CN112725915B - Tow washing device and tow washing method - Google Patents
Tow washing device and tow washing method Download PDFInfo
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- CN112725915B CN112725915B CN202011565831.5A CN202011565831A CN112725915B CN 112725915 B CN112725915 B CN 112725915B CN 202011565831 A CN202011565831 A CN 202011565831A CN 112725915 B CN112725915 B CN 112725915B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/06—Washing or drying
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D13/00—Complete machines for producing artificial threads
- D01D13/02—Elements of machines in combination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Artificial Filaments (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention relates to a tow washing device and a tow washing method, wherein the tow washing device comprises: the device comprises a water washing unit, a filtering unit connected with the water washing unit, a coagulating bath circulating unit connected with the filtering unit and a mirabilite dissolving unit; the water washing unit is provided with a plurality of sections of water washing tanks which are sequentially connected along the tow washing direction, and each section of water washing tank is provided with a water inlet and a water outlet respectively; and the water outlet of the rinsing bath at the first section is connected with the inlet of the filtering unit along the strand washing direction. In the manufacturing process of the polyvinyl alcohol fiber, the tow washing effect is improved, the accumulation of microorganisms in a tow washing device is reduced, the sulfate content in the tow washing wastewater and the recycling cost of sewage treatment are reduced, and the consumption of mirabilite and demineralized water is reduced.
Description
Technical Field
The invention relates to the field of polyvinyl alcohol fiber preparation, in particular to a tow washing device and a tow washing method.
Background
During the preparation process of the polyvinyl alcohol fiber, microorganisms are easy to accumulate in the tow washing device, and the tow washing effect is influenced. The tow washing water adopts primary water to wash the tows, the content of sulfate in the tow washing wastewater is high, and the sewage treatment and recycling cost is high. The mirabilite carried by the tows is washed and discharged to a sewage system in the tow washing process, so that the mirabilite consumption is high.
Disclosure of Invention
The invention aims to provide a tow washing device and a tow washing method, and solves the problem of high consumption in the tow washing process.
To achieve the above object, the present invention provides a tow washing device comprising: the device comprises a water washing unit, a filtering unit connected with the water washing unit, a coagulating bath circulating unit connected with the filtering unit and a mirabilite dissolving unit;
the water washing unit is provided with a plurality of sections of water washing tanks which are sequentially connected along the tow washing direction, and each section of water washing tank is provided with a water inlet and a water outlet respectively;
and the water outlet of the rinsing bath at the first section is connected with the inlet of the filtering unit along the strand washing direction.
According to one aspect of the invention, the filter unit comprises a plurality of filters, and the plurality of filters are arranged in parallel.
According to an aspect of the present invention, the coagulation bath circulation unit includes: a coagulation bath circulating tank and a coagulation bath circulating pump;
the coagulating bath circulating tank is connected with an outlet of the filtering unit;
and the inlet of the coagulating bath circulating pump is connected with the coagulating bath circulating tank and is used for outputting the liquid at the bottom of the coagulating bath circulating tank.
According to one aspect of the present invention, the mirabilite dissolving unit is connected to an outlet of the filtering unit.
According to an aspect of the invention, further comprising: the system comprises a six-effect evaporator, a condensate water collecting tank, a mixed condenser and a buffer tank;
the outlet of the coagulating bath circulating pump is communicated with the inlet of the tower top of the six-effect evaporator through a pipeline;
the first tower top outlet of the six-effect evaporator is communicated with the coagulating bath circulating tank through a pipeline;
the second tower top outlet of the six-effect evaporator is communicated with the first tower top inlet of the mixing condenser;
the tower kettle outlet of the six-effect evaporator is communicated with the condensed water collecting tank through a pipeline;
and the tower kettle outlet of the mixing condenser is communicated with the buffer tank through a pipeline.
According to an aspect of the invention, further comprising: a coagulating bath water-saving tank and a first centrifugal pump set;
the coagulation bath water-saving tank is communicated with the condensed water collecting tank and is used for collecting liquid overflowing from the condensed water collecting tank;
and the first centrifugal pump set is respectively communicated with the coagulating bath water-saving tank and the buffer tank and is used for feeding liquid in the coagulating bath water-saving tank into the buffer tank.
According to one aspect of the invention, a first branch pipe is arranged on a pipeline of the first centrifugal pump group communicated with the buffer tank, and the first branch pipe is connected with a mechanical seal water pipeline of the first centrifugal pump group.
According to an aspect of the invention, further comprising: a second centrifugal pump group;
and the second centrifugal pump group is respectively communicated with the buffer tank and the water inlet of the second section of the rinsing tank.
According to one aspect of the invention, a second inlet at the top of the mixing condenser is optionally communicated with an external water pipe or communicated with a water outlet of the second section of the rinsing bath through a water treatment system;
the water inlet of the first section of the rinsing bath is communicated with an external demineralized water pipe.
According to one aspect of the invention, guide rods for fixing the silk bundles are arranged in each section of the rinsing bath at intervals;
the guide rod is a glass guide rod.
According to one aspect of the invention, the water outlet of each section of the rinsing bath is also connected with a sewage discharge pipe respectively.
To achieve the above object, the present invention provides a tow washing method comprising the steps of:
s1, introducing desalted water into a washing tank at a first section in a washing unit along the strand washing direction, and introducing primary water into the rest washing tanks;
and S2, introducing water output from the first-stage rinsing bath into a coagulating bath circulation unit and/or a mirabilite dissolving unit, delivering the rest of liquid output from the rinsing bath to a water treatment system, and after the water treatment is qualified, introducing the liquid into a primary water system for condensation of a mixing condenser.
According to an aspect of the present invention, in step S2, if the water output from the first stage water washing tank passes through the filtering unit and then is introduced into the coagulation bath circulating unit, the output water passes through the coagulation bath circulating tank and then is input into the six-effect evaporator, and is subjected to evaporation and concentration treatment in the six-effect evaporator and then is sent to the coagulation bath circulating tank.
According to an aspect of the present invention, in step S2, the vapor generated by evaporation in the six-effect evaporator is sent to the mixing condenser through a pipeline to be mixed with the liquid of the mixing condenser input from the second inlet in a gas-liquid manner, and the tower bottoms generated after mixing is sent to the buffer tank.
According to one aspect of the invention, in step S2, the tower bottoms in the six-effect evaporator are sent to a condensate water collecting tank, and when the liquid level reaches a preset height, the liquid level overflows to a coagulation bath water saving tank through a pipeline;
and the first centrifugal pump group connected with the coagulation bath water-saving tank sends one part of liquid in the coagulation bath water-saving tank to the buffer tank through a pipeline, and sends the other part of liquid to a mechanical seal water pipeline of the first centrifugal pump group through a first branch pipe, and the mechanical seal water pipeline is used for cooling the first centrifugal pump group and then reflowing to the condensed water collecting tank.
According to an aspect of the present invention, in step S2, a second centrifugal pump group sends the constant temperature liquid stored in the buffer tank to a water inlet of the washing tank.
According to one aspect of the invention, if the liquid output from the washing tank of the first section is introduced into the mirabilite dissolving unit, the output liquid is mixed with mirabilite in the mirabilite dissolving unit and then output to the coagulating bath circulating tank.
According to one aspect of the invention, the temperature of the desalted water introduced into the rinsing bath in the first stage is 42 +/-3 ℃;
the temperature of the primary water introduced into the rinsing bath at the second stage is 42 +/-3 ℃.
According to the invention, the higher the temperature setting of the desalted water and the primary water of the rinsing bath is, the higher the energy consumption is, the lower the temperature is, the lower the tow washing effect is reduced, according to the summary of production experience, the water temperature is set to 42 +/-3 ℃, the tow washing requirement can be met, meanwhile, the energy consumption of the rinsing is optimal, and the optimal balance of the washing and the energy consumption is achieved.
According to the scheme of the invention, in the manufacturing process of the polyvinyl alcohol fiber, the tow washing effect is improved, the accumulation of microorganisms in a tow washing device is reduced, the sulfate content in the tow washing wastewater and the recycling cost of sewage treatment are reduced, and the consumption of mirabilite and desalted water is reduced.
According to one scheme of the invention, the water washing unit is modified and divided into a multi-section water washing tank structure, so that tows can be washed by adopting different water respectively, and the method is extremely favorable for improving the tow washing effect and reducing the accumulation of microorganisms in the tow washing device. In addition, because first section wash bowl is the prewashing, recycles after carrying a large amount of glauber's salt on the silk bundle and prewashing, the second section wash bowl washing silk bundle, the glauber's salt that carries on the silk bundle reduces to the glauber's salt content of discharging into water treatment system aquatic reduces, has realized reducing the content of sulphate in the washing drainage in other wash bowls except first section wash bowl, and further to reducing and handle sewage retrieval and utilization cost profitable.
According to one scheme of the invention, the water output from the first-stage rinsing tank is filtered and purified by the filtering unit consisting of a plurality of filters arranged in parallel and then is input into the subsequent coagulation bath circulating unit, so that the purity of the water entering the coagulation bath circulating unit is ensured, and the long-time stable operation of the coagulation bath circulating unit is ensured. In addition, a plurality of filters are arranged in the filtering unit in parallel, so that the filtering efficiency of the invention is effectively improved, the filtering unit can be effectively ensured to stably run for a long time, and the defect of shutdown of the whole system caused by blockage due to small quantity of the filters is avoided.
According to one scheme of the invention, the discharged water in the first-stage rinsing bath is recycled by the coagulating bath circulating unit, so that the mirabilite in the first-stage rinsing bath is effectively recycled, and the mirabilite consumption in the tow production process is reduced. Meanwhile, the discharged water is selectively added into the mirabilite dissolving unit to be used for dissolving the mirabilite, so that the water after the mirabilite is dissolved can be directly applied to the production process of the tows, the utilization rate of the discharged water is improved, the treatment process of the discharged water is simplified, and the production process of the whole tows is simplified. Through the arrangement, the demineralized water can be saved by about 0.15 ton/ton of polyvinyl alcohol fiber, and the mirabilite can be saved by about 0.0084 ton/ton of polyvinyl alcohol fiber.
Drawings
FIG. 1 schematically shows a configuration of a tow washing device according to one embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in fig. 1, according to one embodiment of the invention, a tow washing device of the invention comprises: a water washing unit 11, a filtering unit 12 connected with the water washing unit 11, a coagulating bath circulating unit 13 connected with the filtering unit 12 and a mirabilite dissolving unit 14. In the present embodiment, the water washing unit 11 is provided with a plurality of stages of sequentially connected water washing tanks 111a, 111b in the tow washing direction, and each water washing tank 111a, 111b is provided with a water inlet 1111a, 1111b and a water outlet 1112a, 1112b, respectively. In the present embodiment, the water outlet 1112a of the rinsing bath 111a at the first stage is connected to the filter unit 12 in the tow washing direction. In the present embodiment, the rinsing tanks 111a, 111b have two stages, and it may be provided in more stages, while the structures of the rinsing tanks in the other stages are identical to those of the rinsing tank in the second stage.
According to the invention, the water washing unit 11 is modified and divided into a multi-section washing tank structure, so that tows can be washed by adopting different water respectively, and the method is extremely beneficial to improving the tow washing effect and reducing the accumulation of microorganisms in a tow washing device. In addition, the content of sulfate in washing wastewater in other sections of washing tanks except the first section of washing tank is also reduced (namely, because the first section of washing tank is prewashed, a large amount of mirabilite carried on the tows is prewashed and then recycled, the second section of washing tank washes the tows, and the mirabilite carried on the tows is reduced, so that the content of the mirabilite in water discharged into a water treatment system is reduced), and the reduction of the recycling cost of the treated sewage is further facilitated.
As shown in fig. 1, according to an embodiment of the present invention, the filter unit 12 includes a plurality of filters 121, and the plurality of filters 121 are arranged in parallel with each other. In the present embodiment, the filter unit 12 includes two filters 121 arranged in parallel.
Through the arrangement, the water output by the first-stage rinsing bath is filtered and purified by the filtering unit consisting of the filters 121 arranged in parallel and then is input into the subsequent coagulation bath circulating unit 13, so that the purity of the water entering the coagulation bath circulating unit is ensured, and the long-time stable operation of the coagulation bath circulating unit is ensured. In addition, a plurality of filters are arranged in the filtering unit in parallel, so that the filtering efficiency of the invention is effectively improved, the filtering unit can be effectively ensured to stably run for a long time, and the defect of shutdown of the whole system caused by blockage due to small quantity of the filters is avoided.
As shown in fig. 1, according to one embodiment of the present invention, the coagulation bath circulating unit 13 includes: a coagulation bath circulation tank 131 and a coagulation bath circulation pump 132. In the present embodiment, the coagulation bath circulation tank 131 is connected to the outlet of the filtration unit 12; an inlet of the coagulation bath circulation pump 132 is connected to the coagulation bath circulation tank 131 for outputting the liquid at the bottom of the coagulation bath circulation tank 131. In this embodiment, the coagulation bath circulation tank 131 functions as a water seal vacuum to ensure smooth liquid flow in this embodiment. In the present embodiment, a plurality of coagulation bath circulation pumps 132 (e.g., two or three) are provided in parallel. Through setting up coagulating bath circulating pump 132 to many, can realize its exclusive use or combined use for its work efficiency and efficiency are higher, still are favorable to avoiding single pump to appear damaging and lead to the risk that entire system device shut down simultaneously, make the device in this scheme can long-term steady operation.
As shown in fig. 1, a salt cake dissolving unit 14 is connected to an outlet of the filtering unit 12 according to an embodiment of the present invention. In the present embodiment, the mirabilite dissolving unit 14 is connected to the outlet of the filtering unit 12 in communication with the coagulation bath circulating unit 13, and control valves are respectively disposed on the connection pipelines of the mirabilite dissolving unit 14 and the coagulation bath circulating unit 13, so that the liquid output from the filtering unit 12 can selectively flow into the mirabilite dissolving unit 14 and/or the coagulation bath circulating unit 13. In the present embodiment, when the liquid discharged from the filter unit 12 is introduced into the mirabilite dissolving unit 14, the liquid in the mirabilite dissolving unit 14 is transferred to the coagulation bath circulation tank 131 after the mirabilite is dissolved.
As shown in fig. 1, according to one embodiment of the invention, the tow washing device of the invention further comprises: a six-effect evaporator 15, a condensate water collecting tank 16, a mixing condenser 17 and a buffer tank 18. In the present embodiment, the outlet of the coagulation bath circulation pump 132 is communicated with the top inlet of the six-effect evaporator 15 through a pipe. With the above arrangement, the coagulation bath circulation pump 132 directly sends the liquid in the coagulation bath circulation tank 131 to the six-effect evaporator 15. In the present embodiment, the first top outlet of the six-effect evaporator 15 is connected to the coagulation bath circulation tank 131 through a line. Through the above arrangement, the liquid containing mirabilite after the concentration of the six-effect evaporator 15 returns to the coagulation bath circulation tank 131, so that the stability of the concentration of the mirabilite in the coagulation bath circulation tank 131 is ensured, the defect of insufficient concentration of the mirabilite is overcome, and the reuse rate of the mirabilite is high. In the present embodiment, the second overhead outlet of the six-effect evaporator 15 communicates with the overhead first inlet of the hybrid condenser 17; through the arrangement, steam generated in the six-effect evaporator 15 can be directly introduced into the mixing condenser 17, energy carried in the steam generated in the six-effect evaporator 15 is recovered, and therefore the efficiency of energy recovery in the scheme is higher, and energy is saved. In the embodiment, the tower kettle outlet of the six-effect evaporator 15 is communicated with the condensate collecting tank 16 through a pipeline, wherein the condensate collecting tank 16 also plays a role in water sealing and vacuum, and the normal and stable operation of the whole system is ensured. In the present embodiment, the column outlet of the mixing condenser 17 communicates with the buffer tank 18 through a line. Steam output by the six-effect evaporator 15 is condensed in the mixing condenser 17 and then recovered to form constant-temperature hot liquid, and then the constant-temperature hot liquid is conveyed to the buffer tank 18 for buffering, so that stable liquid supply for subsequent processes can be kept, and the constant-temperature hot liquid feeding device is beneficial to ensuring normal stable operation of the scheme. In the present embodiment, the buffer tank corresponds to a buffer tank for water supplied from the rinsing tank, and the temperature and pressure of water supplied to the rinsing tank are kept constant.
According to the invention, the bath liquid in the coagulation bath circulating tank 131 is evaporated and concentrated by adopting the six-effect evaporator 15, so that the concentration of the bath liquid in the coagulation bath circulating tank 131 is ensured to be within the process requirement range, and the condensed water generated by the evaporator is recycled.
As shown in fig. 1, according to one embodiment of the invention, the tow washing device of the invention further comprises: a coagulation bath water-saving tank 19 and a first centrifugal pump group 20. In this embodiment, a coagulation bath water saving tank 19 communicates with the condensate collection tank 16 for collecting liquid overflowing from the condensate collection tank 16. In the present embodiment, the first centrifugal pump group 20 communicates with the coagulation bath water-saving tank 19 and the buffer tank 18, respectively, and feeds the liquid in the coagulation bath water-saving tank 19 to the buffer tank 18. In this embodiment, the first centrifugal pump group 20 is also composed of a plurality of centrifugal pumps (e.g., two, three or more centrifugal pumps), so that single operation or combined operation of the centrifugal pumps in the pump unit can be realized, and flexible and stable operation of the whole system can be realized.
As shown in fig. 1, according to an embodiment of the present invention, a first branch pipe 201 is provided on a pipeline of the first centrifugal pump group 20 communicating with the buffer tank 18, and the first branch pipe 201 is connected with a mechanical seal water pipeline of the first centrifugal pump group 20. The liquid of exporting through first branch pipe 201 can be used to cool off first centrifugal pump group 20, then flow back to condensate water collecting tank 16 in, has not only realized the cooling to first centrifugal pump group 20, has still retrieved the produced heat of first centrifugal pump group 20, very big improvement the resource utilization of this scheme.
As shown in fig. 1, according to one embodiment of the invention, the tow washing device of the invention further comprises: a second centrifugal pump group 21. In the present embodiment, the second centrifugal pump group 21 is communicated with the buffer tank 18 and the water inlet 1111b of the second stage washing tank 111b, respectively. In this embodiment, the centrifugal pumps in the second centrifugal pump group 21 are provided with a plurality of centrifugal pumps (e.g., two, three or more centrifugal pumps), and the centrifugal pumps in the second centrifugal pump group can be operated individually or in combination, so that flexibility and stability in the operation process are realized, and the scheme is beneficial to ensuring the overall stability.
Through the arrangement, the liquid in the water washing unit 11 is recycled, and the resource utilization rate of the whole device is effectively improved.
As shown in FIG. 1, according to an embodiment of the present invention, the second inlet 17a at the top of the mixing condenser 17 is optionally communicated with an external water pipe or communicated with the water outlet 1112b of the second-stage rinsing bath 111b through a water treatment system. Through the arrangement, the liquid in the rinsing bath 111b is recycled, the liquid and the steam output by the six-effect evaporator are subjected to gas-liquid mixing, the steam is recycled, the heat in the steam is also recycled, and the resource utilization efficiency of the scheme is effectively improved. Of course, when water needs to be supplemented into the system, the water can be connected through an external water pipe, so that the water circulation in the whole system is in a stable state.
In this embodiment, the water inlet 1111a of the first-stage rinsing bath 111a is connected to an external demineralized water pipe.
According to an embodiment of the present invention, the water outlets 1112a, 1112b of each of the washing tanks 111a, 111b are further connected to a sewage drain respectively. Through the arrangement, when the liquid in the rinsing bath is circulated too much and cannot be reused, the whole system can be supplemented with new liquid through the drain pipe, so that the overall quality of washing the silk bundles is achieved.
According to one embodiment of the present invention, the length ratio of the rinsing bath 111a of the first stage to the rinsing bath 111b of the second stage is 1: 10. Researches show that through the arrangement, the quality of the tow washing is guaranteed, especially, the second section of the rinsing bath is lengthened, so that the washing efficiency of the scheme can be effectively improved, the washing time is saved, the washing processes of the front section of the rinsing bath and the back section of the rinsing bath are kept synchronous, the consumption of demineralized water is reduced, and the production cost is finally reduced.
In the water washing unit 11, guide rods for fixing the tows are arranged at intervals in each of the washing tanks 111a, 111 b. In the present embodiment, the guide is a glass guide. In the embodiment, in the process of washing the tows, the tows are easy to float or gather in water, and then the tows are pressed up and down through the guide rod, so that the flow rate of water in the washing tank is controlled, and the washing effect is better achieved. In the embodiment, the tows penetrate between the two glass guide rods, and the distance between the two glass guide rods is 10-20cm, so that the passing mode of the tows is limited, the liquid squeezing function is achieved, and mirabilite solution carried in the tows is squeezed and recycled.
The guide rods are arranged between the adjacent rinsing tanks, so that tows can be smoothly sent into the downstream rinsing tanks from the upstream rinsing tanks, conveying obstacles generated by the split upstream and downstream rinsing tanks are effectively eliminated, and the conveying efficiency of the tows is also ensured.
According to one embodiment of the invention, the tow washing method of the invention comprises the steps of:
s1, along the strand washing direction, introducing demineralized water into a washing tank 111a in the first section in a washing unit 11, and introducing primary water into the rest washing tanks 111 b; it should be noted that the water introduced into the mixing condenser 17 is primary water, and the water introduced into the remaining rinsing bath 111b is water mixed and condensed by the mixing condenser 17, and may be referred to as primary water. "Primary water" refers to non-recycled water that is treated to make it industrially useful.
S2, introducing the water output from the first-stage rinsing tank 111a into the coagulating bath circulating unit 13 and/or the mirabilite dissolving unit 14, delivering the output liquid from the rest rinsing tanks 111b to a water treatment system, and entering a primary water system after water treatment is qualified for condensation by the mixing condenser 17.
As shown in fig. 1, according to an embodiment of the present invention, in step S2, when the water discharged from the first-stage rinsing bath 111a passes through the filtering unit 12 and then is introduced into the coagulation bath circulating unit 13, the discharged water passes through the coagulation bath circulating tank 131 and then is introduced into the six-effect evaporator 15, and is evaporated and concentrated in the six-effect evaporator 15 and then is sent to the coagulation bath circulating tank 131.
As shown in fig. 1, according to one embodiment of the present invention, in step S2, the vapor generated by evaporation in the six-effect evaporator 15 is sent to the mixing condenser 17 through a pipeline to be mixed with the liquid fed to the mixing condenser 17 from the second inlet 17a in a gas-liquid manner, and the bottom liquid generated after mixing is sent to the buffer tank 18. In the present embodiment, the buffer tank corresponds to a buffer tank for water supplied from the rinsing tank, and the temperature and pressure of water supplied to the rinsing tank are kept constant.
As shown in fig. 1, according to an embodiment of the present invention, in step S2, the tower bottoms in the six-effect evaporator 15 are sent to a condensate collecting tank 16, and when the liquid level reaches a predetermined height, the liquid level overflows to a coagulation bath water saving tank 19 through a pipeline; in the present embodiment, the first centrifugal pump group 20 connected to the coagulation bath water saving tank 19 feeds a part of the liquid in the coagulation bath water saving tank 19 to the buffer tank 18 through a pipeline, and feeds the other part of the liquid to the mechanical seal water pipeline of the first centrifugal pump group 20 through the first branch pipe 201, so as to cool the first centrifugal pump group 20 and return the cooled liquid to the condensate water collecting tank 16.
As shown in fig. 1, according to an embodiment of the present invention, in step S2, a second centrifugal pump group sends the constant temperature liquid stored in the buffer tank 18 to the water inlet 1111b of the washing tank 111 b.
As shown in fig. 1, according to an embodiment of the present invention, if the liquid discharged from the first stage washing tank 111a is introduced into the mirabilite dissolving unit 14, the discharged liquid is mixed with the mirabilite in the mirabilite dissolving unit 14 and then discharged to the coagulation bath circulation tank 131, where the discharged liquid, which is actually the water after the pre-washing of the filament bundle, washes away a large amount of mirabilite carried on the filament bundle, and the mirabilite is dissolved by the pre-washing and then enters the coagulation bath circulation tank for correction.
As shown in fig. 1, according to an embodiment of the present invention, the temperature of the demineralized water introduced into the first-stage rinsing bath 111a is 42 ± 3 ℃;
the temperature of the primary water fed into the second-stage washing tank 111b was 42. + -. 3 ℃.
According to the invention, the washing units are arranged in sections, so that different water is introduced into the washing tanks at different sections for washing the tows, and the water consumption of different water qualities can be effectively saved. Especially, the dosage of the desalted water is effectively reduced, thereby being beneficial to saving cost.
According to the invention, the discharged water in the first-stage rinsing bath is recycled by the coagulating bath circulating unit 13, so that the mirabilite in the water is effectively recycled, and the consumption of the mirabilite in the production process of the tows is reduced. Meanwhile, the drained water is selectively added into the mirabilite dissolving unit to be used for dissolving the mirabilite, so that the water after the mirabilite is dissolved can be directly applied to the production process of the tows, the utilization rate of the drained water is improved, the treatment process of the drained water is simplified, the mirabilite in the drained water is recycled, and the production process of the whole tows is simplified. Through the arrangement, the demineralized water can be saved by about 0.15 ton/ton of polyvinyl alcohol fiber, and the mirabilite can be saved by about 0.0084 ton/ton of polyvinyl alcohol fiber.
The foregoing is merely exemplary of particular aspects of the present invention and devices and structures not specifically described herein are understood to be those of ordinary skill in the art and are intended to be implemented in such conventional ways.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A tow washing device, comprising: the device comprises a water washing unit (11), a filtering unit (12) connected with the water washing unit (11), a coagulating bath circulating unit (13) and a mirabilite dissolving unit (14) connected with the filtering unit (12);
the water washing unit (11) is provided with a plurality of sections of water washing tanks (111a, 111b) which are sequentially connected along the strand washing direction, and each section of water washing tank (111a, 111b) is respectively provided with a water inlet (1111a, 1111b) and a water outlet (1112a, 1112 b);
the water outlet (1112a) of the water washing tank (111a) at the first section is connected with the inlet of the filter unit (12) along the tow washing direction;
the mirabilite dissolving unit (14) is connected with the outlet of the filtering unit (12);
the filtering unit (12) comprises a plurality of filters (121), and the plurality of filters (121) are arranged in parallel;
the coagulation bath circulation unit (13) includes: a coagulation bath circulation tank (131), a coagulation bath circulation pump (132);
the coagulation bath circulating tank (131) is connected with an outlet of the filtering unit (12);
the inlet of the coagulation bath circulating pump (132) is connected with the coagulation bath circulating tank (131) and is used for outputting liquid at the bottom of the coagulation bath circulating tank (131);
the device further comprises: a six-effect evaporator (15), a condensate water collecting tank (16), a mixing condenser (17) and a buffer tank (18);
the outlet of the coagulating bath circulating pump (132) is communicated with the top inlet of the six-effect evaporator (15) through a pipeline;
the first tower top outlet of the six-effect evaporator (15) is communicated with the coagulating bath circulating tank (131) through a pipeline;
a second tower top outlet of the six-effect evaporator (15) is communicated with a first tower top inlet of the hybrid condenser (17);
the tower kettle outlet of the six-effect evaporator (15) is communicated with the condensed water collecting tank (16) through a pipeline;
the tower bottom outlet of the mixing condenser (17) is communicated with the buffer tank (18) through a pipeline.
2. The tow washing device of claim 1, further comprising: a coagulation bath water-saving tank (19) and a first centrifugal pump set (20);
the coagulation bath water-saving tank (19) is communicated with the condensed water collecting tank (16) and is used for collecting liquid overflowing from the condensed water collecting tank (16);
the first centrifugal pump set (20) is respectively communicated with the coagulation bath water-saving tank (19) and the buffer tank (18) and is used for feeding liquid in the coagulation bath water-saving tank (19) into the buffer tank (18).
3. The tow washing device according to claim 2, wherein a first branch pipe (201) is provided on a line where the first centrifugal pump group (20) communicates with the buffer tank (18), and the first branch pipe (201) is connected with a mechanical seal water line of the first centrifugal pump group (20).
4. The tow washing device of claim 3, further comprising: a second centrifugal pump group (21);
the second centrifugal pump group (21) is respectively communicated with the buffer tank (18) and the water inlet (1111b) of the second section of the rinsing tank (111 b).
5. The tow washing device according to claim 4, wherein the second inlet (17a) at the top of the mixing condenser (17) is optionally communicated with an external water pipe or communicated with the water outlet (1112b) of the second section of the washing tank (111b) through a water treatment system;
the water inlet (1111a) of the rinsing tank (111a) in the first section is communicated with an external demineralized water pipe.
6. The tow washing device according to claim 1 or 5, wherein guide rods for fixing the tows are arranged in the washing tanks (111a, 111b) at intervals;
the guide rod is a glass guide rod.
7. The tow washing device according to claim 6, wherein a drain pipe is further connected to the water outlet (1112a, 1112b) of each water washing tank (111a, 111 b).
8. A tow washing method employing the tow washing device of any one of claims 1 to 7, comprising the steps of:
s1, along the strand washing direction, introducing desalted water into a washing tank (111a) in the first section of a washing unit (11), and introducing primary water into the rest of washing tanks (111 b);
s2, introducing water output from the first section of the rinsing tank (111a) into a coagulating bath circulating unit (13) and/or a mirabilite dissolving unit (14), delivering the rest of liquid output from the rinsing tank (111b) to a water treatment system, and entering a primary water system after the water treatment is qualified for condensation by a mixing condenser (17);
in the step S2, if the water output from the first-stage rinsing bath (111a) passes through the filtering unit (12) and then is introduced into the coagulation bath circulating unit (13), the output water passes through the coagulation bath circulating tank (131) and then is input into the six-effect evaporator (15), and is evaporated and concentrated in the six-effect evaporator (15) and then is sent to the coagulation bath circulating tank (131);
if the liquid output from the first section of the rinsing tank (111a) is introduced into the mirabilite dissolving unit (14), the output liquid is mixed with the mirabilite in the mirabilite dissolving unit (14) and then output to the coagulating bath circulating tank (131).
9. The tow washing method according to claim 8, wherein in step S2, steam generated by evaporation in the six-effect evaporator (15) is sent to the mixing condenser (17) through a pipeline to be mixed with liquid input into the mixing condenser (17) from the second inlet (17a) in a gas-liquid manner, and tower bottoms generated after mixing are sent to the buffer tank (18).
10. The tow washing method according to claim 9, wherein in step S2, tower bottoms in the six-effect evaporator (15) are sent to a condensate collection tank (16), and overflow to a coagulation bath water saving tank (19) through a pipeline when the liquid level reaches a preset height;
and a first centrifugal pump set (20) connected with the coagulation bath water-saving tank (19) sends one part of liquid in the coagulation bath water-saving tank (19) to a buffer tank (18) through a pipeline, and sends the other part of liquid to a mechanical seal water pipeline of the first centrifugal pump set (20) through a first branch pipe (201), and the liquid is used for cooling the first centrifugal pump set (20) and then reflowing to a condensed water collecting tank (16).
11. The tow washing method according to claim 10, wherein in step S2, a second centrifugal pump group sends the constant temperature liquid stored in the buffer tank (18) to the water inlet (1111b) of the water washing tank (111 b).
12. A tow washing method according to any one of claims 8 to 11, wherein the temperature of the demineralized water fed into the first stage of the washing tank (111a) is 42 ± 3 ℃;
the temperature of the primary water introduced into the washing tank (111b) of the second stage is 42 +/-3 ℃.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211074189.XA CN115233326A (en) | 2020-12-25 | 2020-12-25 | Tow washing method and device |
| CN202211073961.6A CN115323516A (en) | 2020-12-25 | 2020-12-25 | Six-effect evaporation, condensation and recovery device and method for fiber tow washing water |
| CN202211073968.8A CN115262040A (en) | 2020-12-25 | 2020-12-25 | Polyvinyl alcohol fiber strand mirabilite online recovery device and method |
| CN202011565831.5A CN112725915B (en) | 2020-12-25 | 2020-12-25 | Tow washing device and tow washing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565831.5A CN112725915B (en) | 2020-12-25 | 2020-12-25 | Tow washing device and tow washing method |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211074189.XA Division CN115233326A (en) | 2020-12-25 | 2020-12-25 | Tow washing method and device |
| CN202211073961.6A Division CN115323516A (en) | 2020-12-25 | 2020-12-25 | Six-effect evaporation, condensation and recovery device and method for fiber tow washing water |
| CN202211073968.8A Division CN115262040A (en) | 2020-12-25 | 2020-12-25 | Polyvinyl alcohol fiber strand mirabilite online recovery device and method |
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| Publication Number | Publication Date |
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| CN112725915A CN112725915A (en) | 2021-04-30 |
| CN112725915B true CN112725915B (en) | 2022-08-02 |
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| CN202211073961.6A Pending CN115323516A (en) | 2020-12-25 | 2020-12-25 | Six-effect evaporation, condensation and recovery device and method for fiber tow washing water |
| CN202211073968.8A Pending CN115262040A (en) | 2020-12-25 | 2020-12-25 | Polyvinyl alcohol fiber strand mirabilite online recovery device and method |
| CN202211074189.XA Pending CN115233326A (en) | 2020-12-25 | 2020-12-25 | Tow washing method and device |
| CN202011565831.5A Active CN112725915B (en) | 2020-12-25 | 2020-12-25 | Tow washing device and tow washing method |
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| CN202211073961.6A Pending CN115323516A (en) | 2020-12-25 | 2020-12-25 | Six-effect evaporation, condensation and recovery device and method for fiber tow washing water |
| CN202211073968.8A Pending CN115262040A (en) | 2020-12-25 | 2020-12-25 | Polyvinyl alcohol fiber strand mirabilite online recovery device and method |
| CN202211074189.XA Pending CN115233326A (en) | 2020-12-25 | 2020-12-25 | Tow washing method and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115262040A (en) | 2022-11-01 |
| CN112725915A (en) | 2021-04-30 |
| CN115233326A (en) | 2022-10-25 |
| CN115323516A (en) | 2022-11-11 |
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