WO2023035288A1 - Control method and system suitable for treating viscose waste liquid by means of bipolar membrane in spinning system - Google Patents

Abstract

A control method and system suitable for treating a viscose waste liquid by means of a bipolar membrane in a spinning system, relating to the field of viscose fiber production. The control system is provided in a viscose fiber production line, and specifically comprises a bipolar membrane controller for performing electrodialysis treatment on the viscose waste liquid; the bipolar membrane controller is connected to a human-computer interface by means of a data input interface; the bipolar membrane controller is connected to a data acquisition unit by means of a data feedback interface; and the bipolar membrane controller is connected to an execution unit by means of a data output interface. The control system and control method for treating the viscose waste liquid by means of the bipolar membrane are configured, such that the automation of treating the viscose waste liquid in a spinning process by bipolar membrane electrodialysis is realized, the labor intensity is reduced, and the stability, the controllability, and the traceability of viscose waste liquid treatment are ensured; and the viscose waste liquid is effectively treated, such that the waste liquid is recycled, and the environmental protection pressure is reduced.

Description

A control method and system for treating viscose waste liquid with bipolar membrane suitable for spinning system technical field

The invention relates to a control system suitable for a spinning system, in particular to a control method and system for treating viscose waste liquid with a bipolar membrane suitable for a spinning system, and belongs to the field of viscose fiber production.

Background technique

Viscose fiber is a chemical fiber made of polymer materials containing natural cellulose, such as wood pulp and cotton pulp, through chemical and mechanical processing. It is the most similar type of chemical fiber to natural fiber clothing. Breathable, elegant hanging, bright dyeing, antistatic and easy for textile processing, etc., it is derived from natural and superior to natural regenerated cellulose fiber, and is one of the important raw materials for the textile industry. The production and spinning of viscose fiber requires a large amount of chemical raw materials, which leads to a large amount of harmful waste liquid. The waste liquid contains sulfuric acid, zinc sulfate, carbon disulfide, cellulose, dissolved organic matter, etc., which are very harmful to the environment. It is one of the main sources of pollution in the textile industry.

For example, in the process of viscose fiber molding, the viscose acts with the acidic coagulation bath to neutralize the alkali, decompose sodium cellulose sulfonate and regenerate hydrated cellulose, and the cellulose sulfonate in viscose during this process , free NaOH, and Na ₂ CS ₃ , polysulfur compounds and other side reaction products will react with sulfuric acid in the coagulation bath to form sodium sulfate. Viscose fiber production includes the acid bath process that consumes sulfuric acid, and also includes the pulp soaking process that consumes sodium hydroxide, the alkali cellulose sulfonate dissolution process, the waste gas absorption process, the scouring and pressure washing process, and the acid water neutralization process. Among them, in the spinning process, the sodium sulfate content in the coagulation bath is constantly increasing so that it cannot meet the requirements of the process. If only the raw materials consumed in the coagulation bath are added to supplement its concentration and recycled, the total amount of the coagulation bath will be reduced. The coagulation bath can only be discharged regularly and quantitatively, and the acid, salt, metal ions, etc. in it will cause serious environmental pollution, bring huge pressure to sewage treatment and cause a huge waste of resources.

For the treatment of viscose and spinning waste liquid, the following methods are mainly adopted:

1. Use low-temperature crystallization and high-temperature crystallization methods to remove excess sodium salts, including: concentrated acid bath→low-temperature/high-temperature crystallization→deglauber’s salt→roasting→drying→derivative sodium salt, but it is produced due to high-temperature crystallization of sodium sulfate in the coagulation bath Sodium sodium sulfate contains many impurities and its low added value makes it unable to produce economic benefits, and a large amount of solid salt cannot be processed, which still brings certain pressure to environmental protection;

2. Use calcium carbonate to neutralize the waste liquid, dilute it with a large amount of water until it reaches the standard, and then discharge it. This treatment method has the disadvantages of high resource consumption, environmental pollution, and poor production environment.

At present, bipolar membrane electrodialysis technology is mainly used in the fields of seawater desalination, flue gas desulfurization, wine production, organic acid recovery, etc. At the same time, it is also gradually used in the treatment of viscose and spinning waste liquid in the textile field. Limited treatment effect (such as: prior art " CN103342433A, a kind of viscose fiber sodium sulfate waste liquid adopts the method for bipolar membrane electrodialysis to reclaim acid-base ", " CN103388198A, a kind of bipolar membrane electrodialysis from viscose fiber Sodium sulfate waste liquor to produce acid-base method", "CN103351041A, a kind of electrodialysis alkali recovery process in viscose fiber production" etc.); developed to industrialized large-scale production, acid-base salt is completely digested, without other by-products and waste produce, realize resource recycling and zero discharge (such as: prior art "CN109133448A, a kind of recycling and environmental protection treatment process and system of viscose waste liquid", "CN109133446A, a kind of on-line control system and method of viscose waste liquid " etc. ).

However, with the development and improvement of bipolar membrane electrodialysis technology used to treat viscose and spinning waste liquid, the corresponding automatic control technology is still blank.

Contents of the invention

The invention aims to overcome the deficiencies of the prior art, and proposes a control method and system for treating viscose waste liquid with a bipolar membrane suitable for a spinning system. In this technical scheme, through the setting of the control system and the corresponding control method for the treatment of viscose waste liquid by bipolar membrane, the automation of bipolar membrane electrodialysis treatment of viscose waste liquid in the spinning process is realized, the labor intensity is reduced, and the guarantee is guaranteed. The stability, controllability and traceability of viscose waste liquid treatment; at the same time, the viscose waste liquid is effectively treated to realize the recycling of waste liquid and reduce the pressure on environmental protection.

In order to realize above-mentioned technical purpose, propose following technical scheme:

This technical solution proposes a control system for treating viscose waste liquid with a bipolar membrane suitable for the spinning system, which is installed in the viscose fiber production line. The control system includes a bipolar membrane for electrodialysis treatment of the viscose waste liquid The controller, the bipolar membrane controller is connected to the man-machine interface through the data input interface, the bipolar membrane controller is connected to the data acquisition unit through the data feedback interface, and the bipolar membrane controller is connected to the execution unit through the data output interface;

The bipolar membrane controller includes a brine modulation module, a brine feed module, a temperature control module, a pressure control module, an acid outlet control module, an alkali outlet control module, a salt outlet control module, and an extreme water feed module;

The data acquisition unit is arranged in the viscose fiber production line, and the data acquisition unit includes a sensor group for data acquisition and transmission in the process of bipolar membrane electrodialysis treatment of viscose waste liquid;

The execution unit is set in the viscose fiber production line, and the execution unit includes a group of equipment for viscose waste liquid treatment and regulation;

The bipolar membrane controller is also connected with an alarm unit and a cleaning unit;

Among them, the bipolar membrane controller: on the one hand, receives the viscose waste liquid electrodialysis treatment process and its regulation information, the acid-base salt discharge concentration detection process and its regulation information, safety warning information and cleaning information input from the man-machine interface. Information, on the other hand, receives viscose waste liquid electrodialysis treatment information, acid-base salt discharge concentration detection information, safety monitoring information and cleaning information fed back from the data acquisition unit to complete information analysis, comparison and judgment; Instructions, sending data acquisition instructions through the data acquisition unit;

Man-machine interface: Complete the input of viscose waste liquid electrodialysis treatment process and its regulation information, acid-base salt discharge concentration detection process and its regulation information, safety warning information and cleaning demand information. For the layout on the man-machine interface, it can be set with a multi-function meter, an acid circulation pump running logo icon, an acid circulation pump stop logo icon, an alkali circulation pump running logo icon, an alkali circulation pump stop logo icon, a brine circulation pump running logo icon, Brine circulation pump stop sign icon, extreme water circulation pump operation sign icon, extreme water circulation pump stop sign icon, cleaning sign icon, etc.;

Data acquisition unit: receive the data acquisition instruction issued by the bipolar membrane controller, complete the collection and processing of viscose waste liquid electrodialysis treatment information, acid-base salt discharge concentration detection information and safety monitoring information during the viscose waste liquid electrodialysis treatment process Transmission, i.e. feedback to the bipolar membrane controller;

Execution unit: complete the instructions issued by the bipolar membrane controller.

Further, the sensor group includes a conductivity meter I connected with the brine modulation module, an electromagnetic flowmeter connected with the brine feed module, a temperature transmitter connected with the temperature control module, a pressure transmitter connected with the pressure control module sensor, pH sensor I connected to the acid output control module, pH sensor II connected to the alkali output control module, and conductivity meter II connected to the salt output control module.

Further, the equipment group includes a brine preparation tank and a bipolar membrane device arranged on the front side of the brine preparation tank station. It is connected to the pole water tank, the acid outlet on the bipolar membrane device is connected to the finished acid storage tank through the acid delivery pipe, the alkali outlet on the bipolar membrane device is connected to the finished alkali storage tank through the alkali delivery pipe, and the acid outlet on the bipolar membrane device is connected to the finished acid storage tank through the alkali delivery pipe. The salt port is connected to the brine storage tank through the brine pipeline;

The equipment group also includes an acid circulation tank and an alkali circulation tank. The acid circulation tank is set on the acid delivery pipe, and the acid circulation tank is connected to the acid inlet of the bipolar membrane device through the acid return pipe. An acid circulation path for bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the bipolar membrane device and the acid return pipe; an acid circulation pump, an acid heat exchanger and an acid filter are arranged on the acid return pipe;

The alkali circulation tank is set on the alkali transport pipe, and the alkali circulation tank is connected to the alkali inlet port on the bipolar membrane device through the alkali return pipe. Alkali circulation path for dialysis treatment of viscose waste liquid; alkali circulation pump, alkali heat exchanger and alkali filter are arranged on the alkali return pipe;

The brine storage tank is connected to the upper brine inlet of the bipolar membrane device through the salt return pipe, and the brine circulation for the bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the light brine supply pipe, the brine storage tank, the salt return pipe and the bipolar membrane device pathway; the brine return pipe is provided with a brine circulation pump, a brine heat exchanger and a brine filter;

The pole water tank is connected to the upper pole inlet of the bipolar membrane device through the pole water return pipe, and the pole water circulation path for the bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the pole water delivery pipe, the pole water tank and the pole water return pipe; The return pipe is provided with a polar water circulation pump, a polar water heat exchanger and a polar water filter;

The conductivity meter Ⅰ is set on the brine preparation tank, the electromagnetic flowmeter is set on the conveying pipe, and the conveying pipe is equipped with a pneumatic automatic regulating valve interlocked with the signal of the conductivity meter Ⅰ;

The temperature transmitter is set on the bipolar membrane device, and the signal interlocks between the temperature transmitter and the acid heat exchanger, alkali heat exchanger, brine heat exchanger and polar water heat exchanger;

The pressure transmitter is set on the bipolar membrane device, and the signal interlocks between the pressure transmitter and the acid circulation pump, alkali circulation pump, brine circulation pump and polar water circulation pump;

The pH sensor I is set on the acid circulation tank, and the acid delivery pipe is equipped with a solenoid valve I interlocked with the signal of the pH sensor I, and the solenoid valve I is set on the front side of the station of the acid circulation tank;

The pH sensor II is set on the alkali circulation tank, and the alkali transport pipe is equipped with a solenoid valve II interlocked with the signal of the pH sensor II, and the solenoid valve II is set on the front side of the station of the alkali circulation tank;

The conductivity meter II is set on the brine storage tank, and the solenoid valve III interlocked with the signal of the conductivity meter II is set on the salt delivery pipe, and the solenoid valve III is set on the front side of the brine storage tank station.

Further, the brine storage tank is connected with a concentrated brine inlet pipe.

Further, the alarm unit includes an alarm lamp and a loudspeaker.

Further, the bipolar membrane device is connected to an AC power supply through a circuit.

Further, the control system for treating viscose waste liquid with the bipolar membrane is connected with a control system for pre-treating viscose waste liquid, and the control system for pre-treating viscose waste liquid includes a The precipitation process control module, the filtration process control module and the adsorption process control module, the precipitation process control module controls the sedimentation tank in the precipitation process, the filtration process control module controls the waste liquid filter in the filtration process, and the adsorption process control module controls the adsorption process. The resin adsorption tower, the sedimentation tank is connected with the waste liquid filter, and the sedimentation tank is set at the rear side of the waste liquid filter station; the waste liquid filter is connected with the resin adsorption tower, and the waste liquid filter is set at the rear side of the resin adsorption tower station The resin adsorption tower is connected with the brine preparation tank, and the resin adsorption tower is arranged on the rear side of the brine preparation tank station.

In addition, this technical solution proposes a control method for treating viscose waste liquid with bipolar membranes suitable for spinning systems, and the specific steps include:

A. Pass the viscose waste liquid (including sulfuric acid solution with a concentration of 0-10g/L and sodium sulfate solution with a concentration of 80-408g/L) into the brine preparation tank, and add desalted water into the brine preparation tank , the brine modulation module controls the Na ₂ SO ₄ concentration in the brine modulation tank; when the conductivity meter I detects that the concentration of sodium sulfate solution is 80-408g/L, it sends a signal of the concentration value to the bipolar membrane controller, and the bipolar The membrane controller sends a signal to open the pneumatic automatic regulating valve, and the brine conditioning tank feeds the modulated viscose waste liquid into the bipolar membrane device;

B. Pass the modulated viscose waste liquid into the bipolar membrane device, and the temperature transmitter transmits the temperature signal to the temperature control module. When the temperature is higher or lower than the set value of 20-36 ° C, the temperature control The module sends instructions to the heat exchanger to reduce or increase the heating temperature of the heat exchanger to ensure that the temperature in the bipolar membrane device is within the set temperature range;

The pressure transmitter transmits the pressure signal to the pressure control module. When the pressure is 0.03-1.2 bar higher or lower than the set value, the pressure control module sends an instruction to the circulating pump to open or close to ensure that the bipolar membrane device The pressure is within the set pressure range;

C. When the pH sensor I detects that the acid concentration at the acid outlet is 5-150g/L, it sends a signal of the concentration value to the acid outlet control module, and the acid outlet control module sends a signal to open the solenoid valve I, and the bipolar membrane device Feed H ₂ SO ₄ obtained by electrodialysis into the finished acid storage tank;

When the pH sensor II detects that the alkali concentration at the alkali outlet is 5-150g/L, it sends a signal of the concentration value to the alkali outlet control module, and the alkali outlet control module sends a signal to open the solenoid valve II, and the bipolar membrane device sends a signal to the finished product. The NaOH obtained by electrodialysis treatment is passed into the alkali storage tank;

When the pH sensor III detects that the light brine at the salt outlet contains Na ₂ SO ₄ with a concentration of 8-15% and H ₂ SO ₄ with a concentration of 2-5%, it sends a signal of the concentration value to the salt outlet control module , the salt output control module sends a signal to open the solenoid valve III, and the bipolar membrane device discharges the light brine obtained through electrodialysis treatment for other uses (for example: the brine preparation process in the brine preparation tank).

Further, before the bipolar membrane treats the viscose waste liquid, it also includes pretreatment of the viscose waste liquid, specifically:

Collect the viscose waste liquid in the spinning system and pass it into the sedimentation tank. The sedimentation process control module controls the precipitation of the viscose waste liquid; the supernatant of the sedimentation tank is passed into the filter, and the filtration process control module controls the upper Filtrate the clear liquid; pass the filtrate into the resin adsorption tower, and the adsorption process control module controls the purification and separation of the filtrate to obtain a pure sodium sulfate solution, wherein the pure sodium sulfate solution includes a sulfuric acid solution with a concentration of 0-10g/L and a concentration of It is 80-408g/L sodium sulfate solution.

In the control system for bipolar membrane treatment of viscose waste liquid suitable for spinning system, the parameter index system involved includes:

The brine preparation module controls the concentration of Na ₂ SO ₄ in the brine preparation tank to be 80-408g/L;

The temperature control module controls the temperature inside the bipolar membrane device to be 20-36°C;

The pressure control module controls the pressure in the bipolar membrane device to be 0.03-1.2bar;

When the acid outlet control module detects that the acid concentration at the acid outlet is 5-150g/L, the solenoid valve I opens;

When the alkali outlet control module detects that the alkali concentration at the alkali outlet is 5-150g/L, the solenoid valve II opens;

When the salt outlet control module detects Na ₂ SO ₄ with a concentration of 8-15% and H ₂ SO ₄ with a concentration of 2-5% at the salt outlet, the solenoid valve III is opened.

Further, in step A, the method for controlling the concentration of Na ₂ SO ₄ in the brine preparation tank to 80-408g/L includes: feeding desalted water into the brine preparation tank; After ₂ SO ₄ is mixed with light brine, it is concentrated by multi-effect evaporation to obtain Glauber's salt and then reused in the brine preparation process; or, the NaOH obtained after bipolar membrane treatment is subjected to nanofiltration, and the obtained concentrated solution is reused in the brine modulation process.

The positional relationships such as "the front side of the station", "the rear side of the station" and "between" involved in this technical solution are defined according to the situation in the actual use state, and are conventional terms in the technical field. Conventional terms used by those skilled in the art in actual use.

In this technical solution, according to actual needs, cleaning pumps, vortex air pumps, backup pumps and corresponding regulating valves can be set in the control system.

In the description of this technical solution, it should be noted that, unless otherwise clearly stipulated and limited, "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Adopt this technical scheme, the beneficial effect that brings is:

In the present invention, the bipolar membrane electrodialysis treatment of viscose waste liquid in the spinning process has a high degree of automatic control, and the process steps involved are all independently completed by the control system. The labor intensity of personnel is low, and the cost of manpower and other costs can be effectively controlled. The stability, controllability and traceability of rubber waste liquid treatment;

The present invention effectively treats viscose waste liquid to realize waste liquid recycling, such as: 100% recycling of sodium sulfate in viscose fiber waste liquid, realizes zero discharge, reduces environmental pollution, reduces environmental protection pressure, and involves control system Processing costs are substantial.

Description of drawings

Fig. 1 is the logical connection figure of control system among the present invention;

Fig. 2 is the logical connection diagram of the bipolar membrane controller in the control system of the present invention;

Fig. 3 is a logical connection diagram of equipment in the control system of the present invention;

Fig. 4 is the layout diagram of brine storage tank, acid circulation tank, alkali circulation tank and extreme water tank in the control system of the present invention;

Fig. 5 is a partial circuit diagram involved in the present invention;

Among them, 1. bipolar membrane controller, 11. brine modulation module, 12. brine feed module, 13. temperature control module, 14. pressure control module, 15. acid outlet control module, 16. alkali outlet control module, 17 . Salt output control module, 18. Extreme water feed module, 19. Precipitation process control module, 20. Filtration process control module, 21. Adsorption process control module;

2. Man-machine interface;

3. Data acquisition unit, 30, sensor group, 301, conductivity meter I, 302, electromagnetic flowmeter, 303, temperature transmitter, 304, pressure transmitter, 305, pH sensor I, 306, pH sensor II, 307. Conductivity meter II, 308. Pneumatic automatic regulating valve;

4. Executive unit, 40, equipment group, 401, brine preparation tank, 402, bipolar membrane device, 403, delivery pipe, 404, electrode water pipe, 405, electrode water tank, 406, acid delivery pipe, 407, finished acid Storage tank, 408, alkali transport pipe, 409, finished alkali storage tank, 410, light brine transport pipe, 411, salt water storage tank, 412, acid circulation tank, 413, alkali circulation tank, 414, acid return pipe, 415, acid Circulation pump, 416, acid heat exchanger, 417, acid filter, 418, alkali return pipe, 419, alkali circulation pump, 420, alkali heat exchanger, 421, alkali filter, 422, salt return pipe, 423, brine Circulation pump, 424, brine heat exchanger, 425, brine filter, 426, pole water return pipe, 427, pole water circulation pump, 428, pole water heat exchanger, 429, pole water filter, 430, concentrated brine inlet pipe , 431, sedimentation tank, 432, waste liquid filter, 433, resin adsorption tower, 434, solenoid valve I, 435, solenoid valve II, 436, solenoid valve III;

5. Alarm unit, 51, alarm lamp, 52, loudspeaker;

6. Cleaning unit.

Detailed ways

The following clearly and completely describes the technical solutions in the embodiments of the present invention. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

This embodiment proposes a control system for treating viscose waste liquid with bipolar membranes suitable for spinning systems, specifically:

As shown in Figure 1: set in the viscose fiber production line, the control system includes a bipolar membrane controller 1 that carries out electrodialysis treatment of viscose waste liquid, and the bipolar membrane controller 1 is connected to a man-machine interface through a data input interface 2. The bipolar membrane controller 1 is connected to the data acquisition unit 3 through the data feedback interface, and the bipolar membrane controller 1 is connected to the execution unit 4 through the data output interface; as shown in Figure 2: the bipolar membrane controller 1 includes saline modulation Module 11, brine feed module 12, temperature control module 13, pressure control module 14, acid outlet control module 15, base outlet control module 16, salt outlet control module 17 and extreme water feed module 18; the data acquisition unit 3 is arranged on In the viscose fiber production line, the data acquisition unit 3 includes a sensor group 30 for data acquisition and transmission in the process of bipolar membrane electrodialysis treatment of viscose waste liquid; the execution unit 4 is arranged in the viscose fiber production line, and the execution unit 4 includes Equipment group 40 for viscose waste treatment and regulation; bipolar membrane controller 1 is also connected with alarm unit 5 (such as: including alarm lamp 51 and loudspeaker 52) and cleaning unit 6 (according to the detection of substances in the pipeline) , if the standard value is not met, the cleaning pump can be controlled to start cleaning the pipeline and material tank.).

Among them, the bipolar membrane controller 1: On the one hand, it receives the viscose waste liquid electrodialysis treatment process and its regulation information, the acid-base salt discharge concentration detection process and its regulation information, and the safety warning information input from the man-machine interface 2. and cleaning information, on the other hand, receive viscose waste liquid electrodialysis treatment information, acid-base salt discharge concentration detection information, safety monitoring information and cleaning information fed back from the data acquisition unit 3, and complete information analysis, comparison and judgment; through The execution unit 4 issues instructions, and the data acquisition unit 3 issues data acquisition instructions. The bipolar membrane device 402 is connected to an AC power source through a circuit;

Man-machine interface 2: Complete the input of viscose waste liquid electrodialysis treatment process and its regulation information, acid-base salt discharge concentration detection process and its regulation information, safety warning information and cleaning demand information. For the arrangement on the man-machine interface 2, a multi-function table, an acid circulation pump 415 running identification icon, an acid circulation pump 415 stop identification icon, an alkali circulation pump 419 operation identification icon, an alkali circulation pump 419 stop identification icon, a brine circulation Pump 423 running logo icon, brine circulation pump 423 stop logo icon, pole water circulation pump 427 operation logo icon, pole water circulation pump 427 stop logo icon, cleaning logo icon, etc.;

Data acquisition unit 3: receives the data acquisition instruction issued by the bipolar membrane controller 1, and completes the electrodialysis treatment information of viscose waste liquid, the detection information of acid-base salt discharge concentration and the safety monitoring information in the process of viscose waste liquid electrodialysis treatment. Acquisition and transmission, that is, feedback to the bipolar membrane controller 1;

Execution unit 4: complete the instruction issued by the bipolar membrane controller 1.

Example 2

Based on embodiment 1, this embodiment further,

The sensor group 30 includes a conductivity meter I 301 connected to the brine modulation module 11, an electromagnetic flowmeter 302 connected to the brine feed module 12, a temperature transmitter 303 connected to the temperature control module 13, and a pressure sensor connected to the pressure control module 14. Transmitter 304, pH sensor I 305 connected to acid outlet control module 15, pH sensor II 306 connected to base outlet control module 16, and conductivity meter II 307 connected to salt outlet control module 17 (as shown in FIG. 2 ).

As shown in Figure 3: the equipment group 40 includes a brine preparation tank 401 and a bipolar membrane device 402 arranged on the front side of the brine preparation tank 401 station, the brine preparation tank 401 and the bipolar membrane device 402 are connected by a delivery pipe 403, The bipolar membrane device 402 is connected to the pole water tank 405 through the electrode water pipe 404, the acid outlet on the bipolar membrane device 402 is connected to the finished acid storage tank 407 through the acid delivery pipe 406, and the alkali outlet on the bipolar membrane device 402 is connected to the acid tank 407 through the acid delivery pipe 406. The alkali pipe 408 is connected to a finished alkali storage tank 409, and the salt outlet on the bipolar membrane device 402 is connected to a brine storage tank 411 through a light brine pipe 410;

As shown in Figure 4: the equipment group 40 also includes an acid circulation tank 412 and an alkali circulation tank 413, the acid circulation tank 412 is arranged on the acid delivery pipe 406, and the acid circulation tank 412 feeds acid through the acid return pipe 414 and the bipolar membrane device 402 The acid circulation path for bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the acid delivery pipe 406, the acid circulation tank 412, the acid return pipe 414 and the bipolar membrane device 402; the acid return pipe 414 is provided with an acid circulation pump 415, acid heat exchanger 416 and acid filter 417;

The alkali circulation tank 413 is arranged on the alkali transport pipe 408, the alkali circulation tank 413 is connected with the alkali inlet port on the bipolar membrane device 402 through the alkali return pipe 418, the alkali transport pipe 408, the alkali circulation tank 413, the alkali return pipe 418 and the bipolar membrane An alkali circulation path for bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the devices 402; an alkali circulation pump 419, an alkali heat exchanger 420 and an alkali filter 421 are arranged on the alkali return pipe 418;

The brine storage tank 411 is connected to the upper brine inlet of the bipolar membrane device 402 through the salt return pipe 422, and the bipolar membrane electrodialysis treatment is formed between the light brine delivery pipe 410, the brine storage tank 411, the salt return pipe 422 and the bipolar membrane device 402 The brine circulation path of the viscose waste liquid; the brine return pipe is provided with a brine circulation pump 423, a brine heat exchanger 424 and a brine filter 425;

The pole water tank 405 is connected to the upper pole inlet of the bipolar membrane device 402 through the pole water return pipe 426, and a bipolar membrane is formed between the pole water delivery pipe 404, the pole water tank 405 and the pole water return pipe 426 to treat viscose waste liquid by electrodialysis. Pole water circulation path; pole water return pipe 426 is provided with pole water circulation pump 427, pole water heat exchanger 428 and pole water filter 429;

The conductivity meter I301 is set on the brine preparation tank 401, the electromagnetic flowmeter 302 is set on the conveying pipe 403, and the conveying pipe 403 is provided with a pneumatic automatic regulating valve 308 interlocked with the signal of the conductivity meter I301;

The temperature transmitter 303 is arranged on the bipolar membrane device 402, and the temperature transmitter 303 is interlocked with the acid heat exchanger 416, the alkali heat exchanger 420, the brine heat exchanger 424 and the polar water heat exchanger 428;

The pressure transmitter 304 is arranged on the bipolar membrane device 402, and the signal interlocking between the pressure transmitter 304 and the acid circulation pump 415, the alkali circulation pump 419, the brine circulation pump 423 and the polar water circulation pump 427;

The pH sensor I305 is set on the acid circulation tank 412, the acid delivery pipe 406 is provided with a solenoid valve I434 interlocked with the signal of the pH sensor I305, and the solenoid valve I434 is set on the front side of the acid circulation tank 412 station;

The pH sensor II306 is arranged on the alkali circulation tank 413, and the alkali transport pipe 408 is provided with a solenoid valve II435 interlocked with the signal of the pH sensor II306, and the solenoid valve II435 is arranged on the front side of the station of the alkali circulation tank 413;

The conductivity meter II307 is installed on the brine storage tank 411, and the solenoid valve III436 interlocked with the signal of the conductivity meter II307 is arranged on the salt delivery pipe, and the solenoid valve III436 is arranged on the front side of the brine storage tank 411 station.

Example 3

Based on embodiment 1-2, this embodiment further,

The brine storage tank 411 is connected with a concentrated brine inlet pipe 430 for adjusting the concentration of brine in the brine storage tank 411 to ensure the effective operation of the electrodialysis process of the bipolar membrane device 402 . In addition, both the acid circulation tank 412 and the alkali circulation tank 413 are connected with water inlet pipes.

Example 4

Based on Embodiment 1-3, this embodiment further,

The control system for treating viscose waste liquid with bipolar membrane is connected with the control system for pretreating viscose waste liquid, and the control system for pretreating viscose waste liquid includes a precipitation process control module 19 for pretreating viscose waste liquid , the filtration process control module 20 and the adsorption process control module 21, the precipitation process control module 19 controls the sedimentation tank 431 in the precipitation process, the filtration process control module 20 controls the waste liquid filter 432 in the filtration process, and the adsorption process control module 21 controls the adsorption The resin adsorption tower 433 in the process, the settling tank 431 is connected with the waste liquid filter 432, and the settling tank 431 is arranged on the rear side of the station of the waste liquid filter 432; the waste liquid filter 432 is connected with the resin adsorption tower 433, and the waste liquid is filtered The device 432 is arranged on the rear side of the resin adsorption tower 433; the resin adsorption tower 433 is connected to the brine preparation tank 401, and the resin adsorption tower 433 is arranged on the rear side of the brine preparation tank 401 station.

Example 5

Based on Examples 1-4, this example proposes a control method for treating viscose waste liquid with bipolar membranes suitable for spinning systems,

Specific steps include:

A. Pass the viscose waste liquid (for: including the sulfuric acid solution with a concentration of 0-10g/L and the sodium sulfate solution with a concentration of 80-408g/L) into the brine preparation tank 401, and add In addition to salt water, the salt water preparation module 11 controls the Na2SO4 concentration in the salt water preparation tank 401; when the conductivity meter I301 detects that the concentration of the sodium sulfate solution is 80-408g/L, it sends a signal of the concentration value to the bipolar membrane controller 1, The bipolar membrane controller 1 sends a signal to open the pneumatic automatic regulating valve 308, and the brine conditioning tank 401 feeds the modulated viscose waste liquid into the bipolar membrane device 402;

B. Pass the modulated viscose waste liquid into the bipolar membrane device 402, and the temperature transmitter 303 transmits the temperature signal to the temperature control module 13, when the temperature is 20-36°C higher or lower than the set value , the temperature control module 13 sends an instruction to the heat exchanger to reduce or increase the heating temperature of the heat exchanger, so as to ensure that the temperature in the bipolar membrane device 402 is within the set temperature range;

The pressure transmitter 304 transmits the pressure signal to the pressure control module 14. When the pressure is 0.03-1.2 bar higher or lower than the set value, the pressure control module 14 sends an instruction to the circulating pump to turn on or off to ensure that the bipolar The pressure in the membrane device 402 is within the set pressure range;

C. When the pH sensor I305 detects that the acid concentration at the acid outlet is 5-150g/L, it sends a signal of the concentration value to the acid outlet control module 15, and the acid outlet control module 15 sends a signal to open the solenoid valve I434, bipolar The membrane device 402 feeds the H2SO4 obtained by electrodialysis into the finished acid storage tank 407;

When the pH sensor II306 detects that the alkali concentration at the alkali outlet is 5-150g/L, it sends a signal of the concentration value to the alkali outlet control module 16, and the alkali outlet control module 16 sends a signal to open the solenoid valve II435, and the bipolar membrane device 402 feeds NaOH obtained through electrodialysis treatment into the finished product alkali storage tank 409;

When the pH sensor III detects that the light brine at the salt outlet contains Na2SO4 with a concentration of 8-15% and H2SO4 with a concentration of 2-5%, it sends a signal of the concentration value to the salt outlet control module 17, and the salt outlet control module 17 sends a signal to open the solenoid valve III 436, and the bipolar membrane device 402 discharges the light brine obtained through the electrodialysis treatment for other uses (for example: the brine preparation process in the brine preparation tank 401).

Among them, before the bipolar membrane treats the viscose waste liquid, it also includes the pretreatment of the viscose waste liquid, specifically:

Collect the viscose waste liquid in the spinning system and pass it into the sedimentation tank 431, and the precipitation process control module 19 controls the precipitation of the viscose waste liquid; the supernatant of the sedimentation tank 431 is passed into the filter, and the filtration process controls Module 20 controls the filtration of the supernatant; the filtrate is passed into the resin adsorption tower 433, and the adsorption process control module 21 controls the purification and separation of the filtrate to obtain a pure sodium sulfate solution, wherein the pure sodium sulfate solution includes a concentration of 0-10g/ L of sulfuric acid solution and sodium sulfate solution with a concentration of 80-408g/L.

In the control system for bipolar membrane treatment of viscose waste liquid suitable for spinning system, the parameter index system involved includes:

The brine preparation module 11 controls the Na2SO4 concentration in the brine preparation tank 401 to be 80-408g/L;

The temperature control module 13 controls the temperature inside the bipolar membrane device 402 to be 20-36°C;

The pressure control module 14 controls the pressure in the bipolar membrane device 402 to be 0.03-1.2 bar;

When the acid outlet control module 15 detects that the acid concentration at the acid outlet is 5-150g/L, the solenoid valve I434 is opened;

When the alkali outlet control module 16 detects that the alkali concentration at the alkali outlet is 5-150g/L, the solenoid valve II 435 is opened;

When the salt outlet control module 17 detects Na2SO4 with a concentration of 8-15% and H2SO4 with a concentration of 2-5% at the salt outlet, the solenoid valve III 436 is opened.

Example 6

Based on embodiment 5, this embodiment further,

In step A, the method for controlling the concentration of Na2SO4 in the brine preparation tank 401 to 80-408g/L includes: passing desalted water into the brine preparation tank 401; or, mixing the H2SO4 obtained by bipolar membrane treatment with light brine , concentrated by multi-effect evaporation to obtain Glauber’s salt and reuse it in the brine preparation process; or, perform nanofiltration on the NaOH obtained by bipolar membrane treatment, and the obtained concentrated solution is reused in the brine preparation process.

Claims (10)

1. A control system for treating viscose waste liquid with a bipolar membrane suitable for a spinning system, characterized in that it is set in a viscose fiber production line, and the control system includes a bipolar membrane for electrodialysis treatment of viscose waste liquid The controller (1), the bipolar membrane controller (1) is connected to the man-machine interface (2) through the data input interface, the bipolar membrane controller (1) is connected to the data acquisition unit (3) through the data feedback interface, and the bipolar membrane The controller (1) is connected to the execution unit (4) through the data output interface;

   The bipolar membrane controller (1) includes a brine modulation module (11), a brine feed module (12), a temperature control module (13), a pressure control module (14), an acid outlet control module (15), an alkali outlet module Control module (16), salt output control module (17) and polar water feed module (18);

   The data acquisition unit (3) is arranged in the viscose fiber production line, and the data acquisition unit (3) includes a sensor group (30) for data acquisition and transmission in the process of bipolar membrane electrodialysis treatment of viscose waste liquid;

   The execution unit (4) is arranged in the viscose fiber production line, and the execution unit (4) includes an equipment group (40) for viscose waste liquid treatment and regulation;

   The bipolar membrane controller (1) is also connected with an alarm unit (5) and a cleaning unit (6).
2. The control system for treating viscose waste liquid with bipolar membranes suitable for spinning systems according to claim 1, characterized in that the sensor group (30) includes a conductivity meter I connected to the brine modulation module (11) (301), the electromagnetic flowmeter (302) connected with the brine feed module (12), the temperature transmitter (303) connected with the temperature control module (13), the pressure transmitter connected with the pressure control module (14) sensor (304), the pH sensor I (305) connected with the acid control module (15), the pH sensor II (306) connected with the base control module (16) and the conductivity sensor connected with the salt control module (17) Rate meter II (307).
3. The control system applicable to the bipolar membrane processing viscose waste liquid of the spinning system according to claim 2, characterized in that, the equipment group (40) includes a brine conditioning tank (401) and is arranged in the brine conditioning tank ( 401) The bipolar membrane device (402) on the front side of the station, the brine preparation tank (401) and the bipolar membrane device (402) are connected through the delivery pipe (403), and the bipolar membrane device (402) is connected through the water delivery pipe (404) is connected with pole water tank (405), and the acid outlet on the bipolar membrane device (402) is connected with the finished product acid storage tank (407) by the acid delivery pipe (406), and the alkali is discharged on the bipolar membrane device (402). The outlet is connected with a finished alkali storage tank (409) through an alkali delivery pipe (408), and the salt outlet on the bipolar membrane device (402) is connected with a brine storage tank (411) through a light brine delivery pipe (410);

   The equipment group (40) also includes an acid circulation tank (412) and an alkali circulation tank (413), the acid circulation tank (412) is arranged on the acid transport pipe (406), and the acid circulation tank (412) passes through the acid return pipe (414) It is connected to the acid inlet of the bipolar membrane device (402), and the bipolar membrane electrodialysis treatment is formed between the acid delivery pipe (406), the acid circulation tank (412), the acid return pipe (414) and the bipolar membrane device (402). The acid circulation path of the viscose waste liquid; the acid return pipe (414) is provided with an acid circulation pump (415), an acid heat exchanger (416) and an acid filter (417);

   The alkali circulation tank (413) is arranged on the alkali transport pipe (408), the alkali circulation tank (413) is connected with the alkali inlet port on the bipolar membrane device (402) through the alkali return pipe (418), the alkali transport pipe (408), the alkali An alkali circulation path for bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the circulation tank (413), the alkali return pipe (418) and the bipolar membrane device (402); the alkali return pipe (418) is provided with an alkali circulation pump (419), alkali heat exchanger (420) and alkali filter (421);

   The brine storage tank (411) is connected to the brine inlet on the bipolar membrane device (402) through the salt return pipe (422), and the light brine delivery pipe (410), the brine storage tank (411), the salt return pipe (422) and the bipolar A brine circulation channel for bipolar membrane electrodialysis treatment of viscose waste liquid is formed between the membrane devices (402); a brine circulation pump (423), a brine heat exchanger (424) and a brine filter (425) are arranged on the brine return pipe ;

   The pole water tank (405) is connected to the upper pole inlet of the bipolar membrane device (402) through the pole water return pipe (426), between the pole water delivery pipe (404), the pole water tank (405) and the pole water return pipe (426) Forming a polar water circulation channel for bipolar membrane electrodialysis treatment of viscose waste liquid; a polar water circulation pump (427), a polar water heat exchanger (428) and a polar water filter (429) are arranged on the polar water return pipe (426);

   The conductivity meter I (301) is set on the brine preparation tank (401), the electromagnetic flowmeter (302) is set on the conveying pipe (403), and the conveying pipe (403) is provided with a signal connection with the conductivity meter I (301). The pneumatic automatic regulating valve (308) of the lock;

   The temperature transmitter (303) is arranged on the bipolar membrane device (402), and the temperature transmitter (303) is connected with the acid heat exchanger (416), the alkali heat exchanger (420), the brine heat exchanger (424) and Signal interlocking between pole water heat exchangers (428);

   The pressure transmitter (304) is arranged on the bipolar membrane device (402), and the pressure transmitter (304) and the acid circulation pump (415), the alkali circulation pump (419), the brine circulation pump (423) and the polar water circulation pump (427) signal interlocking between;

   The pH sensor I (305) is installed on the acid circulation tank (412), the acid delivery pipe (406) is equipped with a solenoid valve I (434) interlocked with the signal of the pH sensor I (305), and the solenoid valve I (434) is set On the front side of the acid circulation tank (412) station;

   The pH sensor II (306) is set on the alkali circulation tank (413), the alkali delivery pipe (408) is provided with a solenoid valve II (435) interlocked with the signal of the pH sensor II (306), and the solenoid valve II (435) is set On the front side of the alkali circulation tank (413) station;

   The conductivity meter II (307) is set on the brine storage tank (411), and the solenoid valve III (436) interlocked with the signal of the conductivity meter II (307) is set on the salt delivery pipe, and the solenoid valve III (436) is set on The front side of the brine storage tank (411) station.
4. The control system for treating viscose waste liquid with a bipolar membrane suitable for spinning systems according to claim 3, characterized in that the brine storage tank (411) is connected with a concentrated brine inlet pipe (430).
5. The control system for treating viscose waste liquid with a bipolar membrane suitable for a spinning system according to claim 4, characterized in that the alarm unit (5) includes an alarm lamp (51) and a loudspeaker (52).
6. According to claim 5, the control system applicable to the bipolar membrane treatment of viscose waste liquid in the spinning system is characterized in that, the control system of the bipolar membrane treatment of viscose waste liquid is connected with the pretreatment viscose waste liquid A control system, the control system of the pretreatment viscose waste liquid includes a precipitation process control module (19), a filtration process control module (20) and an adsorption process control module (21) for pretreating the viscose waste liquid, The sedimentation process control module (19) controls the sedimentation tank (431) in the precipitation process, the filtration process control module (20) controls the waste liquid filter (432) in the filtration process, and the adsorption process control module (21) controls the waste liquid filter (432) in the adsorption process. The resin adsorption tower (433), the settling tank (431) is connected with the waste liquid filter (432), and the settling tank (431) is arranged on the station rear side of the waste liquid filter (432); the waste liquid filter (432) is connected with the waste liquid filter (432) The resin adsorption tower (433) is connected, and the waste liquid filter (432) is arranged on the rear side of the resin adsorption tower (433) station; the resin adsorption tower (433) is connected with the brine preparation tank (401), and the resin adsorption tower (433) is set On the rear side of the brine preparation tank (401) station.
7. A control method for treating viscose waste liquid with a bipolar membrane suitable for a spinning system according to claim 6, characterized in that it includes the following:

   A. Pass the viscose waste liquid into the brine preparation tank (401), add desalted water into the brine preparation tank (401), and the brine preparation module (11) controls the Na2SO4 concentration in the brine preparation tank (401); When the rate meter I (301) detects that the concentration of the sodium sulfate solution is the set value, it sends a signal of the concentration value to the bipolar membrane controller (1), and the bipolar membrane controller (1) sends a signal to open the pneumatic automatic regulating valve (308 ) signal, the saline modulation tank (401) passes into the viscose waste liquid after modulation in the bipolar membrane device (402);

   B. Pass the modulated viscose waste liquid into the bipolar membrane device (402), and the temperature transmitter (303) transmits the temperature signal to the temperature control module (13), when the temperature is higher or lower than the set value, the temperature control module (13) sends an instruction to the heat exchanger to reduce or increase the heating temperature of the heat exchanger to ensure that the temperature in the bipolar membrane device (402) is within the set temperature range;

   The pressure transmitter (304) transmits the pressure signal to the pressure control module (14). When the pressure is higher or lower than the set value, the pressure control module (14) sends an instruction to the circulating pump to open or close to ensure The pressure in the bipolar membrane device (402) is within the set pressure range;

   C. When the pH sensor I (305) detects that the acid concentration at the acid outlet is the set value, it sends a signal of the concentration value to the acid outlet control module (15), and the acid outlet control module (15) sends out a signal to open the solenoid valve I (434) signal, the bipolar membrane device (402) passes into the H2SO4 of electrodialysis treatment gained in the finished product acid storage tank (407);

   When the pH sensor II (306) detects that the alkali concentration at the alkali outlet is the set value, it sends a signal of the concentration value to the alkali outlet control module (16), and the alkali outlet control module (16) sends a signal to open the solenoid valve II (435 ) signal, the bipolar membrane device (402) feeds the NaOH obtained through electrodialysis treatment into the finished product alkali storage tank (409);

   When the pH sensor III detects that the light brine at the salt outlet contains Na2SO4 with a set value and H2SO4 with a set value, it sends a signal of the concentration value to the salt outlet control module (17), and the salt outlet control module (17) Send a signal to open the solenoid valve III (436), and the bipolar membrane device (402) discharges the light brine obtained through electrodialysis treatment for other uses.
8. According to the control method for treating viscose waste liquid with a bipolar membrane suitable for spinning system according to requirement 7, it is characterized in that, before the bipolar membrane processes viscose waste liquid, it also includes pretreatment of viscose waste liquid, include:

   Collect the viscose waste liquid in the spinning system and pass it into the sedimentation tank (431), and the precipitation process control module (19) controls the precipitation of the viscose waste liquid; pass the supernatant of the sedimentation tank (431) into the filter In the filter, the filtration process control module (20) controls the filtration of the supernatant; the filtrate is passed into the resin adsorption tower (433), and the adsorption process control module (21) controls the purification and separation of the filtrate to obtain pure sodium sulfate solution, wherein, Pure sodium sulfate solution includes sulfuric acid solution with concentration of 0-10g/L and sodium sulfate solution with concentration of 80-408g/L.
9. According to the control method applicable to the bipolar membrane processing viscose waste liquid in the spinning system described in claim 8, it is characterized in that the parameter index system of the set value includes:

   The brine preparation module (11) controls the Na2SO4 concentration in the brine preparation tank (401) to be 80-408g/L;

   The temperature control module (13) controls the temperature in the bipolar membrane device (402) to be 20-36°C;

   The pressure control module (14) controls the internal pressure of the bipolar membrane device (402) to be 0.03-1.2 bar;

   When the acid outlet control module (15) detects that the acid concentration at the acid outlet is 5-150g/L, the solenoid valve I (434) is opened;

   When the alkali outlet control module (16) detects that the alkali concentration at the alkali outlet is 5-150g/L, the solenoid valve II (435) is opened;

   When the salt outlet control module (17) detects Na2SO4 with a concentration of 8-15% and H2SO4 with a concentration of 2-5%, the solenoid valve III (436) is opened.
10. According to the control method for treating viscose waste liquid with a bipolar membrane suitable for spinning system according to claim 9, it is characterized in that, in step A, the brine modulation module (11) controls the Na2SO4 concentration in the brine modulation tank (401) Methods for 80-408g/L include:

    Pass desalinated water into the brine preparation tank (401); or, after mixing the H2SO4 obtained by the bipolar membrane treatment with light brine, concentrate through multi-effect evaporation to obtain Glauber's salt and reuse it in the brine preparation process; or, The NaOH obtained by bipolar membrane treatment is subjected to nanofiltration, and the obtained concentrated solution is reused in the brine preparation process.

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