A beer fermentation liquid filtration device

Abstract

This utility model discloses a beer fermentation liquid filtration device, relating to the field of beer filtration. A buffer tank is equipped with a return port and a drain port. The membrane filtration device is equipped with an input end, an output end, and a clear liquid output port. The drain port is connected to the input end via a fermentation liquid pipeline, the output end is connected to the return port via a reflux pipeline, and the clear liquid output port is connected to the clear liquid tank via a clear liquid pipeline. The membrane filtration device contains multiple replaceable filter tanks, each equipped with a hollow fiber membrane. These filter tanks are connected in parallel or series. A filtrate detection device is installed in the circulation loop containing the buffer tank, fermentation liquid pipeline, membrane filtration device, reflux pipeline, and clear liquid pipeline. This device measures the state of the liquid before and after filtration, thereby determining the filtration effect of the hollow fiber membrane pore size and the filtration process on the beer fermentation liquid. This allows for precise control of the beer filtration process, achieving the goal of clarifying and removing impurities from the beer while maintaining its original flavor.

Description

Technical Field

[0001] This utility model relates to the field of beer filtration, and in particular to a beer fermentation liquid filtration device. Background Technology

[0002] In the beer production process, filtration of the beer fermentation liquid is one of the core steps. As awareness of the drawbacks of diatomaceous earth has deepened, soilless filtration has become a development trend in beer filtration. Hollow fiber membranes, as fibrous asymmetric separation membranes with a hollow structure, achieve molecular-level separation through micropores or functional skin layers on the membrane wall. Furthermore, no filter aids are needed during filtration, effectively eliminating secondary sources of external contamination. Therefore, applying hollow fiber membranes to the filtration of beer fermentation liquid has gradually become the preferred choice for manufacturers. The pore size and filtration process of hollow fiber membranes are crucial factors affecting the filtration quality of beer fermentation liquid. Therefore, it is necessary to explore the impact of hollow fiber membrane pore size and filtration process on the filtration effect of beer fermentation liquid. By analyzing the quality of the filtered beer fermentation liquid, a suitable hollow fiber membrane pore size and appropriate filtration process can be selected, providing a theoretical basis for subsequent practical production. Utility Model Content

[0003] The purpose of this invention is to provide a beer fermentation liquid filtration device to solve the problems existing in the prior art. When conducting tests on the filtration performance of hollow fiber membranes on beer fermentation liquid, the beer filtration process is precisely controlled to achieve the purpose of clarifying beer and removing impurities, while maintaining the original flavor of the filtered beer.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a beer fermentation liquid filtration device, including a buffer tank, a membrane filtration device, a clear liquid tank, and a filtrate detection device;

[0005] The buffer tank is equipped with a return port and a drain port, and the membrane filtration device is equipped with an input end, an output end and a clear liquid output port;

[0006] The outlet and the inlet are connected by a fermentation broth pipeline, the outlet and the return outlet are connected by a reflux pipeline, and the clear liquid outlet and the clear liquid tank are connected by a clear liquid pipeline.

[0007] The membrane filtration device contains multiple replaceable filter canisters, each equipped with a hollow fiber membrane. The filter canisters are connected in parallel or in series.

[0008] The filtrate detection device is installed on the circulation loop containing the buffer tank, fermentation broth pipeline, membrane filtration device, reflux pipeline, and clear filtrate pipeline.

[0009] In one embodiment, a first pressure valve, a constant pressure pump, and a second pressure valve are sequentially arranged on the fermentation broth pipeline along the flow direction of the fermentation broth; a temperature sensor is arranged on the reflux pipeline, and a second flow meter and a fifth pressure valve are arranged on the clear liquid pipeline.

[0010] In one embodiment, the filtrate detection device includes a first flow meter, a conductivity meter, and a third pressure sensor;

[0011] The first flow meter is installed on the fermentation broth pipeline and is located downstream of the constant pressure pump. It is used to detect the flow rate of the liquid before it enters the filter tank.

[0012] The conductivity meter is installed on the return pipe to detect the conductivity of the liquid passing through the return pipe;

[0013] The third pressure sensor is installed on the clear liquid pipeline to detect the pressure of the liquid in the clear liquid pipeline.

[0014] In one embodiment, the filter tank is provided with an inlet and an outlet at both ends, and a cleaning outlet is provided on the side of the filter tank near the outlet.

[0015] In one embodiment, when multiple filter tanks are connected in parallel, the hollow fiber membranes in the multiple filter tanks have different pore sizes, and the liquid inlets of the multiple filter tanks are connected and connected to the fermentation broth pipeline through the input end, the liquid outlets of the multiple filter tanks are connected and connected to the reflux pipeline through the output end, and the clear liquid outlets of the multiple filter tanks are connected and connected to the clear liquid pipeline through the clear liquid output outlet.

[0016] Pressure sensors are installed at the inlets of multiple filter tanks, and a third pressure valve is installed between adjacent pressure sensors.

[0017] In one embodiment, the membrane filtration device includes a first filter canister and a second filter canister, wherein the pore size of the hollow fiber membrane in the first filter canister is 0.65 μm and the pore size of the hollow fiber membrane in the second filter canister is 0.45 μm.

[0018] In one embodiment, a first pressure sensor is provided at the inlet of the first filter tank, and a fourth pressure valve is provided at the outlet of the first filter tank; a second pressure sensor is provided at the inlet of the second filter tank.

[0019] In one embodiment, when multiple filter tanks are connected in series, the hollow fiber membranes in the multiple filter tanks have the same pore size, and the inlet of the first-stage filter tank is connected to the fermentation broth pipeline through the input end, the outlet of the last-stage filter tank is connected to the reflux pipeline through the output end, and the outlet and inlet of adjacent filter tanks between the first-stage filter tank and the last-stage filter tank are connected.

[0020] In one embodiment, when multiple filter tanks are connected in series, the pore sizes of the hollow fiber membranes in the multiple filter tanks are different, and the inlet of the first-stage filter tank is connected to the fermentation broth pipeline through the input end, the outlet of the last-stage filter tank is connected to the reflux pipeline through the output end, the clear liquid port and the inlet of adjacent filter tanks between the first-stage filter tank and the last-stage filter tank are connected, and the clear liquid port of the last-stage filter tank is connected to the clear liquid tank through the clear liquid pipeline.

[0021] In one embodiment, the membrane filtration device includes a first filter tank and a second filter tank; a first pressure sensor is provided on the inlet of the first filter tank, and a second pressure sensor is provided on the pipe connecting the outlet of the first filter tank and the inlet of the second filter tank.

[0022] The present invention achieves the following technical advantages over the prior art:

[0023] The buffer tank is equipped with a return port and a drain port, while the membrane filtration device is equipped with an input end, an output end, and a clear liquid output port. The drain port is connected to the input end via a fermentation broth pipeline, the output end is connected to the return port via a reflux pipeline, and the clear liquid output port is connected to the clear liquid tank via a clear liquid pipeline. The membrane filtration device contains multiple replaceable filter tanks, the number of which is determined according to actual needs. Hollow fiber membranes are installed on the filter tanks, and the filter tanks are connected in series or parallel. A filtrate detection device is installed in the circulation loop containing the buffer tank, fermentation broth pipeline, membrane filtration device, reflux pipeline, and clear liquid pipeline. By measuring the filtered liquid through the filtrate detection device, the influence of the hollow fiber membrane pore size and filtration process on the filtration performance of the hollow fiber membrane can be determined, thereby improving the efficiency of the filtration process and providing a theoretical basis for subsequent actual production. Furthermore, in the actual production process, the filtration pore size and filtration process of the filter membrane can be adjusted according to the "filtration effect of hollow fiber membrane pore size and filtration process on beer fermentation broth" to improve the filtration effect on beer fermentation broth. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a beer fermentation liquid filtration device in one embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the connection relationship in the parallel mode of the filter tanks in one embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram showing the connection between the outlet of the first filter tank and the inlet of the second filter tank in a series configuration of filter tanks in one embodiment of this utility model.

[0028] Figure 4 This is a schematic diagram showing the connection between the clear liquid port of the first filter tank and the liquid inlet of the second filter tank in a series configuration of filter tanks in one embodiment of the present invention.

[0029] The components are as follows: 1. Buffer tank; 2. Membrane filtration device; 3. Clarified liquid tank; 4. Return liquid port; 5. Drain port; 6. Fermentation broth pipeline; 7. Reflux pipeline; 8. Clarified liquid pipeline; 9. First filter tank; 10. Second filter tank; 11. First pressure valve; 12. Constant pressure pump; 13. Second pressure valve; 14. Temperature sensor; 15. Second flow meter; 16. Fifth pressure valve; 17. First flow meter; 18. Conductivity meter; 19. Third pressure sensor; 20. First pressure sensor; 21. Second pressure sensor; 22. Third pressure valve; 23. Fourth pressure valve; 24. Input end; 25. Output end; 26. Clarified liquid output port. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] The purpose of this invention is to provide a beer fermentation liquid filtration device to solve the problems existing in the prior art, improve the filtration effect, and provide a theoretical basis for subsequent actual production. In this embodiment, the filtration process of beer fermentation liquid is used as an example to illustrate the above device.

[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] Please refer to Figures 1 to 4 This embodiment provides a beer fermentation liquid filtration device, including a buffer tank 1, a membrane filtration device 2, a clear liquid tank 3, and a filtrate detection device. The buffer tank 1 contains beer fermentation liquid. The buffer tank 1 is provided with a return port 4 and a drain port 5. The membrane filtration device 2 is provided with an input end 24, an output end 25, and a clear liquid output port 26.

[0035] The outlet 5 is connected to the inlet 24 via the fermentation liquid pipe 6, the outlet 25 is connected to the return outlet 4 via the return pipe 7, and the clear liquid outlet 26 is connected to the clear liquid tank 3 via the clear liquid pipe 8, thus forming a loop between the buffer tank 1 and the membrane filter device 2. The beer fermentation liquid in the buffer tank 1 enters the membrane filter device 2 through the fermentation liquid pipe 6, and the membrane filter device 2 filters the beer fermentation liquid in the buffer tank 1. The filtered beer fermentation liquid is discharged from the outlet 25 of the membrane filter device 2 and re-enters the buffer tank 1 through the return pipe 7. After mixing the filtered beer fermentation liquid with the unfiltered beer fermentation liquid in the buffer tank 1, the concentration of impurities in the unfiltered beer fermentation liquid is reduced, the workload of the membrane filter device 2 is reduced, and the filtration effect is guaranteed.

[0036] The membrane filtration device 2 is equipped with multiple replaceable filter canisters, each containing a hollow fiber membrane. The connection method between the filter canisters can be changed according to different purposes, i.e., the connection relationship between the filter canisters can be parallel or series.

[0037] When the filter tanks are connected in parallel, filter tanks with different pore sizes of hollow fiber membranes are selected for parallel connection to ensure that the pressure of beer fermentation liquid leading to each filter tank is equal, and the filtration performance of each filter tank on beer fermentation liquid can be observed individually.

[0038] When connecting the filter tanks in series, filter tanks with the same hollow fiber membrane pore size can be used, or filter tanks with different hollow fiber membrane pore sizes can be used. When filter tanks with the same hollow fiber membrane pore size are used in series, the pressure entering each filter tank gradually decreases as the beer fermentation liquid flows through the series of filter tanks, allowing observation of the filtration effect of the hollow fiber membrane on the beer fermentation liquid under different pressures. When filter tanks with different hollow fiber membrane pore sizes are used in series, the filter tank with the larger hollow fiber membrane pore size is placed upstream of the filter tank with the smaller hollow fiber membrane pore size. The beer fermentation liquid first passes through the filter tank with the larger hollow fiber membrane pore size, and then the filtered beer fermentation liquid passes through the filter tank with the smaller hollow fiber membrane pore size. The beer fermentation liquid is filtered step by step through filter tanks with different pore sizes, ensuring that impurities in the beer fermentation liquid are completely removed and improving the filtration efficiency of the beer fermentation liquid.

[0039] A filtrate detection device is also installed on the circulation loop containing buffer tank 1, fermentation liquid pipeline 6, membrane filtration device 2, reflux pipeline 7 and clear liquid pipeline 8. The filtration effect of hollow fiber membrane on beer fermentation liquid is obtained by detecting the state of beer fermentation liquid before and after filtration.

[0040] A first pressure valve 11, a constant pressure pump 12, and a second pressure valve 13 are sequentially installed along the flow direction of the fermentation liquid on the fermentation liquid pipeline 6. The first pressure valve 11 and the second pressure valve 13 are used to balance the pressure of the beer fermentation liquid in the fermentation liquid pipeline 6, so as to avoid sudden changes in the pressure of the beer fermentation liquid in the circulating pipeline during the filtration process, which could damage the membrane filter device 2. The constant pressure pump 12 provides the membrane filter device 2 with beer fermentation liquid at a constant pressure, so as to promote the membrane filter device 2 to accelerate the filtration efficiency of the beer fermentation liquid. A temperature sensor 14 is installed on the return pipeline 7 to detect the temperature of the beer fermentation liquid in the return pipeline, so as to ensure the stability of the beer fermentation liquid temperature and maintain the stability of the hollow fiber membrane screening effect. A second flow meter 15 and a fifth pressure valve 16 are installed on the clear liquid pipeline 8. The liquid that meets the standards after filtration by the membrane filter device 2 is introduced into the clear liquid tank 3 through the clear liquid pipeline 8. The second flow meter 15 records the flow rate of the filtered liquid, and the fifth pressure valve 16 balances the pressure value of the beer fermentation liquid in the clear liquid pipeline 8.

[0041] The first pressure valve 11, the second pressure valve 13, the constant pressure pump 12 installed on the fermentation liquid pipeline 6, the temperature sensor 14 installed on the return pipeline 7, and the second flow meter 15 and the fifth pressure valve 16 installed on the clear liquid pipeline 8 are all components installed in the existing beer filtration process. The remaining functions of the above components are the same as those in the prior art, and will not be described in detail here.

[0042] The filtrate detection device includes a first flow meter 17, a conductivity meter 18, and a third pressure sensor 19. The first flow meter 17 is installed on the fermentation broth pipeline 6 and is located downstream of the constant pressure pump 12. It is used to detect the flow rate of the liquid before it enters the filter tank. In this embodiment, it is used to measure the flow rate of the beer fermentation broth entering the membrane filtration device 2 and compare it with the flow rate data measured by the second flow meter 15 installed on the clear liquid pipeline 8, so as to calculate the filtration efficiency of the membrane filtration device 2.

[0043] The conductivity meter 18 is installed on the return pipe 7. The conductivity of the beer fermentation liquid filtered by the membrane filter device 2 is detected by the conductivity meter 18. As the beer fermentation liquid circulates into the membrane filter device 2 for filtration, the impurity content in the beer fermentation liquid gradually decreases, and the conductivity also gradually decreases until it meets the industry standard for beer fermentation liquid bottling. At this time, the filtered beer fermentation liquid can be introduced into the clear liquid tank 3 through the clear liquid pipe 8.

[0044] The third pressure sensor 19 is installed on the clear liquid pipeline 8 to detect the pressure of the liquid in the clear liquid pipeline 8. By comparing it with the pressure of the beer fermentation liquid flowing into the membrane filter device 2, the pump speed of the constant pressure pump 12 or the valve opening of the pressure valve is adjusted in a linkage manner to avoid the membrane filter device 2 from malfunctioning due to excessive pressure difference.

[0045] In this embodiment, the filter tank is provided with an inlet and an outlet at both ends. The inlet is used to introduce the beer fermentation liquid to be filtered into the filter tank, and the outlet is used to discharge the beer fermentation liquid after it has been filtered by the filter tank. A clear liquid outlet is provided on the side of the filter tank near the outlet. After the conductivity of the beer fermentation liquid reaches the industry standard, it is discharged from the filter tank through the clear liquid outlet and then introduced into the clear liquid tank 3 through the clear liquid pipe 8.

[0046] The connection method of the multiple filter tanks in the membrane filtration device 2 can be changed according to different filtration methods, that is, the connection method of the multiple filter tanks can be adjusted to be connected in series or in parallel;

[0047] When multiple filter tanks are connected in parallel, the filtration effect of hollow fiber membranes with different pore sizes on beer fermentation liquid can be investigated. Since the pressure at the inlet of each filter tank is equal, the filtration performance of each filter tank can be observed individually.

[0048] Specifically, the inlets of multiple filter tanks are connected and connected to the fermentation broth pipeline 6 via input terminal 24. The beer fermentation broth to be tested in buffer tank 1 is introduced into the filter tanks through the fermentation broth pipeline 6. Since the inlets of each filter tank are directly connected to the fermentation broth pipeline 6, a pressure sensor is installed at the inlet of each filter tank, and a third pressure valve 22 is installed between adjacent pressure sensors. The third pressure valve 22 balances the pressure of the beer fermentation broth at the inlet of each filter tank, and the pressure sensor detects the liquid pressure at the inlet of the filter tank to ensure that the pressure of the beer fermentation broth at the inlet of each filter tank is maintained. With equal pressure, the outlets of multiple filter tanks are connected and connected to the return pipe 7 through the output end 25, so that the filtered beer fermentation liquid is returned to the buffer tank 1. During the return process, the conductivity of the beer fermentation liquid is detected. The clear liquid outlets of multiple filter tanks are connected. After the conductivity of the beer fermentation liquid reaches the corresponding industry standard, the qualified beer fermentation liquid is introduced into the clear liquid tank 3 through the clear liquid output port 26 and the clear liquid pipe 8. During the test, the main tests are on the changes in beer fermentation liquid pressure, beer production flow rate and transmembrane pressure difference at the inlet of different filter tanks over time, so as to judge the filtration effect of the filter tank on the beer fermentation liquid.

[0049] In this embodiment, the membrane filtration device 2 includes a first filter tank 9 and a second filter tank 10. The hollow fiber membrane in the first filter tank 9 has a pore size of 0.65 μm, and the hollow fiber membrane in the second filter tank 10 has a pore size of 0.45 μm. A first pressure sensor 20 is provided on the liquid inlet of the first filter tank 9, and a fourth pressure valve 23 is provided on the liquid outlet of the first filter tank 9. A second pressure sensor 21 is provided on the liquid inlet of the second filter tank 10.

[0050] When multiple filter tanks are connected in series, assuming the pore size of the hollow fiber membranes in each filter tank is equal, the effect of different pressures on the filtration performance of the hollow fiber membranes can be investigated. The inlet of the first-stage filter tank is connected to the fermentation broth pipeline 6 via input end 24, and the outlet of the last-stage filter tank is connected to the return pipeline 7 via output end 25. The outlets and inlets of adjacent filter tanks between the first-stage and last-stage filter tanks are connected, forming a series structure between the first-stage and last-stage filter tanks, as well as between the first-stage and last-stage filter tanks. After the beer fermentation broth in the fermentation broth pipeline 6 is filtered by the first-stage filter tank, the pressure of the beer fermentation broth decreases. The beer fermentation liquid filtered by the first-stage filter tank is fed into the second-stage filter tank as raw material, and so on. The beer fermentation liquid fed into the next stage filter tank is always the beer fermentation liquid filtered by the previous stage filter tank. Correspondingly, the pressure of the beer fermentation liquid fed into the next stage filter tank will gradually decrease. In addition, a pressure sensor is installed at the inlet of each stage filter tank to measure the pressure of the beer fermentation liquid fed into each stage filter tank. During the test, the changes in the inlet pressure, beer production flow rate and transmembrane pressure difference of two adjacent filter tanks over time are detected, thereby judging the filtration performance of the filter tank for beer fermentation liquid.

[0051] In this embodiment, the membrane filtration device 2 includes a first filter tank 9 and a second filter tank 10, wherein the pore size of the hollow fiber membrane in the first filter tank 9 and the second filter tank 10 is 0.45μm or 0.65μm.

[0052] When multiple filter tanks are connected in series, the effect of hollow fiber membranes with different pore sizes on the filtration effect of beer fermentation liquid can be investigated under the series mode. The inlet of the first-stage filter tank is connected to the fermentation liquid pipeline 6 through the input end 24, and the outlet of the last-stage filter tank is connected to the return pipeline 7 through the output end 25. The clear liquid inlet and inlet of adjacent filter tanks between the first-stage and last-stage filter tanks are connected, so that the filter tanks between the first-stage and last-stage filter tanks and between the first-stage and last-stage filter tanks form a series structure. Along the flow direction of the fermentation liquid, the pore size of the hollow fiber membrane in the filter tank of the membrane filtration device 2 gradually decreases. The fermentation liquid is filtered step by step through each filter tank to ensure that impurities in the fermentation liquid are completely removed and to improve the filtration effect of the membrane filtration device on the beer fermentation liquid.

[0053] Preferably, the membrane filtration device 2 includes a first filter canister 9 and a second filter canister 10. The hollow fiber membrane in the first filter canister 9 has a pore size of 0.65 μm, and the hollow fiber membrane in the second filter canister 10 has a pore size of 0.45 μm.

[0054] In series mode, a first pressure sensor 20 is installed on the inlet of the first filter tank 9, and a second pressure sensor 21 is installed on the pipe connecting the clear liquid outlet of the first filter tank 9 and the inlet of the second filter tank 10.

[0055] Example 2

[0056] This embodiment provides a solution for cleaning a beer filtration device, as detailed below:

[0057] After the beer fermentation liquid is filtered, the buffer tank 1 is replaced with a cleaning tank, while the other pipe connections remain unchanged. Cleaning liquid is introduced into the cleaning tank, and the system is run. The cleaning liquid flows through the fermentation liquid pipe 6 through the membrane filter device 2, and then flows back to the cleaning tank through the return pipe 7, immersing the hollow fiber membrane in the membrane filter device 2 in the cleaning liquid. During this process, the cleaning liquid reacts chemically with the contaminants on the membrane surface, softening or dissolving the contaminants and causing them to detach from the membrane surface. After soaking, the cleaning liquid in the membrane filter device 2 is discharged, and clean water is introduced into the cleaning tank. The constant pressure pump 12 is then reversed, and the clean water in the clean liquid tank flows back to the cleaning tank through the return pipe 7, the membrane filter device 2, and the fermentation liquid pipe 6. The water flows through the membrane pores in the opposite direction to the flow of the beer fermentation liquid during filtration, peeling the loosened contaminants off the membrane surface and discharging them from the hollow fiber membrane, thus completing the cleaning of the hollow fiber membrane in the membrane filter device 2.

[0058] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0059] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0060] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A beer fermentation liquid filtration device, characterized in that, It includes a buffer tank (1), a membrane filtration device (2), a clear liquid tank (3), and a filtrate detection device; The buffer tank (1) is provided with a return port (4) and a drain port (5), and the membrane filter device (2) is provided with an input end (24), an output end (25) and a clear liquid output port (26); The drain port (5) is connected to the input end (24) through the fermentation liquid pipe (6), the output end (25) is connected to the return port (4) through the return pipe (7), and the clear liquid output port (26) is connected to the clear liquid tank (3) through the clear liquid pipe (8). The membrane filtration device (2) is equipped with multiple replaceable filter canisters, each of which is fitted with a hollow fiber membrane. The filter canisters are connected in parallel or in series. The filtrate detection device is installed on the circulation loop containing the buffer tank (1), the fermentation broth pipeline (6), the membrane filtration device (2), the reflux pipeline (7), and the clear filtrate pipeline (8).

2. The beer fermentation liquid filtration device according to claim 1, characterized in that, The fermentation broth pipeline (6) is provided with a first pressure valve (11), a constant pressure pump (12), and a second pressure valve (13) in sequence along the flow direction of the fermentation broth; the reflux pipeline (7) is provided with a temperature sensor (14), and the clear liquid pipeline (8) is provided with a second flow meter (15) and a fifth pressure valve (16).

3. The beer fermentation liquid filtration device according to claim 2, characterized in that, The filtrate detection device includes a first flow meter (17), a conductivity meter (18), and a third pressure sensor (19); The first flow meter (17) is installed on the fermentation broth pipeline (6) and is located downstream of the constant pressure pump (12) to detect the flow rate of the liquid entering the filter tank; The conductivity meter (18) is installed on the return pipe (7) to detect the conductivity of the liquid passing through the return pipe (7); The third pressure sensor (19) is installed on the clear liquid pipe (8) and is used to detect the pressure of the liquid in the clear liquid pipe (8).

4. The beer fermentation liquid filtration device according to claim 3, characterized in that, The filter can is provided with an inlet and an outlet at both ends, and a clearing port is provided on the side of the filter can near the outlet.

5. The beer fermentation liquid filtration device according to claim 4, characterized in that, When multiple filter tanks are connected in parallel, the pore sizes of the hollow fiber membranes in the multiple filter tanks are different, and the liquid inlets of the multiple filter tanks are connected and connected to the fermentation broth pipeline (6) through the input end (24), the liquid outlets of the multiple filter tanks are connected and connected to the reflux pipeline (7) through the output end (25), and the clear liquid outlets of the multiple filter tanks are connected and connected to the clear liquid pipeline (8) through the clear liquid output outlet (26). Pressure sensors are provided on the inlets of the multiple filter tanks, and a third pressure valve (22) is provided between adjacent pressure sensors.

6. The beer fermentation liquid filtration device according to claim 5, characterized in that, The membrane filtration device (2) includes a first filter canister (9) and a second filter canister (10). The pore size of the hollow fiber membrane in the first filter canister (9) is 0.65 μm, and the pore size of the hollow fiber membrane in the second filter canister (10) is 0.45 μm.

7. The beer fermentation liquid filtration device according to claim 6, characterized in that, A first pressure sensor (20) is provided on the inlet of the first filter tank (9), and a fourth pressure valve (23) is provided on the outlet of the first filter tank (9); a second pressure sensor (21) is provided on the inlet of the second filter tank (10).

8. The beer fermentation liquid filtration device according to claim 4, characterized in that, When multiple filter tanks are connected in series, the hollow fiber membranes in the multiple filter tanks have the same pore size, and the inlet of the first-stage filter tank is connected to the fermentation broth pipeline (6) through the input end (24), the outlet of the last-stage filter tank is connected to the reflux pipeline (7) through the output end (25), and the outlet and inlet of adjacent filter tanks between the first-stage and last-stage filter tanks are connected.

9. The beer fermentation liquid filtration device according to claim 4, characterized in that, When multiple filter tanks are connected in series, the pore sizes of the hollow fiber membranes in the multiple filter tanks are different, and the inlet of the first-stage filter tank is connected to the fermentation broth pipeline (6) through the input end (24), the outlet of the last-stage filter tank is connected to the reflux pipeline (7) through the output end (25), the clear liquid outlet and the inlet of the adjacent filter tanks between the first-stage and last-stage filter tanks are connected, and the clear liquid outlet of the last-stage filter tank is connected to the clear liquid tank (3) through the clear liquid pipeline (8).

10. The beer fermentation liquid filtration device according to claim 8 or 9, characterized in that, The membrane filtration device (2) includes a first filter tank (9) and a second filter tank (10); a first pressure sensor (20) is provided on the inlet of the first filter tank (9), and a second pressure sensor (21) is provided on the pipe connecting the outlet of the first filter tank (9) and the inlet of the second filter tank (10).

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