Membrane concentration system

Abstract

The utility model relates to the technical field of membrane concentration equipment, and provides a membrane concentration system which comprises a stock solution tank, a stock solution feeding pipeline, a stock solution discharging pipeline, a membrane component, a stock solution return pipeline and a permeate liquid discharging pipeline, the stock solution feeding pipeline is communicated with the stock solution tank, the stock solution tank is communicated with the membrane assembly through the stock solution discharging pipeline, the membrane assembly is communicated with the stock solution tank through the stock solution return pipeline, and the permeate discharging pipeline is communicated with the membrane assembly; wherein the stock solution discharging pipeline is provided with a first solid content measuring instrument, the stock solution discharging pipeline is communicated with a concentrated solution discharging branch, and under the condition that the solid content value of the first solid content measuring instrument is equal to a target solid content value, the concentrated solution discharging branch is opened. Therefore, by monitoring the material concentration in real time and automatically judging the concentration end point, the automatic operation of the concentration process of the microbial fermentation liquor is realized, and the stability and consistency of products are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to membrane concentration equipment technical field especially relates to a membrane concentration system. BACKGROUND

[0002] In the field of microbial fermentation, the purification process is a key link to obtain high-purity target products, and the concentration treatment of the extract is particularly important. At present, the membrane assembly separation technology is widely used in the industry to achieve efficient concentration of the extract. This technology has been widely used due to its high separation efficiency and low energy consumption. However, the judgment of the concentration endpoint in the existing process still relies on manual sampling detection. This traditional method is easily affected by factors such as differences in operator experience and insufficient sampling representativeness, making it difficult to ensure the accuracy and consistency of the concentration endpoint judgment, which may further affect the stability of product quality. SUMMARY

[0003] The utility model provides a kind of membrane concentration system, and it aims at solving the problem of lack of accuracy and poor consistency caused by concentration endpoint judgment relying on manual sampling detection in prior art.

[0004] The utility model provides a kind of membrane concentration system, raw liquid tank, raw liquid feed line, raw liquid discharge line, membrane assembly, raw liquid return line and permeate discharge line;

[0005] The raw liquid feed line is communicated with the raw liquid tank, and the raw liquid tank is communicated with the membrane assembly through the raw liquid discharge line, and the membrane assembly is communicated with the raw liquid tank through the raw liquid return line, and the permeate discharge line is communicated with the membrane assembly;Wherein, the raw liquid discharge line is provided with first solid content measuring instrument, and the raw liquid discharge line is communicated with concentrated liquid discharge branch, and in the case that the solid content value of the first solid content measuring instrument is equal to the target solid content value, the concentrated liquid discharge branch is opened.

[0006] According to the membrane concentration system provided by the utility model, the raw liquid discharge line is also provided with a first pneumatic on-off valve, and along the material flow direction of the raw liquid discharge line, the first pneumatic on-off valve is located on the downstream side of the first solid content measuring instrument;The communication point of the concentrated liquid discharge branch on the raw liquid discharge line is located between the first solid content measuring instrument and the first pneumatic on-off valve.

[0007] According to the membrane concentration system provided by the utility model, the raw liquid discharge line is also provided with a pump body and a first pressure transmitter, and along the material flow direction of the raw liquid discharge line, the pump body, the first solid content measuring instrument and the first pressure transmitter are sequentially arranged;The raw liquid return line is provided with a second pressure transmitter and a first pneumatic regulating valve, and along the material flow direction of the raw liquid return line, the second pressure transmitter and the first pneumatic regulating valve are sequentially arranged.

[0008] According to the membrane concentration system provided by this utility model, the feed liquid return pipeline is further provided with a heat exchange pipeline. Along the material flow direction of the feed liquid return pipeline, the heat exchange pipeline is located downstream of the first pneumatic regulating valve, and the heat exchange pipeline is configured to adjust the temperature of the material flowing through the feed liquid return pipeline.

[0009] According to the present invention, a membrane concentration system is provided, wherein the heat exchange pipeline includes a cooler, a first coolant branch and a second coolant branch, the cooler has a material channel and a coolant channel, the material channel is connected to the raw liquid return pipeline, and the first coolant branch and the second coolant branch are both connected to the coolant channel.

[0010] According to the membrane concentration system provided by this utility model, the first coolant branch is provided with a second pneumatic switch valve and a second pneumatic regulating valve, and the second pneumatic switch valve and the second pneumatic regulating valve are arranged sequentially along the material flow direction of the first coolant branch; the second coolant branch is provided with a third pneumatic switch valve.

[0011] According to the membrane concentration system provided by this utility model, the feed liquid return pipeline is further provided with a first temperature sensor, which is located downstream of the heat exchange pipeline along the material flow direction of the feed liquid return pipeline.

[0012] According to the present invention, a membrane concentration system further includes a first inlet branch and a first drain branch. The first inlet branch is connected to the raw liquid tank. The raw liquid outlet pipeline is also equipped with a fourth pneumatic switch valve. Along the material flow direction of the raw liquid outlet pipeline, the fourth pneumatic switch valve is located upstream of the first solid content measuring instrument. The connection point of the first drain branch on the raw liquid outlet pipeline is located upstream of the fourth pneumatic switch valve.

[0013] According to the present invention, a membrane concentration system further includes a second inlet branch and a second drain branch. The connection point of the second inlet branch on the feed liquid outlet pipe is located between the fourth pneumatic switch valve and the first solid content measuring instrument. A fifth pneumatic switch valve is provided on the feed liquid return pipe along the material flow direction of the feed liquid return pipe. The connection point of the second drain branch on the feed liquid return pipe is located upstream of the fifth pneumatic switch valve. A flow measuring instrument is provided on the permeate outlet pipe.

[0014] According to the membrane concentration system provided by this utility model, the permeate discharge pipeline is equipped with a manual switch, a second solids content measuring instrument and a sixth pneumatic switch valve, which are arranged sequentially along the material flow direction of the permeate discharge pipeline.

[0015] The membrane concentration system provided by this invention circulates the fermentation broth between the feed tank and the membrane module through a feed outlet pipeline and a feed return pipeline. During this process, the membrane module separates the fermentation broth; the permeate is continuously discharged from the system, while the target extract is retained and returned to the feed tank via the feed return pipeline. As the circulation continues, the solution concentration in the feed tank continuously increases. A first solids content measuring instrument installed on the feed outlet pipeline monitors the solids content of the liquid flowing to the membrane module in real time. When the detected solids content is lower than a preset target value, the system continues to circulate and concentrate. Once the solids content reaches the target value, the concentrate outlet branch is opened. At this point, the product with the target concentration will no longer return to the feed tank but will be collected as the finished product through the concentrate outlet branch, thus completing the entire concentration process. In this way, by monitoring the material concentration in real time and automatically determining the concentration endpoint, the microbial fermentation broth concentration process is automated, ensuring product stability and consistency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the membrane concentration system provided by this utility model.

[0018] Figure label:

[0019] 1. Raw material tank; 11. Containing space; 12. Agitator; 13. Second temperature sensor; 14. Level gauge; 2. Raw material discharge pipeline; 21. Fourth pneumatic switch valve; 22. Pump body; 23. First solids content measuring instrument; 24. First pressure transmitter; 25. First pneumatic switch valve; 26. Tenth pneumatic switch valve; 27. First drain branch; 28. Eleventh pneumatic switch valve; 29. ​​Second inlet branch; 210. Eighth pneumatic switch valve; 211. Concentrate discharge branch; 3. Membrane module; 4. Raw material return pipeline; 41. Second pressure transmitter; 42. First pneumatic regulating valve; 43. Cooler; 44. First coolant branch; 45. Second pneumatic switch valve; 46. Second pneumatic regulating valve; 47. Third pneumatic switch valve; 48. Second coolant branch; 49. First temperature sensor; 410. Twelfth pneumatic switch valve; 411. Second drain branch; 412. Fifth pneumatic switch valve; 5. Permeate discharge pipe; 51. First manual switch; 52. Second manual switch; 53. Flow meter; 54. Second solids content meter; 55. Sixth pneumatic switch valve; 6. Raw material feed pipe; 61. Seventh pneumatic switch valve; 7. First inlet branch; 71. Ninth pneumatic switch valve; 72. Spray ball. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] like Figure 1 As shown, the membrane concentration system of this utility model embodiment can be applied to the concentration process of extract after microbial fermentation. The membrane concentration system includes: a raw liquid tank 1, a raw liquid feed pipeline 6, a raw liquid discharge pipeline 2, a membrane module 3, a raw liquid reflux pipeline 4, and a permeate discharge pipeline 5.

[0022] The feed line 6 is connected to the feed tank 1, and the feed tank 1 is connected to the membrane module 3 via the feed outlet line 2. The membrane module 3 can be a nanofiltration membrane, typically a spiral wound membrane. The membrane module 3 is connected to the feed tank 1 via the feed return line 4, and the permeate outlet line 5 is connected to the membrane module 3. The permeate discharged via the permeate outlet line 5 is the permeate after the feed has been cross-flow filtered by the membrane module 3, and is generally discharged directly as waste liquid. The feed outlet line 2 is equipped with a first solids content measuring instrument 23, and is connected to a concentrate outlet branch line 211. When the solids content value of the first solids content measuring instrument 23 is equal to the target solids content value, the concentrate outlet branch line 211 is opened. The membrane concentration system may also include a control board, and all measuring instruments, switching instruments, and regulating instruments can be electrically connected to the control board. For example, the first solids content measuring instrument 23 is electrically connected to the control board, and the control board controls the opening or closing of the concentrate outlet branch line 211. The control board can be equipped with a comparison circuit. The raw material tank 1 can also be equipped with a second temperature sensor 13 and a level gauge 14.

[0023] It should be noted that the raw liquid tank 1 is provided with a containment space 11, and a stirrer 12 is provided in the containment space 11. The stirrer 12 keeps the material in the containment space 11 in a state of constant mixing.

[0024] In practical applications, the fermentation broth circulates between the raw liquid tank 1 and the membrane module 3 via the raw liquid discharge pipeline 2 and the raw liquid return pipeline 4. During this process, the membrane module 3 separates the fermentation broth; the permeate is continuously discharged from the system, while the target extract is retained and returned to the raw liquid tank 1 via the raw liquid return pipeline 4. As the circulation continues, the solution concentration in the raw liquid tank 1 continuously increases. The first solids content measuring instrument 23, installed on the raw liquid discharge pipeline 2, monitors the solids content of the liquid flowing to the membrane module 3 in real time. When the detected solids content is lower than the preset target value, the system continues to circulate and concentrate. Once the solids content reaches the target value, the concentrate discharge branch 211 is opened. At this point, the product with the target concentration will no longer return to the raw liquid tank 1 but will be collected as the finished product through the concentrate discharge branch 211, thus completing the entire concentration process. In this way, by monitoring the material concentration in real time and automatically determining the concentration endpoint, the automated operation of the microbial fermentation broth concentration process is achieved, ensuring the stability and consistency of the product.

[0025] As an example, such as Figure 1As shown, the raw liquid discharge pipeline 2 is also equipped with a first pneumatic switch valve 25, which is located downstream of the first solid content measuring instrument 23 along the material flow direction of the raw liquid discharge pipeline 2; the connection point of the concentrate discharge branch 211 on the raw liquid discharge pipeline 2 is located between the first solid content measuring instrument 23 and the first pneumatic switch valve 25. The raw liquid inlet pipeline 6 is equipped with a seventh pneumatic switch valve 61, and the concentrate discharge branch 211 is equipped with an eighth pneumatic switch valve 210.

[0026] It should be noted that after the material flows through the first solids content measuring instrument 23 for detection, since the concentrate outlet branch 211 is closed, it can only continue to flow through the already opened first pneumatic switch valve 25, enter the membrane module 3, and return to the raw liquid tank 1 after concentration. When the first solids content measuring instrument 23 detects that the solids content has reached the target value, the control board issues a command to open the eighth pneumatic switch valve 210 and close the first pneumatic switch valve 25. At this time, the material that has reached the concentration can no longer flow forward after passing through the first solids content measuring instrument 23, and can only be guided out from the newly opened concentrate outlet branch 211 as finished product collection.

[0027] In optional embodiments, such as Figure 1 As shown, the raw liquid discharge pipeline 2 is also equipped with a pump body 22 and a first pressure transmitter 24. Along the material flow direction of the raw liquid discharge pipeline 2, the pump body 22, the first solid content measuring instrument 23 and the first pressure transmitter 24 are arranged in sequence. The raw liquid return pipeline 4 is equipped with a second pressure transmitter 41 and a first pneumatic regulating valve 42. Along the material flow direction of the raw liquid return pipeline 4, the second pressure transmitter 41 and the first pneumatic regulating valve 42 are arranged in sequence.

[0028] Specifically, along the material flow direction of the raw liquid discharge pipeline 2, the pump body 22, the first solid content measuring instrument 23, the first pressure transmitter 24 and the first pneumatic switch valve 25 are arranged in sequence, and the connection point of the concentrate discharge branch 211 on the raw liquid discharge pipeline 2 is located between the first pressure transmitter 24 and the first pneumatic switch valve 25.

[0029] In practical applications, pump body 22 provides power to the entire circulation system, transporting liquid from raw material tank 1 to membrane module 3. Pump body 22 can be a variable frequency pump. The primary function of the first pressure transmitter 24 is to monitor the pressure entering membrane module 3. The second pressure transmitter 41 is used to monitor the pressure of the concentrate exiting membrane module 3. The first pneumatic regulating valve 42 is a valve with precise opening and continuous adjustment.

[0030] For example, the control board receives signals from the first pressure transmitter 24 and the second pressure transmitter 41 in real time. Based on the preset pressure target value, the control board automatically adjusts the opening of the first pneumatic regulating valve 42. If it is necessary to increase the membrane's working pressure, the first pneumatic regulating valve 42 is closed. If it is necessary to decrease the membrane's working pressure, the first pneumatic regulating valve 42 is opened. This ensures operation in constant pressure mode.

[0031] To achieve precise temperature control of the material, a heat exchange pipeline is introduced during the material circulation and concentration process. In optional embodiments, such as... Figure 1 As shown, the raw liquid return pipeline 4 is also equipped with a heat exchange pipeline. Along the material flow direction of the raw liquid return pipeline 4, the heat exchange pipeline is located downstream of the first pneumatic regulating valve 42. The heat exchange pipeline is configured to adjust the temperature of the material flowing through the raw liquid return pipeline 4.

[0032] As an example, the heat exchange pipeline includes a cooler 43, a first coolant branch 44 and a second coolant branch 48. The cooler 43 has a material channel and a coolant channel. The material channel is connected to the raw liquid return pipeline 4. The first coolant branch 44 and the second coolant branch 48 are both connected to the coolant channel.

[0033] Specifically, the higher-temperature concentrate from membrane module 3 flows into the material channel of cooler 43. Inside the channel, it transfers heat to cooler 43, lowering its own temperature, and then returns to the raw material tank 1 via the raw material return line 4. The low-temperature coolant is pumped into the coolant channel of cooler 43 via the first coolant branch line 44. Inside the channel, it absorbs heat from the material, raising its own temperature and becoming a high-temperature coolant. The high-temperature coolant is discharged via the second coolant branch line 48, thus continuously "transferring" heat away from the system.

[0034] In practical applications, the first coolant branch 44 is equipped with a second pneumatic switch valve 45 and a second pneumatic regulating valve 46, which are arranged sequentially along the material flow direction of the first coolant branch 44; the second coolant branch 48 is equipped with a third pneumatic switch valve 47.

[0035] When the system requires cooling, the control board opens the second pneumatic switching valve 45, allowing coolant to flow in. When cooling is not needed, it closes, completely cutting off the coolant supply. The second pneumatic regulating valve 46, located after the second pneumatic switching valve 45, receives signals from the control board and continuously and precisely adjusts the valve opening to control the coolant flow rate. A larger opening results in a larger flow rate and stronger cooling capacity. The third pneumatic switching valve 47 is linked to the second pneumatic switching valve 45, opening and closing simultaneously.

[0036] In optional embodiments, such asFigure 1 As shown, the raw liquid return pipeline 4 is also equipped with a first temperature sensor 49, which is located on the downstream side of the heat exchange pipeline along the material flow direction of the raw liquid return pipeline 4.

[0037] It should be noted that if the actual temperature is higher than the target temperature, it indicates insufficient cooling of the material. The main control board will issue a command to increase the opening of the second pneumatic regulating valve 46 on the first coolant branch 44, allowing more coolant to flow through the heat exchanger, thereby enhancing the cooling effect and lowering the material temperature. If the actual temperature is lower than the target temperature, it indicates over-cooling. The main control board will decrease the opening of the second pneumatic regulating valve 46, reducing the coolant flow and weakening the cooling effect, causing the material temperature to rise. If the actual temperature equals the target temperature, the current opening of the second pneumatic regulating valve 46 will remain unchanged.

[0038] In optional embodiments, such as Figure 1 As shown, the membrane concentration system also includes a first inlet branch 7 and a first drain branch 27. The first inlet branch 7 is connected to the raw liquid tank 1. The raw liquid discharge pipeline 2 is also equipped with a fourth pneumatic switch valve 21. Along the material flow direction of the raw liquid discharge pipeline 2, the fourth pneumatic switch valve 21 is located upstream of the first solid content measuring instrument 23. The connection point of the first drain branch 27 on the raw liquid discharge pipeline 2 is located upstream of the fourth pneumatic switch valve 21.

[0039] Specifically, along the material flow direction of the raw liquid discharge pipeline 2, the fourth pneumatic switch valve 21, pump body 22, first solid content measuring instrument 23, first pressure transmitter 24, and first pneumatic switch valve 25 are sequentially arranged. The first liquid inlet branch 7 is equipped with a ninth pneumatic switch valve 71 and a spray ball 72; the number of spray balls 72 can be one or more, for example, two. The first sewage discharge branch 27 is equipped with a tenth pneumatic switch valve 26.

[0040] It should be noted that the first inlet branch 7 is used to inject liquid into the system, typically cleaning fluid and process water. The cleaning fluid is used for CIP cleaning. The first drain branch 27 is used to discharge waste liquid from the system, such as wastewater after cleaning. It is important to note that the fourth pneumatic switch valve 21 must be closed before cleaning the raw material tank 1.

[0041] In optional embodiments, such as Figure 1As shown, the membrane concentration system also includes a second inlet branch 29 and a second drain branch 411. The connection point of the second inlet branch 29 on the raw liquid discharge pipeline 2 is located between the fourth pneumatic switch valve 21 and the first solid content measuring instrument 23. A fifth pneumatic switch valve 412 is installed on the raw liquid return pipeline 4. Along the material flow direction of the raw liquid return pipeline 4, the connection point of the second drain branch 411 on the raw liquid return pipeline 4 is located upstream of the fifth pneumatic switch valve 412. A flow measuring instrument 53 is installed on the permeate discharge pipeline 5.

[0042] It should be noted that the connection point of the second inlet branch 29 on the raw liquid outlet pipeline 2 is located between the fourth pneumatic switch valve 21 and the pump body 22, and the second inlet branch 29 is equipped with an eleventh pneumatic switch valve 28. Along the material flow direction of the raw liquid return pipeline 4, the second pressure transmitter 41, the first pneumatic regulating valve 42, the cooler 43, the first temperature sensor 49, and the fifth pneumatic switch valve 412 are arranged in sequence. The connection point of the second drain branch 411 on the raw liquid return pipeline 4 is located between the fifth pneumatic switch valve 412 and the first temperature sensor 49, and the second drain branch 411 is equipped with a twelfth pneumatic switch valve 410.

[0043] It should be noted that the fourth pneumatic switch valve 21 and the fifth pneumatic switch valve 412 are closed. The eleventh pneumatic switch valve 28 and the twelfth pneumatic switch valve 410 are opened. The cleaning fluid is injected from the second inlet branch 29 and pumped into the membrane module 3 by the pump body 22. The contaminants are discharged from the second drain branch 411.

[0044] It is particularly important to note that, in addition to CIP after normal concentration, the system can determine the degree of membrane pore blockage by parameters such as permeate flow rate, membrane circulation pressure, and membrane circulation flow rate. When the degree of blockage exceeds the limit, the system can automatically switch to the membrane cleaning program during filtration, and continue the filtration process after cleaning is completed.

[0045] In optional embodiments, such as Figure 1 As shown, the permeate discharge pipeline 5 is equipped with a manual switch, a second solid content measuring instrument 54, and a sixth pneumatic switch valve 55. Along the material flow direction of the permeate discharge pipeline 5, the manual switch, the second solid content measuring instrument 54, and the sixth pneumatic switch valve 55 are arranged in sequence.

[0046] The manual switches include a first manual switch 51 and a second manual switch 52, which are connected in parallel with the membrane module 3. The first and second manual switches 51 and 52 are positioned differently along the height of the membrane module 3; for example, the first manual switch 51 is near the bottom of the membrane module 3, and the second manual switch 52 is near the top of the membrane module 3. Additionally, along the material flow direction of the permeate discharge pipeline 5, the manual switches, flow meter 53, second solids content meter 54, and sixth pneumatic switch valve 55 are sequentially arranged. The second solids content meter 54 is used to monitor the status of the membrane module 3; a sudden increase in the solids content value of the second solids content meter 54 indicates that the membrane module 3 is damaged or leaking.

[0047] The following combination Figure 1 The entire membrane concentration system is described in detail.

[0048] I. System Startup and Concentration Process

[0049] After the raw material tank 1 is fed through the raw material feed pipeline 6, the system automatically opens the fourth pneumatic switch valve 21, the first pneumatic switch valve 25, and the fifth pneumatic switch valve 412, and starts the pump body 22, establishing a circulation path of "raw material tank 1 → pump body 22 → nanofiltration membrane → raw material tank 1". Subsequently, the frequency of the pump body 22 is gradually increased to 45Hz, and the system pressure (based on the reading of the second pressure transmitter 41) is stably controlled at 30±5 bar by adjusting the opening of the first pneumatic regulating valve 42, thus officially starting the concentration process. At the same time, the second pneumatic switch valve 45 and the third pneumatic switch valve 47 of the cooling system are opened, and the second pneumatic regulating valve 46 is adjusted to ensure that the temperature of the reflux material is always below 35℃.

[0050] II. Determination of Concentration Endpoint and Discharge

[0051] During the concentration process, the value displayed by the first solids content measuring instrument 23 continuously increases. When the solids content reaches 20% or more, concentration is considered complete; alternatively, the ratio of the remaining volume in the raw liquid tank 1 to the discharged volume of the permeate can be used to assist in the judgment. After concentration is complete, the eighth pneumatic switch valve 210 is opened to discharge the qualified concentrated liquid to the next stage. After the concentrated liquid is drained, a small amount of purified water is added through the first inlet branch 7 to perform a "top wash" on the system pipeline, merging the remaining concentrated liquid into the next stage, thereby improving the product yield.

[0052] III. Cleaning after production

[0053] After the entire batch of liquid is drained, the system executes a zone cleaning procedure:

[0054] Cleaning the raw material tank 1 area: Close the fourth pneumatic switch valve 21 and the fifth pneumatic switch valve 412, and open the ninth pneumatic switch valve 71 and the tenth pneumatic switch valve 26 to clean the raw material tank 1 and its related upstream pipelines.

[0055] Cleaning membrane module 3 area: Simultaneously open the eleventh pneumatic switch valve 28 and the twelfth pneumatic switch valve 410 to independently clean membrane module 3 and concentrate circulation loop.

[0056] IV. Online Detection and Cleaning / Regeneration of Membrane Fouling

[0057] During the filtration process, if the flow meter 53 on the permeate outlet pipeline 5 detects a flow rate of zero or significantly lower than the historical normal value, it is determined that the membrane module 3 is fouled and requires online cleaning. At this time, the fourth pneumatic switch valve 21 is closed and the eleventh pneumatic switch valve 28 is opened, using purified water to push the feed liquid in the membrane module 3 back to the feed tank 1 to recover the product. Subsequently, the fifth pneumatic switch valve 412 is closed and the twelfth pneumatic switch valve 410 is opened to clean the membrane module 3. After the flow meter 53 shows that the flow rate has returned to the normal level, the eleventh pneumatic switch valve 28 and the twelfth pneumatic switch valve 410 are closed, and the fourth pneumatic switch valve 21 and the fifth pneumatic switch valve 412 are reopened to continue the concentration process until the program is completed.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A membrane concentration system, characterized in that, include: Feed tank, feed line, feed outlet line, membrane module, feed return line and permeate outlet line; The feed line is connected to the feed tank, the feed tank is connected to the membrane module via the feed outlet line, the membrane module is connected to the feed tank via the feed return line, and the permeate outlet line is connected to the membrane module. The feed outlet line is equipped with a first solids content measuring instrument, and the feed outlet line is connected to a concentrate outlet branch. When the solids content value of the first solids content measuring instrument equals the target solids content value, the concentrate outlet branch is activated.

2. The membrane concentration system according to claim 1, characterized in that, The raw liquid discharge pipeline is also equipped with a first pneumatic switch valve, which is located downstream of the first solid content measuring instrument along the material flow direction of the raw liquid discharge pipeline; the connection point of the concentrated liquid discharge branch on the raw liquid discharge pipeline is located between the first solid content measuring instrument and the first pneumatic switch valve.

3. The membrane concentration system according to claim 1, characterized in that, The raw liquid discharge pipeline is also equipped with a pump body and a first pressure transmitter. Along the material flow direction of the raw liquid discharge pipeline, the pump body, the first solid content measuring instrument, and the first pressure transmitter are arranged in sequence. The raw liquid return pipeline is equipped with a second pressure transmitter and a first pneumatic regulating valve. Along the material flow direction of the raw liquid return pipeline, the second pressure transmitter and the first pneumatic regulating valve are arranged in sequence.

4. The membrane concentration system according to claim 3, characterized in that, The raw liquid return pipeline is also provided with a heat exchange pipeline. Along the material flow direction of the raw liquid return pipeline, the heat exchange pipeline is located downstream of the first pneumatic regulating valve. The heat exchange pipeline is configured to adjust the temperature of the material flowing through the raw liquid return pipeline.

5. The membrane concentration system according to claim 4, characterized in that, The heat exchange pipeline includes a cooler, a first coolant branch, and a second coolant branch. The cooler has a material channel and a coolant channel. The material channel is connected to the raw liquid return pipeline. The first coolant branch and the second coolant branch are both connected to the coolant channel.

6. The membrane concentration system according to claim 5, characterized in that, The first coolant branch is equipped with a second pneumatic switch valve and a second pneumatic regulating valve, which are arranged sequentially along the material flow direction of the first coolant branch; the second coolant branch is equipped with a third pneumatic switch valve.

7. The membrane concentration system according to claim 4, characterized in that, The raw liquid return pipeline is also equipped with a first temperature sensor, which is located downstream of the heat exchange pipeline along the material flow direction of the raw liquid return pipeline.

8. The membrane concentration system according to claim 1, characterized in that, The membrane concentration system further includes a first inlet branch and a first drain branch. The first inlet branch is connected to the raw liquid tank. The raw liquid outlet pipeline is also equipped with a fourth pneumatic switch valve. Along the material flow direction of the raw liquid outlet pipeline, the fourth pneumatic switch valve is located upstream of the first solid content measuring instrument. The connection point of the first drain branch on the raw liquid outlet pipeline is located upstream of the fourth pneumatic switch valve.

9. The membrane concentration system according to claim 8, characterized in that, The membrane concentration system further includes a second inlet branch and a second drain branch. The connection point of the second inlet branch on the feed liquid outlet pipeline is located between the fourth pneumatic switch valve and the first solid content measuring instrument. A fifth pneumatic switch valve is installed on the feed liquid return pipeline. Along the material flow direction of the feed liquid return pipeline, the connection point of the second drain branch on the feed liquid return pipeline is located upstream of the fifth pneumatic switch valve. A flow measuring instrument is installed on the permeate outlet pipeline.

10. The membrane concentration system according to claim 1, characterized in that, The permeate discharge pipeline is equipped with a manual switch, a second solids content measuring instrument, and a sixth pneumatic switch valve, which are arranged sequentially along the material flow direction of the permeate discharge pipeline.

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