Membrane method system miniature simulation experiment device and application
By designing a micro-simulation experimental device for the membrane system, the problem of large errors in experimental results in the existing technology has been solved, and a rapid and accurate evaluation of the performance status and cleaning effect of membrane reagents has been achieved, which has improved the accuracy and efficiency of the experiment and is close to the simulation of real production conditions.
Patent Information
- Application Number
- CN202511109640.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-08
- Publication Date
- 2025-09-23
AI Technical Summary
Existing membrane system experimental methods cannot be carried out quickly, conveniently and accurately, resulting in large errors in experimental results, affecting the conclusion judgment, and cannot effectively simulate actual production conditions, especially the impact of multi-stage concentration and dynamic flow field is not taken into account.
A micro-simulation experimental device for a membrane system was designed, including an osmosis module, an experimental water tank, and a driving pump. Multiple osmosis modules were connected in series. Combined with QCM and EIS sensing devices, a monitoring module and data analysis were used to quickly evaluate the efficacy of membrane agents and verify the membrane cleaning effect.
The accuracy and efficiency of the experiment are improved, and the performance status and cleaning effect of membrane reagents can be evaluated quickly and accurately, which reduces experimental errors and simulates real production conditions.
Smart Images
Figure CN120679347A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a membrane system micro simulation experimental device and application thereof, belonging to the technical field of reverse osmosis. Background Art
[0002] Membrane systems are currently one of the most advanced methods in water treatment and are also the most widely used technology. They are used in a variety of applications, including conventional ultrapure water production, boiler water preparation, reclaimed water reuse, zero-emission salt separation, seawater desalination, and material concentration. Currently, operational and maintenance experiments in the industry are often difficult to conduct quickly, conveniently, accurately, and efficiently. Furthermore, existing experimental methods suffer from significant errors, which can affect conclusions. However, production activities will not be halted or shelved simply because experiments cannot be conducted quickly and efficiently. This would result in immeasurable indirect losses.
[0003] Existing experimental models often rely on static testing. Static scale inhibition tests (such as NACE TM0374) determine scale inhibition effectiveness by measuring conductivity mutation points, but they overlook the impact of dynamic flow fields. For example, using existing dynamic simulators for water quality simulations, raw water alone cannot reconstruct the user's raw water (because this raw water contains more than just ionic substances and its complex composition makes it difficult to reconstruct). If water is drawn from on-site, a significant amount of raw water (≥1m³) is required, and the experimental process uses existing dynamic equipment for water circulation. This makes it nearly impossible to address the resulting water temperature rise, pollutant attenuation, and evaporation (temperature can be reduced, but it fluctuates due to evaporation and water volume, making it difficult to maintain a stable level). Furthermore, existing micro-testing machines are only capable of single-diaphragm experiments and do not address multi-stage concentration simulations or dynamic flow field considerations.
[0004] Currently, there are three ways to conduct laboratory cleaning experiments on pollutants. The first is to conduct inference or static experiments after analyzing the pollutant components. However, since most pollutants are not single components and have complex compositions, the analytical methods are limited, the results have large errors, and the conclusions drawn are often off by a hair's breadth. The second is to use an offline cleaning machine to perform experimental cleaning on the membrane elements, but the experimental process is too inefficient and the reciprocating process is too costly. The third is a single-diaphragm buckle-type micro-test machine, which does not take into account the influence of the flow field, and the experimental device parameters are not accurate, resulting in inaccurate results. Therefore, the present invention is proposed to fill the gap in the industry's laboratory-grade reverse osmosis system fully constructed micro-concentration simulation test machine. Summary of the Invention
[0005] In response to the shortcomings of the existing technology, the present invention provides a micro-simulation experimental device for a membrane system and its application, which solves the current situation of insufficient verification of the effectiveness status of membrane agents (scaling inhibitors, reducing agents, bactericides, pH regulators) and realizes laboratory-level rapid evaluation of membrane cleaning.
[0006] The technical solutions of the present invention are as follows: A micro-simulation experimental device for a membrane method system includes an osmosis module, an experimental water tank, and a driving pump. Several osmosis modules are connected in series, and the first osmosis module is connected to the experimental water tank via the driving pump. The osmosis module includes a shell, a membrane and a support net. The support net is set inside the shell, and the interlayer collects the produced water. Membranes are set on both sides of the support net. The desalination layer of the membrane faces outward. A water inlet diamond guide grid is placed on the corresponding surface of the desalination layer of each membrane. The osmosis module is correspondingly provided with a water inlet, a concentrate inlet and a water production outlet. The osmosis module is connected to a QCM (quartz crystal microbalance) and an EIS (electrochemical impedance spectroscopy) sensing device through a signal line.
[0007] The initial recovery rate of the membrane block is set at 12.84%. The size is adjusted based on different experimental requirements, scenarios, stage ratios, and operating conditions to achieve optimal experimental parameters. The initial pressure of the drive pump is set between 0.7 and 1.55 MPa. The recovery rate is adjusted by controlling the valve size on the concentrate channel of each membrane block, taking into account the inlet flow rate, pressure, and the flow rate of the permeate channel of each membrane block.
[0008] Preferably, according to the present invention, the thickness of the guide grille is 0.813 mm, 0.711 mm or 0.864 mm, the opening rate of the guide grille is 38%, and the Reynolds number Re=320±15.
[0009] According to the preferred embodiment of the present invention, both the water inlet and the concentrated water outlet adopt transverse multi-hole double-row guide holes (such as Figure 3 The raw water is evenly distributed across the membrane surface (as shown). The produced water is collected, and the concentrated water enters the next permeation module for further concentration.
[0010] Preferably, according to the present invention, the water outlet connecting pipes of each osmosis module share a common flow channel, and a monitoring module A is provided on the flow channel outlet, the water inlet of each osmosis module and the concentrate outlet connecting pipe (in actual application, the shared pipe does not need to be designed with a separate monitoring module A. For example, if the concentrate outlet connecting pipe of the previous osmosis module and the water inlet connecting pipe of the next osmosis module are at the same observation point, then only one monitoring module A is designed), and a monitoring module B is provided on the water outlet connecting pipe. The monitoring module A includes a valve, a flow probe, a conductivity probe, a pressure probe, a temperature probe and a Ph probe. Among them, the monitoring module A on the water inlet connecting pipe of the first osmosis module connected in series is increased with a TOC (total organic carbon) probe and an ORP probe, and the other monitoring modules A remain unchanged. The monitoring module A and the monitoring module B are both connected to a data analysis module; Monitoring module B includes valve, flow probe, conductivity probe and Ph probe.
[0011] Preferably, according to the present invention, if the number of osmosis modules exceeds 12, a booster pump is added to the pipeline at the middle position to ensure pressurization for subsequent experiments.
[0012] Preferably, according to the present invention, the experimental device also includes a cleaning water tank, the water outlet of the cleaning water tank is connected to the water inlet of the first osmosis module through a cleaning water pump, the return water port of the cleaning water tank is connected to the water production port and the concentrated water port of the first osmosis module, and a monitoring module A is provided on the return water port connecting pipe of the cleaning water tank. Since the water production pipes of each osmosis module share a total flow channel, the free cleaning of each osmosis module can be achieved through valve control.
[0013] A heating device can be installed in the cleaning water tank to expand the functions of ultrasonic and air-water pulse devices to provide cleaning experimental conditions for subsequent cleaning experiments.
[0014] The application of the above membrane system micro-simulation experimental device to test and verify the scale inhibitor is as follows: (11) The experimental water (the inlet water of the experimental object reverse osmosis system or simulated water taken on site) mixed with the scale inhibitor is injected into the experimental water tank. The experimental water enters the osmosis module through the driving pump. At the beginning of the experiment, the inlet pressure is set to 1.0-1.55 MPa, and the recovery rate of the experimental device is set to 75% (here, simulation can be performed according to the number of module combinations and the actual field operation recovery rate); (12) The running time was set to 12 h, 24 h, 48 h, and 72 h, and four experiments were conducted respectively to observe the mass changes of the membranes in the last three permeation modules. The mass change error was set to 0.1%; There are two methods for observing changes in membrane mass. First, the membrane is weighed using an analytical balance before placement. After the experiment, the membrane is dried and weighed again. The mass change is then compared. The growth change over four experiments can be evaluated. Second, a quartz crystal microbalance is placed on the membrane block to directly measure mass changes online.
[0015] Under the premise that the temperature, conductivity and pressure values monitored at the water inlet of the first permeation module remain constant, if the mass of the membrane of the 12th permeation module increases by more than 0.1% or the flow rate at the water outlet decreases by more than 0.1%, any of these conditions will be triggered and it will be preliminarily judged as scaling; (13) Combined with the monitoring data at the water inlet and flow channel outlet of the first osmosis module; the quality change trend of the last three osmosis modules and the monitoring data of the water outlet and the concentrate outlet, the membrane fouling rate in actual production is calculated, and the fouling type is judged and studied by referring to the surface pollutant analysis of the membrane of the osmosis module.
[0016] The application of the above membrane system micro-simulation experimental device to test and verify the compatibility of multiple drug combinations is as follows: (21) Blank experiment: The experimental water is subjected to static scale inhibition screening (the inlet water of the experimental object reverse osmosis system or simulated water taken on site), and only 3-5ppm of scale inhibitor is injected into the experimental water tank. The experimental water enters the osmosis module through the driving pump. At the beginning of the experiment, the inlet pressure is set to 1.0-1.55MPA (or restore the on-site setting). The flow rate is controlled by adjusting the valve at the outlet of the flow channel and the concentrate outlet of the last osmosis module. The recovery rate of the experimental device is set to 75% (or simulated according to the number of module combinations and the actual on-site operation recovery rate); (22) Experiment 1: The experimental water (the inlet water of the experimental object's reverse osmosis system or simulated water taken on site) and the drugs in the reduction site ratio were injected into the experimental water tank; the experimental water was driven by the pump and fed into the water osmosis module. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55 MPa and the recovery rate was set to 75%; (23) The running time was set to 12 h, 24 h, 48 h, and 72 h, and four experiments were conducted to observe the changes in the mass of the membrane in the first osmosis module, the middle two osmosis modules, and the last module. The mass change error was set to 0.1%. Under the premise that the temperature, conductivity, and pressure values monitored at the water inlet of the first osmosis module were constant, compared with the blank experiment, in Experiment 1, the mass of the membrane in the first osmosis module, the middle two osmosis modules, and the last module increased by more than 0.1% compared with the blank experiment; the pressure difference of the adjacent detection points of the first osmosis module, the middle two osmosis modules, and the last module increased by more than 0.15% or the flow rate decreased by more than 0.2%. If any of the conditions was triggered, it was judged that the reagents were incompatible; (24) Further experimental judgment and research were conducted based on the monitoring data information of the first permeation module, the two middle permeation modules and the last module, the quality change trend ratio and the analysis of the surface material of the module membrane.
[0017] The application of the above membrane system micro-simulation experimental device to test and verify the chemical cleaning effect is as follows: (31) Pre-cleaning experiment: The experimental water is subjected to static scale inhibition screening (the inlet water of the experimental object reverse osmosis system or simulated water taken on site), and only 3-5ppm of scale inhibitor is injected into the experimental water tank; the experimental water enters the osmosis module through the driving pump, and the experiment starts. The water inlet pressure is set to 1.0-1.55MPA, and the contaminated membrane is placed in the first osmosis module. The recovery rate is set to 75%, and the three monitoring data of the first osmosis module are recorded for use; (32) Cleaning experiment: Prepare the cleaning liquid in the cleaning water tank; start the cleaning water pump, close the valve at the outlet of the first osmosis module and the valve at the water inlet of the second osmosis module, and clean the first osmosis module. The cleaning time can be set to 6h, 8h, 12h or 24h. The flow rate can be adjusted according to the situation during cleaning. After cleaning, empty the cleaning water tank and inject clean water to rinse the membrane; (33) Verification experiment after cleaning: The experimental water was subjected to static scale inhibition screening, and only 3-5ppm of scale inhibitor was injected into the experimental water tank; the experimental water was driven by a driving pump. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55MPA, and the recovery rate was set to 75%. The three monitoring data of the first permeation module were recorded and compared with the experimental record data before cleaning to verify the cleaning effect. At the same time, the weight loss of the membrane before and after cleaning was compared. Under the premise that the desalination rate of the membrane remained unchanged, the greater the weight loss and the higher the flow rate, the better the cleaning effect was.
[0018] The application of the above membrane system micro-simulation experimental device to test and verify the optimal operation of the membrane system is as follows: (41) Blank experiment: inject the experimental water into the experimental water tank in Figure 2.1; the experimental water is driven by the driving pump. At the beginning of the experiment, set the water inlet pressure to 1.0-1.55 MPa, the recovery rate to 75%, the running time to 6-12 hours, and record the summary data for later use; (42) Experiment ①: Inject the experimental water and the chemicals used in Experiment ① into the experimental water tank according to the preset ratio. The experimental water is driven by the driving pump. At the beginning of the experiment, set the water inlet pressure to 1.0-1.55MPA and the recovery rate to 75%. Record the data for later use.
[0019] (43) Experiment ②: Inject the experimental water and the chemicals used in Experiment ② into the experimental water tank according to the preset ratio; the experimental water is driven by the driving pump. When the experiment starts, set the water inlet pressure to 1.0-1.55MPA and record the data for later use; (44) According to the experimental method described in steps (42) and (43), different scale inhibitors, reducing agents, and non-oxidizing bactericides are introduced in turn. The best chemicals are screened out according to the pressure changes, water attenuation, and membrane quality changes. The more stable the pressure, the smaller the water attenuation cycle and amplitude, and the smaller the quality change, the better the effect.
[0020] The application of the above membrane system micro-simulation experimental device to test and verify the performance of membrane elements is as follows: (51) Inject the experimental water into the experimental water tank, cut and manufacture the membrane element for the target experiment, and place it in the permeation module; the experimental water is driven by the driving pump, and the experiment starts, setting the water inlet pressure to 1.0-1.55 MPa and the recovery rate to 75%; (52) Experiment I: Observe the monitoring data at the water inlet of the first osmosis module, the concentrate outlet of the last osmosis module, and the outlet of the flow channel to preliminarily judge the membrane desalination performance and water production rate performance (the desalination rate refers to the ratio of the inlet water conductivity to the product water conductivity. Each adjacent position of each membrane block is equipped with a conductivity probe point, which can be calculated by taking the data. The water production rate is generally referred to as the change in water volume in the water production channel. The conventional calculation method is not repeated here). Based on the changes in the flow rate and conductivity data monitored at the water production outlets of all osmosis modules and the water inlet of the first osmosis module, judge the membrane data status. A decrease in flow rate indicates the presence of pollutants, and a high conductivity indicates that the membrane is damaged. (53) Experiment II: Set the operating time to 12h, 24h, 48h, 72h, and 168h, conduct 5 experiments, observe the changes in all pressure data, flow data, and conductivity data, and draw conclusions about the operating cycle time.
[0021] The beneficial effects of the present invention are: The fundamental purpose of this invention is to solve the operational failures and experimental research verification problems of membrane systems that change reverse osmosis and nanofiltration membranes, promote the analysis and research of the hardware and operation of membrane systems, and indirectly contribute to the development of the industry.
[0022] Restore the real-world structural devices, set fixed size parameters, adjustment ranges, combination associations, and logical sequences. Based on hardware, add data exploration points, collect and summarize data information, and then use logical methods and data analysis to draw conclusions and improve the efficiency and accuracy of existing simulations. Specific improvements include: The structural design within a single module incorporates a diamond-shaped water inlet grid to restore on-site flow channel equivalence.
[0023] A method of conducting experiments based on a device and drawing experimental conclusions by comparing changes in diaphragm mass.
[0024] Data collection points and types.
[0025] All data logic and judgment methods based on the application of this device. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a schematic structural diagram of Example 1 of the present invention; Figure 2 This is a schematic structural diagram of Example 2 of the present invention; Figure 3 Schematic diagram of the components of the infiltration module of the present invention.
[0027] Among them: 1. Osmosis module; 2. Experimental water tank; 3. Drive pump; 4. Monitoring module A; 5. Monitoring module B; 6. Signal line; 7. Cleaning water tank; 8. Cleaning water pump; 9. Booster pump; 10. Flow channel; 101. Diaphragm; 102. Support mesh; 103. Guide grid; 104. Water inlet; 105. Concentrate outlet; 106. Water outlet. DETAILED DESCRIPTION
[0028] The present invention will be further described below with reference to embodiments and accompanying drawings, but is not limited thereto.
[0029] Example 1: like Figure 1 As shown, this embodiment provides a membrane system micro-simulation experimental device, including an osmosis module 1, an experimental water tank 2 and a driving pump 3. Several osmosis modules 1 are connected in series, and the first osmosis module is connected to the experimental water tank 2 through the driving pump; The osmosis module 1 includes a housing, a membrane 101 and a support net 102. Figure 3 As shown, a support net 102 is provided in the shell, and the interlayer collects the produced water. Membranes 101 are provided on both sides of the support net 102, and the desalination layer of the membrane 101 faces outward. A water inlet diamond guide grid 103 is placed on each surface corresponding to the desalination layer of the two membranes. The osmosis module 1 is correspondingly provided with a water inlet 104, a concentrate outlet 105 and a water outlet 106. The osmosis module 1 is connected to a QCM (quartz crystal microbalance) and an EIS (electrochemical impedance spectroscopy) sensing device through a signal line.
[0030] The initial recovery rate of the membrane block is set at 12.84%. The size is adjusted based on different experimental requirements, scenarios, stage ratios, and operating conditions to achieve optimal experimental parameters. The initial pressure of the drive pump is set between 0.7 and 1.55 MPa. The recovery rate is adjusted by controlling the valve size on the concentrate channel of each membrane block, taking into account the inlet flow rate, pressure, and the flow rate of the permeate channel of each membrane block.
[0031] The thickness of the guide grille 103 is 0.813 mm, 0.711 mm or 0.864 mm, the opening rate of the guide grille is 38%, and the Reynolds number Re=320±15.
[0032] The water inlet 104 and the concentrated water outlet 105 are both equipped with transverse multi-hole double-row guide holes (such as Figure 3 The raw water is evenly distributed across the membrane surface (as shown). The produced water is collected, and the concentrated water enters the next permeation module for further concentration.
[0033] The water outlet 106 connecting pipes of each osmosis module 1 share a common flow channel 10. A monitoring module A4 is provided on the connecting pipes of the flow channel 10 outlet, the water inlet 104 of each osmosis module, and the concentrate outlet 105 (in actual application, a separate monitoring module A is not designed for the shared pipe. For example, if the concentrate outlet connecting pipe of the previous osmosis module and the water inlet connecting pipe of the next osmosis module are at the same observation point, only one monitoring module A is required). A monitoring module B5 is provided on the connecting pipe of the water outlet 106. The monitoring module A4 includes a valve, a flow probe, a conductivity probe, a pressure probe, a temperature probe, and a Ph probe. Among them, the monitoring module A on the water inlet connecting pipe of the first osmosis module in series is equipped with a TOC (total organic carbon) probe and an ORP probe. The other monitoring modules A remain unchanged. Both the monitoring module A and the monitoring module B are connected to a data analysis module. Monitoring module B5 includes valve, flow probe, conductivity probe and Ph probe.
[0034] There are 15 infiltration modules, and a booster pump 9 is added to the pipeline in the middle position to ensure the pressure increase for subsequent experiments.
[0035] Example 2: like Figure 2 As shown, this embodiment provides a micro-simulation experimental device for a membrane system, and its structure is as described in Example 1, except that the experimental device further includes a cleaning water tank 7, and the water outlet of the cleaning water tank 7 is connected to the water inlet 104 and the concentrate outlet of the first osmosis module through a cleaning water pump 8, and the return water port of the cleaning water tank 7 is connected to the water production port 106 of the first osmosis module. A monitoring module A4 is provided on the connection pipe of the return water port of the cleaning water tank. Since the water production pipes of each osmosis module share a common flow channel, the free cleaning of each osmosis module can be achieved through valve control.
[0036] A heating device can be installed in the cleaning water tank to expand the functions of ultrasonic and air-water pulse devices to provide cleaning experimental conditions for subsequent cleaning experiments.
[0037] Example 3: This embodiment provides an application of the membrane system micro-simulation experimental device described in Example 2 to test and verify the scale inhibitor. The steps are as follows: (11) The experimental water (the inlet water of the experimental object reverse osmosis system or simulated water taken on site) mixed with the scale inhibitor is injected into the experimental water tank. The experimental water enters the osmosis module through the driving pump. At the beginning of the experiment, the inlet pressure is set to 1.0-1.55 MPa, and the recovery rate of the experimental device is set to 75% (here, simulation can be performed according to the number of module combinations and the actual field operation recovery rate); (12) The running time was set to 12 h, 24 h, 48 h, and 72 h, and four experiments were conducted respectively to observe the mass changes of the membranes in the last three permeation modules. The mass change error was set to 0.1%; The mass change of the diaphragm can be observed in two ways. The first is to weigh and record the diaphragm with an analytical balance before putting it in. After the experiment, it is dried and weighed again. The mass change is obtained by comparing the data before and after. The growth change of the four experiments can be evaluated. The second method is to set up a quartz crystal microbalance on the membrane block to directly measure the mass change online.
[0038] Under the premise that the temperature, conductivity and pressure values monitored at the water inlet of the first permeation module remain constant, if the mass of the membrane of the last permeation module increases by more than 0.1% or the flow rate at the water outlet decreases by more than 0.1%, any of these conditions will be triggered, and scaling will be preliminarily determined. (13) Combined with the monitoring data at the water inlet and flow channel outlet of the first osmosis module, the quality change trend of the last three osmosis modules and the corresponding monitoring data of the water outlet and concentrate outlet, the membrane fouling rate in actual production was calculated, and the fouling type was judged and studied with reference to the analysis of the pollutants on the membrane surface of the osmosis module.
[0039] Example 4: This embodiment provides an application of the membrane method system micro-simulation experimental device described in Example 2 to test and verify the compatibility of multiple drug combinations. The steps are as follows: (21) Blank experiment: The experimental water is subjected to static scale inhibition screening (the inlet water of the experimental object reverse osmosis system or simulated water taken on site), and only 3-5ppm of scale inhibitor is injected into the experimental water tank. The experimental water enters the osmosis module through the driving pump. At the beginning of the experiment, the inlet pressure is set to 1.0-1.55MPA (or restore the on-site setting). The flow rate is controlled by adjusting the valve at the outlet of the flow channel and the concentrate outlet of the last osmosis module. The recovery rate of the experimental device is set to 75% (or simulated according to the number of module combinations and the actual on-site operation recovery rate); (22) Experiment 1: The experimental water (the inlet water of the experimental object's reverse osmosis system or simulated water taken on site) and the drugs in the reduction site ratio were injected into the experimental water tank; the experimental water was driven by the pump and fed into the water osmosis module. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55 MPa and the recovery rate was set to 75%; (23) The running time was set to 12 h, 24 h, 48 h, and 72 h, and four experiments were conducted to observe the changes in the mass of the membrane in the first permeation module, the middle two permeation modules, and the last module. The mass change error was set to 0.1%. Under the premise that the temperature, conductivity, and pressure values monitored at the water inlet of the first permeation module were constant, compared with the blank experiment, in Experiment 1, the mass of the membrane in the first permeation module, the middle two permeation modules, and the last module increased by more than 0.1% compared with the blank experiment; the pressure difference of the adjacent detection points of the first permeation module, the middle two permeation modules, and the last module increased by more than 0.15% or the flow rate decreased by more than 0.2%. If any of the conditions was triggered, it was judged that the reagent was incompatible; (24) Further experimental judgment and research were conducted based on the monitoring data information of the first permeation module, the two middle permeation modules and the last module, the quality change trend ratio and the analysis of the surface material of the module membrane.
[0040] Example 5: This embodiment provides an application of the membrane system micro-simulation experimental device described in Example 2 to test and verify the chemical cleaning effect. The steps are as follows: (31) Pre-cleaning experiment: The experimental water is subjected to static scale inhibition screening (the inlet water of the experimental object reverse osmosis system or simulated water taken on site), and only 3-5ppm of scale inhibitor is injected into the experimental water tank; the experimental water enters the osmosis module through the driving pump, and the experiment starts. The water inlet pressure is set to 1.0-1.55MPA, and the contaminated membrane is placed in the first osmosis module. The recovery rate is set to 75%, and the three monitoring data of the first osmosis module are recorded for use; (32) Cleaning experiment: Prepare the cleaning liquid in the cleaning water tank; start the cleaning water pump, close the valve at the outlet of the first osmosis module and the valve at the water inlet of the second osmosis module, and clean the first osmosis module. The cleaning time can be set to 6h, 8h, 12h or 24h. The flow rate can be adjusted according to the situation during cleaning. After cleaning, empty the cleaning water tank and inject clean water to rinse the membrane; (33) Verification experiment after cleaning: The experimental water was subjected to static scale inhibition screening, and only 3-5ppm of scale inhibitor was injected into the experimental water tank; the experimental water was driven by a driving pump. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55MPA, and the recovery rate was set to 75%. The three monitoring data of the first permeation module were recorded and compared with the experimental record data before cleaning to verify the cleaning effect. At the same time, the weight loss of the membrane before and after cleaning was compared. Under the premise that the desalination rate of the membrane remained unchanged, the greater the weight loss and the higher the flow rate, the better the cleaning effect was.
[0041] Example 6: This embodiment provides an application of the membrane system micro-simulation experimental device described in Example 2 to test and verify the optimal operation of the membrane system. The steps are as follows: (41) Blank experiment: inject the experimental water into the experimental water tank in Figure 2.1; the experimental water is driven by the driving pump. At the beginning of the experiment, set the water inlet pressure to 1.0-1.55 MPa, the recovery rate to 75%, the running time to 6-12 hours, and record the summary data for later use; (42) Experiment ①: Inject the experimental water and the chemicals used in Experiment ① into the experimental water tank according to the preset ratio. The experimental water is driven by the driving pump. At the beginning of the experiment, set the water inlet pressure to 1.0-1.55MPA and the recovery rate to 75%. Record the data for later use.
[0042] (43) Experiment ②: Inject the experimental water and the chemicals used in Experiment ② into the experimental water tank according to the preset ratio; the experimental water is driven by the driving pump. When the experiment starts, set the water inlet pressure to 1.0-1.55MPA and record the data for later use; (44) According to the experimental method described in steps (42) and (43), different scale inhibitors, reducing agents, and non-oxidizing bactericides are introduced in turn. The best chemicals are screened out according to the pressure changes, water attenuation, and membrane quality changes. The more stable the pressure, the smaller the water attenuation cycle and amplitude, and the smaller the quality change, the better the effect.
[0043] Example 7: This embodiment provides an application of the membrane system micro-simulation experimental device described in Example 2 to test and verify the performance of membrane elements. The steps are as follows: (51) Inject the experimental water into the experimental water tank, cut and manufacture the membrane element for the target experiment, and place it in the permeation module; the experimental water is driven by the driving pump, and the experiment starts, setting the water inlet pressure to 1.0-1.55 MPa and the recovery rate to 75%; (52) Experiment I: Observe the monitoring data at the water inlet of the first osmosis module, the concentrate outlet of the last osmosis module, and the outlet of the flow channel to preliminarily judge the membrane desalination performance and water production rate performance (the desalination rate refers to the ratio of the inlet water conductivity to the product water conductivity. Each adjacent position of each membrane block is equipped with a conductivity probe point, which can be calculated by taking the data. The water production rate is generally referred to as the change in water volume in the water production channel. The conventional calculation method is not repeated here). Based on the changes in the flow rate and conductivity data monitored at the water production outlets of all osmosis modules and the water inlet of the first osmosis module, judge the membrane data status. A decrease in flow rate indicates the presence of pollutants, and a high conductivity indicates that the membrane is damaged. (53) Experiment II: Set the operating time to 12h, 24h, 48h, 72h, and 168h, conduct 5 experiments, observe the changes in all pressure data, flow data, and conductivity data, and draw conclusions about the operating cycle time.
Claims
1. A micro-simulation experimental device for a membrane method system, characterized in that: It includes an osmosis module, an experimental water tank and a driving pump. Several osmosis modules are connected in series, and the first osmosis module is connected to the experimental water tank through the driving pump. The osmosis module includes a shell, a membrane and a support net. The support net is arranged inside the shell, and membranes are arranged on both sides of the support net. The desalination layer of the membrane faces outward. A water inlet diamond guide grid is placed on each surface corresponding to the desalination layer of the two membranes. The osmosis module is correspondingly provided with a water inlet, a concentrate outlet and a water production outlet. The osmosis module is connected to the QCM and EIS sensing devices through signal lines.
2. The micro-simulation experimental device of the membrane method system according to claim 1, characterized in that: The thickness of the guide grille is 0.813mm, 0.711mm or 0.864mm, the opening rate of the guide grille is 38%, and the Reynolds number Re=320±15.
3. The micro-simulation experimental device of the membrane method system according to claim 2, characterized in that: Both the water inlet and the concentrated water outlet adopt transverse multi-hole double-row diversion holes.
4. The micro-simulation experimental device of the membrane method system according to claim 3, characterized in that: The water outlet connecting pipes of each osmosis module share a common flow channel. Monitoring module A is installed on the flow channel outlet, the water inlet of each osmosis module, and the concentrated water outlet connecting pipe. Monitoring module B is installed on the water outlet connecting pipe. Monitoring module A includes a valve, a flow probe, a conductivity probe, a pressure probe, a temperature probe, and a Ph probe. Among them, the monitoring module A on the water inlet connecting pipe of the first osmosis module connected in series is additionally equipped with a TOC probe and an ORP probe. Both monitoring module A and monitoring module B are connected to a data analysis module. Monitoring module B includes valve, flow probe, conductivity probe and Ph probe; If the number of permeation modules exceeds 12, a booster pump is added to the pipeline in the middle.
5. The micro-simulation experimental device of the membrane method system according to claim 4, characterized in that: The experimental device also includes a cleaning water tank. The water outlet of the cleaning water tank is connected to the water inlet of the first osmosis module through a cleaning water pump. The return water outlet of the cleaning water tank is connected to the water production outlet and the concentrated water outlet of the first osmosis module. A monitoring module A is installed on the return water outlet connecting pipe of the cleaning water tank.
6. The application of the membrane system micro-simulation experimental device according to claim 5, characterized in that: The steps for testing and verifying the antiscalant are as follows: (11) The experimental water mixed with the scale inhibitor is injected into the experimental water tank. The experimental water enters the permeation module through the driving pump. When the experiment starts, the water inlet pressure is set to 1.0-1.55 MPa, and the recovery rate of the experimental device is set to 75%; (12) The running time was set to 12 h, 24 h, 48 h, and 72 h, and four experiments were conducted respectively to observe the changes in the membrane quality in the last three permeation modules; Under the premise that the temperature, conductivity and pressure values monitored at the water inlet of the first permeation module remain constant, if the mass of the membrane of the last permeation module increases by more than 0.1% or the flow rate at the water outlet decreases by more than 0.1%, any of these conditions will be triggered, and scaling will be preliminarily determined. (13) Combined with the monitoring data at the water inlet and flow channel outlet of the first osmosis module, the quality change trend of the last three osmosis modules and the monitoring data at the water outlet and concentrate outlet, the membrane fouling rate in actual production was calculated, and the type of scaling was judged and studied by referring to the surface pollutant analysis of the membrane of the osmosis module.
7. The application of the membrane system micro-simulation experimental device according to claim 5, characterized in that: The steps for testing and verifying the compatibility of multiple drug combinations are as follows: (21) Blank experiment: The experimental water was subjected to static scale inhibition screening, and only 3-5 ppm of scale inhibitor was injected into the experimental water tank. The experimental water entered the permeation module through the driving pump. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55 MPa, and the recovery rate of the experimental device was set to 75%; (22) Experiment 1: The experimental water and the drugs in the reduction site ratio were injected into the experimental water tank; the experimental water was driven by the pump and entered the water infiltration module. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55 MPa and the recovery rate was set to 75%; (23) The running time was set to 12 h, 24 h, 48 h, and 72 h, and four experiments were conducted to observe the changes in the mass of the membrane in the first osmosis module, the middle two osmosis modules, and the last module. Under the premise that the temperature, conductivity, and pressure values monitored at the water inlet of the first osmosis module were constant, compared with the blank experiment, in Experiment 1, the mass of the membrane in the first osmosis module, the middle two osmosis modules, and the last module increased by more than 0.1% compared with the blank experiment; the pressure difference of the adjacent detection points of the first osmosis module, the middle two osmosis modules, and the last module increased by more than 0.15% or the flow rate decreased by more than 0.2%. If any of the conditions was triggered, it was judged that the reagents were incompatible; (24) Further experimental judgment and research were conducted based on the monitoring data information of the first permeation module, the two middle permeation modules and the last module, the quality change trend ratio and the analysis of the surface material of the module membrane.
8. The application of the membrane system micro-simulation experimental device according to claim 5, characterized in that: To test and verify the effect of chemical cleaning, the steps are as follows: (31) Pre-cleaning experiment: The experimental water was subjected to static scale inhibition screening, and only 3-5 ppm of scale inhibitor was injected into the experimental water tank; the experimental water entered the osmosis module through the driving pump, and the experiment started. The water inlet pressure was set to 1.0-1.55 MPa, and the contaminated membrane was placed in the first osmosis module. The recovery rate was set to 75%, and the three monitoring data of the first osmosis module were recorded for later use; (32) Cleaning experiment: Prepare cleaning liquid in the cleaning water tank; start the cleaning water pump, close the valve at the outlet of the first osmosis module and the valve at the water inlet of the second osmosis module, and clean the first osmosis module. The cleaning time is set to 6h, 8h, 12h or 24h. After the cleaning is completed, empty the cleaning water tank and inject clean water to rinse the membrane; (33) Verification experiment after cleaning: The experimental water was subjected to static scale inhibition screening, and only 3-5ppm of scale inhibitor was injected into the experimental water tank; the experimental water was driven by a driving pump. At the beginning of the experiment, the water inlet pressure was set to 1.0-1.55MPA, and the recovery rate was set to 75%. The three monitoring data of the first permeation module were recorded and compared with the experimental record data before cleaning to verify the cleaning effect. At the same time, the weight loss of the membrane before and after cleaning was compared. Under the premise that the desalination rate of the membrane remained unchanged, the greater the weight loss and the higher the flow rate, the better the cleaning effect was.
9. The application of the membrane system micro-simulation experimental device according to claim 5, characterized in that: To test and verify the optimal operation of the membrane system, the steps are as follows: (41) Blank experiment: inject the experimental water into the experimental water tank in Figure 2.1; the experimental water is driven by the driving pump. At the beginning of the experiment, set the water inlet pressure to 1.0-1.55 MPa, the recovery rate to 75%, the running time to 6-12 hours, and record the summary data for later use; (42) Experiment ①: Inject the experimental water and the chemicals used in Experiment ① into the experimental water tank according to the preset ratio. The experimental water is driven by the driving pump. When the experiment starts, set the water inlet pressure to 1.0-1.55 MPa and the recovery rate to 75%. Record the data for later use. (43) Experiment ②: Inject the experimental water and the chemicals used in Experiment ② into the experimental water tank according to the preset ratio; the experimental water is driven by the driving pump. When the experiment starts, set the water inlet pressure to 1.0-1.55MPA and record the data for later use; (44) According to the experimental method described in steps (42) and (43), different scale inhibitors, reducing agents, and non-oxidizing bactericides are introduced in turn. The best chemicals are screened out according to the pressure changes, water attenuation, and membrane quality changes. The more stable the pressure, the smaller the water attenuation cycle and amplitude, and the smaller the quality change, the better the effect.
10. Application of the membrane system micro-simulation experimental device according to claim 5, characterized in that: The steps for testing and verifying the performance of membrane elements are as follows: (51) Inject the experimental water into the experimental water tank, cut and manufacture the membrane element for the target experiment, and place it in the permeation module; the experimental water is driven by the driving pump, and the experiment starts, setting the water inlet pressure to 1.0-1.55 MPa and the recovery rate to 75%; (52) Experiment I: Observe the monitoring data at the water inlet of the first osmosis module, the concentrate outlet of the last osmosis module, and the outlet of the flow channel to preliminarily judge the membrane desalination performance and water production rate performance (the desalination rate refers to the ratio of the inlet water conductivity to the product water conductivity. Each adjacent position of each membrane block is equipped with a conductivity probe point, which can be calculated by taking the data. The water production rate is generally referred to as the change in water volume in the water production channel. The conventional calculation method is not repeated here). Based on the changes in the flow rate and conductivity data monitored at the water production outlets of all osmosis modules and the water inlet of the first osmosis module, judge the membrane data status. A decrease in flow rate indicates the presence of pollutants, and a high conductivity indicates that the membrane is damaged. (53) Experiment II: Set the operating time to 12h, 24h, 48h, 72h, and 168h, conduct 5 experiments, observe the changes in all pressure data, flow data, and conductivity data, and draw conclusions about the operating cycle time.