CN110499659B

CN110499659B - Papermaking system capable of reducing sludge generation

Info

Publication number: CN110499659B
Application number: CN201910792864.4A
Authority: CN
Inventors: 黄志龙; 华连进; 徐洁; 徐军; 董林海; 董斌; 董永明
Original assignee: Hangzhou Lin'an Taoyuan Paper Co ltd
Current assignee: Hangzhou Lin'an Taoyuan Paper Co ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2021-07-27
Anticipated expiration: 2039-08-26
Also published as: CN110499659A

Abstract

The invention discloses a papermaking system for reducing sludge generation, which relates to the technical field of papermaking, and has the technical scheme that the papermaking system comprises a high-concentration pulping process, a flotation deinking process, a dewatering process, a papermaking process and a retention tank; the retention tank collects waste water generated in a dehydration process and a papermaking process, and the high-concentration pulping process adopts the waste water in the retention tank. The invention has the effects of reducing sludge generated in the papermaking process and lowering the production cost of enterprises.

Description

Papermaking system capable of reducing sludge generation

Technical Field

The invention relates to the technical field of papermaking, in particular to a papermaking system capable of reducing sludge generation.

Background

Trees are used as main raw materials of the paper industry, and the problem of limited original resources is solved through waste paper treatment due to the long growth period of tree resources and the limited existing tree resources. Waste paper processing is the process of reprocessing recycled waste paper to yield acceptable fibers for use in the production of paper products. The recycling of the waste paper is beneficial to protecting the environment, protecting the forest and saving resources. In the production process of paper making by using waste paper, a large amount of sludge is generated, and the sludge contains a large amount of long fibers and short fibers besides impurities, microorganisms and organic matters. The paper making enterprises need to convey the sludge to other enterprises for treatment, so that the conveying cost is high, and other enterprises need to collect certain sludge treatment cost, and how to reduce the sludge generated in the paper making process and reduce the production cost of the enterprises is a subject to be researched.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a papermaking system capable of reducing sludge generation, which can reduce sludge generated in the papermaking process and reduce the production cost of enterprises.

In order to achieve the purpose, the invention provides the following technical scheme: a papermaking system for reducing sludge production comprises a high-concentration pulping process, a flotation deinking process, a dewatering process, a papermaking process and a retention tank; the retention tank collects waste water generated in a dehydration process and a papermaking process, and the high-concentration pulping process adopts the waste water in the retention tank.

Through adopting above-mentioned technical scheme, the fibre is contained in the waste water that dehydration process and papermaking process produced, the waste water that will dewater process and papermaking process produced adds high enriched pulping process, can utilize the fibre in the waste water, reduce fibrous waste, thereby reduce and enter into sewage station internal fiber, one of fibre crop sewage station mud composition, the quality of the fibre that enters into the sewage station reduces, thereby make the final mud of discharging of sewage station, carry out cyclic utilization to waste water simultaneously, the water economy resource.

The invention is further configured to: the flotation deinking process adopts a flotation deinking machine, the flotation deinking machine carries out continuous multi-stage flotation deinking on the paper pulp before the dehydration process, and the floated ink is divided into first-stage ink and second-stage ink; the two-stage ink is filtered and then is introduced into a staying tank.

By adopting the technical scheme, a part of fibers can be brought out in the flotation deinking process, more ink in the first section of ink is not easy to recycle, less ink in the second section of ink is used, and the fibers in the part of ink are utilized, so that the utilization rate of the fibers can be further improved, and the discharge of sludge is reduced.

The invention is further configured to: the flotation deinking machine comprises a machine body, a liquid inlet arranged at one side of the machine body, a liquid outlet arranged at the bottom end of the machine body, an air pump fixed at one side of the machine body, a flow baffle fixed in the machine body and an ink collecting groove arranged at the top end of the machine body; the top end of the machine body is provided with an ink discharging port; the air pump is communicated with an air pipe which penetrates into the machine body and ventilates the machine body; the flow baffle comprises an upper flow baffle and a lower flow baffle which are distributed in a staggered manner; a slot is fixed on the side wall of the ink collecting groove, and a baffle is inserted in the slot; the first section of ink and the second section of ink are respectively positioned on two sides of the baffle.

By adopting the technical scheme, the baffle separates the ink after different levels of flotation, the ink after the first levels (generally 3-5) of flotation is directly introduced into the sewage station, and the ink selected by the later levels of flotation recycles the fibers, so that the utilization rate of the fibers is improved, and the waste of the fibers is reduced.

The invention is further configured to: the number of the slots is a plurality, and the slots are overlapped with the upper flow baffle in the vertical direction.

Through adopting above-mentioned technical scheme, the quantity of slot is a plurality of, and the baffle of being convenient for inserts in the slot of difference to be convenient for adjust the flotation progression of one section black, be convenient for adjust the flotation condition of one section black according to the production conditions of reality.

The invention is further configured to: an ink outlet is also formed in the side edge of the ink collecting groove and is positioned on one side, close to the liquid inlet, of the inserting groove, and a blocking plug is inserted into the ink outlet.

Through adopting above-mentioned technical scheme, the ink outlet is located the one side that the slot is close to the inlet, and when the baffle inserted different slots in, open different ink outlets, be convenient for discharge the printing ink in the collection china ink groove.

The invention is further configured to: and a filtering device for filtering the two-stage ink is arranged before the dehydration process.

By adopting the technical scheme, the filtering device filters the ink in the two-stage ink, the fiber is reserved, and the content of the ink in the fiber is reduced.

The invention is further configured to: the filtering device comprises a sewage tank, a plurality of hexagonal sieves rotationally connected to the sewage tank, a pulp inlet pipe communicated with the hexagonal sieves, a paper pulp tank arranged on the other side of the pulp inlet pipe and a driving piece driving the hexagonal sieves to rotate; the pulp inlet pipe is communicated with one end of the ink collecting groove, which is internally provided with two sections of ink.

Through adopting above-mentioned technical scheme, in the hexagonal sieve was entered into from the one end of hexagonal sieve to two-stage ink, the hexagonal sieve rotated, and printing ink filters out from the nylon wire, and the fibre is stayed in the hexagonal sieve to enter into the paper pulp pond, wait for recycling, be convenient for recycle spacing in the two-stage ink.

In conclusion, the beneficial technical effects of the invention are as follows:

1. the waste water generated in the dehydration process and the papermaking process contains fibers, and the waste water generated in the dehydration process and the papermaking process is added into the high-concentration pulping process, so that the fibers in the waste water can be utilized, the waste of the fibers is reduced, the fibers entering a sewage station are reduced, one of the components in the sludge of the sewage station of fiber crops is reduced, the quality of the fibers entering the sewage station is reduced, the sludge finally discharged by the sewage station is enabled, meanwhile, the waste water is recycled, and the water resource is saved;

2. a part of fibers can be brought out in the flotation deinking procedure, more ink in the first-stage ink is not easy to recycle, and less ink in the second-stage ink is used, so that the utilization rate of the fibers can be further improved, and the discharge of sludge is reduced;

3. the baffle separates the ink after different levels of flotation, the ink after the first levels (generally 3-5) of flotation is directly introduced into a sewage station, and the ink separated by the later levels of flotation recycles the fibers, so that the utilization rate of the fibers is improved, and the waste of the fibers is reduced.

Drawings

FIG. 1 is a schematic overall flow chart of the embodiment;

FIG. 2 is a schematic diagram of the overall structure of a flotation deinking machine;

FIG. 3 is a cross-sectional view of a flotation deinking machine;

fig. 4 is a schematic structural view of the filter device.

In the figure: 1. a high-concentration pulping process; 2. flotation deinking working procedure; 21. a body; 211. an ink discharge port; 22. a liquid inlet; 23. a liquid outlet; 24. an air pump; 241. a breather pipe; 25. a flow baffle plate; 251. an upper baffle plate; 252. a lower baffle plate; 26. an ink collecting groove; 261. a slot; 262. a baffle plate; 263. an ink outlet; 264. blocking the plug; 3. a dehydration step; 31. a sewage tank; 32. a hexagonal sieve; 321. a nylon mesh; 322. a motor; 323. a belt linkage mechanism; 33. a pulp inlet pipe; 34. a pulp tank; 4. a retention tank; 5. a sewage station; 6. and (5) a papermaking process.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): a paper making system with reduced sludge production, as shown in figure 1, waste paper processing requires the following steps: a high concentration pulping step 1, a flotation deinking step 2, and a dewatering step 3.

In the high-concentration pulping step 1, water is added to the waste paper through a high-concentration pulper to crush the waste paper, thereby converting the waste paper into pulp. A large amount of paper fibers and ink exist in the paper pulp, and the quality of the subsequently processed paper is affected by the large amount of ink, so that the ink needs to be cleaned. The paper enters the flotation deinking process 2. The pulp is diluted by adding a large amount of water to the pulp before it is subjected to flotation deinking 2.

The diluted paper pulp is subjected to multiple flotations in the flotation deinking procedure 2 and is divided into first-stage ink and second-stage ink. The ink of one ink segment is thick and difficult to discharge into the sewage station 5; the amount of ink in the second stage ink is small and certain paper fibers exist, and the second stage ink can be discharged into the retention tank 4 for reuse.

After the flotation deinking step 2, the pulp is dewatered through a dewatering step 3 after removing the ink present in the pulp. The dewatering process 3 adopts a multi-disc dewatering machine, and the diluted paper pulp enters a paper making process 6 of a paper machine after being diluted in the multi-disc dewatering machine.

The two-stage ink floated and separated in the flotation deinking process 2 has less ink amount and certain paper fiber, and is discharged into the retention tank 4 for reuse. Part of the pulp fibers remain in the water removed in the dewatering step 3 and are discharged into the retention tank 4 for reuse. The water containing pulp fibres is also removed from the paper making process 6 and is likewise discharged into the retention tank 4. The water in the retention tank 4, in which a certain proportion of the fibres are present, is discharged directly to the sewage station, where the treatment of the sewage station causes the fibres to be deposited in the form of sludge.

Therefore, the water in the retention tank 4 is used for diluting the paper pulp after the high-concentration pulping process 1, the limit in the water in the retention tank 4 can be reused, and the utilization rate of the limit is improved, so that the fiber discharged into the sewage station is reduced, and the sludge in the sewage station is reduced. And improves the utilization rate of water.

Referring to fig. 2 and 3, the flotation deinking machine includes a machine body 21, a liquid inlet 22 disposed at one side of the machine body 21, a liquid outlet 23 disposed at the bottom end of the machine body 21, an air pump 24 fixed at one side of the machine body 21, a flow baffle 25 fixed inside the machine body 21, and a collecting tank 26 disposed at the top end of the machine body 21.

The air pump 24 is communicated with an air pipe 241 penetrating into the machine body 21, the air pipe 241 is provided with a plurality of air holes, the air pipe 241 ventilates the machine body 21, and the ink in the paper pulp floats to the top end of the machine body 21 along with the air bubbles.

The baffle 25 includes upper baffles 251 and lower baffles 252, and the upper baffles 251 and the lower baffles 252 are distributed alternately. The top end of the upper baffle 251 is fixed on the top end inside the machine body 21, and a gap is formed between the lower end of the upper baffle 251 and the machine body 21 for diluted paper pulp to pass through; the bottom end of the lower baffle 252 is fixed to the inner end of the machine body 21, and a gap is formed between the upper end of the lower baffle and the machine body 21 for the diluted paper pulp to pass through. Between every two adjacent upper baffles 251, a deinking chamber is formed, and a segment of ink generally passes through 3-5 deinking chambers.

The top end of the body 21 is disposed obliquely, and the top end of the body 21 is provided with an ink outlet 211. The insertion grooves 261 are fixed to both sides of the ink collecting groove 26, and the insertion grooves 261 are vertically overlapped with the upper baffle plate 251. A baffle 262 is inserted into the slot 261 and divides the ink collecting tank 26 into two parts, one section of ink is in the end close to the liquid inlet 22 and the other section of ink is in the end far away from the liquid inlet 22. An ink outlet 263 is further formed in the side edge of the ink collecting groove 26, the ink outlet 263 is located on one side of the insertion groove 261 close to the liquid inlet 22, a blocking plug 264 is inserted into the ink outlet 263, and the blocking plug 264 blocks the ink outlet 263.

When in use, the diluted paper pulp enters the interior of the machine body 21 from the liquid inlet 22, multi-step flotation deinking is carried out in the interior of the machine body 21, the ink floated from the first few cloths is a section of ink with more ink content, and the ink is directly discharged into the sewage station 5; the ink floated in the subsequent steps is two-stage ink with low ink content and high fiber content, and the ink is discharged to the next step for reuse.

The second-stage ink after flotation needs to be filtered by a filtering device to further reduce the ink content in the second-stage ink. Referring to fig. 4, the filtering apparatus includes a sump 31, a plurality of hexagonal sieves 32 rotatably coupled to the sump 31, a pulp inlet pipe 33 communicating with the hexagonal sieves 32, and a pulp tank 34 disposed at the other side of the pulp inlet pipe 33. The slurry inlet pipe 33 is communicated with one end of the ink collecting groove 26 filled with two sections of ink.

The nylon net 321 is wound on the hexagonal screen 32, the fiber in the two-stage ink is difficult to enter the pulp tank 34 from the other end of the hexagonal screen 32 through the nylon net 321, and then enters the dehydration process 3 from the pulp tank 34 for dehydration, and the sewage with the ink enters the sewage tank 31 and enters the sewage station 5 from the sewage tank 31. The two ends of the hexagonal sieve 32 are respectively provided with a motor 322 and a belt interlocking mechanism 323, which drive the plurality of hexagonal sieves 32 to interlock.

The process flow comprises the following steps: the waste paper is crushed and diluted in the high-concentration pulping process 1, the diluted paper pulp enters the flotation deinking process 2 for flotation deinking, and then the paper pulp enters the dewatering process 3 for dewatering, and after the required concentration is reached, the paper pulp is added to a paper making process 6 of a paper machine. In the dewatering process 3, the flotation deinking process 2 and the papermaking process 6, fiber-containing wastewater is generated and is introduced into the retention tank 4 for temporary storage and used in a high-concentration pulping process, so that the fiber discharge and waste are reduced, and the sludge is reduced.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A papermaking system for reducing sludge production is characterized in that: comprises a high-concentration pulping process (1), a flotation deinking process (2), a dewatering process (3), a papermaking process (6) and a retention tank (4); the retention tank (4) collects waste water generated in the dehydration process (3) and the papermaking process (6), and the high-concentration pulping process (1) adopts the waste water in the retention tank (4); the flotation deinking procedure (2) adopts a flotation deinking machine, the flotation deinking machine carries out continuous multi-stage flotation deinking on the paper pulp before the dehydration procedure (3), and the floated ink is divided into first-stage ink and second-stage ink; the second-stage ink is filtered and then is introduced into a retention tank (4);

the flotation deinking machine comprises a machine body (21), a liquid inlet (22) arranged on one side of the machine body (21), a liquid outlet (23) arranged at the bottom end of the machine body (21), an air pump (24) fixed on one side of the machine body (21), a flow baffle plate (25) fixed in the machine body (21) and an ink collecting groove (26) arranged at the top end of the machine body (21); the top end of the machine body (21) is provided with an ink discharging port (211); the air pump (24) is communicated with a vent pipe (241) which penetrates into the machine body (21) and ventilates the interior of the machine body (21); the flow baffle plates (25) comprise upper flow baffle plates (251) and lower flow baffle plates (252) which are distributed in a staggered mode; a slot (261) is fixed on the side wall of the ink collecting groove (26), and a baffle (262) is inserted in the slot (261); the first section of ink and the second section of ink are respectively positioned on two sides of the baffle (262);

the number of the slots (261) is several, and the slots (261) are overlapped with the vertical direction of the upper baffle plate (251);

an ink outlet (263) is further formed in the side edge of the ink collecting groove (26), the ink outlet (263) is located on one side, close to the liquid inlet (22), of the inserting groove (261), and a blocking plug (264) is inserted into the ink outlet (263).

2. The sludge production reducing papermaking system according to claim 1, wherein: and a filtering device for filtering the two-stage ink is arranged before the dehydration process (3).

3. The sludge production reducing papermaking system according to claim 2, wherein: the filtering device comprises a sewage tank (31), a plurality of hexagonal sieves (32) rotatably connected to the sewage tank (31), a pulp inlet pipe (33) communicated with the hexagonal sieves (32), a pulp tank (34) arranged on the other side of the pulp inlet pipe (33) and a driving piece driving the hexagonal sieves (32) to rotate; the pulp inlet pipe (33) is communicated with one end of the ink collecting groove (26) filled with two sections of ink; the hexagonal screen (32) is wound with a nylon net (321).