A continuous online processing device for lyocell waste glue

Abstract

The utility model discloses a kind of lyocell waste rubber continuous online processing device, including being sequentially arranged and communicating in waste rubber processing flow broken part, leaching part and first liquid storage part;Broken part includes cooperatively arranged shredding device and pulverizing device, shredding device outlet is communicated with pulverizing device import and is used to obtain the waste rubber particle of set size, leaching part includes first soaking pool and first centrifuge, first soaking pool is communicated with first centrifuge by lifting pump, and liquid phase outlet of first centrifuge is communicated with first liquid storage part import.The utility model not only solves the problem that waste rubber processing efficiency is not high in prior art and cannot be applied to continuous, large batch processing, but also reduces water consumption and processing cost in waste rubber processing process, so that continuous online processing becomes possible, with the characteristics of simple structure, low cost, convenient and practical.

Description

Technical Field

[0001] This utility model provides a continuous online treatment device for lyocell waste adhesive, specifically relating to a solvent recovery device in the lyocell fiber production process, belonging to the field of bio-based fiber technology. Background Technology

[0002] NMMO (N-Methylmorpholine N-oxide) is one of the few solvents that can directly dissolve natural cellulose. It is more environmentally friendly than the traditional viscose process (no CS2 pollution) and is the main solvent used in the production of Lyocell fiber (environmentally friendly man-made fiber). However, its unit cost is relatively high. Therefore, the effective recovery of NMMO solvent in the Lyocell fiber production process has become one of the important means to reduce the production cost of Lyocell.

[0003] In the production of Lyocell fibers, waste glue mainly refers to the waste generated during cellulose dissolution, spinning, and post-processing, containing N-methylmorpholine-N-oxide (NMMO) solvent, cellulose residues, impurities, and byproducts. It appears as irregularly shaped lumps, viscous gels, or dried hard lumps, or as loose short fiber bundles, tangled filaments, or continuous filament waste, or as particles or powders of varying sizes, or as flakes or film-like residues. If not properly treated, it will pollute the environment and waste valuable resources. Waste pulp mainly comes from the residues generated during the swelling of cellulose pulp. Its main components include swollen cellulose, hemicellulose, N-methylmorpholine-N-oxide (NMMO) solvent, additives (such as stabilizers and antioxidants), and other impurities.

[0004] In the production of Lyocell fibers, waste glue and pulp are inevitably generated. The treatment of these waste glues and pulps directly impacts production costs, environmental impact, and product quality. Improper treatment can lead to resource waste or environmental pollution. Therefore, the main purpose of waste glue and pulp treatment is to maximize the recovery of NMMO solvents, reduce environmental pollution, and achieve the resource utilization of waste glue and pulp, thereby realizing the sustainable development of Lyocell fiber production.

[0005] In existing technologies, the main process for treating waste adhesives includes crushing, multiple soaking, and solid-liquid separation to obtain a liquid and solid residue containing NMMO solvent. The soaking stage utilizes the concentration difference to diffuse HMMO from the surface and interior of the waste adhesive particles into the washing water. The lower the concentration of HMMO in the washing water after multiple washes and filtrations, the higher the HMMO recovery rate. Therefore, existing waste adhesive treatment equipment or devices mostly use crushing, soaking, and dehydration to achieve effective solvent recovery from waste adhesives. However, if existing waste adhesive treatment devices are to be used for large-scale industrial production, the following problems still exist: (1) Low waste glue treatment efficiency, unable to carry out continuous and large-scale processing: In the production process of Lyocell fiber, the waste glue generated by each section has different shapes and sizes. If it is not sorted and processed, the waste glue treatment efficiency will be low, and continuous and large-scale processing will not be carried out. For example, in the existing technology, only a crusher is used for crushing. Larger particles of waste glue, sheet-like waste glue, or thicker waste glue are not easy to crush in the crusher. Even if they are crushed, it will take a long time, resulting in low crushing efficiency. If crushing efficiency is pursued and the crushing time is shortened, the size of the waste glue particles obtained will be inconsistent, which will affect the subsequent impregnation and dehydration efficiency. Moreover, the waste glue obtained after treatment has a large water content, which increases the subsequent resource recycling process.

[0006] (2) Excessive water consumption and high energy consumption during waste glue treatment: On the one hand, the waste glue is not finely crushed (i.e. the particle size is large), which increases the soaking and washing time and reduces the efficiency of solvent recovery; on the other hand, the centrifuge dehydration rate is insufficient, resulting in a high proportion of water carried by the waste glue particles, which leads to increased water consumption and also increases the number of washing times, reducing the efficiency of solvent recovery.

[0007] (3) The clear liquid obtained after waste glue treatment cannot be directly entered into the solvent purification and recovery process: The clear liquid contains a large number of tiny particles and fine fibers, which will clog the plate and frame filter press, quartz sand filter and ion exchange bed resin in the subsequent solvent purification and recovery process, resulting in insufficient overall throughput, reducing the efficiency of the purification and recovery process, and causing cleaning difficulties. In severe cases, it will also cause the ion exchange of the ion exchange bed resin to fail, affecting the process of solvent purification, recovery and reuse.

[0008] In existing technologies, the treatment of waste slurry mainly involves separating the solid residue from the liquid portion through filtration or centrifugation to obtain a liquid and solid residue containing NMMO solvent. However, this method still has the following problems: (1) Low recovery rate of HMMO solvent: There are large solid residues in the waste slurry, and the HMMO solvent in it cannot be directly separated and recovered by filtration or centrifugation.

[0009] (2) Low efficiency of waste pulp treatment: The fibers in the waste pulp are entangled together, making it difficult to crush and centrifuge, resulting in low centrifugation efficiency and hindering solvent recovery.

[0010] (3) Although waste glue and waste slurry contain renewable resources such as HMMO solvent and cellulose that need to be recycled and will not cause cross-contamination, there is no equipment or device in the existing technology that can simultaneously process waste glue and waste slurry.

[0011] In the prior art, for example, the invention patent application with authorization publication number CN114921874A discloses a method for recovering NMMO solvent from waste glue in the production process of lyocell fiber, which uses secondary impregnation and dehydration to improve the recovery rate of HMMO in waste glue; another example is the utility model patent with authorization publication number CN207286918U, which discloses a solvent recovery device for lyocell fiber, which connects the outlet of the waste glue soaking tank to a plate and frame filter press and a centrifuge respectively through a discharge pump, thereby realizing the separate treatment of different waste glues, thus solving the problem of low efficiency in large-scale waste glue processing, and reducing the amount of washing water by setting a return pipeline connected to the waste glue soaking tank on the plate and frame filter press. None of the above patents solve the problem of low efficiency in crushing large quantities of waste glue of different shapes and sizes; therefore, the prior art does not provide a technical solution to solve the above or related problems. Utility Model Content

[0012] The purpose of this invention is to utilize the coordinated operation of a shredding device and a crushing device to process waste adhesive of different shapes and sizes, thereby improving the efficiency of waste adhesive treatment and solving the problem of low efficiency and inability to perform continuous, large-scale processing of waste adhesive in the prior art.

[0013] This utility model is achieved through the following technical solution: A continuous online treatment device for lyocell waste adhesive includes a crushing section, an leaching section, and a first storage section arranged sequentially and connected along the waste adhesive treatment process. The crushing section includes a shredding device and a crushing device arranged in cooperation. The outlet of the shredding device is connected to the inlet of the crushing device and is used to obtain waste adhesive particles of a set size. The leaching section includes a first soaking tank and a first centrifuge. The first soaking tank is connected to the first centrifuge through a booster pump. The liquid phase outlet of the first centrifuge is connected to the inlet of the first storage section.

[0014] Preferably, a feeding section is also provided, which includes a feeding device and a screening device. The feeding device is located above the screening device and is connected to the inlet of the screening device through a feeding port located below it. The screening device is provided with at least a screen with an aperture of 5~10mm. The screening device is provided with two outlets with different discharge particle sizes. The outlet with the larger discharge particle size is connected to the inlet of the shredding device, and the outlet with the smaller discharge particle size is connected to the inlet of the crushing device.

[0015] Preferably, the feeding port is provided with a movable partition to restrict the feeding.

[0016] Preferably, the feeding section is further provided with a feed inlet for waste porridge, and the crushing section is provided with a porridge crusher. The inlet of the porridge crusher is connected to the feed inlet, and the outlet of the porridge crusher is connected to the first soaking tank.

[0017] Preferably, the crushing device is equipped with a sorting mechanism with a screen aperture of 2-5mm to convey waste glue particles of a set size to the first soaking tank.

[0018] Preferably, the leaching section is further provided with a second soaking tank and a second centrifuge. The inlet of the second soaking tank is connected to the solid phase outlet of the first centrifuge. The second soaking tank is connected to the inlet of the second centrifuge through a second booster pump. The liquid phase outlet of the second centrifuge is connected to the first soaking tank.

[0019] Preferably, the temperature in both the first soaking tank and the second soaking tank is 40~60℃.

[0020] Preferably, the outlet of the first liquid storage section is further provided with a first filtration section, a second liquid storage section, a second filtration section and a third liquid storage section connected in sequence. The first filtration section includes at least one plate and frame filter press. The inlet of the plate and frame filter press is connected to the first liquid storage section through a plunger pump. The outlet of the plate and frame filter press is connected to the second liquid storage section. A centrifugal pump is provided between the second filtration section and the third liquid storage section.

[0021] Preferably, the first soaking tank, the first liquid storage section, the second liquid storage section and the third liquid storage section are all provided with sampling ports for testing.

[0022] Preferably, both the crushing device and the first soaking tank are provided with water inlets that are connected to the outlet of the condensate pipe.

[0023] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model provides a complete set of various equipment required for waste glue treatment by sequentially setting and connecting the crushing section, leaching section and first liquid storage section along the waste glue treatment process, so as to ensure the integrity of the waste glue treatment process.

[0024] (2) By setting up a shredding device and a crushing device that work together in the crushing section and connecting the outlet of the shredding device with the inlet of the crushing device, this utility model can not only achieve the purpose of classifying and feeding waste rubber according to its shape and size into the shredding device and the crushing device, but also effectively improve the efficiency of obtaining waste rubber particles of a set size.

[0025] (3) By setting a first soaking tank and a first centrifuge in the leaching section, this utility model achieves the purpose of soaking and recovering NMMO solvent from waste glue particles of a set size.

[0026] (4) The present invention can store the recovered NMMO solvent through the setting of the first liquid storage section for subsequent purification and use.

[0027] (5) This utility model achieves the goal of classified feeding by setting up a feeding section including a feeding device and a screening device. The screen diameter inside the screening device is set to 5~10mm, and the outlet with the larger particle size of the two outlets of the screening device is connected to the inlet of the shredding device, and the outlet with the smaller particle size is connected to the inlet of the crushing device. This can prevent larger particles of waste rubber from directly entering the crushing device, thereby improving the crushing efficiency. Preferably, a movable baffle is set on the feeding item to restrict the feeding and use, so as to avoid the phenomenon that the waste rubber to be crushed accumulates too much and blocks the feed inlet of the shredding device or the crushing device, thus affecting the crushing efficiency.

[0028] (6) This utility model sets up a feed inlet for waste slurry in the feeding section and a slurry crusher in the crushing section. The inlet of the slurry crusher is connected to the feed inlet, and the outlet of the slurry crusher is connected to the first soaking tank, so that waste slurry can be processed simultaneously with waste glue, thereby improving the processing efficiency of waste slurry.

[0029] (7) This utility model sets a sorting mechanism with a screen aperture of 2~5mm in the crushing device, thereby preventing waste glue particles larger than 2~5mm from entering the first soaking tank, thereby effectively improving the recovery rate of NMMO solvent.

[0030] (8) By setting up a second soaking tank and a second centrifuge in the leaching section, this utility model can, on the one hand, further recover the residual NMMO solvent in the waste glue after the first soaking, and on the other hand, by connecting the liquid phase outlet of the second centrifuge to the first soaking tank, realize the purpose of reusing the washing water with low NMMO solvent concentration in the second soaking tank, thereby reducing water consumption in the waste glue treatment process and thus reducing the cost of waste glue treatment.

[0031] (9) This utility model improves the recovery rate of NMMO solvent by keeping the temperature of the first soaking tank and the second soaking tank at 40~60℃, and does not cause environmental pollution problems caused by the decomposition of NMMO solvent.

[0032] (10) This utility model achieves graded filtration of the recovered liquid by setting a first filtration section, a second filtration section, a third filtration section and a third filtration section in sequence at the outlet of the first filtration section, which can effectively prevent fine particles and fine cellulose in the recovered liquid from affecting the subsequent purification process; by setting at least one plate and frame filter press in the first filtration section, and connecting the inlet of the plate and frame filter press to the first filtration section through a plunger pump, and connecting the outlet of the plate and frame filter press to the second filtration section, a primary filtration is achieved; the recovered liquid is filtered a second time through the second filtration section, and the recovered water is transported to the third filtration section for temporary storage through a centrifugal pump between the second filtration section and the third filtration section, and the liquid phase outlet of the centrifugal pump is connected to the third filtration section; the above two graded filtrations ensure that the recovered liquid entering the subsequent purification process can meet the set requirements.

[0033] (11) This utility model sets up a sampling port for testing in the first soaking tank, and sets up sampling ports for testing in the first liquid storage section, the second liquid storage section and the third liquid storage section, thereby realizing the monitoring of various test indicators of the liquid in each processing stage, and thus effectively controlling the indicators of the recovered liquid that finally enters the subsequent purification process to meet the set requirements.

[0034] (12) This utility model reduces water consumption and cost of waste glue treatment by setting an inlet connected to the outlet of the condensate pipe in the crushing device and the first soaking tank.

[0035] In summary, this utility model features a simple structure, low cost, and ease of use. It not only solves the problem of low waste glue treatment efficiency in the prior art, which prevents it from being applied to continuous and large-scale processing, but also reduces water consumption and treatment costs in the waste glue treatment process, making continuous online processing possible. This is conducive to the sustainable development of the lyocell industry and has high practical value. Attached Figure Description

[0036] Figure 1 This is a flowchart illustrating the present invention. Wherein, 1—feeding section, 101—feeding device, 102—screening device, 103—feed inlet, 2—crushing section, 201—shredding device, 202—pulverizing device, 3—leaching section, 301—first soaking tank, 302—first centrifuge, 303—second soaking tank, 304—second centrifuge, 4—first liquid storage section, 5—first filtration section, 6—second liquid storage section, 7—second filtration section, 8—third liquid storage section. Detailed Implementation

[0037] 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.

[0038] Example 1: like Figure 1 As shown in the structure, this embodiment discloses a continuous online treatment device for lyocell waste adhesive, including a crushing section 2, an leaching section 3, and a first storage section 4 arranged and connected sequentially along the waste adhesive treatment process; the crushing section 2 includes a shredding device 201 and a crushing device 202 arranged in cooperation, the outlet of the shredding device 201 is connected to the inlet of the crushing device 202 and is used to obtain waste adhesive particles of a set size; the leaching section 3 includes a first soaking tank 301 and a first centrifuge 302, the first soaking tank 301 is connected to the first centrifuge 302 through a booster pump, and the liquid phase outlet of the first centrifuge 302 is connected to the inlet of the first storage section 4.

[0039] It should be noted that in this embodiment, the crushing section 2 conveys waste rubber particles to the leaching section 3. Therefore, a conveyor belt is used to connect the crushing section 2 and the leaching section 3. The shredding device 201 is a shredder, and the crushing device 202 is a crusher. If the outlet end of the crusher is directly set above the first soaking tank 301, the crushed waste rubber particles can fall directly into the first soaking tank 301 from its outlet, thus eliminating the need for a conveyor belt. Therefore, any structure or device that allows the crushing section 2 and the leaching section 3 to connect is suitable for this embodiment. The working principle of this embodiment is as follows: First, the collected waste adhesive is sorted and put into the shredding device 201 and crushing device 202 of the crushing section 2 for graded crushing and all of it is converted into waste adhesive particles of 2~5mm. Then, it is soaked in the leaching section 3 to recover the NMMO solvent in the waste adhesive.

[0040] The usage method of this embodiment, and the specific operation steps are as follows: Step 1: Turn on the shredding device 201 and the crushing device 202, and sort and dispose of the collected waste adhesive: (1) Waste rubber of 10~500mm or larger is put into the shredding device 201 and shredded into waste rubber particles of 5~10mm. Then it enters the crushing device 202 connected to the shredding device 201 and crushes it into waste rubber particles of 2~5mm. (2) Waste glue smaller than 10mm is put into the crushing device 202 and crushed into waste glue particles of 2~5mm; Step 2: When all the waste glue has been crushed, turn off the shredding device 201 and the crushing device 202, put all the obtained 2-5mm waste glue particles into the first soaking tank 301, and add enough washing water (or desalinated water) at the same time, and soak according to the set requirements. Step 3: After soaking, the waste adhesive particles and washing water in the soaking tank are transported to the first centrifuge 302 by a booster pump for centrifugation. The NMMO concentration of the liquid phase output is 5~10%, which is then transported to the first storage unit 4 for subsequent purification processes. At the same time, the waste adhesive particles with a water content of 10%~30% are output from the solid phase outlet for later use.

[0041] In this embodiment, the sorting and disposal of waste adhesive is done manually, which may lead to inaccurate sorting and affect subsequent processing efficiency. Therefore, to ensure more accurate feeding, a feeding unit 1 is provided, which includes a feeding device 101 and a screening device 102. Feeding device 101: Located above the screening device 102, and connected to the inlet of the screening device 102 through the feeding port located below it; Screening device 102: Located below the feeding port of feeding device 101, the feeding port is connected to the inlet of screening device 102. Screening device 102 is equipped with at least a screen with an aperture of 5~10mm. The outlet of screening device 102 with a larger particle size is connected to the inlet of shredding device 201, and the outlet with a smaller particle size is connected to the inlet of crushing device 202.

[0042] Therefore, with the addition of the feeding unit 1, the manual sorting and input in step 1 of the usage method in this embodiment is completed collaboratively by the feeding device 101 and the screening device 102 in the feeding unit 1, that is, the waste material is simply fed into the feeding device 101. The screening device 102 used in this embodiment is a primary screening device and is set up according to conventional methods, which belongs to the prior art, and therefore will not be described in detail here.

[0043] Furthermore, considering the need to save manpower and resources and improve solvent recovery rate, the following optimizations were made to this embodiment.

[0044] 1. To prevent excessive waste glue from clogging the inlets of the shredding device 201 and the crushing device 202, a movable baffle is installed at the feeding port to limit the use of waste glue. At the same time, it can also improve the crushing efficiency.

[0045] 2. To reduce the cost of waste glue treatment and achieve resource reuse, both the crushing device 202 and the first soaking tank 301 are equipped with inlets connected to the outlet of the condensate pipe or the outlet of the condensate storage device. During the Lyocell waste glue treatment process, there may be multiple locations requiring water. As long as it does not cause secondary pollution or increase environmental pressure, condensate can be used to reduce water waste and achieve water recycling. For example, it can be used as rinsing water for the filter cake in a plate and frame filter press.

[0046] 3. To ensure the recovery rate of NMMO, the following methods were adopted: (1) Ensure that the waste glue entering the first soaking tank 301 is all waste glue particles of 2~5mm. A sorting mechanism with a screen aperture of 2~5mm is set in the crushing device 202 to prevent excessively large waste glue particles from entering the first soaking tank 301.

[0047] (2) The leaching section 3 is also provided with a second soaking tank 303 and a second centrifuge 304, and the inlet of the second soaking tank 303 is connected to the solid phase outlet of the first centrifuge 302. The second soaking tank 303 is connected to the inlet of the second centrifuge 304 through a second booster pump. The second soaking tank 303 can not only further clean out the NMMO solvent remaining in the waste glue after the first soaking, but also connect to the first soaking tank 301 through the liquid phase outlet of the second centrifuge 304, so that the cleaning water with low NMMO concentration can be returned to the first soaking tank 301 for secondary use, thereby reducing the amount of cleaning water used and thus reducing the cost of waste glue treatment.

[0048] In this method, a second soaking tank 303 and a second centrifuge 304 are set up to achieve staged leaching of the solvent, which not only further improves the recovery rate of NMMO solvent, but also enables the reuse of low-concentration recovery liquid, thereby reducing the amount of cleaning water used.

[0049] (3) Set the temperature in the first soaking tank 301 and the second soaking tank 303 to 40~60℃.

[0050] (4) Ensure the soaking time of waste rubber particles: the first soaking time is 1 to 2 hours, and the second soaking time is 2 to 4 hours.

[0051] The optimized usage method of this embodiment requires the addition of the following steps: Step 4: The waste rubber particles after centrifugation by the first centrifuge 302 are transported to the second soaking tank 303, and sufficient cleaning water is added again. Soak for 2-4 hours according to the set requirements.

[0052] Step 5: After the second soaking is completed, the waste glue and cleaning water in the second soaking tank 303 are transported to the second centrifuge 304 by the lift pump for centrifugation. The waste glue particles with an NMMO concentration of 5~10% are packaged and recycled. The cleaning water with an NMMO concentration of 0.5~2% is sent to the first soaking tank 301 for secondary use through the water supply pipe.

[0053] After optimization, this embodiment not only improves the efficiency of waste adhesive treatment through graded crushing, but also improves the recovery of NMMO solvent through graded leaching. In addition, the return of low-concentration cleaning water to the first soaking tank 301 for secondary use also reduces the amount of cleaning water used, thereby achieving the effects of energy saving, emission reduction and efficiency improvement.

[0054] Example 2: This embodiment is an optimization based on Embodiment 1. The feeding section 1 is further equipped with an inlet 103 for waste slurry, and the crushing section 2 is equipped with a slurry pulverizer 203. The inlet of the slurry pulverizer 203 is connected to the inlet 103, and the outlet of the slurry pulverizer 203 is connected to the first soaking tank 301. This embodiment mainly involves simultaneously processing waste slurry during waste glue treatment, which not only effectively improves the efficiency of waste slurry treatment but also reduces the need for recycling equipment (such as centrifuges and filters), effectively improving resource utilization.

[0055] In this embodiment, the feed inlet 103 and the porridge pulverizer 203 can be connected by a feed pipe or by a booster pump. The purpose is to transport the collected waste porridge to the porridge pulverizer 203 for further pulverization. Therefore, any structure or device that can achieve the above purpose is applicable to this embodiment.

[0056] The working principle of this embodiment is as follows: before the waste slurry enters the first soaking tank 301, the larger particles in the waste slurry are crushed according to the set requirements by the slurry crusher 203 before being fed into the first soaking tank 301. During this process, washing water can be added to dilute the waste slurry to prevent it from sticking to the slurry crusher 203.

[0057] The usage method of this embodiment, and the specific operation steps are as follows: Step 1: Turn on the shredding device 201, the crushing device 202, and the porridge crusher 203, and sort and dispose of the collected waste glue and waste porridge: (1) Waste rubber of 10~500 mm or more is put into the shredding device 201 and shredded into waste rubber particles of 5~10 mm. Then it enters the crushing device 202 connected to the shredding device 201 and crushes it into waste rubber particles of 2~5 mm. (2) Waste glue smaller than 10 mm is put into the crushing device 202 and crushed into waste glue particles of 2~5 mm; (3) Waste porridge enters the porridge crusher 203 through the feed inlet 103, where larger particles are crushed to 2~5mm; Step 2: Turn off the shredding device 201, crushing device 202 and porridge crusher 203. Put all the waste glue and waste porridge that have been crushed according to the set requirements into the first soaking tank 301, and add enough washing water (or desalinated water) at the same time. Soak for 1 to 2 hours according to the set requirements. Step 3: The soaking tank and waste glue particles and washing water after soaking are transported to the first centrifuge 302 by the booster pump for centrifugation. The NMMO concentration of the recovered liquid output from the liquid phase outlet is 5~10% and is transported to the first storage section 4 for subsequent purification process. The solid phase outlet outputs waste glue particles with a water content of 10%~30%. Step 4: The waste glue particles with a moisture content of 10% to 30% (after centrifugation in the first centrifuge 302) are transferred to the second soaking tank 303, and sufficient washing water is added again. Soak for 2 to 4 hours according to the set requirements. Step 5: After the second soaking is completed, the waste glue and cleaning water in the second soaking tank 303 are transported to the second centrifuge 304 by the lift pump for centrifugation. The waste glue particles with an NMMO concentration of 5~10% are packaged and recycled. The cleaning water with an NMMO concentration of 0.5~2% is sent to the first soaking tank 301 for secondary use through the water supply pipe.

[0058] Example 3: This embodiment is an optimization based on Embodiment 1 or Embodiment 2. The outlet of the first liquid storage section 4 is further provided with a first filtration section 5, a second liquid storage section 6, a second filtration section 7, and a third liquid storage section 8 connected in sequence. The first filtration section 5 includes at least one plate and frame filter press. The inlet of the plate and frame filter press is connected to the first liquid storage section 4 via a plunger pump, and the outlet of the plate and frame filter press is connected to the second liquid storage section 6. A centrifugal pump is installed between the second filtration section 7 and the third liquid storage section 8. Thus, through multiple flocculation sedimentation and graded filtration, the adverse effects on subsequent purification processes are reduced or eliminated as much as possible.

[0059] The main purpose of this embodiment is to ensure that the subsequent purification process of the recovered NMMO solvent can proceed smoothly. Therefore, it is necessary to prevent fine particles and fine cellulose in the recovered liquid from affecting the subsequent purification process.

[0060] In this embodiment, both the first filtration section 5 and the second filtration section 7 are equipped with plate and frame filter presses as filtration devices. A #1 plate and frame filter press is installed in the first filtration section 5, and a #1 plunger pump, used in conjunction with the #1 plate and frame filter press, is installed between the first filtration section 5 and the first liquid storage section 4. A #2 plate and frame filter press is installed in the second filtration section 7, and a #2 plunger pump, used in conjunction with the #2 plate and frame filter press, is installed between the second filtration section 7 and the second liquid storage section 6, thereby achieving secondary filtration of the recycled water. In this embodiment, both the #1 and #2 plate and frame filter presses are equipped with filter cloths with a filtration accuracy of 100μm.

[0061] Furthermore, to ensure that the recovered liquid entering the subsequent purification stage meets all the requirements and to ensure the smooth progress of NMMO solvent recovery, sampling ports for testing are provided in the first soaking tank 301, the first liquid storage section 4, the second liquid storage section 6, and the third liquid storage section 8. This enables effective monitoring of various indicators of the recovered liquid, allowing for timely adjustments to the treatment plan to ensure that the recovered liquid meets the requirements of the purification process.

[0062] The working principle of this embodiment: (1) The recovered liquid (i.e. the liquid output from the liquid phase outlet of the first centrifuge 302) undergoes the first flocculation and sedimentation in the first liquid storage section 4.

[0063] (2) The recovered liquid after the first flocculation and sedimentation is transported to the first filtration section 5 by a plunger pump for the first filtration.

[0064] (3) The recovered liquid after the first filtration undergoes a second flocculation and sedimentation in the second storage section 6.

[0065] (4) The recovered liquid after the second flocculation and sedimentation is pumped to the second filter 7 for secondary filtration to obtain the recovered liquid that meets the purification requirements, and then output to the third storage section 8 for storage and backup.

[0066] The usage method in this embodiment is based on the usage method in Embodiment 1 or Embodiment 2, with the addition of the following steps: Step 1: Start the plunger pump before the first filter section 5 to transport the recovered liquid after the first flocculation and sedimentation in the first storage section 4 (i.e. the liquid output from the liquid phase outlet of the first centrifuge 302) to the first filter section 5 for the first filtration. Step 2: The recovered liquid output from the first filtration section 5 after the first filtration is transported to the second storage section 6 for a second flocculation and sedimentation. Step 3: Start the plunger pump before the second filter section 7 to transport the recovered liquid after the second flocculation and sedimentation to the second filter section 7 for secondary filtration. The recovered liquid that meets the purification requirements is then transported to the third storage section 8 for temporary storage by a centrifugal pump.

[0067] The recovered liquid temporarily stored in the third liquid storage section 8 is centrifuged again by a centrifugal pump before being transported to the recovery liquid use workshop for recycling.

[0068] In this embodiment, to minimize the presence of fine particles and fibers in the recovered liquid, only the supernatant is collected for filtration and recovery when extracting the recovered liquid from the first storage section 4 and the second storage section 6. This effectively reduces the clogging of the filter pores of the plate and frame filter press by fine particles or fibers during filtration. The remaining liquid in the first storage section 4 and the second storage section 6 after extracting the supernatant can be recovered a second time by soaking again, or by evaporation, solidification, and regranulation for secondary recovery.

[0069] In addition, other optimization schemes that can be adopted in the utility model include: (1) A storage box or tank for storing crushed waste rubber particles is added between the crushing section 2 and the leaching section 3, so as to ensure that the waste rubber particles enter the first soaking pool 301 at the same time, which can facilitate accurate timing of soaking time and better ensure that the solvent content in the final waste rubber particles is relatively consistent.

[0070] (2) Multiple sets of shredding devices 201 and crushing devices 202 are set in the crushing section 2 to further improve the effect of waste rubber crushing.

[0071] (3) The crushing device 202 is set as two crushers connected in series to perform graded crushing, so that the waste glue particles obtained are more uniform in size; (4) At the outlet of the crushing section 2, a granulation device is added to regenerate waste rubber particles smaller than 1 mm into waste rubber particles of 2-5 mm, so as to reduce the possibility of them being converted into fine particles or fine fibers in the recovery liquid. (5) Multiple first centrifuges 302 and second centrifuges 304 can be installed in the leaching section 3 to improve the efficiency of liquid separation.

[0072] (4) Multiple plate and frame filter presses and matching plunger pumps can be respectively installed in the first filtration section 5 and the second filtration section 7 to improve the efficiency of filtration of the recovered liquid.

[0073] In actual production, the naming of each component is usually as follows: the first soaking tank 301 is the No. 1 waste glue tank, the first centrifuge 302 is the No. 1 centrifuge, the second soaking tank 303 is the No. 2 waste glue tank, the second centrifuge 304 is the No. 2 centrifuge, the first liquid storage section 4 is the pit, the second liquid storage section 6 is the buffer tank, and the third liquid storage section 8 is the storage tank or liquid storage pool in the solvent workshop or recycling workshop, etc. It can be seen that in the actual production process, how the first liquid storage section 4, the second liquid storage section 6, and the third liquid storage section 8 are named does not affect their specific functional technical features. Therefore, structures, devices, or equipment with the same, similar, or corresponding technical effects are all applicable to this embodiment.

[0074] It should be noted that in this utility model, the conveying of waste glue or waste glue particles is usually done by a conveyor belt, the conveying of cleaning liquid or recovery liquid is done by a water pipe, and when conveying a solid-liquid mixture containing waste glue particles, a lift pump is used according to its characteristics and the needs of subsequent processes. For example, a lift pump is used between the waste glue tank and the centrifuge, a pneumatic lift pump is used between the porridge pulverizer and the waste glue tank, and a plunger pump is used between the pit and the plate and frame filter press. Of course, any mechanism, device or equipment that can meet the actual process needs and achieve the corresponding function is applicable to this utility model.

[0075] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A continuous online treatment device for lyocell waste glue, characterized in that, The waste rubber treatment process includes a crushing section (2), an leaching section (3), and a first storage section (4) that are arranged and connected in sequence. The crushing section (2) includes a shredding device (201) and a crushing device (202). The outlet of the shredding device (201) is connected to the inlet of the crushing device (202). The leaching section (3) includes a first soaking tank (301) and a first centrifuge (302). The first soaking tank (301) is connected to the first centrifuge (302) through a booster pump. The liquid phase outlet of the first centrifuge (302) is connected to the inlet of the first storage section (4).

2. The continuous online treatment device for Lyocell waste glue according to claim 1, characterized in that, It is also provided with a feeding section (1), which includes a feeding device (101) and a screening device (102). The feeding device (101) is located above the screening device (102) and is connected to the inlet of the screening device (102) through the feeding port provided below it. The screening device (102) is provided with at least a screen with a mesh size of 5~10mm. The screening device (102) is provided with two outlets with different discharge particle sizes. The outlet with the larger discharge particle size is connected to the inlet of the shredding device (201), and the outlet with the smaller discharge particle size is connected to the inlet of the crushing device (202).

3. The continuous online treatment device for Lyocell waste glue according to claim 2, characterized in that, The feeding port is equipped with a movable partition that restricts the feeding of materials.

4. The continuous online treatment device for Lyocell waste glue according to claim 2, characterized in that, The feeding section (1) is also provided with a feed inlet (103) for waste porridge, and the crushing section (2) is provided with a porridge crusher (203). The inlet of the porridge crusher (203) is connected to the feed inlet (103), and the outlet of the porridge crusher (203) is connected to the first soaking tank (301).

5. The continuous online treatment device for Lyocell waste glue according to claim 1, characterized in that, The crushing device (202) is equipped with a sorting mechanism with a screen aperture of 2~5mm.

6. The continuous online treatment device for lyocell waste glue according to claim 1, characterized in that, The leaching section (3) is also provided with a second soaking tank (303) and a second centrifuge (304). The inlet of the second soaking tank (303) is connected to the solid phase outlet of the first centrifuge (302). The second soaking tank (303) is connected to the inlet of the second centrifuge (304) through a second booster pump. The liquid phase outlet of the second centrifuge (304) is connected to the first soaking tank (301).

7. The continuous online treatment device for Lyocell waste glue according to claim 6, characterized in that, The outlet of the first liquid storage section (4) is also provided with a first filtration section (5), a second liquid storage section (6), a second filtration section (7) and a third liquid storage section (8) connected in sequence. The first filtration section (5) includes at least one plate and frame filter press. The inlet of the plate and frame filter press is connected to the first liquid storage section (4) through a plunger pump. The outlet of the plate and frame filter press is connected to the second liquid storage section (6). A centrifugal pump is provided between the second filtration section (7) and the third liquid storage section (8).

8. The continuous online treatment device for Lyocell waste glue according to claim 7, characterized in that, The first soaking tank (301), the first liquid storage section (4), the second liquid storage section (6) and the third liquid storage section (8) are all equipped with sampling ports for testing.

9. A continuous online treatment device for lyocell waste glue according to any one of claims 1 to 8, characterized in that, Both the crushing device (202) and the first soaking tank (301) are equipped with inlets that are connected to the outlet of the condensate pipe or the outlet of the condensate storage device.

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