A slurry concentration and return water treatment system

Abstract

The utility model discloses a slurry concentration and backwater treatment system, comprising an arc screen, a coarse separation backwater bin, a fiber recovery machine, a screw press and a fine separation backwater bin which are arranged on a basic support, a drainage pipe 1 is connected between the water outlet of the arc screen and the water inlet of the coarse separation backwater bin, a slag discharge pipe 1 is connected between the slag outlet of the arc screen and the feed inlet of the screw press; a water inlet pipe 2 is connected between the water outlet of the coarse separation backwater bin and the water inlet of the fiber recovery machine; a drainage pipe 2 is connected between the water outlet of the fiber recovery machine and the water inlet of the fine separation backwater bin, a slag discharge pipe 2 is connected between the slag outlet of the fiber recovery machine and the feed inlet of the screw press; a drainage pipe 3 is connected between the water outlet of the screw press and the water inlet of the coarse separation backwater bin; the utility model has the advantages of simple structure, reasonable layout, high fiber recovery accuracy, full recovery of fibers in backwater, strong backwater treatment capacity, stable and reliable system operation, etc.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking backwater treatment, in particular to a pulp concentration and backwater treatment system. Background Art

[0002] In the papermaking process, there are various filtering, washing and concentration processes. Since there is a certain amount of pulp running in the equipment during the process, the return water in the process inevitably contains residual fibers, which increases the processing pressure of the front-end equipment and is difficult to relieve. It contains high-value characteristics, resulting in a long and extremely complicated process for the treatment and recovery of papermaking return water.

[0003] The existing recycling technology mainly uses a fiber recovery machine to directly recover the fibers in the drainage and then put the water into the return water system. The main principle of the fiber recovery machine is to use a grid drum to separate the fibers from the water, and then use a scraper to gather the fibers and send them to the discharge port. In this process, due to the high solid content of the initial wastewater, it will be difficult to clean the grid drum of the fiber recovery machine, which will inevitably cause blockage and reduced processing capacity. The scraper collection method will cause mechanical damage to the fibers, reduce the fiber length, and make the quality of the recovered fibers unstable and difficult to reuse, which will bring inevitable problems to the subsequent process;

[0004] Patent publication number CN103130352B discloses a pulp recovery process and equipment, which specifically discloses that a pulp-residue separator is first used to remove impurities such as heavy residue and floating scum, and the banknote paper wastewater after the residue is removed is sent to a fiber recovery machine for pulp recovery, and the recovered pulp is then flowed from a transition storage tank into a double-screw pulping machine for further concentration treatment; however, there are problems such as low fiber recovery accuracy, insufficient fiber recovery in return water, poor return water treatment capacity, and unstable system operation. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a slurry concentration and return water treatment system. The return water treatment system has a simple structure, a reasonable layout, a high fiber recovery accuracy, and can fully recover the fibers in the return water; and the recovered fibers have no mechanical damage and are of good quality, the return water treatment capacity is strong, the system runs stably and reliably, a large amount of water treatment cost and time can be saved, and the problems in the background technology can be effectively solved.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a slurry concentration and backwater treatment system, comprising an arc screen, a coarse separation backwater bin, a fiber recovery machine, a screw press and a fine separation backwater bin provided on a basic support, a drainage pipe 1 is connected between the water outlet of the arc screen and the water inlet of the coarse separation backwater bin, a slag discharge pipe 1 is connected between the slag outlet of the arc screen and the feed inlet of the screw press; a water inlet pipe 2 is connected between the water outlet of the coarse separation backwater bin and the water inlet of the fiber recovery machine, and a conveying pump is connected to the water inlet pipe 2; a drainage pipe 2 is connected between the water outlet of the fiber recovery machine and the water inlet of the fine separation backwater bin, a slag discharge pipe 2 is connected between the slag outlet of the fiber recovery machine and the feed inlet of the screw press; a drainage pipe 3 is connected between the water outlet of the screw press and the water inlet of the coarse separation backwater bin.

[0007] Furthermore, the arc screen includes a screen box, in which partitions are arranged at equal intervals along the length direction, and the screen box is divided into a plurality of independent screening chambers by the partitions, and each screening chamber is provided with an arc screen; a water inlet pipe is arranged at the top of the screen box corresponding to the screening chamber, and a slag discharge pipe is connected to the bottom of the screen box at the slag outlet corresponding to the screening chamber, and a collecting hopper is connected to the starting end of the slag discharge pipe, and the collecting hopper is a square funnel structure, and the slag discharge pipe is connected to the collecting hopper; a water outlet pipe is connected to the bottom of the screen box at the water outlet corresponding to the screening chamber, and the water outlet pipe connected to the screening chamber is connected to the starting end of a drain pipe.

[0008] Furthermore, the basic support includes a bottom plate and a top plate, and a vertical beam is provided between the bottom plate and the top plate; the coarse separation return water bin and the fine separation return water bin are both arranged on the bottom plate; a support seat one which is higher than the coarse separation return water bin and the fine separation return water bin is also provided on the bottom plate, and a screw press is arranged on the support seat one; the arc screen and the fiber recovery machine are arranged on the top plate.

[0009] Furthermore, a support seat 2 is provided on the top plate at a position corresponding to the arc screen, and the arc screen is fixedly arranged on the support seat 2; a U-shaped support seat is provided on the top plate at a position corresponding to the fiber recovery machine, and the fiber recovery machine is fixedly arranged on the U-shaped support seat; pipeline holes are provided on the top plate at positions corresponding to the slag discharge pipe 1, the drainage pipe 1, the water inlet pipe 2, the drainage pipe 2 and the slag discharge pipe 2.

[0010] Furthermore, a ladder is provided between the bottom plate and the top plate of the basic support.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the slurry concentration and return water treatment system uses an arc screen as a coarse separation device in the return water to quickly and roughly separate the fibers in the return water, and can separate most of the fibers in the return water to relieve the pressure of the rear fine separation equipment, and there is no mechanical damage in the process of fiber separation by the arc screen, so the quality of the fibers can be guaranteed; the fiber recovery machine is used as a fine separation device to ensure that the return water can be used for the front-end process and the full recovery of the fibers; and because the arc screen has removed most of the fibers, the processing pressure of the fiber recovery machine is reduced, and the stability of the operation of the fiber recovery machine is guaranteed; the screw press is used as a concentration device to increase the concentration of the fibers, which is convenient for the storage, transportation and reuse of the fibers. The return water treatment system has a simple structure, a reasonable layout, a high fiber recovery accuracy, and can fully recover the fibers in the return water; and the recovered fibers have no mechanical damage and are of good quality, the return water treatment capacity is strong, the system operates stably and reliably, and a large amount of water treatment costs and time can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the basic support structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the pipeline connection of the return water treatment system of the utility model;

[0015] Figure 4 This is a schematic diagram of the curved screen structure of the utility model.

[0016] In the figure: 1. foundation support; 11. bottom plate; 12. top plate; 121. pipeline hole; 13. vertical beam; 14. support seat one; 15. support seat two; 16. U-shaped support seat; 2. curved screen; 21. screen box; 22. partition; 23. curved screen; 24. water inlet pipe one; 25. slag discharge pipe; 26. collecting hopper; 27. slag discharge pipe one; 28. drainage pipe one; 3. coarse separation return water bin; 4. fiber recovery machine; 41. water inlet pipe two; 42. drainage pipe two; 43. slag discharge pipe two; 5. screw press; 51. drainage pipe three; 6. fine separation return water bin; 7. ladder; 8. conveying pump. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0018] See also Figure 1-4 The utility model provides a technical solution: a slurry concentration and water return treatment system, comprising an arc screen 2, a coarse separation water return bin 3, a fiber recovery machine 4, a screw press 5 and a fine separation water return bin 6 provided on a basic support 1, the basic support 1 comprises a bottom plate 11 and a top plate 12, a vertical beam 13 is provided between the bottom plate 11 and the top plate 12; the coarse separation water return bin 3 and the fine separation water return bin 6 are both provided on the bottom plate 11; the bottom plate 11 is also provided with a support seat 14 higher than the coarse separation water return bin 3 and the fine separation water return bin 6, the screw press 5 is provided on the support seat 14; the arc screen 2 and the fiber recovery machine 4 are provided on the top plate 12;

[0019] A drainage pipe 28 is connected between the water outlet of the arc screen 2 and the water inlet of the rough separation return water bin 3, and a slag discharge pipe 27 is connected between the slag outlet of the arc screen 2 and the feed port of the screw press 5; a water inlet pipe 2 41 is connected between the water outlet of the rough separation return water bin 3 and the water inlet of the fiber recovery machine 4, and a conveying pump 8 is connected to the water inlet pipe 2 41; a drainage pipe 2 42 is connected between the water outlet of the fiber recovery machine 4 and the water inlet of the fine separation return water bin 6, and a slag discharge pipe 2 43 is connected between the slag outlet of the fiber recovery machine 4 and the feed port of the screw press 5; a drainage pipe 3 51 is connected between the water outlet of the screw press 5 and the water inlet of the rough separation return water bin 3;

[0020] Working principle:

[0021] The return water is coarsely powdered through the curved screen 2, and the screened material of the curved screen 2 is the pre-dehydrated fiber slurry, which is sent to the screw press 5 through the slag discharge pipe 27; the water separated under the curved screen 2 is sent to the coarse separation return water tank 3 through the drainage pipe 28, and the water in the coarse separation return water tank 3 is sent to the fiber recovery machine 4 through the delivery pump 8 and the water inlet pipe 2 41 for fine separation, and the fiber slurry separated by the fiber recovery machine 4 is sent to the screw press 5 through the slag discharge pipe 2 43, and the water separated by the fiber recovery machine 4 and containing almost no fiber enters the fine separation return water tank 6 through the drainage pipe 2 42 for standby use; the screw press 5 concentrates and dehydrates the fiber slurry screened by the curved screen 2 and the fiber slurry recovered by the fiber recovery machine 4, and the concentrated water of the screw press 5 is returned to the coarse separation return water tank 3 through the drainage pipe 3 51 for circulation treatment; the water in the fine separation return water tank 6 can be reused for flushing and dilution water of this system or flushing and dilution water of the previous stage, and can also be directly discharged into the return water treatment system.

[0022] Furthermore, the arc screen 2 comprises a screen box 21, in which partitions 22 are arranged at equal intervals along the length direction thereof, and the screen box 21 is divided into a plurality of independent screening chambers by the partitions 22, and each screening chamber is provided with an arc screen 23; the top of the screen box 21 is provided with a water inlet pipe 24 at a position corresponding to the screening chamber, the bottom of the screen box 21 is connected to a slag outlet 25 at a slag outlet corresponding to the screening chamber, and a slag outlet pipe 27 is connected to a collecting hopper 26 at the beginning of the slag outlet pipe 27, and the collecting hopper 26 is connected to the collecting hopper 26. The collecting hopper 26 is a square funnel structure, and the slag discharge pipe 25 is connected to the collecting hopper 26; the bottom end of the screen box 21 is connected to a water outlet pipe at the water outlet of the corresponding screening cavity, and the water outlet pipes connected to the screening cavity are connected to the starting end of a drain pipe 28; a plurality of independent screening cavities are provided in the arc screen 2 to process the return water, the screening efficiency is high, the screening uniformity effect is good, and the collecting hopper 26 facilitates the fiber slurry screened out by the arc screen 2 to be smoothly discharged into the slag discharge pipe 27.

[0023] Furthermore, a support seat 15 is provided on the top plate 12 at a position corresponding to the arc screen 2, and the arc screen 2 is fixedly arranged on the support seat 15; a U-shaped support seat 16 is provided on the top plate 12 at a position corresponding to the fiber recovery machine 4, and the fiber recovery machine 4 is fixedly arranged on the U-shaped support seat 16; pipeline holes 121 are opened on the top plate 12 at positions corresponding to the slag discharge pipe 27, the drainage pipe 28, the water inlet pipe 41, the drainage pipe 42 and the slag discharge pipe 43, and the pipeline arrangement of the arc screen 2 and the fiber recovery machine 4 is facilitated by the pipeline holes 121.

[0024] Furthermore, a ladder 7 is provided between the bottom plate 11 and the top plate 12 of the basic support 1 , and the ladder 7 is used to facilitate maintenance of the curved screen 2 and the fiber recovery machine 4 .

[0025] The slurry concentration and return water treatment system disclosed in the present embodiment uses the arc screen 2 as a coarse separation device in the return water to quickly and roughly separate the fibers in the return water, and can separate most of the fibers in the return water to relieve the pressure of the subsequent fine separation equipment. The arc screen 2 has no mechanical damage in the process of separating the fibers, and the quality of the fibers can be guaranteed. The fiber recovery machine 4 is used as a fine separation device to ensure that the return water can be used for the front-end process and the full recovery of the fibers. Since the arc screen 2 has removed most of the fibers, the processing pressure of the fiber recovery machine 4 is reduced, and the stability of the operation of the fiber recovery machine 4 is guaranteed. The screw press 5 is used as a concentration device to increase the concentration of the fibers, which is convenient for the storage, transportation and reuse of the fibers. The return water treatment system has a simple structure, a reasonable layout, a high fiber recovery accuracy, and can fully recover the fibers in the return water. The recovered fibers have no mechanical damage and are of good quality, the return water treatment capacity is strong, the system operates stably and reliably, and a large amount of water treatment costs and time can be saved.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pulp concentration and water return treatment system, comprising an arc screen, a coarse separation water return tank, a fiber recovery machine, a screw press and a fine separation water return tank provided on a basic support, characterized in that: A drainage pipe 1 is connected between the water outlet of the arc screen and the water inlet of the coarse separation return water bin, and a slag discharge pipe 1 is connected between the slag outlet of the arc screen and the feed inlet of the screw press; a water inlet pipe 2 is connected between the water outlet of the coarse separation return water bin and the water inlet of the fiber recovery machine, and a conveying pump is connected to the water inlet pipe 2; a drainage pipe 2 is connected between the water outlet of the fiber recovery machine and the water inlet of the fine separation return water bin, and a slag discharge pipe 2 is connected between the slag outlet of the fiber recovery machine and the feed inlet of the screw press; a drainage pipe 3 is connected between the water outlet of the screw press and the water inlet of the coarse separation return water bin.

2. A slurry concentration and water return treatment system according to claim 1, characterized in that: The arc screen includes a screen box, in which partitions are arranged at equal intervals along the length direction, and the screen box is divided into a plurality of independent screening chambers by the partitions, and each screening chamber is provided with an arc screen; a water inlet pipe is arranged at the top of the screen box corresponding to the screening chamber, and a slag discharge pipe is connected to the bottom of the screen box at the slag outlet corresponding to the screening chamber, and a collecting hopper is connected to the starting end of the slag discharge pipe, and the collecting hopper is a square funnel structure, and the slag discharge pipe is connected to the collecting hopper; a water outlet pipe is connected to the bottom of the screen box at the water outlet corresponding to the screening chamber, and the water outlet pipe connected to the screening chamber is connected to the starting end of a drain pipe.

3. A slurry concentration and water return treatment system according to claim 1, characterized in that: The basic support includes a bottom plate and a top plate, and a vertical beam is arranged between the bottom plate and the top plate; the coarse separation return water bin and the fine separation return water bin are both arranged on the bottom plate; the bottom plate is also provided with a support seat one which is higher than the coarse separation return water bin and the fine separation return water bin, and the screw press is arranged on the support seat one; the arc screen and the fiber recovery machine are arranged on the top plate.

4. A slurry concentration and water return treatment system according to claim 3, characterized in that: A second support seat is provided on the top plate at a position corresponding to the arc screen, and the arc screen is fixedly arranged on the second support seat; a U-shaped support seat is provided on the top plate at a position corresponding to the fiber recovery machine, and the fiber recovery machine is fixedly arranged on the U-shaped support seat; pipeline holes are provided on the top plate at positions corresponding to the first slag discharge pipe, the first drainage pipe, the second water inlet pipe, the second drainage pipe and the second slag discharge pipe.

5. A slurry concentration and water return treatment system according to claim 3, characterized in that: A ladder is also provided between the bottom plate and the top plate of the basic support.

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