A papermaking white water fiber recovery filter

Abstract

The invention discloses a papermaking white water fiber recovery filter, comprising a box body, a first partition connecting a left plate and a right plate is arranged in the box body, the rear side of the first partition is an air flotation area, and the front side is a fiber filtration area; the air flotation area is used to mix white water with dissolved air water to improve the air flotation effect of fiber in the white water so that the fiber floats to the water surface, and the fiber filtration area is used to collect the fiber after air flotation. The papermaking white water fiber recovery filter of the technical solution of the invention can complete the processes of air flotation, filtration, cleaning and the like of white water treatment at one time, and has the advantages of high equipment integration, high degree of automation, small space occupation, etc.

Description

Technical Field

[0001] The invention relates to the field of papermaking white water treatment equipment, in particular to a papermaking white water fiber recovery filter. Background Art

[0002] White water is a large amount of water discharged from the paper machine mesh during papermaking. It contains fine short fibers and other substances added to the pulp, and is named for its white color. The white water produced in the papermaking process contains a large amount of fine fibers and chemical residues. Enterprises spend a lot of money on discharging industrial wastewater, pulp recovery and sewage treatment, which is a huge expense in terms of material and financial resources. At present, most papermaking companies use multiple equipment to treat white water. First, the white water is flotated to allow the fibers to absorb more tiny bubbles and float on the liquid surface, and then the fibers are cleaned up by salvaging equipment. This method has many equipment, occupies a large plant space, and requires more workers to participate. Summary of the invention

[0003] In order to solve the above technical problems, the main purpose of the present invention is to provide a papermaking white water fiber recovery filter, which can float the papermaking white water and filter out the fibers, thereby treating the white water cleanly at one time.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions to solve it.

[0005] A papermaking white water fiber recovery filter comprises a box body, wherein a first partition connecting a left plate and a right plate is arranged in the box body, the rear side of the first partition is an air flotation zone, and the front side is a fiber filtration zone; the air flotation zone is used to mix white water with dissolved air water to improve the air flotation effect of fiber in the white water so that the fiber floats to the water surface, and the fiber filtration zone is used to collect the fiber after air flotation.

[0006] Furthermore, the flotation area includes a mixed water tank, which is arranged on the bottom plate of the box body, a mixed water outlet is arranged at the bottom of the left side plate of the mixed water tank, a releaser is arranged in the mixed water tank, and a white water inlet is arranged at the bottom of the mixed water tank; the first partition is lower than the left side plate of the box body, and a clarified liquid outlet is arranged near the top of the first partition.

[0007] Furthermore, the releaser comprises a dissolved air water pipe, a gas diversion pipe is arranged on the upper part of the dissolved air water pipe, and air outlet holes are respectively arranged on the front and rear sides of the gas diversion pipe.

[0008] Furthermore, the first baffle is arranged at an angle, and the mixing water tank is arranged close to the first baffle; and the releaser is located at the rear side of the white water inlet.

[0009] Furthermore, it also includes a plurality of guide plates, which connect the left plate and the right plate, and each guide plate is parallel to the right plate.

[0010] Furthermore, the fiber filtration area is provided with a clear liquid bin, which is provided with a clear liquid outlet; a filter cartridge is provided above the clear liquid bin, which includes a rotating shaft, which is connected to spokes, and a filter screen is provided on the spokes; the left side plate of the rotating shaft extending out of the box is connected to a motor, and the motor drives the filter cartridge to rotate clockwise; the highest point of the filter cartridge is higher than the top of the first partition plate; a second partition plate connecting the left side plate and the right side plate is vertically provided in front of the filter cartridge, and the extension line of the second partition plate is tangent to the filter cartridge, and the second partition plate and the right side plate form a collection bin for collecting fiber materials; a lip plate is provided between the filter cartridge and the first partition plate, and the lip plate is used to block the fiber materials from entering the clear liquid bin.

[0011] Furthermore, a scraper plate is arranged in front of the filter cartridge, the scraper plate is tilted upward and pressed against the outer surface of the filter screen, a normal pressure stripping water pipe is arranged above the scraper plate, and a plurality of fan-shaped wide-angle nozzles tilted upward and pointing toward the filter screen are arranged on the normal pressure stripping water pipe.

[0012] Furthermore, a high-pressure cleaning water pipe is arranged below the front side of the filter cartridge, and a plurality of needle-shaped nozzles facing the filter cartridge are arranged on the high-pressure cleaning water pipe.

[0013] Furthermore, it also includes a negative pressure fan, which is arranged outside the box body, and the suction pipe of the negative pressure fan extends into the filter cartridge.

[0014] The papermaking white water fiber recovery filter of the technical solution of the present invention can complete the flotation, filtration, cleaning and other processes of white water treatment at one time, and has the advantages of high equipment integration, high degree of automation, small space occupation, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A three-dimensional schematic diagram of an embodiment of a papermaking white water fiber recovery filter according to the present invention from one viewing angle;

[0017] Figure 2 It is a three-dimensional schematic diagram of another viewing angle of an embodiment of the papermaking white water fiber recovery filter of the present invention;

[0018] Figure 3 It is a cross-sectional view of the papermaking white water fiber recovery filter of the present invention;

[0019] Figure 4 This is an enlarged view of the releaser;

[0020] In the above picture:

[0021] 1 box body; 2 first partition;

[0022] 3 air flotation area; 301 water mixing chamber; 302 mixed water outlet; 303 releaser; 3031 dissolved air water pipe; 3032 gas diversion pipe; 3033 air outlet; 304 white water inlet; 305 clarified liquid outlet; 306 guide plate;

[0023] 4 fiber filtration area; 401 clear liquid bin; 402 filter cartridge; 403 motor; 404 aggregate bin;

[0024] 405 scraper; 406 normal pressure stripping water pipe; 407 high pressure cleaning water pipe; 408 lip plate;

[0025] 5. Second partition; 6. Negative pressure fan. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the following description, specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] White water is a large amount of water discharged from the paper machine mesh during papermaking. It contains fine short fibers and other substances added to the pulp. It is named for its white color. The working principle of air flotation white water treatment is to dissolve air in water under a certain pressure as a working medium, and then release it through a specific releaser immersed in the treated white water under sudden decompression, generating countless fine bubbles, which adhere to the impurity particles in the white water after the condensation reaction, making its density less than that of water, and float on the water surface, becoming scum and being removed, so that the white water is purified. Air flotation treatment of white water is currently a reuse technology that is widely used in white water reuse.

[0029] The existing white water treatment generally uses air flotation equipment to first flotate the white water, and then filters and recovers the flotated fibers, which requires multiple devices and wastes plant space. The present invention provides a white water fiber recovery filter that integrates physical flotation and fiber recovery, which can treat white water at one time to obtain clean water that meets the standards.

[0030] refer to Figure 1 , Figure 2 and Figure 3A papermaking white water fiber recovery filter comprises a box body 1, wherein a first partition plate 2 connecting a left side plate and a right side plate is arranged in the box body 1, the rear side of the first partition plate 2 is an air flotation area 3, and the front side is a fiber filtration area 4; the air flotation area 3 is used to mix white water with dissolved air water to improve the air flotation effect of fiber in the white water so that the fiber floats to the water surface, and the fiber filtration area 4 is used to collect the fiber after air flotation.

[0031] In the above embodiments, a first partition plate 2 is arranged in the box body 1 , the rear side of the first partition plate 2 is an air flotation area 3 , and the front side is a fiber filtering area 4 .

[0032] For further reference, Figure 3 The flotation zone 3 includes a mixed water tank 301, which is arranged on the bottom plate of the box body 1, and a mixed water outlet 302 is arranged at the bottom of the left side plate of the mixed water tank 301. A releaser 303 is arranged in the mixed water tank 301, and a white water inlet 304 is arranged at the bottom of the mixed water tank 301; the first partition plate 2 is lower than the left side plate of the box body 1, and a clarified liquid outlet 305 is arranged near the top of the first partition plate 2.

[0033] refer to Figure 4 The releaser 303 comprises a dissolved air water pipe 3031, a gas diversion pipe 3032 is arranged on the upper part of the dissolved air water pipe 3031, and gas outlet holes 3033 are respectively arranged on the front and rear sides of the gas diversion pipe 3032.

[0034] In the above embodiment, the mixed water tank 301 is arranged on the bottom plate of the air flotation zone 3, and a releaser 303 is arranged in the mixed water tank 301. A white water inlet 304 is arranged at the bottom of the bottom plate, and a mixed water outlet 302 is arranged at the bottom of the left plate of the air flotation zone 3. The mixed water outlet 302 is usually arranged in a long strip slit. The dissolved air water and the white water are fully mixed in the mixed water tank 301, and flow out from the slit-shaped mixed water outlet 302. Diffusion occurs, and the flow rate slows down. The fine fibers in the white water fully absorb the tiny bubbles in the dissolved air water, and the liquid level gradually rises. The fiber objects float on the uppermost layer. As the dissolved air water and the white water continue to enter, the liquid level in the air flotation zone 3 rises. When the liquid level rises to the clarified liquid outlet 305 of the first partition plate 2, since the clarified liquid outlet 305 is arranged on the first partition plate 2, the mixed water will flow out from the clarified liquid outlet 305. By controlling the inflow of white water per unit time to be greater than the outflow of clarified liquid per unit time, the liquid level in the flotation zone 3 will continue to rise until the liquid level is flush with the first baffle 2, and the clarified liquid outlet 305 is located below the liquid surface, so that the clarified liquid can be discharged stably, while the fibers floating on the upper layer flow to the filtration zone to be filtered and recovered.

[0035] Preferably, the first baffle 2 is tilted, the mixing water chamber 301 is close to the first baffle 2, and the releaser 303 is located at the rear side of the white water inlet 304. It also includes a plurality of guide plates 306, which connect the left plate and the right plate, and each guide plate 306 is parallel to the right plate.

[0036] By providing the inclined first partition plate 2 and the guide plate 306, the path of the mixed water in the physical water mixing area is extended, and the suspension effect of the mixed water can be improved.

[0037] For further reference, Figure 2 The fiber filtration area 4 is provided with a liquid clearing bin 401, and the liquid clearing bin 401 is provided with a liquid clearing outlet; a filter cartridge 402 is provided above the liquid clearing bin 401, and the filter cartridge 402 includes a rotating shaft, and spokes are connected to the rotating shaft, and a filter screen is provided on the spokes; the rotating shaft extends out of the left side plate of the box body 1 and is connected to a motor 403, and the motor 403 drives the filter cartridge 402 to rotate clockwise; the highest point of the filter cartridge 402 is higher than the top of the first partition 2; a second partition 5 connecting the left side plate and the right side plate is vertically provided in front of the filter cartridge 402, and the extension line of the second partition 5 is tangent to the filter cartridge 402, and the second partition 5 and the right side plate form a collection bin 404 for collecting fiber matter. A lip plate 408 is provided between the filter cartridge 402 and the first partition 2, and the lip plate 408 is used to prevent the fiber matter from entering the liquid clearing bin 401.

[0038] In the above embodiment, the clarified liquid in the flotation zone 3 flows from the clarified liquid outlet 305 to the fiber filtering zone. Since the lip plate 408 is provided between the filter cartridge 402 and the second partition plate 5, the liquid level between the filter cartridge 402 and the second partition plate 5 will also rise. When the water intake and clarified liquid discharge of the entire system reach a balance, at this time, the fiber on the upper layer of the flotation zone 3 can pass over the top of the second partition plate 5 and be taken away by the filter cartridge 402 rotating clockwise, and the excess clarified liquid passes through the filter screen and enters the clear liquid bin 401. As the filter cartridge 402 rotates, the fiber falls into the collection bin 404 under the action of gravity and is hit and discharged.

[0039] Preferably, a scraper plate 405 is provided in front of the filter cartridge 402, and the scraper plate 405 is tilted upward and pressed against the outer surface of the filter screen. A normal pressure stripping water pipe 406 is provided above the scraper plate 405, and the normal pressure stripping water pipe 406 is provided with multiple fan-shaped wide-angle nozzles tilted upward and pointing to the filter screen.

[0040] In the above embodiment, a normal pressure stripping water pipe 406 is provided above the scraper plate 405 to strip the fibers in advance so as to facilitate the scraping of the scraper plate 405. The normal pressure stripping water pipe 406 uses a fan-shaped wide-angle nozzle to cover the entire filter cartridge 402. As the filter cartridge 402 rotates clockwise, the scraper plate 405 tilts upward and rests against the filter screen on the outer surface of the filter cartridge 402, which can completely remove the fibers on the filter screen.

[0041] In order to remove the residual fibers on the filter screen, a high-pressure cleaning water pipe 407 is provided at the lower front side of the filter cartridge 402. The high-pressure cleaning water pipe 407 is provided with a plurality of needle-shaped nozzles facing the filter cartridge 402. The needle-shaped nozzles can ensure the pressure of the cleaning water.

[0042] Furthermore, it also includes a negative pressure fan 6, which is arranged outside the box body 1, and the suction pipe of the negative pressure fan 6 extends into the filter cartridge 402. The negative pressure fan 6 improves the permeability of the filter screen, making it easier for fibers to be adsorbed on the filter screen.

[0043] Although the present invention has been described in detail in this specification by means of general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto on the basis of the present invention. Therefore, these modifications or improvements made without departing from the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A papermaking white water fiber recovery filter, characterized in that: The invention comprises a box body (1), wherein a first partition plate (2) connecting a left side plate and a right side plate is arranged inside the box body (1), the rear side of the first partition plate (2) is an air flotation area (3), and the front side is a fiber filtration area (4); the air flotation area (3) is used to mix white water with dissolved air water to improve the air flotation effect of fiber matter in the white water so that the fiber matter floats to the water surface, and the fiber filtration area (4) is used to collect the fiber matter after air flotation; the air flotation area (3) comprises a water mixing chamber (301), and the water mixing chamber (301) is arranged on the bottom plate of the box body (1). The left side plate of the housing (301) is provided with a mixed water outlet (302) at the bottom, and the mixed water outlet (302) is configured as a long strip-shaped slit; a releaser (303) is provided in the mixed water chamber (301), and a white water inlet (304) is provided at the bottom of the mixed water chamber (301); the first partition plate (2) is lower than the left side plate of the housing (1), and a clarified liquid outlet (305) is provided near the top of the first partition plate (2); the first partition plate (2) is arranged obliquely, and the mixed water chamber (301) is arranged close to the first partition plate (2); the fiber The filtration area (4) is provided with a clear liquid bin (401), and the clear liquid bin (401) is provided with a clear liquid outlet; a filter cartridge (402) is provided above the clear liquid bin (401), and the filter cartridge (402) comprises a rotating shaft, and spokes are connected to the rotating shaft, and a filter screen is provided on the spokes; the rotating shaft extends out of the left side plate of the box body (1) and is connected to a motor (403), and the motor (403) drives the filter cartridge (402) to rotate clockwise; the highest point of the filter cartridge (402) is higher than the top of the first partition plate (2); the front of the filter cartridge (402) is vertically A second partition plate (5) is provided connecting the left plate and the right plate, the extension line of the second partition plate (5) is tangent to the filter cartridge (402), and the second partition plate (5) and the right plate form a collection bin (404) for collecting fiber matter; a lip plate (408) is provided between the filter cartridge (402) and the first partition plate (2), and the lip plate (408) is used to block the fiber matter from entering the clear liquid bin (401); a scraper plate (405) is provided in front of the filter cartridge (402), and the scraper plate (405) is tilted upward and pressed against the outer surface of the filter screen.

2. The papermaking white water fiber recovery filter according to claim 1, characterized in that: The releaser (303) comprises a dissolved air water pipe (3031), a gas diversion pipe (3032) is arranged on the upper part of the dissolved air water pipe (3031), and gas outlet holes (3033) are respectively arranged on the front and rear sides of the gas diversion pipe (3032).

3. The papermaking white water fiber recovery filter according to claim 1, characterized in that: The releaser (303) is located at the rear side of the white water inlet (304).

4. The papermaking white water fiber recovery filter according to claim 1, characterized in that: A normal-pressure stripping water pipe (406) is arranged above the scraper plate (405), and a plurality of fan-shaped wide-angle nozzles inclined upward and pointing toward the filter screen are arranged on the normal-pressure stripping water pipe (406).

5. The papermaking white water fiber recovery filter according to claim 1, characterized in that: A high-pressure cleaning water pipe (407) is provided below the front side of the filter cartridge (402), and a plurality of needle-shaped nozzles facing the filter cartridge (402) are provided on the high-pressure cleaning water pipe (407).

6. The papermaking white water fiber recovery filter according to claim 1, characterized in that: It also comprises a negative pressure fan (6), wherein the negative pressure fan (6) is arranged outside the box body (1), and the air suction pipe of the negative pressure fan (6) extends into the filter cartridge (402).

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