Hydrochloric acid continuous concentration double membrane dynamic balance integrated device
Patent Information
- Application Number
- CN202522035644.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-09-22
AI Technical Summary
[0004]本申请的目的是提供盐酸连续浓缩双膜动态平衡集成设备，具备多级反渗功能与膜污染控制功能等优点，解决了现有盐酸连续浓缩双膜动态平衡集成设备采用单级反渗透或蒸发工艺，能耗高且盐酸易挥发损失，缺乏预处理与膜污染控制功能，胶体杂质容易堵塞膜孔的问题
该盐酸连续浓缩双膜动态平衡集成设备，通过耐酸陶瓷微滤膜作为预处理的核心，可以拦截盐酸原料中的固体颗粒、胶体等杂质，可以防止后续精密膜堵塞，提升系统稳定性，通过碳化硅增强聚酰胺复合膜在反渗透单元内，可以实现初级浓缩，通过高压驱动，可以将盐酸浓度提升至中高范围，可以提升膜的耐酸腐蚀性及机械强度，通过设置磺酸基改性纳滤膜，可以精制阶段选择性分离离子，可以产出高纯度盐酸，同时，磺酸基团增强膜表面均匀亲水性及抗污染性，通过耐酸陶瓷微滤膜、碳化硅增强聚酰胺复合膜和磺酸基改性纳滤膜的配合，可以有效提升设备对盐酸浓缩过程中杂质的分离效率，同时，动态平衡控制组件与脉冲式反冲组件的结合使用，可以确保系统在长时间运行中的稳定性和抗污染能力，废水收集罐通过收集管与系统连接，可将处理过程中产生的废液集中存储，便于后续处理或排放，此外，控制器内部集成了智能化控制系统，可实现对各单元运行状态的实时监测与调节，从而优化整体工艺流程并降低能耗。
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Abstract
Description
Technical Field
[0001] This application relates to hydrochloric acid concentration, and more particularly to a dual-membrane dynamic equilibrium integrated device for continuous hydrochloric acid concentration. Background Technology
[0002] Industrial processes using hydrochloric acid to clean materials or equipment such as steel generate large quantities of waste hydrochloric acid with high iron content. This hydrochloric acid, with its high iron content and low concentration, lacks industrial application value, and direct discharge as wastewater would cause serious pollution. However, through simple treatment processes under relatively mild conditions, this waste acid can be processed to obtain industrial-grade concentrated hydrochloric acid with significant commercial value.
[0003] Existing hydrochloric acid continuous concentration dual-membrane dynamic balance integrated equipment mostly adopts single-stage reverse osmosis or evaporation processes. Single-stage reverse osmosis membranes are easily corroded and perforated by hydrochloric acid under high pressure, resulting in the dissolution of metal ions and product contamination. They also have high energy consumption, easy volatilization and loss of hydrochloric acid, low recovery rate, lack of pretreatment and membrane fouling control functions, and require shutdown for cleaning after colloidal impurities clog the membrane pores, resulting in poor production continuity. In order to solve the above problems, a hydrochloric acid continuous concentration dual-membrane dynamic balance integrated equipment is proposed. Utility Model Content
[0004] The purpose of this application is to provide a dual-membrane dynamic equilibrium integrated equipment for continuous hydrochloric acid concentration, which has the advantages of multi-stage reverse osmosis and membrane fouling control functions. It solves the problems of existing dual-membrane dynamic equilibrium integrated equipment for continuous hydrochloric acid concentration that adopt single-stage reverse osmosis or evaporation processes, resulting in high energy consumption, easy volatilization and loss of hydrochloric acid, lack of pretreatment and membrane fouling control functions, and easy clogging of membrane pores by colloidal impurities.
[0005] The hydrochloric acid continuous concentration dual-membrane dynamic balance integrated equipment provided in this application adopts the following technical solution: it includes a pretreatment unit, a reverse osmosis unit, a nanofiltration purification unit, a dynamic balance control component, a pulse backwash component, a wastewater collection tank, a hydrochloric acid collection tank, and a control cabinet. The pretreatment unit is equipped with an acid-resistant ceramic microfiltration membrane, the reverse osmosis unit is equipped with a silicon carbide reinforced polyamide composite membrane, and the nanofiltration purification unit is equipped with a sulfonic acid modified nanofiltration membrane. The pretreatment unit is connected to the reverse osmosis unit through a first pipe, the reverse osmosis unit is connected to the nanofiltration purification unit through a second pipe, and the nanofiltration purification unit is connected to the hydrochloric acid collection tank through a third pipe. An acid-resistant high-pressure pump is installed on the surface of the first pipe. By adopting the above technical solutions, using acid-resistant ceramic microfiltration membranes as the core of pretreatment, solid particles, colloids, and other impurities in hydrochloric acid feedstock can be intercepted, preventing subsequent clogging of precision membranes and improving system stability. Silicon carbide-reinforced polyamide composite membranes within the reverse osmosis unit enable primary concentration; high-pressure driving can raise the hydrochloric acid concentration to a medium-to-high range, enhancing the membrane's acid corrosion resistance and mechanical strength. The inclusion of sulfonic acid-modified nanofiltration membranes allows for selective ion separation during the purification stage, producing high-purity hydrochloric acid. Simultaneously, the sulfonic acid groups enhance the membrane surface's uniform hydrophilicity and antifouling properties. By combining acid-resistant ceramic microfiltration membranes, silicon carbide-reinforced polyamide composite membranes, and sulfonic acid-modified nanofiltration membranes, the separation efficiency of impurities during hydrochloric acid concentration can be effectively improved. At the same time, the combined use of dynamic balance control components and pulse backwash components can ensure the stability and anti-fouling ability of the system during long-term operation. The wastewater collection tank is connected to the system to centrally store the waste liquid generated during the treatment process, which is convenient for subsequent treatment or discharge. In addition, the controller integrates an intelligent control system, which can realize real-time monitoring and adjustment of the operating status of each unit, thereby optimizing the overall process flow and reducing energy consumption.
[0006] Preferably, the pretreatment unit, reverse osmosis unit and nanofiltration purification unit are respectively provided with a first backwash port, a second backwash port and a third backwash port on their surfaces, and the pulse backwash assembly includes a water pump and a backwash pipe; By adopting the above technical solution and setting the first backwash interface, the second backwash interface and the third backwash interface, independent backwashing operations can be achieved for the pretreatment unit, the reverse osmosis unit and the nanofiltration purification unit. The water pump in the pulse backwash component is connected to each backwash interface through the backwash pipe, and the backwashing program can be started as needed or according to conditions to effectively remove dirt and impurities from the membrane surface.
[0007] Preferably, the inlet end of the backwash pipe is fixedly connected to the outlet end of the water pump, the inlet end of the water pump is connected to the pure water supply system, the surface of the backwash pipe is provided with three connecting pipes, the outlet ends of the three connecting pipes are respectively connected to the inlet ends of the first backwash interface, the second backwash interface and the third backwash interface, and the surface of the connecting pipes is provided with a pulse control valve. By adopting the above technical solution and setting a pulse control valve, the intensity and frequency of backwash water flow can be precisely controlled, thereby effectively removing dirt and impurities from the membrane surface and extending the service life of the membrane module. During the backwashing process, pure water is pressurized by a water pump and enters the backwashing pipeline, and is then transported to the backwashing interfaces of the pretreatment unit, reverse osmosis unit, and nanofiltration purification unit through three connecting pipes. This design not only improves the cleaning efficiency of the equipment, but also reduces the need for manual intervention, ensuring the stability and continuity of system operation.
[0008] Preferably, the dynamic balance control component includes a conductivity sensor, a pressure transmitter, and a variable frequency booster pump, wherein the pressure transmitter is installed on a first pipeline and the conductivity sensor is installed on a third pipeline. By adopting the above technical solutions and setting up a conductivity sensor, the purity of concentrated hydrochloric acid can be monitored in real time and automatically fed back to the controller to adjust process parameters. By setting up a pressure transmitter, the inlet pressure of the reverse osmosis unit can be dynamically adjusted according to the degree of membrane fouling, which can maintain a stable flux and avoid membrane damage or efficiency reduction caused by pressure fluctuations.
[0009] Preferably, the output end of the variable frequency booster pump is provided with a booster outlet pipe, the surface of the reverse osmosis unit is provided with a booster interface, and the output end of the booster outlet pipe is connected to the booster interface; By adopting the above technical solution and setting up a variable frequency booster pump, the output pressure can be automatically adjusted according to the system requirements, thereby optimizing the operating efficiency of the reverse osmosis unit. The connection design between the booster outlet pipe and the booster interface can ensure the stability and reliability of pressure transmission and avoid damage to the membrane module due to pressure fluctuations.
[0010] Preferably, the control cabinet is equipped with a controller, which is electrically connected to a conductivity sensor, a pressure transmitter, a frequency converter booster pump, an acid-resistant high-pressure pump, and a hydrochloric acid feed pump. By adopting the above technical solution, and integrating sensor signals and actuators into the controller, automated processes can be achieved.
[0011] Preferably, the pretreatment unit, the reverse osmosis unit and the nanofiltration purification unit are respectively provided with a first drain valve, a second drain valve and a third drain valve at their bottoms, and a collection pipe is fixedly connected to the side of the wastewater collection tank. The bottoms of the first drain valve, the second drain valve and the third drain valve are all fixedly connected to the surface of the collection pipe. By adopting the above technical solution and setting up multiple discharge valves and collection pipes, pre-treated impurities, reverse osmosis low-concentration acid, and nanofiltration metal ion waste liquid can be collected into a wastewater tank, making it convenient for people to recycle or treat them in compliance with regulations.
[0012] Preferably, the pretreatment unit is provided with a feed pipe at the top, and a hydrochloric acid feed pump is provided at the input end of the feed pipe; By adopting the above technical solution and setting up a hydrochloric acid feed pump, the flow rate and pressure of the raw materials can be controlled, the processing capacity of the membrane system can be matched, and overload can be prevented.
[0013] In summary, this application includes at least one of the following beneficial technical effects: This integrated dual-membrane dynamic equilibrium hydrochloric acid continuous concentration system utilizes an acid-resistant ceramic microfiltration membrane as the core of pretreatment. This membrane intercepts solid particles, colloids, and other impurities in the hydrochloric acid feedstock, preventing subsequent clogging of the precision membrane and improving system stability. A silicon carbide-reinforced polyamide composite membrane within the reverse osmosis unit enables primary concentration. High-pressure drive allows for increasing the hydrochloric acid concentration to a medium-to-high range, enhancing the membrane's acid corrosion resistance and mechanical strength. A sulfonic acid-modified nanofiltration membrane enables selective ion separation during the purification stage, producing high-purity hydrochloric acid. Simultaneously, the sulfonic acid groups enhance the membrane surface's uniform hydrophilicity and antifouling properties. By combining acid-resistant ceramic microfiltration membranes, silicon carbide-reinforced polyamide composite membranes, and sulfonic acid-modified nanofiltration membranes, the separation efficiency of impurities during hydrochloric acid concentration can be effectively improved. At the same time, the combined use of dynamic balance control components and pulse backwash components can ensure the stability and anti-fouling ability of the system during long-term operation. The wastewater collection tank is connected to the system through a collection pipe, which can centrally store the waste liquid generated during the treatment process for subsequent treatment or discharge. In addition, the controller integrates an intelligent control system, which can realize real-time monitoring and adjustment of the operating status of each unit, thereby optimizing the overall process flow and reducing energy consumption. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a structural block diagram of the preprocessing unit in this application. Figure 3 This is a structural block diagram of the reverse osmosis unit in this application. Figure 4 This is a structural block diagram of the nanofiltration purification unit in this application. Figure 5 This is a structural block diagram of the dynamic balance control component in this application. Figure 6 This is a structural block diagram of the pulse recoil assembly in operation in this application; Figure 7 This is a block diagram of the controller operation in this application.
[0015] In the picture: 1. Pretreatment unit; 101. Acid-resistant ceramic microfiltration membrane; 102. First drain valve; 103. First backflushing port; 104. Feed pipe; 2. Reverse osmosis unit; 201. Silicon carbide reinforced polyamide composite membrane; 202. Second backflushing port; 203. Pressurization port; 204. Second drain valve; 3. Nanofiltration purification unit; 301. Sulfonic acid-modified nanofiltration membrane; 302. Third backflush port; 303. Third drain valve; 4. Wastewater collection tank; 401. Collection pipe; 5. Dynamic balance control components; 501. Pressure transmitter; 502. Conductivity sensor; 503. Variable frequency booster pump; 504. Booster outlet pipeline; 6. Pulse-type backwash assembly; 601. Water pump; 602. Backwash pipeline; 603. Connecting pipe; 604. Pulse control valve; 7. First pipeline; 8. Second pipeline; 9. Third pipeline; 10. Control cabinet; 1001. Controller; 11. Hydrochloric acid collection tank; 12. Hydrochloric acid feed pump; 13. Acid-resistant high-pressure pump. Detailed Implementation
[0016] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.
[0017] Example 1: Integrated dual-membrane dynamic equilibrium device for continuous hydrochloric acid concentration, referring to... Figure 1 , Figure 2 , Figure 3 and Figure 4 It includes a pretreatment unit 1, a reverse osmosis unit 2, a nanofiltration purification unit 3, a dynamic balance control component 5, a pulse backwash component 6, a wastewater collection tank 4, a hydrochloric acid collection tank 11, and a control cabinet 10. The pretreatment unit 1 is equipped with an acid-resistant ceramic microfiltration membrane 101, the reverse osmosis unit 2 is equipped with a silicon carbide reinforced polyamide composite membrane 201, and the nanofiltration purification unit 3 is equipped with a sulfonic acid modified nanofiltration membrane 301. Pretreatment unit 1 is connected to reverse osmosis unit 2 via first pipe 7. Reverse osmosis unit 2 is connected to nanofiltration purification unit 3 via second pipe 8. Nanofiltration purification unit 3 is connected to hydrochloric acid collection tank 11 via third pipe 9. An acid-resistant high-pressure pump 13 is installed on the surface of first pipe 7. Using an acid-resistant ceramic microfiltration membrane 101 as the core of pretreatment, it can intercept solid particles, colloids, and other impurities in the hydrochloric acid feedstock, preventing subsequent precision membrane clogging and improving system stability. A silicon carbide-reinforced polyamide composite membrane 201 is used in reverse osmosis unit 2 to achieve primary concentration. Driven by high pressure, the hydrochloric acid concentration can be increased to a medium-high range, improving the membrane's acid corrosion resistance and mechanical strength. By setting a sulfonic acid-modified nanofiltration membrane 301, selective separation can be achieved during the purification stage. The ions can produce high-purity hydrochloric acid. At the same time, the sulfonic acid groups enhance the uniform hydrophilicity and antifouling properties of the membrane surface. Through the combination of acid-resistant ceramic microfiltration membrane 101, silicon carbide reinforced polyamide composite membrane 201 and sulfonic acid modified nanofiltration membrane 301, the separation efficiency of impurities in the hydrochloric acid concentration process can be effectively improved. Meanwhile, the combined use of dynamic balance control component 5 and pulse backwash component 6 can ensure the stability and antifouling ability of the system during long-term operation. The wastewater collection tank 4 is connected to the system and can centrally store the waste liquid generated during the treatment process for subsequent treatment or discharge. In addition, the controller 1001 integrates an intelligent control system, which can realize real-time monitoring and adjustment of the operating status of each unit, thereby optimizing the overall process flow and reducing energy consumption.
[0018] Please see Figure 1 and Figure 5The pretreatment unit 1, reverse osmosis unit 2, and nanofiltration purification unit 3 are respectively provided with a first backwash port 103, a second backwash port 202, and a third backwash port 302. The pulse-type backwash assembly 6 includes a water pump 601 and a backwash pipe 602. By setting the first backwash port 103, the second backwash port 202, and the third backwash port 302, independent backwashing operations can be realized for the pretreatment unit 1, reverse osmosis unit 2, and nanofiltration purification unit 3. The water pump 601 in the pulse-type backwash assembly 6 is connected to each backwash port through the backwash pipe 602. The backwashing program can be started as needed or according to conditions to effectively remove dirt and impurities from the membrane surface. The input end of the backwash pipe 602 is fixedly connected to the output end of the water pump 601. The input end of the water pump 601 is connected to the pure water supply system for backwashing. Three connecting pipes 603 are provided on the surface of the pipe 602. The output ends of the three connecting pipes 603 are respectively connected to the input ends of the first backwash port 103, the second backwash port 202, and the third backwash port 302. A pulse control valve 604 is provided on the surface of the connecting pipe 603. By setting the pulse control valve 604, the water flow intensity and frequency of backwashing can be precisely controlled, thereby effectively removing dirt and impurities from the membrane surface and extending the service life of the membrane module. During the backwashing process, pure water is pressurized by the water pump 601 and enters the backwash pipe 602. It is then transported to the backwash ports of the pretreatment unit 1, the reverse osmosis unit 2, and the nanofiltration purification unit 3 via the three connecting pipes 603. This design not only improves the cleaning efficiency of the equipment but also reduces the need for manual intervention, ensuring the stability and continuity of system operation.
[0019] Please see Figure 1 and Figure 6 The dynamic balance control component 5 includes a conductivity sensor 502, a pressure transmitter 501, and a variable frequency booster pump 503. The pressure transmitter 501 is installed on the first pipeline 7, and the conductivity sensor 502 is installed on the third pipeline 9. By setting the conductivity sensor 502, the purity of concentrated hydrochloric acid can be monitored in real time and automatically fed back to the controller 1001 to adjust process parameters. By setting the pressure transmitter 501, the inlet pressure of the reverse osmosis unit 2 can be dynamically adjusted according to the degree of membrane fouling, maintaining a stable flux and avoiding pressure differential fluctuations. In case of membrane damage or efficiency decline, the output end of the variable frequency booster pump 503 is equipped with a booster outlet pipe 504, and the surface of the reverse osmosis unit 2 is equipped with a booster interface 203. The output end of the booster outlet pipe 504 is connected to the booster interface 203. By setting up the variable frequency booster pump 503, the output pressure can be automatically adjusted according to the system requirements, thereby optimizing the operating efficiency of the reverse osmosis unit 2. The connection design between the booster outlet pipe 504 and the booster interface 203 can ensure the stability and reliability of pressure transmission and avoid damage to the membrane module due to pressure fluctuations.
[0020] Please see Figure 1 and Figure 7The control cabinet 10 contains a controller 1001, which is electrically connected to a conductivity sensor 502, a pressure transmitter 501, a variable frequency booster pump 503, an acid-resistant high-pressure pump 13, and a hydrochloric acid feed pump 12. By integrating sensor signals and actuators through the controller 1001, automated processes can be achieved. The pretreatment unit 1, reverse osmosis unit 2, and nanofiltration purification unit 3 are respectively equipped with a first drain valve 102, a second drain valve 204, and a third drain valve 303 at their bottoms. A collection pipe 401 is fixedly connected to the side of the wastewater collection tank 4. The bottoms of the drain valve 102, the second drain valve 204, and the third drain valve 303 are all fixedly connected to the surface of the collection pipe 401. By setting multiple drain valves and the collection pipe 401, pretreatment impurities, reverse osmosis low-concentration acid, and nanofiltration metal ion waste liquid can be collected into the wastewater tank for easy recycling or compliant treatment. The top of the pretreatment unit 1 is equipped with a feed pipe 104, and the input end of the feed pipe 104 is equipped with a hydrochloric acid feed pump 12. By setting the hydrochloric acid feed pump 12, the flow rate and pressure of the raw materials can be controlled to match the processing capacity of the membrane system and prevent overload.
[0021] The implementation principle of this application embodiment is as follows: During use, dilute hydrochloric acid raw material is transported to pretreatment unit 1 through hydrochloric acid feed pump 12. Under the action of acid-resistant ceramic microfiltration membrane 101, suspended particles, colloids and macromolecular impurities can be filtered to prevent subsequent precision membrane clogging. The clear liquid after pretreatment is pressurized by acid-resistant high-pressure pump 13 through the first pipe 7 and enters reverse osmosis unit 2. Reverse osmosis unit 2 adopts silicon carbide reinforced polyamide composite membrane 201, which has high acid resistance and pressure resistance. Under high pressure, water molecules and a small amount of H⁺ and Cl⁻ ions permeate through the membrane to become permeate. The concentration of hydrochloric acid in the retentate is significantly increased, so that hydrochloric acid can be concentrated. The retentate enters nanofiltration purification unit 3 through the second pipe 8. The nanofiltration purification unit 3 is equipped with sulfonic acid modified nanofiltration membrane 301. It can further separate metal ions and macromolecular impurities in the retentate by relying on the charge repulsion effect of sulfonic acid groups on the membrane surface and nanoscale pore size, thereby producing high-purity hydrochloric acid, which flows into hydrochloric acid collection tank 11 for collection through the third pipe 9. Impurities and waste acid discharged from each unit are collected into the collection pipe 401 through the first discharge valve 102, the second discharge valve 204, and the third discharge valve 303, and are finally stored in the wastewater collection tank 4 for subsequent treatment. When the transmembrane pressure difference increases, the water pump 601 draws water from the pure water system and delivers it through the backwash pipe 602. The pulse control valve 604 opens and closes periodically, which can be divided into three paths to the connecting pipe 603. Then, through the backwash interface, a high-frequency water flow is generated to impact the membrane surface and remove contaminants. The three connecting pipes 603 are respectively connected to the backwash interfaces of the pretreatment, reverse osmosis and nanofiltration units to realize modular or linkage cleaning. Pressure transmitter 501 monitors the pressure in the first pipeline 7 and feeds it back to controller 1001. When the pressure is insufficient, variable frequency booster pump 503 can be started. Conductivity sensor 502 detects the conductivity of hydrochloric acid in the third pipeline 9 and converts it into a concentration value. If the concentration does not meet the standard, variable frequency booster pump 503 can also be started. Through booster outlet pipeline 504 and booster interface 203, pressure can be added to reverse osmosis unit 2 to maintain the optimal operating pressure.
[0022] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A continuous hydrochloric acid concentration dual-membrane dynamic balance integrated equipment, comprising a pretreatment unit (1), a reverse osmosis unit (2), a nanofiltration purification unit (3), a dynamic balance control component (5), a pulse backwash component (6), a wastewater collection tank (4), a hydrochloric acid collection tank (11), and a control cabinet (10), characterized in that: The pretreatment unit (1) is equipped with an acid-resistant ceramic microfiltration membrane (101), the reverse osmosis unit (2) is equipped with a silicon carbide reinforced polyamide composite membrane (201), and the nanofiltration purification unit (3) is equipped with a sulfonic acid modified nanofiltration membrane (301). The pretreatment unit (1) is connected to the reverse osmosis unit (2) through the first pipe (7), the reverse osmosis unit (2) is connected to the nanofiltration purification unit (3) through the second pipe (8), the nanofiltration purification unit (3) is connected to the hydrochloric acid collection tank (11) through the third pipe (9), and an acid-resistant high-pressure pump (13) is provided on the surface of the first pipe (7).
2. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated equipment according to claim 1, characterized in that: The pretreatment unit (1), reverse osmosis unit (2) and nanofiltration purification unit (3) are respectively provided with a first backwash port (103), a second backwash port (202) and a third backwash port (302). The pulse backwash assembly (6) includes a water pump (601) and a backwash pipe (602).
3. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated equipment according to claim 2, characterized in that: The input end of the backwash pipe (602) is fixedly connected to the output end of the water pump (601). The input end of the water pump (601) is connected to the pure water supply system. Three connecting pipes (603) are provided on the surface of the backwash pipe (602). The output ends of the three connecting pipes (603) are respectively connected to the input ends of the first backwash interface (103), the second backwash interface (202) and the third backwash interface (302). A pulse control valve (604) is provided on the surface of the connecting pipe (603).
4. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated device according to claim 1, characterized in that: The dynamic balance control component (5) includes a conductivity sensor (502), a pressure transmitter (501), and a variable frequency booster pump (503). The pressure transmitter (501) is installed on the first pipeline (7), and the conductivity sensor (502) is installed on the third pipeline (9).
5. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated device according to claim 4, characterized in that: The variable frequency booster pump (503) is provided with a booster outlet pipe (504) at its output end, and the reverse osmosis unit (2) is provided with a booster interface (203) on its surface. The output end of the booster outlet pipe (504) is connected to the booster interface (203).
6. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated device according to claim 1, characterized in that: The control cabinet (10) is equipped with a controller (1001), which is electrically connected to a conductivity sensor (502), a pressure transmitter (501), a frequency converter booster pump (503), an acid-resistant high-pressure pump (13), and a hydrochloric acid feed pump (12).
7. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated device according to claim 1, characterized in that: The pretreatment unit (1), reverse osmosis unit (2) and nanofiltration purification unit (3) are respectively provided with a first drain valve (102), a second drain valve (204) and a third drain valve (303) at their bottoms. The wastewater collection tank (4) is fixedly connected to a collection pipe (401) on its side. The bottoms of the first drain valve (102), the second drain valve (204) and the third drain valve (303) are all fixedly connected to the surface of the collection pipe (401).
8. The hydrochloric acid continuous concentration dual-membrane dynamic equilibrium integrated device according to claim 1, characterized in that: The pretreatment unit (1) is provided with a feed pipe (104) at the top, and a hydrochloric acid feed pump (12) is provided at the input end of the feed pipe (104).