Production system of cane syrup for producing lyocell fibers

Abstract

The utility model discloses a production system of cane syrup for lyocell fibers, which belongs to the technical field of lyocell fiber production equipment and comprises a high-concentration alkali treatment unit, a low-concentration alkali treatment unit, a chlorine dioxide bleaching unit, an alkali extraction unit, a hydrogen peroxide bleaching unit, an acid pickling unit and a dryer which are sequentially connected through pipelines. According to the production system, the bagasse can be used as the raw material to prepare the cane syrup meeting the requirements of producing the lyocell fiber raw material, and the production system can realize continuous and industrial production.

Description

A production system for producing sugarcane pulp for lyocell fiber Technical Field

[0001] This utility model belongs to the technical field of lyocell fiber production equipment, specifically relating to a production system for producing sugarcane pulp for lyocell fiber. Background Technology

[0002] Lyocell fiber is a new type of regenerated cellulose fiber, hailed as the green fiber of the 21st century. It is produced by directly dissolving pulp raw materials in N-methylmorpholine-N-oxide (NMMO) as a solvent to form a spinning solution without chemical reaction, followed by a dry-jet wet-spinning process. Lyocell fiber is not only soft, silky, breathable, and lustrous, but also possesses superior mechanical properties and moisture absorption, making it widely used in many textile fields. Currently, lyocell fiber production mainly uses wood raw materials, with the majority being imported wood pulp. To address the reliance on imported wood pulp, research into using other raw materials for lyocell fiber production has begun in recent years in China.

[0003] Sugarcane bagasse, a major byproduct of sugarcane processing, is a typical agricultural and forestry waste, currently mainly used as boiler fuel and papermaking raw material, with low added value. However, sugarcane bagasse is rich in cellulose, with a cellulose content of approximately 40-50%, making it a potential raw material for the production of lyocell fiber. Currently, pulping technologies using sugarcane bagasse are primarily focused on paper pulp production; technologies for using sugarcane bagasse to produce lyocell fiber are relatively few. Furthermore, most sugarcane bagasse pulp production still follows the cooking process in papermaking, requiring high temperature and pressure conditions, resulting in high equipment energy consumption and certain operational safety risks. Existing technologies do not disclose a production system for preparing lyocell fiber pulp using sugarcane bagasse. Summary of the Invention

[0004] The present invention aims to provide a production system for sugarcane pulp for lyocell fiber, which is applicable to the process of producing sugarcane pulp for lyocell fiber using bagasse as raw material. The system has a reasonable equipment layout and can realize continuous production.

[0005] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0006] A sugarcane pulp production system for lyocell fiber includes a high-concentration alkali treatment unit, a low-concentration alkali treatment unit, a chlorine dioxide bleaching unit, an alkali extraction unit, a hydrogen peroxide bleaching unit, an acid washing unit, and a dryer connected in sequence by pipelines.

[0007] The high-concentration alkali treatment unit includes a spray device, an alkali treatment device I for holding high-concentration alkali solution, a pulp pump I, and a pulp washer I, which are connected in sequence by pipelines.

[0008] The low-concentration alkali treatment unit includes a screw conveyor I, an alkali treatment device II for holding low-concentration alkali solution, a slurry pump II, a desander and a slurry washer II connected in sequence by pipelines;

[0009] The chlorine dioxide bleaching unit includes a screw conveyor II, a screw pump I, an upflow bleaching tower I, a downflow bleaching tower I, a slurry pump III, and a slurry washer III, which are connected in sequence by pipelines.

[0010] The alkali extraction unit includes an alkali extraction mixing tank, a slurry pump IV, and a slurry washer IV, which are connected in sequence by pipelines.

[0011] The hydrogen peroxide bleaching unit includes a mixer, screw pump II, upflow bleaching tower II, downflow bleaching tower II, and washing machine V, which are connected in sequence by pipelines.

[0012] The pickling unit includes a pickling mixing tank, a slurry pump V, and a slurry washer VI, which are connected in sequence by pipelines.

[0013] Furthermore, both the alkali treatment device I and the alkali treatment device II are equipped with a stirring mechanism, and both the alkali treatment device I and the alkali treatment device II have built-in or external heating structures.

[0014] Furthermore, the alkali treatment device I and alkali treatment device II are steaming balls.

[0015] Furthermore, the front end of the spraying device is connected to a cyclone separator and a fan via pipelines.

[0016] Furthermore, a flow guide is provided between the spraying device and the alkali treatment device I.

[0017] Furthermore, a double-disc refining machine is installed between the slurry pump I and the slurry washer I.

[0018] Furthermore, washing machines I, II, III, IV, V, and VI are all double-roll washing machines.

[0019] Furthermore, a pump riser is provided between the screw conveyor II and the screw pump I.

[0020] Furthermore, a slurry storage tank I is provided between alkali treatment unit I and slurry pump I; a slurry storage tank II is provided between alkali treatment unit II and slurry pump II.

[0021] Furthermore, screw conveyor I is equipped with inlet I for adding water, alkali solution and hydrogen peroxide; screw conveyor II is equipped with inlet II for adding water, chlorine dioxide and hydrochloric acid; alkali extraction mixing tank is equipped with inlet III for adding water, alkali solution and hydrogen peroxide; mixer is equipped with inlet IV for adding water, hydrogen peroxide and alkali solution; pickling mixing tank is equipped with inlet V for adding water, acid and complexing agent.

[0022] The beneficial effects of this utility model are:

[0023] I. This utility model proposes a production system for sugarcane pulp used in lyocell fiber production. This system is applicable to the production of lyocell fiber sugarcane pulp using bagasse as raw material. It involves a high-concentration alkali treatment unit and a low-concentration alkali treatment unit, enabling two-stage alkali treatment of the bagasse raw material. Furthermore, both the chlorine dioxide bleaching unit and the hydrogen peroxide bleaching unit utilize a combination of upflow and downflow bleaching towers, facilitating control of the bleaching process and achieving the goal of producing stable-performance sugarcane pulp. The system features a rational equipment layout, allows for continuous production, and has relatively low requirements for production equipment.

[0024] II. In this utility model, both the alkali treatment device I and the alkali treatment device II are equipped with a stirring mechanism to improve the mixing efficiency of sugarcane bagasse raw materials with alkali solution, hydrogen peroxide and other reagents. The alkali treatment device I and the alkali treatment device II are equipped with a built-in or external heating structure to control the temperature of the materials in the device within a preset range.

[0025] III. In this utility model, both the alkali treatment device I and the alkali treatment device II use steaming balls. The spheres of the steaming balls facilitate thorough mixing of raw materials with solvents / reagents such as water, alkali solution, and hydrogen peroxide. They also have the advantages of relatively uniform slurry quality, low liquid ratio, high solution concentration, shortened cooking time, simple equipment, low investment, and easy management and maintenance.

[0026] IV. In this utility model, the front end of the spraying device is connected to a cyclone separator via a pipeline, which is used to further separate and process the bagasse raw material and remove the residual juice in the bagasse raw material.

[0027] V. In this utility model, a guide is provided between the spraying device and the alkali treatment device I, which is used to introduce the alkali solution, hydrogen peroxide and other reagents added from the spraying device into the alkali treatment device I.

[0028] VI. In this utility model, a double-disc grinder is provided between the pulp pump I and the pulp washing machine I. The double-disc grinder is used to further grind the sugarcane bagasse after the first alkali treatment.

[0029] VII. In this utility model, washing machines I, II, III, IV, V, and VI are all double-roll washing machines. The wedge-shaped area between the two rolls of the double-roll washing machine is used for the passage of pulp. Under mechanical extrusion and gravity, the liquid is discharged from the roller surface filter, while the pulp is retained and moves with the roller surface to the discharge port for further processing. Double-roll washing machines facilitate continuous operation, have high production efficiency, simple structure, and are easy to maintain. They also facilitate the addition of sensors and other components to achieve online monitoring of materials and realize automated production.

[0030] 8. In this utility model, a pump riser is provided between the screw conveyor II and the screw pump I to match the net positive suction head requirement of the pump, prevent cavitation, reduce the impact of pump start-up and shutdown or water hammer on the main pipeline, ensure that the fluid enters the pump chamber of the screw pump I smoothly, and facilitate the maintenance of equipment on the pipeline.

[0031] 9. In this utility model, a slurry storage tank I is provided between the alkali treatment device I and the slurry pump I; a slurry storage tank II is provided between the alkali treatment device II and the slurry pump II. The slurry storage tank I and the slurry storage tank II are intermediate buffer devices used to temporarily store intermediate materials, so as to facilitate the stable delivery of materials to the downstream end through the conveying pump and ensure the quality of the finished product. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the structure of this utility model.

[0033] Figure 2 is a schematic diagram of another embodiment of the production system for producing sugarcane pulp for lyocell fiber.

[0034] The components include: 1. Fan; 2. Cyclone separator; 3. Spraying device; 4. Flow guide; 5. Alkali treatment device I; 6. Slurry storage tank I; 7. Slurry pump I; 8. Double disc refiner; 9. Slurry washer I; 10. Screw conveyor I; 11. Alkali treatment device II; 12. Slurry storage tank II; 13. Slurry pump II; 14. Sand remover; 15. Slurry washer II; 16. Screw conveyor II; 17. Pump riser; 18. Screw pump I; 19. Upflow bleaching tower I; 20. Downflow bleaching tower I; 21. Slurry pump III; 2 2. Washing machine III; 23. Alkali extraction mixing tank; 24. Slurry pump IV; 25. Washing machine IV; 26. Mixer; 27. Screw pump II; 28. Upflow bleaching tower II; 29. ​​Downflow bleaching tower II; 30. Washing machine V; 31. Acid washing mixing tank; 32. Slurry pump V; 33. Washing machine VI; 34. Dryer; 3.1. Reagent inlet; 3.2. Material inlet; 10.1. Inlet I; 16.1. Inlet II; 23.1. Inlet III; 26.1. Inlet IV; 31.1. Inlet V. Detailed Implementation

[0035] 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.

[0036] Example 1

[0037] A sugarcane pulp production system for lyocell fiber includes a high-concentration alkali treatment unit, a low-concentration alkali treatment unit, a chlorine dioxide bleaching unit, an alkali extraction unit, a hydrogen peroxide bleaching unit, an acid washing unit, and a dryer 34, which are connected in sequence by pipelines.

[0038] Referring to Figure 1, the high-concentration alkali treatment unit includes a spray device 3, an alkali treatment device I5 for holding high-concentration alkali solution, a pulp pump I7, and a pulp washer I9 connected in sequence by pipelines;

[0039] The low-concentration alkali treatment unit includes a screw conveyor I10, an alkali treatment device II11 for holding low-concentration alkali solution, a slurry pump II13, a desander 14, and a slurry washer II15, which are connected in sequence by pipelines.

[0040] The chlorine dioxide bleaching unit includes a screw conveyor II16, a screw pump I18, an upflow bleaching tower I19, a downflow bleaching tower I20, a slurry pump III21, and a slurry washer III22, which are connected in sequence by pipelines.

[0041] The alkali extraction unit includes an alkali extraction mixing tank 23, a slurry pump IV 24, and a slurry washer IV 25 connected in sequence by pipelines.

[0042] The hydrogen peroxide bleaching unit includes a mixer 26, a screw pump II 27, an upflow bleaching tower II 28, a downflow bleaching tower II 29, and a washer V 30, which are connected in sequence by pipelines.

[0043] The pickling unit includes a pickling mixing tank 31, a slurry pump V 32, and a slurry washer VI 33 connected in sequence by pipelines.

[0044] Preferably, the screw conveyor I10 is provided with an inlet I10.1 for adding water, alkali solution and hydrogen peroxide; the screw conveyor II16 is provided with an inlet II16.1 for adding water, chlorine dioxide and hydrochloric acid; the alkali extraction mixing tank 23 is provided with an inlet III23.1 for adding water, alkali solution and hydrogen peroxide; the mixer 26 is provided with an inlet IV26.1 for adding water, hydrogen peroxide and alkali solution; and the pickling mixing tank 31 is provided with an inlet V31.1 for adding water, acid and complexing agent.

[0045] In use, sugarcane bagasse, a byproduct of sugarcane sugar production, is used as raw material. It enters the spraying device 3 through the material inlet 3.2. Water, alkali solution, and hydrogen peroxide are added through the reagent inlet 3.1 of the spraying device 3. The high-concentration alkali solution and other reagents enter the alkali treatment unit I5 together with the sugarcane bagasse. After the first high-concentration alkali treatment, the material is pumped by the slurry pump I7 to the pulp washer I9 for washing and separation. The material is then sent to the alkali treatment unit II11 via the screw conveyor I10 of the low-concentration alkali treatment unit. Water and low-concentration alkali solution are added through the inlet I10.1 of the screw conveyor I10. Alkali solution and hydrogen peroxide are mixed with the material and other reagents in the alkali treatment unit II11 and kept at a certain temperature for a certain period of time. After treatment with the low-concentration alkali solution, the material is then transported to the sand separator 14 by the slurry pump II13 to remove most of the particulate impurities. After that, it is sent to the pulp washer II15 for washing and separation. The material is then transported to the next unit by the screw conveyor II16 of the chlorine dioxide bleaching unit. Water, chlorine dioxide and hydrochloric acid are added through the inlet II16.1 of the screw conveyor II16, and then it is stably transported to the upflow bleaching tower I19 and downflow bleaching tower I19 by the screw pump I18. Bleaching is carried out in bleaching tower I 20. The bagasse bleached with chlorine dioxide is then pumped by slurry pump III 21 to pulp washer III 22 for washing and separation. The material is then sent to the alkali extraction mixing tank 23 of the alkali extraction unit, where water, alkali solution, and hydrogen peroxide are added through inlet III 23.1 for alkali extraction. The treated bagasse is then pumped by slurry pump IV 24 to pulp washer IV 25 for washing and separation. The bagasse material continues to be sent to the mixer 26 of the hydrogen peroxide bleaching unit, where water, hydrogen peroxide, and alkali solution are added through inlet IV 26.1. The bagasse and hydrogen peroxide, along with other reagents, are mixed... After thorough mixing in the mixer 26, the mixture is pumped by screw pump II 27 to the upflow bleaching tower II 28 and downflow bleaching tower II 29 for hydrogen peroxide bleaching. The bleached material is then sent to the pulp washer V 30 for washing and separation. The material is then sent to the pickling mixing tank 31 of the pickling unit for acid treatment. Water, acid and complexing agent are added to the pickling mixing tank 31 from inlet V 31.1. The acid-treated material is then pumped by pulp pump V 32 to the pulp washer VI 33 for acid treatment to obtain sugarcane pulp. The pulp is then sent to the dryer 34 for drying to obtain sugarcane pulp that can be used for the production of lyocell fiber.

[0046] The sugarcane pulp production system for lyocell fiber has a reasonable equipment layout and relatively low equipment requirements. It does not require high-temperature and high-pressure cooking equipment, resulting in relatively low equipment costs. Furthermore, the system can achieve continuous and large-scale production of sugarcane pulp for lyocell fiber.

[0047] Example 2

[0048] This embodiment is a further optimization of embodiment 1. The difference is that both the alkali treatment device I5 and the alkali treatment device II11 are equipped with a stirring mechanism, and both the alkali treatment device I5 and the alkali treatment device II11 have a built-in or external heating structure.

[0049] Example 3

[0050] This embodiment is a further optimization of embodiment 1, the difference being that the alkali treatment device I5 and alkali treatment device II11 are steaming balls.

[0051] Example 4

[0052] Compared with Examples 1 to 3, the difference in this embodiment is that the front end of the spraying device 3 is connected to a cyclone separator 2 and a blower 1 through a pipeline. Referring to Figure 2, the cyclone separator 2 can be used to further remove juice from the raw sugarcane bagasse.

[0053] Example 5

[0054] Compared with Examples 1 to 4, the difference in this embodiment is that a flow guide 4 is provided between the spray device 3 and the alkali treatment device I5, as shown in Figure 2.

[0055] Example 6

[0056] Compared with Examples 1-5, this embodiment has a double-disc refiner 8 between the pulp pump I7 and the pulp washer I9, as shown in Figure 2.

[0057] Example 7

[0058] Compared with Examples 1-6, in this embodiment, washing machines I9, II15, III22, IV25, V30, and VI33 are all double-roll washing machines.

[0059] Example 8

[0060] Compared with Examples 1 to 7, this embodiment has a pump riser 17 between the screw conveyor II 16 and the screw pump I 18, as shown in Figure 2.

[0061] Example 9

[0062] Compared with Examples 1-8, referring to Figure 2, in this embodiment, a slurry storage tank I6 is provided between the alkali treatment device I5 and the slurry pump I7; a slurry storage tank II12 is provided between the alkali treatment device II11 and the slurry pump II13. The slurry storage tanks I6 and II12 are intermediate buffer devices used to temporarily store intermediate materials, so as to facilitate the stable delivery of materials to the downstream through the conveying pump and ensure the quality of the finished product.

[0063] Example 10

[0064] To facilitate public understanding of this solution, this embodiment uses a preferred sugarcane pulp production system for lyocell fiber as an example, and further explains the solution in conjunction with the accompanying drawings.

[0065] Referring to Figure 2, the production system specifically includes six units connected in sequence by pipelines: a high-concentration alkali treatment unit, a low-concentration alkali treatment unit, a chlorine dioxide bleaching unit, an alkali extraction unit, a hydrogen peroxide bleaching unit, and an acid washing unit, as well as a dryer 34 for drying sugarcane pulp, preferably an RF dryer 34.

[0066] In this embodiment, the high-concentration alkali treatment unit includes a spray device 3, an alkali treatment device I5 for holding high-concentration alkali solution, a slurry storage tank I6, a slurry pump I7, a double-disc refiner 8, and a slurry washer I9 connected in sequence by pipelines; the front end of the spray device 3 is connected to a cyclone separator 2 and a blower 1 by pipelines; a flow guide 4 is provided between the spray device 3 and the alkali treatment device I5.

[0067] In this embodiment, the low-concentration alkali treatment unit includes a screw conveyor I10, an alkali treatment device II11 for holding low-concentration alkali solution, a slurry storage tank II12, a slurry pump II13, a sand remover 14, and a slurry washer II15 connected in sequence by pipelines. The screw conveyor I10 is provided with an inlet I10.1 for adding water, alkali solution, and hydrogen peroxide.

[0068] In this embodiment, the chlorine dioxide bleaching unit includes a screw conveyor II16, a screw pump I18, an upflow bleaching tower I19, a downflow bleaching tower I20, a slurry pump III21, and a slurry washer III22 connected in sequence by pipelines. A pump riser 17 is provided between the screw conveyor II16 and the screw pump I18. The screw conveyor II16 is provided with an inlet II16.1 for adding water, chlorine dioxide, and hydrochloric acid.

[0069] In this embodiment, the alkali extraction unit includes an alkali extraction mixing tank 23, a slurry pump IV 24, and a slurry washer IV 25 connected in sequence by pipelines. The alkali extraction mixing tank 23 is provided with an inlet III 23.1 for adding water, alkali solution, and hydrogen peroxide.

[0070] In this embodiment, the hydrogen peroxide bleaching unit includes a mixer 26, a screw pump II 27, an upflow bleaching tower II 28, a downflow bleaching tower II 29, and a washing machine V 30 connected in sequence by pipelines. The mixer 26 is provided with an inlet IV 26.1 for adding water, hydrogen peroxide, and alkali solution.

[0071] In this embodiment, the pickling unit includes a pickling mixing tank 31, a slurry pump V 32 and a slurry washer VI 33 connected in sequence by pipelines. The pickling mixing tank 31 is provided with an inlet V 31.1 for adding water, acid and complexing agent.

[0072] In this embodiment, both the alkali treatment device I5 and the alkali treatment device II11 use steaming balls. Each steaming ball consists of a ball body, a base, a transmission device, etc., and has a loading port at its vertical center line for adding sugarcane bagasse raw materials, water, alkali solution, and hydrogen peroxide. Steam for cooking and heating is introduced through the hollow shaft, and condensate is discharged.

[0073] In this embodiment, washing machine I9, washing machine II15, washing machine III22, washing machine IV25, washing machine V30 and washing machine VI33 are all double-roll washing machines.

[0074] The steps for preparing sugarcane pulp for lyocell fiber using bagasse as raw material are as follows:

[0075] S1. Sugarcane bagasse, a byproduct of sugarcane sugar extraction, is used as raw material. The bagasse undergoes initial separation in a cyclone separator 2 to remove the juice. A blower 1 blows air into the material in the cyclone separator 2. A certain amount of high-concentration alkali solution, hydrogen peroxide, and solvent water are added through the reagent inlet 3.1 of the spray device 3. The high-concentration alkali solution, hydrogen peroxide, and solvent water then enter the alkali treatment device I5 through the feed inlet of the guide device 4. The temperature, concentration of alkali solution, and concentration of hydrogen peroxide in the alkali treatment device I5 are controlled within a preset range. The mixture is stirred in a sealed environment for a certain period. The resulting material can be temporarily stored in a slurry storage tank I6. The material is then pumped by a slurry pump I7 to a double-disc mill 8 for further processing. Finally, the material is sent to a washing machine I9 for washing and dewatering to obtain the alkalized sugarcane bagasse after the first alkali treatment.

[0076] S2. The material obtained in step S1 is conveyed to the alkali treatment device II11 via screw conveyor I10. Low-concentration alkali solution, water and hydrogen peroxide are added through the inlet I10.1 of screw conveyor I10. The temperature inside the alkali treatment device II11 is controlled within a preset range, and the concentrations of alkali solution and hydrogen peroxide inside the alkali treatment device II11 are controlled within a preset range. The mixture is stirred in a sealed environment for a certain period of time. The material obtained after treatment can be temporarily stored in the slurry storage tank II12. The material is then sent to the sand remover 14 via the slurry pump II13 to remove particulate impurities. It is then washed in the double roller washer II15 and dewatered to obtain the alkalized sugarcane bagasse after the second alkali treatment.

[0077] S3. The alkalized sugarcane bagasse after the second alkali treatment is conveyed to the upflow bleaching tower I19 via screw conveyor II16, pump riser 17, and screw pump I18. Water, chlorine dioxide, and hydrochloric acid reagent are added through inlet II16.1 of screw conveyor II16. The material undergoes the first stage of bleaching in the upflow bleaching tower I19 and downflow bleaching tower I20 in sequence. The concentration of alkali solution and hydrogen peroxide in the upflow bleaching tower I19 and downflow bleaching tower I20 are controlled within the preset range. After being stirred in a sealed environment for a certain period of time, it is then conveyed to the double roller washer III22 for washing and dewatering via slurry pump III21 to obtain sugarcane bagasse bleached with chlorine dioxide.

[0078] S4. Continue to feed the chlorine dioxide bleached sugarcane bagasse into the alkali extraction mixing tank 23. Add a certain amount of water, alkali solution and hydrogen peroxide through the inlet Ⅲ23.1 of the alkali extraction mixing tank 23, and control the concentration of alkali solution and hydrogen peroxide in the device within the preset range. Stir for a certain period of time in a sealed environment. The material after alkali extraction is sent to the pulp washing machine Ⅳ25 by the pulp pump Ⅳ24. The material is washed and dewatered to obtain the alkali-extracted sugarcane bagasse.

[0079] S5. The sugarcane bagasse after alkali extraction is sent to the mixer 26. Water, hydrogen peroxide and alkali solution are added through the inlet IV 26.1 of the mixer 26. The concentration of alkali solution and hydrogen peroxide in the mixer 26 is controlled within the preset range. The material is sent to the upflow bleaching tower II 28 through the screw pump II 27, and then to the downflow bleaching tower II 29. After bleaching for a certain period of time, it is sent to the double roller washer V 30 for washing and dewatering to obtain the sugarcane bagasse bleached with hydrogen peroxide.

[0080] S6. The sugarcane bagasse bleached in step S5 is added to the acid washing mixing tank 31 containing an acid solution of a certain concentration. Water, acid and complexing agent are added through the inlet V31.1 on the acid washing mixing tank 31. The concentration of acid and complexing agent in the device is controlled within a preset range. The mixture is treated for a certain time under certain temperature conditions. The acid-treated material is sent to the pulp washing machine VI33 by the pulp pump V32. After washing and dewatering, the acid-washed sugarcane pulp is obtained.

[0081] S7. The pickled sugarcane pulp is sent to dryer 34 and dried to obtain sugarcane pulp for lyocell fiber production.

Claims

1. A production system for producing sugarcane pulp for lyocell fiber, characterized in that: The system includes a high-concentration alkali treatment unit, a low-concentration alkali treatment unit, a chlorine dioxide bleaching unit, an alkali extraction unit, a hydrogen peroxide bleaching unit, an acid washing unit, and a dryer (34) connected in sequence via pipelines. The high-concentration alkali treatment unit includes a spray device (3), an alkali treatment device I (5) for holding high-concentration alkali solution, a slurry pump I (7), and a slurry washer I (9) connected in sequence via pipelines. The low-concentration alkali treatment unit includes a screw conveyor I (10), an alkali treatment device II (11) for holding low-concentration alkali solution, a slurry pump II (13), a desander (14), and a slurry washer II (15) connected in sequence via pipelines. The chlorine dioxide bleaching unit includes a spray device (3), an alkali treatment device I (5) for holding low-concentration alkali solution, a slurry pump II (13), a desander (14), and a slurry washer II (15) connected in sequence via pipelines. The spiral conveyor II (16), screw pump I (18), upflow bleaching tower I (19), downflow bleaching tower I (20), slurry pump III (21), and slurry washer III (22) are connected in sequence via pipelines; the alkali extraction unit includes an alkali extraction mixing tank (23), slurry pump IV (24), and slurry washer IV (25) connected in sequence via pipelines; the hydrogen peroxide bleaching unit includes a mixer (26), screw pump II (27), upflow bleaching tower II (28), downflow bleaching tower II (29), and slurry washer V (30) connected in sequence via pipelines; the acid washing unit includes an acid washing mixing tank (31), slurry pump V (32), and slurry washer VI (33) connected in sequence via pipelines.

2. The production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: Both the alkali treatment device I (5) and the alkali treatment device II (11) are equipped with a stirring mechanism, and both the alkali treatment device I (5) and the alkali treatment device II (11) are equipped with a built-in or external heating structure.

3. The production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: The alkali treatment device I (5) and alkali treatment device II (11) are steaming balls.

4. The production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: The front end of the spray device (3) is connected to a cyclone separator (2) and a blower (1) via pipelines.

5. A production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: A flow guide (4) is provided between the spray device (3) and the alkali treatment device I (5).

6. A production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: A double-disc grinding mill (8) is installed between the slurry pump I (7) and the slurry washer I (9).

7. A production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: Washing machine I (9), washing machine II (15), washing machine III (22), washing machine IV (25), washing machine V (30) and washing machine VI (33) are all double roller washing machines.

8. A production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: A pump riser (17) is provided between the screw conveyor II (16) and the screw pump I (18).

9. A production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: A slurry storage tank I (6) is provided between the alkali treatment device I (5) and the slurry pump I (7); a slurry storage tank II (12) is provided between the alkali treatment device II (11) and the slurry pump II (13).

10. A production system for producing sugarcane pulp for lyocell fiber according to claim 1, characterized in that: The screw conveyor I (10) is provided with inlet I (10.1) for adding water, alkali solution and hydrogen peroxide; the screw conveyor II (16) is provided with inlet II (16.1) for adding water, chlorine dioxide and hydrochloric acid; the alkali extraction mixing tank (23) is provided with inlet III (23.1) for adding water, alkali solution and hydrogen peroxide; the mixer (26) is provided with inlet IV (26.1) for adding water, hydrogen peroxide and alkali solution; and the pickling mixing tank (31) is provided with inlet V (31.1) for adding water, acid and complexing agent.

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