Process device for preparing high-quality brine by using ultrafiltration membrane

Abstract

The application relates to the technical field of aeration equipment, in particular to a process device for preparing high-quality brine by using ultrafiltration membranes, which comprises an aeration disc body and an aeration assembly. A connecting cavity, a transition cavity and a ventilation cavity are sequentially arranged in the aeration disc body, the ventilation cavity is located at the center of the aeration disc body, a ventilation hole is arranged at the bottom surface of the aeration disc body, the ventilation hole is communicated with the ventilation cavity, the aeration assembly comprises an aeration pipe, a supporting block and a reset element, the sliding part of the aeration pipe is arranged in the connecting cavity, the aeration pipe extends into the transition cavity, the supporting block is fixedly connected with the aeration pipe, one end of the reset element is fixedly connected with the aeration disc body, and the other end of the reset element is fixedly connected with the connecting block. A plurality of aeration holes are arranged on the side wall of the aeration pipe. The aeration pipe is arranged in a sliding mode, can automatically extend and retract under the action of airflow, and dynamically adjusts the aeration position. The aeration holes are arranged on the side surface of the aeration pipe, so that the deposited substances can effectively prevent the aeration holes from being rapidly covered after aeration.

Description

Technical Field

[0001] This invention relates to the field of aeration equipment technology, and in particular to a process apparatus for preparing high-quality brine using an ultrafiltration membrane. Background Technology

[0002] Brine purification is a crucial process in the salt industry for improving the purity of refined salt products, reducing impurities, and increasing whiteness. Salt mud is used by salt producers to remove calcium from brine during production. 2+ Mg 2+ Solid waste generated during pretreatment. Salt mud contains calcium carbonate, magnesium hydroxide, calcium sulfate, and sodium chloride, etc. Due to its large output and complex composition, direct discharge causes environmental pollution. How to improve solid-liquid separation efficiency and improve the quality of refined brine is a difficult problem for the industry.

[0003] In the production of chlor-alkali and soda ash chemicals, solid salt is used to produce crude brine, which generates a large amount of salt mud during primary and secondary purification processes. Salt mud is a complex, viscous, and easily caking solid waste, and its treatment is a challenge in the industry. Plate membrane filtration technology, due to its advantages such as high filtration accuracy and high degree of automation, is gradually being applied to the dewatering and washing process of salt mud.

[0004] In a plate membrane filtration system, the aeration device is one of the core components. Its function is to release a large number of microbubbles at the bottom of the membrane plate, generating intense turbulence and shear force to continuously flush the membrane surface, thereby effectively preventing salt mud particles from depositing and adhering to the membrane surface, alleviating membrane fouling, and maintaining a stable filtration flux of the system.

[0005] Currently, plate membrane aeration devices used for salt mud filtration mostly employ fixed aeration pipes or aeration discs. These devices typically have aeration holes directly connected to fixed pipes or discs. In actual operation, high-viscosity salt mud easily backflows into the aeration holes during aeration intervals or when air pressure is unstable, depositing and hardening there. Over time, this solidified salt mud gradually clogs the aeration holes, leading to reduced aeration area, uneven bubble distribution, and a significant decrease in scouring effect.

[0006] Once the aeration holes become clogged, membrane fouling in the system worsens, and filtration efficiency drops sharply. To restore system performance, it is necessary to shut down the system for cleaning. Cleaning these internally clogged aeration structures is very difficult, often requiring the entire aeration unit to be disassembled from the filter for physical unclogging or chemical soaking. The entire process is time-consuming and labor-intensive, severely impacting the continuity and economy of production.

[0007] Furthermore, in salt mud filtration environments, aeration devices often come into contact with saturated brine or brines. These fluids are highly susceptible to reduced flow area at and near the aeration orifices due to water evaporation and solute crystallization, resulting in a phenomenon known as "aeration attenuation." Summary of the Invention

[0008] The technical problem to be solved by the present invention is: in order to overcome the problem in the prior art that when the aeration holes are located on the top surface, the sediment will quickly cover the aeration holes after aeration is stopped, and the gas will have difficulty breaking through the sediment layer when restarting, which seriously affects the normal operation, a process device for preparing high-quality brine by ultrafiltration membrane is provided.

[0009] This patented aeration device reduces the operating cost of brine purification and improves its efficiency. On the other hand, it solves the problems of solid-liquid separation and salt mud sedimentation in the salt industry, saving on shutdown and cleaning costs and enabling the recycling of salt mud resources. It has great potential for widespread application.

[0010] The technical solution adopted by this invention to solve its technical problem is: a process device for preparing high-quality brine using ultrafiltration membrane, comprising an aeration disc body and an aeration assembly. The aeration disc body has a connecting cavity, a transition cavity, and a ventilation cavity that are sequentially connected. The opening of the connecting cavity extends to the outer peripheral wall of the aeration disc body. The ventilation cavity is located at the center of the aeration disc body. Ventilation holes are provided on the bottom surface of the aeration disc body, and the ventilation holes and the ventilation cavity are connected. The aeration assembly includes an aeration pipe, a support block, and a reset element. The sliding part of the aeration pipe is in the connecting cavity, and the aeration pipe extends into the transition cavity. The support block is located in the transition cavity and is fixedly connected to the aeration pipe. One end of the reset element is fixedly connected to the aeration disc body, and the other end is fixedly connected to the connecting block. Several aeration holes are opened on the side wall of the aeration pipe. The end of the aeration pipe near the outside is a closed end, and the end of the aeration pipe inside the aeration disc is an open end. The inner cavity of the aeration pipe is connected to the transition cavity. The aeration pipe, which is slidably set, can automatically extend and retract under the action of airflow, dynamically adjust the aeration position, expand the aeration range, and improve the uniformity and efficiency of aeration. Opening the aeration holes on the side of the aeration pipe can effectively prevent the sediment from quickly covering the aeration holes after aeration. Initially, the aeration pipe is located inside the aeration disc.

[0011] To address potential jamming or instability issues during the sliding of the aeration pipe, a sliding connection between the support block and the transition cavity wall is further included.

[0012] To address the corrosion or blockage caused by internal liquid or fluid accumulation when the aeration pipe retracts, a further improvement is made by providing a discharge hole on the bottom surface of the aeration pipe to discharge any small amount of fluid that enters during the aeration pipe's recovery process.

[0013] To address the issue of ensuring effective drainage from the discharge port, the spacing between the discharge port and the closed end of the aeration pipe is further reduced to the spacing between the closed end of the aeration pipe and its nearest aeration port.

[0014] To address the issue of fluid depositing inside the aeration disc after entering the aeration pipe, a flow-limiting block is further included inside the aeration pipe. The flow-limiting block has a limiting surface that slopes downward from the center of the aeration disc body to its periphery, and the discharge hole is located between the closed end of the aeration pipe and the flow-limiting block.

[0015] To address the issue of fixed installation direction of the aeration disc, a connecting component is further included on the bottom surface of the aeration disc. The connecting component includes a connecting pipe and a rotating pipe. The connecting pipe is fixedly connected to the bottom surface of the aeration disc body, the connecting pipe is connected to the air vent, the connecting pipe is rotatably connected to the rotating pipe, and the connecting pipe and the rotating pipe are connected.

[0016] The beneficial effects of the present invention are: The present invention provides a process device for preparing high-quality brine by ultrafiltration membrane. The aeration tube is slidably set and can automatically extend and retract under the action of airflow, dynamically adjust the aeration position, expand the aeration range, improve the aeration uniformity and efficiency, and open the aeration holes on the side of the aeration tube to effectively prevent the sediment from quickly covering the aeration holes after aeration. The telescopic mechanism can effectively cope with the aeration attenuation phenomenon in saturated brine or salt water environments. It protects the aeration holes by retracting when aeration stops and cleans the holes by airflow and displacement when restarting, thus maintaining long-term stable aeration performance. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the aeration discs arranged in the salt mud filtration device of the present invention. Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a cross-sectional structural schematic diagram of the present invention; Figure 4 This is the present invention. Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 5 This is the present invention. Figure 4 A magnified structural diagram at point B in the middle.

[0019] In the diagram: 1. Aeration disc body, 11. Connecting cavity, 12. Transition cavity, 13. Ventilation cavity, 14. Ventilation hole, 2. Aeration component, 21. Aeration pipe, 211. Aeration hole, 212. Discharge hole, 22. Support block, 23. Reset element, 24. Flow limiting block, 241. Limiting surface, 3. Connecting component, 31. Connecting pipe, 32. Rotating pipe. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0021] like Figure 1 This is a schematic diagram of the structure of the present invention. A process device for preparing high-quality brine using an ultrafiltration membrane includes an aeration disc body 1 and an aeration component 2. The aeration disc body 1 has a connecting cavity 11, a transition cavity 12 and a ventilation cavity 13 connected in sequence. The opening of the connecting cavity 11 extends to the outer peripheral wall of the aeration disc body 1. The ventilation cavity 13 is located at the center of the aeration disc body 1. The bottom surface of the aeration disc body 1 has a ventilation hole 14, which is connected to the ventilation cavity 13.

[0022] like Figure 2 , 3 As shown in Figure 4, the aeration assembly 2 includes an aeration pipe 21, a support block 22, and a reset element 23. The reset element 23 can be a spring or a pneumatic rod, etc. The sliding part of the aeration pipe 21 is in the connecting cavity 11, and the aeration pipe 21 extends into the transition cavity 12. The support block 22 is located in the transition cavity 12, and the support block 22 and the aeration pipe 21 are fixedly connected. One end of the reset element 23 is fixedly connected to the aeration disc body 1, and the other end is fixedly connected to the connecting block. Several aeration holes 211 are opened on the side wall of the aeration pipe 21. The end of the aeration pipe 21 near the outside is a closed end, and the end of the aeration pipe 21 inside the aeration disc is an open end. The inner cavity and transition cavity 12 are connected. The aeration pipe 21, which is slidably set, can automatically extend and retract under the action of airflow, dynamically adjusting the aeration position, expanding the aeration range, and improving the uniformity and efficiency of aeration. The aeration holes 211 are opened on the side of the aeration pipe, which can effectively prevent the sediment from quickly covering the aeration holes after aeration. The reset element 23 ensures that the aeration pipe 21 automatically retracts into the aeration disc body 1 when there is no airflow, reducing the accumulation of sediment. At the same time, the unique discharge hole design can effectively discharge the liquid accumulated in the pipe by using higher gas pressure in the initial stage of aeration, and automatically transforms into an auxiliary exhaust hole in the normal aeration stage, increasing the aeration points and improving the aeration efficiency.

[0023] In the initial state, the aeration pipe 21 is located inside the aeration disc body 1.

[0024] The support block 22 and the transition cavity 12 are slidably connected, and the slidable connection between the support block 22 and the transition cavity 12 ensures the smoothness of the movement of the aeration pipe 21.

[0025] like Figure 2 , 3As shown in Figure 4, a discharge hole 212 is provided on the bottom surface of the aeration pipe 21. The discharge hole 212 is used to discharge the small amount of fluid that enters the aeration pipe 21 during recycling. The distance between the discharge hole 212 and the closed end of the aeration pipe 21 is smaller than the distance between the closed end of the aeration pipe 21 and its nearest aeration hole 211. In the initial stage of aeration, the discharge hole 212 effectively discharges the liquid accumulated in the aeration pipe 21 using a higher gas pressure, and automatically transforms into an auxiliary exhaust hole in the normal aeration stage, increasing the aeration points and improving the aeration efficiency.

[0026] like Figure 2 , 3 As shown in Figure 4, a flow limiting block 24 is arranged inside the aeration pipe 21. The limiting block has a limiting surface 241 that slopes downward from the center of the aeration disc body 1 to its periphery. The discharge hole 212 is located between the closed end of the aeration pipe 21 and the flow limiting block 24. The flow limiting block 24 and its limiting surface 241 guide and restrict the flow of fluid, preventing the fluid from entering the transition cavity 12 of the aeration disc body 1.

[0027] A connecting component 3 is arranged on the bottom surface of the aeration disc. The connecting component 3 includes a connecting pipe 31 and a rotating pipe 32. The connecting pipe 31 is fixedly connected to the bottom surface of the aeration disc body 1. The connecting pipe 31 is connected to the air hole 14. The connecting pipe 31 and the rotating pipe 32 are rotatably connected. The rotating pipe 32 rotates relative to the connecting pipe 31, which facilitates the installation and adjustment of the aeration direction. During the aeration process, it can be affected by the exhaust airflow to generate rotation (micro-rotation is also possible), which improves the uniformity of aeration.

[0028] Continuous aeration working process: During operation, the aeration disc body 1 is connected to the external air supply system through the bottom connecting component 3. Gas enters the ventilation chamber 13 from the ventilation hole 14, flows through the transition chamber 12 in sequence, and finally enters the aeration pipe 21. The gas pressure pushes the aeration pipe 21 to slide outward along the connecting chamber 11 and extend out of the aeration disc body 1. At the same time, the support block 22 slides in the transition chamber 12 and the reset element 23 is compressed. In the initial stage of aeration startup, the gas pressure is rapidly established. At this time, the gas is mainly released from the path of least resistance. Since the discharge hole 212 is short from the opening of the connecting cavity 11 of the aeration disc body 1, a small amount of fluid (such as brine or mud) that enters and accumulates at the bottom of the aeration pipe 21 during recycling is quickly discharged from the discharge hole 212 by the initial high-pressure gas, achieving rapid emptying and avoiding repeated accumulation. After entering the normal aeration stage, the liquid accumulated in the aeration pipe 21 has been cleared, and the gas is discharged from the aeration hole 211 on the side wall and the discharge hole 212 at the bottom. The function of the discharge hole 212 changes from drainage to auxiliary exhaust, which increases the aeration points and improves the overall aeration efficiency. When the gas supply stops, the reset element 23 releases its elastic force, pushing the support block 22 and the aeration pipe 21 back into the aeration disc body 1. During the retraction process, the limiting surface 241 of the flow limiting block 24 can guide the possible trace fluid to gather towards the discharge hole 212, preparing for smooth discharge when it starts up again. The rotating pipe 32 of the connecting component 3 can rotate relative to the connecting pipe 31, allowing the aeration disc to adjust its direction and adapt to the flow changes in the salt mud filtration device. When the air supply is stopped, the reset element 23 pushes the aeration pipe 21 to retract into the aeration disc body 1, so that the aeration hole 211 leaves the high crystallization risk filtration environment, reducing the contact time between the hole and the saturated fluid, thereby inhibiting the formation of crystals and deposits. When the air supply is restarted, the airflow impact combined with the physical displacement of the aeration pipe 21 from the retracted state to the outward can effectively destroy or peel off the slight crystal or deposit layer that may form at the aeration hole 211 during the intermittent period, restoring and maintaining good ventilation effect.

[0029] Intermittent aeration process: During operation, the aeration disc body 1 is connected to the external air supply system via the bottom connecting component 3. By adjusting the air volume of the air supply system, it is controlled to a level where the initial pressure of the gas entering the ventilation chamber 13 and flowing through the transition chamber 12 is insufficient to immediately overcome the elastic force of the reset element 23 and push out the aeration pipe 21. Instead, pressure needs to gradually accumulate in the ventilation chamber 13 and the inner cavity of the aeration pipe 21.

[0030] When the gas pressure accumulates to a level sufficient to overcome the elastic force of the reset element 23, the aeration pipe 21 is rapidly pushed out, sliding outward from the aeration disc body 1. At this instant, the accumulated high-pressure gas is concentrated and ejected at high speed mainly from the discharge hole 212 with lower resistance and the aeration holes 211 on the side wall, forming a strong pulse airflow. This airflow can effectively break through any salt mud scale or crystal blockage that may exist inside or outside the aeration holes 211, solving the problem of "aeration attenuation".

[0031] After the aeration pipe 21 extends, the pressure inside the system drops because the gas passage has been opened. At this time, if the continuous air supply is still less than the airflow threshold required to maintain the extended state of the aeration pipe 21 (this threshold is higher than the instantaneous impact force threshold for pushing it out due to the pre-tightening force of the reset element), the aeration pipe 21 will begin to retract under the action of the reset element 23. The retraction action will change the volume and pressure of the internal cavity, which may help to disturb the flow field and cause the main aeration holes 211 to retract into the aeration disc body 1, reducing contact with the fluid with a high crystallization tendency.

[0032] As gas continues to be introduced, pressure begins to build up again, repeating the above process. This forms a periodic intermittent aeration cycle of pressure accumulation, instantaneous release and pulse aeration, pressure release and retraction. The intermittent pulse aeration mode not only maintains the patency of the aeration holes through high-pressure pulses, but its unique "alternating dynamic and static" process, compared to continuous aeration, can effectively clean the membrane surface while generating more complex flow field changes, which helps prevent the regular deposition of salt mud and may reduce overall energy consumption.

[0033] When the gas supply is completely stopped, the reset element 23 will push the aeration pipe 21 to retract completely into the aeration disc body 1, thus achieving maximum protection.

[0034] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A process apparatus for preparing high-quality brine using ultrafiltration membranes, characterized in that, The aeration disc body (1) and the aeration assembly (2) are included. The aeration disc body (1) has a connecting cavity (11), a transition cavity (12) and a ventilation cavity (13) connected in sequence. The opening of the connecting cavity (11) extends to the outer peripheral wall of the aeration disc body (1). The ventilation cavity (13) is located at the center of the aeration disc body (1). The bottom surface of the aeration disc body (1) has a ventilation hole (14) that is connected to the ventilation cavity (13). The aeration assembly (2) includes an aeration pipe (21), a support block (22), and a reset element (23). The sliding part of the aeration pipe (21) is in the connecting cavity (11), and the aeration pipe (21) extends into the transition cavity (12). The support block (22) is located in the transition cavity (12). The support block (22) and the aeration pipe (21) are fixedly connected. One end of the reset element (23) is fixedly connected to the aeration disc body (1), and the other end is fixedly connected to the connecting block. Several aeration holes (211) are opened on the side wall of the aeration pipe (21). The aeration pipe (21) is closed at the end near the outside and open at the end inside the aeration disc. The inner cavity of the aeration pipe (21) is connected to the transition cavity (12). In the initial state, the aeration pipe (21) is located inside the aeration disc body (1).

2. The process apparatus for preparing high-quality brine using ultrafiltration membrane as described in claim 1, characterized in that: The support block (22) and the transition cavity (12) are slidably connected.

3. The process apparatus for preparing high-quality brine using ultrafiltration membrane as described in claim 1, characterized in that: The bottom surface of the aeration pipe (21) is provided with a discharge hole (212), which is used to discharge the fluid that enters the aeration pipe (21) in small amounts during recycling.

4. The process apparatus for preparing high-quality brine using ultrafiltration membrane as described in claim 3, characterized in that: The distance between the discharge hole (212) and the closed end of the aeration pipe (21) is less than the distance between the closed end of the aeration pipe (21) and its nearest aeration hole (211).

5. The process apparatus for preparing high-quality brine using ultrafiltration membrane as described in claim 3, characterized in that: The aeration pipe (21) is equipped with a flow limiting block (24), which has a limiting surface (241) that slopes downward from the center of the aeration disc body (1) to its periphery. The discharge hole (212) is located between the closed end of the aeration pipe (21) and the flow limiting block (24).

6. The process apparatus for preparing high-quality brine using ultrafiltration membrane as described in claim 1, characterized in that: A connecting component (3) is arranged on the bottom surface of the aeration disc. The connecting component (3) includes a connecting pipe (31) and a rotating pipe (32). The connecting pipe (31) is fixedly connected to the bottom surface of the aeration disc body (1). The connecting pipe (31) is connected to the air hole (14). The connecting pipe (31) and the rotating pipe (32) are rotatably connected. The connecting pipe (31) and the rotating pipe (32) are connected.

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