Paper pulp production system with white water recycling function

Abstract

The utility model relates to a paper pulp production system capable of recycling white water, which comprises a white water tank, an air floatation device, a short fiber defibering pipeline, a long fiber grinding pipeline and a sizing pipeline, and the tail ends of the short fiber defibering pipeline and the long fiber grinding pipeline are respectively converged to the sizing pipeline; an outlet of the white water tank is respectively connected with the first centrifugal pump and the second centrifugal pump; the first centrifugal pump is respectively connected with the short fiber defibering pipeline and the long fiber grinding pipeline and is used for respectively conveying white water in the white water tank into the short fiber defibering pipeline and the long fiber grinding pipeline; an outlet of the second centrifugal pump is respectively connected with the air floatation device and the sizing pipeline and is used for respectively conveying the white water in the white water tank into the air floatation device and the sizing pipeline. Compared with the prior art, the white water in the white water tank can be conveyed into the short fiber defibering pipeline, the long fiber pulping pipeline and the sizing pipeline, so that the white water can be recycled in the whole paper production system.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking, in particular to a pulp production system comprising white water recycling. Background Art

[0002] Whitewater is produced during the papermaking process in the papermaking process, resulting in large quantities of water, which contains numerous fine fibers. Direct discharge of this water not only consumes significant amounts of water but also places significant strain on wastewater treatment, increasing equipment operation and maintenance costs, leading to higher costs for finished paper, and negatively impacting energy conservation and environmental protection.

[0003] Furthermore, while current high-speed paper machines offer high production efficiency and capacity, they also consume relatively high amounts of energy and resources, particularly water. To reduce fresh water usage, whitewater is collected and collected in a whitewater tank. This water is then used for pulping, refining, and consistency adjustment during the pulping process. The efficient transportation and utilization of this whitewater tank throughout the entire pulp production system presents a pressing challenge.

[0004] Therefore, the existing pulp production system still needs to be improved to obtain a new pulp production system including white water recycling. Utility Model Content

[0005] The purpose of the utility model is to provide a pulp production system including white water recycling in order to realize the effective recycling of white water in the pulp production system.

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

[0007] A pulp production system including white water recycling, comprising a white water tank, a flotation device, a short fiber deflaking pipeline, a long fiber refining pipeline and a sizing pipeline, wherein the ends of the short fiber deflaking pipeline and the long fiber refining pipeline are respectively merged into the sizing pipeline;

[0008] The outlet of the white water tank is connected to a first centrifugal pump and a second centrifugal pump respectively;

[0009] The outlet of the first centrifugal pump is respectively connected to the short fiber deflaking pipeline and the long fiber refining pipeline, and is used to transport the white water in the white water pool to the short fiber deflaking pipeline and the long fiber refining pipeline respectively; the outlet of the second centrifugal pump is respectively connected to the flotation device and the sizing pipeline, and is used to transport the white water in the white water pool to the flotation device and the sizing pipeline respectively.

[0010] Furthermore, the staple fiber decomposition pipeline includes a staple fiber pre-beating tank, a third centrifugal pump, a decompressor, a staple fiber post-beating tank, and a fourth centrifugal pump connected in sequence, and the outlet of the fourth centrifugal pump is connected to the sizing pipeline. The decompressor is used to decompose the fibers to make them looser and more uniform for subsequent processing.

[0011] Furthermore, a concentration meter is provided at the outlet of the third centrifugal pump and the fourth centrifugal pump.

[0012] Furthermore, the outlet of the first centrifugal pump is connected to the inlet of the third centrifugal pump and the inlet of the fourth centrifugal pump through pipelines respectively.

[0013] Furthermore, regulating valves are provided between the first centrifugal pump and the third centrifugal pump, and between the first centrifugal pump and the fourth centrifugal pump.

[0014] Furthermore, the long fiber refining pipeline includes a long fiber beating front pool, a fifth centrifugal pump, a refiner, a long fiber beating rear pool and a sixth centrifugal pump connected in sequence, and the outlet of the sixth centrifugal pump is connected to the sizing pipeline.

[0015] Furthermore, the outlets of the fifth centrifugal pump and the sixth centrifugal pump are both provided with a concentration meter, which is used to measure the concentration of the slurry to ensure that the concentration of the slurry meets the requirements during the process.

[0016] Furthermore, the outlet of the first centrifugal pump is connected to the inlet of the fifth centrifugal pump and the inlet of the sixth centrifugal pump through pipelines respectively.

[0017] Furthermore, regulating valves are provided between the first centrifugal pump and the fifth centrifugal pump, and between the first centrifugal pump and the sixth centrifugal pump.

[0018] Furthermore, the sizing pipeline includes a mixing tank, a seventh centrifugal pump, a leveler refiner, a stocking tank, an eighth centrifugal pump, and a sizing tank, which are connected in sequence. The short fiber deflaking pipeline and the long fiber refining pipeline each terminate in the mixing tank of the sizing pipeline. The leveler refiner allows for thorough mixing of fibers and fillers, resulting in a more uniform pulp. This improves the quality and stability of the paper, making it smoother and more stable during printing and use.

[0019] Furthermore, a concentration meter is provided at the outlet of the seventh centrifugal pump and the eighth centrifugal pump.

[0020] Furthermore, in the pipeline connecting the second centrifugal pump and the sizing pipeline, regulating valves are provided between the second centrifugal pump and the seventh centrifugal pump, and between the second centrifugal pump and the eighth centrifugal pump.

[0021] Furthermore, the slurry outlet of the flotation device is connected to the slurry recovery pool, and the clear water outlet of the flotation device is connected to the clarified water pool.

[0022] Furthermore, the short fiber decomposing pipeline further includes a short fiber pulping tank, and the long fiber refining pipeline further includes a long fiber pulping tank.

[0023] Furthermore, the recovery pulp pool is connected to the short fiber pulp pool and the long fiber pulp pool respectively.

[0024] Furthermore, the clarified water tank is respectively connected to the wet part spray unit, the high-pressure fan-shaped spray unit and the carpet part high-pressure cleaning unit.

[0025] Furthermore, a filter and a super-clarified water tank are sequentially connected between the clarified water tank and the high-pressure cleaning unit of the carpet part.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The utility model can transport the white water in the white water pool to the short fiber debonding pipeline, the long fiber pulping pipeline and the sizing pipeline through the coordinated arrangement of the white water pool and the two centrifugal pumps, thereby realizing the reuse of the white water in the entire paper production system.

[0028] (2) The utility model separates the concentrated water of the deflaking machine in the short fiber refining pipeline, the refiner in the long fiber refining pipeline and the leveling refiner in the sizing pipeline, and reduces the impact of the start and stop of a single device on other devices through the coordination of structures such as a centrifugal pump and a regulating valve.

[0029] (3) The pulp production system of the present invention ensures the relative independence of white water transportation in several pipelines without mutual interference, which not only protects the grinding discs of the pulping equipment from being easily worn and increases the service life of the grinding discs, but also ensures the quality of the base paper and plays a stabilizing role in the quantitative and tensile strength of the paper.

[0030] (4) The pulp production system of the present invention is provided with a branch pipeline including a flotation device for flotation treatment of a portion of the white water in the white water tank, thereby increasing the reuse rate of the white water. The fine fibers are recycled and can be reused in the short fiber decomposition pipeline and the long fiber refining pipeline; the treated clean water is more suitable for subsequent spraying and high-pressure cleaning units. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of the pulp production system of Example 2 of the present utility model.

[0032] Figure 2 This is a structural schematic diagram of the pulp production system of Example 3 of the present utility model.

[0033] Description of the marks in the figure:

[0034] 1- White Water Pool;

[0035] 2- flotation device, 21- recovery slurry tank, 22- clarification tank, 23- wet end spray unit, 24- high pressure fan-shaped spray unit, 25- high pressure cleaning unit for blanket, 26- filter, 27- super-clarification tank;

[0036] 3-First centrifugal pump;

[0037] 4- Second centrifugal pump;

[0038] 5-short fiber de-stripping pipeline, 51-short fiber tapping front tank, 52-third centrifugal pump, 53-de-stripping machine, 54-short fiber tapping rear tank, 55-fourth centrifugal pump, 56-short fiber crushing tank;

[0039] 6-long fiber refining pipeline, 61-long fiber knocking front tank, 62-fifth centrifugal pump, 63-refiner, 64-long fiber knocking rear tank, 65-sixth centrifugal pump, 66-long fiber crushing tank;

[0040] 7-sizing pipeline, 71-mixing tank, 72-seventh centrifugal pump, 73-slurry machine, 74-slurry tank, 75-eighth centrifugal pump, 76-sizing tank;

[0041] 8-Concentration meter;

[0042] 9-Regulating valve. DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0044] In the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance; in addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0046] Example 1:

[0047] A pulp production system with white water recycling includes a white water tank 1, a flotation device 2, a short fiber decomposing pipeline 5, a long fiber refining pipeline 6 and a sizing pipeline 7, wherein the ends of the short fiber decomposing pipeline 5 and the long fiber refining pipeline 6 respectively merge into the sizing pipeline 7.

[0048] The outlets of the white water tank 1 of this embodiment are connected to a first centrifugal pump 3 and a second centrifugal pump 4. The first centrifugal pump 3 is connected to a short fiber deflaking pipeline 5 and a long fiber refining pipeline 6, respectively, for transporting white water from the white water tank 1 to the short fiber deflaking pipeline 5 and the long fiber refining pipeline 6, respectively. The outlets of the second centrifugal pump 4 are connected to a flotation device 2 and a sizing pipeline 7, respectively, for transporting white water from the white water tank 1 to the flotation device 2 and the sizing pipeline 7, respectively.

[0049] This embodiment is provided with two main centrifugal pumps, a first centrifugal pump 3 and a second centrifugal pump 4. The first centrifugal pump 3 can transport white water in the white water pool 1 to the short fiber debonding pipeline 5 and the long fiber refining pipeline 6, thereby meeting the demand for adding concentrated adjustment water for refining and mixing in the two pipelines; the second centrifugal pump 4 can transport white water to the flotation device 2 and the sizing pipeline 7, which can not only meet the demand for adding concentrated adjustment water for refining and mixing in the sizing pipeline 7, but also realize the recycling and reuse of white water, thereby realizing the reuse of white water in the entire pulp production system.

[0050] Example 2:

[0051] A pulp production system including white water recycling includes a white water tank 1, a flotation device 2, a short fiber deflaking pipeline 5, a long fiber refining pipeline 6, and a sizing pipeline 7. The ends of the short fiber deflaking pipeline 5 and the long fiber refining pipeline 6 respectively merge into the sizing pipeline 7. The outlet of the white water tank 1 is connected to a first centrifugal pump 3 and a second centrifugal pump 4, respectively. The first centrifugal pump 3 is connected to the short fiber deflaking pipeline 5 and the long fiber refining pipeline 6, respectively. The outlet of the second centrifugal pump 4 is connected to the flotation device 2 and the sizing pipeline 7, respectively, for transporting white water from the white water tank 1 to the flotation device 2 and the sizing pipeline 7, respectively.

[0052] Specifically, the staple fiber decomposition pipeline 5 of this embodiment includes a staple fiber pre-beating pool 51, a third centrifugal pump 52, a decomposing machine 53, a staple fiber post-beating pool 54 and a fourth centrifugal pump 55 connected in sequence. The outlet of the fourth centrifugal pump 55 is connected to the sizing pipeline 7. A concentration meter 8 is provided at the outlet of the third centrifugal pump 52 and the fourth centrifugal pump 55. The outlet of the first centrifugal pump 3 is connected to the inlet of the third centrifugal pump 52 and the inlet of the fourth centrifugal pump 55 through pipelines respectively. A regulating valve 9 is provided between the first centrifugal pump 3 and the third centrifugal pump 52, and between the first centrifugal pump 3 and the fourth centrifugal pump 55.

[0053] The long fiber refining pipeline 6 includes a long fiber tapping front pool 61, a fifth centrifugal pump 62, a pulping machine 63, a long fiber tapping back pool 64 and a sixth centrifugal pump 65 connected in sequence. The outlet of the sixth centrifugal pump 65 is connected to the sizing pipeline 7. The outlets of the fifth centrifugal pump 62 and the sixth centrifugal pump 65 are both provided with a concentration meter 8. The outlet of the first centrifugal pump 3 is connected to the inlet of the fifth centrifugal pump 62 and the inlet of the sixth centrifugal pump 65 through pipelines respectively. A regulating valve 9 is provided between the first centrifugal pump 3 and the fifth centrifugal pump 62, and between the first centrifugal pump 3 and the sixth centrifugal pump 65.

[0054] The sizing pipeline 7 includes a mixing tank 71, a seventh centrifugal pump 72, a leveler refiner 73, a pulping tank 74, an eighth centrifugal pump 75, and a sizing tank 76, which are connected in sequence. The ends of the short fiber decomposition pipeline 5 and the long fiber refining pipeline 6 respectively converge into the mixing tank 71 of the sizing pipeline 7. The outlets of the seventh centrifugal pump 72 and the eighth centrifugal pump 75 are both equipped with a concentration meter 8. In the pipeline connecting the second centrifugal pump 4 and the sizing pipeline 7, regulating valves 9 are installed between the second centrifugal pump 4 and the seventh centrifugal pump 72, and between the second centrifugal pump 4 and the eighth centrifugal pump 75.

[0055] The production process of the pulp production system of this embodiment is as follows:

[0056] The white water generated during the production process is collected in the white water tank 1 and used as concentrated water. The white water in the white water tank 1 is transported to the short fiber deflaking pipeline 5 and the long fiber refining pipeline 6 through the first centrifugal pump 3. Specifically, in the short fiber deflaking pipeline 5, the short fibers in the short fiber tapping front pool 51 are transported to the deflaking machine 53 through the third centrifugal pump 52, and the slurry concentration is adjusted by the white water taken out by the first centrifugal pump 3, and then input into the short fiber tapping back pool 54. Similarly, in the long fiber refining pipeline 6, the long fibers in the long fiber tapping front pool 61 are transported to the refiner 63 through the fifth centrifugal pump 62, and the slurry concentration is adjusted by the white water taken out by the first centrifugal pump 3, and then input into the long fiber tapping back pool 64. When the slurries in the short fiber tapping tank 54 and the long fiber tapping tank 64 need to be mixed, the two slurries are respectively fed into the mixing tank 71 via the fourth centrifugal pump 55 and the sixth centrifugal pump 65 for mixing. The slurry concentration can still be adjusted by white water drawn from the first centrifugal pump 3. The above white water delivery process can be controlled by the opening and closing of the regulating valve 9 and can be feedback-adjusted by the concentration meter 8.

[0057] In the sizing pipeline 7, the slurry in the mixing tank 71 is input into the leveler refiner 73 through the seventh centrifugal pump 72, and then into the stocking tank 74 for standby use. When sizing is required, it is input into the sizing tank 76 for sizing through the eighth centrifugal pump 75. When the leveler refiner 73 and the sizing tank 76 need concentrated water to adjust the slurry concentration, the white water in the white water tank 1 can be input into the leveler refiner 73 or the sizing tank 76 through the second centrifugal pump 4.

[0058] In this embodiment, the white water transportation in several pipelines remains relatively independent and does not interfere with each other, which not only protects the refining equipment from wear and tear and increases the service life of the refining plates, but also ensures the quality of the base paper and plays a stabilizing role in the basis weight and tensile strength of the paper.

[0059] Example 3:

[0060] A pulp production system with white water recycling includes a white water tank 1, a flotation device 2, a short fiber deflaking pipeline 5, a long fiber refining pipeline 6, and a sizing pipeline 7. The outlet of the white water tank 1 is connected to a first centrifugal pump 3 and a second centrifugal pump 4, respectively. The outlet of the second centrifugal pump 4 is connected to the flotation device 2 and the sizing pipeline 7, respectively, for transporting white water from the white water tank 1 to the flotation device 2 and the sizing pipeline 7, respectively.

[0061] The difference from Example 2 is that Figure 2 As shown, in this embodiment, the slurry outlet of the flotation device 2 is connected to the recovery tank 21. The short fiber deflating pipeline 5 also includes a short fiber crushing tank 56, and the long fiber refining pipeline 6 also includes a long fiber crushing tank 66. The recovery tank 21 is connected to the short fiber crushing tank 56 and the long fiber crushing tank 66, respectively, and centrifugal pumps are installed in the connecting pipelines for conveying. In actual production, the recovered fibers are often short, so most of them will be passed into the short fiber crushing tank 56.

[0062] The clean water outlet of the flotation device 2 of this embodiment is connected to a clarified water tank 22. The clarified water tank 22 is connected to a wet section spray unit 23, a high-pressure fan-shaped spray unit 24, and a carpet high-pressure cleaning unit 25. A filter 26 and an ultra-clarified water tank 27 are connected in sequence between the clarified water tank 22 and the carpet high-pressure cleaning unit 25. Each of these connecting pipelines is equipped with a corresponding centrifugal pump.

[0063] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A pulp production system comprising white water recycling, characterized in that: It comprises a white water tank (1), a flotation device (2), a short fiber decomposing pipeline (5), a long fiber refining pipeline (6) and a sizing pipeline (7), wherein the ends of the short fiber decomposing pipeline (5) and the long fiber refining pipeline (6) are respectively merged into the sizing pipeline (7); The outlet of the white water tank (1) is connected to a first centrifugal pump (3) and a second centrifugal pump (4) respectively; The outlet of the first centrifugal pump (3) is respectively connected to the short fiber deflaking pipeline (5) and the long fiber refining pipeline (6), and is used to transport the white water in the white water tank (1) to the short fiber deflaking pipeline (5) and the long fiber refining pipeline (6), respectively; the outlet of the second centrifugal pump (4) is respectively connected to the steam flotation device (2) and the sizing pipeline (7), and is used to transport the white water in the white water tank (1) to the steam flotation device (2) and the sizing pipeline (7), respectively.

2. A pulp production system comprising white water recycling according to claim 1, characterized in that: The staple fiber decomposing pipeline (5) includes a staple fiber pre-beating pool (51), a third centrifugal pump (52), a decomposing machine (53), a staple fiber post-beating pool (54) and a fourth centrifugal pump (55) connected in sequence, and the outlet of the fourth centrifugal pump (55) is connected to the sizing pipeline (7); Concentration meters (8) are provided at the outlets of the third centrifugal pump (52) and the fourth centrifugal pump (55).

3. A pulp production system comprising white water recycling according to claim 2, characterized in that: The outlet of the first centrifugal pump (3) is connected to the inlet of the third centrifugal pump (52) and the inlet of the fourth centrifugal pump (55) through pipelines respectively; Regulating valves (9) are provided between the first centrifugal pump (3) and the third centrifugal pump (52), and between the first centrifugal pump (3) and the fourth centrifugal pump (55).

4. A pulp production system comprising white water recycling according to claim 1, characterized in that: The long fiber refining pipeline (6) includes a long fiber tapping front pool (61), a fifth centrifugal pump (62), a pulping machine (63), a long fiber tapping rear pool (64) and a sixth centrifugal pump (65) connected in sequence, and the outlet of the sixth centrifugal pump (65) is connected to the sizing pipeline (7); Concentration meters (8) are provided at the outlets of the fifth centrifugal pump (62) and the sixth centrifugal pump (65).

5. A pulp production system comprising white water recycling according to claim 4, characterized in that: The outlet of the first centrifugal pump (3) is connected to the inlet of the fifth centrifugal pump (62) and the inlet of the sixth centrifugal pump (65) through pipelines respectively; Regulating valves (9) are provided between the first centrifugal pump (3) and the fifth centrifugal pump (62), and between the first centrifugal pump (3) and the sixth centrifugal pump (65).

6. A pulp production system comprising white water recycling according to claim 1, characterized in that: The sizing pipeline (7) comprises a mixing tank (71), a seventh centrifugal pump (72), a leveler refiner (73), a pulping tank (74), an eighth centrifugal pump (75) and a sizing tank (76) which are connected in sequence, and the ends of the short fiber decomposing pipeline (5) and the long fiber refining pipeline (6) are respectively merged into the mixing tank (71) of the sizing pipeline (7); Concentration meters (8) are provided at the outlets of the seventh centrifugal pump (72) and the eighth centrifugal pump (75).

7. A pulp production system comprising white water recycling according to claim 6, characterized in that: In the pipeline connecting the second centrifugal pump (4) and the sizing pipeline (7), regulating valves (9) are provided between the second centrifugal pump (4) and the seventh centrifugal pump (72), and between the second centrifugal pump (4) and the eighth centrifugal pump (75).

8. A pulp production system comprising white water recycling according to claim 1, characterized in that: The slurry outlet of the flotation device (2) is connected to the slurry recovery pool (21), and the clear water outlet of the flotation device (2) is connected to the clarified water pool (22).

9. A pulp production system comprising white water recycling according to claim 8, characterized in that: The short fiber decomposing pipeline (5) further includes a short fiber pulping tank (56), and the long fiber refining pipeline (6) further includes a long fiber pulping tank (66); The recovery pulp pool (21) is connected to the short fiber pulp pool (56) and the long fiber pulp pool (66) respectively.

10. A pulp production system comprising white water recycling according to claim 8, characterized in that: The clarified water tank (22) is respectively connected to the wet part spray unit (23), the high-pressure fan-shaped spray unit (24) and the carpet part high-pressure cleaning unit (25); A filter (26) and a super-clarified water tank (27) are sequentially connected between the clarified water tank (22) and the carpet high-pressure cleaning unit (25).

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