A multi-stage papermaking white water recycling system

Abstract

The application provides a papermaking white water multistage recycling system and relates to the technical field of papermaking wastewater treatment.The papermaking white water multistage recycling system comprises an outer pool and an inner pool, a blowdown valve is arranged outside the outer pool, a top frame is fixedly connected to the top of the outer pool, the inner pool is connected to the inside of the outer pool, hydraulic cylinders are arranged on the two sides of the outer pool and are connected with the inner pool, a supporting plate is fixedly connected to the top of the top frame, and an air pipe is arranged in the inner pool. The air delivered by the application is refined and discharged into the inner pool through an aeration head to provide necessary oxygen for aerobic microorganisms. The flocculating agent is dropped into the inner pool through a dropping vertical pipe, the papermaking white water is efficiently stirred by an impeller, the papermaking white water is fully mixed with the flocculating agent, and the content of suspended solids in the white water is effectively reduced. The application solves the problem of the current treatment method for papermaking white water, the dissolved additives and micro-fiber pollutants in the white water are difficult to be effectively removed, and the content of suspended solids in the treated white water is still high, which damages the quality of paper.

Description

Technical Field

[0001] This invention relates to the field of papermaking wastewater treatment technology, and in particular to a multi-stage papermaking white water reuse system. Background Technology

[0002] Papermaking white water mainly refers to the wastewater discharged from the papermaking system of papermaking machines in paper mills. Papermaking white water contains a large amount of fine fibers, sizing agents, preservatives, reinforcing agents and other impurities. Papermaking machines use a lot of water and discharge a lot of white water. Because papermaking white water contains a lot of impurities, it cannot be directly reused in production. Paper mills must treat the white water before it can be reused to reduce environmental pollution and save water resources.

[0003] For example, the Chinese patent "CN104631183B A device and method for efficient fiber recycling in a paper mill" includes connecting the discharge generated by the low-concentration slag remover and the tail slag fine screening treatment device at the end of the papermaking process to a waste recycling box via a conveying device. The waste recycling box is equipped with an inlet pipe connected to a white water pool at the top. The bottom of the waste recycling box is connected to a disc mill via a pipeline. The discharge port of the disc mill is connected to a multi-stage series low-concentration slag remover for recycled materials. The discharge port of the low-concentration slag remover for recycled materials is connected to a thickener via a grading screen system. The discharge port of the thickener is connected to the paper machine papermaking system via a conveying pipeline.

[0004] Currently, some paper mills still use relatively simple methods to treat white water, mainly relying on basic filtration and sedimentation processes. Large suspended solids and filter residue are removed from the white water through filtration equipment, and then fine particles and impurities are further separated in sedimentation tanks. Although this treatment method is simple and low-cost, it is difficult to effectively remove pollutants such as additives and fine fibers dissolved in the white water. As a result, the treated white water still has high suspended solids content and large fluctuations in chemical oxygen demand. Reusing white water that does not meet the standards will directly damage the quality of the paper. Summary of the Invention

[0005] This invention relates to a multi-stage recycling system for papermaking white water, which solves the problem that current methods of treating papermaking white water rely on basic filtration and sedimentation processes. While these processes are simple and low-cost, they are difficult to effectively remove dissolved additives and fine fibers and other pollutants from the white water. As a result, the treated white water still has high suspended solids content, large fluctuations in chemical oxygen demand, and the white water that does not meet the standards can be reused, thus damaging the quality of the paper.

[0006] In a first aspect, this invention provides a multi-stage white water recycling system for papermaking, specifically comprising: an outer tank, a drain valve, a top frame, an inner tank, hydraulic cylinders, a support plate, an air pipe, a solenoid air valve, a conveying pipe, a solenoid liquid valve, a rotating shaft, a motor, a transmission shaft, and guide pipes; a drain valve is installed on the outside of the outer tank, and a top frame is fixedly connected to the top of the outer tank; an inner tank is connected inside the outer tank, and hydraulic cylinders are installed on both sides of the outer tank, connected to the inner tank; a support plate is fixedly connected to the top of the top frame, and an air pipe is installed inside the inner tank, with a solenoid air valve connected to the end of the air pipe; a conveying pipe is fixedly connected to the top of the top frame, located between the top frame and the support plate, with a solenoid liquid valve connected to the end of the conveying pipe; a rotating shaft is connected inside the inner tank, and a motor is fixedly installed on the top of the support plate, with a transmission shaft rotatably connected inside the support plate, the drive shaft of the motor connected to the top of the transmission shaft, and the bottom of the transmission shaft connected to the top of the rotating shaft; guide pipes are installed on both sides of the outer tank.

[0007] Furthermore, an aeration head is installed at the bottom of the air pipe. The aeration head is located at the bottom of the inner pool, with a distance of 20 cm between the aeration head and the bottom of the pool. The air pipe is connected to the air supply equipment through an electromagnetic air valve. When the electromagnetic air valve is opened, the supplied air is aerated through the aeration head and discharged into the papermaking white water inside the inner pool, providing the necessary oxygen for aerobic microorganisms.

[0008] Furthermore, the rotating shaft is rotatably connected to the inner tank, and an impeller is installed on the outside of the rotating shaft. The motor is connected to the rotating shaft through a transmission shaft, and the motor drives the rotating shaft to rotate. The rotating impeller is used to stir the papermaking white water inside the inner tank, which can reduce the size of the bubbles, increase the number of bubbles, and improve the degree of liquid turbulence.

[0009] Furthermore, a dripping vertical pipe is installed at the bottom of the conveying pipe, which is located above the inner pool. The conveying pipe is connected to the flocculant supply equipment through a solenoid valve. When the solenoid valve is opened, the flocculant drips into the papermaking white water inside the inner pool through the dripping vertical pipe. The motor continuously drives the rotating shaft to rotate, and the impeller is used to efficiently stir the papermaking white water, so that the papermaking white water and flocculant are fully mixed.

[0010] Furthermore, the outer side of the inner pool slides in contact with the inner side of the outer pool, and ear plates are provided at both ends of the top of the inner pool. Movable holes are provided at both ends of the top frame. The ear plates are slidably connected in the movable holes. The vertical movement distance of the inner pool is limited by the sliding cooperation between the ear plates and the movable holes.

[0011] Furthermore, the cylinder body of the hydraulic cylinder is fixedly connected to the inner pool, and the end of the piston rod of the hydraulic cylinder is fixedly connected to the ear plate. The hydraulic cylinder applies a thrust to the inner pool, thereby driving the inner pool to rise and fall.

[0012] Furthermore, top outlets are provided on the top of both sides of the outer pool, and bottom outlets are provided on the bottom of both sides of the outer pool. The guide pipes are inclined, with one end of the guide pipe connected to the top outlet and the other end connected to the bottom outlet.

[0013] Furthermore, an external drain outlet is provided at the bottom of the outer pool, which is connected to the recycling pipeline. An internal drain outlet is provided on both sides of the inner pool, with a distance of 20 centimeters between the internal drain outlet and the bottom of the pool. The internal drain outlet is connected to the top drain outlet. When the hydraulic cylinder lifts the inner pool to the top, the internal drain outlet is connected to the top drain outlet. The purified papermaking white water inside the inner pool flows into the outer pool through the guide inclined pipe, and then is discharged into the recycling pipeline through the external drain outlet.

[0014] Furthermore, a spline groove is provided at the top of the rotating shaft, and a spline head is provided at the bottom of the transmission shaft. The spline head is slidably connected in the spline groove. When the hydraulic cylinder drives the inner pool to move up and down, the spline head slides in the spline groove.

[0015] Furthermore, the bottom of the outer pool is provided with an external sewage outlet, and the bottom of the inner pool is provided with an internal sewage outlet. The internal sewage outlet and the external sewage outlet are connected to the sewage valve. When the hydraulic cylinder drives the inner pool to fall to the bottom, the external sewage outlet and the sewage valve are connected. The sewage valve is opened, and the sludge is suspended and discharged with the water flow through the sewage valve by high-pressure flushing.

[0016] This invention provides a multi-stage white water recycling system for papermaking, which has the following beneficial effects: In use, the electromagnetic valve opens, and the supplied air is aerated through the aeration head and discharged into the papermaking white water inside the inner tank. This provides the necessary oxygen for aerobic microorganisms, enabling them to decompose dissolved organic matter in the white water and convert it into carbon dioxide and water, thereby reducing chemical oxygen demand (COD) and biochemical oxygen demand (BOD). During aeration, the motor drives the rotating shaft to rotate via the drive shaft. The rotating impeller agitates the papermaking white water inside the inner tank, reducing bubble size, increasing the number of bubbles, enhancing liquid turbulence, and extending the contact time between bubbles and water. This accelerates the transfer of oxygen from the gas phase to the liquid phase. The agitation ensures a uniform distribution of dissolved oxygen concentration, preventing localized hypoxia and ensuring efficient degradation of organic matter by aerobic microorganisms.

[0017] In addition, after the air flotation operation of the papermaking white water is completed, the electromagnetic liquid valve is opened, and the flocculant is dripped into the papermaking white water inside the inner tank through the dripping vertical pipe. The motor continuously drives the rotating shaft to rotate, and the impeller is used to efficiently stir the papermaking white water, so that the papermaking white water and flocculant are fully mixed. After the impeller stops running, the suspended solids, colloids and some dissolved substances in the water aggregate into larger flocs, and then achieve solid-liquid separation through gravity sedimentation, forming a sludge layer at the bottom of the inner tank.

[0018] Furthermore, the sliding fit between the ear plate and the movable hole limits the vertical movement distance of the inner pool. The hydraulic cylinder applies thrust to the inner pool, causing it to rise and fall. After the flocculation and sedimentation of the papermaking white water is completed, the hydraulic cylinder lifts the inner pool to the top. At this time, the inner drain outlet is connected to the top drain outlet. The purified papermaking white water inside the inner pool flows into the outer pool through the guide inclined pipe, and then is discharged into the recycling pipeline through the outer drain outlet, realizing the recycling of papermaking white water, significantly improving water resource utilization efficiency and reducing wastewater discharge. When the hydraulic cylinder moves the inner pool up and down, the spline head slides in the spline groove to ensure the transmission effect of the rotating shaft.

[0019] In addition, when the sludge layer at the bottom of the inner tank is thicker than 10 cm, the hydraulic cylinder drives the inner tank to fall to the bottom. At this time, the sewage outlet is connected to the sewage valve. Open the sewage valve and use high-pressure flushing to suspend the sludge and discharge it with the water flow through the sewage valve. The operation is simple.

[0020] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0022] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0023] In the attached diagram: Figure 1 This paper presents a schematic diagram of the overall top-axis structure of the multi-stage papermaking white water recycling system of this application; Figure 2 This paper presents a schematic diagram of the overall bottom axis structure of the multi-stage papermaking white water recycling system of this application; Figure 3 A schematic diagram of the outer tank axial structure of the multi-stage papermaking white water reuse system of this application is shown; Figure 4 A schematic diagram of the connection structure between the top frame and the support plate of the multi-stage papermaking white water recycling system of this application is shown; Figure 5 A schematic diagram of the inner tank axial structure of the multi-stage papermaking white water recycling system of this application is shown; Figure 6 This paper presents a schematic diagram of the connection structure between the air pipe and the solenoid valve in the multi-stage recycling system for papermaking white water of this application. Figure 7 This paper presents a schematic diagram showing the connection structure between the delivery pipe and the solenoid valve in the multi-stage papermaking white water recycling system of this application. Figure 8A schematic diagram of the connection structure of the rotating shaft, motor and transmission shaft of the multi-stage papermaking white water recycling system of this application is shown; Figure 9 A schematic diagram showing the disassembled structure of the rotating shaft, motor, and transmission shaft of the multi-stage white water recycling system for papermaking of this application is shown.

[0024] Figure label: 1. Outer tank; 101. Top outlet; 102. Bottom outlet; 103. Outer drain outlet; 104. Outer sludge outlet; 2. Sludge valve; 3. Top frame; 301. Movable hole; 4. Inner tank; 401. Ear plate; 402. Inner drain outlet; 403. Inner sludge outlet; 5. Hydraulic cylinder; 6. Support plate; 7. Air pipe; 701. Aeration head; 8. Solenoid air valve; 9. Delivery pipe; 901. Drip vertical pipe; 10. Solenoid liquid valve; 11. Rotating shaft; 1101. Impeller; 1102. Spline groove; 12. Motor; 13. Drive shaft; 1301. Spline head; 14. Guide inclined pipe. Detailed Implementation

[0025] 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, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please refer to Figures 1 to 9 Example 1: This invention proposes a multi-stage white water recycling system for papermaking, comprising: an outer tank 1, a drain valve 2, a top frame 3, an inner tank 4, hydraulic cylinders 5, support plates 6, air pipes 7, electromagnetic air valves 8, conveying pipes 9, electromagnetic liquid valves 10, a rotating shaft 11, a motor 12, a transmission shaft 13, and a guide pipe 14; a drain valve 2 is installed on the outside of the outer tank 1, and a top frame 3 is fixedly connected to the top of the outer tank 1; the inner tank 4 is connected inside the outer tank 1, and hydraulic cylinders 5 are installed on both sides of the outer tank 1, with the hydraulic cylinders 5 connected to the inner tank 4; a support plate 6 is fixedly connected to the top of the top frame 3, and an air pipe 7 is installed inside the inner tank 4, with an electromagnetic air valve 8 connected to the end of the air pipe 7; a conveying pipe 9 is fixedly connected to the top of the top frame 3, located between the top frame 3 and the support plate 6, with an electromagnetic liquid valve 10 connected to the end of the conveying pipe 9; the inner tank 4 is internally connected to... A rotating shaft 11 is connected to the inner tank 4. A motor 12 is fixedly installed on the top of the support plate 6. A transmission shaft 13 is rotatably connected inside the support plate 6. The drive shaft of the motor 12 is connected to the top of the transmission shaft 13, and the bottom of the transmission shaft 13 is connected to the top of the rotating shaft 11. Flow guide pipes 14 are installed on both sides of the outer tank 1. An aeration head 701 is set at the bottom of the air pipe 7. The aeration head 701 is located inside the bottom of the inner tank 4. The distance between the aeration head 701 and the bottom of the tank is 20 cm. The air pipe 7 is connected to the air supply equipment through an electromagnetic air valve 8. When the electromagnetic air valve 8 is opened, the air supplied is refined through the aeration head 701 and discharged into the papermaking white water inside the inner tank 4, providing the necessary oxygen for aerobic microorganisms, enabling them to decompose the dissolved organic matter in the white water and convert it into carbon dioxide and water, thereby reducing the chemical oxygen demand and biochemical oxygen demand.

[0027] In this embodiment, the rotating shaft 11 is rotatably connected to the inner pool 4, and an impeller 1101 is provided on the outside of the rotating shaft 11. The motor 12 is connected to the rotating shaft 11 through the transmission shaft 13. Using the above technical solution, during the aeration process, the motor 12 drives the rotating shaft 11 to rotate through the transmission shaft 13. The rotating impeller 1101 stirs the papermaking white water inside the inner tank 4, which can reduce the size of the bubbles, increase the number of bubbles, improve the degree of liquid turbulence, and prolong the contact time between the bubbles and the water, thereby accelerating the transfer of oxygen from the gas phase to the liquid phase. Stirring makes the dissolved oxygen concentration evenly distributed, avoids local hypoxia, and ensures that aerobic microorganisms efficiently degrade organic matter.

[0028] In this embodiment, a dripping vertical pipe 901 is provided at the bottom of the conveying pipe 9. The dripping vertical pipe 901 is located above the inner pool 4. The conveying pipe 9 is connected to the flocculant supply equipment through the electromagnetic liquid valve 10. Using the above technical solution, after the air flotation operation of the papermaking white water is completed, the electromagnetic liquid valve 10 is opened, and the flocculant is dripped into the papermaking white water inside the inner tank 4 through the dripping vertical pipe 901. The motor 12 continuously drives the rotating shaft 11 to rotate, and the impeller 1101 is used to efficiently stir the papermaking white water, so that the papermaking white water and flocculant are fully mixed. After the impeller 1101 stops running, the suspended solids, colloids and some dissolved substances in the water aggregate into larger flocs, and then achieve solid-liquid separation through gravity sedimentation, forming a sludge layer at the bottom of the inner tank 4.

[0029] In this embodiment, the outer side of the inner pool 4 is in sliding contact with the inner side of the outer pool 1. The top two ends of the inner pool 4 are provided with ear plates 401, and the top frame 3 is provided with movable holes 301 at both ends. The ear plates 401 are slidably connected in the movable holes 301. The cylinder body of the hydraulic cylinder 5 is fixedly connected to the inner pool 4, and the piston rod end of the hydraulic cylinder 5 is fixedly connected to the ear plates 401. Using the above technical solution, the inner pool 4 is limited to move up and down by sliding cooperation between the ear plate 401 and the movable hole 301. The hydraulic cylinder 5 applies a thrust to the inner pool 4, thereby driving the inner pool 4 to rise and fall.

[0030] In this embodiment, top drain outlets 101 are provided on the top of both sides of the outer pool 1, bottom drain outlets 102 are provided on the bottom of both sides of the outer pool 1, the guide pipe 14 is inclined, one end of the guide pipe 14 is connected to the top drain outlet 101, and the other end of the guide pipe 14 is connected to the bottom drain outlet 102, the bottom of the outer pool 1 is provided with an outer drain outlet 103, the outer drain outlet 103 is connected to the recycling pipeline, and the inner pool 4 is provided with inner drain outlets 402 on both sides, the distance between the inner drain outlet 402 and the bottom of the pool is 20 cm, and the inner drain outlet 402 is connected to the top drain outlet 101; Using the above technical solution, after the papermaking white water flocculation and sedimentation operation is completed, the hydraulic cylinder 5 drives the inner tank 4 to the top. At this time, the inner drain outlet 402 is connected to the top drain outlet 101. The papermaking white water purified inside the inner tank 4 flows into the outer tank 1 through the guide pipe 14, and then is discharged into the recycling pipeline through the outer drain outlet 103, realizing the recycling of papermaking white water, significantly improving water resource utilization efficiency, and reducing wastewater discharge.

[0031] In this embodiment, a spline groove 1102 is provided at the top of the rotating shaft 11, and a spline head 1301 is provided at the bottom of the transmission shaft 13. The spline head 1301 is slidably connected in the spline groove 1102. By adopting the above technical solution, when the hydraulic cylinder 5 drives the inner pool 4 to move up and down, the spline head 1301 slides in the spline groove 1102, ensuring the transmission effect of the rotating shaft 11.

[0032] Example 2: Based on Example 1, the bottom of the outer pool 1 is provided with a sewage outlet 104, the bottom of the inner pool 4 is provided with a sewage outlet 403, the sewage outlet 403 is connected to the sewage outlet 104, and the sewage outlet 104 is connected to the sewage valve 2. Using the above technical solution, when the sludge layer at the bottom of the inner pool 4 is thicker than 10 cm, the hydraulic cylinder 5 drives the inner pool 4 to fall to the bottom. At this time, the sewage outlet 104 is connected to the sewage valve 2. The sewage valve 2 is opened, and the sludge is suspended and discharged with the water flow through the sewage valve 2 by high pressure flushing. The operation is simple.

[0033] The working principle of this embodiment is as follows: First, papermaking white water is introduced into the inner tank 4. The electromagnetic valve 8 is opened, and the supplied air is aerated through the aeration head 701 and discharged into the papermaking white water inside the inner tank 4, providing the necessary oxygen for aerobic microorganisms. This enables them to decompose the dissolved organic matter in the white water, converting it into carbon dioxide and water, thereby reducing the chemical oxygen demand (COD) and biochemical oxygen demand (BOD). During the aeration process, the motor 12 drives the rotating shaft 11 to rotate through the transmission shaft 13, and the rotating impeller 1101 stirs the papermaking white water inside the inner tank 4. This process reduces bubble size, increases bubble quantity, enhances liquid turbulence, and prolongs the contact time between bubbles and water, thereby accelerating oxygen transfer from the gas phase to the liquid phase. Stirring ensures a uniform distribution of dissolved oxygen concentration, preventing localized hypoxia and guaranteeing efficient degradation of organic matter by aerobic microorganisms. After the papermaking white water flotation operation is completed, the electromagnetic liquid valve 10 opens, and flocculant drips into the papermaking white water inside the inner tank 4 through the dripping vertical pipe 901. The motor 12 continuously drives the rotating shaft 11 to rotate, utilizing the impeller 1101 to efficiently stir the papermaking white water, making the... After the papermaking white water and flocculant are thoroughly mixed, and the impeller 1101 stops operating, the suspended solids, colloids, and some dissolved substances in the water aggregate into larger flocs, which then achieve solid-liquid separation through gravity sedimentation, forming a sludge layer at the bottom of the inner tank 4. After the flocculation and sedimentation of the papermaking white water is completed, the hydraulic cylinder 5 lifts the inner tank 4 to its highest point. At this time, the inner drain outlet 402 is connected to the top drain outlet 101. The purified papermaking white water inside the inner tank 4 flows into the outer tank 1 through the guide pipe 14, and then is discharged into the recovery pipeline through the outer drain outlet 103. This system enables the recycling of white water from papermaking, significantly improving water resource utilization efficiency and reducing wastewater discharge. When the hydraulic cylinder 5 moves the inner pool 4 up and down, the spline head 1301 slides in the spline groove 1102, ensuring the transmission effect of the rotating shaft 11. When the sludge layer at the bottom of the inner pool 4 is thicker than 10 cm, the hydraulic cylinder 5 moves the inner pool 4 to the bottom. At this time, the sewage outlet 104 is connected to the sewage valve 2. The sewage valve 2 is opened, and the sludge is suspended and discharged with the water flow through the sewage valve 2 using a high-pressure flushing method. The operation is simple.

[0034] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0035] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0036] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-stage white water recycling system for papermaking, comprising: The outer pool (1), drain valve (2), top frame (3), inner pool (4), hydraulic cylinder (5), support plate (6), air pipe (7), solenoid air valve (8), delivery pipe (9), solenoid hydraulic valve (10), rotating shaft (11), motor (12), transmission shaft (13), and guide pipe (14) are characterized in that a drain valve (2) is installed on the outside of the outer pool (1), and a top frame (3) is fixedly connected to the top of the outer pool (1); an inner pool (4) is connected inside the outer pool (1), and hydraulic cylinders (5) are installed on both sides of the outer pool (1), with the hydraulic cylinders (5) connected to the inner pool (4); a support plate (6) is fixedly connected to the top of the top frame (3), and the inner pool (4) is connected to the inner pool (4). An air pipe (7) is installed inside the inner pool (4), and an electromagnetic air valve (8) is connected to the end of the air pipe (7); a conveying pipe (9) is fixedly connected to the top of the top frame (3), and the conveying pipe (9) is located between the top frame (3) and the support plate (6), and an electromagnetic liquid valve (10) is connected to the end of the conveying pipe (9); a rotating shaft (11) is connected inside the inner pool (4), a motor (12) is fixedly installed on the top of the support plate (6), a transmission shaft (13) is rotatably connected inside the support plate (6), the drive shaft of the motor (12) is connected to the top of the transmission shaft (13), and the bottom of the transmission shaft (13) is connected to the top of the rotating shaft (11); a guide pipe (14) is installed on both sides of the outer pool (1).

2. The multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The air pipe (7) is equipped with an aeration head (701) at the bottom. The aeration head (701) is located inside the bottom of the inner pool (4). The distance between the aeration head (701) and the bottom of the pool is 20 cm. The air pipe (7) is connected to the air supply equipment through an electromagnetic air valve (8).

3. The multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The rotating shaft (11) is rotatably connected to the inner pool (4), and an impeller (1101) is provided on the outside of the rotating shaft (11). The motor (12) is connected to the rotating shaft (11) through the transmission shaft (13).

4. A multi-stage papermaking white water reuse system according to claim 1, characterized in that, The bottom of the delivery pipe (9) is provided with a dripping vertical pipe (901), which is located above the inner pool (4). The delivery pipe (9) is connected to the flocculant supply equipment through the electromagnetic liquid valve (10).

5. A multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The outer side of the inner pool (4) is in sliding contact with the inner side of the outer pool (1). The top two ends of the inner pool (4) are provided with ear plates (401), and the top frame (3) is provided with movable holes (301) at both ends. The ear plates (401) are slidably connected in the movable holes (301).

6. A multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The cylinder body of the hydraulic cylinder (5) is fixedly connected to the inner pool (4), and the piston rod end of the hydraulic cylinder (5) is fixedly connected to the ear plate (401).

7. A multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The outer pool (1) has a top outlet (101) on both sides and a bottom outlet (102) on both sides. The guide pipe (14) is inclined, with one end of the guide pipe (14) connected to the top outlet (101) and the other end of the guide pipe (14) connected to the bottom outlet (102).

8. A multi-stage white water recycling system for papermaking according to claim 7, characterized in that, The outer pool (1) is provided with a drain outlet (103) at the bottom, which is connected to the recycling pipeline. The inner pool (4) is provided with drain outlets (402) on both sides. The drain outlets (402) are 20 cm away from the bottom of the pool and are connected to the top drain outlet (101).

9. A multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The top of the rotating shaft (11) is provided with a spline groove (1102), and the bottom of the transmission shaft (13) is provided with a spline head (1301), which is slidably connected in the spline groove (1102).

10. A multi-stage white water recycling system for papermaking according to claim 1, characterized in that, The outer pool (1) is provided with a sewage outlet (104) at the bottom, and the inner pool (4) is provided with a sewage outlet (403) at the bottom. The sewage outlet (403) and the sewage outlet (104) are connected to the sewage valve (2).

Images