Purification treatment device

Abstract

The utility model provides a purification treatment device, and relates to the technical field of process water treatment. The purification treatment device comprises: a first cation exchange resin tank for adsorbing and extracting at least a part of oligomers and cations in water; a water inlet of a heating medium channel of the first heat exchanger is connected with a water outlet of the first cation exchange resin tank, and the first heat exchanger is used for cooling the entered extraction water; a water inlet of a heating medium channel of the second heat exchanger is connected with a water outlet of a heating medium channel of the first heat exchanger so as to cool the extraction water, so that the temperature of the extraction water flowing out of the heating medium channel of the second heat exchanger is lower than or equal to a first threshold value; the anion exchange resin tank is connected with a water outlet of the heating medium channel of the second heat exchanger; the second cation exchange resin tank is connected with the water outlet of the anion exchange resin tank; and the water outlet of the second cation exchange resin tank is connected with the water inlet of the refrigerant channel of the first heat exchanger. According to the invention, impurities in the extracted water can be removed.

Description

Technical Field

[0001] This disclosure relates to the field of process water treatment technology, and in particular to a purification treatment device. Background Technology

[0002] Nylon 6 typically has titanium dioxide added to the raw materials to improve its matting properties. However, this modified titanium dioxide usually contains inorganic impurities such as silicon and aluminum. These inorganic impurity ions enter the extraction water through extraction and then accumulate in the concentrate. The presence of these inorganic impurity ions has a negative impact on the stable operation of the production line, especially the extraction water recovery system or the concentrate production line. For example, it can cause pipeline or valve blockage and lead to severe contamination of the cast strip plate. Utility Model Content

[0003] This disclosure provides a purification device for removing impurities from extract water.

[0004] This disclosure provides a purification treatment apparatus, comprising:

[0005] Raw water tank, used to contain extracted water;

[0006] A first cation exchange resin tank is connected to the outlet of the raw water tank; the cation exchange resin in the first cation exchange resin tank is used to adsorb at least some of the oligomers and cations in the extracted water.

[0007] The first heat exchanger has its inlet of the heat medium channel connected to the outlet of the first cation exchange resin tank, so as to cool the extracted water flowing out of the first cation exchange resin tank.

[0008] The second heat exchanger has its inlet connected to the outlet of the heat medium channel of the first heat exchanger, so as to cool the extracted water entering the heat medium channel of the second heat exchanger, so that the temperature of the extracted water flowing out of the heat medium channel of the second heat exchanger is lower than or equal to a first threshold; the first threshold is less than or equal to 60°C.

[0009] An anion exchange resin tank is connected to the outlet of the heat medium channel of the second heat exchanger;

[0010] The second cation exchange resin tank is connected to the outlet of the anion exchange resin tank; the outlet of the second cation exchange resin tank is also connected to the inlet of the refrigerant channel of the first heat exchanger.

[0011] The finished product tank is connected to the outlet of the refrigerant channel of the first heat exchanger.

[0012] In some embodiments, the purification treatment apparatus further includes:

[0013] The first valve, connected to the second heat exchanger, is used to adjust the flow rate of circulating cooling water in the refrigerant passage of the second heat exchanger.

[0014] In some embodiments, the purification treatment apparatus further includes:

[0015] The first temperature sensor is used to detect the outlet water temperature of the heat medium channel corresponding to the extraction water in the second heat exchanger.

[0016] The controller is electrically connected to the first valve and the first temperature sensor respectively, and is used to control the first valve to adjust the flow rate of circulating cooling water in the second heat exchanger according to the detection result of the first temperature sensor.

[0017] In some embodiments, the purification treatment apparatus further includes:

[0018] The second valve is connected to the heat medium passage of the second heat exchanger and electrically connected to the controller; the controller is used to control the second valve to open when the temperature detected by the first temperature sensor is lower than or equal to a first threshold and equal to or higher than a second threshold, so that the extracted water can flow from the second heat exchanger to the anion exchange resin tank; the second threshold is less than the first threshold.

[0019] In some embodiments, the second threshold is greater than or equal to 40°C, and the second threshold is less than or equal to 55°C.

[0020] In some embodiments, the purification treatment apparatus further includes:

[0021] A first pipeline and a third valve are provided. The first pipeline is connected in parallel with the heat medium passage of the first heat exchanger. The third valve is located in the first pipeline and is electrically connected to the controller.

[0022] In some embodiments, a second pipeline and a fourth valve are provided, wherein the second pipeline is connected in parallel with the heat medium passage of the second heat exchanger, the fourth valve is disposed in the second pipeline, and the fourth valve is electrically connected to the controller.

[0023] In some embodiments, the first cation exchange resin tank includes a first tank body containing a sulfonic acid-based cation exchange resin.

[0024] The second cation exchange resin tank includes a second tank body containing a sulfonic acid-based cation exchange resin.

[0025] In some embodiments, the purification treatment apparatus further includes:

[0026] A first delivery pump is connected between the raw water tank and the first cation exchange resin tank;

[0027] A first filter is connected between the first delivery pump and the first cation exchange resin tank.

[0028] In some embodiments, backup devices are provided for the first cation exchange resin tank, the first heat exchanger, the second heat exchanger, the anion exchange resin tank, and the second cation exchange resin tank, respectively.

[0029] An acid tank is provided for the first cation exchange resin tank and the second cation exchange resin tank.

[0030] An alkali tank is provided for the anion exchange resin tank.

[0031] The technical solution provided in this disclosure includes at least the following beneficial effects: the first cation exchange resin tank can remove cations from the extraction water, the anion exchange resin in the anion exchange resin tank can remove anions from the extraction water, and the cation in the second cation exchange resin tank can further remove cations from the extraction water, thereby achieving the purpose of removing inorganic impurities from the extraction water and purifying the extraction water. Furthermore, by setting a first heat exchanger and a second heat exchanger between the first cation exchange resin tank and the anion exchange resin, the first cation exchange resin tank can adsorb at least some oligomers and cations in the extraction water, thereby preventing the first and second heat exchangers from becoming clogged due to the final condensation of oligomers in the extraction water. Additionally, the extraction water entering the anion exchange resin tank is below 60°C, avoiding degradation of the anion exchange resin due to prolonged high-temperature operation, extending the regeneration cycle of the anion exchange resin, and improving its service life. Simultaneously, it extends the regeneration cycle of the cation exchange resin used for deodorization, thereby reducing wastewater discharge and the frequency of resin replacement. In addition, the lower-temperature extraction water flowing out of the second cation exchange resin tank can exchange heat with the higher-temperature extraction water flowing out of the first cation exchange resin tank in the first heat exchanger, thereby saving energy and being economical and efficient.

[0032] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0033] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this disclosure and should not be construed as limiting the scope of this disclosure.

[0034] Figure 1 A schematic diagram of a purification treatment apparatus provided as an exemplary embodiment;

[0035] Figure 2 A schematic diagram of the electrical connections of a purification treatment apparatus provided in an exemplary embodiment.

[0036] Explanation of reference numerals in the attached drawings: 110 - Raw water tank; 120 - First cation exchange resin tank; 130 - First heat exchanger; 140 - Second heat exchanger; 150 - Anion exchange resin tank; 160 - Second cation exchange resin tank; 170 - Finished product tank; 180 - First transfer pump; 190 - First filter; 201 - First valve; 202 - First temperature sensor; 203 - Controller; 204 - Second valve; 205 - Third valve; 206 - Fourth valve. Detailed Implementation

[0037] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0038] The present disclosure will now be described in further detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] Nylon 6 polymerization is a reversible reaction. After polymerization, about 10% of monomers and oligomers remain, requiring extraction to separate them from the chips. The extraction water is concentrated by evaporation, and the concentrated solution is then recycled back into the polymerization reaction after further treatment. The condensate from the evaporation serves as the source of the extraction water and is recycled.

[0040] Currently, Nylon 6 is mainly used in three major fields: spinning, engineering plastics, and films. In spinning and Nylon 6, titanium dioxide is usually added to the raw materials to improve its matting properties. However, this modified titanium dioxide usually contains inorganic impurities such as silicon and aluminum. Inorganic impurity ions enter the extraction water through extraction and then accumulate in the concentrate. The presence of these inorganic ions has a serious negative impact on the stable operation of the production line, especially the extraction water recovery system or the concentrate production line. For example, it can cause pipeline and valve blockage, serious dirt on the casting strip, and the need for frequent cleaning and replacement of the strip.

[0041] In some related technologies, ion exchange resins are commonly used to treat the extraction water to remove these impurities. Generally, cation exchange resins and anion exchange resins are used together to treat the extraction water, with the treatment temperature typically between 80-90℃. However, because anion exchange resins are composed of functional groups grafted and copolymerized with trimethylammonium or amino groups, they have poor temperature resistance and will degrade and release trimethylamine (a gas with a strong fishy odor) above 60℃. Trimethylamine is a gas that is readily soluble in water and has a strong fishy odor. Even after purification by ion exchange resins, the extraction water still contains trimethylamine in the subsequent evaporation condensate. When this condensate is used to extract chips, the chips are then used in the spinning process. In the spinning workshop, trimethylamine (boiling point 2.87℃) slowly volatilizes in the equilibrium zone, further deteriorating the spinning factory environment.

[0042] To remove odors, a deodorization unit is typically added after a set of cation exchange resins and anion exchange resins. This deodorization unit may include a cation exchange resin unit. However, due to the high temperature of the extraction water during operation (80-90℃), the anion exchange resin degrades rapidly and quickly becomes ineffective, requiring replacement. This results in a large processing capacity for the deodorization unit, which quickly loses its effectiveness. Consequently, the anion exchange resin and deodorization unit require frequent regeneration, generating large amounts of wastewater, which is detrimental to environmental protection. Furthermore, the rapid deterioration of the anion exchange resin leads to increasingly shorter regeneration cycles, resulting in a high replacement frequency.

[0043] This embodiment provides a purification treatment device. The anion exchange resin in the anion exchange resin tank can remove anions from the extraction water, and the cation exchange resin in the first cation exchange resin tank and the second cation exchange resin tank can remove cations from the water, thereby achieving the purpose of removing inorganic ions from the extraction water and purifying the extraction water. By installing a first heat exchanger and a second heat exchanger between the first cation exchange resin tank and the anion exchange resin tank, the first cation exchange resin tank can adsorb at least some of the oligomers and cations in the extraction water, thereby preventing the first heat exchanger and the second heat exchanger from being blocked due to the final condensation of oligomers in the extraction water. Moreover, the extraction water entering the anion exchange resin tank is below 60°C, thereby avoiding the degradation of the anion exchange resin caused by long-term high-temperature operation, extending the regeneration cycle of the anion exchange resin, improving the service life of the anion exchange resin, and extending the regeneration cycle of the cation exchange resin used for deodorization, thereby reducing wastewater discharge and the frequency of resin replacement.

[0044] Ion exchange resins are insoluble polymeric compounds with functional groups that exchange ions, possessing a network structure. They are typically spherical particles. Ion exchange resins classified as acidic should have "cationic" added before their name; those classified as basic should have "anionic" added before their name.

[0045] The function of ion exchange resins: In aqueous solutions, cations in the water exchange resin undergo ion exchange with H+ ions generated on the resin, transferring the cations to the resin and the H+ ions from the resin back into the water. This is the principle of cation exchange resins. Similarly, anions in the aqueous solution undergo ion exchange with OH- ions generated in the water by anion exchange resin, transferring the anions to the resin and the OH- ions from the resin back into the water. This is the principle of anion exchange resins. The H+ ions combine with the OH- ions to form water, thus achieving the purpose of ion removal.

[0046] The structure, function, and implementation process of the purification treatment device in this embodiment will be illustrated below with reference to the accompanying drawings.

[0047] Please refer to Figure 1 The purification device provided in this embodiment includes: a raw water tank 110 for containing extraction water; a first cation exchange resin tank 120 connected to the outlet of the raw water tank 110; the cation exchange resin in the first cation exchange resin tank 120 is used to adsorb at least some oligomers and cations in the extraction water; a first heat exchanger 130, the inlet of the heat medium channel of the first heat exchanger 130 being connected to the outlet of the first cation exchange resin tank 120 to cool the extraction water flowing out of the first cation exchange resin tank 120; and a second heat exchanger 140, the inlet of the heat medium channel of the second heat exchanger 140 being connected to the outlet of the first heat exchanger 120. The outlet of the heat medium channel 10 is connected to the heat medium channel of the first heat exchanger 130 to cool the extracted water flowing out of the first heat exchanger 130, so that the temperature of the extracted water flowing out of the second heat exchanger 140 is lower than or equal to a first threshold; the first threshold is less than or equal to 60°C; the anion exchange resin tank 150 is connected to the outlet of the heat medium channel of the second heat exchanger 140; the second cation exchange resin tank 160 is connected to the outlet of the anion exchange resin tank 150; the outlet of the second cation exchange resin tank 160 is also connected to the inlet of the refrigerant channel of the first heat exchanger 130; the finished product tank 170 is connected to the outlet of the refrigerant channel of the first heat exchanger 130.

[0048] The raw water tank 110 may include a prismatic or cylindrical tank body, with an internal space for holding the extraction water. The raw water tank 110 has an inlet and an outlet. The inlet of the raw water tank 110 is connected to the equipment in the extraction process, and the temperature of the extraction water entering the raw water tank 110 is typically in the range of 80°C to 90°C. The raw water tank 110 is used to store the extraction water flowing out from the extraction process. The outlet of the raw water tank 110 is located near the bottom of the tank body to facilitate the outflow of the extraction water.

[0049] The outlet of the raw water tank 110 is connected to the inlet of the first cation exchange resin tank 120. The raw water tank 110 can also be indirectly connected to the first cation exchange resin tank 120. A first filter 190 can be connected between the raw water tank 110 and the first cation exchange resin tank 120. The first filter 190 is used to filter the extraction water flowing to the first cation exchange resin tank 120. The first filter 190 can be a candle filter; the filter element of the first filter 190 has a filter element precision of 30 to 150 μm, used to filter out impurities such as flakes and precipitated oligomers in the extraction water, preventing the extraction water from contaminating the resin. A first transfer pump 180 can be connected between the raw water tank 110 and the first cation exchange resin tank 120, used to draw the extraction water from the raw water tank 110 into the first cation exchange resin tank 120.

[0050] Optionally, when a first filter 190 and a first transfer pump 180 are connected between the raw water tank 110 and the first cation exchange resin tank 120, the first filter 190 is located on the side of the first transfer pump 180 facing the first cation exchange resin tank 120, so as to further reduce impurities in the extracted water entering the first cation exchange resin tank 120.

[0051] In other examples, the raw water tank 110 can be directly connected to the first cation exchange resin tank 120. The first filter 190 can be connected to the inlet of the raw water tank 110. A first transfer pump 180 can be installed in other locations within the purification device, as long as the first transfer pump 180 can provide power for the flow of extracted water within the purification device.

[0052] The first cation exchange resin tank 120 includes a first tank body, which is generally prismatic or cylindrical, and contains a sulfonic acid-based cation exchange resin. The inlet of the first cation exchange resin tank 120 can be located at the top of the first tank body, or at a position on the upper side of the first tank body. The outlet of the first cation exchange resin tank 120 can be located at the bottom of the first tank body, or at a position on the lower side wall of the first tank body, facilitating the outflow of extracted water from the first cation exchange resin tank 120.

[0053] The cation exchange resin in the first tank is primarily used to remove cations from the extract water and reduce its conductivity. For example, the cation exchange resin in the first tank may include a sulfonic acid-based cation exchange resin, thereby improving its high-temperature resistance and the effectiveness of removing cations from the extract. In other examples, the cation exchange resin in the first tank may also include a carboxyl-based or a phenolic-based cation exchange resin. The type of cation exchange resin in the first tank can be set according to actual needs, as long as its corresponding function can be achieved.

[0054] The outlet of the first cation exchange resin tank 120 is connected to the first heat exchanger 130. The first heat exchanger 130 has a hot medium channel and a cold medium channel. The hot medium channel is for higher-temperature fluids, and the cold medium channel is for lower-temperature fluids. There may be one hot medium channel and one cold medium channel. Alternatively, there may be multiple hot medium channels and multiple cold medium channels, arranged alternately. Another option is to have one hot medium channel and two cold medium channels, with each cold medium channel adjacent to a hot medium channel. Yet another option is to have multiple hot medium channels and one cold medium channel, with each hot medium channel adjacent to a cold medium channel.

[0055] The heat medium passage and coolant passage of the first heat exchanger 130 are respectively connected to an inlet and an outlet. The outlet of the first cation exchange resin tank 120 is connected to the inlet of the heat medium passage of the first heat exchanger 130. The first heat exchanger 130 is used to cool the extraction water entering from the first cation exchange resin tank 120. For example, the first heat exchanger 130 can reduce the temperature of the extraction water entering from the first cation exchange resin tank 120 to a range of 45°C to 65°C. Optionally, the temperature of the extraction water flowing out of the first heat exchanger 130 is typically about 65°C.

[0056] The outlet of the heat medium channel of the first heat exchanger 130 is connected to the inlet of the heat medium channel of the second heat exchanger 140. The specific structure of the second heat exchanger 140 can be the same as or similar to that of the first heat exchanger 130, and will not be described in detail here. The refrigerant channel of the second heat exchanger 140 is used for circulating cooling water. When the temperature of the extract water flowing out of the first heat exchanger 130 is higher than a first threshold, the extract water flowing out of the first heat exchanger 130 will enter the heat medium channel of the second heat exchanger 140 for further cooling until the temperature of the extract water is lower than or equal to the first threshold. The specific temperature of the first threshold can be set according to actual needs. Optionally, the first threshold is less than or equal to 60°C. For example, the first threshold can be 60°C, 59°C, 58°C, 57°C, or 56°C, or any temperature between two of the above.

[0057] The outlet of the heat medium channel of the second heat exchanger 140 is connected to the inlet of the anion exchange resin tank 150. In this way, extraction water with a temperature lower than or equal to the first threshold enters the anion exchange resin tank 150, allowing the anions in the extraction process to exchange with the anions in the anion exchange resin tank 150. The inlet of the anion exchange resin tank 150 can be located at the top of the tank or at the upper part of the side of the tank. The outlet of the anion exchange resin tank 150 can be located at the bottom of the tank or at the lower part of the side wall of the tank, facilitating the outflow of extraction water from the anion exchange resin tank 150.

[0058] The outlet of the anion exchange resin tank 150 is connected to the inlet of the second cation exchange resin tank 160. This allows the cations in the extraction process flowing from the anion exchange resin tank 150 into the second cation exchange resin tank 160 to undergo ion exchange with the cations in the second cation exchange resin tank 160, ensuring the purification effect on the extracted water. The anion exchange resin tank 150 may be configured with anion exchange resin containing basic groups such as quaternary ammonium groups, amino groups, or imino groups.

[0059] The second cation exchange resin tank 160 includes a second tank body, which can be cylindrical or prismatic, and contains a sulfonic acid-based cation exchange resin. The inlet of the second cation exchange resin tank 160 can be located at the top of the second tank body, or at a higher position on the side of the second tank body. The outlet of the second cation exchange resin tank 160 can be located at the bottom of the second tank body, or at a lower position on the side wall of the second tank body, facilitating the flow of extracted water from the second cation exchange resin tank 160. The cation exchange resin in the second cation exchange resin tank 160 can be the same as or different from the cation exchange resin in the first cation exchange resin tank 120, depending on actual needs.

[0060] Optionally, the cation exchange resin in the second cation exchange resin tank 160 may be of the same type as the cation exchange resin in the first cation exchange resin tank 120, so that the first cation exchange resin tank 120 and the second cation exchange resin tank 160 can serve as backups for each other.

[0061] The outlet of the second cation exchange resin tank 160 is connected to the inlet of the refrigerant channel of the first heat exchanger 130, and the outlet of the refrigerant channel of the first heat exchanger 130 is connected to the finished product tank 170. In this way, the lower-temperature extraction water flowing out of the second cation exchange resin tank 160 can exchange heat with the higher-temperature extraction water flowing out of the first cation exchange resin tank 120 in the first heat exchanger 130, thereby saving energy and achieving economic efficiency. The temperature of the extraction water flowing out of the refrigerant channel of the first heat exchanger 130 can reach approximately 80°C.

[0062] The finished product tank 170 is used to store the purified extract water. A second transfer pump can be connected to the outlet of the finished product tank 170. The second transfer pump is used to transfer the extract water from the finished product tank 170 to the evaporation system. The outlet and inlet of the finished product tank 170 are located on opposite sides of the tank body.

[0063] The purification device provided in this embodiment removes cations from the extraction water using a first cation exchange resin tank 120, removes anions from the extraction water using anion exchange resin in anion exchange resin tank 150, and further removes cations from the extraction water using cation exchange resin in a second cation exchange resin tank 160, thereby achieving the purpose of removing inorganic ions from the extraction water and purifying it. Furthermore, by setting a first heat exchanger 130 and a second heat exchanger 140 between the first cation exchange resin tank 120 and the anion exchange resin, the first cation exchange resin tank 120 can adsorb at least some oligomers and cations in the extraction water, thus preventing the first heat exchanger 130 and the second heat exchanger 140 from clogging due to the final condensation of oligomers in the extraction water. Additionally, the extraction water entering the anion exchange resin tank 150 is below 60°C, preventing degradation of the anion exchange resin due to prolonged high-temperature operation, extending the regeneration cycle of the anion exchange resin, and improving its service life. Simultaneously, it extends the regeneration cycle of the cation exchange resin used for deodorization, thereby reducing wastewater discharge and the frequency of resin replacement. In addition, the lower-temperature extraction water flowing out of the second cation exchange resin tank 160 can exchange heat with the higher-temperature extraction water flowing out of the first cation exchange resin tank 120 in the first heat exchanger 130, thereby saving energy and being economical and efficient.

[0064] Please refer to Figure 1 and Figure 2 In some embodiments, the purification treatment device further includes: a first valve 201 connected to a second heat exchanger 140, used to adjust the flow rate of circulating cooling water in the refrigerant channel of the second heat exchanger 140 to ensure that the temperature of the extraction water flowing out of the heat medium channel of the second heat exchanger 140 is lower than a first threshold.

[0065] In some examples, the purification device further includes: a first temperature sensor 202 for detecting the outlet water temperature of the heat medium channel corresponding to the extraction water in the second heat exchanger 140; and a controller 203 electrically connected to the first valve 201 and the first temperature sensor 202, respectively, for controlling the first valve 201 to adjust the flow rate of the circulating cooling water in the second heat exchanger 140 based on the detection result of the first temperature sensor 202.

[0066] For example, when the controller 203 detects that the outlet water temperature of the heat medium channel of the second heat exchanger 140 is high based on the detection result of the first temperature sensor 202, it can control the opening degree of the first valve 201 to increase, thereby increasing the flow rate of circulating cooling water and improving the cooling effect on the extracted water in the heat medium channel. When the controller 203 detects that the outlet water temperature of the heat medium channel of the second heat exchanger 140 is close to the first threshold based on the detection result of the first temperature sensor 202, it can control the opening degree of the first valve 201 to decrease, which is beneficial for precise control of the temperature of the cooling water flowing out of the heat medium channel of the second heat exchanger 140.

[0067] In some examples, the purification device further includes a second valve 204 connected to the heat medium passage of the second heat exchanger 140. For example, the second valve 204 is connected to the outlet of the heat medium passage of the second heat exchanger 140. The second valve 204 is also electrically connected to a controller 203. The controller 203 is used to control the second valve 204 to open when the temperature detected by the first temperature sensor 202 is lower than or equal to a first threshold and equal to or higher than a second threshold, so that the extracted water can flow from the second heat exchanger 140 to the anion exchange resin tank 150; the second threshold is less than the first threshold.

[0068] It is understandable that the specific installation positions and structures of the first valve 201, the second valve 204, and the first temperature sensor 202 can be set according to actual needs, as long as the corresponding functions can be achieved.

[0069] Optionally, the second threshold is greater than or equal to 40°C, and the second threshold is less than or equal to 55°C. For example, the second threshold can be 40°C, 45°C, 50°C, or 55°C, or any temperature between two of these. For instance, when the temperature of the extraction water at the outlet of the heat medium channel of the second heat exchanger 140 is in the range of 40°C to 60°C, the controller 203 controls the second valve 204 to open, allowing the extraction water to flow from the second heat exchanger 140 to the anion exchange resin tank 150. As another example, when the temperature of the extraction water at the outlet of the heat medium channel of the second heat exchanger 140 is in the range of 50°C to 60°C, the controller 203 controls the second valve 204 to open, allowing the extraction water to flow from the second heat exchanger 140 to the anion exchange resin tank 150. For example, when the temperature of the extraction water at the outlet of the heat medium channel of the second heat exchanger 140 is in the range of 55°C to 60°C, the controller 203 controls the second valve 204 to open, so that the extraction water can flow from the second heat exchanger 140 to the anion exchange resin tank 150.

[0070] For anion exchange resins, the lower the temperature of the extraction water entering the anion exchange resin tank 150, the slower the thermal aging of the anion exchange resin. However, for the extraction water, excessively low temperatures can cause the precipitation of oligomers, which can contaminate the anion exchange resin, causing resin caking and aggregation. Furthermore, the extraction water exiting the ion exchange resin needs to be evaporated and recovered, requiring reheating. Lower-temperature extraction water consumes more energy to be heated.

[0071] Therefore, by setting the second threshold appropriately, it is possible to address the issues of thermal aging of anion exchange resins, improve the problem of resin caking and agglomeration caused by oligomer precipitation in extraction water due to excessively low temperatures, and also save energy.

[0072] Through the above settings, this embodiment can accurately control the temperature of the extraction water flowing out of the heat medium channel of the second heat exchanger 140 within a preset range, such as 40°C to 60°C, 50°C to 60°C, or 55°C to 60°C.

[0073] In some embodiments, a fifth valve and a sixth valve are respectively provided at the outlet and inlet of the heat medium passage of the first heat exchanger 130, a seventh valve and an eighth valve are respectively provided at the outlet and inlet of the refrigerant passage of the first heat exchanger 130, a ninth valve is provided at the outlet of the refrigerant passage of the second heat exchanger 140, and a tenth valve is provided at the inlet of the heat medium passage of the second heat exchanger 140. The above valves are electrically connected to the controller 203 to control the fluid entering and exiting the first heat exchanger 130 or the second heat exchanger 140.

[0074] In addition, a first pipeline is connected between the inlet and outlet of the heat medium channel of the first heat exchanger 130. The first pipeline is connected in parallel with the heat medium channel of the first heat exchanger 130, and a third valve 205 is installed in the first pipeline. The third valve 205 is electrically connected to the controller 203. Thus, when the first heat exchanger 130 is not required to cool the extraction water, for example, when the temperature difference between the extraction water flowing out of the first cation exchange resin tank 120 and a first threshold value is less than a preset difference, i.e., when the temperature of the extraction water flowing out of the first cation exchange resin tank 120 is close to the first threshold value, the controller 203 can control the third valve 205 to open and the fifth and sixth valves to close. This improves the flexibility of the purification treatment device in this embodiment, making it applicable to a wider range of purification scenarios. Specifically, when the first heat exchanger 130 is required to cool the extraction water, the controller 203 can control the third valve 205 to close and the fifth and sixth valves to open.

[0075] A second pipeline connects the inlet and outlet of the heat medium channel of the second heat exchanger 140. This second pipeline is connected in parallel with the heat medium channel of the second heat exchanger 140, and a fourth valve 206 is installed in the second pipeline. The fourth valve 206 is electrically connected to the controller 203. Thus, when the second heat exchanger 140 is not required to cool the extraction water, for example, when the temperature of the extraction water flowing out of the first heat exchanger 130 has decreased to less than or equal to a first threshold, the controller 203 can control the fourth valve 206 to open and the second valve 204 and the ninth valve to close. This improves the flexibility of the purification device in this embodiment, making it applicable to a wider range of purification scenarios. Specifically, when the second heat exchanger 140 is required to cool the extraction water, the controller 203 can control the fourth valve 206 to close and the second valve 204 and the ninth valve to open.

[0076] It is understood that, if necessary, this embodiment may also include a second temperature sensor, a third temperature sensor, etc., in the purification treatment device. For example, a second temperature sensor may be installed at the water outlet of the hot medium channel of the first heat exchanger 130, and a third temperature sensor may be installed at the water outlet of the cold medium channel of the second heat exchanger.

[0077] In some embodiments, backup devices are provided for the first cation exchange resin tank 120, the first heat exchanger 130, the second heat exchanger 140, the anion exchange resin tank 150, the second cation exchange resin tank 160, and the first transfer pump 180 in the purification treatment apparatus. Acid tanks are provided for the first cation exchange resin tank 120 and the second cation exchange resin tank 160 to facilitate the recycling and regeneration of the cation exchange resin; an alkali tank is provided for the anion exchange resin tank 150 to facilitate the recycling and regeneration of the anion exchange resin.

[0078] The first cation exchange resin tank 120, the first heat exchanger 130, the second heat exchanger 140, the anion exchange resin tank 150, the second cation exchange resin tank 160, and the first transfer pump 180 can be connected in parallel with their respective backup devices to facilitate switching control.

[0079] In this way, the first cation exchange resin tank 120, the anion exchange resin tank 150, or the second cation exchange resin tank 160 can be switched to the corresponding backup equipment, so that the ion exchange resin can be regenerated; the first heat exchanger 130 or the second heat exchanger 140 can be switched to the corresponding backup setting, which facilitates the cleaning or maintenance of the first heat exchanger 130 or the second heat exchanger 140; and the first transfer pump 180 can be switched to the corresponding backup setting, which facilitates the inspection or maintenance of the first transfer pump 180.

[0080] In addition, to reduce costs, the first cation exchange resin tank 120 and the second cation exchange resin tank 160 can correspond to a backup device, facilitating alternating regeneration of the first cation exchange resin tank 120 and the second cation exchange resin tank 160; of course, backup devices can also be configured for the first cation exchange resin tank 120 and the second cation exchange resin tank 160 respectively. The first heat exchanger 130 and the second heat exchanger 140 can correspond to a backup device, facilitating alternating cleaning of the first heat exchanger 130 and the second heat exchanger 140; of course, backup devices can also be configured for the first heat exchanger 130 and the second heat exchanger 140 respectively.

[0081] The implementation process of the purification treatment device provided in this embodiment is illustrated below. The temperature of the extraction water flowing from the raw water tank 110 to the first cation exchange resin tank 120 is about 85°C; the extraction water enters the first heat exchanger 130 from the first cation exchange resin tank 120 for cooling, and the temperature of the extraction water flowing out of the first heat exchanger 130 is about 65°C.

[0082] The extract water flowing out of the first heat exchanger 130 enters the second heat exchanger 140 for further cooling until the temperature of the extract water drops to 60°C. The extract water with the temperature reduced to 60°C is then transported to the anion exchange resin tank 150 for processing. The extract water flowing out of the anion exchange resin tank 150 enters the second cation exchange resin tank 160 for processing. The extract water flowing out of the second cation exchange resin tank 160 enters the first heat exchanger 130 for heating, so that the temperature of the extract water flowing out of the second cation exchange resin tank 160 is increased from 59°C to approximately 79°C. The heated extract water then enters the finished product tank 170 from the first set of heat exchangers.

[0083] The purification device provided in this embodiment, by setting up a first heat exchanger 130 and a second heat exchanger 140, can precisely control the temperature of the extraction water entering the anion exchange resin tank 150, avoiding the rapid degradation of the anion exchange resin, extending the regeneration cycle of the anion exchange resin, and also reducing the possibility that the trimethylamine odor caused by the degradation of the anion exchange resin will ultimately affect the working environment and workers' health in the spinning mill; at the same time, it also extends the regeneration cycle of the cation exchange resin in the second cation exchange resin tank 160, which serves as a deodorization unit, thereby reducing the discharge of wastewater and the frequency of resin replacement.

[0084] In this embodiment, the first heat exchanger 130 and the second heat exchanger 140 are arranged after the first cation exchange resin tank 120. Oligomers in the extraction water are adsorbed by the cation exchange resin in the first cation exchange resin tank 120. The extraction water exiting the first cation exchange resin tank 120 is then cooled, preventing oligomer blockage of the heat exchangers and ensuring continuous and stable operation of the device, thus extending the service life of the heat exchangers. In this embodiment, the extraction water requiring cooling in the first heat exchanger 130 is used as the hot side, and the extraction water requiring heating is used as the cold side, making it economical and efficient. This embodiment also provides precise flow control of the circulating cooling water in the second heat exchanger 140, facilitating precise control of the temperature of the extraction water exiting the second heat exchanger 140 and avoiding interference caused by temperature fluctuations, thereby ensuring process stability of the device.

[0085] In this embodiment, backup equipment is configured for the first cation exchange resin tank 120, the first heat exchanger 130, the second heat exchanger 140, the anion exchange resin tank 150, the second cation exchange resin tank 160, and the first transfer pump 180, ensuring the continuous operation of the device and guaranteeing the continuity and stability of production.

[0086] In some embodiments, the purification method based on the purification treatment apparatus in any embodiment may include the following steps:

[0087] Step S301: Transfer the extracted water to the raw water tank;

[0088] Step S302: The extracted water in the raw water tank is transported to the first cation exchange resin tank, so that the cation exchange resin in the first cation exchange resin tank adsorbs at least some of the oligomers and cations in the extracted water.

[0089] Step S303: The extraction water in the first cation exchange resin tank is transferred to the first heat exchanger for cooling.

[0090] Step S304: The extracted water cooled by the first heat exchanger is sent to the second heat exchanger for further cooling, so that the temperature of the extracted water flowing out of the second heat exchanger is lower than or equal to the first threshold; the first threshold is less than or equal to 60°C.

[0091] Step S305: The extracted water, cooled by the second heat exchanger, is transferred to the anion exchange resin tank.

[0092] Step S306: Transfer the extraction water in the anion exchange resin tank to the second cation exchange resin tank;

[0093] Step S307: The extraction water in the second cation exchange resin tank is transported to the first heat exchanger for heating treatment; wherein the extraction water entering the first heat exchanger from the second cation exchange resin tank can exchange heat with the extraction water entering the first heat exchanger from the first cation exchange resin tank.

[0094] Step S308: The extracted water, heated by the second cation exchange resin tank, is transferred to the finished product tank.

[0095] In step S304, the temperature of the extraction water flowing out of the second heat exchanger is equal to or higher than the second threshold; the second threshold is less than the first threshold; the second threshold is greater than or equal to 40°C, and the second threshold is less than or equal to 50°C.

[0096] In the description of the embodiments of this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0097] In the description of the embodiments of this disclosure, it should be understood that the terms "upper", "lower", "top", "bottom", "side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0098] In the description of embodiments of this disclosure, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0099] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0100] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements have been described above. Of course, these are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0101] The above description is merely an exemplary embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A purification treatment device, characterized in that, include: Raw water tank, used to contain extracted water; A first cation exchange resin tank is connected to the outlet of the raw water tank; the cation exchange resin in the first cation exchange resin tank is used to adsorb at least some of the oligomers and cations in the extracted water. The first heat exchanger has its inlet of the heat medium channel connected to the outlet of the first cation exchange resin tank, so as to cool the extracted water flowing out of the first cation exchange resin tank. The second heat exchanger has its inlet connected to the outlet of the heat medium channel of the first heat exchanger, so as to cool the extracted water entering the heat medium channel of the second heat exchanger, so that the temperature of the extracted water flowing out of the heat medium channel of the second heat exchanger is lower than or equal to a first threshold; the first threshold is less than or equal to 60°C. An anion exchange resin tank is connected to the outlet of the heat medium channel of the second heat exchanger; The second cation exchange resin tank is connected to the outlet of the anion exchange resin tank; the outlet of the second cation exchange resin tank is also connected to the inlet of the refrigerant channel of the first heat exchanger. The finished product tank is connected to the outlet of the refrigerant channel of the first heat exchanger.

2. The purification treatment device according to claim 1, characterized in that, Also includes: The first valve, connected to the second heat exchanger, is used to adjust the flow rate of circulating cooling water in the refrigerant passage of the second heat exchanger.

3. The purification treatment device according to claim 2, characterized in that, Also includes: The first temperature sensor is used to detect the outlet water temperature in the heat medium channel of the second heat exchanger; The controller is electrically connected to the first valve and the first temperature sensor respectively, so as to control the first valve to adjust the flow rate of circulating cooling water in the second heat exchanger according to the detection result of the first temperature sensor.

4. The purification treatment device according to claim 3, characterized in that, Also includes: The second valve is connected to the heat medium passage of the second heat exchanger and electrically connected to the controller, so that the controller can control the second valve to open when the temperature detected by the first temperature sensor is lower than or equal to a first threshold and equal to or higher than a second threshold, so that the extracted water can flow from the second heat exchanger to the anion exchange resin tank; the second threshold is less than the first threshold.

5. The purification treatment device according to claim 4, characterized in that, The second threshold is greater than or equal to 40°C, and the second threshold is less than or equal to 55°C.

6. The purification treatment device according to claim 3, characterized in that, Also includes: A first pipeline and a third valve are provided. The first pipeline is connected in parallel with the heat medium passage of the first heat exchanger. The third valve is located in the first pipeline and is electrically connected to the controller.

7. The purification treatment device according to claim 3, characterized in that, The second pipeline and the fourth valve are provided. The second pipeline is connected in parallel with the heat medium passage of the second heat exchanger. The fourth valve is provided in the second pipeline and is electrically connected to the controller.

8. The purification treatment device according to claim 1, characterized in that, The first cation exchange resin tank includes a first tank body, in which sulfonic acid-based cation exchange resin is contained; The second cation exchange resin tank includes a second tank body containing a sulfonic acid-based cation exchange resin.

9. The purification treatment device according to claim 1, characterized in that, The purification treatment device further includes: A first delivery pump is connected between the raw water tank and the first cation exchange resin tank; A first filter is connected between the first delivery pump and the first cation exchange resin tank.

10. The purification treatment apparatus according to claim 1, characterized in that, Backup devices are provided for the first cation exchange resin tank, the first heat exchanger, the second heat exchanger, the anion exchange resin tank, and the second cation exchange resin tank, respectively. An acid tank is provided for the first cation exchange resin tank and the second cation exchange resin tank. An alkali tank is provided for the anion exchange resin tank.

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