Polymer reduction and recovery system device for waste cotton fabrics

Abstract

The utility model provides a polymer reduction and recovery system device for waste cotton fabrics, and relates to the technical field of cotton fabric recovery equipment. The polymer reduction and recovery system device comprises a crushing device, a disinfection device, a sterilization device, a polymer reduction device and a drying device, according to the scheme, the polymerization reduction effect and efficiency can be improved, and heavy metal pollution of water is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cotton fabric recycling equipment, and particularly relates to a depolymerization recycling system device for waste cotton fabrics. Background Technique

[0002] With the development of the textile industry and the substantial improvement of people's material needs, the replacement frequency of various fashionable clothes has accelerated, and a large amount of domestic waste textiles are generated every year. At present, the recovery rate of various textile cotton fibers is relatively low globally, and the comprehensive utilization rate is relatively low. Cotton fiber is a natural polymer organic matter, which has advantages such as good air permeability and moisture absorption, and is quite popular among consumers. It is found through research that the proportion of cotton fiber in waste textiles is relatively high. Due to current technical reasons and other factors, most waste textiles still adopt low-value-added recovery methods such as incineration, which will also bring problems such as air pollution and do not conform to the current global advocated concept of green sustainable development.

[0003] For the reuse of cotton textiles, it is generally necessary to first reduce the degree of polymerization of cotton fibers. Among the equipment for reducing the degree of polymerization of cotton fibers, currently, alkaline reagents such as sodium hydroxide and potassium hydroxide are generally used to fully mix with waste cotton fibers, and the depolymerization effect of waste cotton fibers is achieved by means of high temperature and high alkalinity. However, during the depolymerization process using the alkali method, a large amount of black waste liquid will be generated, seriously polluting the water environment and instead increasing the environmental governance cost. In addition, during the process of adding the alkali solution, it is easy to cause alkali burns to operators, etc., and there are certain safety hazards. The current cotton fabric depolymerization recycling system has a complex structure, and the depolymerization effect is poor and the efficiency is low, resulting in poor quality of the recycled cotton fabrics. Content of the Utility Model

[0004] The utility model discloses a depolymerization recycling system device for waste cotton fabrics, aiming to improve the problems mentioned above.

[0005] The utility model adopts the following scheme:

[0006] A depolymerization recycling system device for waste cotton fabrics includes: a crushing device, a disinfection device, a sterilization device, a depolymerization device, and a drying device; wherein,

[0007] The crushing device includes a biomass fiber cutting machine arranged in a crushing chamber for crushing waste cotton fabrics, and the disinfection device is arranged above the crushing chamber to spray a disinfectant during crushing;

[0008] The sterilization device includes a sterilization chamber connected to the crushing chamber. The sterilization chamber is connected with a steam generating device and a third water inlet, and the steam generating device is adapted to provide steam to the sterilization chamber to increase the temperature of the sterilization chamber;

[0009] The depolymerization device includes a reaction chamber connected to the sterilization device. The reaction chamber is provided with a catalyst feed pipeline and a degradation aid feed pipeline for supplying a catalyst or a degradation aid to the reaction chamber. The reaction chamber is provided with an ultrasonic device to reduce the degree of polymerization of the cotton fabric slurry in the reaction chamber.

[0010] The drying device is connected to the reaction chamber for drying the depolymerized cotton fabric slurry.

[0011] Further, the disinfection device includes a first spraying device which stores an alcohol disinfectant for spraying and disinfecting when the cotton fabric is broken.

[0012] Further, a pressure gauge, a thermometer and a timer are arranged in the sterilization chamber. The pressure gauge is suitable for monitoring the pressure in the sterilization chamber, the thermometer is suitable for monitoring the temperature in the sterilization chamber, and the timer is suitable for timing the time of high-pressure and high-temperature sterilization.

[0013] Further, a stirring device is arranged in the sterilization chamber to improve the sterilization efficiency.

[0014] Further, the ultrasonic device is arranged at the bottom of the reaction chamber, and a heating device is also arranged in the reaction chamber to heat the reaction chamber.

[0015] Further, a second spraying device and a drying device are also arranged in the drying chamber. The second spraying device is suitable for spraying water before drying to filter out impurities on the fabric surface, and the drying device is suitable for heating and drying the cotton fabric.

[0016] Further, the catalyst feed pipeline is suitable for introducing a 0.1% - 5% chloride catalyst.

[0017] Further, the lower part of the crushing chamber is connected to the upper part of the sterilization chamber through a pipeline, and the bottom of the sterilization chamber is connected to the upper part of the reaction chamber through a pipeline; the bottom of the reaction chamber is connected to the upper part of the drying chamber through a pipeline.

[0018] Beneficial effects:

[0019] In this embodiment, while the crushing device is used for crushing, disinfection is carried out, and then it is transported to the sterilization chamber for sterilization in a high-temperature and high-pressure environment. Then, the sterilized cotton fabric is transported to the reaction chamber, where under the action of a chloride catalyst and an additive, ultrasonic waves generated by the ultrasonic device are used to assist in depolymerization to improve the efficiency and effect of depolymerization. Finally, cleaning and drying are carried out, which can reduce the degree of polymerization of the cotton fabric, and no black liquor is generated during the whole process. This also eliminates the thorny problem of black liquor treatment for the comprehensive utilization of cotton fabric, and avoids problems such as heavy metal pollution in the water environment, thus greatly reducing the subsequent pollution treatment expenses. Brief Description of the Drawings

[0020] Figure 1 FIG. is a schematic structural diagram of a depolymerization and recycling system device for waste cotton fabrics according to an embodiment of the present invention;

[0021] Reference numerals: crushing device 1, crushing chamber 11, biomass fiber cutting machine 12, disinfection device 13, receiving plate 14, filter plate 15, first water inlet 16, second water inlet 17, sterilization device 2, sterilization chamber 21, steam generating device 22, stirring device 23, third water inlet 24, depolymerization device 3, reaction chamber 31, catalyst supply pipeline 32, degradation aid supply pipeline 33, ultrasonic device 34, heating device 35, fourth water inlet 36, drying device 4, water filtering plate 41, drying device 42, second spraying device 43, sedimentation tank 5. Detailed Embodiments

[0022] Embodiment 1

[0023] Combined with Figure 1 , this embodiment provides a depolymerization and recycling system device for waste cotton fabrics, including: a crushing device 1, a disinfection device 13, a sterilization device 2, a depolymerization device 3, and a drying device 4; wherein, the crushing device 1 includes a biomass fiber cutting machine 12 disposed in the crushing chamber 11 for crushing waste cotton fabrics, and the disinfection device 13 is disposed above the crushing chamber 11 to spray disinfectant during crushing; the sterilization device 2 includes a sterilization chamber 21 connected to the crushing chamber 11, and the sterilization chamber 21 is connected with a steam generating device 22 and a third water inlet 24, and the steam generating device 22 is adapted to provide steam to the sterilization chamber 21 to increase the temperature of the sterilization chamber 21; the depolymerization device 3 includes a reaction chamber 31 connected to the sterilization device 2, and the reaction chamber 31 is provided with a catalyst supply pipeline 32 and a degradation aid supply pipeline 33 for supplying a catalyst or a degradation aid to the reaction chamber 31; the reaction chamber 31 is provided with an ultrasonic device 34 to reduce the degree of polymerization of the cotton fabric slurry in the reaction chamber 31; the drying device 4 is connected to the reaction chamber 31 for drying the depolymerized cotton fabric slurry.

[0024] In this embodiment, the crushing device 1 includes a crushing chamber 11, in which a biomass fiber cutting machine 12 is provided. A plurality of blades are provided on the biomass fiber cutting machine 12 to crush the worn cotton fabrics put into the crushing chamber 11. Here, the fiber crusher can adopt the existing crushing device 1. A receiving plate 14 inclined downward in the first direction is provided below the biomass fiber cutting machine 12. One end of the receiving plate 14 is provided with a first water inlet 16 for flushing the cotton fabric fragments falling on the receiving plate 14 and washing the cotton fabrics towards the filter plate 15 at the same time. The filter plate 15 is inclined downward in the second direction. Dense water filtering holes are provided on the filter plate 15 to allow water and impurities to be discharged through the water filtering holes. Here, the included angle between the first direction and the second direction is an obtuse angle, and the second direction faces the direction of the sterilization chamber 21, which is conducive to the cotton fabrics entering the sterilization chamber 21 through the pipeline after being washed. A second water inlet 17 is provided on the side of the filter plate 15 away from the sterilization chamber 21 for flushing the cotton fabrics on the filter plate 15 and washing the cotton fabrics towards the sterilization chamber 21. The crushing chamber 11 is provided with a horn-shaped outlet on the side close to the sterilization chamber 21 for connecting the pipeline and facilitating the entry of the cotton fabric fragments into the sterilization chamber 21. Preferably, a disinfection device 13 is further provided in the crushing chamber 11. The disinfection device 13 includes a first spraying device which stores alcohol disinfectant for spraying and disinfecting when crushing the cotton fabrics. Spraying alcohol by the disinfection device 13 can disinfect the cotton fabrics, and alcohol has little pollution to water and is easy to be treated.

[0025] The sterilization chamber 21 is arranged below the outlet of the crushing chamber 11, facilitating the entry of the cotton fabrics by gravity. The sterilization chamber 21 is connected with a steam generating device 22 to provide a high-temperature and high-pressure environment in the sterilization chamber 21 for sterilizing the cotton fabrics. A pressure gauge, a thermometer and a timer are further provided in the sterilization chamber 21. The pressure gauge is suitable for monitoring the pressure in the sterilization chamber 21, the thermometer is suitable for monitoring the temperature in the sterilization chamber 21, and the timer is suitable for timing the high-temperature and high-pressure sterilization time. A stirring device 23 is provided in the sterilization chamber 21. The stirring device 23 can make the cotton fabrics fully exposed to the high-temperature and high-pressure environment through stirring to improve the sterilization efficiency. A third water inlet 24 is further provided in the sterilization chamber 21 for flushing and washing the cotton fabrics to the reaction chamber 31.

[0026] The depolymerization device 3 includes a reaction chamber 31 which is arranged below the sterilization chamber 21, facilitating the conveyance of the cotton fabric in the sterilization chamber 21 into the reaction chamber 31. The reaction chamber 31 is connected with a catalyst feed pipeline 32 and a depolymerization aid feed pipeline 33 for supplying a catalyst or a depolymerization aid to the reaction chamber 31. In this embodiment, the catalyst feed pipeline 32 can be used to introduce a 0.1% - 5% chloride catalyst, such as cobalt chloride; the depolymerization aid pipeline can input the HB-3803L aid. Additionally, a fourth water inlet 36 is provided in the reaction chamber 31, through which demineralized water can be introduced for flushing. The depolymerization device 3 further includes an ultrasonic device 34 and a heating device 35 arranged at the bottom of the reaction chamber 31. Under ultrasonic conditions, the chloride catalyst and the depolymerization aid can achieve a better depolymerization effect and improve the depolymerization efficiency. The temperature environment in the reaction chamber 31 can be adjusted through the heating device 35. Preferably, a stirring device 23 is also arranged in the reaction chamber 31 to improve the mixing effect.

[0027] The drying chamber is connected below the reaction chamber 31 through a pipeline, facilitating the conveyance of the cotton fabric in the reaction chamber 31 into the drying chamber. A water filtering plate 41 is arranged at the bottom of the drying chamber to facilitate water filtering after the cotton fabric slurry enters the drying chamber. Meanwhile, a second spraying device 43 is arranged above the drying chamber. The second spraying device 43 is adapted to spray water on the cotton fabric to remove surface impurities of the cotton fabric before drying. Then, after being filtered by the water filtering plate 41, the cotton fabric is dried by heating through the drying device 42. The drying device 42 can adopt existing blast drying equipment, which will not be elaborated here.

[0028] Pipes are arranged at the bottoms of both the crushing chamber and the drying chamber to convey wastewater to a sedimentation tank 5 for wastewater treatment.

[0029] Through the solution of this embodiment, on the one hand, the overall structure is simple, and through the top-down arrangement, the difficulty of material conveyance can be reduced. In the crushing device 1, by arranging the material receiving plate 14 and the water filtering plate 41, the cleaning effect can be improved and preliminary filtration can be carried out to prevent dirty water from entering the subsequent processes. On the other hand, in the depolymerization process of this solution, an ultrasonic device 34 is used to provide ultrasonic conditions. After inputting the chloride catalyst and the depolymerization aid, the depolymerization efficiency can be improved. No black liquor is generated during the whole process, and the generated waste liquid is convenient to be treated. Environmental pollution can be reduced and enterprise costs can be decreased.

[0030] Embodiment 2

[0031] In this embodiment, through the above-mentioned processing system, an experimental embodiment is provided. Specifically, waste cotton fabric from domestic sources is put into the crushing device 1, prepared into a shape of 10 cm * 2 cm by a fiber cutting mechanism, and sprayed with a 1.0% - 20% ethanol solution, and the surface of the cotton fabric is cleaned with flowing water.

[0032] During the high-pressure steam sterilization process, the preliminarily prepared strip-shaped cotton fabric is put into the sterilization device 2 and sterilized under the conditions of a pressure of 0.2 - 1.0 Mpa and a temperature of 100 - 135 °C for 10 - 60 minutes.

[0033] In the reaction chamber 31, 0.1% - 5% cobalt chloride, the auxiliary agent HB-3803L, and the sterilized cotton fabric are added. The volume ratio of demineralized water to the depolymerization auxiliary agent is controlled at 10:1. The whole process of depolymerization in the reaction chamber 31 is subjected to ultrasonic treatment, and the temperature is controlled at 30 °C - 90 °C, and continuous stirring treatment is carried out. After depolymerization, the above-mentioned cotton fabric is subjected to drying treatment.

[0034] In the preferred embodiment, when depolymerization is carried out in the reaction chamber 31, an appropriate amount of cobalt chloride, demineralized water, and HB-3803L are added to the reaction chamber 31. Specifically, the volume ratio of demineralized water to HB-3803L is 10:1, and the weight ratio of cobalt chloride to the cotton fabric is 0.05:1. It is treated in ultrasonic at 40 °C for 30 minutes, then the heating device 35 is started to heat to 85 °C and maintained for 90 minutes. After completion, it is rinsed with flowing water multiple times and dried in a drying chamber at 60 °C for 4 hours. Through this scheme, the degree of polymerization of the cotton fabric can be relatively reduced by 30.2%, and the depolymerization effect reaches the best.

[0035] Through this scheme, no black liquor is generated during the whole process of depolymerization of the cotton fabric, avoiding problems such as water environment pollution, thus greatly reducing the subsequent pollution treatment cost, and the depolymerization effect is good.

[0036] It should be understood that the above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention.

[0037] The above introduction to the drawings used in the embodiments only shows some embodiments of the present invention and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

Claims

1. A depolymerization and recycling system device for waste cotton fabrics, characterized in that, Including: A crushing device, a disinfection device, a sterilization device, a depolymerization device, and a drying device; wherein, The crushing device includes a biomass fiber cutting machine disposed in a crushing chamber for crushing waste cotton fabrics, and the disinfection device is disposed above the crushing chamber to spray a disinfectant during crushing; The sterilization device includes a sterilization chamber connected to the crushing chamber. The sterilization chamber is connected to a steam generating device and a third water inlet. The steam generating device is adapted to supply steam to the sterilization chamber to increase the temperature of the sterilization chamber; The depolymerization device includes a reaction chamber connected to the sterilization device. The reaction chamber is provided with a catalyst feed pipeline and a degradation aid feed pipeline for supplying a catalyst or a degradation aid to the reaction chamber; The reaction chamber is provided with an ultrasonic device to reduce the degree of polymerization of the cotton fabric slurry in the reaction chamber; The drying device is connected to the reaction chamber for drying the depolymerized cotton fabric slurry.

2. The depolymerization and recycling system device for waste cotton fabrics according to claim 1, wherein, The disinfection device includes a first spraying device that stores an alcohol disinfectant for spraying and disinfecting when crushing cotton fabrics.

3. The depolymerization recovery system device for waste cotton fabrics according to claim 1, characterized in that, A pressure gauge, a thermometer, and a timer are provided in the sterilization chamber. The pressure gauge is adapted to monitor the pressure in the sterilization chamber, the thermometer is adapted to monitor the temperature in the sterilization chamber, and the timer is adapted to time the high-pressure and high-temperature sterilization time.

4. The depolymerization and recycling system device for waste cotton fabrics according to claim 3, wherein, A stirring device is provided in the sterilization chamber to improve the sterilization efficiency.

5. The depolymerization and recycling system device for waste cotton fabrics according to claim 1, characterized in that, The ultrasonic device is disposed at the bottom of the reaction chamber, and a heating device is further provided in the reaction chamber to heat the reaction chamber.

6. The depolymerization and recycling system device for waste cotton fabrics according to claim 1, characterized in that, A drying chamber is provided below the reaction chamber. A second spraying device and a drying device are further provided in the drying chamber. The second spraying device is adapted to spray water before drying to filter impurities on the surface of the cotton fabric, and the drying device is adapted to heat and dry the cotton fabric.

7. The depolymerization and recycling system device for waste cotton fabrics according to claim 1, characterized in that, The catalyst feed pipeline is adapted to introduce a 0.1% - 5% chloride catalyst.

8. The depolymerization and recycling system device for waste cotton fabrics according to claim 6, characterized in that, The lower part of the crushing chamber is connected to the upper part of the sterilization chamber through a pipeline, and the bottom of the sterilization chamber is connected to the upper part of the reaction chamber through a pipeline; The bottom of the reaction chamber is connected to the upper part of the drying chamber through a pipeline.

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