A papermaking wastewater sludge collecting device and a sludge collecting method

Abstract

This invention relates to the field of industrial papermaking wastewater treatment technology, and discloses a papermaking wastewater pulp collection device and method. The pulp collection device includes a water distribution device, an inclined screen device, a cooling device, a backwashing device, an effluent collection device, and a pulp collection device. The water distribution device has a flow-rectifying structure inside and effluent weirs on both sides. The inclined screen devices are respectively arranged on both sides of the water distribution device and connected to the effluent weirs. The cooling devices are respectively located below the inclined screen devices. The backwashing devices are located between the cooling devices and the inclined screen devices, respectively located on the bottom and top sides of the lower horizontal end of the inclined screen devices. This invention significantly reduces the footprint compared to traditional water distribution channels, and has high water distribution efficiency. It has a filtered water cooling function, reducing water mist in the workshop and facilitating subsequent biological treatment of the filtered water. The backwashing device improves the cleaning effect of the inclined screen device and reduces the moisture content of the filtered pulp.

Description

Technical Field

[0001] This invention relates to the field of industrial papermaking wastewater treatment technology, and discloses a papermaking wastewater collection device and a collection method using this device. Background Technology

[0002] In the treatment of pulp and paper wastewater, the inclined screen filtration unit serves as a key filtration unit, undertaking the dual functions of recovering pulp fibers and removing suspended solids from the wastewater. Existing technologies often employ open-channel water distribution, which presents the following technical problems: Open channels use wide concrete channels for water distribution, resulting in low distribution efficiency, water flow velocities below 0.3 m / s, and a tendency for settling and clogging. The effective usable volume decreases rapidly within 30 days, and the load distribution at the effluent weir is uneven. Open channels also have low space utilization, with the filtered water collection tank accounting for over 40% of the total treatment area, and high civil engineering costs and long on-site construction periods. Fixed screens used in conjunction with open channels suffer from uneven water distribution and easy clogging, leading to higher moisture content in the recovered pulp. Manual backwashing to address screen clogging is inefficient, labor-intensive, and yields poor washing results.

[0003] In addition, the high temperature of pulp and paper wastewater and the presence of water mist and equipment corrosion in the inclined screen filtration operation room, with water mist concentrations reaching 5000 mg / m³, contribute to the problem. 3 This exacerbates equipment and plant corrosion, leads to prolonged worker stays, creates a harsh operating environment, and poses significant occupational health risks. The extensive operating environment results in ineffective collection of hot and humid exhaust gases, and the screen-and-water distribution structure fails to fully utilize heat dissipation from the raw water, or causes it to be excessively cooled, impacting the efficiency of subsequent biological treatment. In existing technologies, wastewater cooling and inclined screen filtration are separate units, requiring large investments and significant land area.

[0004] In summary, existing technologies suffer from several problems: low efficiency of water distribution systems and high filtration water content due to easy clogging of screens; high wastewater temperature and high water mist concentration leading to equipment corrosion and deterioration of the operating environment; and large space occupation and long construction period of collection tanks. Summary of the Invention

[0005] To address the problems of low efficiency, large space occupation of collection tanks, and long construction period in existing water distribution systems, as well as the problems of equipment corrosion and environmental degradation caused by high wastewater temperature and water mist, this invention provides a papermaking wastewater collection device. It has the function of cooling and heat dissipation of filtered water, adopts a small-volume water distribution device with rectification structure, has high water distribution efficiency and is not prone to sedimentation and clogging, and the filter screen is easy to replace and has a backwashing function.

[0006] To achieve the above-mentioned technical effects, the present invention provides the following technical solution: A papermaking wastewater collection device, comprising: A water distribution device, wherein a flow straightening structure is provided inside the water distribution device and water outlet weirs are provided on both sides; Inclined mesh devices are respectively arranged on both sides of the water distribution device and connected to the water outlet weir; Cooling devices are respectively disposed below the inclined mesh device; A reverse flushing device is disposed between the cooling device and the inclined screen device; The effluent collection device and the slurry collection device are respectively located on the bottom side and the top side of the lower horizontal end of the inclined screen device.

[0007] The water distribution device in this invention is used to introduce papermaking wastewater. The wastewater overflows evenly through weirs on both sides and flows to the inclined screen devices on both sides. The water distribution device has an internal rectifying structure to rectify and evenly distribute the wastewater entering the device, guiding it from bottom to top and maintaining a stable flow to prevent sedimentation and clogging. The inclined screen devices are used to filter fibrous impurities from the wastewater. The filtered water flows along the lower side of the inclined screen device to the lower outlet collection device, while the filtered fiber pulp slides down the upper surface of the inclined screen device and is collected by the pulp collection device. A cooling device introduces outside air to cool the filtered water on the lower side of the inclined screen device.

[0008] The water distribution device includes a water tank with symmetrical water inlets on both sides. The flow rectification structure includes a baffle plate and a baffle plate, which are fixedly connected and arranged along the length of the water tank, located in the middle of the tank. The water inlets are located on the concave side of the baffle plate. The opposing water inlets create convection, preventing fibrous impurities in the wastewater from settling at the bottom of the water tank. The baffle plate and baffle plate rectify the wastewater in the water tank twice, forming a stable and rising water surface in the water tank, ensuring the water distribution effect of the subsequent outlet weir. By reducing the cross-sectional area of ​​the water distribution channel, using water inlets at both ends, and adding baffle plates and baffle plates, the wastewater is guided to move from bottom to top and the water flow is kept stable, avoiding sedimentation and clogging.

[0009] The baffle plate has a symmetrical curved surface structure with its concave surface facing the bottom of the water tank. Its top is fixedly connected to the spacer baffle, and the two ends of the baffle plate have flow gaps with the bottom of the water tank. Wastewater enters the space between the concave surface of the baffle plate and the bottom surface of the water tank through the inlet, undergoes initial rectification by the baffle plate, and flows out through the flow gaps.

[0010] The baffles comprise several groups and are arranged at intervals within the water tank. One or more groups of baffles can be provided; when multiple groups are provided, the baffles are connected to the same spacer baffle. The spacing between the baffles facilitates the flow of wastewater from the concave inner surface to the convex outer surface of the baffles.

[0011] The outlet weir is equipped with a water-retaining band, which is arranged along the length of the outlet weir. The water-retaining band slows down and evenly distributes the wastewater in the tank, ensuring that the wastewater entering the inclined screen device flows in a consistent direction, thus achieving uniform water distribution.

[0012] The inclined screen device includes a frame and a filter screen detachably connected inside the frame, with several transverse baffles arranged at intervals within the frame. The transverse baffles optimize water flow distribution.

[0013] The cooling device includes a louvered baffle disposed below the inclined screen device. The louvers of the baffle are tilted in the same direction as the inclined screen device, and the horizontal tilt angle of the louvers is greater than or equal to the horizontal tilt angle of the inclined screen device. The tilt angle of the inclined screen device is 30°~60°, and the tilt angle of the louvered baffle is 30°~60°. The cooling device introduces outside air to cool and dissipate heat from the filtered water on the lower side of the inclined screen device. Some of the filtered water drips into the cooling device and is collected by the cooling device to the outlet water collection device.

[0014] The reverse flushing device has several spray nozzles evenly distributed along the width direction of the inclined screen device. The reverse water discharge device is used to clean the fiber pulp retained on the inclined screen device.

[0015] The slurry collection device includes a wet slurry guide plate and a belt conveyor. One end of the wet slurry guide plate is connected to the lower horizontal end of the inclined screen device. The wet slurry guide plate has an inclination angle of 30° to 45°. The belt conveyor is located at the lower horizontal end of the wet slurry guide plate and is equipped with a filter screen belt. The inclination angle of the wet slurry guide plate (30° to 45°) eliminates the influence of changes in the wet slurry volume on the belt conveyor.

[0016] An exhaust fan is installed in the gap between the louvered baffle and the inclined mesh device. The exhaust fan creates negative pressure at both ends of the gap between the louvered baffle and the inclined mesh device, accelerating the discharge of hot and humid gas.

[0017] On the other hand, the present invention provides a method for collecting papermaking wastewater using the above-mentioned papermaking wastewater collection device, comprising the following steps: Step 1: Wastewater enters through the inlets on both sides of the water distribution device and overflows through the outlet weirs on both sides of the water distribution device. Step 2: The wastewater overflowing from the outlet weir is filtered by the inclined screen device. The filtered water flows along the lower surface of the inclined screen device to the outlet collection device, and the filtered slurry flows along the upper surface of the inclined screen device to the slurry collection device. The cooling device cools and dissipates heat from the filtered water. Step 3: The filtered water is collected by the effluent collection device, and the filtered slurry is collected by the slurry collection device and transported out.

[0018] In step one, the wastewater entering the water distribution device is rectified and evenly distributed by the rectifier structure, guiding the wastewater to move from bottom to top and maintaining a stable flow. The wastewater overflows from the outlet weir and flows from top to bottom along the upper surface of the inclined screen device. In step two, the fibers in the wastewater are trapped by the inclined screen device and roll down to the slurry collection device under the action of the incoming water and gravity. The filtered water flows through the filter screen and along the lower surface of the inclined screen device to the outlet collection device. The cooling device intakes air to cool and dissipate heat from the filtered water.

[0019] The present invention produces the following beneficial effects: 1. The device of this invention has a small overall footprint, and the various components can be quickly assembled on-site, shortening the construction cycle; 2. The internal rectification structure of the water distribution device can achieve rapid and uniform distribution of wastewater, with high water distribution efficiency; 3. The cooling device realizes the function of cooling the filtered water, which is conducive to the subsequent biological treatment of the filtered water and reduces the concentration of water mist in the workshop; 4. Reduces secondary cooling energy consumption; 5. Improves the working environment for workers; 6. Reduces the frequency and cost of operation and maintenance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention in Embodiment 1.

[0021] Figure 2 This is a front view of the device of the present invention in Embodiment 1.

[0022] Figure 3 This is a schematic diagram of the inclined wire mesh device in Embodiment 1.

[0023] Figure 4 for Figure 3 Cross-sectional view at point AA.

[0024] Figure 5 This is a schematic diagram of the arrangement of the baffles in the water tank in Example 3.

[0025] Icon labels: 1. Water distribution device; 11. Water outlet weir; 111. Water baffle; 12. Water tank; 13. Water inlet; 14. Spacing baffle; 15. Baffle plate; 16. Flow gap; 2. Inclined screen device; 21. Frame; 22. Filter screen; 23. Horizontal water baffle; 24. Horizontal pressure strip; 25. Longitudinal pressure strip; 3. Cooling device; 31. Louvered baffle; 4. Water collection device; 5. Slurry collection device; 51. Wet slurry guide plate; 52. Belt conveyor; 6. Reverse water outlet device; 61. Spray nozzle. Detailed Implementation

[0026] The following detailed description of the specific structure, working principle, and beneficial effects of the technical solution of the present invention, based on specific embodiments, is provided below.

[0027] Example 1 This embodiment provides a papermaking wastewater pulp collection device, which is referenced from... Figures 1 to 4 The system mainly includes a water distribution device 1, an inclined screen device 2, a cooling device 3, an effluent collection device 4, a slurry collection device 5, and a backwashing device 6. The water distribution device 1 is a long, narrow water tank structure made of stainless steel, offering excellent corrosion resistance. An internal flow-rectifying structure is incorporated into the water distribution device 1, with effluent weirs 11 on both sides extending along its length to ensure even wastewater overflow. The inclined screen devices 2 are positioned on both sides of the water distribution device 1, directly opposite the effluent weirs 11, allowing wastewater overflowing from the weirs to flow directly onto the filter surface of the inclined screen devices 2.

[0028] In this embodiment, reference Figure 2 The water distribution device 1 includes a water tank 12, and the flow rectification structure includes a baffle 14 and a baffle 15. The baffle 14 and the baffle 15 are fixedly connected together and are arranged along the length of the water tank 12, located in the middle of the water tank 12. The baffle 15 has a symmetrical curved surface structure, with its concave surface facing the bottom of the water tank 12. The top of the baffle 15 is fixedly connected to the baffle 14, and a flow gap 16 is formed between the edges of both ends of the baffle 15 and the bottom of the water tank 12. Water inlets 13 are symmetrically provided on both sides of the water tank 12, and the water inlets 13 are located on the concave surface side of the baffle 15.

[0029] The water distribution device 1 is made of stainless steel, replacing the traditional concrete water channel structure, reducing the pool volume, lowering costs and construction difficulty.

[0030] When wastewater enters the water tank 12 through the inlets 13 on both sides of the water tank 12, the two streams of water flowing in opposite directions create a continuous disturbance to the wastewater in the water tank 12, preventing the filter material in the wastewater from settling at the bottom of the water tank 12.

[0031] The baffle 15 has a symmetrical curved surface structure and is positioned in the middle of the water tank 12 along its length. The two sides of the baffle 15 form flow gaps with the bottom of the water tank 12. Thus, wastewater entering through the inlet 13 collects in the space between the recess of the baffle 15 and the bottom surface of the water tank 12 and is rectified by the baffle 15, achieving initial uniform distribution. The wastewater then flows out through the two flow gaps and reaches the convex side of the baffle 15. Subsequently, the wastewater is slowed down by the convex surface of the baffle 15 and the spacer baffle 14, forming a stable, rising water surface. The wastewater then flows out through these gaps to facilitate control of the outflow direction.

[0032] In this embodiment, reference Figure 1The outlet weir 11 is equipped with a water-retaining strip 111, which is arranged along the length of the outlet weir 11 and has a height of 100mm to 200mm. The water-retaining strip 111 can automatically adjust the overflow angle according to the water level to ensure that the wastewater overflows evenly from the outlet weir 11 and avoids situations where the flow rate is too high or too low in some areas. The water-retaining strip 111 is made of PP material.

[0033] In this embodiment, reference Figure 3 and 4 The inclined screen device 2 includes a frame 21 and a filter screen 22 detachably connected inside the frame 21. The mesh size of the filter screen 22 is determined according to the fiber particle size in the actual wastewater; in this embodiment, a 60-mesh nylon filter screen is preferably used. The inclined screen device 2 is arranged at an angle, with its higher horizontal end connected to the effluent weir 11 and its lower horizontal end extending above the slurry collection device 5. After overflowing from the effluent weir 11, the wastewater flows from top to bottom along the upper surface of the inclined screen device 2, completing solid-liquid separation under the action of gravity.

[0034] The frame 21 is made of aluminum alloy, which has higher corrosion resistance than traditional steel, thus extending the service life of the equipment.

[0035] In this embodiment, the frame 21 is rectangular, with horizontal pressure strips 24 and vertical pressure strips 25 bolted around its upper side, fixing the filter screen 22 in place. Two water-blocking plates 23 are positioned in the middle of the filter screen 22, and these plates are either fixedly connected to the vertical pressure strips 25 or integrally formed. The horizontal water-blocking plates 23 are spaced apart within the frame 21 to prevent the water flow from gradually increasing and reducing the filtration effect during the inclined screen filtration process. Simultaneously, the horizontal water-blocking plates 23 provide water distribution. In this embodiment, the water-blocking plate 23 has a right-angled triangular cross-section, with one of its angled sides pressed against the surface of the filter screen 22 along with the vertical pressure strip 25, the angled side facing the direction of the filtered slurry's fall.

[0036] In this embodiment, the cooling device 3 is disposed below the inclined screen device 2. The cooling device 3 includes a louvered baffle 31 disposed below the inclined screen device 2. The louvered baffle 31 has an opening ratio of 50%~70%, and the louvers of the louvered baffle 31 are tilted in the same direction as the inclined screen device 2, with the horizontal tilt angle of the louvers greater than or equal to the horizontal tilt angle of the inclined screen device 2. Specifically, the horizontal tilt angle of the inclined screen device 2 is 45°~60°, and the horizontal tilt angle of the louvers is 15°~25°. This angled design allows some of the filtered water dripping onto the blades to be collected layer by layer and flow into the outlet water collection device when the filtered water flows down the lower surface of the inclined screen device 2. Simultaneously, this process increases the contact area between the filtered water and the air, effectively improving the cooling efficiency. The louvered baffle 31 is made of a metal material with good thermal conductivity, further enhancing the heat dissipation effect.

[0037] A water collection device 4 is located on the bottom side of the lower horizontal end of the inclined screen device 2, and is used to collect the filtered water that has been cooled and collected by the louvered baffle 31. A slurry collection device 5 is located on the top side of the lower horizontal end of the inclined screen device 2, and is used to collect the fiber slurry trapped by the inclined screen device 2. The slurry collection device 5 includes a wet slurry guide plate 51 and a belt conveyor 52. The surface of the wet slurry guide plate 51 is polished, and one end is connected to the lower horizontal end of the inclined screen device 2. The inclined angle of the wet slurry guide plate 51 is 45°~60°, so that the fiber slurry sliding down the upper surface of the inclined screen device 2 can continue to slide down the wet slurry guide plate 51. The belt conveyor 52 is located at the lower horizontal end of the wet slurry guide plate 51, and is used to transport the collected fiber slurry out.

[0038] The belt conveyor 52 is equipped with a filter belt to prevent tensile deformation. The filter belt is a steel-reinforced nylon mesh belt with an elongation of ≤0.5%, tensile strength ≥800N / cm, and a mesh size of 30~60 mesh. The belt conveyor 52's electric roller integrates a scraper and a water spray roller cleaner to achieve self-cleaning of the belt.

[0039] A reverse flushing device 6 is positioned between the louvered baffle 31 and the inclined screen device 2. The reverse flushing device 6 has several spray nozzles 61 evenly distributed along the width of the inclined screen device 2, with the water outlets of the nozzles 61 facing the lower surface of the inclined screen device 2. The reverse flushing device 6 is connected to an external water source via a pipe equipped with a control valve and a pressure regulating device. When the filter screen 22 needs cleaning, the reverse flushing device 6 is activated, and high-pressure water is sprayed from the nozzles 61, impacting the lower surface of the filter screen 22 from bottom to top, washing away the fibers and impurities clogging the mesh of the filter screen 22, restoring the filtration capacity of the filter screen 22. The reverse flushing device 6 can be automatically activated periodically or manually activated depending on the degree of clogging of the filter screen 22.

[0040] In this embodiment, the reverse flushing device 6 is a water pipe inserted between the inclined mesh device 2 and the cooling device 3, and a plurality of spray nozzles 61 spaced apart on the pipe. The pipe is connected to an external pressurized water source. In this embodiment, the spray nozzles 61 are fan-shaped nozzles. The spray nozzles 61 are perpendicular to the filter screen 22 or at a certain angle; in this embodiment, they are arranged perpendicularly. The reverse flushing device 6 reciprocates along the length of the inclined mesh device 2, and the flushing range covers the entire inclined mesh device. The reciprocating frequency of the reverse flushing device 6 is 0.5 to 2 times per hour.

[0041] This embodiment also provides a pulping method using the above-mentioned papermaking wastewater pulping device, including the following steps: Step 1: Wastewater enters through the inlets 13 on both sides of the water distribution device 1 and overflows through the outlet weirs 11 on both sides of the water distribution device 1. Step 2: The wastewater overflowing from the outlet weir 11 is filtered by the inclined screen device 2. The filtered water flows along the lower surface of the inclined screen device 2 to the outlet collection device 4, and the filtered slurry flows along the upper surface of the inclined screen device 2 to the slurry collection device 5. The cooling device 3 cools and dissipates heat from the filtered water. Step 3: The filtered slurry is collected by the slurry collection device 5 and transported out.

[0042] In this process, the papermaking wastewater enters the water tank 12 through the inlet 13 on both sides of the water distribution device 1. After being buffered by the baffle 15 and stabilized by the baffle 14, it overflows evenly from the outlet weir 11 on both sides of the water distribution device 1.

[0043] Next, the wastewater overflows from the effluent weir 11 and is evenly distributed by the water-blocking belt 111. It then flows downwards along the upper surface of the inclined screen device 2. Fibers in the wastewater are trapped by the filter screen 22 and roll off under the influence of the incoming water and gravity. The filtered water then flows along the lower surface of the inclined screen device 2 to the effluent collection device 4 after passing through the filter screen 22.

[0044] During this process, the louvered baffle 31 of the cooling device 3 introduces air to cool and dissipate heat from the filtered water. Some of the dripping filtered water flows along the louvered baffle 31 to the outlet water collection device 4. The trapped fiber pulp continues to slide down the upper surface of the inclined wire mesh device 2 to the pulp collection device 5, where it is collected by the wet pulp guide plate 51 and then transported out by the belt conveyor 52.

[0045] The papermaking wastewater collection device in this embodiment is prefabricated in a factory and can be quickly assembled on-site, greatly improving construction efficiency and ensuring quality control. The integrated water distribution device reduces the cross-sectional area of ​​the distribution channel, uses water inlets at both ends and incorporates an internal flow-rectifying structure to guide the wastewater upwards and maintain a stable flow, preventing sedimentation and clogging. Water-retaining bands 111 are installed on both sides of the water tank's outlet weirs for secondary water distribution, creating a stable flow velocity and evenly covering the inclined mesh device. A cooling device cools the filtered water, reducing water mist in the workshop. The overall device occupies less space and has lower manufacturing costs compared to traditional concrete water channels.

[0046] Example 2 This embodiment further optimizes the technical solution based on Embodiment 1, and continues to refer to... Figure 1 and 2This embodiment provides a papermaking wastewater collection device, including a water distribution device 1, an inclined screen device 2, a cooling device 3, an effluent collection device 4, a pulp collection device 5, and a reverse flushing device 6. The water distribution device 1 is an elongated water tank structure made of stainless steel, providing excellent corrosion resistance. An internal rectifying structure is provided within the water distribution device 1, and effluent weirs 11 are located on both sides of the device, extending along its length to ensure uniform wastewater overflow. The inclined screen devices 2 are arranged on both sides of the water distribution device 1, corresponding to the effluent weirs 11, allowing wastewater overflowing from the weirs 11 to flow directly onto the filter surface of the inclined screen devices 2.

[0047] In this embodiment, the water distribution device 1 includes a water tank 12, with symmetrical water inlets 13 on both sides of the water tank 12. The flow rectification structure includes a baffle 14 and a baffle 15, which are fixedly connected. The baffle 14 and the baffle 15 are arranged along the length of the water tank 12 and are located in the middle of the water tank 12. The water inlets 13 are located on the concave side of the baffle 15. The baffle 15 has a symmetrical curved surface structure, with its concave surface facing the bottom of the water tank 12. Its top is fixedly connected to the baffle 14, and the edges of both ends of the baffle 15 have flow gaps 16 with the bottom of the water tank 12.

[0048] In this embodiment, the outlet weir 11 is provided with a water-blocking band 111, which is arranged along the length of the outlet weir 11.

[0049] In this embodiment, the inclined screen device 2 includes a frame 21 and a filter screen 22 detachably connected inside the frame 21, and a plurality of transverse water baffles 23 are arranged at intervals inside the frame 21.

[0050] In this embodiment, the cooling device 3 includes a louvered baffle 31 disposed below the inclined mesh device 2. The louvers of the louvered baffle 31 are tilted in the same direction as the inclined mesh device 2, and the horizontal tilt angle of the louvers is greater than or equal to the horizontal tilt angle of the inclined mesh device 2. An exhaust fan is disposed in the gap between the louvered baffle 31 and the inclined mesh device 2.

[0051] In this embodiment, the reverse flushing device 6 has a plurality of spray nozzles 61 evenly distributed along the width direction of the inclined net device 2.

[0052] In this embodiment, the slurry collection device 5 includes a wet slurry guide plate 51 and a belt conveyor 52. One end of the wet slurry guide plate 51 is connected to the lower horizontal end of the inclined screen device 2. The inclined angle of the wet slurry guide plate 51 is 30°~45°. The belt conveyor 52 is located at the lower horizontal end of the wet slurry guide plate 51. The belt conveyor 52 is equipped with a water filter belt.

[0053] In this embodiment, exhaust fans are installed at both ends of the gap between the louvered baffle 31 and the inclined mesh device 2, and the air volume of the exhaust fans is adjusted to 0.1~0.5m³ / h. 3 / s. Wastewater temperature is controlled by adjusting the exhaust fan volume: in summer, increasing the volume lowers the wastewater temperature by 3-8°C, while in winter, decreasing the volume keeps the wastewater warm, avoiding excessive cooling that could affect subsequent biological treatment.

[0054] Based on Embodiment 1, this embodiment adds a reverse flushing device, which can clean the filter screen without disassembling it. This significantly reduces downtime for equipment maintenance, improves equipment operating efficiency, and prevents filter screen blockage that leads to insufficient wastewater filtration and high water content in the filter slurry.

[0055] Example 3 This embodiment further optimizes the technical solution based on Embodiment 1, and continues to refer to... Figure 1 and 2 This embodiment provides a papermaking wastewater collection device, including a water distribution device 1, an inclined screen device 2, a cooling device 3, an effluent collection device 4, and a pulp collection device 5. The water distribution device 1 is an elongated water tank structure made of stainless steel, providing excellent corrosion resistance. An internal rectifying structure is installed in the water distribution device 1, and effluent weirs 11 are located on both sides of the device, extending along its length to ensure uniform wastewater overflow. The inclined screen devices 2 are arranged on both sides of the water distribution device 1, corresponding to the effluent weirs 11, allowing wastewater overflowing from the weirs 11 to flow directly onto the filter surface of the inclined screen devices 2.

[0056] In this embodiment, the water distribution device 1 includes a water tank 12, with symmetrical water inlets 13 on both sides of the water tank 12. The flow rectification structure includes a baffle 14 and a baffle 15, which are fixedly connected. The baffle 14 and the baffle 15 are arranged along the length of the water tank 12 and are located in the middle of the water tank 12. The water inlets 13 are located on the concave side of the baffle 15. The baffle 15 has a symmetrical curved surface structure, with its concave surface facing the bottom of the water tank 12. Its top is fixedly connected to the baffle 14, and the edges of both ends of the baffle 15 have flow gaps 16 with the bottom of the water tank 12.

[0057] In this embodiment, the outlet weir 11 is provided with a water-blocking band 111, which is arranged along the length of the outlet weir 11.

[0058] In this embodiment, the inclined screen device 2 includes a frame 21 and a filter screen 22 detachably connected inside the frame 21, and a plurality of transverse water baffles 23 are arranged at intervals inside the frame 21.

[0059] In this embodiment, the cooling device 3 includes a louvered baffle 31 disposed below the inclined mesh device 2. The louvered baffle 31 has the same tilting direction as the inclined mesh device 2, and the horizontal tilting angle of the louvered baffle 31 is greater than or equal to the horizontal tilting angle of the inclined mesh device 2.

[0060] In this embodiment, the reverse flushing device 6 has a plurality of spray nozzles 61 evenly distributed along the width direction of the inclined net device 2.

[0061] In this embodiment, the slurry collection device 5 includes a wet slurry guide plate 51 and a belt conveyor 52. One end of the wet slurry guide plate 51 is connected to the lower horizontal end of the inclined screen device 2. The inclined angle of the wet slurry guide plate 51 is 30°~45°. The belt conveyor 52 is located at the lower horizontal end of the wet slurry guide plate 51. The belt conveyor 52 is equipped with a water filter belt.

[0062] Unlike Example 1, the reference is Figure 5 In this embodiment, the flow rectification structure employs three sets of spaced-apart baffles 15. The three sets of baffles 15 are arranged at equal intervals along the length of the water tank 12, and are connected to the same spacer baffle 14. Thus, the gap between two adjacent baffles 15 provides a flow channel for the wastewater in the wastewater tank, facilitating the flow of wastewater from the concave surface to the convex surface of the baffle 15.

Claims

1. A papermaking wastewater collection device, characterized in that, include: Water distribution device (1), the water distribution device (1) is provided with a flow rectification structure inside and water outlet weirs (11) are provided on both sides; Inclined net devices (2) are respectively arranged on both sides of the water distribution device (1) and connected to the water outlet weir (11); Cooling device (3), the cooling device (3) is respectively arranged below the inclined mesh device (2); A reverse flushing device (6) is disposed between the cooling device (3) and the inclined screen device (2); The water collection device (4) and the slurry collection device (5) are respectively located on the bottom side and the top side of the lower horizontal end of the inclined screen device (2).

2. The papermaking wastewater collection device according to claim 1, characterized in that, The water distribution device (1) includes a water tank (12), and water inlets (13) are symmetrically provided on both sides of the water tank (12). The flow rectification structure includes a baffle (14) and a baffle (15). The baffle (14) and the baffle (15) are fixedly connected. The baffle (15) and the baffle (14) are arranged along the length of the water tank (12) and are located in the middle of the water tank (12). The water inlet (13) is located on the concave side of the baffle (15).

3. The papermaking wastewater collection device according to claim 2, characterized in that, The baffle (15) is a symmetrical curved structure with its concave surface facing the bottom of the water tank (12). Its top is fixedly connected to the spacer baffle (14). The two ends of the baffle (15) have a flow gap (16) with the bottom of the water tank (12).

4. A papermaking wastewater collection device according to any one of claims 2 or 3, characterized in that, The baffles (15) comprise several groups and are spaced apart within the water tank (12).

5. The papermaking wastewater collection device according to claim 1, characterized in that, The outlet weir (11) is provided with a water-blocking belt (111), which is arranged along the length of the outlet weir (11).

6. The papermaking wastewater collection device according to claim 1, characterized in that, The inclined screen device (2) includes a frame (21) and a filter screen (22) detachably connected inside the frame (21), with a number of transverse baffles (23) arranged at intervals inside the frame (21).

7. A papermaking wastewater collection device according to claim 5, characterized in that, The cooling device (3) includes a louvered baffle (31) disposed below the inclined mesh device (2). The louvered baffle (31) has the same tilting direction as the inclined mesh device (2), and the horizontal tilting angle of the louver is greater than or equal to the horizontal tilting angle of the inclined mesh device (2). An exhaust fan is provided in the gap between the louvered baffle (31) and the inclined mesh device (2).

8. A papermaking wastewater collection device according to claim 1, characterized in that, The reverse flushing device (6) has a plurality of spray nozzles (61) evenly distributed along the width direction of the inclined net device (2).

9. A papermaking wastewater collection device according to claim 1, characterized in that, The slurry collection device (5) includes a wet slurry guide plate (51) and a belt conveyor (52). One end of the wet slurry guide plate (51) is connected to the lower horizontal end of the inclined screen device (2). The wet slurry guide plate (51) has an inclination angle of 30°~45°. The belt conveyor (52) is located at the lower horizontal end of the wet slurry guide plate (51). The belt conveyor (52) is equipped with a filter screen belt.

10. A method for collecting papermaking wastewater, using the papermaking wastewater collection apparatus according to any one of claims 1 to 9, comprising the following steps: Step 1: Wastewater enters through the inlets (13) on both sides of the water distribution device (1) and overflows through the outlet weirs (11) on both sides of the water distribution device (1); Step 2: The wastewater overflowing from the outlet weir (11) is filtered by the inclined screen device (2). The filtered water flows along the lower surface of the inclined screen device (2) to the outlet collection device (4), and the filtered slurry flows along the upper surface of the inclined screen device (2) to the slurry collection device (5). The cooling device (3) cools and dissipates heat from the filtered water. Step 3: The filtered water is collected by the water collection device (4), and the filtered slurry is collected by the slurry collection device (5) and transported out.

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