Mycoprotein concentration system

Abstract

The utility model provides a mycoprotein concentration system, and belongs to the field of mycoprotein preparation. The system comprises a raw material liquid tank; an inlet of the first-stage centrifugal machine is communicated with an outlet of the raw material liquid tank; an inlet of the first-stage concentrated liquid tank is communicated with a concentrated liquid outlet of the first-stage centrifugal machine; an inlet of the second-stage centrifugal machine is communicated with an outlet of the first-stage concentrated liquid tank, and a clear liquid outlet of the second-stage centrifugal machine is communicated with the raw material liquid tank; the second-stage concentrated liquid tank is communicated with a concentrated liquid outlet of the second-stage centrifugal machine; and an inlet of the drying tower is communicated with an outlet of the secondary concentrated liquid tank. Through continuous work of the first-stage centrifugal machine and the second-stage centrifugal machine, efficient concentration of mycoprotein residual distilled water is achieved, and the protein recovery rate is increased. Meanwhile, the clear liquid of the second-stage centrifugal machine contains higher mycoprotein, and the mycoprotein is discharged into the raw material liquid tank again to be centrifuged and utilized again, so that the recovery efficiency of the protein is further improved.

Description

Technical Field

[0001] This application relates to the field of bacterial protein preparation technology, and in particular to a bacterial protein concentration system. Background Technology

[0002] Directly discharging wastewater containing bacterial cells into the sewage system wastes resources and increases the burden on environmental treatment. This problem can be solved by concentrating and separating the wastewater containing bacterial proteins and then spray drying it. Spray drying is a method for drying materials. In a drying chamber, the concentrated material is atomized, and upon contact with hot air, the moisture rapidly vaporizes, resulting in a dried product. This method can directly dry solutions and emulsions into powdered or granular products, eliminating the need for evaporation and pulverization processes. The concentration of the concentrated material directly affects the energy consumption level of spray drying. Methods for concentrating bacterial materials include centrifugation, filtration, ultrafiltration, and evaporation concentration, which can be selected based on the properties of different materials. However, a current technical problem is the low recovery rate of bacterial proteins. Utility Model Content

[0003] This application provides a bacterial protein concentration system to solve the following technical problem: how to improve the recovery rate of bacterial protein.

[0004] This application provides a bacterial cell protein concentration system, the system comprising:

[0005] Raw material liquid tank, used to store residual distillate of bacterial protein;

[0006] A primary centrifuge, wherein the inlet of the primary centrifuge is connected to the outlet of the raw material tank;

[0007] A primary concentrate tank, the inlet of which is connected to the concentrate outlet of the primary centrifuge, is used to temporarily store the primary centrifugal concentrate.

[0008] A secondary centrifuge, wherein the inlet of the secondary centrifuge is connected to the outlet of the primary concentrate tank, and the clarified liquid outlet of the secondary centrifuge is connected to the raw material tank;

[0009] A secondary concentrate tank, connected to the concentrate outlet of the secondary centrifuge, is used for temporary storage of the secondary centrifuged concentrate; and

[0010] A drying tower, the inlet of which is connected to the outlet of the secondary concentrate tank.

[0011] Optionally, the system further includes:

[0012] The inlet of the clear liquid tank is connected to the clear liquid outlet of the primary centrifuge, and the outlet of the clear liquid tank is connected to the sewage treatment system.

[0013] Optionally, the system further includes:

[0014] A first filter, located between the raw material tank and the primary centrifuge, is used to remove solid impurities from the residual distillate of the bacterial protein; and / or,

[0015] The second filter is located between the primary concentrate tank and the secondary centrifuge, and is used to remove solid impurities from the primary centrifuged concentrate.

[0016] Optionally, the system further includes:

[0017] Rotary pump, wherein the rotary pump is located between the primary concentrate tank and the secondary centrifuge; and / or,

[0018] A plunger pump is located between the secondary concentrate tank and the drying tower.

[0019] Optionally, the primary centrifuge is a disc centrifuge; and / or,

[0020] The secondary centrifuge is a horizontal spiral sedimentation centrifuge.

[0021] Optionally, the drying tower is a spray drying tower.

[0022] Optionally, the primary concentrate tank is equipped with a stirring component; and / or,

[0023] The secondary concentrate tank is equipped with a stirring component.

[0024] Optionally, the system further includes: an alkaline washing device for alkaline washing of the primary centrifuge and the secondary centrifuge, the alkaline washing device comprising:

[0025] An alkaline washing tank, the outlet of which is connected to the inlet of the primary centrifuge and the inlet of the secondary centrifuge, is used to store alkaline solution;

[0026] An alkaline washing liquid tank has an inlet connected to the liquid outlet of the primary centrifuge and the liquid outlet of the secondary centrifuge, a first outlet connected to the alkaline washing tank, and a second outlet connected to the wastewater treatment system.

[0027] The centrifugal sludge tank has its inlet connected to the concentrated liquid outlet of the primary centrifuge and the concentrated liquid outlet of the secondary centrifuge, and its outlet connected to the wastewater treatment system.

[0028] Optionally, the system further includes: an acid washing device for acid washing of the primary centrifuge and the secondary centrifuge, the acid washing device comprising:

[0029] A pickling tank, the outlet of which is connected to the inlet of the primary centrifuge and the inlet of the secondary centrifuge, is used to store alkaline solution;

[0030] The pickling solution tank has an inlet connected to the clear liquid outlet of the primary centrifuge and the clear liquid outlet of the secondary centrifuge, a first outlet connected to the pickling tank, and a second outlet connected to the wastewater treatment system.

[0031] The centrifugal sludge tank has its inlet connected to the concentrated liquid outlet of the primary centrifuge and the concentrated liquid outlet of the secondary centrifuge, and its outlet connected to the wastewater treatment system.

[0032] Optionally, the system further includes: a rinsing water device for washing the primary centrifuge and the secondary centrifuge, the rinsing water device comprising:

[0033] A rinsing water tank, the outlet of which is connected to the inlet of the primary centrifuge and the inlet of the secondary centrifuge, and the clear liquid outlet of the primary centrifuge and the clear liquid outlet of the secondary centrifuge are connected to the inlet of the raw material liquid tank;

[0034] The centrifugal sludge tank has its inlet connected to the concentrated liquid outlet of the primary centrifuge and the concentrated liquid outlet of the secondary centrifuge, and its outlet connected to the wastewater treatment system.

[0035] The technical solutions provided in this application have the following advantages compared with the prior art:

[0036] This application provides a bacterial protein concentration system that achieves efficient concentration of bacterial protein in distillate through continuous operation of primary and secondary centrifuges, thereby improving protein recovery rate. Simultaneously, the supernatant from the secondary centrifuge contains a high level of bacterial protein and is returned to the raw material tank for further centrifugation, further enhancing protein recovery efficiency. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1This is a schematic diagram of the structure of the bacterial protein concentration system provided in the embodiments of this application;

[0040] Figure 2 A schematic diagram of the alkaline washing device in the bacterial protein concentration system provided in the embodiments of this application;

[0041] Figure 3 A schematic diagram of the acid washing device in the bacterial protein concentration system provided in the embodiments of this application;

[0042] Figure 4 A schematic diagram of the rinsing water washing device in the bacterial protein concentration system provided in the embodiments of this application;

[0043] Figure label:

[0044] 1-Raw material tank, 2-First-stage centrifuge, 3-First-stage concentrate tank, 4-Second-stage centrifuge, 5-Second-stage concentrate tank, 6-Drying tower, 7-Clear liquid tank, 8-Residual distillate of Clostridium ethanol protein, 9-Second-stage centrifugal clear liquid, 10-First-stage centrifugal clear liquid, 11-Wastewater treatment system, 12-Clostridium ethanol protein powder, 13-Alkali washing tank, 14-Alkali washing clear liquid tank, 15-Centrifugal residue tank, 16-Alkali solution, 17-Acid solution tank, 18-Acid washing clear liquid tank, 19-Acid solution, 20-Rinsing water tank, 21-Process water. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] It should be noted that all directional indications in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture, as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, or a magnetic connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] Figure 1 This is a schematic diagram of the structure of the bacterial protein concentration system provided in the embodiments of this application.

[0049] like Figure 1 As shown, this application provides a bacterial protein concentration system, the system comprising:

[0050] Raw material liquid tank 1 is used to store residual distillate of bacterial protein;

[0051] A primary centrifuge 2, the inlet of which is connected to the outlet of the raw material tank 1;

[0052] A primary concentrate tank 3, the inlet of which is connected to the concentrate outlet of the primary centrifuge 2, is used to temporarily store the primary centrifugal concentrate.

[0053] A secondary centrifuge 4, the inlet of which is connected to the outlet of the primary concentrate tank 3, and the clear liquid outlet of the secondary centrifuge 4 is connected to the raw material tank 1;

[0054] A secondary concentrate tank 5, connected to the concentrate outlet of the secondary centrifuge 4, is used for temporary storage of the secondary centrifugal concentrate; and

[0055] Drying tower 6, the inlet of which is connected to the outlet of the secondary concentrate tank 5.

[0056] In some embodiments, the system further includes:

[0057] The inlet of the clear liquid tank 7 is connected to the clear liquid outlet of the primary centrifuge 2, and the outlet of the clear liquid tank 7 is connected to the sewage treatment system 11.

[0058] Specifically, the bacterial protein concentration system provided in this application includes: a raw material tank 1, which is a temporary storage tank for the residual distillate of bacterial protein discharged from the distillation device; the residual distillate 8 of *Fusobacterium ethanolis* is pressurized by a pump and enters a primary centrifuge 2. The primary centrifuge 2 is a primary centrifugal concentration device for the residual protein distillate; after concentration by the primary centrifuge 2, the concentrated liquid enters a primary concentrate tank 3, and the clarified liquid enters a clarified liquid tank 7. The clarified liquid tank 7 is a temporary storage tank for the clarified liquid 10 from the primary centrifuge; the clarified liquid in the clarified liquid tank 7 is pumped to a wastewater treatment system 11 for purification. The primary concentrate tank 3 is a temporary storage tank for the concentrated liquid from the primary centrifuge 2; the liquid in the primary concentrate tank 3 is pumped to a secondary centrifuge 4 for further concentration. A secondary centrifuge 4 is a device for further concentrating the concentrate from the primary centrifuge. The secondary centrifuged concentrate enters a secondary concentrate tank 5. The secondary centrifuged clarified liquid 9, containing a high level of bacterial protein, is discharged into a raw material tank 1 for recycling and further centrifugation. The secondary concentrate tank 5 serves as a temporary storage tank for the concentrate from the secondary centrifuge 4. The liquid in the secondary concentrate tank 5 is pumped to a drying tower 6 for spray drying. The drying tower 6 is a device for drying Clostridium ethanolis protein. The liquid in the secondary concentrate tank 5 is pumped into the drying tower 6, where it is sprayed into a mist by a high-pressure nozzle and comes into contact with drying air to form Clostridium ethanolis protein powder 12.

[0059] In some embodiments, the system further includes:

[0060] A first filter, located between the raw material tank 1 and the primary centrifuge 2, is used to remove solid impurities from the residual distillate of the bacterial protein; and / or,

[0061] The second filter is located between the primary concentrate tank 3 and the secondary centrifuge 4, and is used to remove solid impurities from the primary centrifuged concentrate.

[0062] A filter is installed before the residual distillate from the bacterial protein enters the first-stage centrifuge (2) to prevent solid impurities from entering the centrifuge and clogging the flow channels, thus affecting centrifuge operation. Similarly, a filter is installed before the concentrated liquid from the first-stage centrifuge enters the second-stage centrifuge (4) to prevent solid impurities from entering the centrifuge and clogging the flow channels, thus affecting centrifuge operation.

[0063] In some embodiments, the system further includes:

[0064] Rotary pump, wherein the rotary pump is located between the primary concentrate tank 3 and the secondary centrifuge 4; and / or,

[0065] A plunger pump is located between the secondary concentrate tank 5 and the drying tower 6.

[0066] The secondary concentrate is transported to drying tower 6 using a plunger pump, which can effectively prevent high-concentration bacterial protein liquid from clogging the pump and increase the delivery pressure to achieve a better spraying effect.

[0067] In some embodiments, the primary centrifuge 2 is a disc centrifuge; and / or,

[0068] The secondary centrifuge 4 is a horizontal spiral sedimentation centrifuge.

[0069] The second centrifuge uses a horizontal spiral sedimentation centrifuge, which can effectively improve the concentration effect.

[0070] In some embodiments, the drying tower 6 is a spray drying tower 6.

[0071] In some embodiments, the primary concentrate tank 3 is equipped with a stirring component; and / or,

[0072] The secondary concentrate tank 5 is equipped with a stirring component.

[0073] The primary concentrate tank 3 is equipped with a stirring device to prevent the primary centrifuged concentrate from settling at the bottom of the tank. Similarly, the secondary concentrate tank 5 is equipped with a stirring device to prevent the secondary centrifuged concentrate from settling at the bottom of the tank.

[0074] Figure 2 This is a schematic diagram of the alkaline washing device in the bacterial protein concentration system provided in the embodiments of this application.

[0075] In some implementations, such as Figure 2 As shown, the system further includes: an alkaline washing device for alkaline washing of the primary centrifuge 2 and the secondary centrifuge 4, the alkaline washing device comprising:

[0076] Alkali washing tank 13, the outlet of which is connected to the inlet of the primary centrifuge 2 and the inlet of the secondary centrifuge 4, is used to store alkali solution 16;

[0077] Alkaline washing liquid tank 147, the inlet of which is connected to the liquid outlet of the first-stage centrifuge 2 and the liquid outlet of the second-stage centrifuge 4, the first outlet of which is connected to the alkaline washing tank 13, and the second outlet of which is connected to the sewage treatment system 11.

[0078] The centrifugal sludge tank 15 has its inlet connected to the concentrated liquid outlet of the primary centrifuge 2 and the concentrated liquid outlet of the secondary centrifuge 4, and its outlet connected to the wastewater treatment system 11.

[0079] The alkaline solution 16 from the alkaline washing device is pumped to the primary centrifuge 2 and the secondary centrifuge 4 to wash away bacterial protein impurities adhering to the centrifuges, preventing blockage of the centrifuge channels and affecting the centrifugation effect. The clear alkaline solution 16 tank has drain outlets at the bottom and lower middle section. After sedimentation in the tank, the liquid containing solid impurities at the bottom is discharged into the wastewater treatment device, while the clear liquid at the top is discharged back into the alkaline solution 16 tank for recycling through the lower middle outlet.

[0080] In some implementations, to achieve better cleaning results, the cleaning alkali solution 16 in tank 16 is heated to 60-70°C before cleaning.

[0081] Figure 3 This is a schematic diagram of the acid washing device in the bacterial protein concentration system provided in the embodiments of this application.

[0082] In some implementations, such as Figure 3 As shown, the system further includes: an acid washing device for acid washing of the primary centrifuge 2 and the secondary centrifuge 4, the acid washing device comprising:

[0083] A pickling tank, the outlet of which is connected to the inlet of the primary centrifuge 2 and the inlet of the secondary centrifuge 4, is used to store alkaline solution 16;

[0084] The pickling solution tank 187 has an inlet connected to the clear liquid outlet of the primary centrifuge 2 and the clear liquid outlet of the secondary centrifuge 4, a first outlet connected to the pickling tank, and a second outlet connected to the wastewater treatment system 11.

[0085] The centrifugal sludge tank 15 has its inlet connected to the concentrated liquid outlet of the primary centrifuge 2 and the concentrated liquid outlet of the secondary centrifuge 4, and its outlet connected to the wastewater treatment system 11.

[0086] The acid solution 19 from the pickling device is pumped to the primary centrifuge 2 and the secondary centrifuge 4 to clean away inorganic impurities adhering to the centrifuges and prevent blockage of the centrifuge channels, thus affecting the centrifugation effect. The clarified acid solution 19 tank 17 has drain outlets at the bottom and lower middle section. After sedimentation in the tank, the liquid containing solid impurities at the bottom of the clarified acid solution 19 is discharged into the centrifuge residue tank 15, while the upper clarified liquid is discharged through the lower middle outlet back into the acid solution 19 tank 17 for recycling.

[0087] In some embodiments, to achieve better cleaning results, the cleaning alkali solution 16 in the acid solution 19 tank 17 is heated to 60-70°C before cleaning.

[0088] Figure 4This is a schematic diagram of the rinsing water washing device in the bacterial protein concentration system provided in the embodiments of this application.

[0089] In some implementations, such as Figure 4 As shown, the system further includes: a rinsing water device for washing the primary centrifuge 2 and the secondary centrifuge 4, the rinsing water device comprising:

[0090] The outlet of the rinsing water tank 20 is connected to the inlet of the primary centrifuge 2 and the inlet of the secondary centrifuge 4, and the clear liquid outlet of the primary centrifuge 2 and the clear liquid outlet of the secondary centrifuge 4 are connected to the inlet of the raw material liquid tank 1.

[0091] The centrifugal sludge tank 15 has its inlet connected to the concentrated liquid outlet of the primary centrifuge 2 and the concentrated liquid outlet of the secondary centrifuge 4, and its outlet connected to the wastewater treatment system 11.

[0092] The alkali solution 16 or acid solution 19 inside the centrifuge is washed away with clean water. During the clean water rinsing process, the clean liquid is transferred to the clean liquid tank 7, and the concentrated liquid is transferred to the centrifuge residue tank 15. The centrifuge residue tank 15 is a temporary storage tank for the concentrated liquid from the alkaline washing, acid washing, and clean water rinsing processes of the primary centrifuge 2 and the secondary centrifuge 4. The liquid in the tank is pumped to the wastewater treatment system 11 for treatment.

[0093] In some embodiments, a period of rinsing with clean water is performed after alkaline washing and acid washing, respectively, to prevent residual alkaline solution 16 and acid solution 19 in the centrifuge from adversely affecting the subsequent cleaning and centrifugation processes.

[0094] In summary, the advantages of the bacterial protein concentration system provided in this application are as follows:

[0095] (1) High-efficiency concentration and recovery: The system achieves high-efficiency concentration of bacterial protein residual water through the continuous operation of primary and secondary centrifuges, thereby improving the protein recovery rate. The supernatant from the secondary centrifuge contains a high level of bacterial protein and is discharged back into the raw material tank for further centrifugation, further improving the protein recovery efficiency.

[0096] (2) Optimized process flow: The system is reasonably designed and the connections between the components are tight, ensuring the smooth operation of the process flow. By setting up temporary storage tanks such as raw material tanks, primary concentrate tanks, and secondary concentrate tanks, the flow fluctuations during the production process are effectively buffered, improving the stability of the system.

[0097] (3) Solid impurity treatment: The system is equipped with a first filter and a second filter, which can effectively remove solid impurities from the residual distillate of bacterial protein and the concentrated liquid from the first centrifugation, preventing blockage of the centrifuge flow channel and ensuring the normal operation of the centrifuge. At the same time, the setting of the stirring component prevents the concentrated liquid from settling at the bottom of the tank, further ensuring the concentration effect.

[0098] (4) Precise control: The system can achieve precise control of the concentration process by adjusting parameters such as the centrifuge speed and pump flow rate, ensuring the consistency and stability of product quality. The drying tower adopts spray drying technology, which can quickly convert the concentrate into microbial protein powder, retaining the active ingredients of the protein.

[0099] (5) Energy saving and environmental protection: During operation, the system reduces energy consumption and costs by precisely controlling the amount of cooling water, heating alkaline solution or acid solution, etc. At the same time, the design of equipment such as centrifuges and drying towers takes into account the requirements of energy saving and environmental protection, reducing the emission of waste gas and wastewater.

[0100] (6) Cleaning and Maintenance: The system is equipped with alkaline washing, acid washing, and rinsing water washing devices, which can regularly clean the centrifuge to prevent clogging and corrosion and extend the service life of the equipment. At the same time, the waste liquid generated during the cleaning process can be recycled or safely discharged into the sewage treatment system after sedimentation and separation, reducing the impact on the environment.

[0101] (7) High adaptability: The system can adjust process parameters and equipment configuration according to different raw materials and production needs to meet the production requirements of bacterial protein of different specifications and qualities. At the same time, by optimizing the type of centrifuge and the structure of the drying tower, the system can be applied to the concentration and drying of a variety of bacterial proteins.

[0102] The embodiments of this application are further illustrated below with reference to specific examples. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to industry standards; if there is no corresponding industry standard, they are performed according to general international standards, conventional conditions, or conditions recommended by the manufacturer.

[0103] In this embodiment of the invention, the bacterial protein residual water 8 is the bottom liquid of the distillation column, containing 10-20 g / L of ethanol Clostridium somatic protein.

[0104] Raw material tank 1 is a temporary storage tank for bacterial protein residual distillate 8. The ethanol fusobacterium bacterial protein residual distillate 8 is pumped to the first-stage centrifuge 2.

[0105] The first-stage centrifuge 2 is a primary concentration device for the residual distillate water 8 containing ethanol Clostridium somatic protein. To achieve better concentration, the first-stage centrifuge uses a disc centrifuge. After concentration treatment by the first-stage centrifuge 2, the concentration of ethanol Clostridium somatic protein in the first-stage centrifuge concentrate reaches 80-100 g / L. The first-stage centrifuge concentrate enters the first-stage concentrate tank 3. The concentration of ethanol Clostridium somatic protein in the first-stage centrifuge clear liquid 10 is below 0.2 g / L. The first-stage centrifuge clear liquid 10 enters the clear liquid tank 7.

[0106] The primary concentrate tank 3 serves as a temporary storage tank for the primary centrifuge concentrate. An agitator is installed inside the tank to prevent sedimentation of the primary centrifuge concentrate. The liquid in the primary concentrate tank 3 is then pumped by a rotary pump to the secondary centrifuge 4 for further concentration.

[0107] The secondary centrifuge 4 is a secondary centrifugation and concentration device for Clostridium ethanolis protein solution. To achieve better concentration, the secondary centrifuge uses a horizontal spiral sedimentation centrifuge. After secondary centrifugation, the concentration of Clostridium ethanolis protein in the secondary centrifuge concentrate reaches 400-500 g / L. The secondary centrifuge concentrate enters the secondary concentrate tank 5, and the secondary centrifuge clear liquid 9 has a concentration of 5-8 g / L of Clostridium ethanolis protein. The secondary centrifuge clear liquid 9 enters the raw material liquid tank 1 for recycling.

[0108] Secondary concentrate tank 5 is a temporary storage tank for secondary centrifugal concentrate. The secondary concentrate tank 5 is pressurized to above 1.0 MPa by a plunger pump and transported to drying tower 6.

[0109] Drying tower 6 is a spray drying device for Clostridium ethanolis protein. After being pressurized by the secondary centrifugation, the concentrated liquid is sprayed out through the nozzle in the form of a mist, and comes into contact with the drying air in the drying tower. The water is evaporated to form Clostridium ethanolis protein powder 12.

[0110] Clear liquid tank 7 is a temporary storage tank for primary centrifugal clear liquid 10. The liquid in clear liquid tank 7 is pumped to the sewage treatment system for purification.

[0111] Alkaline washing tank 13 serves as a storage tank for the alkaline washing solution from the primary centrifuge 2 and the secondary centrifuge 4. The alkaline washing solution is pumped to the primary centrifuge 2 and the secondary centrifuge 4 to remove bacterial impurities adhering to the centrifuges, preventing the accumulation of impurities from affecting the centrifugation effect. The alkaline washing solution is a 1.5%–2% sodium hydroxide solution by mass. To achieve better cleaning results, the alkaline washing solution is heated to 70–80°C before use.

[0112] During the alkaline washing process of centrifuges 2 and 4, the concentrated alkaline washing liquid contains more insoluble impurities and is discharged into centrifuge residue tank 15, while the clear alkaline washing liquid contains fewer impurities and is discharged into alkaline washing clear liquid tank 14.

[0113] The alkaline washing solution tank 14 serves as a storage tank for the centrifugal solution from the primary centrifuge 2 and the secondary centrifuge 4 during the alkaline washing process. The alkaline washing solution tank 14 has discharge ports at the bottom and lower middle sections. After static sedimentation in the alkaline washing solution tank 14, the sediment at the bottom is discharged through the bottom discharge port to the wastewater treatment system for purification. The settled solution discharged from the lower middle discharge port is returned to the alkaline washing tank 13 for recycling.

[0114] Alkali solution 16 is a 30%–32% sodium hydroxide solution, used to prepare a 1.5%–2% sodium hydroxide alkaline washing solution with an appropriate amount of water, and then heated to 70–80°C by steam before use.

[0115] Pickling tank 17 serves as a storage tank for the pickling solution from the primary centrifuge 2 and the secondary centrifuge 4. The pickling solution is pumped to the primary centrifuge 2 and the secondary centrifuge 4 to remove inorganic impurities adhering to the centrifuges, preventing the accumulation of impurities from affecting the centrifugation effect. The pickling solution is a 0.5%–1.0% nitric acid solution by mass. To achieve better cleaning results, the pickling solution is heated to 60–70°C before use.

[0116] During the pickling process, the concentrated pickling liquid from the primary centrifuge 2 and the secondary centrifuge 4 contains a large amount of insoluble impurities and is discharged into the centrifuge residue tank 15. The clear pickling liquid contains fewer impurities and is discharged into the clear pickling liquid tank 18.

[0117] Pickling solution tank 18 serves as a storage tank for the centrifugal solution from the primary centrifuge 2 and the secondary centrifuge 4 pickling process. The pickling solution tank 18 has discharge ports at the bottom and lower middle sections. After settling in the pickling solution tank 18, the sediment at the bottom is discharged through the bottom discharge port to the wastewater treatment system for purification. The settled solution discharged from the lower middle discharge port is returned to the pickling tank 17 for recycling.

[0118] Acid solution 19 is a nitric acid solution with a concentration of about 60%. It is used to prepare a nitric acid pickling solution with an appropriate amount of water to a mass fraction of 0.5% to 1.0%, and then heated with steam to 60 to 70°C before use.

[0119] Rinse water tank 20 is a storage tank for clean water rinsing of primary centrifuge 2 and secondary centrifuge 4. Primary centrifuge 2 and secondary centrifuge 4 are rinsed with water for a short time after alkaline washing, acid washing and acid washing are completed to replace the original liquid in the centrifuge. In order to achieve better rinsing effect, the acid washing solution is heated to 60-70℃ before use.

[0120] During the water rinsing process of the primary centrifuge 2 and the secondary centrifuge 4, the concentrated liquid from the water rinsing centrifuge contains some impurities and is discharged to the centrifuge residue tank 15, while the clear liquid from the water rinsing centrifuge is discharged into the clear liquid tank 7.

[0121] Centrifugal residue tank 15 is a temporary storage tank for concentrated centrifugal liquid during the acid washing, alkali washing, and water rinsing processes of the primary centrifuge 2 and the secondary centrifuge 4. The liquid in centrifugal residue tank 15 is pumped to the sewage treatment system for purification.

[0122] In summary, this method can increase the concentration of Clostridium ethanolis protein and recycle the cleaning solution, reducing energy and chemical consumption and achieving the goals of economic efficiency, energy conservation, and environmental protection.

[0123] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0124] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A bacterial protein concentration system, the system comprising: Raw material liquid tank (1) is used to store residual distillate of bacterial protein; A primary centrifuge (2), the inlet of which is connected to the outlet of the raw material tank (1); A primary concentrate tank (3) is provided, the inlet of which is connected to the concentrate outlet of the primary centrifuge (2) for temporarily storing the primary centrifugal concentrate. A secondary centrifuge (4) is provided, the inlet of which is connected to the outlet of the primary concentrate tank (3), and the clear liquid outlet of which is connected to the raw material tank (1). A secondary concentrate tank (5), which is connected to the concentrate outlet of the secondary centrifuge (4), is used to temporarily store the secondary centrifugal concentrate; and The drying tower (6) has its inlet connected to the outlet of the secondary concentrate tank (5).

2. The system according to claim 1, characterized in that, The system also includes: The inlet of the clear liquid tank (7) is connected to the clear liquid outlet of the first-stage centrifuge (2), and the outlet of the clear liquid tank (7) is connected to the sewage treatment system (11).

3. The system according to claim 1, characterized in that, The system also includes: A first filter, located between the raw material tank (1) and the primary centrifuge (2), is used to remove solid impurities from the residual distillate of the bacterial protein; and / or, The second filter is located between the primary concentrate tank (3) and the secondary centrifuge (4) to remove solid impurities from the primary centrifuged concentrate.

4. The system according to claim 1, characterized in that, The system also includes: A rotary pump, wherein the rotary pump is located between the primary concentrate tank (3) and the secondary centrifuge (4); and / or, A plunger pump is located between the secondary concentrate tank (5) and the drying tower (6).

5. The system according to claim 1, characterized in that, The primary centrifuge (2) is a disc centrifuge; and / or, The secondary centrifuge (4) is a horizontal spiral sedimentation centrifuge.

6. The system according to claim 1, characterized in that, The drying tower (6) is a spray drying tower (6).

7. The system according to claim 1, characterized in that, The primary concentrate tank (3) is equipped with a stirring component; and / or, The secondary concentrate tank (5) is equipped with a stirring component.

8. The system according to claim 1, characterized in that, The system further includes: an alkaline washing device for alkaline washing of the primary centrifuge (2) and the secondary centrifuge (4), the alkaline washing device comprising: Alkali washing tank (13), the outlet of which is connected to the inlet of the first-stage centrifuge (2) and the inlet of the second-stage centrifuge (4), is used to store alkali solution (16); Alkaline washing liquid tank (14)(7), the inlet of the alkaline washing liquid tank (14)(7) is connected to the liquid outlet of the first centrifuge (2) and the liquid outlet of the second centrifuge (4), the first outlet of the alkaline washing liquid tank (14)(7) is connected to the alkaline washing tank (13), and the second outlet of the alkaline washing liquid tank (14)(7) is connected to the sewage treatment system (11); Centrifugal sludge tank (15), the inlet of which is connected to the concentrated liquid outlet of the first-stage centrifuge (2) and the concentrated liquid outlet of the second-stage centrifuge (4), and the outlet of which is connected to the sewage treatment system (11).

9. The system according to claim 1, characterized in that, The system further includes: an acid washing device for acid washing of the primary centrifuge (2) and the secondary centrifuge (4), the acid washing device comprising: A pickling tank, the outlet of which is connected to the inlet of the primary centrifuge (2) and the inlet of the secondary centrifuge (4), is used to store alkaline solution (16); A pickling solution tank (18)(7) has an inlet connected to the clear liquid outlet of the primary centrifuge (2) and the clear liquid outlet of the secondary centrifuge (4), a first outlet connected to the pickling tank, and a second outlet connected to the wastewater treatment system (11). Centrifugal sludge tank (15), the inlet of which is connected to the concentrated liquid outlet of the first-stage centrifuge (2) and the concentrated liquid outlet of the second-stage centrifuge (4), and the outlet of which is connected to the sewage treatment system (11).

10. The system according to claim 1, characterized in that, The system further includes: a rinsing water device for washing the primary centrifuge (2) and the secondary centrifuge (4), the rinsing water device comprising: A rinsing water tank (20) is provided, the outlet of which is connected to the inlet of the primary centrifuge (2) and the inlet of the secondary centrifuge (4), and the clear liquid outlet of the primary centrifuge (2) and the clear liquid outlet of the secondary centrifuge (4) are connected to the inlet of the raw material liquid tank (1). Centrifugal sludge tank (15), the inlet of which is connected to the concentrated liquid outlet of the first-stage centrifuge (2) and the concentrated liquid outlet of the second-stage centrifuge (4), and the outlet of which is connected to the sewage treatment system (11).

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