A method for controlling the ratio of krill to water in an Antarctic krill homogenization tank

Abstract

The present invention discloses a method for controlling the shrimp-water ratio of an Antarctic krill homogenizing tank. The Antarctic krill homogenizing tank includes a homogenizing tank body, and the homogenizing tank body is connected to a seawater supply system, a quantitative weighing and conveying system, and a shrimp water output system for outputting a shrimp-water mixture: during operation, the shrimp water output system outputs the shrimp-water mixture according to a predetermined flow rate, and performs at least one liquid level control each time the liquid level in the homogenizing tank body reaches the lower limit of the liquid level, and stops the liquid level control when the liquid level reaches the upper limit of the liquid level; during the liquid level control process, the quantitative weighing and conveying system and the seawater supply system respectively input Antarctic krill and a corresponding proportion of seawater into the homogenizing tank body until the control process ends or the upper limit of the liquid level is reached. The above method can make the shrimp-water ratio of the shrimp-water mixture more stable and reliable. After each time the liquid level of the homogenizing tank body drops to the lower limit of the liquid level, multiple liquid level control processes are used to perform step-by-step acceleration control, so that the liquid level in the homogenizing tank body can be quickly restored.

Description

Technical Field

[0001] The invention relates to the field of aquatic products, and in particular to a method for controlling the ratio of krill to water in an Antarctic krill homogenization tank. Background Art

[0002] The homogenization tank is one of the core equipment in the Antarctic krill shelling production line. Antarctic krill and seawater form a uniform shrimp-water mixture (referred to as shrimp-water ratio) in a certain proportion in the homogenization tank, which is then transported to subsequent equipment to complete the shelling process. Some existing Antarctic krill homogenization tanks lack a shrimp-water ratio control mechanism, while some use an accurate measurement method of overall weighing of the homogenization tank and use density measurement to infer shrimp-water ratio parameters. However, due to the problems of offshore swinging liquid level fluctuations and differences in Antarctic krill density, the shrimp-water ratio has certain problems in terms of reliability and stability. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, the present invention provides a method for controlling the shrimp-water ratio of an Antarctic krill homogenization tank, which realizes the shrimp-water ratio of the homogenization tank through dynamic monitoring, dynamic adjustment and intelligent control.

[0004] The present invention provides a method for controlling the ratio of shrimp and water in an Antarctic krill homogenizing tank, wherein the Antarctic krill homogenizing tank comprises a homogenizing tank body, the homogenizing tank body is connected with a seawater supply system for inputting seawater, a quantitative weighing and conveying system for inputting Antarctic krill, and a shrimp water output system for outputting a shrimp and water mixture, and the method is characterized in that:

[0005] During operation, the shrimp water output system outputs the shrimp water mixture at a predetermined flow rate, performs at least one level control each time the liquid level in the homogenizing tank reaches the lower limit, and stops the level control when the liquid level reaches the upper limit; during the level control process, the quantitative weighing and conveying system and the seawater supply system respectively input Antarctic krill and a corresponding proportion of seawater into the homogenizing tank;

[0006] The mass rate KM of Antarctic krill in the quantitative weighing and conveying system during each liquid level control process c for:

[0007]

[0008] Among them, KM ini is the initial value of the mass rate of Antarctic krill; i is the number of liquid level regulation;

[0009] The control flow rate F of seawater delivered by the seawater supply system during each liquid level control process c for:

[0010] F c =60·X·KM c

[0011] Among them, X is the mass ratio, which refers to the ratio of the mass of Antarctic krill to the mass of seawater in the shrimp-water mixture;

[0012] The estimated control time for each liquid level control is t i for:

[0013]

[0014] Among them: α2 is the control coefficient; FL max Is the upper limit of the liquid level; FL min is the lower limit of the liquid level; S is the bottom area of ​​the homogenizing tank; ρ kri is the density of Antarctic krill; ρ sw is the density of seawater;

[0015] If the duration of liquid level control reaches the corresponding control estimated time t i If the liquid level in the rear homogenizing tank does not reach the upper limit of the liquid level, the next liquid level regulation will be carried out.

[0016] A further improvement of the present invention is that each control parameter in the startup state satisfies the following relationship:

[0017]

[0018] Among them, F ini is the initial flow rate of seawater delivered by the seawater supply system, α1 is the initial coefficient, α1 value is 1.02, and the initial value of the mass rate of Antarctic krill KM ini Set to 15-20Kg / min, α0 is 10, initial control time t 10 =120s.

[0019] A further improvement of the present invention is that during operation, the flow rate KF of the shrimp water mixture output by the shrimp water output system is c for:

[0020] KF c =0.55·F ini

[0021] Among them: F ini The initial flow rate of seawater delivered to the seawater supply system.

[0022] The device provided by the present invention has the following technical effects: the shrimp-water ratio of the shrimp-water mixture can be made more stable and reliable by adopting the above method. Each time the liquid level of the homogenizing tank drops to the lower limit of the liquid level, multiple liquid level control processes are used to perform gradual acceleration control, so that the liquid level in the homogenizing tank can be quickly restored. Each time the liquid level drops to the lower limit of the liquid level, the acceleration control processes are independent of each other, avoiding the cumulative error of the previous control, and ensuring the stability and reliability of the control process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the Antarctic krill homogenization tank. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0025] The embodiment of the present invention provides a method for controlling the krill-water ratio in an Antarctic krill homogenization tank, and the method is used to control the Antarctic krill homogenization tank. Figure 1 As shown, the Antarctic krill homogenization tank comprises a homogenization tank body 1. The homogenization tank body 1 is connected with a seawater supply system 4 for inputting seawater, a quantitative weighing and conveying system 5 for inputting Antarctic krill, and a shrimp water output system 6 for outputting a shrimp water mixture.

[0026] In this embodiment, the structure of the homogenizing tank body 1 is a rectangular parallelepiped with a flat bottom and the areas of each cross section are the same. The quantitative weighing and conveying system 5 can obtain the real-time dynamic mass rate of Antarctic krill with an accuracy of ±5g / s. The seawater supply system 4 uses a constant pressure variable flow method to transport seawater, and the flow rate of the supplied seawater can be adjusted according to process requirements. The shrimp water output system 6 also uses a constant pressure variable flow method to transport the mixture of Antarctic krill and seawater (referred to as: shrimp water mixture), and sets the shrimp water ratio parameters according to the process. The quantitative weighing and conveying system can transport Antarctic krill in real time and dynamically according to the mass rate parameters, the shrimp water output system 6 can output the shrimp water mixture in real time and dynamically according to the flow setting, and the seawater supply system 4 can input seawater in real time and dynamically according to the flow setting.

[0027] A homogenizer 2 is provided in the homogenizing tank 1 to stir the shrimp-water mixture in the homogenizing tank 1 during operation. The homogenizer 2 is driven by a homogenizer motor 3. The homogenizer 2 and the homogenizer motor 3 are mainly used to ensure that the seawater and Antarctic krill in the homogenizing tank 1 are evenly mixed. A liquid level sensor is provided inside the homogenizing tank 1 to measure the liquid level in real time.

[0028] The shrimp-water ratio in the homogenizing tank during the Antarctic krill shelling process is a key factor affecting quality and production stability. In the specific implementation process, the method of the present invention includes a startup state and an operation state. Specifically:

[0029] Startup state: When the homogenization tank system starts working, first set the shrimp-water mass ratio X, and then determine whether to enter the startup state. If it enters the startup state, calculate the initial control parameters (the meaning of each control parameter is shown in Table-1), set the control parameters for the given amount weighing and conveying system, set the relevant control parameters for the seawater supply system, and complete the initial delivery of Antarctic krill and seawater according to the set parameters and control time. The homogenizer motor drives the homogenizer to stir at a constant speed to ensure that the seawater and Antarctic krill in the homogenizer tank are evenly mixed.

[0030]

[0031] Among them, F ini is the initial flow rate of seawater delivered by the seawater supply system, α1 is the initial coefficient, α1 value is 1.02, and the initial value of the mass rate of Antarctic krill KM ini Set to 15-20Kg / min, α0 is 10, initial control time t 10 =120s. Initial control time t 10 After completion, the system enters normal operation state.

[0032] Table-1 Variable parameters mainly involved in this embodiment

[0033]

[0034] When the startup state is completed, the liquid level sensor in the homogenizing tank 1 monitors the liquid level parameters and starts the shrimp water output system 6, so that the shrimp water output system 6 outputs the shrimp water mixture according to the predetermined flow rate. Whenever the liquid level in the homogenizing tank 1 reaches the lower limit of the liquid level, the liquid level control is performed at least once, and the liquid level control is stopped when the liquid level reaches the upper limit of the liquid level. During the liquid level control process, the quantitative weighing and conveying system 5 and the seawater supply system 4 respectively input Antarctic krill and the corresponding proportion of seawater into the homogenizing tank 1.

[0035] The mass rate KM of Antarctic krill in the quantitative weighing and conveying system 5 during each liquid level control process c for:

[0036]

[0037] Among them, KM ini is the initial value of the mass rate of Antarctic krill; i is the number of liquid level controls; the number of liquid level controls i starts from 1;

[0038] During each liquid level control process, the seawater supply system 4 delivers seawater at a controlled flow rate F c for:

[0039] F c =60·X·KM c

[0040] Among them, X is the mass ratio, which refers to the ratio of the mass of Antarctic krill to the mass of seawater in the shrimp-water mixture;

[0041] The estimated control time for each liquid level control is t i for:

[0042]

[0043] Among them: α2 is the control coefficient, its value is 0.55; FL max Is the upper limit of the liquid level; FL min is the lower limit of the liquid level; S is the bottom area of ​​the homogenizing tank 1; ρ kri is the density of Antarctic krill; ρ sw is the density of seawater;

[0044] If the duration of liquid level control reaches the corresponding control estimated time t i If the liquid level in the rear homogenizing tank 1 does not reach the upper limit of the liquid level, the next liquid level control is immediately performed (the number of liquid level controls i is increased by one), until the liquid level in the homogenizing tank 1 reaches the upper limit of the liquid level, and the ongoing liquid level control is immediately stopped (the number of liquid level controls i is set to one).

[0045] In this embodiment, during operation, the shrimp water output system 6 outputs the flow rate KF of the shrimp water mixture. c for:

[0046] KF c =0.55·F ini

[0047] Among them: F ini The initial flow rate of seawater delivered to the seawater supply system.

[0048] The above method can make the shrimp-water ratio of the shrimp-water mixture more stable and reliable. Each time the liquid level of the homogenizing tank drops to the lower limit of the liquid level, multiple liquid level control processes are used to gradually accelerate the control, so that the liquid level in the homogenizing tank can be quickly restored. Each time the liquid level drops to the lower limit of the liquid level, the acceleration control processes are independent of each other, avoiding the cumulative error of the previous control and ensuring the stability and reliability of the control process.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for controlling the ratio of shrimp to water in an Antarctic krill homogenizing tank, the Antarctic krill homogenizing tank comprising a homogenizing tank body, the homogenizing tank body being connected to a seawater supply system for inputting seawater, a quantitative weighing and conveying system for inputting Antarctic krill, and a shrimp water output system for outputting a shrimp-water mixture, characterized in that: During operation, the shrimp water output system outputs the shrimp water mixture at a predetermined flow rate, performs at least one level control each time the liquid level in the homogenizing tank reaches the lower limit, and stops the level control when the liquid level reaches the upper limit; during the level control process, the quantitative weighing and conveying system and the seawater supply system respectively input Antarctic krill and a corresponding proportion of seawater into the homogenizing tank; The mass rate KM of Antarctic krill in the quantitative weighing and conveying system during each liquid level control process c for: Among them, KM ini is the initial value of the mass rate of Antarctic krill; i is the number of liquid level regulation; The control flow rate F of seawater delivered by the seawater supply system during each liquid level control process c for: F c =60·X·KM c Among them, X is the mass ratio, which refers to the ratio of the mass of Antarctic krill to the mass of seawater in the shrimp-water mixture; The estimated control time for each liquid level control is t i for: Among them: α2 is the control coefficient; FL max Is the upper limit of the liquid level; FL min is the lower limit of the liquid level; S is the bottom area of ​​the homogenizing tank; ρ kri is the density of Antarctic krill; ρ sw is the density of seawater; If the duration of liquid level control reaches the corresponding control estimated time t i If the liquid level in the rear homogenizing tank does not reach the upper limit of the liquid level, the next liquid level regulation will be carried out.

2. The method for controlling the ratio of krill to water in an Antarctic krill homogenization tank according to claim 1, characterized in that: In the startup state, each control parameter satisfies the following relationship: Among them, F ini is the initial flow rate of seawater delivered by the seawater supply system, α1 is the initial coefficient, α1 value is 1.02, and the initial value of the mass rate of Antarctic krill KM ini Set to 15-20Kg / min, α0 is 10, initial control time t 10 =120s.

3. The method for controlling the ratio of krill to water in a homogenizing tank of Antarctic krill according to claim 1, characterized in that: During operation, the flow rate KF of the shrimp water mixture output by the shrimp water output system c for: KF c =0.55·F ini Among them: F ini The initial flow rate of seawater delivered to the seawater supply system.

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