Tail pulp recycling system of papermaking drifting system

Abstract

The utility model relates to a papermaking drifting system tail pulp recycling system which comprises a tail pulp pipeline, one end of the tail pulp pipeline is connected with a tail pulp opening of a pressure screen of a drifting system, and the other end of the tail pulp pipeline is connected with a pulp inlet pipeline of a primary grading screen of a pulping system. A dilution water pipeline of the primary classifying screen is provided with a second valve which is used for adjusting the opening degree of the dilution water pipeline. According to the utility model, the tail slurry of the pressurized screen is introduced into the primary grading screen through the tail slurry pipeline, so that the tail slurry is recycled; a part of dilution water is replaced by the tail pulp, the concentration of the pulp subjected to coarse screening is reduced, the use amount of the dilution water is reduced, the tail pulp of a drifting system can be recycled, and water resources can be saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking flow conveying systems, in particular to a tail stock recycling system of a papermaking flow conveying system. Background Art

[0002] The papermaking production process generally includes a pulping system, a pulping system, and a papermaking system. The papermaking system includes an approach conveying system. The approach conveying system is the entire process of conveying the pulp processed by the pulping system to the headbox. Its main function is to stably and evenly convey the pulp to the forming wire of the papermaking machine, while adding certain auxiliary materials to ensure the continuity and quality stability of paper production.

[0003] For example, the Chinese patent with publication number CN107447566A previously disclosed by the applicant discloses a production process for upper and lower paper of coated paper, and discloses the process flow of papermaking, in which the flow conveying system generally includes a pulp pump, a pressure screen and a pulp headbox. The pressure screen is used to further screen and level the pulp, remove coarse fiber bundles in the pulp and other impurities dropped during the conveying process, and make the pulp more uniform and fine.

[0004] The pressure screen discharges the impurities separated during the screening process along with a portion of the pulp from the tailings pipeline. The tailings in the tailings pipeline are generally discharged, causing waste. Alternatively, for recycling, the OCC production line will pass the tailings into the long fiber deslagging system in the pulping system to remove the slag and recycle the pulp. Figure 1 As shown, the tail slurry enters the long fiber removal system and the long fiber fine screening system in sequence along with the good pulp screened out by the slag removal system and the secondary classification system, and then enters the long fiber concentration system. However, since the tail slurry contains a certain amount of auxiliary materials added by the flow conveying system, it will make it difficult for the multi-disc concentrator of the long fiber concentration system to dehydrate, the unloading dryness is low, and the pulp cannot be normally transported to the long fiber heat disperser through the inclined screw conveyor, affecting the long fiber heat dispersion effect. Utility Model Content

[0005] The purpose of the utility model is to provide a papermaking flow system tail stock recycling system, which can recycle the tail stock of the flow system without affecting the long fiber concentration system and the long fiber heat dispersion system.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is a papermaking flow system tail stock recycling system, including a tail stock pipeline,

[0007] One end of the tail stock pipeline is connected to the tail stock outlet of the pressure screen of the flow system, and the other end is connected to the pulp inlet pipeline of the primary classification screen of the pulping system.

[0008] Preferably, a first valve is installed on the tailings slurry pipeline.

[0009] Preferably, the dilution water pipeline of the primary grading screen is installed with a second valve for adjusting the opening of the dilution water pipeline.

[0010] Preferably, the tailings slurry pipeline is connected to a slurry discharge pipeline, the slurry discharge pipeline is between the first valve and the pressure screen, and a third valve is installed on the slurry discharge pipeline.

[0011] The utility model discloses a papermaking flow system tail stock recycling system, which has the following advantages compared with the existing technology:

[0012] (1) The tail slurry from the pressure screen is passed through the tail slurry pipeline to the primary grading screen for recycling. The tail slurry and the coarse screened slurry pass through the primary grading screen and the secondary grading screen together. The auxiliary materials therein will be dispersed and diluted, and will no longer cause any impact when the slurry flows into the long fiber concentration system;

[0013] (2) Using tailings to replace part of the dilution water reduces the concentration of the slurry after coarse screening and reduces the amount of dilution water used, which can recycle the tailings of the flow system and save water resources;

[0014] (3) Simple design and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the pulping system structure of the OCC production line;

[0016] Figure 2 This is a schematic diagram of the structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the pulping section of the OCC production line of the utility model. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 2 and Figure 3 As shown, a papermaking flow system tail stock recycling system includes a tail stock pipeline 11,

[0020] One end of the tailings pipe 11 is connected to the tailings port of the pressure screen 1 of the flow system, and the other end is connected to the pulp inlet pipe 21 of the primary grading screen 2 of the pulping system. A first valve 111 is installed on the tailings pipe 11. The tailings of the pressure screen 1 are passed into the primary grading screen 2 through the tailings pipe 11 to recycle the tailings. The tailings and a section of coarse screened pulp pass through the primary grading screen 2 and the secondary grading screen together. The auxiliary materials therein will be dispersed and diluted, and will no longer have an impact when the pulp flows into the long fiber concentration system.

[0021] Since the concentration of the slurry sprayed onto the screen through the headbox is 0.4%-0.8%, the tail slurry of the flow system is a low-concentration slurry, and since the grading screen needs to add dilution water to dilute and screen the slurry after coarse screening, in this embodiment, the dilution water pipeline 22 of the primary grading screen 2 is installed with a second valve 221 for adjusting the opening of the dilution water pipeline 22, replacing part of the dilution water with the tail slurry, reducing the concentration of the slurry after coarse screening, and reducing the use of dilution water, that is, the tail slurry of the flow system can be recycled and water resources can be saved.

[0022] In this embodiment, the tailings slurry pipe 11 is connected to a slurry discharge pipe 12, which is between the first valve 111 and the pressure screen 1, and a third valve 121 is installed on the slurry discharge pipe 12. After the pulping system stops, the first valve 111 is closed and the third valve 121 is opened to discharge the tailings slurry and no longer pass into the primary grading screen 2.

[0023] The method of using the utility model is that when the pressure screen 1 of the flow system is started, the tail slurry enters the slurry inlet pipe 21 of the primary grading screen 2 through the tail slurry pipe 11, and at the same time, the opening of the second valve 221 is adjusted to reduce the water inflow of the dilution water, and the tail slurry replaces part of the dilution water. When the pulping system stops, the first valve 111 is closed and the third valve 121 is opened to discharge the tail slurry.

Claims

1. A papermaking approach flow system tail stock recycling system, characterized in that: including a tail slurry pipeline (11), One end of the tail stock pipe (11) is connected to the tail stock outlet of the pressure screen (1) of the flow system, and the other end is connected to the pulp inlet pipe (21) of the primary classification screen (2) of the pulping system.

2. The papermaking approach flow system tailings recycling system according to claim 1, characterized in that: A first valve (111) is installed on the tail slurry pipeline (11).

3. The papermaking approach flow system tail stock recycling system according to claim 1, characterized in that: The dilution water pipeline (22) of the primary grading screen (2) is equipped with a second valve (221) for adjusting the opening of the dilution water pipeline (22).

4. The papermaking approach flow system tail stock recycling system according to claim 1, characterized in that: The tailings slurry pipeline (11) is connected to a slurry discharge pipeline (12), the slurry discharge pipeline (12) is between the first valve (111) and the pressure screen (1), and a third valve (121) is installed on the slurry discharge pipeline (12).

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