Mechanical pulp adding device and papermaking production line

Abstract

The utility model relates to a kind of mechanical pulp adding device and papermaking production line, including first pulp pool, refiner, second pulp pool, pressure screen and dilution water supply pipeline;The input end of refiner is connected the output end of first pulp pool by first feeding pipe;The input end of second pulp pool is connected the output end of refiner by first discharge pipe;The input end of pressure screen is connected the output end of second pulp pool by second feeding pipe, OCC pulp line is connected to the good pulp output end of pressure screen, the input end of first pulp pool is connected to the tail pulp output end of pressure screen;The output end of dilution water supply pipeline is communicated with second feeding pipe.This mechanical pulp adding device is beaten by refiner to mechanical pulp and is defibrated, and the consistency of pulp after defibration is adjusted by dilution water supply pipeline, and pulp is screened and filtered using pressure screen, and the good pulp obtained after filtration is distributed to OCC pulp line and waste paper fiber together, which can increase the mixing amount of mechanical pulp, thereby reducing the cost of production.

Description

Technical Field

[0001] This utility model relates to the field of pulp and paper technology, and in particular to a mechanical pulp addition device and a paper production line. Background Technology

[0002] In the pulp and paper industry, OCC (used corrugated cardboard) pulp lines are an important raw material system for kraft paper production, and their fiber recycling has significant economic and environmental benefits. In recent years, in order to reduce production costs, the industry has tried to blend inexpensive mechanical pulp (wood fiber) into OCC pulp. However, mechanical pulp has coarse fibers and a high content of residues on sieves. If it is directly introduced into the pulping system, it will not only lead to deterioration of pulp filtration performance and frequent paper machine malfunctions, but also cause quality problems such as a decrease in the physical strength of the finished paper and surface sieve marks.

[0003] Current processes often employ compromise solutions that limit the proportion of mechanical pulp added, but this approach fails to fully leverage the cost advantages of mechanical pulp, leading to a long-term operational dilemma for companies: excessively high raw material costs and persistently low product profit margins. How to achieve a high proportion of mechanical pulp application while ensuring paper machine stability and paper quality has become a key technological bottleneck restricting cost reduction and efficiency improvement in the packaging paper industry. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the existing technology often adopts the method of limiting the addition ratio to introduce mechanical pulp into the OCC pulping line to reduce production costs. However, this approach cannot give full play to the cost advantage of mechanical pulp, resulting in enterprises facing the long-term operational dilemma of excessively high raw material costs and continuously declining product profit margins.

[0005] To solve the above-mentioned technical problems, this utility model provides a mechanical slurry adding device for providing mechanical slurry to an OCC slurry line, comprising,

[0006] First slurry pool;

[0007] A pulp refiner, wherein the input end of the pulp refiner is connected to the output end of the first pulp tank via a first feed pipe;

[0008] The second pulp tank, the input end of which is connected to the output end of the pulper via the first discharge pipe;

[0009] The pressure screen has its input end connected to the output end of the second slurry tank via a second feed pipe, its good slurry output end connected to the OCC slurry line via a second discharge pipe, and its tail slurry output end connected to the input end of the first slurry tank via a circulation pipe.

[0010] A dilution water supply pipeline, wherein the input end of the dilution water supply pipeline is connected to a dilution water supply device, and the output end of the dilution water supply pipeline is connected to a second feed pipe.

[0011] In one embodiment of this utility model, a first slurry pump is provided on the first feed pipe.

[0012] In one embodiment of the present invention, a second slurry pump is provided on the second feed pipe, and the dilution water supply pipeline is connected to the section of the second feed pipe located between the second slurry pump and the second slurry tank.

[0013] In one embodiment of this utility model, a concentration meter is provided on the second feed pipe between the second slurry pump and the pressure screen.

[0014] In one embodiment of this utility model, a pneumatic regulating valve is provided on the dilution water supply pipeline.

[0015] In one embodiment of this utility model, a controller is also included, which is connected to the concentration meter and the pneumatic regulating valve respectively.

[0016] In one embodiment of this utility model, the sieve gap of the pressure screen is 0.15mm-0.2mm.

[0017] In one embodiment of this utility model, the slurry concentration output from the second feed pipe is 1.5%-2%.

[0018] In one embodiment of this utility model, the pulper is a dual-disc pulper.

[0019] A paper production line includes a mechanical pulp addition device as described in any of the above.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The present invention relates to a mechanical pulp addition device and a papermaking production line, comprising a first pulp tank, a refiner, a second pulp tank, a pressure screen, and a dilution water supply pipeline; the input end of the refiner is connected to the output end of the first pulp tank via a first feed pipe; the input end of the second pulp tank is connected to the output end of the refiner via a first discharge pipe; the input end of the pressure screen is connected to the output end of the second pulp tank via a second feed pipe, the good pulp output end of the pressure screen is connected to the OCC pulp line, and the tail pulp output end of the pressure screen is connected to the input end of the first pulp tank; the output end of the dilution water supply pipeline is connected to the second feed pipe. This mechanical pulping device is equipped with a first pulp tank and a second pulp tank to buffer the pulp. A refiner is installed between the first and second pulp tanks to break down the mechanical pulp, refining the fibers. The concentration of the refined pulp is adjusted through a dilution water supply pipeline. Simultaneously, a pressure screen connected to the rear end of the second pulp tank filters the pulp after beating. The filtered high-quality pulp is then delivered to the OCC pulp line for use with waste paper fibers. Through the processing of this mechanical pulping device, the amount of mechanical pulp added during the production process can be increased, ensuring the final product quality while significantly reducing production costs. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the mechanical slurry adding device according to a preferred embodiment of the present invention;

[0024] Figure 2 This is a structural schematic diagram of the connection position of the dilution water supply pipeline of the mechanical slurry adding device according to a preferred embodiment of the present invention.

[0025] Explanation of reference numerals in the accompanying drawings: 1. First pulp tank; 2. Pulping mill; 21. First feed pipe; 22. First discharge pipe; 3. Second pulp tank; 4. Pressure screen; 41. Second feed pipe; 42. Second discharge pipe; 43. Circulation pipe; 5. Dilution water supply pipeline; 6. First pulp pump; 7. Second pulp pump; 8. Concentrator; 9. Pneumatic regulating valve. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0027] Example 1: Refer to Figure 1 and Figure 2As shown, this utility model discloses a mechanical slurry adding device for providing mechanical slurry to an OCC slurry line, comprising:

[0028] First slurry pool 1;

[0029] The input end of the pulper 2 is connected to the output end of the first pulp tank 1 through the first feed pipe 21;

[0030] The second pulp tank 3 has its input end connected to the output end of the refiner 2 via the first discharge pipe 22;

[0031] Pressure screen 4, the input end of pressure screen 4 is connected to the output end of the second slurry tank through the second feed pipe 41, the good slurry output end of pressure screen 4 is connected to the OCC slurry line through the second discharge pipe 42, and the tail slurry output end of pressure screen is connected to the input end of the first slurry tank 1 through the circulation pipe 43.

[0032] The dilution water supply pipeline 5 has a dilution water supply device connected to its input end and a second feed pipe 41 connected to its output end.

[0033] Specifically, the first pulp tank 1 is used to temporarily store the initial mechanical pulp. The output end of the first pulp tank 1 is connected to the input end of the refiner 2 through the first feed pipe 21. The first feed pipe 21 is equipped with a first pulp pump 6 to transport the mechanical pulp in the first pulp tank 1 to the refiner 2 through the first feed pipe 21. The mechanical pulp input into the refiner 2 is beaten and loosened by the mechanical action of the double grinding discs, which refines the coarse fibers and improves the fiber morphology of the mechanical pulp. The pulp after beating is transported to the second pulp tank 3 through the first discharge pipe 22. The second pulp tank 3 is used to buffer the pulp after beating. Under the action of the second pulp pump 7, the pulp in the second pulp tank 3 is fed into the pressure screen 4 through the second feed pipe 41 for filtration. A dilution water supply pipe 5 is connected to the second feed pipe 41. The concentration of the pulp fed into the pressure screen 4 is adjusted by adding dilution water. The pulp of the predetermined concentration is filtered and the resulting good pulp is transported to the long fiber desander of the OCC pulp line and used together with waste paper fibers. The resulting tail pulp is recycled to the first pulp tank 1 for reuse.

[0034] This invention discloses a mechanical pulp addition device, which includes a first pulp tank 1 and a second pulp tank 3 for buffering the pulp. A refiner 2 is installed between the first pulp tank 1 and the second pulp tank 3 to break down the mechanical pulp fibers. The concentration of the broken-down pulp is adjusted through a dilution water supply pipeline. The pulp is then screened and filtered by a pressure screen 4 installed after the second pulp tank 3. The filtered pulp is then delivered to the OCC pulp line for use with waste paper fibers. Through the processing of this mechanical pulp addition device, the amount of mechanical pulp added during the production process can be increased, which greatly reduces the production cost while ensuring the final product quality.

[0035] Furthermore, a first slurry pump 6 is installed on the first feed pipe 21.

[0036] Furthermore, a second slurry pump 7 is installed on the second feed pipe 41, and a dilution water supply pipeline 5 is connected to the section of the second feed pipe 41 located between the second slurry pump 7 and the second slurry tank 3.

[0037] Furthermore, a concentration meter 8 is installed on the second feed pipe 41 between the second slurry pump 7 and the pressure screen 4. The concentration meter 8 can detect the concentration of the slurry input into the pressure screen 4 through the second feed pipe 41 in real time. The opening of the pneumatic regulating valve 9 is adjusted according to the detected concentration value to adjust the concentration of the slurry, ensuring that the slurry is input into the pressure screen at a predetermined concentration, which is beneficial to the final quality of the product.

[0038] Furthermore, a pneumatic regulating valve 9 is installed on the dilution water supply pipeline.

[0039] Furthermore, it also includes a controller, which is connected to both the concentration meter 8 and the pneumatic regulating valve 9. The controller enables the interlocking of the concentration meter 8 and the pneumatic regulating valve 9.

[0040] Furthermore, the screen gap of pressure screen 4 is 0.15mm-0.2mm.

[0041] Furthermore, the slurry concentration output from the second feed pipe 41 is 1.5%-2%.

[0042] Furthermore, the pulper 2 is a dual-disc pulper.

[0043] Furthermore, the input end of the dilution water supply pipeline 5 is connected to the water circulation pipeline of the OCC pulp line, so that the white water circulated by the OCC pulp line can be used to dilute the pulp, reducing the cost of water use, and without increasing the cost of wastewater treatment.

[0044] Example 2: This utility model also discloses a papermaking production line, including the mechanical pulp addition device as in Example 1.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A mechanical slurry adding device for supplying mechanical slurry to an OCC slurry line, characterized in that: include, First slurry pool; A pulp refiner, wherein the input end of the pulp refiner is connected to the output end of the first pulp tank via a first feed pipe; The second pulp tank has its input end connected to the output end of the pulper via the first discharge pipe; The pressure screen has its input end connected to the output end of the second slurry tank via a second feed pipe, its good slurry output end connected to the OCC slurry line via a second discharge pipe, and its tail slurry output end connected to the input end of the first slurry tank via a circulation pipe. A dilution water supply pipeline, wherein the input end of the dilution water supply pipeline is connected to a dilution water supply device, and the output end of the dilution water supply pipeline is connected to a second feed pipe.

2. The mechanical slurry adding device according to claim 1, characterized in that: A first slurry pump is installed on the first feed pipe.

3. The mechanical slurry adding device according to claim 1, characterized in that: A second slurry pump is installed on the second feed pipe, and the dilution water supply pipeline is connected to the section of the second feed pipe located between the second slurry pump and the second slurry tank.

4. The mechanical slurry adding device according to claim 3, characterized in that: A concentration meter is installed on the second feed pipe between the second slurry pump and the pressure screen.

5. The mechanical slurry adding device according to claim 4, characterized in that: A pneumatic regulating valve is installed on the dilution water supply pipeline.

6. The mechanical slurry adding device according to claim 5, characterized in that: It also includes a controller, which is connected to the concentration meter and the pneumatic regulating valve respectively.

7. The mechanical slurry adding device according to claim 1, characterized in that: The screen gap of the pressure screen is 0.15mm-0.2mm.

8. The mechanical slurry adding device according to claim 1, characterized in that: The slurry concentration output from the second feed pipe is 1.5%-2%.

9. The mechanical slurry adding device according to claim 1, characterized in that: The pulper is a dual-disc pulper.

10. A papermaking production line, characterized in that: Includes the mechanical slurry addition device as described in any one of claims 1-9.

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