Lyocell solvent anion bed purification system and method

Abstract

The invention discloses a lyocell solvent anion bed purification system and method. According to the scheme, a user operates an operation end to generate an operation instruction; the controller sequentially controls the anion bed purification system and the timer to execute a corresponding purification process according to an operation instruction, and the purification process comprises an on-line process, a feeding process, an off-line process and a feed liquid treatment process. According to the lyocell solvent anion bed purification method and the lyocell solvent anion bed purification system, in the operation process, a user operates the operation end, and an operation instruction of the controller and timing of the timer correspondingly control the purification process of the anion bed purification system. And compared with the prior art, the automation degree is higher, so that the purification efficiency of the anion bed can be improved, and the misoperation phenomenon caused by different occupational qualities of operators is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lyocell production system, and in particular, relates to a lyocell solvent anode bed purification system and method. BACKGROUND

[0002] With the continuous expansion of lyocell single-line production capacity, the number of anode beds for solvent purification operation increases exponentially, and the manual operation mode of the lyocell solvent anode bed purification system (hereinafter referred to as the purification system) for daily operation seriously restricts the sustained and stable operation of production. Manual operation has low purification efficiency and high misoperation rate, and has been difficult to meet the objective needs of large-scale production. Therefore, it is particularly urgent to improve the automation level of the operation of the purification system.

[0003] Therefore, how to improve the purification efficiency of the purification system and reduce misoperation has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0004] The present application provides a lyocell solvent anode bed purification system and method to improve the purification efficiency of the purification system and reduce misoperation.

[0005] To achieve the above-mentioned purpose, the following technical solutions are disclosed:

[0006] In a first aspect, the present application provides a lyocell solvent anode bed purification method, which is executed based on an anode bed purification system, and the purification method comprises:

[0007] A user operates an operation terminal to generate an operation instruction;

[0008] A controller controls the anode bed purification system and a timer to execute a corresponding purification process according to the operation instruction, and the purification process comprises an online process, a feeding process, an offline process and a feed liquid treatment process.

[0009] In some embodiments, the purification method comprises an interlocking process, which is executed based on the online process, the feeding process or the offline process.

[0010] In some embodiments, the interlocking process comprises judging whether a misoperation point shutdown signal is received before the operation instruction is obtained; if yes, the online process, the feeding process or the offline process can be executed; otherwise, the online process, the feeding process or the offline process is not executed.

[0011] In some embodiments, the interlocking process further comprises generating an alarm signal when the misoperation point shutdown signal is not received.

[0012] In some embodiments, the purification method further comprises adding a new process to the purification process; and deleting the new process from the purification process.

[0013] In some embodiments, the adding process comprises a heating process or a preheating process.

[0014] In a second aspect, the present application provides a lyocell solvent cathode purification system, which can perform the purification method disclosed in any one of the above aspects, and comprises a cathode, a feed pump, a feed liquid treatment pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a fifth regulating valve and a sixth regulating valve, wherein the feed pump is connected to the first feed port of the cathode through the first regulating valve, and the second regulating valve is connected to the second feed port of the cathode; the feed liquid treatment pump is connected to the second feed port of the cathode through the third regulating valve; the fourth regulating valve is connected to the first feed port; the fifth regulating valve is connected to the exhaust port of the cathode; and the sixth regulating valve is connected to the second feed port.

[0015] The on-line process: switching the first regulating valve to be in an open state, switching the second regulating valve to be in an open state after a first preset time interval, and switching the feed pump to be in an open state after a second preset time interval.

[0016] The running process: the first regulating valve, the second regulating valve and the feed pump are kept in an open state, and a first start timing is performed.

[0017] The off-line process: switching the feed pump to be in a closed state, switching the fifth regulating valve to be in a closed state after a third preset time interval, and switching the feed pump to be in a closed state after a fourth preset time interval; and a first stop timing is performed.

[0018] The feed liquid treatment process: switching the third regulating valve and the fourth regulating valve to be in an open state, switching the feed liquid treatment pump to be in an open state, and performing a second start timing; the feed liquid treatment process is ended, the feed liquid treatment pump is switched to be in a closed state, the third regulating valve is switched to be in a closed state after a fourth preset time interval, the fourth regulating valve is switched to be in a closed state after a fifth preset time interval, and a second stop timing is performed.

[0019] In some embodiments, the operation terminal comprises an operation module, and the operation instruction can be generated through the operation module.

[0020] In some embodiments, the operation terminal further comprises an editing module, and the adding process can be added or deleted through the editing module.

[0021] In some embodiments, the operation terminal is a mobile phone or a computer.

[0022] As can be seen from the above technical solutions, in the lyocell solvent cathode purification method and system of the present application, the purification process of the cathode purification system is controlled by the user operating the operation terminal, the controller operating the instruction and the timing of the timer during the running process. Compared with the prior art, the degree of automation is higher, thereby the cathode purification efficiency can be improved, and the occurrence of misoperation due to the difference in professional quality of the operator can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and the present invention can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0024] Figure 1 This is a schematic diagram of a Lyocell solvent anion exchange bed purification system provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the purification process of a Lyocell solvent anion exchange bed purification system provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of another purification process of a Lyocell solvent anion bed purification system provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a Lyocell solvent anion bed purification method provided in an embodiment of the present invention;

[0028] In the diagram: 1-Anion bed; 2-Feed pump; 3-Liquid treatment pump;

[0029] V1 - First regulating valve; V2 - Second regulating valve; V3 - Second regulating valve; V4 - Fourth regulating valve; V5 - Fifth regulating valve; V6 - Sixth regulating valve. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. The described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] Lyocell fiber, made from natural plant fibers, emerged in the mid-1990s and is hailed as the most valuable product in the history of man-made fibers in the past half-century. Combining the excellent properties of both natural and synthetic fibers, lyocell is a green fiber. Its raw material is cellulose, an inexhaustible resource in nature, and its production process involves no chemical reactions and uses non-toxic solvents.

[0032] Lyocell fiber uses pulp made from renewable bamboo and wood as raw materials. Advanced processes enable a solvent recovery rate of up to 99.7%, making it not only energy-saving and environmentally friendly but also sustainable. Clothing made from this fiber has a natural luster, a smooth feel, high strength, and virtually no shrinkage. It also has good moisture permeability and breathability, and blends well with wool.

[0033] As Lyocell's single-line production capacity continues to expand, the number of anion beds in solvent purification operations has increased exponentially. The manual operation of these anion bed systems severely restricts the continuous and stable operation of production. Therefore, it is necessary to optimize and conduct new research on anion bed operation procedures to address the outdated anion bed operation resulting from increased production capacity, replacing manual labor with automation and proceduralization.

[0034] The solvent N-methylmorpholine oxide (NMMO) used in the production process of lyocell fiber is a non-toxic, harmless organic solvent that can be recycled, with a solvent recovery rate as high as 99.7%. Anion bed purification is a crucial part of the solvent recovery process. Dilute solvents recovered from various workshops contain chromophore impurities. After adsorption by the anion bed resin, they are used in the next stage. As the production capacity of lyocell single lines continues to expand, the number of anion beds for solvent purification operations is increasing exponentially. Currently, each step of the system operation is basically performed manually by on-site personnel and DCS operators, resulting in low efficiency and a high rate of error.

[0035] Anion exchange beds are classified into sodium ion exchangers, cation-anion exchange beds, and plexiglass ion exchange devices. The function of anion exchange beds is to remove anions from water, except for hydroxide ions.

[0036] A water softener is also known as a sodium ion exchanger. Ion exchangers are classified into several types, including sodium ion exchangers, cation-anion exchangers, and mixed-bed exchangers. The outer shell of an ion exchange column (or exchanger) is generally made of materials such as rigid polyvinyl chloride (PVC), rigid polyvinyl chloride composite fiberglass (PVC-FRP), acrylic glass (PMMA), acrylic glass composite transparent fiberglass (PMMA-FRP), steel lined with rubber (JR), and stainless steel lined with rubber. They are mainly used in the pretreatment of water in boilers, thermal power plants, chemical plants, light industry, textiles, pharmaceuticals, biology, electronics, nuclear energy, and pure water treatment. They are also used in industrial production for softening hard water and preparing deionized water. Additionally, they can be used for decolorization and purification of food and pharmaceuticals, recovery of precious metals and chemical raw materials, and treatment of electroplating wastewater.

[0037] The technical problem to be solved by this invention is how to improve the purification efficiency of a purification system and reduce operational errors. To facilitate the reader's understanding of the technical solution claimed in this invention, a detailed description is provided below with reference to the accompanying drawings:

[0038] See Figure 1 , Figure 1A schematic diagram of a Lyocell solvent anion bed purification system (hereinafter referred to as the anion bed purification system) is shown. The anion bed purification system includes anion bed 1, feed pump 2, liquid treatment pump 3, first regulating valve V1, second regulating valve V2, third regulating valve V3, fourth regulating valve V4, fifth regulating valve V5, and sixth regulating valve V6. The feed pump 2 is connected to the first inlet of the anion bed 1 through the first regulating valve V1, and the second regulating valve V2 is connected to the second inlet of the anion bed 1. The liquid treatment pump 3 is connected to the second inlet of the anion bed 1 through the third regulating valve V3. The fourth regulating valve V4 is connected to the first inlet. The fifth regulating valve V5 is connected to the vent of the anion bed 1. The sixth regulating valve V6 is connected to the second inlet.

[0039] See Figure 2 , Figure 2 The purification method shown is based on Figure 1 The anion bed purification system shown can perform a purification process, which may include an online process, an operating process, an offline process, and a liquid treatment process, and the above processes are executed sequentially.

[0040] During the online process, the first regulating valve V1 is switched to the open state, and the second regulating valve V2 is switched to the open state at a first preset time interval; the feed pump 2 is switched to the open state at a second preset time interval.

[0041] During operation, the first regulating valve V1, the second regulating valve V2, and the feed pump 2 remain open, and the first operation begins timing.

[0042] During the offline process, feed pump 2 is switched to the off state, and the fifth regulating valve V5 is switched to the off state at the third preset time interval; feed pump 2 is switched to the off state at the fourth preset time interval; the first stop timer is run.

[0043] During the liquid treatment process, the third regulating valve V3 and the fourth regulating valve V4 are switched to the open state; the liquid treatment pump 3 is switched to the open state, and the second running timer starts; when the liquid treatment process ends, the liquid treatment pump 3 is switched to the closed state, the third regulating valve V3 is switched to the closed state after a fourth preset time interval, the fourth regulating valve V4 is switched to the closed state after a fifth preset time interval, and the second running timer stops.

[0044] To improve purification efficiency and reduce misoperation, the anion bed purification system of this invention also includes an operating terminal, a timer, and a controller.

[0045] The operator terminal is electrically connected to the controller to receive user operation commands and transmit them to the controller.

[0046] The timer is electrically connected to the controller and starts or stops timing according to the signal from the controller.

[0047] The controller is electrically connected to the operating terminal, timer, feed pump 2, liquid treatment pump 3, first regulating valve V1, second regulating valve V2, third regulating valve V3, fourth regulating valve V4, fifth regulating valve V5, and sixth regulating valve V6 respectively. The controller controls the switching of the operating states of the timer, feed pump 2, liquid treatment pump 3, first regulating valve V1, second regulating valve V2, third regulating valve V3, fourth regulating valve V4, fifth regulating valve V5, and sixth regulating valve V6 according to the operation instructions, and executes the online process, running process, offline process, and liquid treatment process according to the cycle.

[0048] In some embodiments, a single runtime cycle is used as an example:

[0049] After the controller receives the operation command from the operator, the first regulating valve V1, the second regulating valve V2 and the feed pump 2 remain open, and the timer starts running, which corresponds to the operation process.

[0050] The feed pump 2 is switched to the off state, and the fifth regulating valve V5 is switched to the off state after a third preset time interval; the feed pump 2 is switched to the off state after a fourth preset time interval; the timer stops running for the first time, which corresponds to the offline process.

[0051] Switch the third regulating valve V3 and the fourth regulating valve V4 to the open state; switch the liquid treatment pump 3 to the open state, and start the second timer; when the liquid treatment process ends, switch the liquid treatment pump 3 to the closed state, switch the third regulating valve V3 to the closed state after a fourth preset time interval, switch the fourth regulating valve V4 to the closed state after a fifth preset time interval, and stop the second timer. This is the liquid treatment process.

[0052] It should be noted that the first, second, third, and fourth preset times mentioned above can be achieved by setting a delay device. The first, second, third, and fourth preset times can be determined based on experience according to the diameter of the connecting pipeline, etc.

[0053] The timer can time both material feeding and liquid processing. The material feeding time is the difference between the first start timer and the first stop timer, and the difference between the second start timer and the second stop timer corresponds to the liquid processing time. The sum of the material feeding time and the liquid processing time constitutes one operating cycle.

[0054] Since multiple cleanroom beds 1 may operate simultaneously in actual use, each cleanroom bed 1 has its own operating terminal, timer, and controller. These components do not interfere with each other.

[0055] Because the anion bed purification system has leakage directions during the online process S1, operation process S2, and offline process S3, the anion bed purification system in this embodiment of the invention also includes an interlocking process. Specifically, during the online process S1, operation process S2, and offline process S3 of the anion bed purification system, the fifth regulating valve V5 and the sixth regulating valve V6 cannot be switched to the open state to avoid leakage caused by misoperation of the fifth regulating valve V5 and the sixth regulating valve V6.

[0056] Specifically, when the controller receives an operation command, it checks whether it simultaneously receives the closing signals of the fifth regulating valve V5 and the sixth regulating valve V6. If so, the online process S1 starts running; otherwise, the online process S1 stops running. If at least one of the fifth regulating valve V5 and the sixth regulating valve V6 is not closed, it is considered that the closing signals of the fifth regulating valve V5 and the sixth regulating valve V6 have not been received simultaneously.

[0057] If no signal indicating that at least one of the fifth regulating valve V5 or the sixth regulating valve V6 is not closed is received, an alarm signal can be generated to alert the operator or to initiate alarm processing directly. Therefore, the analgesic bed purification system also includes an alarm that sounds upon receiving an alarm signal.

[0058] The operation instructions generated by the aforementioned operation terminal include the online process S1 operation instruction, the running process S2 operation instruction, the offline process S3 operation instruction, and the material liquid treatment process S4 operation instruction. Among them, the online process S1 operation instruction corresponds to the execution of the online process S1, the running process S2 operation instruction corresponds to the execution of the running process S2, the offline process S3 operation instruction corresponds to the execution of the offline process S3, and the material liquid treatment process S4 operation instruction corresponds to the execution of the material liquid treatment process S4.

[0059] Alternatively, in some embodiments of the present invention, the operation instructions include a general operation instruction, which corresponds to the sequential execution of the online process S1, the running process S2, the offline process S3, and the liquid treatment process S4.

[0060] The aforementioned anion bed purification system can also be expanded to include new equipment and control valves. These new devices and valves can execute new processes S5, such as a heating process; in this case, the new equipment could be a heat exchanger. The corresponding operating terminal includes not only an operation module for generating operation commands but also an editing module. This editing module allows for the addition or deletion of new processes S5. Once a new process S5 is successfully added, it will be linked to the operation module.

[0061] In addition to allowing users to select the addition location during the S5 process, the aforementioned editing module allows users to choose the addition location based on specific operational needs. During the editing process, users can perform either visual or non-visual operations. Visual operations can be understood as displaying the corresponding operation interface on the display element of the operating terminal, allowing users to generate corresponding operation commands by clicking or touching the operation interface.

[0062] For example, if the operation instructions include the online process S1 operation instruction, the running process S2 operation instruction, the offline process S3 operation instruction, and the liquid treatment process S4 operation instruction, then the corresponding display element includes the online process S1 operation interface, the running process S2 operation interface, the offline process S3 operation instruction, and the liquid treatment process S4 operation interface.

[0063] When the aforementioned editing module is displayed in a visual format, the display element on the operating terminal also includes an editing interface. New operation interfaces can be added between, before, or after the aforementioned interfaces through this editing interface. The editing interface also has the function of deleting newly added operation interfaces.

[0064] The timer mentioned above can also be replaced by a liquid level sensor. By detecting the liquid level signal of the liquid level sensor, the amount of solvent inside the anion bed 1 can be obtained, so as to control the cutoff time between adjacent processes.

[0065] In addition, the aforementioned feeding time and liquid treatment time can be manually input, and the controller can control the end of the corresponding purification process based on the input feeding time and liquid treatment time. Alternatively, the anion bed purification system also includes a scanner, which directly obtains the feeding time and liquid treatment time by scanning the factory parameters of the feeding pump 2, the liquid treatment pump 3, and the anion bed 1, and controls the end of the corresponding purification process based on the calculated feeding time and liquid treatment time.

[0066] This invention also discloses a method for purifying a vaginal bed, which is based on the above-mentioned vaginal bed purification system and includes:

[0067] Step S100: The user operates the terminal to generate operation instructions;

[0068] Step S200: The controller sequentially controls the anion bed purification system and the timer to execute the corresponding purification process according to the operation instructions. The purification process includes the online process S1, the feeding process, the offline process S3, and the liquid treatment process S4.

[0069] Since the above-mentioned bed purification system has the aforementioned beneficial effects, this method also has corresponding effects, which will not be elaborated here.

[0070] In some embodiments, the purification method includes an interlocking process, which is executed based on the online process S1, the feeding process, or the offline process S3. By setting up an interlocking process, leakage due to misoperation can be avoided.

[0071] The interlocking process includes, upon receiving an operation command, determining whether a shutdown signal for a misoperation point has been received; if so, the online process S1, the feeding process, or the offline process S3 can be executed; otherwise, the online process S1, the feeding process, or the offline process S3 will not be executed. The aforementioned misoperation points are typically the fifth regulating valve V5 and the sixth regulating valve V6.

[0072] In some embodiments, the interlocking process further includes generating an alarm signal when no closing signal from the erroneous operation point is received. As described above, after generating the alarm signal, the operator can be directly prompted to sound an alarm, or an alarm device can be set up. The alarm device can be an audible and visual alarm.

[0073] In some embodiments, the purification method further includes adding a new process S5 to the purification process and deleting the new process S5 from the purification process. This method is implemented through an editing module; specifically...

[0074] In some embodiments, the additional process S5 includes a heating process or a preheating process.

[0075] Example 1: The operation steps of the anion bed 1 are set as a sequential control program, and the operation is carried out according to the predetermined valve opening and closing time and sequence, including various pipeline valves and various pumps, which ultimately reduces the amount of manual work.

[0076] By 2023, the development of "Automatic Lifting Technology for Purification Bed 1 in Lyocell Fiber Production" had been completed. Currently, efforts are underway to protect related intellectual property rights, with one invention patent expected to be issued, providing comprehensive protection for the key technologies of this project.

[0077] Under large-scale production conditions, except for a few operations that require manual sampling, other operations can be basically achieved through automated sequential control programs; this greatly reduces the workload of on-site employees and reduces solvent leaks caused by misoperation. In November 2022, there were two solvent leak incidents due to misoperation. After automation upgrades, no solvent leak incidents have occurred as of October 2023; it also saves labor costs, reducing the number of people per shift from 15 at the beginning of the machine to the current 6 people per shift.

[0078] In the above context, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0079] In the description of the embodiments of the present invention, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0080] It should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0081] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed, and is not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. The scope of the invention is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A method for purifying Lyocell solvent using an anion exchange bed, characterized in that, The purification method is performed based on an anion bed purification system, and the purification method includes: Users operate the terminal to generate operation commands; The controller sequentially controls the anion bed purification system and the timer to perform the corresponding purification process according to the operation instructions. The purification process includes the online process, the feeding process, the offline process, and the liquid treatment process.

2. The purification method as described in claim 1, characterized in that, The purification method includes an interlocking process, which is executed based on the online process, the feeding process, or the offline process.

3. The purification method as described in claim 2, characterized in that, The interlocking process includes, upon receiving an operation instruction, determining whether a shutdown signal for a misoperation point has been received; if so, the online process, the feeding process, or the offline process can be executed. Otherwise, the online process, the feeding process, or the offline process will not be executed.

4. The purification method as described in claim 3, characterized in that, The interlocking process also includes generating an alarm signal when no closing signal from the erroneous operation point is received.

5. The purification method as described in claim 1, characterized in that, The purification method further includes adding a new process to the purification process and deleting the new process from the purification process.

6. The purification method as described in claim 5, characterized in that, The added process includes a heating process or a preheating process.

7. A Lyocell solvent anion exchange bed purification system, characterized in that, The anion bed purification system can perform the purification method according to any one of claims 1 to 6. The anion bed purification system includes an anion bed, a feed pump, a liquid treatment pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a fifth regulating valve, and a sixth regulating valve. The feed pump is connected to the first inlet of the anion bed through the first regulating valve; the second regulating valve is connected to the second inlet of the anion bed; the liquid treatment pump is connected to the second inlet of the anion bed through the third regulating valve; the fourth regulating valve is connected to the first inlet; the fifth regulating valve is connected to the exhaust port of the anion bed; and the sixth regulating valve is connected to the second inlet. Online process: Switch the first regulating valve to the open state, and switch the second regulating valve to the open state at a first preset time interval; switch the feed pump to the open state at a second preset time interval; Operation process: The first regulating valve, the second regulating valve, and the feed pump remain open, and the timing begins at the start of the first operation; Offline process: Switch the feed pump to the off state, switch the fifth regulating valve to the off state after a third preset time interval; switch the feed pump to the off state after a fourth preset time interval; run the first stop timer; Liquid treatment process: Switch the third and fourth regulating valves to the open state; switch the liquid treatment pump to the open state, and start the second run timer; when the liquid treatment process ends, switch the liquid treatment pump to the closed state, switch the third regulating valve to the closed state after a fourth preset time interval, switch the fourth regulating valve to the closed state after a fifth preset time interval, and stop the second run timer.

8. The purification system as described in claim 7, characterized in that, The operating terminal includes an operating module, through which operating instructions can be generated.

9. The purification system as described in claim 8, characterized in that, The operating terminal also includes an editing module, through which new processes can be added or deleted.

10. The purification system as described in claim 9, characterized in that, The operating terminal is a mobile phone or a computer.

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