CN220514150U - Lyocell fiber waste solvent recovery system - Google Patents
Lyocell fiber waste solvent recovery system Download PDFInfo
- Publication number
- CN220514150U CN220514150U CN202322130095.6U CN202322130095U CN220514150U CN 220514150 U CN220514150 U CN 220514150U CN 202322130095 U CN202322130095 U CN 202322130095U CN 220514150 U CN220514150 U CN 220514150U
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- China
- Prior art keywords
- recovery system
- reaction tank
- lyocell fiber
- port
- solvent recovery
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- 238000011084 recovery Methods 0.000 title claims abstract description 56
- 229920000433 Lyocell Polymers 0.000 title claims abstract description 24
- 239000010887 waste solvent Substances 0.000 title claims description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 53
- 239000002699 waste material Substances 0.000 claims abstract description 48
- 238000003756 stirring Methods 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 abstract description 54
- 239000007788 liquid Substances 0.000 abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 31
- 239000008367 deionised water Substances 0.000 abstract description 29
- 229910021641 deionized water Inorganic materials 0.000 abstract description 29
- 238000003860 storage Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 14
- 239000011259 mixed solution Substances 0.000 description 14
- 239000002912 waste gas Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000013557 residual solvent Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- LFTLOKWAGJYHHR-UHFFFAOYSA-N N-methylmorpholine N-oxide Chemical compound CN1(=O)CCOCC1 LFTLOKWAGJYHHR-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000002166 wet spinning Methods 0.000 description 1
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model discloses a solvent recovery system for lyocell fiber waste, and relates to the technical field of lyocell fiber waste recovery. The utility model comprises a reaction tank, a dehydrator and a storage tank, wherein the reaction tank is provided with a discharge port, the dehydrator is provided with a liquid outlet, the discharge port of the reaction tank is communicated with the dehydrator, the liquid outlet of the dehydrator is provided with a recovery tank and a return pipe, the recovery pipe is communicated with the storage pipe, and the return pipe is communicated with the reaction tank. According to the utility model, part of mixed liquid separated by the dehydrator is input into the reaction tank through the return pipe, so that the mixed liquid can dissolve the solvent again, deionized water in the mixed liquid is reused, the consumption of the deionized water is reduced, and the recovery cost of the solvent is reduced.
Description
Technical Field
The utility model belongs to the technical field of lyocell fiber waste recovery, and particularly relates to a solvent recovery system for lyocell fiber waste.
Background
Solvent recovery plays a significant role in the Lyocell fibre preparation process. A stable and reliable solvent recovery technique is a basic guarantee for producing high quality Lyocell fibers. "Lyocell fiber core technology is dissolution, while industrialization success and failure is solvent recovery.
The solvent method cellulose fiber is prepared by mixing cellulose with NMMO solvent (N-methyl morpholine oxide), dissolving in a dissolving device to prepare cellulose slurry, conveying to a spinning machine, and dry-jet wet spinning. The solvent method is used for producing cellulose, part of cellulose slurry is required to be discharged in the processes of starting and stopping, and a large amount of solvent is contained in waste materials formed by the discharged cellulose slurry. The solvent in the waste materials is recycled necessarily, so that the production targets of saving production raw materials, reducing pollution and reducing production cost can be achieved.
However, the discharged cellulose pulp is solidified into solid at normal temperature and the solvent to be recovered, in the process of recovering the waste, the waste is crushed by a crushing device, the crushed waste is put into deionized water, and then the deionized water is heated by steam, so that the solvent in the waste is melted by heating and then is dissolved into the deionized water, and the solvent is separated from the waste, thereby achieving the purpose of separating the waste and the solvent. However, when heating is performed, compressed gas is usually introduced into the deionized water, and the introduced compressed gas is utilized to make the deionized water blow and boil, so that the solvent in the waste material is fully dissolved. After the waste material is separated from the solvent, a large amount of mixture of deionized water and the solvent is recycled to a container for containing the solvent, the consumption of the deionized water is large, and the recycling cost is high.
Disclosure of Invention
The utility model aims to provide a solvent recovery system for lyocell fiber waste, which is used for solving the problem of high solvent recovery cost.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model provides a lyocell fiber waste material solvent recovery system, includes retort, hydroextractor and holding tank, the retort is provided with the discharge port, the hydroextractor is provided with the leakage fluid dram, the discharge port of retort with the hydroextractor intercommunication, the leakage fluid dram of hydroextractor is provided with recovery pipe and back flow, the recovery pipe with the holding tank intercommunication, the back flow with the retort intercommunication.
In the scheme, the dehydrator partially enters the storage tank from the mixed solution separated from the waste and the liquid, and the partially enters the reaction tank to be used for dissolving the solvent again, so that deionized water in the reaction liquid can be reused, thereby reducing the consumption of the deionized water and reducing the cost of solvent recovery.
For further solving the problem that residual solvent exists on the waste material, the solvent recovery rate is low, for this reason, recovery system still includes the shower head, the shower head set up in the hydroextractor for spray the waste material in the hydroextractor.
In this scheme, the shower head can spray the washing to the waste material in the hydroextractor, makes the residual solvent break away from the waste material in the waste material, has improved the rate of recovery to the solvent. The solvent concentration of the mixed solution generated in the spraying process is low, and the mixed solution can be input into a reaction tank to dissolve the solvent again.
For further solving the problem that the flow direction of the mixed liquid discharged by the dehydrator is difficult to control, for this purpose, the recycling pipe and the return pipe are both provided with valves in the scheme.
In the scheme, the flow direction of the mixed liquid discharged by the dehydrator can be controlled by controlling the opening and closing of valves on the recovery pipe and the return pipe.
In order to further solve the problem of low dissolution efficiency in the waste, for this reason, in this scheme be provided with the (mixing) shaft in the retort.
In this scheme, the (mixing) shaft stirs waste material and deionized water in the retort, can accelerate the contact efficiency of waste material and deionized water, improves the dissolution efficiency of solvent. The stirring shaft is used for stirring, so that extra gas can be avoided, and a large amount of waste gas is prevented from polluting the environment.
In order to further solve the problem that the stirring effect of the stirring shaft in the reaction tank is uneven, the stirring shaft is provided with a plurality of blades, and the blades are arranged along the axial direction and/or the circumferential direction of the stirring shaft.
In this scheme, set up the blade in the circumference and the axial of (mixing) shaft, can make the stirring scope of (mixing) shaft enlarge, improve the stirring effect to waste material and deionized water in the retort.
For further solving the problem that there is exhaust emission in the solvent recovery process, for this reason, recovery system still includes sealed lid and gas pitcher, sealed lid with the retort is connected, sealed lid is used for sealing the retort, sealed lid is provided with the exhaust hole, the exhaust hole with the gas pitcher intercommunication.
In this scheme, sealed lid seals the retort for the gas that produces in the retort can only get into the gas pitcher through the exhaust hole, collects waste gas through the gas pitcher, thereby avoids waste gas diffusion to the environment in, avoids causing the pollution to the environment.
To further solve the problem of discontinuous solvent recovery, the recovery system further comprises a buffer tank, wherein the outlet of the reaction tank is connected with the buffer tank, the outlet of the buffer tank is communicated with the buffer tank, and the buffer tank is communicated with the dehydrator.
In this scheme, retort exhaust waste material and mixed solution temporarily store in the buffer tank for can in time discharge waste material and mixed solution in the retort, also can in time supply mixed solution, ensured that the retort can continuously carry out the solvent. The waste materials and the mixed liquid in the buffer tank can be continuously output to the dehydrator, so that the dehydrator can continuously and stably work, and the continuous solvent recovery is realized.
For further solving the problem that the content of the mixed solution in the reaction tank is difficult to control, the discharge outlet of the reaction tank comprises an overflow port and an emptying port, the height of the overflow port is higher than that of the emptying port, and the emptying port is arranged at the bottom of the reaction tank or at the bottom of the side wall of the reaction tank.
In the scheme, the emptying port is arranged to discharge the waste and the mixed liquid into the buffer tank at one time, and after the solvent in the waste is completely dissolved, the waste and the mixed liquid can be discharged into the buffer tank through the emptying port. The overflow port can control the liquid level in the reaction tank, thereby accurately controlling the liquid amount in the reaction tank.
In order to further solve the problem that the mixed liquid input by the return pipe is directly discharged from the overflow port, the overflow port and the emptying port are communicated with the buffer tank through pipelines, and valves are arranged on the pipelines connected with the overflow port and the emptying port.
In this scheme, when the back flow is with mixed liquid input retort, close the valve on the overflow mouth connecting tube, make the mixed liquid of back flow input fully mix in the retort after, open the valve on the overflow mouth connecting tube again to make the solvent concentration in the retort reduce, improve solvent dissolution efficiency, make the mixed liquid of back flow input obtain make full use of.
For further solving the problem that the inside of retort and buffer tank is inconvenient for observing, for this reason, retort and buffer tank all are provided with the window.
In this scheme, can observe inside retort and the buffer tank through the window, observe liquid level and waste material state.
The utility model has the following beneficial effects:
according to the utility model, part of mixed liquid separated by the dehydrator is input into the reaction tank through the return pipe, so that the mixed liquid can dissolve the solvent again, deionized water in the mixed liquid is reused, the consumption of the deionized water is reduced, and the recovery cost of the solvent is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a system configuration diagram of the present utility model.
In the drawings, the list of components represented by the various numbers is as follows:
1. a reaction tank; 2. a heating device; 3. a blade; 4. a stirring shaft; 5. sealing cover; 6. an air vent; 7. an overflow port; 8. a buffer tank; 9. a transfer pump; 10. a dehydrator; 11. a spray header; 12. a return pipe; 13. a recovery pipe; 14. a deionized water tank; 15. a storage tank; 16. a gas tank; 17. and a crushing device.
Detailed Description
The technical scheme of the utility model is clearly and completely described by a specific implementation mode of the embodiment of the utility model with the aid of the attached drawings.
In a first embodiment of the present utility model,
referring to fig. 1, the first embodiment provides a solvent recovery system for lyocell fiber waste, which comprises a crushing device 17, a reaction tank 1, a heating device 2, a dehydrator 10 and a storage tank 15, wherein an output end of the crushing device 17 is connected with the reaction tank 1, the heating device 2 is disposed in the reaction tank 1, the reaction tank 1 is provided with a discharge outlet, the discharge outlet is connected with the dehydrator 10 through a pipeline, a liquid outlet of the dehydrator 10 is provided with a recovery pipe 13 and a reflux pipe, the recovery pipe 13 is connected with the storage tank 15, and the reflux pipe is connected with the reaction tank 1. After the waste is dehydrated by the dehydrator 10, a mixed solution of solvent and deionized water is obtained. The mixed solution separated by the dehydrator 10 enters the storage tank 15 from the recovery pipe 13, and the rest mixed solution enters the reaction tank 1 from the return pipe to dissolve the solvent again, so that part of deionized water is reused, the utilization rate of the deionized water is improved, the consumption of the deionized water is reduced, and the aim of reducing the cost is fulfilled.
The recovery pipe 13 and the return pipe are both provided with valves, and the flow direction of the mixed liquid is controlled through the valves.
The recovery system further comprises a spray header 11 and a deionized water source, the spray header 11 is connected with the deionized water source through a pipeline, the spray header 11 is arranged in the dehydrator 10 and is used for spraying and flushing the dehydrated waste materials in the dehydrator 10 again, flushing the residual solvent on the waste materials, further recovering the solvent on the waste materials and improving the recovery rate of the solvent.
When the waste is dehydrated, the spray header 11 is in a state of stopping spraying, the valve on the recovery pipe 13 is in an open state, and the valve on the return pipe is in a closed state. At this time, the mixed liquid separated by the dehydrator 10 has a high solvent ratio, and the mixed liquid enters the storage tank 15 from the recovery pipe 13. After dehydration is completed, the valve on the recovery pipe 13 is closed, the spray header 11 starts spraying, and the valve on the return pipe is opened. The shower head 11 produces a mixed solution with a low solvent content when flushing waste material. This part of the solvent enters the reaction tank 1 from the return pipe, and the solvent is dissolved in the reaction tank 1, so that the deionized water for rinsing is reused. And because the solvent content in the mixed solution obtained by flushing is very low, the mixed solution cannot cause the solvent concentration in the reaction tank 1 to be too high after entering the reaction tank 1, and the dissolution of the solvent cannot be influenced. Therefore, the mixed solution obtained by flushing is input into the reaction tank 1 for reuse, so that the deionized water is reused, the utilization rate of the deionized water is improved, and the cost is reduced.
The stirring shaft 4 is arranged in the reaction tube, the stirring shaft 4 stirs the liquid in the reaction tank 1, and the dissolution efficiency of the solvent in the reaction tank 1 is improved.
The reaction tank 1 is provided with a driving motor, and the driving motor is in transmission connection with the stirring shaft 4 and is used for driving the stirring shaft 4 to rotate. For example, the output shaft of the drive motor is belt-driven or gear-driven with the stirring shaft 4.
The stirring shaft 4 is provided with a blade 3, and the length direction of the blade 3 is perpendicular to the axis of the stirring shaft 4. The stirring shaft 4 is provided with a plurality of blades 3 along the axial direction or the circumferential direction for improving the stirring effect.
The heating device 2 can adopt a steam distribution pipe, and the inside of the reaction tank 1 is heated by steam. Heating wires can be used to heat the interior of the reaction tank 1 by electric heating.
The output end of the crushing device 17 is provided with a screw conveyor, the screw conveyor is stable in feeding, and the quantity of waste materials fed into the reaction tank 1 can be estimated according to the working time of the screw conveyor, so that the purpose of controlling the quantity of the waste materials is achieved.
The reaction tank 1 is provided with a feeding hole, so that the screw conveyor can feed waste into the reaction tank 1.
The reaction tank 1 is provided with a liquid inlet hole, the liquid inlet hole is connected with a pipeline, and deionized water is conveyed into the reaction tube through the pipeline.
The recovery system is provided with a deionized water tank 14 for supplying deionized water to the shower head 11 and the reaction tube.
In a second embodiment of the present utility model,
the second embodiment provides a lyocell fiber waste solvent recovery system which, unlike the first embodiment, further includes a sealing cover 5 and a gas tank 16.
The sealed lid 5 with retort 1 is connected, sealed lid 5 is used for sealed retort 1, sealed lid 5 sets up the exhaust gas hole, the exhaust gas hole is connected with the waste gas pipeline, the waste gas pipeline end is connected with gas pitcher 16, gas pitcher 16 is used for collecting waste gas, avoids waste gas diffusion in retort 1 to the air in, avoids waste gas to cause the pollution to the environment.
In a third embodiment of the present utility model,
the third embodiment provides a solvent recovery system for lyocell fiber waste, which is different from the first embodiment. The recovery system further comprises a buffer tank 8 and a transfer pump 9.
The discharge outlet of the reaction tank 1 is connected with a buffer tank 8, the buffer tank 8 is also provided with a liquid outlet, the liquid outlet of the buffer tank 8 is connected with the water inlet end of a delivery pump 9, and the water outlet end of the delivery pump 9 is connected with a dehydrator 10.
The discharge port of the reaction tank 1 comprises an overflow port 7 and a vent port 6, wherein the vent port 6 is positioned at the bottom of the side wall of the reaction tank 1 or the bottom of the reaction tank 1, and the vent port 6 is used for completely venting the liquid and the waste materials in the reaction tank 1 after the solvent on the waste materials is completely dissolved. The height of the overflow port 7 is higher than that of the vent port 6, the overflow port 7 is used for limiting the liquid amount in the reaction tank 1, and when the liquid level is higher than that of the overflow port 7, the liquid is discharged from the overflow port 7. The overflow port 7 and the vent port 6 are connected with a buffer tank 8 through pipelines.
The overflow port 7 and the vent port 6 are connected with the buffer tank 8 through pipelines, and valves are arranged on the pipelines connected with the buffer tank 8 through the overflow port 7 and the vent port 6.
Both the reaction tank 1 and the buffer tank 8 are provided with windows for observing the internal conditions from the outside.
Claims (10)
1. A lyocell fiber waste solvent recovery system, characterized in that: including retort (1), hydroextractor (10) and holding tank (15), retort (1) is provided with the discharge port, hydroextractor (10) are provided with the leakage fluid dram, the discharge port of retort (1) with hydroextractor (10) intercommunication, the leakage fluid dram of hydroextractor (10) is provided with recovery tube (13) and back flow, recovery tube (13) with holding tank (15) intercommunication, the back flow with retort (1) intercommunication.
2. A lyocell fiber waste solvent recovery system according to claim 1, characterized in that: the waste material dewatering device further comprises a spray header (11), wherein the spray header (11) is arranged on the dewatering machine (10) and is used for spraying waste materials in the dewatering machine (10).
3. A lyocell fiber waste solvent recovery system according to claim 1, characterized in that: the recovery pipe (13) and the return pipe are both provided with valves.
4. A lyocell fiber waste solvent recovery system according to claim 1, characterized in that: a stirring shaft (4) is arranged in the reaction tank (1).
5. The lyocell fiber waste solvent recovery system of claim 4, wherein: the stirring shaft (4) is provided with a plurality of blades (3), and the blades (3) are arranged along the axial direction and/or the circumferential direction of the stirring shaft (4).
6. A lyocell fiber waste solvent recovery system according to claim 1, characterized in that: still include sealed lid (5) and gas pitcher (16), sealed lid (5) with retort (1) are connected, sealed lid (5) are used for sealing retort (1), sealed lid (5) are provided with the exhaust gas hole, the exhaust gas hole with gas pitcher (16) intercommunication.
7. A lyocell fiber waste solvent recovery system according to claim 1, characterized in that: the device further comprises a buffer tank (8), wherein the discharge outlet of the reaction tank (1) is connected with the buffer tank (8), the discharge outlet of the buffer tank (8) is communicated with the buffer tank (8), and the buffer tank (8) is communicated with the dehydrator (10).
8. The lyocell fiber waste solvent recovery system of claim 7, wherein: the exhaust port of the reaction tank (1) comprises an overflow port (7) and an emptying port (6), the height of the overflow port (7) is higher than that of the emptying port (6), and the emptying port (6) is arranged at the bottom of the reaction tank (1) or the emptying port (6) is arranged at the bottom of the side wall of the reaction tank (1).
9. The lyocell fiber waste solvent recovery system of claim 8, wherein: the overflow port (7) and the vent port (6) are communicated with the buffer tank (8) through pipelines, and valves are arranged on the pipelines connected with the overflow port (7) and the vent port (6).
10. The lyocell fiber waste solvent recovery system of claim 7, wherein: the reaction tank (1) and the buffer tank (8) are both provided with windows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322130095.6U CN220514150U (en) | 2023-08-08 | 2023-08-08 | Lyocell fiber waste solvent recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322130095.6U CN220514150U (en) | 2023-08-08 | 2023-08-08 | Lyocell fiber waste solvent recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220514150U true CN220514150U (en) | 2024-02-23 |
Family
ID=89924623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322130095.6U Active CN220514150U (en) | 2023-08-08 | 2023-08-08 | Lyocell fiber waste solvent recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220514150U (en) |
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2023
- 2023-08-08 CN CN202322130095.6U patent/CN220514150U/en active Active
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