidably connected to a movable seat, the outer side of the drive shaft is symmetrically provided with spiral grooves, each of the movable seats is respectively threadedly connected to the corresponding spiral groove, and a spring is fixedly connected between the movable seat and the movable sleeve.

[0010] As a further improvement of the above solution, a movable frame is symmetrically fixedly connected to the outer side of the movable seat, and a filter screen 1 is fixedly connected to the interior of the movable frame.

[0011] As a further improvement of the above solution, the support mechanism includes a support plate fixedly connected to the bottom of the recovery tank, the support seat is fixedly connected to the top of the support plate, and a plurality of filter screens are fixedly connected inside the support plate.

[0012] As a further improvement of the above solution, the driving mechanism includes a gear ring fixedly connected to the top of the recovery tank, a driving wheel fixedly connected to the top of the drive shaft, a driven wheel fixedly connected to the top of the filter element, and the driving wheel is meshedly connected between the gear ring and the driven wheel.

[0013] As a further improvement of the above scheme, a stirring mechanism is also provided inside the recovery tank, and the stirring mechanism includes a stirring rod and a cleaning rod. The stirring rod is symmetrically fixedly connected to the bottom of the filter element, and each cleaning rod is fixedly connected to the stirring rod, and each cleaning rod is in contact with the inner wall of the recovery tank.

[0014] As a further improvement of the above solution, a water inlet pipe is fixedly connected to the outside of the treatment tank, the water inlet pipe passes through the recovery tank, and the water inlet pipe is arranged along the tangential direction of the treatment tank.

[0015] As a further improvement of the above solution, a discharge seat is fixedly installed on the outer side of the recovery tank, and discharge ports are opened at the bottom of the recovery tank and the bottom of the processing tank, and the discharge ports are both connected to the discharge seat.

[0016] As a further improvement of the above solution, a stuffing tube is fixedly installed inside the top cover, and the bottom of the stuffing tube passes through the filter element.

[0017] A method for recycling papermaking wastewater comprises the following steps:

[0018] Step 1: Inject papermaking wastewater into the treatment tank through the water inlet pipe along the tangential direction, and use the water flow power to drive the top plate and partition to rotate;

[0019] Step 2: The top plate drives the drive shaft to rotate. Under the action of the spiral groove and the spring, the movable seat drives the filter screen to perform a composite movement of lifting and rotating. Through dynamic stirring, the fibers are adsorbed on the surface of the filter screen, achieving initial fiber retention.

[0020] Step 3: The filter element rotates synchronously with the top plate through the drive mechanism; when the area between adjacent partitions is connected to the support seat groove, the wastewater enters the filter element for filtration, and the support seat cleans the surface of the rotating filter element;

[0021] Step 4: The fibers intercepted by the filter element are pushed by the partition and enter the discharge seat through the discharge port to complete the fiber recovery.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The water inlet pipe adopts a tangential water inlet design. The water flow power drives the partition to drive the top plate to rotate. When the adjacent partitions are connected to the internal flow channel of the support seat, the wastewater is dynamically filtered through the filter element. The driving mechanism synchronously drives the filter element to rotate, and the fixed structure of the support seat is used to achieve mechanical self-cleaning of the filter element surface to avoid fiber retention. The fibers intercepted by the filtration are pushed by the rotating partition and screened for the second time by the bottom secondary filter screen. They are then discharged in a direction from the discharge seat, realizing efficient separation and recycling of fibers and wastewater, significantly improving the flow capacity of the filtration system, effectively avoiding the "bridging blockage" problem of traditional static screens, reducing the frequency of manual slag cleaning, and ensuring the continuous and stable operation of the wastewater treatment system.

[0024] 2. The top plate rotates and the coaxially connected drive shaft rotates synchronously. Through the coupling effect of the spiral groove and the spring, the movable seat drives the first-level filter to perform periodic lifting and rotating compound motion. The filter screen is dynamically stirred in the wastewater pool to form a primary filtration barrier, effectively intercepting fiber particles and reducing the load of the downstream filter element. When the fiber adsorption amount on the filter screen reaches the critical value, the axial force of the spiral groove pushes the filter screen down, and automatic backwashing is achieved through the friction of the longitudinal water flow. After cleaning is completed, the spring reset force returns the filter screen to its initial position and continues to work, thereby significantly improving the fiber interception efficiency and anti-clogging ability of the system, extending the service life of the filter element, and reducing operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the recovery tank of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the processing tank of the present invention;

[0029] Figure 4 Schematic diagram of the structure of the driving mechanism of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the support base of the present invention;

[0031] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at A in the middle;

[0032] Figure 7 It is a structural schematic diagram of the movable sleeve of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the support seat of the present invention.

[0034] In the figure: 1. Recovery tank; 2. Top cover; 3. Water inlet pipe; 4. Discharge seat; 5. Filling pipe; 6. Processing tank; 71. Filter mechanism; 711. Support seat; 712. Filter element; 72. Driving mechanism; 721. Ring gear; 722. Driving wheel; 723. Driven wheel; 73. Recovery mechanism; 731. Top plate; 732. Partition; 733. Drive shaft; 734. Movable sleeve; 735. Movable seat; 736. Movable frame; 737. Filter screen 1; 738. Spring; 74. Support mechanism; 741. Support plate; 742. Filter screen 2; 75. Stirring mechanism; 751. Stirring rod; 752. Cleaning rod. DETAILED DESCRIPTION

[0035] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] See also Figures 1 to 8 As shown, the present invention provides an embodiment:

[0037] A papermaking wastewater recovery device includes a recovery tank 1 and a top cover 2. The recovery tank 1 is fixedly connected to a processing tank 6. The processing tank 6 is provided with a filter mechanism 71 and a recovery mechanism 73. The filter mechanism 71 and the recovery mechanism 73 are connected to each other via a drive mechanism 72 to achieve kinetic energy transfer between the two. The filter mechanism 71 is fixedly mounted to the recovery tank 1 via a support mechanism 74.

[0038] The filter mechanism 71 includes a support base 711 and a filter element 712. The filter element 712 is rotatably connected to the interior of the support base 711. A through groove is formed on the outer side of the support base 711.

[0039] The recovery mechanism 73 includes a top plate 731 rotatably connected to the top of the processing tank 6, a plurality of partitions 732 are fixedly connected to the bottom of the support seat 711, a plurality of drive shafts 733 are rotatably connected to the inside of the top plate 731, each drive shaft 733 is located between two adjacent partitions 732, the outer side of the drive shaft 733 is rotatably connected to a movable sleeve 734, and the outer sides of the two ends of the movable sleeve 734 are respectively slidably connected to a movable seat 735, the outer side of the drive shaft 733 is symmetrically provided with spiral grooves, and each movable seat 735 is respectively threadedly connected to the corresponding spiral groove, and a spring 738 is fixedly connected between the movable seat 735 and the movable sleeve 734;

[0040] The outer side of the movable seat 735 is symmetrically fixedly connected to a movable frame 736, and the inner side of the movable frame 736 is fixedly connected to a filter 1 737;

[0041] The outside of the treatment tank 6 is fixedly connected with a water inlet pipe 3, which passes through the recovery tank 1 and is arranged along the tangent direction of the treatment tank 6;

[0042] A discharge seat 4 is fixedly installed on the outer side of the recovery tank 1 . A discharge port is provided at the bottom of the recovery tank 1 and the bottom of the processing tank 6 , and the discharge ports are both connected to the discharge seat 4 .

[0043] In practical application, the embodiment of the present invention is as follows: Figure 2 、 Figure 3 and Figure 4 As shown, papermaking wastewater is injected at high speed through the water inlet pipe 3 along the tangential direction of the treatment tank 6, forming a cyclonic power that drives the partition 732 to drive the top plate 731 to rotate, and then drives the filter element 712 to rotate synchronously through the driving mechanism 72. When the adjacent partitions 732 are connected to the internal flow channel of the support seat 711, the wastewater is dynamically filtered through the filter element 712 to implement preliminary solid-liquid separation;

[0044] At the same time, if Figures 4 to 7 As shown, the rotation of the top plate 731, through the coupling effect of the spiral groove on the outside of the drive shaft 733 and the spring 738, causes the movable seat 735 to drive the filter screen 1 737 to perform a periodic lifting and rotating compound motion. When the fiber adsorption amount on the filter screen 1 737 reaches a critical value, due to the increase in the rotational resistance, the axial component force of the spiral groove will overcome the elastic force of the spring 738 to push the filter screen assembly downward, and automatic backwashing is achieved through the friction of the longitudinal water flow. After cleaning is completed, the spring 738 returns to the initial position under the action of the elastic reset force to continue working, thereby significantly improving the fiber retention efficiency and anti-clogging ability of the system, extending the service life of the filter element, and reducing operation and maintenance costs.

[0045] like Figure 1 and Figure 2 As shown, the intercepted fibers enter the discharge seat 4 through the bottom discharge port under the pushing action of the rotating partition 732, and are discharged in a directional manner. The treated wastewater is further filtered by the support mechanism 74 and discharged from the discharge port at the bottom of the recovery tank 1, thereby realizing efficient separation and recycling of fibers and wastewater.

[0046] like Figure 4 and Figure 5 As shown, the support mechanism 74 includes a support plate 741 fixedly connected to the bottom of the recovery tank 1, a support seat 711 fixedly connected to the top of the support plate 741, and a plurality of filter screens 742 fixedly connected inside the support plate 741.

[0047] In actual application of the embodiment of the present invention, the support mechanism 74 provides stable support for the support seat 711 through the support plate 741, ensuring the stability of the filter element 712 during high-speed rotation. After the wastewater passes through the filter element 712 and completes preliminary filtration, it will continue to flow through the multiple filter screens 742 inside the support plate 741 for secondary fine filtration, further intercepting tiny fiber particles. The filter screens 742 are inclined, and the spiral downward motion of the water flow is used to allow the fiber particles to be efficiently deposited on the surface of the filter screens 742 under the dual effects of gravity and centrifugal force. When the deposition amount reaches a critical value, the shear force formed by the edge of the rotating partition 732 and the surface of the filter screen 742 automatically peels off the fiber layer on the filter screen, allowing it to enter the discharge seat 4 through the discharge port.

[0048] like Figure 4 and Figure 5 As shown, the driving mechanism 72 includes a gear ring 721 fixedly connected to the top of the recovery tank 1, a driving wheel 722 fixedly connected to the top of the driving shaft 733, and a driven wheel 723 fixedly connected to the top of the filter element 712, and the driving wheel 722 is meshedly connected between the gear ring 721 and the driven wheel 723.

[0049] In actual application of the embodiment of the present invention, the driving mechanism 72 transmits the rotational kinetic energy of the top plate 731 to the filter element 712 through the meshing transmission of the ring gear 721 and the driving wheel 722. When the wastewater is tangentially injected to drive the top plate 731 to rotate, the driving wheel 722 at the top of the drive shaft 733 performs planetary motion along the fixed ring gear 721, while driving the driven wheel 723 to drive the filter element 712 to rotate synchronously.

[0050] like Figure 2 and Figure 8As shown, a stirring mechanism 75 is also provided inside the recovery tank 1. The stirring mechanism 75 includes a stirring rod 751 and a cleaning rod 752. The stirring rod 751 is symmetrically fixedly connected to the bottom of the filter element 712. Each cleaning rod 752 is fixedly connected to the stirring rod 751, and each cleaning rod 752 is in contact with the inner wall of the recovery tank 1.

[0051] In actual application of the embodiment of the present invention, the stirring mechanism 75 rotates synchronously with the filter element 712 to stir the wastewater at the bottom of the recovery tank 1, and the elastic scraper of the cleaning rod 752 cleans the recovery tank 1.

[0052] like Figure 2 and Figure 3 As shown, a stuffing tube 5 is fixedly installed inside the top cover 2 , and the bottom of the stuffing tube 5 passes through the filter element 712 .

[0053] In actual application of the embodiment of the present invention, chemical reagents can be added in advance through the filling pipe 5 to achieve further treatment of the wastewater.

[0054] The present invention provides another embodiment:

[0055] A method for recycling papermaking wastewater comprises the following steps:

[0056] Step 1: inject papermaking wastewater into the treatment tank 6 through the water inlet pipe 3 along the tangential direction, and use the water flow power to drive the top plate 731 and the partition plate 732 to rotate;

[0057] Step 2: Top plate 731 drives drive shaft 733 to rotate. Under the action of spiral groove and spring 738, movable seat 735 drives filter screen 1 737 to perform a composite movement of lifting and rotating. Through dynamic stirring, the fibers are adsorbed on the surface of filter screen 1 737, achieving initial fiber retention.

[0058] Step 3: The filter element 712 rotates synchronously with the top plate 731 through the drive mechanism 72; when the area between adjacent partitions 732 is connected to the groove of the support seat 711, wastewater enters the filter element 712 for filtration, and the support seat 711 cleans the surface of the rotating filter element 712;

[0059] Step 4: The fibers intercepted by the filter element 712 are pushed by the partition 732 and enter the discharge seat 4 through the discharge port, completing the fiber recovery.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A papermaking wastewater recovery device, comprising a recovery tank (1) and a top cover (2), characterized in that: The interior of the recovery tank (1) is fixedly connected to a processing tank (6), and a filtering mechanism (71) and a recovery mechanism (73) are provided inside the processing tank (6). The filtering mechanism (71) and the recovery mechanism (73) are connected to each other by a driving mechanism (72) to achieve kinetic energy transmission between the two. The filtering mechanism (71) is fixedly installed inside the recovery tank (1) by a supporting mechanism (74); The filtering mechanism (71) comprises a support seat (711) and a filter element (712), wherein the filter element (712) is rotatably connected to the interior of the support seat (711), and a through groove is provided on the exterior of the support seat (711); The recovery mechanism (73) includes a top plate (731) rotatably connected to the top of the processing tank (6), a plurality of partitions (732) are fixedly connected to the bottom of the support seat (711), a plurality of drive shafts (733) are rotatably connected inside the top plate (731), each of the drive shafts (733) is located between two adjacent partitions (732), the outer side of the drive shaft (733) is rotatably connected to a movable sleeve (734), and the outer sides of both ends of the movable sleeve (734) are respectively slidably connected to a movable seat (735), the outer side of the drive shaft (733) is symmetrically provided with spiral grooves, and each movable seat (735) is respectively threadedly connected to the corresponding spiral groove, and a spring (738) is fixedly connected between the movable seat (735) and the movable sleeve (734).

2. The papermaking wastewater recovery device according to claim 1, characterized in that: The outer side of the movable seat (735) is symmetrically fixedly connected to a movable frame (736), and the interior of the movable frame (736) is fixedly connected to a filter screen 1 (737).

3. The papermaking wastewater recovery device according to claim 2, characterized in that: The support mechanism (74) comprises a support plate (741) fixedly connected to the bottom of the recovery tank (1), the support seat (711) fixedly connected to the top of the support plate (741), and a plurality of filter screens (742) fixedly connected inside the support plate (741).

4. The papermaking wastewater recovery device according to claim 2, characterized in that: The driving mechanism (72) comprises a gear ring (721) fixedly connected to the top of the recovery tank (1); a driving wheel (722) is fixedly connected to the top of the driving shaft (733); a driven wheel (723) is fixedly connected to the top of the filter element (712); and the driving wheel (722) is meshedly connected between the gear ring (721) and the driven wheel (723).

5. The papermaking wastewater recovery device according to claim 2, characterized in that: The recovery tank (1) is further provided with a stirring mechanism (75), the stirring mechanism (75) comprising a stirring rod (751) and a cleaning rod (752), the stirring rod (751) being symmetrically fixedly connected to the bottom of the filter element (712), each of the cleaning rods (752) being fixedly connected to the stirring rod (751), and each of the cleaning rods (752) being in contact with the inner wall of the recovery tank (1).

6. The papermaking wastewater recovery device according to claim 2, characterized in that: The outside of the treatment tank (6) is fixedly connected to a water inlet pipe (3), the water inlet pipe (3) passes through the recovery tank (1), and the water inlet pipe (3) is arranged along the tangent direction of the treatment tank (6).

7. The papermaking wastewater recovery device according to claim 3, characterized in that: A discharge seat (4) is fixedly installed on the outer side of the recovery tank (1), and discharge ports are provided at the bottom of the recovery tank (1) and the bottom of the processing tank (6), and the discharge ports are both connected to the discharge seat (4).

8. The papermaking wastewater recovery device according to claim 3, characterized in that: A stuffing tube (5) is fixedly mounted inside the top cover (2), and the bottom of the stuffing tube (5) passes through the filter element (712).

9. A method for recycling papermaking wastewater, the method being based on the papermaking wastewater recycling device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: injecting papermaking wastewater into the treatment tank (6) along the tangential direction through the water inlet pipe (3), and using the water flow power to drive the top plate (731) and the partition plate (732) to rotate; Step 2: The top plate (731) drives the driving shaft (733) to rotate. Under the action of the spiral groove and the spring (738), the movable seat (735) drives the filter screen (737) to perform a lifting and rotating compound motion. Through dynamic stirring, the fibers are adsorbed on the surface of the filter screen (737), thereby achieving preliminary fiber retention. Step 3: The filter element (712) rotates synchronously with the top plate (731) through the driving mechanism (72); when the area between adjacent partitions (732) is connected to the through groove of the support seat (711), wastewater enters the filter element (712) for filtration, and the support seat (711) cleans the surface of the rotating filter element (712); Step 4: The fibers intercepted by the filter element (712) are pushed by the partition (732) and enter the discharge seat (4) through the discharge port, completing the fiber recovery.

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