Washing system suitable for aramid 1414 fiber production line

Abstract

The utility model discloses a washing system suitable for an aramid 1414 fiber production line, which comprises a first-stage washing tank, a second-stage washing tank, a third-stage washing tank and a fourth-stage washing tank which are connected in sequence, the first-stage washing tank is connected with a demineralized water inlet pipe I, the second-stage washing tank is connected with a concentrated alkali liquor inlet pipe, and the third-stage washing tank is connected with a dilute alkali liquor inlet pipe; the fourth-stage washing tank is connected with a dilute alkali liquid storage tank through a washing liquid recycling pipe I; the third-stage washing tank is connected with the second-stage washing tank through a washing liquid recycling pipe II; the second-stage washing tank is connected with a reflux inlet on the second-stage washing tank through a reflux pipe, an overflow port is formed in the second-stage washing tank, and the overflow port is connected with an overflow pipe; and a regulating pipeline for stabilizing the concentration of alkali liquor in the secondary washing tank is formed among the concentrated alkali liquor inlet pipe, the washing liquor recycling pipe II, the return pipe and the overflow pipe. According to the washing system, on one hand, the usage amount of alkali liquor and demineralized water is saved, and on the other hand, the discharge amount of sewage is reduced, so that the generation of Na2S04 in the washing sewage treatment process is reduced.

Description

Technical Field

[0001] This utility model relates to a washing system, specifically a washing system suitable for aramid 1414 fiber production lines, and belongs to the field of aramid 1414 production technology. Background Technology

[0002] Rubber reinforcing materials are among the most important raw materials influencing the development of the rubber industry. The industry has evolved from cotton to synthetic fibers, and further to steel cord, bead wire, and steel rope reinforcing materials. With the global automotive industry's focus on energy conservation, environmental protection, and safety, high-performance reinforcing materials, represented by aramid fiber, have been developed in recent years. Poly(p-phenylene terephthalamide) fiber, also known as aramid 1414 fiber or para-aramid fiber, is a high-strength, high-modulus organic synthetic fiber widely used in important fields such as bulletproofing, automotive hoses, and optical cables. It is a crucial basic material for aerospace and national defense industries.

[0003] Currently, the production process of aramid 1414 fiber generally involves polymerizing terephthaloyl chloride (TPC) and p-phenylenediamine (PPDA) in a solvent system to generate poly(p-phenylenediamine terephthalamide) polymer. Then, neutralization, pulping, spinning, and washing are performed to finally obtain aramid 1414 fiber. During the washing process, the aramid 1414 fiber needs to be washed with demineralized water, and excess sulfuric acid needs to be neutralized with alkaline solution (NaOH solution). This results in a large consumption of demineralized water, leading to high costs. Furthermore, the presence of residual sulfuric acid can cause the aramid 1414 fiber to become brittle, severely affecting its quality.

[0004] Although the existing technology CN219217779U discloses "a treatment system suitable for continuous spinning rinsing water recycling", it mainly achieves rinsing water recycling by filtering, adding alkali to adjust the pH value and heating the recycled rinsing water. Therefore, how to ensure the effective recycling of washing liquid and the stability of washing alkali concentration are urgent problems to be solved. Summary of the Invention

[0005] To ensure effective reuse of washing liquid and stable concentration of washing alkali, a washing system suitable for aramid 1414 fiber production lines is proposed. This system includes a demineralized water inlet pipe I, a concentrated alkali inlet pipe, a dilute alkali inlet pipe, a demineralized water inlet pipe II, a return pipe, an overflow pipe, a washing liquid reuse pipe I, and a washing liquid reuse pipe II. This design saves on the amount of alkali and demineralized water used and reduces wastewater discharge, thereby decreasing the generation of Na2SO4 during the washing wastewater treatment process.

[0006] To achieve the above technical objectives, the following technical solution is proposed:

[0007] A washing system suitable for an aramid 1414 fiber production line includes a primary washing tank, a secondary washing tank, a tertiary washing tank, and a quaternary washing tank connected in sequence. The primary washing tank is connected to a demineralized water storage tank via a demineralized water inlet pipe I. The secondary washing tank is connected to a concentrated alkali solution storage tank via a concentrated alkali solution inlet pipe. The tertiary washing tank is connected to a dilute alkali solution storage tank via a dilute alkali solution inlet pipe. The quaternary washing tank is connected to a demineralized water storage tank via a demineralized water inlet pipe II. The primary, secondary, tertiary, and quaternary washing tanks form a continuous path for washing aramid 1414 fibers.

[0008] The washing liquid outlet of the fourth-stage washing tank is connected to the dilute alkali storage tank through washing liquid reuse pipe I.

[0009] The washing liquid outlet of the tertiary washing tank is connected to the secondary washing tank through washing liquid reuse pipe II.

[0010] The washing liquid outlet on the secondary washing tank is connected to the return port on the secondary washing tank via a return pipe. The secondary washing tank is equipped with an overflow port, which is connected to an overflow pipe.

[0011] The concentrated alkali inlet pipe, washing liquid return pipe II, return pipe and overflow pipe form a regulating pipeline to stabilize the alkali concentration in the secondary washing tank.

[0012] Preferably, the reflux pipe is equipped with a reflux regulating valve and a reflux flow meter, and the reflux regulating valve and the reflux flow meter are interlocked by an electrical signal.

[0013] Preferably, the concentrated alkali inlet pipe is equipped with a concentrated alkali regulating valve and a concentrated alkali flow meter, and the concentrated alkali regulating valve and the concentrated alkali flow meter are interlocked by an electrical signal.

[0014] Preferably, the washing liquid recycling pipe II is equipped with a washing liquid regulating valve I and a washing liquid flow meter I, and the washing liquid regulating valve I and the washing liquid flow meter I are interlocked by an electrical signal.

[0015] Preferably, the overflow port is connected to an overflow liquid collection tank via an overflow pipe.

[0016] Preferably, the dilute alkali inlet pipe is equipped with a dilute alkali regulating valve and a dilute alkali flow meter, and the dilute alkali regulating valve and the dilute alkali flow meter are interlocked by an electrical signal.

[0017] Preferably, the washing liquid recycling pipe I is equipped with a washing liquid regulating valve II and a washing liquid flow meter II, and the washing liquid regulating valve II and the washing liquid flow meter II are interlocked by an electrical signal.

[0018] Preferably, the secondary washing tank, tertiary washing tank, concentrated alkali solution storage tank, and dilute alkali solution storage tank are all equipped with pH detectors.

[0019] Preferably, the demineralized water storage tank is connected to the demineralized water inlet pipe I via the demineralized water outlet pipe, and the demineralized water storage tank is connected to the demineralized water inlet pipe II via the demineralized water outlet pipe. A filter and a heat exchanger are provided on the demineralized water outlet pipe. The filter is located between the demineralized water storage tank and the heat exchanger to exchange heat and filter the demineralized water entering the washing system, thereby improving the effectiveness and stability of the washing process.

[0020] In addition, both the demineralized water inlet pipe I and the demineralized water inlet pipe II are equipped with corresponding regulating valves and washing liquid flow meters.

[0021] The positional relationships such as "between" and "above" involved in this technical solution are defined according to the actual usage conditions and are common terms in this technical field, as well as common terms used by those skilled in the art in actual use.

[0022] In the description of this technical solution, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "equipped with," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technical solution based on the specific circumstances.

[0023] The beneficial technical effects of adopting this technical solution are as follows:

[0024] I. This utility model is based on the sequentially connected primary, secondary, tertiary, and quaternary washing tanks, which sequentially perform water washing, concentrated alkali washing, dilute alkali washing, and re-water washing on aramid 1414 fibers. Then, through the washing liquid return pipe I and washing liquid return pipe II, the washing liquid generated afterward is used in the previous process (backwashing), effectively saving demineralized water. Furthermore, through the arrangement of concentrated alkali, return pipe, and overflow port on the secondary washing tank, while ensuring the balance of concentrated alkali in the secondary washing tank, the amount of alkali used is effectively saved, the amount of wastewater discharged is reduced, and the generation of Na2SO4 during wastewater treatment is also reduced.

[0025] Second, in this utility model, by setting corresponding regulating valves and flow meters, the orderliness, stability, controllability and accuracy of feeding are ensured, and ultimately, the washing efficiency and quality of aramid 1414 fiber are improved. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the working principle of this utility model;

[0027] In the diagram: 1. Primary washing tank; 2. Secondary washing tank; 3. Tertiary washing tank; 4. Quaternary washing tank; 5. Demineralized water inlet pipe I; 6. Demineralized water storage tank; 7. Concentrated alkali inlet pipe; 71. Concentrated alkali regulating valve; 72. Concentrated alkali flow meter; 8. Concentrated alkali storage tank; 9. Diluted alkali inlet pipe; 91. Diluted alkali regulating valve; 92. Diluted alkali flow meter; 10. Diluted alkali storage tank; 11. Demineralized water inlet pipe II; 13. Washing... 131. Washing liquid regulating valve II, 132. Washing liquid flow meter II, 14. Washing liquid return pipe II, 141. Washing liquid regulating valve I, 142. Washing liquid flow meter I, 15. Return pipe, 151. Return liquid regulating valve, 152. Return liquid flow meter, 16. Overflow pipe, 17. Overflow liquid collection tank, 18. pH detector, 19. Demineralized water outlet pipe, 20. Filter, 21. Heat exchanger. Detailed Implementation

[0028] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0029] Example 1

[0030] A washing system suitable for aramid 1414 fiber production lines, such as Figure 1 As shown, the system includes a primary washing tank 1, a secondary washing tank 2, a tertiary washing tank 3, and a quaternary washing tank 4 connected in sequence. The primary washing tank 1 is connected to the demineralized water storage tank 6 via a demineralized water inlet pipe I 5. The secondary washing tank 2 is connected to the concentrated alkali solution storage tank 8 via a concentrated alkali solution inlet pipe 7. The tertiary washing tank 3 is connected to the dilute alkali solution storage tank 10 via a dilute alkali solution inlet pipe 9. The quaternary washing tank 4 is connected to the demineralized water storage tank 6 via a demineralized water inlet pipe II 11. The primary washing tank 1, the secondary washing tank 2, the tertiary washing tank 3, and the quaternary washing tank 4 form a continuous path for washing aramid 1414 fibers.

[0031] The washing liquid outlet of the fourth-stage washing tank 4 is connected to the dilute alkali storage tank 10 through the washing liquid reuse pipe I 13; the washing liquid outlet of the third-stage washing tank 3 is connected to the second-stage washing tank 2 through the washing liquid reuse pipe II 14; the washing liquid outlet of the second-stage washing tank 2 is connected to the return port of the second-stage washing tank 2 through the return pipe 15; the second-stage washing tank 2 is provided with an overflow port, which is connected to an overflow pipe 16; more specifically, the overflow port is connected to an overflow collection tank 17 through the overflow pipe 16; the concentrated alkali inlet pipe 7, the washing liquid reuse pipe II 14, the return pipe 15 and the overflow pipe 16 form a regulating pipeline for stabilizing the alkali concentration in the second-stage washing tank 2.

[0032] Among them, the concentrated alkali solution storage tank 8 contains a sodium hydroxide solution with a concentration of 23%; the dilute alkali solution storage tank 10 contains a sodium hydroxide solution with a concentration of less than 0.05%.

[0033] Based on the sequentially connected primary washing tank 1, secondary washing tank 2, tertiary washing tank 3, and quaternary washing tank 4, aramid 1414 fibers are sequentially washed with water, washed with concentrated alkali solution, washed with dilute alkali solution, and then washed with water again. The washing liquid is then reused in the previous process (backwashing) via washing liquid return pipe I 13 and washing liquid return pipe II 14, effectively saving demineralized water. Furthermore, the arrangement of concentrated alkali solution, return pipe 15, and overflow port on secondary washing tank 2 ensures the balance of concentrated alkali solution within secondary washing tank 2 while effectively saving alkali solution usage, reducing wastewater discharge, and decreasing the generation of Na2SO4 during wastewater treatment.

[0034] Example 2

[0035] Based on Example 1, this example further specifies the following to better provide concentrated and dilute alkali solutions to the corresponding washing tanks, ensure accurate reflux of the return liquid, and controllable reuse of the washing liquid, while also maintaining the stability of the corresponding alkali concentrations in the secondary washing tank 2 and the tertiary washing tank 3:

[0036] The concentrated alkali inlet pipe 7 is equipped with a concentrated alkali regulating valve 71 and a concentrated alkali flow meter 72, which are interlocked by an electrical signal. This is used to precisely control the feed of concentrated alkali and the concentration of alkali in the secondary washing tank 2 (e.g., 2-3% sodium hydroxide solution), thereby better coordinating with the demineralized water washing in the primary washing tank 1 and the dilute alkali washing in the tertiary washing tank 3, ensuring the washing efficiency and quality of aramid 1414 fiber in this process.

[0037] The reflux pipe 15 is equipped with a reflux liquid regulating valve 151 and a reflux liquid flow meter 152, which are interlocked by an electrical signal. This is used to precisely control the reflux of the reflux liquid and to coordinate well with the flow rates of the concentrated alkali solution inlet pipe 7, the washing liquid return pipe II 14, and the overflow pipe 16, ultimately ensuring a stable alkali solution concentration in the secondary washing tank 2.

[0038] The washing liquid recycling pipe II14 is equipped with a washing liquid regulating valve I141 and a washing liquid flow meter I142. The washing liquid regulating valve I141 and the washing liquid flow meter I142 are interlocked by an electrical signal. This is used to precisely control the recycling of washing liquid in the washing liquid recycling pipe II14, and to better coordinate with the flow rates of the concentrated alkali solution inlet pipe 7, the return liquid, and the overflow pipe 16, ultimately ensuring a stable alkali solution concentration in the secondary washing tank 2.

[0039] The dilute alkali inlet pipe 9 is equipped with a dilute alkali regulating valve 91 and a dilute alkali flow meter 92. The dilute alkali regulating valve 91 and the dilute alkali flow meter 92 are interlocked by an electrical signal. This is used to precisely control the feed of dilute alkali and control the concentration of alkali in the tertiary washing tank 3 (e.g., sodium hydroxide solution below 0.05%), thereby better coordinating with the concentrated alkali washing in the secondary washing tank 2 and the demineralized water washing in the quaternary washing tank 4, ensuring the washing efficiency and quality of aramid 1414 fiber in this process.

[0040] The washing liquid recycling pipe I 13 is equipped with a washing liquid regulating valve II 131 and a washing liquid flow meter II 132. The washing liquid regulating valve II 131 and the washing liquid flow meter II 132 are interlocked by an electrical signal. This is used to precisely control the recycling of washing liquid in the washing liquid recycling pipe I 13, and to better coordinate with the concentration of dilute alkali in the dilute alkali storage tank 10, ultimately ensuring the stability of the alkali concentration in the three-stage washing tank 3.

[0041] Example 3

[0042] Based on Examples 1-2, this example further specifies the following to better monitor the pH value and ensure effective washing:

[0043] pH detectors 18 are installed on the secondary washing tank 2, the tertiary washing tank 3, the concentrated alkali solution storage tank 8, and the dilute alkali solution storage tank 10 to monitor the pH value in the corresponding tank in real time, so as to adjust it in time and improve the controllability and timeliness of the aramid 1414 fiber washing process.

[0044] Example 4

[0045] Based on Examples 1-3, this example further specifies the following to better ensure the supply of demineralized water for effective washing:

[0046] The demineralized water storage tank 6 is connected to the demineralized water inlet pipe I 5 through the demineralized water outlet pipe 19, and the demineralized water storage tank 6 is connected to the demineralized water inlet pipe II 11 through the demineralized water outlet pipe 19. The demineralized water outlet pipe 19 is equipped with a filter 20 and a heat exchanger 21. The filter 20 is located between the demineralized water storage tank 6 and the heat exchanger 21 to exchange heat and filter the demineralized water entering the washing system, thereby improving the effectiveness and stability of the washing process.

Claims

1. A washing system suitable for an aramid 1414 fiber production line, characterized in that: The system includes a first-stage washing tank (1), a second-stage washing tank (2), a third-stage washing tank (3), and a fourth-stage washing tank (4) connected in sequence. The first-stage washing tank (1) is connected to the demineralized water storage tank (6) through the demineralized water inlet pipe I (5). The second-stage washing tank (2) is connected to the concentrated alkali solution storage tank (8) through the concentrated alkali solution inlet pipe (7). The third-stage washing tank (3) is connected to the dilute alkali solution storage tank (10) through the dilute alkali solution inlet pipe (9). The fourth-stage washing tank (4) is connected to the demineralized water storage tank (6) through the demineralized water inlet pipe II (11). A continuous path for washing aramid 1414 fibers is formed between the first-stage washing tank (1), the second-stage washing tank (2), the third-stage washing tank (3), and the fourth-stage washing tank (4). The washing liquid outlet of the fourth-stage washing tank (4) is connected to the dilute alkali storage tank (10) through the washing liquid reuse pipe I (13); The washing liquid outlet of the tertiary washing tank (3) is connected to the secondary washing tank (2) through the washing liquid recycling pipe II (14); The washing liquid outlet of the secondary washing tank (2) is connected to the return port of the secondary washing tank (2) through the return pipe (15). The secondary washing tank (2) is provided with an overflow port, and the overflow port is connected to an overflow pipe (16). The concentrated alkali inlet pipe (7), the washing liquid return pipe II (14), the return pipe (15) and the overflow pipe (16) form a regulating pipeline for stabilizing the alkali concentration in the secondary washing tank (2).

2. The washing system for an aramid 1414 fiber production line according to claim 1, characterized in that: The reflux pipe (15) is equipped with a reflux regulating valve (151) and a reflux flow meter (152), and the reflux regulating valve (151) and the reflux flow meter (152) are interlocked by an electrical signal.

3. The washing system for an aramid 1414 fiber production line according to claim 1 or 2, characterized in that: The concentrated alkali inlet pipe (7) is equipped with a concentrated alkali regulating valve (71) and a concentrated alkali flow meter (72), and the concentrated alkali regulating valve (71) and the concentrated alkali flow meter (72) are interlocked by an electrical signal.

4. The washing system for an aramid 1414 fiber production line according to claim 3, characterized in that: The washing liquid recycling pipe II (14) is equipped with a washing liquid regulating valve I (141) and a washing liquid flow meter I (142), and the washing liquid regulating valve I (141) and the washing liquid flow meter I (142) are interlocked by an electrical signal.

5. The washing system for an aramid 1414 fiber production line according to claim 1, characterized in that: The overflow port is connected to an overflow collection tank (17) via an overflow pipe (16).

6. The washing system for an aramid 1414 fiber production line according to claim 1, characterized in that: The dilute alkali inlet pipe (9) is equipped with a dilute alkali regulating valve (91) and a dilute alkali flow meter (92), and the dilute alkali regulating valve (91) and the dilute alkali flow meter (92) are interlocked by an electrical signal.

7. The washing system for an aramid 1414 fiber production line according to claim 1, characterized in that: The washing liquid recycling pipe I (13) is equipped with a washing liquid regulating valve II (131) and a washing liquid flow meter II (132). The washing liquid regulating valve II (131) and the washing liquid flow meter II (132) are interlocked by an electrical signal.

8. The washing system for an aramid 1414 fiber production line according to claim 1, characterized in that: pH detectors (18) are installed on the secondary washing tank (2), the tertiary washing tank (3), the concentrated alkali storage tank (8), and the dilute alkali storage tank (10).

9. The washing system for an aramid 1414 fiber production line according to claim 1, characterized in that: The demineralized water storage tank (6) is connected to the demineralized water inlet pipe I (5) through the demineralized water outlet pipe (19), and the demineralized water storage tank (6) is connected to the demineralized water inlet pipe II (11) through the demineralized water outlet pipe (19). A filter (20) and a heat exchanger (21) are provided on the demineralized water outlet pipe (19), and the filter (20) is located between the demineralized water storage tank (6) and the heat exchanger (21).

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