Internal fibers for improving the efficiency of a circulating water fiber filter and a filter thereof

Abstract

The application discloses an internal fiber for improving the efficiency of a circulating water fiber filter and a filter thereof. The fiber comprises, from outside to inside, a first modified layer, an adsorption layer and a second modified layer. The preparation method of the fiber comprises the following steps: S1, preparation of the first modified layer; S2, preparation of the adsorption layer; S3, preparation of the second modified layer; and S4, preparation of the fiber. The filter matched with the fiber comprises a shell, a manhole and a lifting lug arranged on the top of the shell, a hydraulic control mechanism, an upper hole plate, a lower hole plate and a fiber bundle arranged in the shell, and a cleaning air inlet arranged on the side wall of the shell. The top of the shell is provided with a raw water inlet pipe and an exhaust pipe, and the raw water inlet pipe is provided with a backwashing drainage pipe. The bottom of the shell is provided with a backwashing inlet pipe, and the backwashing inlet pipe is provided with a raw water outlet pipe and a vent pipe. The application improves the filtering efficiency by modifying the fiber, and the position of the manhole in the filter is changed from the traditional lower side to the upper part, so that the installation number of the fiber bundle is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filtration, in particular to an internal fiber for improving the efficiency of a circulating water fiber filter and the filter. BACKGROUND

[0002] The filter pressure difference of the circulating water bypass filter is large, the water treatment capacity is small, and the turbidity of the outlet water is high, and the deposition of suspended solids will affect the cooling effect of the heat exchanger. At present, the internal fiber of the old synthetic fiber filter has not been replaced since 2009, and the internal fiber of the three fiber filters of air separation has not been replaced since 2015, and the normal service life has been exceeded for more than 5-6 years. At present, the overall operation condition is not good, and the effect after alkali foaming is still not ideal. According to the previous investigation, it is found that the internal structure of the fiber filter is relatively thin, the backwashing gas flow is uneven, therefore, the internal fiber of the four devices is prepared to be replaced, and the internal parts are gradually replaced or maintained to be used.

[0003] The suspended solids in the circulating water are adsorbed on the filter material by physical and chemical action, and when the action force is stronger, the suspended solids removal effect is better, but the backwashing is more difficult.

[0004] Therefore, the present application designs an internal fiber for improving the efficiency of a circulating water fiber filter and the filter to improve the above problems. SUMMARY

[0005] To solve the above technical problems, the present application provides an internal fiber for improving the efficiency of a circulating water fiber filter and the filter.

[0006] The technical scheme of the present application is: an internal fiber for improving the efficiency of a circulating water fiber filter, the fiber comprises a first modified layer, an adsorption layer and a second modified layer from outside to inside in sequence;

[0007] The preparation method comprises the following steps:

[0008] S1, preparation of the first modified layer:

[0009] Polypropylene and coupling agent are dissolved in a solvent at 150-160 DEG C to obtain a dissolution solution, then dragon's whisker slurry and chitosan solution are sequentially added to the dissolution solution, and modified treatment is carried out at 60-70 DEG C for 40-50 min to obtain modified spinning solution. The modified spinning solution is divided into three equal parts, and the first part of the modified spinning solution is obtained by wet spinning to obtain the first modified layer;

[0010] The mass ratio of polypropylene, coupling agent and solvent is 1-3:0.2:15, and the addition amount of dragon's whisker slurry and chitosan solution is 20-30wt.% and 10-15wt.% of the dissolution solution, respectively;

[0011] S2, preparation of the adsorption layer:

[0012] Further, at 65-80℃, a pore-forming agent accounting for 3-4% of the mass of the second modified spinning solution is added to the second modified spinning solution obtained in step S1, and stirring is performed for 2.5-4h, and then an adsorption layer is obtained by electrospinning;

[0013] S3, preparation of a second modified layer:

[0014] Nano iron particles with a particle size of 55-350nm are added to the third modified spinning solution obtained in step S1, and the addition amount of the nano iron particles is 1-2wt.% of the third modified spinning solution, and then a second modified layer is obtained by wet spinning;

[0015] S4, preparation of a fiber:

[0016] The first modified layer, the adsorption layer and the second modified layer are heat set at 100-150℃, and then the first modified layer, the adsorption layer and the second modified layer are compounded and reinforced by needle punching to obtain a fiber.

[0017] Further, the solvent is xylene or trichlorobenzene, and the coupling agent is γ-aminopropyltrimethoxysilane.

[0018] It is explained that xylene or trichlorobenzene has strong solubility and moderate evaporation rate; γ-aminopropyltrimethoxysilane can significantly improve the mechanical properties of the fiber surface, and also can improve the high-temperature resistance and ultraviolet resistance of the fiber.

[0019] Further, in steps S1 and S3, the spinning dope temperature of the wet spinning is 110-120℃, and the coagulation bath temperature is 40-50℃.

[0020] It is explained that if the temperature difference between the spinning dope and the coagulation bath is too small, the uniformity of the internal structure of the spinning dope will be affected, and if the temperature difference between the spinning dope and the coagulation bath is too large, the spinning dope cannot be coagulated and formed.

[0021] Further, in step S2, the pore-forming agent includes, by mass fraction, 15-18 parts of calcium carbonate, 2-3 parts of carbon powder and 6-9 parts of aluminum oxide.

[0022] It is explained that calcium carbonate has a large specific surface area, good thermal stability and chemical stability; carbon powder has a large surface area, high porosity, light weight and good thermal stability; has a high specific surface area, a suitable pore structure, a narrow pore size distribution and good surface acidity; mixing the above three materials can improve the pore-forming effect of the pore-forming agent, thereby increasing the number of pores of the fiber and further enhancing the adsorbability of the fiber.

[0023] Further, in step S2, the electrospinning voltage is 13-16 kV, the flow rate of the spinning solution is 0.6-0.8 mL / h, and the receiving distance from the nozzle to the receiving plate is 16-18 cm.

[0024] Description: When the spinning voltage is low, it is difficult to overcome the surface tension of the spinning solution due to the small electric field force, so that the diameter of the nanofiber formed is large; if the electric field strength is too large, it is not conducive to the stretching and splitting of the jet, so that the fiber diameter becomes large and the uniformity becomes poor; the flow rate of the spinning solution affects the stability of the needle droplet and the diameter of the fiber; if the receiving distance is too short, the solvent does not evaporate sufficiently, and then the fused fibers may be formed.

[0025] Further, in step S4, the diameter of the fiber is 0.8-1.5 cm, and the length is 0.8-50 cm.

[0026] Description: When the length-diameter ratio of the fiber is too large, fiber knots are easily formed in the yarn, and when the length-diameter ratio is too small, the yarn is prone to hairiness and poor spinnability.

[0027] Further, in step S4, the needle density of the needle punching method is 950-1050 times / cm 2 .

[0028] Description: If the needle density is too large, the fiber is easily damaged, the fiber strength is reduced, and even the needle is broken; if the needle density is too small, the fiber is loose, the fiber strength is insufficient, and the service life is short.

[0029] The filter with the above-mentioned any one kind of internal fiber for improving the efficiency of the circulating water fiber filter comprises a shell, a manhole and a lifting lug are arranged on the top of the shell and communicate with the inside of the shell, an upper hole plate is arranged in the shell and is in sliding sealing connection with the inner wall of the shell, a lower hole plate is arranged in the shell and is in fixed connection with the inner wall of the shell, and a fiber bundle is arranged between the upper hole plate and the lower hole plate; the two ends of the fiber bundle are fixedly connected with the upper hole plate and the lower hole plate respectively, the fiber bundle is made of 500-10000 fiber bundles, and the lifting lug is fixedly connected with the upper hole plate through a chain; a cleaning air inlet is arranged on the side wall of the shell and communicates with the inside of the shell.

[0030] The top of the shell is provided with a raw water inlet pipe communicating with the inside of the shell and an exhaust pipe for discharging cleaning air, and a backwashing drainage pipe communicating with the inside of the shell is arranged on the raw water inlet pipe; the bottom of the shell is provided with a backwashing inlet pipe communicating with the inside of the shell, and a raw water outlet pipe communicating with the inside of the shell and a vent pipe communicating with the backwashing inlet pipe are arranged on the backwashing inlet pipe.

[0031] Switch valves are arranged on the cleaning air inlet, the exhaust pipe, the raw water inlet pipe, the raw water outlet pipe, the backwashing inlet pipe, the backwashing drainage pipe and the vent pipe.

[0032] Further, the thickness of the upper orifice plate is 10-12mm.

[0033] Explanation: The orifice plate with thickness of 10-12mm is not easy to deform, and the orifice plate with too thin thickness will have gap on the edge after deformation, and the circulating water will directly flow down from the gap, affecting the filtering effect.

[0034] The beneficial effects of the present application are:

[0035] (1) The internal fiber of the fiber filter is modified by adding coupling agent and chitosan solution, the surface groups of the fiber are modified, the specific adsorption of the fiber is enhanced, the toughness and renewability of the fiber are improved by adding the plant fiber horsetail, the porosity of the fiber is improved by adding the pore-forming agent after modification, the adsorption and interception of the pollutants are enhanced, and the adsorption effect of the fiber on heavy metals is enhanced by adding nano iron particles after modification.

[0036] (2) The internal fiber of the fiber filter is modified by adding coupling agent and chitosan solution, the surface groups of the fiber are modified, the specific adsorption of the fiber is enhanced, the toughness and renewability of the fiber are improved by adding the plant fiber horsetail, the porosity of the fiber is improved by adding the pore-forming agent after modification, the adsorption and interception of the pollutants are enhanced, and the adsorption effect of the fiber on heavy metals is enhanced by adding nano iron particles after modification.

[0037] (3) The fiber filter is prepared by matching the fiber of the present application, which further improves the filtering effect of the fiber filter and improves the backwashing efficiency of the suspended matter; and the fiber filter changes the manhole from the traditional side lower part to the upper part, the fiber bundle in the center part can be installed outside the device, and the fiber bundle in the center part can be directly installed into the device, so that the loading capacity of the fiber bundle can reach 7800 bundles, further improving the filtering effect of the fiber filter. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structure diagram of the internal fiber of the fiber filter of the present application;

[0039] Figure 2 is a front view of the fiber filter of the present application;

[0040] Figure 3 is a side view of the fiber filter of the present application;

[0041] Figure 4 is a top view of the fiber filter of the present application;

[0042] Wherein, 1-housing, 11-raw water inlet pipe, 111-raw water outlet pipe, 12-backwashing inlet pipe, 121-backwashing drain pipe, 122-emptying pipe, 13-exhaust pipe, 14-cleaning air inlet, 15-manhole, 2-fiber bundle, 21-upper hole plate, 211-first modification layer, 212-adsorption layer, 213-second modification layer, 22-lifting lug, 23-chain, 24-lower hole plate. DETAILED DESCRIPTION

[0043] The application will be described in further detail below in connection with specific embodiments in order to better illustrate the advantages of the application.

[0044] Embodiment 1

[0045] An internal fiber for improving the efficiency of a circulating water fiber filter, like Figure 1 As shown, the fiber comprises, from outside to inside, a first modification layer 211, an adsorption layer 212, and a second modification layer 213;

[0046] A preparation method thereof comprises the following steps:

[0047] S1, preparation of the first modification layer 211:

[0048] Polypropylene and γ-aminopropyltrimethoxysilane are dissolved in xylene at 155 ℃ to obtain a dissolution solution, then dragon's whisker slurry and chitosan solution are sequentially added to the dissolution solution, and modification treatment is carried out at 65 ℃ for 45 min to obtain a modified spinning solution, the modified spinning solution is divided into three equal parts by mass, and the first part of the modified spinning solution is obtained by wet spinning to obtain the first modification layer 211;

[0049] The mass ratio of the polypropylene, γ-aminopropyltrimethoxysilane, and xylene is 1-3:0.2:15, and the addition amounts of the dragon's whisker slurry and the chitosan solution are 25 wt.% and 12 wt.% of the dissolution solution, respectively;

[0050] S2, preparation of the adsorption layer 212:

[0051] Then, 3.5% of a porogen by mass of the second part of the modified spinning solution is added to the second part of the modified spinning solution obtained in step S1 at 70 ℃, the porogen comprises, by mass fraction: 16 parts of calcium carbonate, 2.5 parts of carbon powder, and 7 parts of aluminum oxide, stirring is carried out for 3 h, and then electrostatic spinning is carried out to obtain the adsorption layer 212;

[0052] The spinning voltage of the electrostatic spinning is 15 kV, the spinning solution flow rate is 0.7 mL / h, and the receiving distance from the spinning hole to the receiving plate is 17 cm;

[0053] S3, preparation of the second modification layer 213:

[0054] The third modified spinning solution obtained in step S1 is added with nano-iron particles with a particle size of 200 nm, and the amount of the nano-iron particles added is 1.5 wt.% of the third modified spinning solution, and a second modified layer 213 is obtained by wet spinning;

[0055] In steps S1 and S3, the temperature of the spinning dope for wet spinning is 115°C, and the temperature of the coagulation bath is 45°C.

[0056] S4, preparation of the fiber:

[0057] The first modified layer 211, the adsorption layer 212 and the second modified layer 213 are heat set at 125°C, and then the first modified layer 211, the adsorption layer 212 and the second modified layer 213 are compounded and reinforced by needle punching, and the needle punching density is 1000 times / cm 2 , to obtain a fiber with a diameter of 1.1 cm and a length of 25 cm.

[0058] Example 2

[0059] The difference between this embodiment and Example 1 is that in step S1, the mass ratio of polypropylene, γ-aminopropyltrimethoxysilane and trichlorobenzene is 1:0.2:15; the addition amounts of the asparagus fern pulp and the chitosan solution are 20 wt.% and 10 wt.% of the dissolving solution, respectively.

[0060] Example 3

[0061] The difference between this embodiment and Example 1 is that in step S1, the mass ratio of polypropylene, γ-aminopropyltrimethoxysilane and dimethylbenzene is 3:0.2:15; the addition amounts of the asparagus fern pulp and the chitosan solution are 30 wt.% and 15 wt.% of the dissolving solution, respectively.

[0062] Example 4

[0063] The difference between this embodiment and Example 1 is that in step S1, the dissolving temperature of the dissolving solution is 150°C, the modification temperature of the modified spinning solution is 60°C, and the time is 40 min.

[0064] Example 5

[0065] The difference between this embodiment and Example 1 is that in step S1, the dissolving temperature of the dissolving solution is 160°C, the modification temperature of the modified spinning solution is 70°C, and the time is 50 min.

[0066] Example 6

[0067] The difference between this embodiment and Example 1 is that in step S2, 3% of the pore-forming agent is added to the second modified spinning solution obtained in step S1.

[0068] Example 7

[0069] The difference between this example and Example 1 is that in step S2, 4% of the second portion of the modified spinning dope obtained in step S1 is added with the pore-forming agent.

[0070] Example 8

[0071] The difference between this example and Example 1 is that in step S2, the pore-forming agent is added at 65°C and stirred for 2.5h.

[0072] Example 9

[0073] The difference between this example and Example 1 is that in step S2, the pore-forming agent is added at 80°C and stirred for 4h.

[0074] Example 10

[0075] The difference between this example and Example 1 is that the pore-forming agent comprises, by mass fraction: 15 parts of calcium carbonate, 3 parts of carbon powder, and 9 parts of aluminum trioxide.

[0076] Example 11

[0077] The difference between this example and Example 1 is that the pore-forming agent comprises, by mass fraction: 18 parts of calcium carbonate, 2 parts of carbon powder, and 6 parts of aluminum trioxide.

[0078] Example 12

[0079] The difference between this example and Example 1 is that in step S2, the electrospinning is performed at a spinning voltage of 13kV, a spinning dope flow rate of 0.6mL / h, and a receiving distance from the spinneret to the receiving plate of 16cm.

[0080] Example 13

[0081] The difference between this example and Example 1 is that in step S2, the electrospinning is performed at a spinning voltage of 16kV, a spinning dope flow rate of 0.8mL / h, and a receiving distance from the spinneret to the receiving plate of 18cm.

[0082] Example 14

[0083] The difference between this example and Example 1 is that in step S3, the third portion of the modified spinning dope obtained in step S1 is added with nano-iron particles with a particle size of 55nm, and the addition amount of the nano-iron particles is 1wt.% of the third portion of the modified spinning dope.

[0084] Example 15

[0085] The difference between this embodiment and embodiment 1 is that in step S3, the third portion of modified spinning solution obtained in step S1 is added with nano-iron particles with a particle size of 350 nm, and the addition amount of nano-iron particles is 2 wt.% of the third portion of modified spinning solution.

[0086] Embodiment 16

[0087] The difference between this embodiment and embodiment 1 is that in step S1 and step S3, the temperature of the spinning dope for wet spinning is 110℃, and the temperature of the coagulation bath is 50℃.

[0088] Embodiment 17

[0089] The difference between this embodiment and embodiment 1 is that in step S1 and step S3, the temperature of the spinning dope for wet spinning is 120℃, and the temperature of the coagulation bath is 40℃.

[0090] Embodiment 18

[0091] The difference between this embodiment and embodiment 1 is that in step S4, heat setting is performed at 100℃, and the needle punching density is 950 times / cm 2 .

[0092] Embodiment 19

[0093] The difference between this embodiment and embodiment 1 is that in step S4, heat setting is performed at 150℃, and the needle punching density is 1050 times / cm 2 .

[0094] Embodiment 20

[0095] The difference between this embodiment and embodiment 1 is that the diameter of the fiber is 0.8 cm, and the length is 50 cm.

[0096] Embodiment 21

[0097] The difference between this embodiment and embodiment 1 is that the diameter of the fiber is 1.5 cm, and the length is 0.8 cm.

[0098] Embodiment 22

[0099] This embodiment is an optimization of the structure of the fiber filter based on embodiment 1:

[0100] For example, Figure 2 and Figure 3As shown, the fiber filter comprises a shell 1, the shell 1 is provided with a manhole 15 and a lifting lug 22 at the top thereof, the manhole 15 is in communication with the interior of the shell 1, the shell 1 is internally provided with an upper hole plate 21 which is in sliding sealing connection with the inner wall of the shell 1, a lower hole plate 24 which is in fixed connection with the inner wall of the shell 1, and a fiber bundle 2 which is arranged between the upper hole plate 21 and the lower hole plate 24, the fiber bundle 2 is fixedly connected with the upper hole plate 21 and the lower hole plate 24 at both ends thereof, the fiber bundle 2 is made of 6000 fiber bundles, the lifting lug 22 is fixedly connected with the upper hole plate 21 through a chain 23, the side wall of the shell 1 is provided with a cleaning air inlet 14 which is in communication with the interior of the shell 1, and the thickness of the upper hole plate 21 is 11 mm.

[0101] The top of the shell 1 is provided with a raw water inlet pipe 11 which is in communication with the interior of the shell 1 at one end, and an exhaust pipe 13 for discharging cleaning air, the raw water inlet pipe 11 is provided with a backwashing drainage pipe 121 which is in communication with the interior of the shell 1, the bottom of the shell 1 is provided with a backwashing inlet pipe 12 which is in communication with the interior of the shell 1, the backwashing inlet pipe 12 is provided with a raw water outlet pipe 111 which is in communication with the interior of the shell 1, and a vent pipe 122 which is in communication with the backwashing inlet pipe 12.

[0102] The cleaning air inlet 14, the exhaust pipe 13, the raw water inlet pipe 11, the raw water outlet pipe 111, the backwashing inlet pipe 12, the backwashing drainage pipe 121 and the vent pipe 122 are all provided with a switch valve.

[0103] The working principle of the above-mentioned fiber filter is as follows: raw water is introduced into the interior of the shell 1 from the raw water inlet pipe 11 from top to bottom, the gravity makes the upper hole plate 21 move downward, the chain 23 sinks to the longest, and the raw water is filtered in sequence through the upper hole plate 21, the fiber bundle 2 and the lower hole plate 24, and then discharged from the raw water outlet pipe 111 which is in communication with the backwashing inlet pipe 12; the flow direction of the clean water is the same as that of the raw water during the positive flushing;

[0104] After the filtration is completed, the shell 1 is backwashed, clean water is introduced into the interior of the shell 1 from the backwashing inlet pipe 12 from bottom to top, the clean water first enters the raw water inlet pipe 11 and then is discharged from the backwashing drainage pipe 121 which is in communication with the raw water inlet pipe 11; at the same time of backwashing, clean air is introduced into the interior of the shell 1 through the cleaning air inlet 14, air flow is generated in the interior of the shell 1, the upper hole plate 21 moves upward to make the chain 23 contract and float upward, the fiber bundle 2 is elongated to wash the impurities on the upper part, and the clean air is discharged from the exhaust pipe 13 at the top of the shell 1 after cleaning;

[0105] The washing wastewater in the shell 1 is discharged from the vent pipe 122.

[0106] Experimental example

[0107] The methods of examples 1-21 of the present application are combined with the fiber filter in example 22 to conduct field experimental verification, the pollutants in the circulating water include Cd 2+and Ni 2+ Various heavy metal ions, respectively, take the sample of each embodiment into 5 fiber filters to test the performance of the fiber, the average value of the filtration results of 5 fiber filters in each embodiment for various heavy metals is taken as the filtration result of the embodiment, and the specific exploration is as follows:

[0108] 1. The influence of various parameters in the preparation process on the filtration effect of the fiber.

[0109] Table 1 Average removal rate (%) of Cd 2+ and Ni 2+ Various heavy metal ions

[0110]

[0111] From the results in Table 1, the average removal rate of various heavy metal ions in Examples 1-21 all reached more than 95%, and it can be known by comparison that when the proportion of polypropylene is too small or too large, the dissolution parameter is too small or too large, the modification parameter is too small or too large, the addition amount of the pore-forming agent is too small or too large, the pore-forming parameter is too small or too large, the proportion of aluminum oxide in the pore-forming agent is too small or too large, the parameter of electrospinning is too small or too large, the particle size and addition amount of nano-iron particles are too small or too large, the temperature difference of wet spinning is too small or too large, the parameter of fiber forming is too small or too large, and the aspect ratio of the fiber is too small or too large, the average removal rate of the fiber for various heavy metal ions will be reduced, therefore, overall, the parameter effect of Example 1 is relatively optimal.

Claims

1. An internal fiber for improving the efficiency of a circulating water fiber filter, characterized in that, The fibers consist of a first modified layer (211), an adsorption layer (212), and a second modified layer (213) from the outside to the inside. Its preparation method includes the following steps: S1, Preparation of the first modified layer (211): Polypropylene and coupling agent are dissolved in solvent at 150~160℃ to obtain a solution. Then, grass slurry and chitosan solution are added to the solution in sequence and modified at 60~70℃ for 40~50min to obtain a modified spinning solution. The modified spinning solution is divided into three parts with equal mass ratio. The first part of the modified spinning solution is wet spun to obtain the first modified layer (211). The mass ratio of the polypropylene, coupling agent, and solvent is 1~3:0.2:15, and the amounts of the *Euphorbia milii* slurry and chitosan solution added are 20~30 wt.% and 10~15 wt.% of the solution, respectively. S2, Preparation of the adsorption layer (212): Then, at 65~80℃, a pore-forming agent accounting for 3~4% of the mass of the second modified spinning solution is added to the second modified spinning solution obtained in step S1, and stirred for 2.5~4h. Then, the adsorption layer (212) is obtained by electrospinning. S3, Preparation of the second modified layer (213): Nano-iron particles with a particle size of 55~350nm are added to the third modified spinning solution obtained in step S1. The amount of nano-iron particles added is 1~2wt.% of the third modified spinning solution. Then, a second modified layer (213) is obtained by wet spinning. S4. Fiber Preparation: The first modified layer (211), the adsorption layer (212) and the second modified layer (213) are heat-set at 100~150℃, and then the first modified layer (211), the adsorption layer (212) and the second modified layer (213) are reinforced by needle punching to obtain fiber.

2. The method for preparing internal fibers to improve the efficiency of a circulating water fiber filter according to claim 1, characterized in that, The solvent is xylene or trichlorobenzene, and the coupling agent is γ-aminopropyltrimethoxysilane.

3. The internal fiber for improving the efficiency of a circulating water fiber filter according to claim 1, characterized in that, In steps S1 and S3, the spinning solution temperature for wet spinning is 110~120℃, and the coagulation bath temperature is 40~50℃.

4. The internal fiber for improving the efficiency of a circulating water fiber filter according to claim 1, characterized in that, In step S2, the pore-forming agent comprises, by mass parts: 15-18 parts calcium carbonate, 2-3 parts carbon powder, and 6-9 parts aluminum oxide.

5. The internal fiber for improving the efficiency of a circulating water fiber filter according to claim 1, characterized in that, In step S2, the electrospinning voltage is 13~16kV, the spinning solution flow rate is 0.6~0.8mL / h, and the receiving distance from the spinneret to the receiving plate is 16~18cm.

6. The internal fiber for improving the efficiency of a circulating water fiber filter according to claim 1, characterized in that, In step S4, the diameter of the fiber is 0.8~1.5cm and the length is 0.8~50cm.

7. The internal fiber for improving the efficiency of a circulating water fiber filter according to claim 1, characterized in that, In step S4, the needling density of the acupuncture method is 950~1050 times / cm. 2 .

8. A filter with internal fibers that improve the efficiency of a circulating water fiber filter according to any one of claims 1 to 7, characterized in that, The device includes a housing (1), the top of which is provided with a manhole (15) communicating with the interior and a lifting lug (22). Inside the housing (1) are an upper perforated plate (21) slidably and sealingly connected to the inner wall of the housing (1), a lower perforated plate (24) fixedly connected to the inner wall of the housing (1), and a fiber bundle (2) disposed between the upper perforated plate (21) and the lower perforated plate (24). The two ends of the fiber bundle (2) are fixedly connected to the upper perforated plate (21) and the lower perforated plate (24) respectively, and the fiber bundle (2) is made of 500 to 10,000 fibers bundled together. The lifting lug (22) is fixedly connected to the upper perforated plate (21) by a chain (23). The side wall of the housing (1) is provided with a cleaning air inlet (14) communicating with the interior. The top of the housing (1) is provided with a raw water inlet pipe (11) that communicates with its interior and an exhaust pipe (13) for discharging cleaning air. The raw water inlet pipe (11) is provided with a backwash drain pipe (121) that communicates with the interior of the housing (1). The bottom of the housing (1) is provided with a backwash inlet pipe (12) that communicates with its interior. The backwash inlet pipe (12) is provided with a raw water outlet pipe (111) that communicates with the interior of the housing (1) and an empty pipe (122) that communicates with the backwash inlet pipe (12). Switch valves are provided on the cleaning air inlet (14), exhaust pipe (13), raw water inlet pipe (11), raw water outlet pipe (111), backwash inlet pipe (12), backwash drain pipe (121), and drain pipe (122).

9. A filter with internal fibers that improve the efficiency of a circulating water fiber filter according to claim 8, characterized in that, The thickness of the upper perforated plate (21) is 10~12mm.

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