Formation liquid recycling equipment and method

Abstract

The invention relates to the technical field of formation liquid recycling, and discloses formation liquid recycling equipment and method.The output end of a waste water tank is provided with a first recycling unit and a second recycling unit which are arranged side by side and are the same in structure, the first recycling unit comprises a front membrane filtering tank, and the water outlet end of the front membrane filtering tank communicates with an RO membrane filtering tank through a water production pipeline; a plurality of layers of intelligent polymer filter membranes are arranged in the front membrane filter box, each group of intelligent polymer filter membranes is connected with a temperature regulation and control unit through an electric wire, and each group of intelligent polymer filter membranes is connected with an electric field regulation unit through a wire, so that specific impurities in the formation liquid can be effectively treated through introduction of the front membrane filter box; the RO membrane filter box is ensured to operate in clean liquid, the working efficiency of the membrane is improved, and the temperature regulation and control unit and the electric field regulation unit meet the filtering requirements of pollution of different concentrations and pollution of different ion concentrations by changing pores of the temperature-sensitive polymer membrane and charge distribution on the surface of the temperature-sensitive polymer membrane.

Description

Technical Field

[0001] This invention relates to the field of chemical formation liquid recovery technology, and in particular to a chemical formation liquid recovery and utilization device and method. Background Technology

[0002] As the domestic demand for aluminum electrolytic capacitors continues to rise, the market demand for its key raw material, electrolytic foil, is also growing rapidly. Most electrolytic foil manufacturers use single-stage RO membranes to purify the electrolytic solution. However, due to the low output, easy clogging, and low purification rate of RO membranes, the electrolytic solution purification equipment cannot meet the needs of various electrolytic foil manufacturers. Some manufacturers choose to discharge the contaminated electrolytic solution into sewage, which is then treated and discharged, resulting in a waste of resources.

[0003] In the method for recycling waste liquid from electrode foil forming tank with application number CN202210813683.7, the primary concentrate is concentrated by secondary evaporation and then cooled to crystallize. After rinsing the crystals with water in step four, the mixed liquid containing the crystals is separated and filtered to obtain crystals and mother liquor. The mother liquor is returned to step four for recycling. The crystals are sent to freshly prepared heated pure water, stirred and dissolved, and then returned for reuse. All substances in the waste liquid are recycled, fundamentally solving the problem of classifying and recycling useful substances.

[0004] However, in actual use, traditional formation solutions contain ions that affect conductivity, such as Al3+ and NH4+, which require overflow treatment, leading to chemical waste and environmental pollution. Although existing membrane concentration and separation control systems can separate most ions, they still have insufficient efficiency. Moreover, the current purification equipment has low liquid production efficiency, which means that the concentrate cannot be completely recovered. Some overflow liquid needs to be discharged into the wastewater treatment control system, increasing the treatment pressure and wasting boric acid and water resources.

[0005] Therefore, this invention proposes a device and method for recycling chemical formation liquid to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for recycling chemical formation liquid to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a chemical reaction liquid recycling device, including a wastewater tank, a first recycling unit and a second recycling unit with the same structure installed in parallel at the output end of the wastewater tank, the first recycling unit including a pre-membrane filter box, the outlet end of the pre-membrane filter box being connected to an RO membrane filter box through a product water pipe, and the tail end of the pre-membrane filter box being connected to a storage tank through a backwash pipe, a chemical cleaning tank being installed on the pre-membrane filter box, and a clean water cleaning tank being installed on the RO membrane filter box; The input end of the pre-membrane filter box is equipped with a first sensor group, the output end of the pre-membrane filter box is equipped with a second sensor group, the input end of the RO membrane filter box is equipped with a third sensor group, and the output end of the RO membrane filter box is equipped with a fourth sensor group. The pre-filter box has multiple layers of intelligent polymer filter membranes built in, and each intelligent polymer filter membrane is connected to a temperature control unit via wires, and each intelligent polymer filter membrane is connected to an electric field adjustment unit via wires.

[0008] Preferably, each set of smart polymer filter membranes uses a temperature-sensitive polymer membrane.

[0009] Preferably, the input end of the pre-filter box is connected to the wastewater tank via an inlet pipe, the output end of the RO membrane filter box is connected to a drain pipe, a first solenoid valve is fixedly installed on the backwash pipe, and a second solenoid valve is fixedly installed on the product water pipe.

[0010] Preferably, the chemical cleaning tank has a built-in water pump, and the water pump is connected to the pre-membrane filter box through the first cleaning pipe for backwashing and cleaning the pre-membrane filter box.

[0011] Preferably, the clean water cleaning tank has a built-in clean water pump, and the clean water pump is connected to the RO membrane filter box through a second cleaning pipe for backwashing and cleaning the RO membrane filter box.

[0012] Preferably, the first sensor group and the second sensor group incorporate an optical sensor, a conductivity sensor, an ion-selective electrode, and a flow meter.

[0013] Preferably, the third and fourth sensor groups incorporate a conductivity sensor, an ion-selective electrode, and a flow meter.

[0014] This invention provides a method for recycling chemical formation liquid, which is implemented using chemical formation liquid recycling equipment. The steps of the recycling method are as follows: S1: First, the formation liquid is simultaneously input into the first recovery unit and the second recovery unit through the wastewater tank. The first sensor group detects the type, concentration, conductivity and flow rate of pollutants in the formation liquid in real time. The temperature control unit and the electric field adjustment unit adjust the pre-membrane filter box according to the data detected by the first sensor group. The formation liquid is filtered through the pre-membrane filter box to optimize the removal effect of suspended solids, ions and macromolecular pollutants in the formation liquid. S2: The second sensor group performs real-time detection on the liquid filtered by the pre-membrane filter box to detect the filtration effect of the pre-membrane filter box. The clean liquid flows to the RO membrane filter box through the product water pipe, while the concentrate formed during the filtration process flows to the storage tank through the backwash pipe. When the flow difference before and after the pre-membrane filter box exceeds the first threshold, a backwashing operation is performed through the storage tank. When the flow difference before and after the pre-membrane filter box exceeds the second threshold, the pre-membrane filter box is chemically cleaned through the chemical cleaning tank to remove contaminants from the surface of the intelligent polymer filter membrane. S3: The third sensor group detects the conductivity and ion concentration of pollutants in the liquid input to the RO membrane filter box in real time. The RO membrane filter box further removes dissolved ions and small molecule pollutants in the liquid. The fourth sensor group detects the effluent data of the RO membrane filter box in real time to ensure that the effluent quality meets the standards. When the flow difference before and after the RO membrane filter box exceeds the third threshold, a clean water cleaning box is used for cleaning.

[0015] The technical effects and advantages of this invention are as follows: 1. This invention, through the introduction of a pre-membrane filter box, effectively treats specific impurities in the formation liquid recovery control system, ensuring that the RO membrane filter box operates in a relatively clean liquid, improving membrane efficiency, reducing energy consumption, and extending membrane lifespan. The pre-membrane uses a temperature-sensitive polymer membrane, whose unique membrane material, charge characteristics, membrane pore size, and high-rate concentration process make it specifically suitable for formation liquid recovery control systems. It can flexibly adjust the working mode according to the varying characteristics and concentrations of the formation liquid, optimizing the recovery effect. This makes the pre-membrane technology play an irreplaceable role in formation liquid recovery, significantly improving the efficiency of the control system and the long-term stability of the membrane.

[0016] 2. This invention regulates the temperature-sensitive polymer membrane through a temperature control unit and an electric field adjustment unit. The control system can adjust the working mode of the temperature-sensitive polymer membrane in real time according to different pollution conditions of the formation solution. The temperature control unit and the electric field adjustment unit change the pore size and charge distribution on the surface of the temperature-sensitive polymer membrane to meet the filtration needs of different concentrations of pollution and different ion concentrations. When the concentration of the formation solution is high, the temperature control unit operates, causing the liquid temperature in the pre-membrane filter box to decrease, activating the pore expansion function of the temperature-sensitive polymer membrane, increasing the pore size of the membrane, thereby improving the filtration flux and ensuring that the control system can handle higher concentrations of pollutants. To avoid excessive clogging of the temperature-sensitive polymer membrane surface, the temperature reduction causes structural changes in the temperature-sensitive polymer membrane, increasing pore size and effectively removing larger particles and suspended solids. When the liquid is relatively clean, the control system controls the temperature regulation unit to raise the liquid temperature in the pre-filter chamber, shrinking the pores of the temperature-sensitive polymer membrane and enhancing its ability to remove small molecule pollutants. Under conditions of high pollution, the electric field adjustment unit enhances the charge adsorption capacity of the temperature-sensitive polymer membrane surface, specifically removing charged ions. When the ion concentration is low, the intensity of the electric field on the surface of the temperature-sensitive polymer membrane is weakened to avoid excessive adsorption of other dissolved substances, maintaining the high-efficiency filtration of the temperature-sensitive polymer membrane. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention; Figure 2 This is a schematic diagram of the overall second-view structure of the present invention; Figure 3 This is a schematic diagram of the structure of the first recycling unit of the present invention.

[0018] In the diagram: 10. Wastewater tank; 20. First recovery unit; 21. Pre-membrane filter box; 22. RO membrane filter box; 23. Inlet pipe; 24. Backwash pipe; 25. Product water pipe; 26. Drainage pipe; 27. First solenoid valve; 28. Second solenoid valve; 29. ​​First cleaning pipe; 210. Second cleaning pipe; 211. First sensor group; 212. Second sensor group; 213. Third sensor group; 214. Fourth sensor group; 30. Second recovery unit; 40. Storage tank; 50. Chemical cleaning tank; 60. Clean water cleaning tank; 70. Temperature control unit; 80. Electric field adjustment unit. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1 to 3 As shown in the figure, this embodiment discloses a chemical reaction liquid recycling device, including a wastewater tank 10. The output end of the wastewater tank 10 is equipped with a first recycling unit 20 and a second recycling unit 30 arranged in parallel and having the same structure. The first recycling unit 20 includes a pre-membrane filter box 21. The outlet end of the pre-membrane filter box 21 is connected to an RO membrane filter box 22 through a product water pipe 25, and the tail end of the pre-membrane filter box 21 is connected to a storage tank 40 through a backwash pipe 24. A chemical cleaning tank 50 is installed on the pre-membrane filter box 21, and a clean water cleaning tank 60 is installed on the RO membrane filter box 22.

[0021] The input end of the pre-membrane filter box 21 is equipped with a first sensor group 211, the output end of the pre-membrane filter box 21 is equipped with a second sensor group 212, the input end of the RO membrane filter box 22 is equipped with a third sensor group 213, and the output end of the RO membrane filter box 22 is equipped with a fourth sensor group 214.

[0022] The pre-filter box 21 has a built-in multi-layer intelligent polymer filter membrane. Each intelligent polymer filter membrane is a temperature-sensitive polymer membrane, and each intelligent polymer filter membrane is connected to a temperature control unit 70 via wires, and each intelligent polymer filter membrane is connected to an electric field adjustment unit 80 via wires.

[0023] The input end of the pre-membrane filter box 21 is connected to the wastewater tank 10 through the inlet pipe 23, and the wastewater tank 10 is equipped with a pump to drive the wastewater flow. A control valve is installed on the inlet pipe 23 and located behind the first sensor group 211 to facilitate the opening and closing control of the inlet pipe 23. The output end of the RO membrane filter box 22 is connected to the drain pipe 26. A first solenoid valve 27 is fixedly installed on the backwash pipe 24, and a second solenoid valve 28 is fixedly installed on the product water pipe 25. The chemical cleaning tank 50 has a built-in water supply pump, and the water supply pump is connected to the pre-membrane filter box 21 through the first cleaning pipe 29 for backwashing and cleaning the pre-membrane filter box 21. The clean water cleaning tank 60 has a built-in clean water pump, and the clean water pump is connected to the RO membrane filter box 22 through the second cleaning pipe 210 for backwashing and cleaning the RO membrane filter box 22.

[0024] Wastewater tank 10 is used to store the formation liquid to be treated, and the formation liquid is sent to the first recovery unit 20 and the second recovery unit 30 through the inlet pipe 23. Specifically, it includes a pre-membrane filter box 21 and an RO membrane filter box 22. The pre-membrane filter box 21 performs preliminary filtration of the formation liquid through the built-in multi-layer temperature-sensitive polymer membrane to remove suspended solids, ions and macromolecular pollutants. The RO membrane filter box 22 further removes dissolved ions and small molecule pollutants in the formation liquid. The pre-membrane filter box 21 and the RO membrane filter box 22 are connected by a product water pipe 25 and a backwash pipe 24 to form a closed-loop working control system. The operating status of the equipment is adjusted by an intelligent control system.

[0025] In this technical field, the backwashing technology used in the formation liquid recovery process is an existing technology, which is traceable and is a molding technology applied to this technical field. The core key technology of this embodiment lies in the introduction of the pre-membrane filter box 21 and the built-in temperature-sensitive polymer membrane in the pre-membrane filter box 21, which improves the adaptive filtration capacity of the pre-membrane filter box 21. At the same time, the working mode of the pre-membrane and RO membrane is adjusted according to the waste liquid concentration. This makes the pre-membrane technology play an irreplaceable role in the formation liquid recovery, significantly improving the efficiency of the control system and the long-term stability of the membrane.

[0026] The first sensor group 211 and the second sensor group 212 incorporate an optical sensor, a conductivity sensor, an ion-selective electrode, and a flow meter. The third sensor group 213 and the fourth sensor group 214 incorporate a conductivity sensor, an ion-selective electrode, and a flow meter.

[0027] The first sensor group 211 is installed at the input end of the pre-membrane filter box 21. It is responsible for real-time detection of the pollutant type, concentration, conductivity, and flow parameters of the formation liquid. Based on the formation liquid data detected by the sensors, the temperature control unit 70 and the electric field adjustment unit 80 intelligently adjust the pre-membrane. Specifically, when the concentration of the formation liquid is high, the temperature control unit 70 expands the pores of the temperature-sensitive polymer membrane by lowering the temperature, increasing the flux of the temperature-sensitive polymer membrane and improving the removal efficiency of suspended particles and macromolecular pollutants. At the same time, the electric field adjustment unit 80 enhances the adsorption capacity of the temperature-sensitive polymer membrane for charged pollutants by adjusting the charge distribution on the surface of the temperature-sensitive polymer membrane, especially the filtration effect of charged ions such as aluminum ions and ammonium ions. When the concentration of the formation liquid is low, the control system automatically raises the temperature, causing the pores of the pre-membrane to shrink, thereby improving the separation accuracy of the temperature-sensitive polymer membrane for small molecules and dissolved pollutants.

[0028] The output of the pre-filter 21 is further monitored by a second sensor group 212. This sensor group detects the liquid after filtration through the temperature-sensitive polymer membrane in real time to ensure that the filtration effect of the temperature-sensitive polymer membrane meets the requirements. The clean liquid flows through the product water pipe 25 to the RO membrane filter 22 for further deep treatment. During the filtration process, the concentrate produced in the pre-filter 21 flows through the backwash pipe 24 to the storage tank 40. The storage tank 40 is connected to the wastewater tank 10 through a return pipe, and a return pump is installed on the return pipe to discharge the liquid inside the storage tank 40 into the wastewater tank 10 for secondary filtration. A backwash pump is also installed on the backwash pipe 24. When the flow difference before and after the pre-membrane filter box 21 exceeds the first threshold, the control system will automatically activate the backwash pump, causing the liquid inside the storage tank 40 to enter the pre-membrane filter box 21 through the backwash pipe 24 to perform a backwash operation on the pre-membrane, thereby cleaning the surface of the temperature-sensitive polymer membrane and restoring its filtration capacity. If the flow difference before and after the pre-membrane filter box 21 exceeds the second threshold, it indicates that the temperature-sensitive polymer membrane is severely clogged. At this time, the control system will activate the chemical cleaning tank 50 and introduce chemical cleaning agent into the pre-membrane filter box 21 through the first cleaning pipe 29 to remove contaminants from the surface of the temperature-sensitive polymer membrane and ensure the long-term efficient operation of the membrane.

[0029] It is worth noting that the temperature-sensitive polymer membrane uses PNIPAAm, which is the most common temperature-sensitive polymer and has significant LCST characteristics. When the temperature is above the LCST, the polymer chains shrink, and the membrane pore size decreases; when the temperature is below the LCST, the polymer chains expand, and the pore size increases. Under high-concentration pollutant conditions, the pores of the PNIPAAm membrane expand, which helps filter larger particles. At low temperatures, the hydrophilicity of the PNIPAAm membrane increases, and the pores shrink, making it suitable for removing small molecule pollutants, such as inorganic ions and small organic molecules. The unique properties of the temperature-sensitive polymer membrane enable it to intelligently adjust the membrane pore size and filtration performance according to changes in pollutant concentration in formation liquid recovery applications. Under high-concentration pollutant conditions, the membrane pore size expands, increasing the flux and helping to remove larger particles and suspended solids, while under low-concentration pollutant conditions, the membrane pore size shrinks, effectively improving the removal efficiency of small molecule pollutants.

[0030] By introducing the pre-membrane filter box 21, specific impurities in the formation solution, especially aluminum ions, ammonium ions, boric acid, and phosphate, can be effectively treated in the formation solution recovery control system. This ensures that the RO membrane filter box 22 operates in a relatively clean liquid, improving membrane efficiency, reducing energy consumption, and extending membrane lifespan. The pre-membrane uses a temperature-sensitive polymer membrane, which, through its unique membrane material, charge characteristics, membrane pore size, and high-rate concentration process, is specifically designed for the formation solution recovery control system. It can flexibly adjust the working mode according to the varying characteristics and concentrations of the formation solution, optimizing the recovery effect. This makes the pre-membrane technology play an irreplaceable role in formation solution recovery, significantly improving the efficiency of the control system and the long-term stability of the membrane.

[0031] By regulating the temperature-sensitive polymer membrane through the temperature control unit 70 and the electric field adjustment unit 80, the control system can adjust the working mode of the temperature-sensitive polymer membrane in real time according to different pollution conditions of the formation solution. That is, the temperature control unit 70 and the electric field adjustment unit 80 change the pore size and charge distribution on the surface of the temperature-sensitive polymer membrane to meet the filtration needs of different concentrations of pollution and different ion concentrations. When the concentration of the formation solution is high, the temperature control unit 70 operates, causing the liquid temperature in the pre-membrane filter box 21 to decrease, activating the pore expansion function of the temperature-sensitive polymer membrane, increasing the pore size of the temperature-sensitive polymer membrane, thereby increasing the filtration flux and ensuring that the control system can handle higher concentrations of pollution. To prevent excessive clogging of the temperature-sensitive polymer membrane surface, the temperature reduction causes structural changes in the temperature-sensitive polymer membrane, increasing pore size and effectively removing larger particles and suspended solids. When the liquid is relatively clean, the control system controls the temperature regulation unit 70 to raise the liquid temperature in the pre-filter box 21, shrinking the pores of the temperature-sensitive polymer membrane and enhancing its ability to remove small molecule pollutants. Under conditions of high pollution, the electric field adjustment unit 80 enhances the charge adsorption capacity of the temperature-sensitive polymer membrane surface, specifically removing charged ions. When the ion concentration is low, the intensity of the electric field on the surface of the temperature-sensitive polymer membrane is weakened to avoid excessive adsorption of other dissolved substances and maintain the high-efficiency filtration of the temperature-sensitive polymer membrane.

[0032] During pre-filtration using the pre-membrane filter box 21, this invention, through the temperature control unit 70 and the electric field adjustment unit 80, enables the pre-membrane filter box 21 to flexibly adjust the porosity and charge characteristics of the temperature-sensitive polymer membrane according to different pollution conditions of the formation liquid, thereby achieving efficient pollutant removal. These two technologies work synergistically to flexibly respond to different pollution conditions. Based on changes in the concentration, conductivity, and type of pollutants in the formation liquid, the porosity and charge characteristics of the temperature-sensitive polymer membrane are adjusted accordingly. Specifically: Under high-concentration pollution conditions: The temperature is reduced by the temperature control unit 70, which increases the pore size of the temperature-sensitive polymer membrane and improves the filtration flux. This allows the temperature-sensitive polymer membrane to handle higher concentrations of pollutants, ensuring that large particulate pollutants can be effectively filtered. The increased pore size reduces membrane resistance and increases flow rate, thereby preventing membrane clogging caused by high concentrations of pollutants.

[0033] Low concentration contamination: The temperature is increased by 70 degrees Celsius through the temperature control unit, which reduces the membrane pore size, improves the separation accuracy, and reduces the adsorption of small molecules and harmless dissolved substances. This ensures more precise filtration of smaller molecules and dissolved substances. The smaller pore size can improve the membrane separation accuracy and prevent smaller dissolved substances and ions from being left unremoved.

[0034] High conductivity: The electric field adjustment unit 80 enhances the charge adsorption capacity of the temperature-sensitive polymer membrane, optimizing the membrane's removal efficiency of charged ions.

[0035] Low electrical conductivity: The electric field adjustment unit 80 weakens the charge adsorption capacity of the temperature-sensitive polymer membrane to avoid unnecessary membrane fouling.

[0036] In the formation liquid recovery control system, the pre-filter can adapt to different pollution conditions by flexibly adjusting its pore size and charge distribution, ensuring efficient filtration. This ensures that the temperature-sensitive polymer membrane can achieve the best filtration effect during the formation liquid recovery process. Under high concentrations of pollution, the pores of the temperature-sensitive polymer membrane expand, enhancing charge adsorption and adapting to high pollution loads. Under low concentrations of pollution, the pores of the temperature-sensitive polymer membrane shrink, improving separation accuracy and reducing membrane fouling. This technical solution enables intelligent adjustment of the temperature-sensitive polymer membrane during the formation liquid recovery process, ensuring efficient removal of pollutants and extending the service life of the temperature-sensitive polymer membrane.

[0037] The input end of the RO membrane filter box 22 is equipped with a third sensor group 213, which is responsible for real-time detection of the conductivity and ion concentration of the liquid entering the RO membrane. The RO membrane filter box 22 further removes dissolved ions and small molecule pollutants in the formation solution. The output end of the RO membrane filter box 22 is equipped with a fourth sensor group 214, which is used to monitor the quality of the effluent after RO membrane filtration, ensuring that the effluent liquid meets the predetermined standards and meets the recycling requirements. When the flow difference before and after the RO membrane filter box 22 exceeds the third threshold, the control system will start the clean water cleaning tank 60, introduce clean water into the RO membrane filter box 22 through the second cleaning pipe 210, backwash the RO membrane, clean the RO membrane, remove pollutants attached to the surface of the RO membrane, and restore the permeability of the RO membrane.

[0038] It is worth noting that in this invention, the control system can automatically adjust the working modes of the pre-filter box 21 and the RO membrane filter box 22 based on real-time detected concentration, conductivity, and impurity type data. Under different levels of contamination, the working modes of the pre-filter and RO membrane will automatically switch to adapt to changes in the formation solution. The control system determines the contamination level of the formation solution through data detected by the first sensor group 211. Under low concentration and low conductivity conditions, the pre-filter has a smaller effect, thus reducing its usage. The input end of the pre-filter box 21 is directly connected to the RO membrane filter box 22 via a branch pipe, and the branch pipe is equipped with… There is a valve. The control system controls the electrically controlled valve to close and the main valve to open, so that wastewater does not enter the pre-membrane filter box 21 through the inlet pipe 23, but is directly input into the RO membrane filter box 22 through the branch pipe. In this state, the RO membrane has a high working efficiency and can directly treat relatively clean liquids, removing ions and dissolved substances to produce pure formation solution. At this time, the operating pressure of the RO membrane is low and the water production efficiency is high. When the concentration of the formation solution is high, the control system controls the electrically controlled valve to open and the main valve to close, so that the formation solution enters the pre-membrane filter box 21 through the inlet pipe 23 for preliminary filtration. The specific control logic is as follows: The first sensor group 211 can detect the pressure difference in the pre-membrane filter box 21. The flow resistance of the cleaning liquid is small, and the pressure difference is small, while the flow resistance of the concentrate is large, and the pressure difference will be large. By detecting the pressure difference, it can be determined whether the liquid is a concentrate. The flow meter is installed on the product water pipe 25 and the backwash pipe 24. The flow meter can monitor the liquid flow in real time. When the pressure difference reaches the set threshold, the control system will control the opening and closing of the first solenoid valve 27 and the second solenoid valve 28 to adjust the flow direction, so that the cleaning liquid flows to the RO membrane filter box 22 and the concentrate flows to the storage tank 40. In addition, the conductivity sensor can detect the conductivity of the liquid in real time. The conductivity of the cleaning liquid is low, while the conductivity of the concentrate is high because it contains more dissolved ions. By observing the change in conductivity, the control system can determine the concentration of the liquid and adjust the flow direction accordingly.

[0039] Experimental data shows that by setting certain pressure difference, conductivity difference, and flow range, for example, when the pressure difference exceeds the preset value of 0.5 bar or the conductivity difference exceeds the preset value of 0.1 S / m, it is determined to be a concentrate. In this case, the first solenoid valve 27 is opened and the second solenoid valve 28 is closed, causing the liquid to flow to the storage tank 40.

[0040] In this embodiment, based on the specific variation patterns of flow difference and conductivity, different first thresholds, second thresholds, and third thresholds are set to ensure that the cleaning liquid and concentrate flow to the RO membrane filter box 22 and the storage tank 40, respectively. Specifically: The first threshold is used to determine the degree of clogging in the pre-membrane filter box 21. When the liquid flow difference exceeds this threshold, it indicates that the pollutant concentration in the pre-membrane filter box 21 is high. The control system starts the backwashing operation. Under a certain pollutant concentration, the membrane resistance increases and the flow difference increases accordingly.

[0041] The second threshold is used to determine whether the pre-membrane filter box 21 needs to be chemically cleaned. This threshold is higher than the first threshold and is suitable for cases with severe membrane clogging. This threshold can be set by testing the resistance change of the membrane under different concentrations of pollutants and the degree of membrane fouling.

[0042] The third threshold is used to determine the cleaning operation of the RO membrane filter box 22. It is suitable for detecting the increase in resistance of the RO membrane during the filtration process, based on the treatment efficiency and contaminant load of the RO membrane.

[0043] When the impurity concentration and conductivity of the formation solution are moderate, it indicates that there are a lot of impurities and ions in the liquid, but it is still within the treatment range. At this time, the formation solution may contain some smaller ions or organic matter, and the efficiency of the RO membrane is relatively low and it is easily contaminated. At this time, the control system controls the opening of the electronic control valve and the closing of the valve, causing the branch pipeline to close. Under this state, the role of the pre-membrane is more significant. The pre-membrane will treat most of the impurities, colloids and organic matter in the formation solution, reducing the entry of these contaminants into the RO membrane, thereby reducing the workload of the RO membrane and improving the treatment efficiency of the RO membrane. After the pre-membrane performs preliminary treatment, the RO membrane enters the fine purification stage to remove ions and small molecules in the formation solution.

[0044] When the concentration of impurities and the conductivity of the RO solution are high, it indicates that there are many ions and dissolved substances in the liquid, and there may be a large number of contaminants. At this time, the RO membrane faces greater operating pressure, which can easily lead to membrane clogging or shorten its lifespan. The control system controls the electronic control valve to close while the valve opens, using ultrafiltration or nanofiltration technology of the pre-filter to significantly remove impurities, colloidal substances and large molecular contaminants. By concentrating these contaminants, the pre-filter significantly reduces the load entering the RO membrane control system, enabling the RO membrane to process relatively clean liquids. During the RO membrane treatment process, the operating pressure of the RO membrane is monitored in real time to ensure that it operates within the appropriate working range and avoids damage to the membrane due to excessive pressure. At the same time, the RO membrane flushing frequency and cleaning intensity are adjusted, and the RO membrane is cleaned regularly to prevent clogging caused by the accumulation of contaminants.

[0045] The embodiments of the present invention can not only improve the efficiency of formation liquid recovery and reduce the energy consumption of the membrane control system, but also reduce manual intervention through automated adjustment, improve the stability and intelligence level of the control system. By setting sensors before and after the pre-membrane and RO membrane, various indicators of the formation liquid are monitored in real time to ensure that the membrane control system can always maintain the best working state under different pollution conditions, thereby maximizing the performance of the formation liquid recovery control system.

[0046] This embodiment discloses a method for recycling and utilizing formation liquid, which is implemented using formation liquid recycling and utilization equipment. The steps of the recycling and utilization method are as follows: S1: First, the formation liquid is simultaneously input into the first recovery unit 20 and the second recovery unit 30 through the wastewater tank 10. The first sensor group 211 detects the type, concentration, conductivity and flow rate of pollutants in the formation liquid in real time. The temperature control unit 70 and the electric field adjustment unit 80 adjust the pre-membrane filter box 21 according to the data detected by the first sensor group 211. The formation liquid is filtered through the pre-membrane filter box 21 to optimize the removal effect of suspended solids, ions and macromolecular pollutants in the formation liquid. S2: The second sensor group 212 performs real-time detection on the liquid filtered by the pre-membrane filter box 21 to detect the filtration effect of the pre-membrane filter box 21. The clean liquid flows to the RO membrane filter box 22 through the product water pipe 25, while the concentrate formed during the filtration process flows to the storage tank 40 through the backwash pipe 24. When the flow difference before and after the pre-membrane filter box 21 exceeds the first threshold, the backwashing operation is performed through the storage tank 40. When the flow difference before and after the pre-membrane filter box 21 exceeds the second threshold, the pre-membrane filter box 21 is chemically cleaned through the chemical cleaning tank 50 to remove contaminants from the surface of the intelligent polymer filter membrane. S3: The third sensor group 213 detects the conductivity and ion concentration of pollutants in the liquid input to the RO membrane filter box 22 in real time. The RO membrane filter box 22 further removes dissolved ions and small molecule pollutants in the liquid. The fourth sensor group 214 detects the effluent data of the RO membrane filter box 22 in real time to ensure that the effluent quality meets the standards. When the flow difference before and after the RO membrane filter box 22 exceeds the third threshold, the clean water cleaning box 60 is used for cleaning.

[0047] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A chemical reaction liquid recycling device, comprising a wastewater tank (10), wherein a first recycling unit (20) and a second recycling unit (30) are installed side-by-side and identically structured at the output end of the wastewater tank (10), characterized in that: The first recovery unit (20) includes a pre-membrane filter box (21), the outlet of the pre-membrane filter box (21) is connected to an RO membrane filter box (22) through a product water pipe (25), and the tail end of the pre-membrane filter box (21) is connected to a storage tank (40) through a backwash pipe (24). A chemical cleaning tank (50) is installed on the pre-membrane filter box (21), and a clean water cleaning tank (60) is installed on the RO membrane filter box (22). The input end of the pre-membrane filter box (21) is equipped with a first sensor group (211), the output end of the pre-membrane filter box (21) is equipped with a second sensor group (212), the input end of the RO membrane filter box (22) is equipped with a third sensor group (213), and the output end of the RO membrane filter box (22) is equipped with a fourth sensor group (214). The pre-membrane filter box (21) has a built-in multi-layer intelligent polymer filter membrane, and each intelligent polymer filter membrane is connected to a temperature control unit (70) via a wire, and each intelligent polymer filter membrane is connected to an electric field adjustment unit (80) via a wire.

2. The chemical reaction liquid recovery and utilization equipment according to claim 1, characterized in that: Each set of smart polymer filter membranes uses a temperature-sensitive polymer membrane.

3. The chemical reaction liquid recovery and utilization equipment according to claim 2, characterized in that: The input end of the pre-membrane filter box (21) is connected to the wastewater tank (10) through the water inlet pipe (23), the output end of the RO membrane filter box (22) is connected to the drain pipe (26), the backwash pipe (24) is fixedly equipped with the first solenoid valve (27), and the product water pipe (25) is fixedly equipped with the second solenoid valve (28).

4. The chemical reaction liquid recovery and utilization equipment according to claim 3, characterized in that: The chemical cleaning tank (50) has a built-in water pump, which is connected to the pre-membrane filter box (21) through the first cleaning pipe (29) for backwashing and cleaning the pre-membrane filter box (21).

5. The chemical reaction liquid recovery and utilization equipment according to claim 3, characterized in that: The clean water cleaning tank (60) has a built-in clean water pump, and the clean water pump is connected to the RO membrane filter box (22) through the second cleaning pipe (210) for backwashing and cleaning the RO membrane filter box (22).

6. The chemical reaction liquid recovery and utilization equipment according to claim 1, characterized in that: The first sensor group (211) and the second sensor group (212) incorporate an optical sensor, a conductivity sensor, an ion-selective electrode, and a flow meter.

7. The chemical formation liquid recovery and utilization equipment according to claim 1, characterized in that: The third sensor group (213) and the fourth sensor group (214) incorporate a conductivity sensor, an ion-selective electrode, and a flow meter.

8. A method for recycling a formation liquid, implemented using the formation liquid recycling equipment as described in claim 1, characterized in that: The steps of the recycling method are as follows: S1: First, the formation liquid is simultaneously input into the first recovery unit (20) and the second recovery unit (30) through the wastewater tank (10). The first sensor group (211) detects the type, concentration, conductivity and flow rate of pollutants in the formation liquid in real time. The temperature control unit (70) and the electric field adjustment unit (80) adjust the pre-membrane filter box (21) according to the data detected by the first sensor group (211). The formation liquid is filtered through the pre-membrane filter box (21) to optimize the removal effect of suspended solids, ions and macromolecular pollutants in the formation liquid. S2: The second sensor group (212) performs real-time detection on the liquid filtered by the pre-membrane filter box (21) to detect the filtration effect of the pre-membrane filter box (21). The clean liquid flows to the RO membrane filter box (22) through the product water pipe (25), while the concentrated liquid formed during the filtration process flows to the storage tank (40) through the backwash pipe (24). When the flow difference before and after the pre-membrane filter box (21) exceeds the first threshold, the backwash operation is performed through the storage tank (40). When the flow difference before and after the pre-membrane filter box (21) exceeds the second threshold, the pre-membrane filter box (21) is chemically cleaned through the chemical cleaning tank (50) to remove contaminants from the surface of the intelligent polymer filter membrane. S3: The third sensor group (213) detects the conductivity and ion concentration of pollutants in the liquid input to the RO membrane filter box (22) in real time. The RO membrane filter box (22) removes dissolved ions and small molecule pollutants in the liquid. The fourth sensor group (214) detects the effluent data of the RO membrane filter box (22) in real time to ensure that the effluent quality meets the standards. When the flow difference before and after the RO membrane filter box (22) exceeds the third threshold, the clean water cleaning box (60) is used for cleaning.

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