Multi-stage separation and recovery method for processing euphausia superba powder
Through a multi-stage separation and recycling process, a system consisting of a drum screen, a twin-screw extruder, and a centrifuge was developed, which solved the problem of low separation efficiency of domestically produced horizontal screw centrifuges. This enabled efficient separation and resource utilization of Antarctic krill powder, and improved drying efficiency and shrimp oil quality.
Patent Information
- Application Number
- CN202511121539.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-11-18
AI Technical Summary
In existing technologies, the separation efficiency of domestically produced horizontal screw centrifuges is relatively low, resulting in high moisture content in the materials during Antarctic krill powder processing, which affects the drying effect. Furthermore, the recovery and utilization rate of solids in liquid materials is low, causing resource waste and environmental pollution.
A multi-stage separation system consisting of a drum screen, a twin-screw extruder, a horizontal screw centrifuge, and a disc centrifuge, combined with a recovery tank and drying and pulverizing equipment, improves the recovery rate and separation efficiency of solids and reduces moisture content through multi-stage separation and recovery processes.
Through multi-stage separation and recycling processes, the shrimp powder yield was increased by more than 5%, the moisture content was reduced to 60-63%, the drying efficiency was increased by more than 10%, and the quality and storage life of shrimp oil were improved, while reducing environmental pollution.
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Figure CN120961317A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of krill powder processing and separation, and in particular to a multi-stage separation and recovery method for Antarctic krill powder processing. Background Technology
[0002] Shrimp meal is the most important processed product from Antarctic krill onboard processing. Its processing steps mainly include cooking, separation, drying, and grinding. The main purpose of the separation step is to achieve solid-liquid separation of the cooked krill material, reducing the initial moisture content and improving subsequent drying efficiency. Currently, in developed krill-producing countries such as Norway, the separation process in shrimp meal processing mainly uses horizontal centrifuges to separate the cooked material into solid, liquid, and oil phases. The solid phase enters the subsequent drying process, the liquid phase is separated using disc centrifuges, and the oil phase is crude krill oil, used for subsequent krill oil refining. However, there is a lack of effective recovery technology during processing.
[0003] However, domestically produced decanter centrifuges currently lag significantly behind their foreign counterparts in performance. Foreign decanter centrifuges can reach speeds of up to 4200 rpm, achieving relatively better separation results, with the separated material typically containing 65-68% moisture. Domestically produced decanter centrifuges, on the other hand, typically operate at around 3000 rpm, resulting in poorer separation and a moisture content of 70-72% in the separated material. Directly adopting foreign krill processing methods will lead to high material moisture content, which negatively impacts subsequent drying efficiency and prolongs drying time.
[0004] Furthermore, the separated liquid materials all contain some solids. When using a static filter to recover the solids, the filter is prone to clogging. Therefore, in actual production, some liquid materials containing solids are often directly discharged, resulting in low overall utilization. Summary of the Invention
[0005] This application provides a multi-stage separation and recovery method for Antarctic krill powder processing, which solves the problems in the prior art where the processing of Antarctic krill powder relies on the high performance of horizontal screw centrifuges and has a low utilization rate of solids recovery.
[0006] This application provides a multi-stage separation and recovery method for processing Antarctic krill powder, which adopts the following technical solution:
[0007] A multi-stage separation and recovery method for processing Antarctic krill meal, the method comprising the following steps:
[0008] The drum screen equipment separates the cooked Antarctic krill material to obtain primary solid phase and primary liquid phase separation.
[0009] The twin-screw extruder extrudes the first-stage solid phase separator, the third-stage solid phase separator, and the fourth-stage solid phase separator to obtain the second-stage solid phase separator and the second-stage liquid phase separator;
[0010] A three-stage separation device separates the primary liquid phase product and the secondary liquid phase product to obtain the tertiary solid phase product, the tertiary liquid phase product, and the tertiary oil phase product;
[0011] The centrifuge assembly repeatedly separates the three-stage liquid phase fraction to obtain the four-stage solid phase fraction, crude shrimp oil, oil-water mixture, and aqueous phase fraction.
[0012] The recovery tank collects the aqueous phase separation material and processes it according to control commands from the user.
[0013] The drying and pulverizing equipment dries and pulverizes the secondary solid phase separator and the oil-water mixture to obtain the target shrimp powder.
[0014] Optionally, the drum rotation speed of the drum screen is 20-40 r / min, and the screen mesh size is 0.2-0.6 mm; the three-stage separation equipment is a horizontal screw centrifuge with a centrifugal rotation speed of 3000-3500 r / min and a single separation working time of 2-3 min.
[0015] Optionally, the centrifugal assembly repeatedly separates the three-stage liquid phase fraction to obtain the four-stage solid phase fraction, oil-water mixture, and aqueous phase fraction, including:
[0016] The first centrifuge separates the three-stage liquid phase separators to obtain the fourth-stage solid phase separator at the bottom, the fourth-stage oil-water mixture at the middle, the fourth-stage oil phase separator at the top, and the fourth-stage aqueous phase separator at the bottom.
[0017] The second centrifuge separates the four-stage oil phase fraction to obtain a five-stage oil phase fraction in the upper layer, a five-stage oil-water mixture in the lower layer, and a five-stage aqueous phase fraction in the lower layer.
[0018] The oil-water mixture includes the fourth-stage oil-water mixture and the fifth-stage oil-water mixture, the aqueous phase separator includes the fourth-stage aqueous phase separator and the fifth-stage aqueous phase separator, and the fifth-stage oil phase separator is the crude shrimp oil.
[0019] Optionally, the first centrifugal device is a first disc centrifuge with a centrifugation speed of 5000-6000 r / m and a single separation time of 1-2 min; the second centrifugal device is a second disc centrifuge with a centrifugation speed of 10000-12000 r / m and a single separation time of 2-3 min.
[0020] Optionally, the recovery tank collects the aqueous phase separation and processes the aqueous phase separation according to control instructions from the user, including:
[0021] When the control command instructs the shrimp powder to be used for feed processing, a protein flocculant is added to the recovery tank to flocculate the aqueous phase separator to obtain protein recovery and water. The water is discharged, and the protein recovery is dried and pulverized by a drying and pulverizing equipment to be used as one of the components of shrimp powder.
[0022] When the control command instructs the shrimp powder to be used for shrimp oil extraction, the recovery tank stores the aqueous phase separator.
[0023] Optionally, the twin-screw extrusion device has an extrusion feed port and an extrusion discharge port. The extrusion feed port is used to receive the primary solid phase separator, the tertiary solid phase separator, and the quaternary solid phase separator, and the extrusion discharge port is used to output the secondary solid phase separator and the secondary liquid phase separator.
[0024] Optionally, the solid discharge port of the drum screen equipment is connected to the feed port of the twin-screw extruder, and the third-stage and fourth-stage solid phase separators are transported to the feed port of the twin-screw extruder via a screw pump.
[0025] Optionally, the drying and pulverizing equipment includes a drying device and a pulverizing device. The drying device has two drying inlets and one drying outlet. The two drying inlets are a front-stage drying inlet and a mid-to-rear-stage recovery inlet, respectively. The front-stage drying inlet is used to receive the secondary solid phase separation product and the protein recovery product, and the mid-to-rear-stage recovery inlet is used to receive the oil-water mixture.
[0026] Optionally, the oil-water mixture is pumped to the middle and rear section recovery inlet, and a spray head is installed. When the moisture content of the material in the drying equipment is 40-50%, it is sprayed into the drying equipment in an intermittent spraying manner.
[0027] Optionally, the protein recovery is dehydrated by a three-legged centrifuge and then conveyed to the front-end drying inlet.
[0028] This application includes at least one of the following beneficial technical effects:
[0029] 1. The secondary liquid phase separated material output from the twin-screw extruder is separated into tertiary solid phase separated material by a tertiary separation device. This tertiary solid phase separated material is then fed back to the twin-screw extruder to form a primary recovery.
[0030] 2. The centrifugal assembly separates the three-stage liquid phase material into a four-stage solid phase material, which is then fed to a twin-screw extruder to form a two-stage recovery process.
[0031] 3. The centrifugal assembly separates the three-stage liquid phase components to obtain an oil-water mixture, which is then fed to a drying and pulverizing device to produce the target shrimp powder, thus forming a three-stage recovery process.
[0032] 4. When the control command instructs the shrimp powder to be used for feed processing, the recovery tank performs flocculation treatment on the aqueous phase to obtain protein recovery material, which is then fed to the drying and pulverizing equipment to generate the target shrimp powder, forming a four-stage recovery process.
[0033] 5. Through multi-stage recycling processes, the yield of shrimp powder is improved. Experimental calculations show that the yield of shrimp powder can be increased by more than 5%; the protein content and lipids in the discharged water are reduced, thus mitigating environmental pollution.
[0034] 6. After primary recovery, the centrifugal assembly performs multiple separations on the tertiary liquid phase. The fifth-stage oil phase separated product obtained after processing by the first and second centrifugal devices is used as crude shrimp oil. Compared with conventional disc centrifugation to directly obtain crude shrimp oil, the crude shrimp oil of this application has lower moisture content, which improves the quality and storage life of the shrimp oil.
[0035] 7. Through multi-stage recycling processes, the problem of low separation efficiency and high moisture content in the separated material is overcome by domestic horizontal screw centrifuge equipment. The moisture content of the separated material can be reduced to between 60-63%. According to experimental calculations, the drying efficiency can be improved by more than 10%. Attached Figure Description
[0036] Figure 1 This is a flowchart of a multi-stage separation and recovery method for processing Antarctic krill powder according to the present invention.
[0037] Figure 2 This is a block diagram of a multi-stage separation and recovery system for processing Antarctic krill powder according to the present invention.
[0038] Figure 3 yes Figure 2 A schematic diagram of the structure of a twin-screw extrusion equipment.
[0039] Figure 4 yes Figure 1 The flowchart for step 104.
[0040] Figure 5 yes Figure 2 A schematic diagram of the centrifuge assembly.
[0041] Figure 6 yes Figure 1 The flowchart for step 105.
[0042] Figure 7 yes Figure 5 A schematic diagram of the structure of the drying equipment.
[0043] Explanation of reference numerals in the attached figures:
[0044] 1. Rotary drum screen; 2. Twin-screw extrusion equipment; 3. Three-stage separation equipment; 4. Centrifuge assembly; 5. Recovery tank; 6. Drying and pulverizing equipment; 41. First centrifuge equipment; 42. Second centrifuge equipment; 61. Drying equipment; 62. Pulverizing equipment; 1a. First-stage solid phase separator; 1b. First-stage liquid phase separator; 2a. Second-stage solid phase separator; 2b. Second-stage liquid phase separator; 3a. Third-stage solid phase separator; 3b. Third-stage liquid phase separator; 3c. Third-stage oil phase separator; 4a. Fourth-stage solid phase separator; 4c. Fourth-stage oil phase separator; 4e. Fourth-stage oil-water mixture; 4f. Fourth-stage aqueous phase separator; 5c. Fifth-stage oil phase separator; 5e. Fifth-stage oil-water mixture; 5f. Detailed Implementation
[0045] The present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application.
[0046] In the following description, numerous specific details are set forth for illustrative purposes in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the accompanying drawings of this disclosure are block diagrams illustrating structures and devices to avoid complicating the disclosed principles. For clarity, not all features of the actual embodiment need to be described.
[0047] Unless explicitly defined, the terms “a,” “an,” and “the” are not intended to refer to a singular entity, but rather to include a general category that can be used to illustrate a particular example. Thus, the use of the terms “a” or “an” can mean any number of at least one, including “a,” “one or more,” “at least one,” and “one or more.”
[0048] This application discloses a multi-stage separation and recovery method for processing Antarctic krill powder. This multi-stage separation and recovery method is applied to a multi-stage separation and recovery system for processing Antarctic krill powder. (Reference) Figure 2 As shown, the multi-stage separation and recycling system includes a drum screen 1, a twin-screw extruder 2, a three-stage separation device 3, a centrifugal assembly 4, a recycling tank 5, and a drying and pulverizing device 6; the centrifugal assembly 4 includes a first centrifugal device 41 and a second centrifugal device 42, and the drying and pulverizing device 6 includes a drying device 61 and a pulverizing device 62.
[0049] The following details the implementation of a multi-stage separation and recovery method for Antarctic krill powder processing according to this embodiment. The following details are provided for ease of understanding and are not essential to this embodiment. For the specific process of this embodiment, please refer to [link / reference]. Figure 1 As shown, it includes the following steps:
[0050] Step 101: The drum screen equipment separates the cooked Antarctic krill material to obtain primary solid phase and primary liquid phase.
[0051] Specifically, the Antarctic krill material is first steamed and then conveyed to the feed inlet of a rotary drum screen 1. The drum of the rotary drum screen 1 rotates at a speed of 20-40 r / min, and the screen mesh size is 0.2-0.6 mm. During operation, the rotary drum screen 1 separates the Antarctic krill material into a primary solid phase separation 1a, which is blocked by the screen, and a primary liquid phase separation 1b, which passes through the screen. The rotary drum screen 1 can also be replaced with other screen equipment.
[0052] In one example, the drum screen 1 has a solid phase outlet and a liquid phase outlet. The solid phase outlet is located on the side of the screen closer to the inlet and is connected to the inlet of the twin-screw extruder 2 to introduce the primary solid phase separator 1a into the twin-screw extruder 2. The liquid phase outlet is located on the side of the screen away from the inlet and is connected to the inlet of the tertiary separation device 3 to introduce the primary liquid phase separator 1b into the tertiary separation device 3.
[0053] Step 102: The twin-screw extruder extrudes the first-stage solid phase separator, the third-stage solid phase separator, and the fourth-stage solid phase separator to obtain the second-stage solid phase separator and the second-stage liquid phase separator.
[0054] Specifically, refer to Figure 3 As shown, the twin-screw extruder 2 has an extrusion feed port and an extrusion discharge port. The extrusion feed port is used to receive the primary solid phase separator 1a, the tertiary solid phase separator 3a obtained after primary recovery, and the quaternary solid phase separator 4a obtained after secondary recovery. The extrusion discharge port is used to output the secondary solid phase separator 2a and the secondary liquid phase separator 2b.
[0055] In one example, the twin-screw extruder has a screen aperture of 0.5-1.0 mm, a compression ratio of 6:1, and a rotational speed of 100 rpm.
[0056] Step 103: The three-stage separation equipment separates the primary liquid phase and the secondary liquid phase to obtain the tertiary solid phase, the tertiary liquid phase, and the tertiary oil phase.
[0057] Specifically, the third stage of separation equipment is a horizontal decanter centrifuge, with a centrifugal speed of 3000-3500 rpm and a single separation time of 2-3 minutes. (Reference) Figure 2 and Figure 5As shown, the three-stage separation device 3 separates the primary liquid phase 1b from the drum screen 1 and the secondary liquid phase 2b from the twin-screw extruder 2, yielding a tertiary solid phase 3a, a tertiary liquid phase 3b, and a tertiary oil phase 3c. The secondary liquid phase 2b output from the twin-screw extruder 2 is separated by the three-stage separation device 3 to obtain a tertiary solid phase 3a, which is then fed back to the twin-screw extruder 2, forming a primary recovery.
[0058] Step 104: The centrifuge assembly separates the three-stage liquid phase fractions multiple times to obtain the four-stage solid phase fractions, crude shrimp oil, oil-water mixture, and aqueous phase fractions.
[0059] Specifically, refer to Figure 5 As shown, the centrifugal assembly 4 includes a first centrifuge 41 and a second centrifuge 42. The inlet of the first centrifuge 41 is connected to the three-stage separation device 3, and the outlet of the first centrifuge 41 is connected to the twin-screw extruder 2, the second centrifuge 42, the recovery tank 5, and the drying and pulverizing device 6. The oil-water mixture includes a fourth-stage oil-water mixture 4e and a fifth-stage oil-water mixture 5e. The aqueous phase separators include a fourth-stage aqueous phase separator 4f and a fifth-stage aqueous phase separator 5f. The fifth-stage oil phase separator 5c is crude shrimp oil.
[0060] For specific implementation details of step 104, please refer to [link / reference]. Figure 4 and Figure 5 As shown, it includes:
[0061] Step 104-1: The first centrifuge 41 separates the three-stage liquid phase separator 3b to obtain the four-stage solid phase separator 4a at the bottom, the four-stage oil-water mixture 4e at the middle, the four-stage oil phase separator 4c at the top, and the four-stage water phase separator 4f at the bottom.
[0062] The first centrifuge 41 is a first disc centrifuge with a centrifugal speed of 5000-6000 r / m and a single separation time of 1-2 min. After oil and water separation, the bottom layer of the fourth-stage solid phase separation 4a is fed into the twin-screw extruder 2 for recovery. The middle layer of the fourth-stage oil-water mixture 4e is sent to the drying and pulverizing equipment 6 for drying and pulverizing, and then used as one of the components of shrimp powder. The upper layer of the fourth-stage oil phase separation 4c enters the second centrifuge 42 for further separation. The lower layer of the fourth-stage aqueous phase separation 4f is sent to the recovery tank 5 for storage or extraction of water-soluble proteins.
[0063] Step 104-2: The second centrifuge 42 separates the fourth-stage oil phase 4c to obtain the fifth-stage oil phase 5c located in the upper layer, the fifth-stage oil-water mixture 5e located in the lower layer, and the fifth-stage aqueous phase 5f located in the lower layer.
[0064] The second centrifuge 42 is a second disc centrifuge, with a centrifugation speed of 10000-12000 r / m and a single separation time of 2-3 min. After oil-water separation, the upper five-stage oil phase separator 5c is collected as crude shrimp oil, sealed, and stored at low temperature for use in land-based shrimp oil refining; the lower five-stage oil-water mixture 5e is sent to the drying and pulverizing equipment 6, where it is dried and pulverized to become a component of shrimp powder; the lower five-stage aqueous phase separator 5f is sent to the recovery tank 5 for storage or extraction of water-soluble proteins.
[0065] Centrifuge assembly 4 separates the third-stage liquid phase product 3b to obtain the fourth-stage solid phase product 4a. The fourth-stage solid phase product 4a is fed to the twin-screw extruder 2 to form a second-stage recovery. Centrifuge assembly 4 separates the third-stage liquid phase product 3b to obtain an oil-water mixture. The oil-water mixture is fed to the drying and pulverizing equipment 6 to produce the target shrimp powder, forming a third-stage recovery.
[0066] After primary recovery, the centrifuge assembly 4 performs multiple separations on the tertiary liquid phase separator 3b. The resulting fifth-stage oil phase separator 5c, processed by the first centrifuge 41 and the second centrifuge 42, is used as crude shrimp oil. Compared to conventional disc centrifugation directly obtaining crude shrimp oil, the crude shrimp oil produced in this application has lower moisture content, improving its quality and shelf life. Furthermore, the multi-stage recovery process increases the shrimp meal yield, balancing the performance differences of the centrifuges and reducing the performance requirements of the centrifuge equipment, thus broadening the application prospects of this application. Experimental calculations show that it can increase the shrimp meal yield by more than 5% and reduce the protein and lipid content in the discharged water, mitigating environmental pollution.
[0067] Step 105: The aqueous phase separation material is collected in the recycling tank and processed according to the control instructions from the user.
[0068] Specifically, the implementation of step 105 refers to... Figure 5 and Figure 6 As shown, it includes:
[0069] Step 105-1: Obtain control commands from the user. There are two types of control commands: one indicating that the generated shrimp powder is for feed processing, and the other indicating that the generated shrimp powder is for shrimp oil extraction. These control commands can be pre-entered or entered by on-site staff. After a period without receiving a control command, the command is reset to a default value, which is pre-set to avoid constant monitoring by staff.
[0070] Step 105-2: When the control command instructs that shrimp meal be used for feed processing, a protein flocculant is added to the recovery tank 5 to flocculate the aqueous phase separation, obtaining protein recovery and water. The water is discharged, and the protein recovery is dried and pulverized in the drying and pulverizing equipment 6 to become one of the components of shrimp meal. The recovery tank 5 can be a flocculation tank.
[0071] Step 105-3: When the control command instructs the shrimp powder to be used for shrimp oil extraction, the recovery tank 5 stores the aqueous phase separation, or the recovery tank 5 adds a protein flocculant to the aqueous phase separation to flocculate the protein separation and obtain protein recovery, and stores the protein recovery.
[0072] Protein flocculant is added to recovery tank 5 to selectively recover the flocculated water-soluble protein (also known as protein recoverable). If this batch of Antarctic krill meal is used for feed processing, the protein recoverable is recovered and fed into drying and pulverizing equipment 6. After drying and pulverizing, it becomes one of the components of the krill meal. If this batch of krill meal is mainly used for subsequent krill oil extraction, the protein recoverable is not recovered. Recovery tank 5 stores the protein recoverable for addition during the processing of the next batch of feed krill meal.
[0073] Recovery tank 5 can also be used to add protein flocculants when Antarctic krill meal is used for feed processing. The flocculated water-soluble proteins (also known as protein recoveries) are extracted and then fed into drying and pulverizing equipment 6. After drying and pulverizing, these recoveries become a component of the krill meal. When the krill meal is mainly used for subsequent krill oil extraction, the aqueous phase is directly stored without flocculation until the next time the Antarctic krill meal is used for feed processing, at which point protein flocculants are added for flocculation. Wastewater from protein recovery is discharged directly.
[0074] When the control command instructs the shrimp powder to be used for feed processing, the recovery tank 5 performs flocculation treatment on the aqueous phase to obtain protein recovery material, which is then fed to the drying and pulverizing equipment 6 to generate the target shrimp powder, forming a four-stage recovery process.
[0075] Step 106: The drying and pulverizing equipment dries and pulverizes the secondary solid phase separator and the oil-water mixture to obtain the target shrimp powder.
[0076] Specifically, refer to Figure 5 As shown, the drying and pulverizing equipment 6 includes a drying device 61 and a pulverizing device 62. (Reference) Figure 7As shown, the drying equipment 61 has two drying inlets and one drying outlet. The two drying inlets are a front-stage drying inlet and a mid-to-rear-stage recovery inlet, respectively. The front-stage drying inlet is connected to the outlet of the twin-screw extruder 2 to receive the secondary solid phase separation material, and is also used to connect to the outlet of the recovery tank to receive the protein recovery material. The protein recovery material is dehydrated by a three-legged centrifuge and then transported to the front-stage drying inlet, reducing the drying load and improving the drying efficiency.
[0077] The intermediate and rear-stage recovery inlet is connected to the outlet of the first centrifuge 41 to receive the fourth-stage oil-water mixture 4e, and also to the outlet of the second centrifuge 42 to receive the fifth-stage oil-water mixture 5e. The oil-water mixture includes the fourth-stage oil-water mixture 4e and the fifth-stage oil-water mixture 5e. The oil-water mixture is pumped to the intermediate and rear-stage recovery inlet. When the moisture content of the material in the drying equipment 61 is 40-50%, the pump uses intermittent spraying to prevent agglomeration.
[0078] The crushing device 62 is connected to the discharge port of the drying device 61 and is used to crush the dried material to produce shrimp powder.
[0079] The steps described above are only for clarity. In practice, they can be combined into one step or some steps can be broken down into multiple steps. As long as they involve the same logical relationship, they are all within the scope of protection of this patent. Adding insignificant modifications or introducing insignificant designs to the algorithm or process, as long as they do not change the core design of the algorithm and process, are also within the scope of protection of this patent.
[0080] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A multi-stage separation and recovery method for processing Antarctic krill powder, characterized in that, The method includes the following steps: The drum screen equipment separates the cooked Antarctic krill material to obtain primary solid phase and primary liquid phase separation. The twin-screw extruder extrudes the first-stage solid phase separator, the third-stage solid phase separator, and the fourth-stage solid phase separator to obtain the second-stage solid phase separator and the second-stage liquid phase separator; A three-stage separation device separates the primary liquid phase product and the secondary liquid phase product to obtain the tertiary solid phase product, the tertiary liquid phase product, and the tertiary oil phase product; The centrifuge assembly repeatedly separates the three-stage liquid phase fraction to obtain the four-stage solid phase fraction, crude shrimp oil, oil-water mixture, and aqueous phase fraction. The recovery tank collects the aqueous phase separation material and processes it according to control commands from the user. The drying and pulverizing equipment dries and pulverizes the secondary solid phase separator and the oil-water mixture to obtain the target shrimp powder.
2. The method according to claim 1, characterized in that, The drum rotation speed of the drum screen is 20-40 r / min, and the screen mesh size is 0.2-0.6 mm; the three-stage separation equipment is a horizontal screw centrifuge with a centrifugal rotation speed of 3000-3500 r / min and a single separation working time of 2-3 min.
3. The method according to claim 1, characterized in that, The centrifuge assembly repeatedly separates the three-stage liquid phase fraction to obtain the four-stage solid phase fraction, oil-water mixture, and aqueous phase fraction, including: The first centrifuge separates the three-stage liquid phase separators to obtain the fourth-stage solid phase separator at the bottom, the fourth-stage oil-water mixture at the middle, the fourth-stage oil phase separator at the top, and the fourth-stage aqueous phase separator at the bottom. The second centrifuge separates the four-stage oil phase fraction to obtain a five-stage oil phase fraction in the upper layer, a five-stage oil-water mixture in the lower layer, and a five-stage aqueous phase fraction in the lower layer. The oil-water mixture includes the fourth-stage oil-water mixture and the fifth-stage oil-water mixture, the aqueous phase separator includes the fourth-stage aqueous phase separator and the fifth-stage aqueous phase separator, and the fifth-stage oil phase separator is the crude shrimp oil.
4. The method according to claim 3, characterized in that, The first centrifugation device is a first disc centrifuge, the centrifugation speed of the first disc centrifuge is 5000-6000 r / m, and the working time of a single separation is 1-2 min; the second centrifugation device is a second disc centrifuge, the centrifugation speed of the second disc centrifuge is 10000-12000 r / m, and the working time of a single separation is 2-3 min.
5. The method according to claim 1, characterized in that, The recovery tank collects the aqueous phase separation material and processes it according to control commands from the user, including: When the control command instructs the shrimp powder to be used for feed processing, a protein flocculant is added to the recovery tank to flocculate the aqueous phase separator to obtain protein recovery and water. The water is discharged, and the protein recovery is dried and pulverized by a drying and pulverizing equipment to be used as one of the components of shrimp powder. When the control command instructs the shrimp powder to be used for shrimp oil extraction, the recovery tank stores the aqueous phase separator.
6. The method according to claim 1, characterized in that, The twin-screw extrusion equipment has an extrusion feed port and an extrusion discharge port. The extrusion feed port is used to receive the primary solid phase separator, the tertiary solid phase separator, and the quaternary solid phase separator. The extrusion discharge port is used to output the secondary solid phase separator and the secondary liquid phase separator.
7. The method according to claim 6, characterized in that, The solid discharge port of the rotary screen equipment is connected to the feed port of the twin-screw extruder, and the third-stage and fourth-stage solid phase separators are transported to the feed port of the twin-screw extruder via a screw pump.
8. The method according to claim 5, characterized in that, The drying and pulverizing equipment includes a drying device and a pulverizing device. The drying device has two drying inlets and one drying outlet. The two drying inlets are a front drying inlet and a middle and rear recovery inlet, respectively. The front drying inlet is used to receive the secondary solid phase separation product and the protein recovery product, and the middle and rear recovery inlet is used to receive the oil-water mixture.
9. The method according to claim 8, characterized in that, The oil-water mixture is pumped to the middle and rear section recovery inlet, where a spray head is installed. When the moisture content of the material in the drying equipment is 40-50%, it is sprayed into the drying equipment in an intermittent spraying manner.
10. The method according to claim 8, characterized in that, The protein recovery material is dehydrated by a three-legged centrifuge and then transported to the front-end drying inlet.