Device and method for raising seabed nutrients in shellfish raft culture area

Abstract

The present invention discloses a device and method for lifting seabed nutrients in a shellfish raft culture area. The shellfish raft includes a raft and a limit cable connected between the seabed and the raft. The device for lifting seabed nutrients in a shellfish raft culture area includes a raft arranged on the seabed, a plurality of groups of jet pipes are fixedly arranged on the raft, and a plurality of jet nozzles are opened on each group of jet pipes. The jet pipes are connected with an air duct, and an upper pressurizing mechanism and a lower pressurizing mechanism are connected to the air duct. The present invention uses the upper pressurizing mechanism and the lower pressurizing mechanism to provide power for the air duct to introduce gas above the sea surface into the seabed, forming an air curtain, so that an upwelling is generated in the raft culture area, thereby lifting the bottom water with a high nutrient salt content to the surface layer, providing bait microalgae for growth, improving the abundance of bait microalgae in the culture area, improving the primary productivity of the raft area, and thus improving the survival rate and yield of raft cultured shellfish. At the same time, it can increase the dissolved oxygen in the surface water, thereby playing a role in optimizing the seawater environment in the culture area.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of shellfish culture equipment, and can be widely used to lift bottom seawater to the surface to increase the nutrient salt of the surface water. Here, it particularly relates to a device and method for lifting seabed nutrient salt in a shellfish floating raft culture area. Background Art

[0002] Appropriate development of shallow sea shellfish farming can not only provide humans with a large amount of high-quality seafood, but also effectively control marine eutrophication and prevent the occurrence of red tides. It has significant ecological and environmental benefits and is a win-win human production activity. At present, the main methods of shellfish farming include bottom seeding, pole farming, longline farming, fixed frame farming and raft farming. With the development of offshore raft farming, the scale of shallow sea raft shellfish farming in my country has continued to expand, and a large area of ​​raft farming has appeared on the sea surface. The spatial layout of the entire raft has had a certain impact on the hydrodynamic exchange performance of the water body in the farming area, changing the hydrodynamic characteristics of the farming area and the adjacent sea area. At the same time, it also weakened the material transport and diffusion capacity of the sea area.

[0003] Shellfish bait includes natural zooplankton, unicellular algae, etc. The traditional breeding method uses natural zooplankton and unicellular algae in seawater as basic bait, but this method can no longer meet the normal growth needs of shellfish. In recent years, shellfish breeding has shown that the growth of shellfish on the outermost sides of the raft area is good, while the growth of shellfish in the middle raft area is poor, and even stagnation or large-scale death has occurred; the research team found that the main external cause of the large-scale death of raft-cultured shellfish is the lack of bait and "starvation". The reason is that the hydrodynamic conditions in the breeding area are limited by the raft body, which hinders the smoothness of nutrient and bait transportation, resulting in a lack of organic matter and nutrients required for the growth and reproduction of marine microalgae and natural zooplankton in seawater. The shellfish have low feeding capacity, resulting in large-scale death of raft-cultured shellfish; while organic matter and nutrients are often on the seabed. Due to the influence of thermocline and halocline in deep waters, it is difficult for seabed nutrients to be transported to the euphotic layer of the sea surface, resulting in insufficient feed for marine microalgae and natural zooplankton in seawater. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for lifting seabed nutrients in a shellfish floating raft culture area to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The invention provides a device for lifting seabed nutrients in a shellfish floating raft culture area. The shellfish floating raft comprises a floating raft and a limiting cable connected between the seabed and the floating raft. The limiting cable is connected to the seabed through a fixed anchor.

[0007] The device for lifting seabed nutrients in a shellfish raft culture area comprises a raft arranged on the seabed, on which a plurality of groups of injection pipes are fixedly arranged, and each group of the injection pipes is provided with a plurality of nozzles; the injection pipes are connected to an air duct, one end of the air duct passes through the raft and extends out of the sea surface, and the air duct is connected to an upper pressurizing mechanism and a lower pressurizing mechanism.

[0008] Preferably, a plurality of groups of anchor ropes are provided between the floating raft and the bottom raft, a breeding cage is fixedly connected to each group of the anchor ropes, the nozzle of the injection pipe sprays vertically upward, and the nozzle is arranged between adjacent breeding cages.

[0009] Preferably, the floating raft includes an upper raft body and a lower raft body distributed up and down, and the upper raft body and the lower raft body are respectively arranged on the upper and lower sides of the sea surface, the lower raft body is fixedly connected to a plurality of groups of stem ropes, each group of the stem ropes is fixedly connected to a buoy, and the buoy floats between the upper raft body and the sea surface.

[0010] Preferably, an isolation tube is sleeved on the outer side of the air duct, one end of the isolation tube is fixedly connected to the bottom raft, and the other end of the isolation tube passes through the upper raft body and the lower raft body and protrudes out of the sea surface, and the side of the isolation tube protruding out of the sea surface is fixedly connected to a limiting plate.

[0011] Preferably, the upper pressurizing mechanism comprises an air pump, and the air pump is connected to an energy supply mechanism.

[0012] Preferably, the energy supply mechanism includes several groups of solar panels, the several groups of solar panels are electrically connected to energy storage batteries, the air pump and the energy storage battery are electrically connected, and a sealed shell is provided on the outside of the air pump and the energy storage battery.

[0013] Preferably, the raft comprises a raft body, a plurality of groups of fixing cables are fixedly connected to the bottom of the raft body, and the fixing cables are fixedly connected to the rafts.

[0014] Preferably, the lower boost mechanism includes a sealed boost box, in which an air boost pump is fixedly installed, the air inlet end of the air boost pump is connected to the air duct, the air outlet end of the air boost pump is connected to the injection pipe, and the air boost pump is driven by a drive shaft, and a turbine blade is fixedly connected to the drive shaft.

[0015] A method for increasing seabed nutrients in a shellfish raft culture area comprises the following steps:

[0016] S1. Install the floating raft and the raft, fix the floating raft by limiting cables and anchors, and place the raft on the seabed;

[0017] S2. Install an air duct, one end of the air duct is connected to the injection pipe, the other end of the air duct extends out of the sea, and the upper and lower pressurizing mechanisms are installed on the installation air duct, and the water inside the injection pipe is emptied;

[0018] S3. The upper and lower boost mechanisms work, transporting the gas to the jet pipe through the air duct and discharging it through the nozzle to form an air curtain to guide the gas to the sea surface, which drives the seabed water to rise.

[0019] Preferably, in S3, the electricity generated by the solar panel is stored in an energy storage battery, and the energy storage battery provides electricity for the air pump; the water flow on the seabed drives the turbine blades to rotate, and the spiral blades drive the drive shaft to rotate, thereby driving the air booster pump to work and realize secondary pressurization of the gas.

[0020] The present invention discloses the following technical effects: the present invention adopts the artificial intervention mode, utilizes the upper boost mechanism and the lower boost mechanism to provide power for the air duct to introduce the gas above the sea surface into the seabed, and ejects the gas through the ejection pipe and the nozzle opened above it to form an air curtain, and according to the Bernoulli energy conservation equation of water body and the principle of air curtain method, the raft culture area generates upwelling, and the seabed nutrients and other substances required for the growth of microalgae required by the economic organisms in the culture area are transported upward along with the air curtain, and the dissolved oxygen in the surface water is increased to a great extent, the water quality is improved, and the abundance of bait microalgae in the culture area is increased, thereby improving the survival rate and yield of raft cultured shellfish, and starting from reducing the culture cost, the effective utilization rate of seabed nutrients is improved, and then the biological yield is increased, and the economic benefits of farmers and enterprises are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the device for lifting nutrients from the seabed in the shellfish raft culture area according to the present invention;

[0023] Figure 2 It is a schematic diagram of the air curtain structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the injection pipe of the present invention;

[0025] Figure 4 It is a schematic diagram of the nozzle structure of the present invention;

[0026] Among them, 1 is a floating raft, 2 is a limiting cable, 3 is a fixed anchor, 4 is a bottom raft, 5 is a jet pipe, 6 is a nozzle, 61 is a jet hole, 7 is an air duct, 8 is an anchor rope, 9 is a breeding cage, 10 is an upper raft body, 11 is a lower raft body, 12 is a stem rope, 13 is a float, 14 is an isolation tube, 15 is a limiting plate, 16 is an air pump, 17 is a solar panel, 18 is a bottom raft body, 19 is a fixed cable, 20 is breeding, 21 is a sealed booster box, 22 is an air booster pump, 23 is a drive shaft, and 24 is a turbine blade. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Figure 1-4 The present invention provides a device for lifting seabed nutrients in a shellfish raft cultivation area. The shellfish raft comprises a raft 1, a limiting cable 2 connected between the seabed and the raft 1, and the limiting cable 2 is connected to the seabed through a fixed anchor 3; the raft 1 comprises an upper raft body 10 and a lower raft body 11 which are fixedly connected and distributed up and down, and the upper raft body 10 and the lower raft body 11 are respectively arranged on the upper and lower sides of the sea surface, and the lower raft body 11 is fixedly connected with a plurality of groups of stem ropes 12, and each group of stem ropes 12 is fixedly connected with a buoy 13, and the buoy 13 floats between the upper raft body 10 and the sea surface, and buoyancy is provided for the entire shellfish raft and the device for lifting seabed nutrients in a shellfish raft cultivation area through the plurality of groups of buoys 13, and the raft 1 is connected to the seabed through the limiting cable 2 and the fixed anchor 3, so as to limit the position of the shellfish raft including the raft 1 and prevent it from drifting away with the waves.

[0030] The device for lifting seabed nutrients in a shellfish raft culture area comprises a raft 4 arranged on the seabed, a plurality of groups of injection pipes 5 are fixedly arranged on the raft 4, a plurality of nozzles 6 are opened on each group of injection pipes 5, and the nozzles 6 comprise two groups of concentrically arranged annular nozzles, a plurality of air pipes are connected between the two groups of annular nozzles, and a plurality of injection holes 61 are opened on the two groups of annular nozzles and the air pipes, so that the nozzles 6 form columnar plumes; the injection pipes 5 are connected with an air duct 7, one end of the air duct 7 passes through the raft 1 and extends out of the sea surface, and the air duct 7 is connected with an upper pressurizing mechanism and a lower pressurizing mechanism.

[0031] At the same time, the floating raft 1 is a split structure, the upper raft body 10 is arranged above the sea surface, providing an installation position for the solar panels and related equipment, and preventing them from contacting with seawater; the lower raft body 11 is arranged below the sea surface, and a number of groups of anchor ropes 8 are arranged between the lower raft body 11 and the bottom raft 4, each group of anchor ropes 8 is fixedly connected to a breeding cage 9, and shellfish are cultured in the breeding cage 9, and the position of the breeding cage 9 is limited by the anchor rope 8. The nozzle 6 of the injection pipe 5 sprays vertically upward, and the nozzle 6 is arranged between adjacent breeding cages 9 to prevent the air curtain from blowing directly to the net cage and affecting the growth and life of shellfish. A one-way valve is arranged inside the nozzle 6 of the injection pipe 5 to prevent seawater from entering the nozzle 6 of the injection pipe 5.

[0032] The raft 4 includes a raft body 18, and a plurality of fixed cables 19 are fixedly connected to the bottom of the raft body 18. The fixed cables 19 are fixedly connected to the rafts 20. The rafts 20 can prevent the raft 4 from drifting away with the waves, and can also isolate the raft body 18 from the seabed to prevent it from being buried by the materials in the seabed. The raft body 18, the upper raft body 10 and the lower raft body 11 are all existing technologies, and are all fixedly connected by steel pipes and other pipes, and will not be described in detail here.

[0033] An isolation tube 14 is sleeved on the outside of the air duct 7. One end of the isolation tube 14 is fixedly connected to the raft 4. The other end of the isolation tube 14 penetrates the upper raft body 10 and the lower raft body 11 and extends out of the sea surface. The side of the isolation tube 14 extending out of the sea surface is fixedly connected to a limit plate 15. The limit plate 15 prevents the isolation tube 14 from being separated from the floating raft 1 and the raft 4 under the action of waves and tides. At the same time, the isolation tube 14 is a flexible pipe that can be bent. The isolation tube 14 ensures that the air duct 7 inside it prevents or reduces the influence of seawater pressure on it, reduces the pressure required to be provided by the upper and lower boosting mechanisms, and reduces the energy consumption required for the upper and lower boosting mechanisms to work. At the same time, the end of the isolation tube 14 penetrates the upper raft body 10 and the lower raft body 11, which is a movable end. The isolation tube 14 can ensure that the air duct 7 is not affected by the outside world in the case of high and low tides, and no seawater will enter the isolation tube 14.

[0034] The upper boost mechanism includes an air pump 16, and the air pump 16 is connected to an energy supply mechanism. The energy supply mechanism includes several groups of solar panels 17, and the several groups of solar panels 17 are electrically connected to energy storage batteries. The air pump 16 and the energy storage batteries are electrically connected, and a sealed shell is provided on the outside of the air pump 16 and the energy storage batteries. The solar panel 17 generates electricity under the action of light and stores the electricity in the energy storage battery. The energy storage battery then provides electricity to the air pump 16 to ensure that it can work normally. The energy storage battery can store electricity to ensure that the air pump 16 can work normally in rainy weather and at night.

[0035] The lower boost mechanism includes a sealed boost box 21, in which an air boost pump 22 is fixedly arranged, the air inlet end of the air boost pump 22 is communicated with the air duct 7, the air outlet end of the air boost pump 22 is communicated with the injection pipe 5, and the air boost pump 22 is driven by a drive shaft 23, on which a turbine blade 24 is fixedly connected. The water on the seabed is fluid, and under the impact of seawater, the turbine blade 24 rotates to drive the drive shaft 23 to rotate, thereby making the air boost pump 22 work, and the gas inside the air duct 7 is secondary pressurized, reducing the pressure required by the air pump, reducing the power required by the air pump, and reducing energy consumption.

[0036] A method for increasing the nutrient salt on the seabed of a shellfish raft culture area comprises the following steps:

[0037] S1. Install the floating raft 1 and the raft 4, fix the floating raft 1 by the limit cable 2 and the anchor 3, and set the raft 4 on the seabed;

[0038] S2. Install the air duct 7, one end of the air duct 7 is connected to the injection pipe 5, the other end of the air duct 7 extends out of the sea, and the upper and lower pressurizing mechanisms are installed on the air duct 7, and the water inside the injection pipe 5 is emptied;

[0039] S3. The upper and lower boosting mechanisms work, transporting the gas to the jet pipe 5 through the air duct 7 and discharging it through the nozzle 6 to form an air curtain to guide the gas to the sea surface, and the air curtain drives the seabed water to rise. The electricity generated by the solar panel 17 is stored in the energy storage battery, and the energy storage battery provides electricity for the air pump 16; the water flow on the seabed drives the turbine blades 24 to rotate, and the spiral blades drive the drive shaft 23 to rotate, thereby driving the air booster pump 22 to work to achieve secondary gas boosting.

[0040] The main purpose of this device is to design a device in the floating raft aquaculture area that can transport nutrients from the seabed to the surface of the seawater for the growth of microalgae. There is basically upwelling of seawater in the fishing area. In the sea area with relatively strong upwelling flow, the aquaculture farms are basically built around the sea area with this characteristic water body. With the help of the dynamic trend of the water body itself, this device adopts a trend-following approach to generate upwelling in the sea area without upwelling and enhance the flow in the sea area with smaller upwelling. The present invention adopts the method of artificial intervention, and utilizes the upper pressurization mechanism and the lower pressurization mechanism to provide power for the air duct to introduce the gas above the sea surface into the seabed, and ejects the gas through the ejection pipe and the nozzle opened above it to form an air curtain, and according to the Bernoulli energy conservation equation of water body and the principle of the air curtain method, an upwelling is generated in the raft culture area, and the nutrients and other substances on the seabed are transported upward along the air curtain to supply the growth of bait microalgae, and the abundance of bait microalgae in the culture area is increased, thereby improving the survival rate and yield of raft cultured shellfish, and starting from reducing the culture cost, the effective utilization rate of seabed nutrients is improved, and then the biological yield is increased, and the economic benefits of farmers and enterprises are guaranteed.

[0041] The sample of the above device was demonstrated and applied in a scallop culture raft in Changhai County, Dalian City, Liaoning Province. The specific process is as follows:

[0042] First, the hydrodynamic distribution characteristics of the sea area are calculated using empirical formulas, model tests or numerical simulations, and then the spatial exchange performance of the water body is evaluated to determine the placement location scientifically and reasonably.

[0043] Secondly, the product of the present invention was deployed and observed in the breeding raft area, and its constitutive relationship was obtained through multiple experiments based on the least squares principle of multivariate first-order numerical approximation. That is:

[0044] F=F(A,h,U,W,S,d,n) (1)

[0045] In the formula, F represents power (the reading of the generator), A represents the area of ​​the raft, h represents the water depth, U represents the flow rate of the water body, W represents the power of the pump, S represents the biomass, and d and n represent the diameter and number of the air pores, respectively.

[0046] The experimental relationship data pairs obtained are (A1, h1, U1, W1, S1, d1, n1, F1), (A2, h2, U2, W2, S2, d2, n2, F2), (A3, h3, U3, W3, S3, d3, n3, F3), (A4, h4, U4, W4, S4, d4, n4, F4), (A5, h5, U5, W5, S5, d5, n5, F5), (A6, h6, U6, W6, S6, d6, n6, F6), (A7, h7, U7, W7, S7, d7, n7, F7);

[0047] Using the standard form of the least squares method, let:

[0048] F 计 =F(A,h,U,W,S,d,n)=a0+a1A+a2h+a3U+a4W+a5S+a6d+a7n (2)

[0049] The definition of using the minimum sum of squares of deviations as the basis for optimization is:

[0050] φ=∑(F i -F 计 )twenty three)

[0051] At this time, substitute equation (2) into equation (3).

[0052] When ∮=∑(F i -F 计)2 is the smallest, the partial derivatives of a0, a1, a2, a3, a4, a5, a6, and a7 can be calculated using the function ∮ to be equal to zero. Then, we get a system of eight linear equations about the eight unknowns a0, a1, a2, a3, a4, a5, a6, and a7. Solve these eight equations to get the values ​​of a0, a1, a2, ... a7.

[0053] Finally, a0, a1, a2, a3, a4, a5, a6, and a7 are all substituted into expression (2). At this time, equation (2) is the regression linear equation, specifically called the expression of the least squares method, which is also the mathematical model based on which the constitutive relationship formed by the present invention is based.

[0054] The body length, quantity and weight of scallops were recorded during the typical period of scallop farming, and compared with the growth information of the same period in the past. It was found that the technical solution of the present invention is indeed effective.

[0055] During the 10-month experimental period, the survival rate of one-year-old clams in the experimental area increased by 28% and the fresh weight increased by 18% compared with the control area. The survival rate of two-year-old clams in the experimental area increased by 16% and the fresh weight increased by 25% compared with the control area.

[0056] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for increasing the nutrient salts on the seabed of a shellfish raft culture area, characterized in that: The shellfish floating raft comprises a floating raft (1), a limiting cable (2) connected between the seabed and the floating raft (1), and the limiting cable (2) is connected to the seabed via a fixed anchor (3); The device for lifting seabed nutrients in a shellfish raft culture area comprises a raft (4) arranged on the seabed, a plurality of groups of injection pipes (5) are fixedly arranged on the raft (4), and a plurality of nozzles (6) are provided on each group of the injection pipes (5); a one-way valve is provided inside each group of the nozzles (6), and the nozzles (6) comprise two groups of concentrically arranged annular nozzles, and a plurality of air pipes are connected between the two groups of the annular nozzles, and a plurality of injection holes (61) are provided on the two groups of the annular nozzles and the air pipes; the injection pipes (5) are connected with an air conduit (7), one end of the air conduit (7) passes through the raft (1) and extends out of the sea surface, and the air conduit (7) is connected with an upper pressurizing mechanism and a lower pressurizing mechanism; The lower boost mechanism comprises a sealed boost box (21), an air boost pump (22) is fixedly arranged in the sealed boost box (21), an air inlet end of the air boost pump (22) is connected to an air duct (7), an air outlet end of the air boost pump (22) is connected to an injection pipe (5), and the air boost pump (22) is driven by a drive shaft (23), and a turbine blade (24) is fixedly connected to the drive shaft (23).

2. The device for lifting seabed nutrients in a shellfish raft culture area according to claim 1, characterized in that: A plurality of groups of anchor ropes (8) are arranged between the floating raft (1) and the bottom raft (4), and a breeding cage (9) is fixedly connected to each group of the anchor ropes (8). The nozzles (6) of the spray pipes (5) spray vertically upward, and the nozzles (6) are arranged between adjacent breeding cages (9).

3. The device for lifting seabed nutrients in shellfish raft culture areas according to claim 1, characterized in that: The floating raft (1) comprises an upper raft body (10) and a lower raft body (11) which are distributed up and down, and the upper raft body (10) and the lower raft body (11) are respectively arranged on the upper and lower sides of the sea surface, and the lower raft body (11) is fixedly connected to a plurality of groups of stem ropes (12), and each group of the stem ropes (12) is fixedly connected to a buoy (13), and the buoy (13) floats between the upper raft body (10) and the sea surface.

4. The device for lifting seabed nutrients in shellfish raft culture areas according to claim 3, characterized in that: An isolation tube (14) is sleeved on the outer side of the air duct (7), one end of the isolation tube (14) is fixedly connected to the bottom raft (4), and the other end of the isolation tube (14) passes through the upper raft body (10) and the lower raft body (11) and protrudes out of the sea surface. The side of the isolation tube (14) protruding out of the sea surface is fixedly connected to a limiting plate (15).

5. The device for lifting seabed nutrients in shellfish raft culture areas according to claim 1, characterized in that: The upper pressurizing mechanism comprises an air pump (16), and the air pump (16) is connected to an energy supply mechanism.

6. The device for lifting seabed nutrients in shellfish raft culture areas according to claim 5, characterized in that: The energy supply mechanism comprises a plurality of groups of solar panels (17), the plurality of groups of solar panels (17) are electrically connected to energy storage batteries, the air pump (16) is electrically connected to the energy storage batteries, and a sealed casing is disposed outside the air pump (16) and the energy storage batteries.

7. The device for lifting seabed nutrients in shellfish raft culture areas according to claim 1, characterized in that: The raft (4) comprises a raft body (18), a plurality of groups of fixing cables (19) are fixedly connected below the raft body (18), and the fixing cables (19) are fixedly connected to a mate (20).

8. A method for increasing the nutrient salts on the seabed of a shellfish raft aquaculture area, based on the device for increasing the nutrient salts on the seabed of a shellfish raft aquaculture area according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Installing the floating raft (1) and the raft (4), fixing the floating raft (1) by the limiting cable (2) and the fixed anchor (3), and setting the raft (4) on the seabed; S2. Install an air duct (7), one end of which is connected to the injection pipe (5), and the other end of which extends out of the sea surface, and install the upper and lower pressurizing mechanisms on the air duct (7), and drain the water inside the injection pipe (5); S3. The upper boost mechanism and the lower boost mechanism work, transporting the gas to the injection pipe (5) through the air duct (7) and discharging the gas through the nozzle (6) to form an air curtain to guide the gas to the sea surface, and the air curtain drives the seabed water to rise.

9. The device for lifting seabed nutrients in shellfish raft culture areas according to claim 1, characterized in that: In S3, the electricity generated by the solar panel (17) is stored in the energy storage battery, and the energy storage battery provides electrical energy for the air pump (16); the flow of water on the seabed drives the turbine blades (24) to rotate, and the spiral blades drive the drive shaft (23) to rotate, thereby driving the air booster pump (22) to work and realize secondary pressurization of the gas.

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