Wool flushing water pretreatment device for viscose fiber production

Abstract

The utility model discloses a wool flushing water pretreatment device for viscose fiber production, which relates to the technical field of viscose fiber production and comprises a shell and a static mixer, a slag discharge port is arranged at the bottom of the shell, a water inlet and a chemical inlet are arranged on one side of the static mixer, and a water outlet is arranged on the other side of the static mixer. A water outlet of the static mixer is connected with a feed port of the shell, a liquid distributor is arranged in the shell, a liquid inlet of the liquid distributor is connected with the feed port of the shell, a baffle plate is arranged at the position of a liquid outlet of the liquid distributor, the upper end of the baffle plate is fixedly connected with the top wall of the shell, and a gap is formed between the lower end of the baffle plate and the bottom wall of the shell; and striker plates are arranged on the side, close to the discharging port, in the shell and comprise the upper striker plate and the lower striker plate, and the upper striker plate and the lower striker plate are arranged in a spaced mode. The device can effectively pretreat wool flushing water, remove large-particle impurities in the wool flushing water, prolong the backwashing period of the tow filter, improve the filtering effect of the tow filter and reduce the water cost.

Description

Technical Field

[0001] This utility model relates to the field of viscose fiber production technology, and in particular to a pretreatment device for rinsing water in viscose fiber production. Background Technology

[0002] In the viscose fiber production process, viscose is transported to the spinning machine through adhesive pipelines. Cellulose xanthate is decomposed upon contact with acid to form cellulose; this process is called fiber forming, commonly known as spinning. During spinning, the newly formed filaments contain a large number of impurities, including impurities from the raw materials in the viscose, large amounts of colloidal sulfur generated from xanthation byproducts, trace amounts of surfactants in the acid bath, fine short fibers produced after the reaction, and oils. After the filament bundle is cut, a washing solution is used to remove the cut fibers, allowing the fibers to enter the next stage. High concentrations of suspended solids and soluble impurities carried in the fibers are washed out with the washing solution. Due to increasingly stringent industry competition and environmental policies, the washing solution needs a high recycling rate in the viscose production process; however, the presence of these substances significantly increases the difficulty of reusing the washing solution. In the industry, the rinsing water is usually filtered through a fiber tow filter and then directly returned to the cutting machine. However, the large amount of impurities contained in the rinsing water during the filtration process puts a heavy burden on the fiber tow filter, making it prone to clogging. This results in poor purification effect and short backwashing cycle. Therefore, a pretreatment device needs to be added before the rinsing water enters the filter to remove some large particulate impurities and improve the filtration efficiency of the fiber tow filter.

[0003] Utility model patent CN221385436U discloses a purification device for rinsing water generated during viscose fiber processing. Addressing the issue that existing viscose fiber cleaning processes wash away surface lint, causing recycled water to be washed back onto the viscose fibers, affecting processing quality and potentially clogging the circulating water pump, the proposed solution includes a housing. The housing has a rinsing chamber and an installation chamber. The rinsing chamber contains a filter screen, filter cotton, and activated carbon. A motor is fixedly installed on one side of the housing.

[0004] However, the patent only addresses the recycling of rinsing water and the problem of clogging of the circulating water pump, without taking any action on the impurities present in the rinsing water.

[0005] Patent application CN116891317A discloses a method for recovering rinsing water from viscose fiber production. The method includes flowing the rinsing water into an acid bath mixing tank at an acid station, mixing it with recycled acid from spinning; filtering out lint and impurities from the rinsing water; and then allowing it to enter an acid bath flash evaporation device to evaporate the water before it enters the bottom tank of the acid bath. This invention's technical solution recovers chemical materials and heat from the rinsing water, achieving resource recycling and reuse while simultaneously protecting the environment and contributing to a green and low-carbon transformation.

[0006] However, this patented device allows the rinsing water to enter the filter directly without any treatment. The rinsing water contains a lot of large particles and impurities, which puts a heavy burden on the filter and makes it very easy to clog the filter. Utility Model Content

[0007] This invention aims to provide a pretreatment device for rinsing water in viscose fiber production. It effectively pretreatments the rinsing water, removing large particulate impurities, extending the backwashing cycle of the fiber tow filter, improving the filtration efficiency of the fiber tow filter, and reducing water costs. Simultaneously, the rinsing water flow rate is matched with the capacity and height of the pretreatment device, ensuring the sedimentation of impurities in the rinsing water. Furthermore, the device has a simple and durable structure and is easy to maintain.

[0008] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0009] A pretreatment device for rinsing water in viscose fiber production includes a shell and a static mixer. The shell has an inlet on the top of one side, an outlet on the other side, and a slag discharge port at the bottom. The static mixer has a water inlet and a chemical inlet on one side, and an outlet on the other side. The outlet of the static mixer is connected to the inlet of the shell. A distributor is installed inside the shell, with its inlet connected to the inlet of the shell. The outlet of the static mixer is connected to the inlet of the distributor through the inlet of the shell. A baffle plate is located at the outlet of the distributor, with its upper end fixedly connected to the top wall of the shell, and a gap between its lower end and the bottom wall of the shell. The mixed liquid flowing out of the distributor outlet flows onto the baffle plate and flows downward through the baffle plate. The baffle plate can adjust the flow rate of the flushing water to prevent the fast-flowing, high-pressure flushing water from directly entering the tank, causing water disturbance and affecting the sedimentation effect. A baffle plate is provided on the side of the shell near the discharge port. The baffle plate includes an upper baffle plate and a lower baffle plate. The upper baffle plate is connected to the top of the shell, and the lower baffle plate is connected to the bottom of the shell. The upper and lower baffle plates are arranged alternately, and the baffle plate, the lower baffle plate and the upper baffle plate form a serpentine flow channel.

[0010] The baffle plate can be a rectangular baffle plate, a spiral baffle plate, or a disc-ring baffle plate. The baffle plate can adjust the flow rate of the flushing water and prevent the fast-flowing, high-pressure flushing water from directly entering the tank, causing water disturbance and affecting the sedimentation effect.

[0011] The shell is provided with a sight glass on its side, through which the operator can observe the sedimentation inside the shell. When the sediment-liquid interface inside the shell is higher than a set value, the slag discharge port at the bottom of the shell is opened to discharge the sediment.

[0012] The bottom of the shell is a bucket-shaped structure, and the slag discharge port is located at the bottom of the bucket-shaped structure.

[0013] The bottom of the housing is provided with a support frame, and the bottom of the support frame is provided with multiple support feet, and the housing is fixed by the support feet.

[0014] The liquid distributor has a flat plate structure with multiple parallel flow channels inside. One end of the flow channel is connected to the inlet of the shell, and the other end of the flow channel is an open outlet. The mixture of flushing water and flocculant flows through the open outlet to the baffle plate and then flows downward through the baffle plate.

[0015] The static mixer is either a tubular mixer or a spiral blade mixer.

[0016] An air vent is provided at the top of the housing.

[0017] The beneficial effects of this utility model are:

[0018] 1. The pretreatment device for rinsing water in viscose fiber production of this utility model is located after the fiber feeding tank and before the fiber bundle filter, and more preferably before the rinsing water tank. It can effectively pretreat the rinsing water, remove large particulate impurities, extend the backwashing cycle of the fiber bundle filter, improve the filtration effect of the fiber bundle filter, and reduce water costs.

[0019] 2. This utility model uses baffles to regulate the flow rate of the flushing water, preventing high-flow, high-pressure flushing water from directly entering the tank and causing water disturbance, thus affecting the sedimentation effect. The multi-layered baffles mainly change the flow direction of the flushing water, forcing it to turn multiple times and increasing the degree of turbulence. Simultaneously, it extends the residence time of the flushing water, reducing dead zones. It also protects the equipment by reducing the direct impact of high-speed fluid on the internal structure. Its principle is mainly: ① Adjusting the flow rate by the baffle spacing or orifice ratio; the flow rate changes with the cross-sectional area (e.g., a smaller spacing results in a higher local flow rate). ② Increasing flow resistance; fluid turning leads to kinetic energy loss, reducing the overall flow rate. ③ Turbulence redistributes the fluid's kinetic energy; local flow rate fluctuations occur, but the overall distribution is more uniform.

[0020] Various types of baffles: ① Spiral baffles: The baffles are arranged in a spiral, guiding the fluid forward in a spiral motion. ② Multi-layer baffles: The baffles have inclined blades on their surfaces, changing the direction of fluid flow. ③ Disc-ring baffles: Composed of alternating discs and rings, forming a disc-ring flow channel, guiding part of the fluid longitudinally and reducing pressure drop.

[0021] 3. By setting up a liquid distributor, this utility model can make the water flow evenly distributed on the baffle plate, reduce the water flow speed and pressure, and further increase the baffle effect.

[0022] 4. In this invention, the flocculant, after being mixed by an external mixer, allows impurities to settle rapidly and in large quantities inside the tank, without affecting the sedimentation effect within the tank. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pretreatment device for rinsing water in viscose fiber production according to the present invention.

[0024] Figure 2 This is a schematic diagram of the deposits inside the shell in Embodiment 1 of this utility model.

[0025] Figure 3 This is a schematic diagram of the spiral baffle in this utility model.

[0026] Figure 4 This is a schematic diagram of the liquid distributor in this utility model.

[0027] Figure 5 This is a schematic diagram of the structure of the annular baffle plate in the middle of this utility model.

[0028] Among them, 1. feed inlet; 2. medicine inlet; 3. static mixer; 4. air outlet; 5. sight glass; 6. discharge outlet; 7. slag discharge outlet; 8. support frame; 9. liquid distributor; 10. baffle plate; 11. upper baffle plate; 12. lower baffle plate. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0030] Example 1

[0031] This embodiment provides a method such as Figure 1 The viscose fiber production pretreatment device shown includes a shell and a static mixer 3. A feed inlet 1 is located at the top of one side of the shell, a discharge outlet 6 is located on the other side of the shell, and a slag discharge outlet 7 is located at the bottom of the shell. The static mixer 3 has a water inlet and a chemical inlet 2 on one side, and a water outlet on the other side. The water outlet of the static mixer 3 is connected to the feed inlet 1 of the shell. A distributor 9 is installed inside the shell, with its inlet connected to the feed inlet 1 of the shell. The water outlet of the static mixer 3 and the inlet of the distributor 9 are connected through the feed inlet 1 of the shell. A baffle plate 10 is provided at the outlet of the device 9. The upper end of the baffle plate 10 is fixedly connected to the top wall of the shell, and a gap is provided between the lower end of the baffle plate 10 and the bottom wall of the shell. A baffle plate is provided inside the shell near the outlet 6. The baffle plate includes an upper baffle plate 11 and a lower baffle plate 12. The upper baffle plate 11 is connected to the top of the shell, and the lower baffle plate 12 is connected to the bottom of the shell. The upper baffle plate 11 and the lower baffle plate 12 are spaced apart, and the baffle plate 10, the lower baffle plate 11 and the upper baffle plate 12 form a serpentine flow channel. The static mixer 3 is a tubular mixer.

[0032] In this embodiment, the shell is a cylindrical sedimentation tank (made of fiberglass) with a diameter of 2.0m and a height of 4.5m. The interior is equipped with five layers of rectangular baffles 10, each formed by connecting five rectangular plates end-to-end to create a wave-like baffle. The flocculant used is acid-resistant polyaluminum chloride (PAC), added at a ratio of 50g per ton of flushing water. The static mixer 3 is a DN50 pipeline mixer. The flushing water (pH=2.5, temperature 55℃) enters from the inlet 1 at a flow rate of 15m³ / h, and mixes with the PAC agent within 2 seconds in the static mixer 3 to form a mixed liquid. The mixed liquid is then evenly distributed onto the baffles 10 via a distributor 9, which controls the inflow rate of the mixed liquid. To avoid excessive flow velocity of the mixed liquid causing disturbance within the shell, the mixed liquid flows downwards at a velocity of 0.5 m / s on the baffle plate. After flowing below the liquid surface on the baffle plate 10, the mixed liquid begins to settle. The liquid flows out through the gap between the baffle plate 10 and the bottom of the shell into the serpentine flow channel, where it stays for a sufficient time. After settling, it is finally discharged from the outlet. The flocculated sediment accumulates inside the shell. The turbidity of the liquid discharged from the outlet 6 is reduced from 800 NTU to 15 NTU compared to untreated flushing water. Approximately 50 kg of flocculated sludge with a moisture content of 60% is discharged through the sludge discharge port 7 every 8 hours. Compared to the system without pretreatment, the sedimentation efficiency is increased by 3 times, and the flocculant dosage is reduced by 20%, making it suitable for small-flow production scenarios.

[0033] In this embodiment, by setting baffles, the baffle plate 10, the lower baffle plate 12, and the upper baffle plate 11 form a serpentine flow channel, preventing the flushing water from flowing directly from the inlet 1 to the outlet 6. This allows the flushing water to flow along the serpentine flow channel within the casing, remaining there for a sufficient time to allow sedimentation. Figure 2 The image shows the deposits inside the shell in this embodiment, where a large amount of mud-like impurities are visible. The impurities formed inside the shell are fine particles. The gap between the baffle plate 10 and the bottom of the shell is 10-80cm, so it will not cause blockage at the gap.

[0034] Example 2

[0035] The difference between this embodiment and Embodiment 1 is that, as Figure 3 As shown, in this embodiment, the baffle 10 is a spiral baffle 10, and the rest of the structure is the same as in embodiment 1.

[0036] In this embodiment, the shell is a cylindrical sedimentation tank (made of 316L stainless steel) with a diameter of 4.0m and a height of 8.0m. The interior is equipped with 6 layers of spiral baffles 10, with the diameters of the spirals from top to bottom being 3.5m, 3.0m, 2.5m, 2.0m and 1.5m respectively, and the pitch of each spiral is 1m. Cationic polyacrylamide (CPAM) and acid-resistant polyaluminum chloride (PAC) are selected as composite flocculants, with an addition amount of 3ppm. The static mixer 3 is a DN150 spiral blade mixer. The flushing water (pH=2.5, temperature 55℃) enters from the inlet 1 at a flow rate of 30m³ / h and completes contact mixing with the PAC agent in the static mixer 3. After the mixture enters the shell, it flows down layer by layer between the baffles 10 at a flow rate of 0.8m / s. The turbidity of the liquid discharged from the outlet 6 is reduced from 1000NTU to 60NTU compared to the untreated flushing water. Every 152 hours, about 80kg of flocculated sludge with a moisture content of 60% is discharged through the sludge discharge port 7.

[0037] Example 3

[0038] The difference between this embodiment and embodiment 2 is that, in this embodiment, as... Figure 4 As shown, the liquid distributor 9 has a flat plate structure with multiple parallel flow channels inside. One end of each flow channel is connected to the inlet 1 of the shell, and the other end is an open outlet. The static mixer 3 is a spiral blade mixer. The baffle plate 10 is a disc-ring type baffle plate 10; the rest of the structure is the same as in Embodiment 2.

[0039] In this embodiment, the shell is a cylindrical sedimentation tank (made of fiberglass) with a diameter of 4.0m and a height of 8.0m. The interior is designed for flushing water with a temperature of 70℃ and a turbidity of 2000 NTU. It employs a double-layered insulated tank (lined with a PTFE anti-corrosion layer) and is equipped with... Figure 5 The diagram shows an 8-layer disc-annular baffle 10. The disc-annular baffles are arranged longitudinally inside the shell, which is also longitudinally positioned inside the settling tank. The interior consists of alternating disc-shaped and annular baffles. The disc-shaped baffles cover the shell-side cross-section, forcing the fluid to flow around them, while the annular baffles retain central or peripheral annular channels, allowing the fluid to pass axially. This alternating arrangement creates a periodically changing flow path, optimizing pressure drop and structural stability, while also producing better mixing.

[0040] In this embodiment, high-temperature modified polyferric sulfate (PFS) is used as the flocculant, with an addition ratio of 1.2 kg / ton of water, combined with 0.5 ppm of anionic PAM coagulant aid. The static mixer 3 is a DN150 spiral blade type, and the distributor 9 is a porous plate structure (pore diameter 10 mm, pore density 50 pores / m²). The flushing water (pH=2.5, temperature 55℃) enters from the inlet 1 at a flow rate of 30 m³ / h, and completes a 2-5 second contact reaction with the PAC agent in the static mixer 3; after being evenly distributed by the distributor 9, the mixture flows down layer by layer between the baffles 10 at a flow rate of 0.7 m / s; the residence time in the sedimentation zone is 60 minutes, and the turbidity of the liquid discharged from the outlet 6 is reduced from 2000 NTU to 120 NTU compared to the untreated flushing water.

[0041] Example 4

[0042] The difference between this embodiment and Embodiment 1 is that, in this embodiment, a sight glass opening 5 is provided on the side of the shell; the bottom of the shell has a bucket-shaped structure, and the slag discharge port 7 is located at the bottom of the bucket-shaped structure. A support frame 8 is provided at the bottom of the shell, and multiple support feet are provided at the bottom of the support frame 8; an air outlet 4 is provided at the top of the shell. The rest of the structure is the same as in Embodiment 1.

[0043] In this embodiment, the main function of the sight glass is to observe the amount of impurities settled at the bottom of the tank, facilitating timely cleaning. Simultaneously, the sight glass can also be used to observe the flocculation effect and the aggregation of impurities. The hopper-shaped structure primarily concentrates impurities at the bottom of the tank, allowing for direct discharge from the slag outlet 7. The support feet mainly stabilize the tank and reduce vibration, promoting better sedimentation. The vent 4 primarily removes some internal gas, preventing gas accumulation and safety issues, while also facilitating material discharge and slag removal.

[0044] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A pretreatment device for rinsing water in viscose fiber production, characterized in that: The system includes a shell and a static mixer (3). A feed inlet (1) is located at the top of one side of the shell, a discharge outlet (6) is located on the other side of the shell, and a slag discharge outlet (7) is located at the bottom of the shell. The static mixer (3) has a water inlet and a chemical inlet (2) on one side, and a water outlet on the other side. The water outlet of the static mixer (3) is connected to the feed inlet (1) of the shell. A liquid distributor (9) is installed inside the shell. The inlet of the liquid distributor (9) is connected to the feed inlet (1) of the shell. The water outlet of the static mixer (3) is connected to the inlet of the liquid distributor (9) through the feed inlet (1) of the shell. A baffle plate (10) is provided at the outlet of 9). The upper end of the baffle plate (10) is fixedly connected to the top wall of the shell, and the lower end of the baffle plate (10) is provided with a gap between it and the bottom wall of the shell. A baffle plate is provided on the side of the shell near the outlet (6). The baffle plate includes an upper baffle plate (11) and a lower baffle plate (12). The upper baffle plate (11) is connected to the top of the shell, and the lower baffle plate (12) is connected to the bottom of the shell. The upper baffle plate (11) and the lower baffle plate (12) are spaced apart. The baffle plate (10), the lower baffle plate (11) and the upper baffle plate (12) form a serpentine flow channel.

2. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: The baffle (10) can be a rectangular baffle (10), a spiral baffle (10), or a disc-ring baffle (10).

3. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: The side of the housing is provided with a viewing window (5).

4. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: The bottom of the shell is a bucket-shaped structure, and the slag discharge port (7) is located at the bottom of the bucket-shaped structure.

5. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: The bottom of the housing is provided with a support frame (8), and the bottom of the support frame (8) is provided with multiple support feet.

6. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: The liquid distributor (9) is a flat plate structure. The interior of the flat plate structure is provided with multiple parallel flow channels. One end of the flow channel is connected to the inlet (1) of the shell, and the other end of the flow channel is an open outlet.

7. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: The static mixer (3) is a tubular mixer or a spiral blade mixer.

8. The pretreatment device for rinsing water in viscose fiber production according to claim 1, characterized in that: An air outlet (4) is provided at the top of the housing.

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