A white water multi-stage treatment system

Abstract

The utility model relates to a kind of white water multistage processing system, including white water pool, steam floating device, fiber recovery pipeline and clear water recovery pipeline.The outlet of white water pool is connected with steam floating device, and the suspended solids outlet of steam floating device is connected with fiber recovery pipeline, and the liquid outlet of steam floating device is connected with clear water recovery pipeline.Fiber recovery pipeline includes recovery pulp pool and first centrifugal pump, and the outlet of first centrifugal pump is connected with pulping pool;Clear water recovery pipeline includes clear water pool, and the outlet of clear water pool is respectively connected with first spraying pipeline and second spraying pipeline;First spraying pipeline includes multistage pump, and the outlet of multistage pump is respectively connected with net department big spraying and net blanket separation spraying;Second spraying pipeline includes second centrifugal pump, and the outlet of second centrifugal pump is respectively connected with wet part low-pressure spraying and wool cloth big spraying.Compared with prior art, the utility model can improve the resource utilization of white water, reduce the influence of direct discharge on environment.

Description

Technical Field

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

[0002] White water originates from the water released from the wire and press sections during the papermaking process in the papermaking workshop. A large amount of white water is generated during this process. White water contains a large number of fine fibers. Direct discharge of white water not only consumes a large amount of water but also puts a great burden on subsequent wastewater treatment and is not conducive to energy conservation and environmental protection.

[0003] CN203247449U discloses a white water recovery system for screening long and short fibers in papermaking. This system utilizes natural gravity to overflow white water from a short fiber removal white water tank to a long fiber removal white water tank via an overflow hole, and then overflows to a coarse screen feed tank, replacing the pumping method and achieving white water recovery and reuse. However, this white water recovery system still cannot effectively separate fibers from the white water, and cannot effectively utilize the fibers and clarified water in a targeted manner, significantly reducing the efficiency of white water recovery and reuse.

[0004] Therefore, a new treatment system that can make targeted and full use of white water still needs to be developed. Utility Model Content

[0005] The purpose of this invention is to provide a multi-stage white water treatment system to fully utilize white water from the papermaking process.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] This utility model provides a multi-stage white water treatment system, including a white water tank, a flotation device, a fiber recovery pipeline, and a clarified water recovery pipeline;

[0008] The outlet of the white water pool is connected to the flotation device;

[0009] The suspended solids outlet of the flotation device is connected to the fiber recovery pipeline, and the liquid outlet of the flotation device is connected to the clarified water recovery pipeline.

[0010] The fiber recycling pipeline includes a recycling tank and a first centrifugal pump, the outlet of which is connected to the pulping tank.

[0011] The clarified water recovery pipeline includes a clarified water tank, and the outlet of the clarified water tank is connected to the first spray pipeline and the second spray pipeline respectively.

[0012] The first spray pipeline includes a multi-stage pump, the outlet of which is connected to the large spray of the net section and the net-mat separation spray, respectively; the second spray pipeline includes a second centrifugal pump, the outlet of which is connected to the wet section low-pressure spray and the felt large spray, respectively.

[0013] Furthermore, the pulping tank includes a separately configured long fiber pulping tank and a short fiber pulping tank.

[0014] Furthermore, the outlet of the first centrifugal pump is connected to the long fiber pulping tank via the first pulping branch and to the short fiber pulping tank via the second pulping branch.

[0015] Furthermore, both the first and second pulping branches are equipped with regulating valves.

[0016] Furthermore, the outlet of the multi-stage pump is connected to the large spray system of the net section via the first spray branch, and to the net mat separation spray system via the second spray branch.

[0017] Furthermore, both the first and second spray branches are equipped with regulating valves.

[0018] Furthermore, the outlet of the second centrifugal pump is connected to the wet section low-pressure spray via the third spray branch and to the woolen fabric large spray via the fourth spray branch.

[0019] Furthermore, regulating valves are provided at the inlets of both the mesh sprayer and the felt sprayer.

[0020] Furthermore, the fourth spray branch also includes a filter for secondary filtration of the clarified water in the clarification tank.

[0021] Furthermore, the fourth spray branch also includes an ultra-clarified water tank, and the outlet of the filter is connected to the ultra-clarified water tank.

[0022] Furthermore, a regulating valve is provided at the inlet of the ultra-clarified water tank, and the outlet of the ultra-clarified water tank is connected to the large-scale spray system via a third centrifugal pump.

[0023] Furthermore, the regulating valve is either a manual valve or an electric valve.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The multi-stage white water treatment system of this invention performs preliminary and efficient solid-liquid separation of white water through a flotation device. The separated high-concentration fiber suspension is recycled through a fiber recovery pipeline, and the separated clarified water is reused through two independent spray pipelines. The system achieves multi-stage utilization of clarified water according to different spraying methods and water quality requirements. This multi-stage white water treatment system truly realizes the full utilization of white water, not only improving the resource utilization of white water but also reducing the environmental impact of direct discharge.

[0026] (2) According to the different requirements of different sprays for water quality and pressure, the white water multi-stage treatment system of this utility model adopts multi-stage pumps to provide higher pressure to supply the large spray of the net section and the net-mat separation spray, adopts centrifugal pumps to supply the low-pressure spray of the wet section and the large spray of the felt, and can also add filters to provide high-quality clarified water for the large spray of the felt with strict spray requirements.

[0027] (3) The white water multi-stage treatment system of this utility model combines the two pipelines of the large spraying of the net section and the separate spraying of the net blanket into one pipeline and shares a multi-stage pump, which can effectively reduce unnecessary pipelines and valves, simplify the system structure, and reduce the complexity and failure risk of the system. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the white water multi-stage treatment system of this utility model.

[0029] Figure 2 This is a schematic diagram of the white water multi-stage treatment system of Embodiment 3 of this utility model.

[0030] Explanation of markings in the diagram:

[0031] 1-White Water Pool;

[0032] 2-Steam flotation device;

[0033] 3-Fiber recycling pipeline, 31-Recycling pulp tank, 32-First centrifugal pump, 33-Pulping tank, 331-Long fiber pulping tank, 332-Short fiber pulping tank;

[0034] 4- Clarified water recovery pipeline, 41- Clarified water tank, 42- Multistage pump, 43- Large spray in the mesh section, 44- Mesh separation spray, 45- Second centrifugal pump, 46- Wet section low-pressure spray, 47- Large spray in the felt section, 48- Filter, 49- Ultra-clarified water tank, 410- Third centrifugal pump.

[0035] 5-Regulating valve. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0037] In this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] Example 1:

[0040] This embodiment provides a multi-stage white water treatment system, such as Figure 1 As shown, it specifically includes a white water tank 1, an air flotation device 2, a fiber recovery pipeline 3, and a clarified water recovery pipeline 4.

[0041] In this embodiment, the outlet of the white water tank 1 is connected to the flotation device 2 for preliminary solid-liquid separation of the white water in the white water tank 1. The suspended solids outlet of the flotation device 2 is connected to the fiber recovery pipeline 3, and the liquid outlet of the flotation device 2 is connected to the clarified water recovery pipeline 4, so that the fiber and clarified water after solid-liquid separation can be utilized respectively.

[0042] The fiber recycling pipeline 3 in this embodiment includes a recycling tank 31 and a first centrifugal pump 32, the outlet of which is connected to a pulping tank 33. The fibers in the pulping tank 33 can be reused in papermaking after subsequent pulping.

[0043] In this embodiment, the clarified water recovery pipeline 4 includes a clarified water tank 41. The outlet of the clarified water tank 41 is connected to a first spray pipeline and a second spray pipeline, respectively, enabling multi-stage utilization of clarified water through the two spray pipelines. The first spray pipeline includes a multi-stage pump 42, the outlet of which is connected to a mesh section large spray 43 and a mesh separation spray 44, respectively. The second spray pipeline includes a second centrifugal pump 45, the outlet of which is connected to a wet section low-pressure spray 46 and a felt cloth large spray 47, respectively.

[0044] In this embodiment, the flotation device 2 enables preliminary and efficient solid-liquid separation of white water. The separated high-concentration fiber suspension is transported to the pulping tank 33 through the fiber recovery pipeline 3. The separated clarified water is reused through two independent spray pipelines, and multi-stage utilization of clarified water is achieved according to different spraying methods and water quality requirements. Through the above-mentioned multi-stage white water treatment system, the targeted and full utilization of white water is truly realized, which not only improves the resource utilization of white water, but also reduces the environmental impact of direct discharge.

[0045] Example 2:

[0046] This embodiment provides a multi-stage white water treatment system, specifically including a white water tank 1, a flotation device 2, a fiber recovery pipeline 3, and a clarified water recovery pipeline 4.

[0047] In this embodiment, the outlet of the white water tank 1 is connected to the flotation device 2 for preliminary solid-liquid separation of the white water in the white water tank 1.

[0048] In this embodiment, the suspended solids outlet of the flotation device 2 is connected to the fiber recovery pipeline 3, and the liquid outlet of the flotation device 2 is connected to the clarified water recovery pipeline 4, so that the fiber and clarified water after solid-liquid separation can be utilized separately. In this embodiment, the turbidity of the flotation effluent from the flotation device 2 is ≤60 NTU, and the flotation efficiency is >80%.

[0049] The fiber recovery pipeline 3 in this embodiment includes a recovery slurry tank 31 and a first centrifugal pump 32, the outlet of which is connected to a pulping tank 33. The pulping tank 33 in this embodiment includes independently configured long fiber pulping tank 331 and short fiber pulping tank 332. The outlet of the first centrifugal pump 32 is connected to the long fiber pulping tank 331 via a first pulping branch and to the short fiber pulping tank 332 via a second pulping branch. Since long fibers and short fibers require different pulping times (approximately 8 minutes for long fibers and approximately 5 minutes for short fibers), this embodiment uses the first and second pulping branches to transport the gas-liquid separated slurry to different pulping treatment routes to meet the subsequent pulping requirements for different fiber lengths.

[0050] In this embodiment, the clarified water recovery pipeline 4 includes a clarified water tank 41. The outlet of the clarified water tank 41 is connected to the first spray pipeline and the second spray pipeline, respectively, so that the clarified water can be used in multiple stages through the two spray pipelines.

[0051] The first spray pipeline in this embodiment includes a multi-stage pump 42, and a regulating valve 5 is provided between the multi-stage pump 42 and the clarification tank 41. The outlet of the multi-stage pump 42 is connected to the main spray system 43 of the net section through a first spray branch, and to the net separation spray system 44 through a second spray branch. Regulating valves 5 are provided on both the first and second spray branches. In this embodiment, the use of the multi-stage pump 42 can provide higher pressure to supply the main spray system 43 of the net section and the net separation spray system 44.

[0052] The second spray pipeline in this embodiment includes a second centrifugal pump 45, and a regulating valve 5 is provided between the second centrifugal pump 45 and the clarification tank 41. The outlet of the second centrifugal pump 45 is connected to the wet-end low-pressure spray 46 through a third spray branch, and to the wool fabric large spray 47 through a fourth spray branch. Regulating valves 5 are provided at the inlets of both the wet-end low-pressure spray 46 and the wool fabric large spray 47.

[0053] In this embodiment, the regulating valve 5 on each pipeline is independently selected from manual valves or electric valves, which can be selected according to actual needs.

[0054] Example 3:

[0055] This embodiment provides a multi-stage white water treatment system, specifically including a white water tank 1, a flotation device 2, a fiber recovery pipeline 3, and a clarified water recovery pipeline 4.

[0056] The difference from Example 2 is that, as Figure 2 As shown, to meet the more demanding spraying requirements of the large-scale wool sprayer 47, the fourth spraying branch in this embodiment also includes a filter 48 for secondary deep filtration of the clarified water in the clarification tank 41, further removing tiny particles and colloidal substances from the clarified water, significantly reducing turbidity and suspended solids concentration. Through the primary filtration of the flotation device 2 and the secondary filtration of the filter 48, a higher quality clarified water source can be formed specifically for supplying the large-scale wool sprayer 47. The large-scale wool sprayer 47 has high water quality requirements; otherwise, it is prone to clogging the wool pores. Therefore, secondary filtration is necessary to meet the water quality requirements of the large-scale wool sprayer 47.

[0057] The fourth spray branch in this embodiment also includes an ultra-clarified water tank 49, and the outlet of the filter 48 is connected to the ultra-clarified water tank 49 for temporary storage of clarified water after secondary filtration.

[0058] In this embodiment, a regulating valve 5 is provided at the inlet of the ultra-clarified water tank 49, and the outlet of the ultra-clarified water tank 49 is connected to the large cloth sprayer 47 through the third centrifugal pump 410.

[0059] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A multi-stage white water treatment system, characterized in that, It includes a white water tank (1), an air flotation device (2), a fiber recovery pipeline (3), and a clarified water recovery pipeline (4); The outlet of the white water pool (1) is connected to the flotation device (2); The suspended solids outlet of the flotation device (2) is connected to the fiber recovery pipeline (3), and the liquid outlet of the flotation device (2) is connected to the clarified water recovery pipeline (4). The fiber recycling pipeline (3) includes a recycling slurry tank (31) and a first centrifugal pump (32), the outlet of which is connected to a pulping tank (33); The clarified water recovery pipeline (4) includes a clarified water tank (41), and the outlet of the clarified water tank (41) is connected to the first spray pipeline and the second spray pipeline respectively. The first spray pipeline includes a multi-stage pump (42), the outlet of which is connected to the large spray of the net section (43) and the net-mat separation spray (44) respectively; the second spray pipeline includes a second centrifugal pump (45), the outlet of which is connected to the wet section low-pressure spray (46) and the felt large spray (47) respectively.

2. The white water multi-stage treatment system according to claim 1, characterized in that, The pulping tank (33) includes a long fiber pulping tank (331) and a short fiber pulping tank (332) that are set up independently; The outlet of the first centrifugal pump (32) is connected to the long fiber pulping tank (331) through the first pulping branch and to the short fiber pulping tank (332) through the second pulping branch.

3. The white water multi-stage treatment system according to claim 2, characterized in that, Both the first and second pulping branches are equipped with regulating valves (5).

4. The white water multi-stage treatment system according to claim 1, characterized in that, The outlet of the multi-stage pump (42) is connected to the large net spray (43) through the first spray branch and to the net separation spray (44) through the second spray branch.

5. A multi-stage white water treatment system according to claim 4, characterized in that, Both the first and second spray branches are equipped with regulating valves (5).

6. A multi-stage white water treatment system according to claim 1, characterized in that, The outlet of the second centrifugal pump (45) is connected to the wet section low-pressure spray (46) through the third spray branch, and to the woolen cloth large spray (47) through the fourth spray branch. Both the wet section low-pressure spray (46) and the felt large spray (47) are equipped with regulating valves (5) at their inlets.

7. A multi-stage white water treatment system according to claim 6, characterized in that, The fourth spray branch also includes a filter (48) for secondary filtration of the clarified water in the clarification tank (41).

8. A multi-stage white water treatment system according to claim 7, characterized in that, The fourth spray branch also includes an ultra-clarified water tank (49), and the outlet of the filter (48) is connected to the ultra-clarified water tank (49).

9. A multi-stage white water treatment system according to claim 8, characterized in that, The ultra-clarified water tank (49) is equipped with a regulating valve (5) at its inlet, and the outlet of the ultra-clarified water tank (49) is connected to the woolen large spray (47) via a third centrifugal pump (410).

10. A multi-stage white water treatment system according to any one of claims 3, 5, and 6, characterized in that, The regulating valve (5) is either a manual valve or an electric valve.

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