A high-efficiency membrane treatment device for reactive dyes

Abstract

This utility model discloses a high-efficiency membrane treatment device for reactive dyes, including a feed pump, a bag filter, a booster pump, and a membrane module. The feed pump is connected to the bag filter via a pipeline, the bag filter is connected to the booster pump via a pipeline, and the booster pump is connected to the membrane module via a main pipeline. The circulation pump is connected to the guide pipe via a multi-port pipe, and the guide pipe is connected to the main pipeline via a circulation pipe. This utility model uses a circulation system linked with the membrane module. The circulation pump introduces part of the liquid into the guide pipe, where it is swirled and cut by the spiral blades before being tangentially injected into the main pipeline through the circulation pipe to form a spiral flow field. This generates shear force and, combined with the flow rate, flushes the membrane, achieving real-time removal of impurities without shutting down the system. Combined with a differential pressure sensor and a three-way valve for dynamic flow regulation, it can promptly clear blocked channels, reduce membrane wear and contamination, extend membrane life, reduce downtime and membrane replacement costs, and ensure continuous treatment of reactive dyes.

Description

Technical Field

[0001] This utility model mainly relates to the field of dye equipment technology, specifically a high-efficiency membrane treatment device for reactive dyes. Background Technology

[0002] Digital inkjet printing is an important process for the application of reactive dyes in recent years. Compared with traditional printing processes, reactive dye digital inkjet printing technology combines the precision of digital inkjet printing with the excellent performance of reactive dyes, offering advantages such as high precision and color performance, environmental friendliness and energy saving, flexibility and efficiency, excellent fastness and hand feel, and low cost. In digital inkjet printing, reactive dyes need to have high solubility, low conductivity, and good stability.

[0003] After reactive dyes are prepared, the dye solution typically contains small amounts of residual intermediates, small-molecule byproducts, and inorganic salts. The presence of these substances reduces the purity and content of the dye, and also affects its solubility and color, among other physical properties. If the dye solution is directly spray-dried without further treatment, the resulting dye product will likely fail to meet the requirements of inkjet printing.

[0004] Currently, reactive dyes used in inkjet printing typically require membrane treatment to remove small amounts of intermediates, byproducts, and inorganic salts remaining from the dye production process. With prolonged use, traditional membrane treatment devices experience the retention and deposition of impurities in the dye solution within the membrane channels. This leads to a significant decrease in both the flow rate and stability of the membrane channels, as well as a significant increase in the pressure within the channels, ultimately reducing the membrane's lifespan. Utility Model Content

[0005] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. It mainly provides a high-efficiency membrane treatment device for reactive dyes, which solves the technical problems mentioned in the background art, such as reduced membrane throughput, increased pressure, and short lifespan caused by impurity deposition in traditional devices for reactive dye membrane treatment in inkjet printing.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A high-efficiency membrane treatment device for reactive dyes includes a feed pump, a bag filter, a booster pump, and a membrane module. The feed pump is connected to the bag filter via a pipeline, the bag filter is connected to the booster pump via a pipeline, and the booster pump is connected to the membrane module via a main pipeline. The circulation pump is connected to a guide pipe via a multi-port pipe, and the guide pipe is connected to the main pipeline via a circulation pipe.

[0007] More preferably, the end of the circulation pipe is provided with a horn-shaped stainless steel mesh cover, the conical flare of which faces the central axis of the main pipe.

[0008] More preferably, the circulation pipe injects into the main pipe at an angle of 15° to 20°.

[0009] More preferably, the guide pipe is provided with titanium alloy spiral blades inside, and titanium alloy limiting grids are provided at both ends of the blades.

[0010] More preferably, the bottom of the feed pump is provided with a base plate, and the base plate is provided with a bag filter, a booster pump, a support frame and a mounting frame, the membrane module is mounted on the support frame; the circulation pump is mounted on the mounting frame.

[0011] More preferably, the membrane module is connected to a permeate pipe and a concentrate pipe. The permeate pipe is connected to a drain pipe and a circulation pump via a three-way valve. The drain pipe is used to discharge the permeate produced after filtration by the membrane module. The permeate pipe is connected to the inlet of the circulation pump via a three-way valve. The three-way valve is controlled to open and close by a differential pressure sensor.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This high-efficiency membrane treatment device achieves continuous membrane cleaning through the linkage design of the circulation system and membrane modules: the circulation pump introduces part of the permeate or concentrate into the guide pipe, and after being cut by the titanium alloy spiral blades, it is injected into the main pipe at a specific angle through the circulation pipe. The spiral flow field generated by this creates a continuous shearing force, which can strip away the deposited impurities in the membrane inlet and channel in real time. Combined with the flushing effect brought about by the increase in the flow rate inside the membrane, the impurities can be removed during the normal operation of the device without stopping production. Meanwhile, the dynamic control mechanism of the differential pressure sensor and the three-way valve can quickly adjust the circulation flow when the membrane module pressure is abnormal, promptly clear blockage channels, and avoid membrane damage caused by long-term impurity deposition; it reduces the physical loss and chemical pollution of the membrane, extends the service life of the membrane module, and reduces the efficiency loss and cost investment caused by downtime for cleaning or replacing the membrane module, providing an efficient and reliable guarantee for the continuous membrane treatment of reactive dyes.

[0013] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view of the structure of this utility model.

[0015] Numbering on the map: 1. Base plate; 2. Feed pump; 3. Bag filter; 4. Booster pump; 5. Support frame; 6. Membrane module; 7. Mounting frame; 8. Main pipeline; 9. Permeate pipe; 10. Concentrate pipe; 11. Circulation pump; 12. Guide pipe; 13. Circulation pipe. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Please refer to the appendix carefully. Figure 1-2 A high-efficiency membrane treatment device for reactive dyes includes a feed pump 2, a bag filter 3, a booster pump 4, and a membrane module 6. The feed pump 2 is connected to the bag filter 3 through a pipe, the bag filter 3 is connected to the booster pump 4 through a pipe, and the booster pump 4 is connected to the membrane module 6 through a main pipe 8. A circulation pump 11 is connected to a guide pipe 12 through a multi-port pipe, and the guide pipe 12 is connected to the main pipe 8 through a circulation pipe 13.

[0019] In this embodiment, as Figure 1 and Figure 2 As shown, a horn-shaped stainless steel mesh cover is provided inside the end of the circulation pipe 13. Its conical flare faces the central axis of the main pipe 8. The opening ratio of the horn-shaped stainless steel mesh cover is 70%, the aperture is 0.5mm, and the mesh cover is placed inside the end of the circulation pipe 13 and extends into the main pipe 8 by about 5mm. The conical flare faces the central axis of the main pipe 8, which can guide the circulating liquid to be injected along the mainstream direction of the main pipe 8, reduce the interference with the flow of the solution in the main pipe 8, and avoid energy loss caused by local eddies.

[0020] In this embodiment, as Figure 1 and Figure 2As shown, the circulation pipe 13 injects tangentially into the main pipe 8 at an angle of 15° to 20°. This tangential injection method allows the circulating liquid to enter along the tangential direction of the inner wall of the main pipe 8, forming a spiral composite flow field with the mainstream solution in the main pipe 8. The 15° to 20° angle design avoids both the surge in flow resistance caused by an excessively small angle and the insufficient swirling intensity caused by an excessively large angle. This allows for the formation of a stable rotational shear force within the main pipe 8, which can effectively strip away tiny impurities adhering to the inner wall of the pipe and at the inlet of the subsequent membrane module 6, reducing the probability of impurity deposition.

[0021] In this embodiment, as Figure 1 and Figure 2 As shown, the guide pipe 12 is equipped with titanium alloy helical blades, and titanium alloy limiting grids are provided at both ends of the blades. The helix angle of the titanium alloy helical blades is 60°, the number of blades is 3, and the thickness is 0.8mm. The surface of the titanium alloy helical blades is coated with a polytetrafluoroethylene anti-stick coating. The 60° helix angle helical blades can form a strong swirling cutting effect on the circulating liquid passing through the guide pipe 12. Combined with the symmetrical distribution of the 3 blades, the circulating liquid can be dispersed into multiple helical branches, which can significantly improve the fluid turbulence. This high turbulence state can fully disperse residual dyes and impurities in the circulating liquid, avoid local agglomeration, and lay a uniform foundation for subsequent mixing with the solution in the main pipe 8. The 0.8mm blade thickness ensures structural strength while reducing fluid resistance loss and ensuring efficient transmission of circulation power.

[0022] In this embodiment, as Figure 1 and Figure 2 As shown, the bottom of the feed pump 2 is provided with a base plate 1, on which a bag filter 3, a booster pump 4, a support frame 5 and a mounting frame 7 are provided. Multiple membrane modules 6 are equidistantly installed on the support frame 5; the circulation pump 11 is installed on the mounting frame 7; the multiple membrane modules 6 are equidistantly installed, which can simultaneously divert the dye solution after filtration by the bag filter 3 and pressurization by the booster pump 4, greatly increasing the dye purification amount per unit time and meeting the needs of large-scale reactive dye production.

[0023] In this embodiment, as Figure 1 and Figure 2 As shown, the membrane module 6 is connected to a permeate pipe 9 and a concentrate pipe 10. The permeate pipe 9 is connected to the drain pipe and the circulation pump 11 via a three-way valve (an electric three-way ball valve, model Q911F-16P). The drain pipe is used to discharge the permeate produced after filtration by the membrane module 6. The permeate pipe 9 is connected to the inlet of the circulation pump 11 via a three-way valve. The three-way valve is controlled to open and close by a differential pressure sensor.

[0024] While equidistant installation of multiple membrane modules 6 can initially ensure uniform flow, pressure imbalance may occur due to differences in membrane fouling levels during long-term operation. Differential pressure sensors monitor the internal and external pressure difference of each membrane module 6 in real time. When the pressure difference of a module exceeds the threshold, the permeate circulation rate of that module is adjusted through a three-way valve (e.g., increasing reflux and reducing discharge) to quickly balance its membrane surface pressure. Furthermore, a portion of the permeate can be injected into the main pipeline 8 through the circulation pump 11. By increasing the flow rate of the dye solution in the membrane pathway, residual impurities in the membrane channels are flushed out, maintaining the high efficiency of the membrane channels. As the residual impurities are pushed out and flow with the dye solution, the blocked channels inside the membrane open, the internal pressure of the membrane decreases and remains stable, effectively extending the service life of the membrane.

[0025] Booster pump 4 and circulation pump 11 are connected to a PLC controller. The PLC receives signals from flow sensor 14 in the main pipeline 8 to monitor the flow rate in the main pipeline 8. In another embodiment, no three-way valve is installed at the permeate pipe 9; it is only connected to the drain pipe. The three-way valve is connected to the concentrate pipe 10. The concentrate pipe 10 is connected to the drain pipe and the circulation pump 11 through the three-way valve. The circulation pump 11 can inject part of the concentrate into the main pipe 8. By increasing the flow rate of the dye solution in the membrane passage, it promotes the flushing out of the residual impurities in the membrane channel, thus maintaining the high efficiency of the membrane channel.

[0026] The specific operating procedure of this utility model is as follows: The reactive dye solution to be treated is first drawn by the feed pump 2 and transported through pipeline to the bag filter 3. Preliminary filtration removes large particulate impurities from the solution, providing pretreatment for subsequent fine filtration by the membrane module 6. The filtered solution then enters the booster pump 4 through pipeline. Under the action of the booster pump 4, sufficient pressure is obtained, and the solution is transported through the main pipeline 8 to multiple membrane modules 6 equidistantly installed on the support frame 5, achieving large-scale diversion processing. Within membrane module 6, small-molecule pure dye (permeate) in the dye solution passes through the filter membrane into permeate tube 9, while concentrated solution containing residual intermediates, inorganic salts, and other impurities enters concentrated solution tube 10. Permeate tube 9 achieves bidirectional flow diversion via a three-way valve: when the pressure difference between the inside and outside of membrane module 6 is within the normal range (monitored by a differential pressure sensor), the three-way valve opens the drain pipe, and the qualified permeate is directly discharged and collected; when the pressure difference of a membrane module 6 exceeds the threshold due to impurities clogging, the differential pressure sensor triggers the three-way valve to switch to the inlet passage of the circulation pump 11, and part of the permeate is introduced into the circulation system for reprocessing. In the circulation system, the circulation pump 11 delivers the returned permeate (or concentrate-side circulation liquid) to the corresponding guide pipe 12 through a multi-port pipe. Inside the guide pipe 12, titanium alloy spiral blades (60° helix angle, 3 blades, 0.8mm thickness) strongly swirl and cut the circulation liquid, dispersing it into multiple spiral branches. Limiting grids at both ends of the blades ensure stable blade operation. The swirling circulation liquid forms a highly turbulent state within the guide pipe 12, fully dispersing residual dye and impurities, and is then injected into the main pipeline 8 through the circulation pipe 13. The horn-shaped stainless steel mesh cover (70% opening rate, 0.5mm aperture) at the end of the circulation pipe 13 extends into the main pipe 8 by about 5mm. Its conical flare faces the central axis of the main pipe 8, guiding the circulating liquid to be injected along the mainstream direction. The circulation pipe 13 is injected tangentially into the main pipe 8 at an angle of 15°~20°, forming a spiral composite flow field with the mainstream solution in the main pipe 8, generating a stable rotational shear force, peeling off the tiny impurities on the inner wall of the pipe and at the inlet of the membrane module 6, and reducing the probability of deposition. Through the above process, the circulating liquid is fully mixed with the new solution in the main pipeline 8 and then re-enters the membrane module 6. This increases the solution flow rate in the membrane passage, promotes the flushing out of residual impurities in the membrane channel with the fluid, opens the blocked channel, and dynamically balances the pressure of each membrane module 6 through the linkage control of the differential pressure sensor and the three-way valve, ensuring stable pressure inside the membrane. Ultimately, this achieves efficient purification of reactive dyes and extends the service life of the membrane module 6. The entire device integrates and fixes equipment such as feed pump 2, bag filter 3, and booster pump 4 through the base plate 1. Together with the circulation pump 11 on the mounting frame 7 and the multi-membrane module 6 on the support frame 5, it forms a coordinated and efficient continuous processing system to meet the needs of large-scale reactive dye production.

[0027] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A high-efficiency membrane treatment device for reactive dyes, comprising a feed pump (2), a bag filter (3), a booster pump (4), and a membrane module (6), characterized in that: The feed pump (2) is connected to the bag filter (3) through a pipe, the bag filter (3) is connected to the booster pump (4) through a pipe, and the booster pump (4) is connected to the membrane module (6) through the main pipe (8). The circulating pump (11) is connected to the guide pipe (12) through a multi-port pipe, and the guide pipe (12) is connected to the main pipe (8) through the circulating pipe (13); The end of the circulation pipe (13) is provided with a horn-shaped stainless steel mesh cover, and its conical flare faces the central axis of the main pipe (8). The membrane module (6) is connected to a permeate pipe (9) and a concentrate pipe (10). The permeate pipe (9) is connected to the drain pipe and the circulation pump (11) through a three-way valve. The drain pipe is used to discharge the permeate produced after filtration by the membrane module (6). The permeate pipe (9) is connected to the inlet of the circulation pump (11) through a three-way valve. The three-way valve is controlled to open and close by a differential pressure sensor.

2. The high-efficiency membrane treatment device for reactive dyes according to claim 1, characterized in that: The circulation pipe (13) is injected tangentially into the main pipe (8) at an angle of 15° to 20°.

3. The high-efficiency membrane treatment device for reactive dyes according to claim 1, characterized in that: The guide pipe (12) is equipped with titanium alloy spiral blades inside, and titanium alloy limiting grids are provided at both ends of the blades.

4. The high-efficiency membrane treatment device for reactive dyes according to claim 1, characterized in that: The bottom of the feed pump (2) is provided with a base plate (1), on which a bag filter (3), a booster pump (4), a support frame (5) and a mounting frame (7) are provided. The membrane module (6) is mounted on the support frame (5); the circulation pump (11) is mounted on the mounting frame (7).

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