Green fiber spinning device

Abstract

The utility model relates to the technical field of spinning equipment, in particular to a green fiber spinning device. The green fiber spinning device comprises a mixing and swelling tank, an MVR (mechanical vapor recompression) evaporator, a slurry-porridge mixer, a glue maker, a spinning device and a washing cutter which are connected in sequence, the mixing swelling tank is used for swelling the pulp and the 30-50% NMMO solution to obtain a cellulose turbid liquid; the MVR evaporator is used for evaporating and concentrating the cellulose turbid liquid to obtain a pulp-like diluted solution; and the slurry-porridge mixer is used for adjusting the content of cellulose, NMMO and water in the slurry-like diluted solution to obtain slurry-porridge liquid. On one hand, the proportion of cellulose, NMMO and water is controlled, on the other hand, waste heat steam generated in the glue making process of the glue making device is utilized through the MVR evaporation device, the use amount of new steam is reduced, supply and demand of equipment and steam in preparation, conveying and storage of a high-concentration NMMO solution are avoided, equipment investment is reduced, and energy consumption of green fiber spinning is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of spinning equipment, in particular to a spinning device for green fibers. Background Art

[0002] At present, in the green fiber industry, the board pulp or roll pulp or powdered cellulose, the excess water swelling and squeezing out the excess water, and the 76% or more NMMO solution are mixed into a porridge-like dilute solution, and placed in a cylindrical storage tank that acts as a buffer and stirred evenly to allow the cellulose to further swell fully, and then continuously fed into a screw pump or a thin film evaporator to vacuum remove excess water to evenly dissolve the cellulose to obtain a spinning solution, which is then filtered and sent to a spinning machine for spinning, drawing, washing, oiling, drying, curling, cutting, and packaging.

[0003] In the above process of preparing spinning solution, the cellulose content and cellulose moisture content in pulp and the concentration of NMMO solution affect the ratio of pulp porridge-like dilute solution and restrict the preparation of spinning solution; the recovery and concentration equipment of dilute NMMO solution in spinning coagulation bath and recovered by washing requires large investment and high energy consumption, which limits the development of green fiber industry. Utility Model Content

[0004] The utility model provides a spinning device for green fibers, which solves the problem that it is difficult to control the ratio of cellulose, NMMO and water in the slurry during the spinning process, and utilizes the waste heat steam generated in the process of glue making by a glue making device through an MVR evaporation device, thereby reducing the amount of new steam used, avoiding the equipment and steam supply and demand in the preparation, transportation and storage of high-concentration NMMO solutions, reducing equipment investment, and reducing the energy consumption of green fiber spinning.

[0005] A green fiber spinning device, comprising a mixing swelling tank, an MVR evaporator, a slurry mixer, a glue making device, a spinning device and a water washing cutter connected in sequence;

[0006] The mixed swelling tank is used to swell pulp with 30-50% NMMO solution to obtain cellulose suspension:

[0007] The MVR evaporator is used for evaporating and concentrating the cellulose suspension to obtain a porridge-like dilute solution;

[0008] The porridge mixer is used to adjust the contents of cellulose, NMMO and water in the porridge-like dilute solution to obtain porridge liquid;

[0009] The glue making device is used for making glue from porridge liquid to obtain glue making liquid;

[0010] The spinning device is used to spin the rubber solution to obtain fiber filaments;

[0011] The water washing cutter is used for water washing and cutting of fiber filaments.

[0012] In a specific embodiment of the present invention, the spinning device further comprises a solution mixer for preparing a 30-50% solution, and the outlet of the solution mixer is connected to the inlet of the mixing swelling tank.

[0013] In a specific embodiment of the present invention, the spinner is connected to a coagulation bath, and the coagulation bath and the solution mixer are provided with an NMMO solution recoverer.

[0014] In a specific embodiment of the present invention, the NMMO solution recoverer comprises a filter, an anion bed and a cation bed connected in sequence, the outlet of the coagulation bath is connected to the inlet of the filter, and the outlet of the cation bed is connected to the solution mixer.

[0015] In a specific embodiment of the present invention, the spinner is further connected to a first impurity remover, and an outlet of the first impurity remover is connected to the coagulation bath and / or the filter.

[0016] In a specific embodiment of the present utility model, the water-washing cutter is connected to a second impurity remover, and an outlet of the second impurity remover is connected to the filter.

[0017] In a specific implementation of the present utility model, the condensate outlet of the MVR evaporator is connected to the condensate collection tank, and the outlet of the condensate collection tank is connected to the water washing cut-off device.

[0018] In a specific embodiment of the present utility model, the outlet of the water-wash cut-off device is provided with a water scrubber, the condensate outlet of the MVR evaporator is connected to a condensate collection tank, and the outlet of the condensate collection tank is also connected to the water scrubber.

[0019] In a specific embodiment of the present invention, the outlet of the water scrubber is connected to the second impurity remover.

[0020] In a specific embodiment of the present utility model, the outlet of the waste heat steam generated during the glue making process of the glue making machine is connected to the MVR evaporator, and the condensed water outlet of the glue making machine is connected to the condensed water collection tank.

[0021] The beneficial effects of the utility model are as follows: on the one hand, the utility model controls the concentration of the NMMO solution, avoids the demand for high-concentration NMMO solution, and reduces the amount of steam used; on the other hand, the MVR evaporation device utilizes the waste heat steam generated in the glue making process of the glue making device, reduces the amount of new steam used, avoids the equipment and steam supply and demand in the preparation, transportation and storage of high-concentration NMMO solution, reduces equipment investment, and reduces the energy consumption of green fiber spinning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the spinning device of the green fiber of the utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Mixing and swelling tank; 2. MVR evaporator; 3. Porridge mixer; 4. Glue making machine; 5. Spinning machine; 6. Water washing and cutting machine; 7. Water washing machine; 8. Solution mixer; 9. Coagulation bath; 10. Filter; 11. Anion bed; 12. Cationic bed; 13. First impurity remover; 14. Second impurity remover; 15. Condensate collecting tank. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0026] A green fiber spinning device comprises a mixing swelling tank 1, an MVR evaporator 2, a slurry mixer 3, a glue making device 4, a spinning device 5 and a water washing cutter 6 which are connected in sequence;

[0027] The mixing swelling tank 1 is used for swelling the pulp with 30-50% NMMO solution to obtain a cellulose suspension. The mixing swelling tank 1 is also provided with a feeding port for feeding;

[0028] MVR evaporator 2 is used for evaporation and concentration of cellulose suspension to obtain a porridge-like dilute solution;

[0029] The porridge mixer 3 is used to adjust the contents of cellulose, NMMO and water in the porridge-like dilute solution to obtain porridge liquid;

[0030] The glue making device 4 is used for making glue from the porridge liquid to obtain glue making liquid;

[0031] The spinning device 5 is used for spinning the rubber solution to obtain fiber filaments;

[0032] The water-washing cutter 6 is used for washing and cutting the fiber filaments.

[0033] In some examples, the spinning device further includes a solution mixer 8 for preparing a 30-50% solution, the outlet of the solution mixer 8 is connected to the inlet of the mixing swelling tank 1; a 50% NMMO solution is added to the solution mixer 8, mixed with the recovered NMMO solution and prepared.

[0034] In some examples, the spinner 5 is connected to a coagulation bath 9 , and the coagulation bath 9 and the solution mixer 8 are provided with a NMMO solution recoverer.

[0035] In some examples, the NMMO solution recoverer includes a filter 10 , an anion bed 11 and a cation bed 12 connected in sequence, the outlet of the coagulation bath 9 is connected to the inlet of the filter 10 , and the outlet of the cation bed 12 is connected to the solution mixer 8 .

[0036] In some examples, the spinner 5 is further connected to a first impurity remover 13 , and an outlet of the first impurity remover 13 is connected to the coagulation bath 9 and / or the filter 10 .

[0037] In some examples, the water-wash cut-off device 6 is connected to a second impurity remover 14 , and an outlet of the second impurity remover 14 is connected to a filter 10 .

[0038] In some examples, the condensed water outlet of the MVR evaporator 2 is connected to a condensed water collection tank 15 .

[0039] In some examples, the outlet of the condensed water collection tank 15 is connected to the water wash cut-off device 6 .

[0040] In some examples, the outlet of the water-wash cut-off device 6 is provided with a water scrubber 7 , the condensate outlet of the MVR evaporator 2 is connected to a condensate collecting tank 15 , and the outlet of the condensate collecting tank 15 is also connected to the water scrubber 7 .

[0041] In some examples, the outlet of the water scrubber 7 is connected to the second impurity remover 14 .

[0042] In some examples, the MVR evaporator 2 also collects and utilizes the waste heat steam generated by the glue making machine 4 during the glue making process. The waste heat steam outlet of the glue making machine 4 is connected to the steam inlet of the MVR evaporator 2 ; the condensate outlet of the glue making machine 4 is connected to the condensate collection tank 15 .

[0043] The spinning device of the utility model is used to realize green fiber spinning, and comprises the following steps:

[0044] 1. The pulp contains 90-98% cellulose; the concentration of the NMMO solution is 30-50%; the pulp and the NMMO solution are directly mixed and crushed, and then swelled in a mixed swelling tank 1 to obtain a cellulose suspension;

[0045] 2. The pulp fiber suspension is evaporated and concentrated in the MVR evaporator 2 to remove excess water; wherein the evaporation and concentration temperature is 50-70°C, the viscosity of the pulp after evaporation and concentration is 1000-6000 PCS, the cellulose content is 30-40wt%, the water content is 20-25wt% and the NMMO content is 35-50wt%.

[0046] Then, the cellulose, NMMO and water contents are adjusted in the porridge mixer 3, and the spinning is performed after the glue is made in the glue making device 4;

[0047] 3. During the spinning process, a coagulation bath 9 is used to collect NMMO. When the NMMO concentration in the coagulation bath 9 is 16-25%, it is sequentially passed through a filter 10, an anion bed 11 and a cation bed 12, and finally sent to a solution mixer 8 to adjust the NMMO concentration to 30-50%, and then returned to step 1.

[0048] 4. The fiber filaments from the spinning device 5 are washed and cut by the water washing and cutting device 6, and then sent to the water washing device 7 for washing after cutting. The fiber filaments finally obtained are post-processed and packaged to obtain fiber filament products;

[0049] 5. The waste water in the spinning device 5 is sent to the first impurity remover 13 to filter out the waste silk produced by the spinning device 5. The waste silk is sent to the filter 10, and the filtered waste water is sent to the coagulation bath 9 to adjust the water level in the coagulation bath 9 and return the NMMO to the coagulation bath 9.

[0050] 6. The condensed water collected by the MVR evaporator 2 is sent to the water washing cutter 6 and the water washer 7 for water washing, and the waste liquid generated by the water washing is sent to the second impurity remover 14 to remove the waste silk, and the waste silk is also transported to the filter 10; and the washing waste water is returned to the water washing cutter 6 and the water washer 7 after impurities are removed to participate in water washing. Of course, the water washer 7 is also connected to a water supply pipeline to facilitate the washing of the fiber silk.

Claims

1. A green fiber spinning device, characterized in that: It comprises a mixing swelling tank (1), an MVR evaporator (2), a porridge mixer (3), a glue making device (4), a spinning device (5) and a water washing cutter (6) which are connected in sequence; The mixed swelling tank (1) is used for swelling pulp with 30-50% NMMO solution to obtain cellulose suspension: The MVR evaporator (2) is used to evaporate and concentrate the cellulose suspension to obtain a porridge-like dilute solution; The porridge mixer (3) is used to adjust the contents of cellulose, NMMO and water in the porridge-like dilute solution to obtain a porridge liquid; The glue making device (4) is used for making glue from the porridge liquid to obtain glue making liquid; The spinner (5) is used for spinning the glue solution to obtain fiber filaments; The water washing cutter (6) is used for water washing and cutting of fiber filaments.

2. The spinning device according to claim 1, characterized in that The spinning device further comprises a solution mixer (8) for preparing a 30-50% solution, and the outlet of the solution mixer (8) is connected to the inlet of the mixing swelling tank (1).

3. The spinning device according to claim 2, characterized in that The spinner (5) is connected to a coagulation bath (9), and the coagulation bath (9) and the solution mixer (8) are provided with an NMMO solution recovery device.

4. The spinning device according to claim 3, characterized in that The NMMO solution recovery device comprises a filter (10), an anion bed (11) and a cation bed (12) which are connected in sequence, the outlet of the coagulation bath (9) is connected to the inlet of the filter (10), and the outlet of the cation bed (12) is connected to the solution mixer (8).

5. The spinning device according to claim 4, characterized in that The spinner (5) is also connected to a first impurity remover (13), and the outlet of the first impurity remover (13) is connected to the coagulation bath (9) and / or the filter (10).

6. The spinning device according to claim 5, characterized in that The water-wash cutter (6) is connected to a second impurity remover (14), and an outlet of the second impurity remover (14) is connected to the filter (10).

7. The spinning device according to claim 6, characterized in that The condensate outlet of the MVR evaporator (2) is connected to a condensate collection tank (15), and the outlet of the condensate collection tank (15) is connected to the water washing cut-off device (6).

8. The spinning device according to claim 7, characterized in that The outlet of the water-wash cut-off device (6) is provided with a water washer (7), the condensate outlet of the MVR evaporator (2) is connected to a condensate collection tank (15), and the outlet of the condensate collection tank (15) is also connected to the water washer (7).

9. The spinning device according to claim 8, characterized in that The outlet of the water scrubber (7) is connected to the second impurity remover (14).

10. The spinning device according to claim 8, characterized in that The outlet of the waste heat steam generated by the glue making machine (4) during the glue making process is connected to the MVR evaporator (2), and the condensed water outlet of the glue making machine (4) is connected to the condensed water collection tank (15).

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