A multi-stage membrane regulation oxygen supply system for aquaculture

Abstract

The application discloses a kind of multistage membrane regulation oxygen supply systems of aquaculture, it is related to aquaculture oxygen supply technical field.The membrane separation unit, pressure reducer, heat exchanger, ball valve, flow control meter and stop valve are sequentially communicated, the stop valve is communicated with the microporous aeration pipe network of pond bottom by pipeline, and the multi-parameter water quality tester is placed in pond water body, and the controller is arranged outside the pond, and the multi-parameter water quality tester, membrane separation unit, ball valve and flow control meter are electrically connected with the controller, and the water quality parameters monitored by the multi-parameter water quality tester are transmitted to the controller, and the controller controls the membrane separation unit, ball valve and flow control meter to adjust the oxygen supply amount.The oxygen supply system provided by the application can realize controllable adjustment of pond oxygen supply amount, and the system has strong applicability, wide range of use, and solves the problem of high consumption and low efficiency of oxygen increasing equipment in the prior art, thereby promoting the healthy development of aquaculture industry.

Description

Technical Field

[0001] This invention relates to the field of oxygen supply technology for aquaculture, specifically to a multi-stage membrane regulation oxygen supply system for aquaculture. Background Technology

[0002] For aquaculture, fish, shrimp, and other organisms in ponds require a significant amount of oxygen, which is insufficient relying solely on the original oxygen content in the water. Various aeration devices are used to increase the oxygen content in the pond water, allowing aquatic organisms to grow normally. However, the oxygen requirement of organisms in a pond is not constant. Oxygen demand varies depending on different conditions. For example, when the ambient temperature is high, oxygen dissolution capacity decreases, and the metabolic activity of organisms accelerates, thus increasing oxygen demand. At night, aquatic plants in the pond no longer release oxygen through photosynthesis, but organisms still need to carry out metabolic activities, resulting in a higher oxygen demand than during the day. Other factors, such as stocking density, water quality, excessive organic waste, and accumulated pond sediment, also affect the oxygen demand of the pond. Therefore, it is essential to adjust the aeration level according to the specific conditions of the aquaculture farm to ensure a sufficient oxygen supply in the water.

[0003] Currently, most ponds on the market use mechanical aeration, which suffers from high energy consumption, uneven oxygen supply, and oxygen overload. Secondly, physical and chemical aeration methods are also widely used in aquaculture. While these methods effectively provide oxygen to the aquaculture water, they struggle to achieve large-scale, variable-range adjustments to the pond's oxygen supply in response to different influencing factors. Therefore, there is an urgent need to design a pond oxygenation system that allows for controllable adjustment of the pond's oxygen supply. Summary of the Invention

[0004] The main objective of this invention is to provide a multi-stage membrane regulation oxygen supply system for aquaculture, in order to solve the technical problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A multi-stage membrane-regulated oxygen supply system for aquaculture includes a membrane separation unit, a pressure reducer, a heat exchanger, a ball valve, a flow meter, and a shut-off valve connected in sequence. The shut-off valve is connected to a microporous aeration network at the bottom of the pond via a pipeline. A multi-parameter water quality analyzer is placed in the pond water, and a controller is located outside the pond. The multi-parameter water quality analyzer, the membrane separation unit, the ball valve, and the flow meter are all electrically connected to the controller. The multi-parameter water quality analyzer transmits the monitored water quality parameters to the controller, and the controller controls the membrane separation unit, the ball valve, and the flow meter to regulate the oxygen supply.

[0007] Furthermore, the membrane separation unit includes a primary membrane separator, a secondary membrane separator, and a tertiary membrane separator. The air inlet of the primary membrane separator is an air inlet. The permeate-side air outlet of the primary membrane separator is connected to the air inlet of the secondary membrane separator. The stagnation-side air outlet of the primary membrane separator is connected to the outside. The permeate-side air outlet of the secondary membrane separator is connected to both the air inlet of the primary membrane separator and the air inlet of the pressure reducer. The stagnation-side air outlet of the secondary membrane separator is connected to both the air inlet of the primary membrane separator and the air inlet of the tertiary membrane separator. The permeate-side air outlet of the tertiary membrane separator is connected to both the air inlet of the secondary membrane separator and the air inlet of the pressure reducer. The stagnation-side air outlet of the tertiary membrane separator is connected to the air inlet of the primary membrane separator.

[0008] Furthermore, the inlet of the first-stage membrane separator is equipped with a first compressor, the pipeline between the permeate-side outlet of the first-stage membrane separator and the inlet of the second-stage membrane separator is equipped with a second compressor, the pipeline between the permeate-side outlet of the second-stage membrane separator and the inlet of the first-stage membrane separator is equipped with a third compressor, and the pipeline between the permeate-side outlet of the tertiary membrane separator and the inlet of the second-stage membrane separator is equipped with a fourth compressor.

[0009] Furthermore, the permeate-side outlet of the secondary membrane separator is connected to a first splitter. One gas path of the first splitter is connected to the third compressor and then leads to the air inlet between the first compressor and the primary membrane separator. The other gas path of the first splitter is connected to the pressure reducer and then leads to the heat exchanger.

[0010] The stagnation side outlet of the secondary membrane separator is connected to a second distributor. One of the air paths of the second distributor is connected to the front end of the first compressor, and the other air path of the second distributor is connected to the air inlet of the tertiary membrane separator.

[0011] Furthermore, the permeate-side outlet of the three-stage membrane separator is connected to a third distributor. One gas path of the third distributor is connected to the fourth compressor and then leads to the air inlet between the second compressor and the second-stage membrane separator. The other gas path of the third distributor is connected to the pressure reducer and then leads to the heat exchanger. The stagnation-side outlet of the three-stage membrane separator leads to the front end of the first compressor.

[0012] Furthermore, the membranes in the primary membrane separator, secondary membrane separator, and tertiary membrane separator are respectively polydimethylsiloxane membrane, inherently microporous polymer membrane, and... 5218 blend membrane.

[0013] Furthermore, the multi-parameter water quality analyzer is used to detect the temperature, chemical oxygen demand, dissolved oxygen, pH value, and oil content in pond water.

[0014] Furthermore, the microporous aeration network is submerged at the bottom of the pond, and the oxygen-rich flow enters the pond water in the form of bubbles through the small holes in the microporous aeration network.

[0015] Furthermore, the microporous aeration network includes multiple microporous aeration pipes, which are arranged sequentially at the bottom of the pond.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By incorporating a flow divider within the membrane separation unit, the oxygen supply system can more easily alter the series and parallel connection of the membrane separators, thereby changing the oxygen content and concentration. The flow controller and multi-parameter water quality analyzer enable real-time, visual monitoring. When the multi-parameter water quality analyzer detects poor water quality or low dissolved oxygen levels, requiring oxygenation, the oxygen supply can be promptly and controllably adjusted by controlling the flow divider, ball valve, and flow controller within the membrane separation unit. The entire oxygen supply system is highly adaptable and has a wide range of applications, solving the problems of high energy consumption, low efficiency, uneven oxygen supply, and oxygen overload in existing oxygenation equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the membrane separation unit structure in Embodiment 2 of the present invention.

[0020] Figure 3 This is a schematic diagram of the membrane separation unit structure in Embodiment 3 of the present invention.

[0021] Figure 4 This is a schematic diagram of the membrane separation unit structure in Embodiment 4 of the present invention.

[0022] Figure 5 This is a schematic diagram of the membrane separation unit structure in Embodiment 5 of the present invention.

[0023] Figure 6 This is a schematic diagram of the membrane separation unit structure in Embodiment 6 of the present invention.

[0024] Figure 7 This is a schematic diagram of the overall structure of Comparative Example 1 of the present invention.

[0025] Among them, 1-first-stage membrane separator, 2-second-stage membrane separator, 3-third-stage membrane separator, 4-pressure reducer, 5-heat exchanger, 6-ball valve, 7-flow controller, 8-stop valve, 9-pond, 10-microporous aeration network, 11-multi-parameter water quality analyzer, C1-first compressor, C2-second compressor, C3-third compressor, C4-fourth compressor, S1-first distributor, S2-second distributor, S3-third distributor. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment provides a multi-stage membrane regulation oxygen supply system for aquaculture, including a membrane separation unit, a pressure reducer 4, a heat exchanger 5, a ball valve 6, a flow controller 7, and a shut-off valve 8 connected in sequence. The shut-off valve 8 is connected to a microporous aeration network 10 at the bottom of a pond 9 via a pipeline. A multi-parameter water quality analyzer 11 is placed in the pond water, and a controller is provided outside the pond. The multi-parameter water quality analyzer 11, the membrane separation unit, the ball valve 6, and the flow controller 7 are all electrically connected to the controller. The multi-parameter water quality analyzer 11 transmits the monitored water quality parameters to the controller, and the controller controls the membrane separation unit, the ball valve 6, and the flow controller 7 to regulate the oxygen supply.

[0029] It should be noted that the multi-parameter water quality analyzer 11 is used to detect the temperature, chemical oxygen demand, dissolved oxygen, pH value and oil content in pond water.

[0030] This solution allows for controllable adjustment of the oxygen supply to the pond, thus addressing the problems of high energy consumption, low efficiency, uneven oxygen supply, and oxygen overload in existing aeration equipment.

[0031] In a further embodiment, the membrane separation unit includes a primary membrane separator 1, a secondary membrane separator 2, and a tertiary membrane separator 3. The air inlet of the primary membrane separator 1 is an air inlet. The permeate-side air outlet of the primary membrane separator 1 is connected to the air inlet of the secondary membrane separator 2. The stagnation-side air outlet of the primary membrane separator 1 is connected to the outside. The permeate-side air outlet of the secondary membrane separator 2 is connected to both the air inlet of the primary membrane separator 1 and the air inlet of the pressure reducer 4. The stagnation-side air outlet of the secondary membrane separator 2 is connected to both the air inlet of the primary membrane separator 1 and the air inlet of the tertiary membrane separator 3. The permeate-side air outlet of the tertiary membrane separator 3 is connected to both the air inlet of the secondary membrane separator 2 and the air inlet of the pressure reducer 4. The stagnation-side air outlet of the tertiary membrane separator 3 is connected to the air inlet of the primary membrane separator 1.

[0032] Preferably, the inlet of the primary membrane separator 1 is equipped with a first compressor C1, the pipeline between the permeate side outlet of the primary membrane separator 1 and the inlet of the secondary membrane separator 2 is equipped with a second compressor C2, the pipeline between the permeate side outlet of the secondary membrane separator 2 and the inlet of the primary membrane separator 1 is equipped with a third compressor C3, and the pipeline between the permeate side outlet of the tertiary membrane separator 3 and the inlet of the secondary membrane separator 2 is equipped with a fourth compressor C4.

[0033] Preferably, the permeate-side outlet of the secondary membrane separator 2 is connected to a first distributor S1. One gas path of the first distributor S1 is connected to the third compressor C3 and then leads to the inlet of the first compressor C1 and the primary membrane separator 1. The other gas path of the first distributor S1 is connected to the pressure reducer 4 and then leads to the heat exchanger 5. The stagnation-side outlet of the secondary membrane separator 2 is connected to a second distributor S2. One gas path of the second distributor S2 leads to the front end of the first compressor C1, and the other gas path of the second distributor S2 is connected to the inlet of the tertiary membrane separator 3.

[0034] The permeate side outlet of the three-stage membrane separator 3 is connected to a third distributor S3. One gas path of the third distributor S3 is connected to the fourth compressor C4 and then leads to the inlet of the second compressor C2 and the second-stage membrane separator 2. The other gas path of the third distributor S3 is connected to the pressure reducer 4 and then leads to the heat exchanger 5. The stagnation side outlet of the three-stage membrane separator 3 leads to the front end of the first compressor C1.

[0035] With this scheme, a first splitter S1 is connected to the permeate side outlet of the secondary membrane separator 2, a second splitter S2 is connected to the stagnation side outlet of the secondary membrane separator 2, and a third splitter S3 is connected to the permeate side outlet of the tertiary membrane separator 3. This allows for more convenient replacement of the series and parallel connection of the membrane separators, thereby changing the oxygen content and concentration.

[0036] In a further embodiment, the membranes in the primary membrane separator 1, the secondary membrane separator 2, and the tertiary membrane separator 3 are respectively a polydimethylsiloxane membrane, an inherently microporous polymer membrane, and a... 5218 blend membrane.

[0037] In a further embodiment, the microporous aeration network 10 is submerged at the bottom of the pond, and oxygen-enriched air flows into the pond water in the form of bubbles through the small holes in the microporous aeration network 10. Preferably, the microporous aeration network 10 includes multiple microporous aeration pipes, which are arranged sequentially at the bottom of the pond.

[0038] In this embodiment, the stagnation gas of the first-stage membrane separator is R1, the permeate gas of the first-stage membrane separator is P1, the stagnation gas of the second-stage membrane separator is R2, the permeate gas of the second-stage membrane separator is P2, the stagnation gas of the third-stage membrane separator is R3, and the permeate gas of the third-stage membrane separator is P3.

[0039] The working principle of gas propagation in this embodiment is as follows:

[0040] like Figure 1 As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0041] After the gas flow enters the secondary membrane separator and is separated by the membrane, the permeate gas P2 passes through the splitter S1. Part of the gas P2 enters the compressor C3 and then circulates in the primary membrane separator, while the other part of the gas P2 enters the pressure reducer. The sludge gas R2 passes through the splitter S2. Part of the gas R2 enters the compressor C1 and then circulates in the primary membrane separator, while the other part of the gas R2 enters the tertiary membrane separator.

[0042] After the gas flow enters the three-stage membrane separator, the permeate gas P3 passes through the splitter S3. Part of the gas P3 enters the compressor C4 and then enters the second-stage membrane separator for circulation, while the other part of the gas P3 enters the pressure reducer. The sludge gas R3 enters the compressor C1 and then enters the first-stage membrane separator for circulation.

[0043] The gas entering the pressure reducer is O2-rich gas, which then enters heat exchanger 5. The oxygen flow rate is controlled by ball valve 6 and flow meter 7, while shut-off valve 8 is open. The O2-rich gas flows through pipes into the microporous aeration network, which is submerged at the bottom. The O2-rich gas enters the pond water as bubbles through the small holes in the network, increasing the contact area between the numerous bubbles and the water, thus accelerating the dissolution rate of the O2. A multi-parameter water quality analyzer is placed in the pond to measure the water temperature, chemical oxygen demand (COD), dissolved oxygen, pH, and oil content. The flow meter and multi-parameter water quality analyzer are connected to a controller for real-time, visual monitoring and timely adjustment of the oxygenation rate.

[0044] Example 2

[0045] In this embodiment, as Figure 2As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0046] After the gas flow enters the secondary membrane separator, the gas flow passes through the membrane and undergoes separation. The permeate gas P2 passes through the splitter S1 and all of it enters the compressor C3, and then enters the primary membrane separator for circulation. The sludge gas R2 passes through the splitter S2. Part of the gas R2 enters the compressor C1 and then enters the primary membrane separator for circulation, while the other part of the gas R2 enters the tertiary membrane separator.

[0047] After the gas flow enters the three-stage membrane separator, the permeate gas P3 passes through the splitter S3. Part of the gas P3 enters the compressor C4 and then enters the second-stage membrane separator for circulation, while the other part of the gas P3 enters the pressure reducer. The sludge gas R3 enters the compressor C1 and then enters the first-stage membrane separator for circulation.

[0048] The gas entering the pressure reducer is O2-rich gas, which then enters heat exchanger 5. The oxygen flow rate is controlled by ball valve 6 and flow meter 7, while shut-off valve 8 is open. The O2-rich gas flows through pipes into the microporous aeration network, which is submerged at the bottom. The O2-rich gas enters the pond water as bubbles through the small holes in the network, increasing the contact area between the numerous bubbles and the water, thus accelerating the dissolution rate of the O2. A multi-parameter water quality analyzer is placed in the pond to measure the water temperature, chemical oxygen demand (COD), dissolved oxygen, pH, and oil content. The flow meter and multi-parameter water quality analyzer are connected to a controller for real-time, visual monitoring, allowing for timely adjustments to the oxygenation level.

[0049] Example 3

[0050] In this embodiment, as Figure 3 As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0051] After the gas flow enters the secondary membrane separator, the gas flow passes through the membrane and undergoes separation. The permeate gas P2 passes through the splitter S1 and all of it enters the compressor C3, and then enters the primary membrane separator for circulation. The sludge gas R2 passes through the splitter S2. Part of the gas R2 enters the compressor C1 and then enters the primary membrane separator for circulation, while the other part of the gas R2 enters the tertiary membrane separator.

[0052] After the gas flow enters the three-stage membrane separator, the gas flow on the permeate side P3 passes through the splitter S3 and all of gas P3 enters the pressure reducer; the gas flow on the stagnation side R3 enters the compressor C1 and then enters the first-stage membrane separator for circulation.

[0053] The gas entering the pressure reducer is O2-rich gas, which then enters heat exchanger 5. The oxygen flow rate is controlled by ball valve 6 and flow meter 7, while shut-off valve 8 is open. The O2-rich gas flows through pipes into the microporous aeration network, which is submerged at the bottom. The O2-rich gas enters the pond water as bubbles through the small holes in the network, increasing the contact area between the numerous bubbles and the water, thus accelerating the dissolution rate of the O2. A multi-parameter water quality analyzer is placed in the pond to measure the water temperature, chemical oxygen demand (COD), dissolved oxygen, pH, and oil content. The flow meter and multi-parameter water quality analyzer are connected to a computer control unit for real-time, visual monitoring and timely adjustment of the oxygenation level.

[0054] Example 4

[0055] In this embodiment, as Figure 4 As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0056] After the gas flow enters the secondary membrane separator, the gas P2 on the permeate side passes through the splitter S1 and all of it enters the pressure reducer. The gas R2 on the retentate side passes through the splitter S2. Part of the gas R2 enters the compressor C1 and then enters the primary membrane separator for circulation, while the other part of the gas R2 enters the tertiary membrane separator.

[0057] After the gas flow enters the three-stage membrane separator, the gas flow on the permeate side P3 passes through the splitter S3 and all of gas P3 enters the pressure reducer; the gas flow on the stagnation side R3 enters the compressor C1 and then enters the first-stage membrane separator for circulation.

[0058] The gas entering the pressure reducer is O2-rich gas, which then enters heat exchanger 5. The oxygen flow rate is controlled by ball valve 6 and flow meter 7, while shut-off valve 8 is open. The O2-rich gas flows through pipes into the microporous aeration network, which is submerged at the bottom. The O2-rich gas enters the pond water as bubbles through the small holes in the network, increasing the contact area between the numerous bubbles and the water, thus accelerating the dissolution rate of the O2. A multi-parameter water quality analyzer is placed in the pond to measure the water temperature, chemical oxygen demand (COD), dissolved oxygen, pH, and oil content. The flow meter and multi-parameter water quality analyzer are connected to a computer control unit for real-time, visual monitoring and timely adjustment of the oxygenation level.

[0059] Example 5

[0060] In this embodiment, as Figure 5 As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0061] After the gas flow enters the secondary membrane separator and is separated by the membrane, the permeate gas P2 passes through the splitter S1, and part of the gas P2 enters the compressor C3 and then enters the primary membrane separator for circulation, while the other part of the gas P2 enters the pressure reducer; the stagnation gas R2 passes through the splitter S2, and all of the gas R2 enters the compressor C1 and then enters the primary membrane separator for circulation.

[0062] The gas entering the pressure reducer is O2-rich gas, which then enters heat exchanger 5. The oxygen flow rate is controlled by ball valve 6 and flow meter 7, while shut-off valve 8 is open. The O2-rich gas flows through pipes into the microporous aeration network, which is submerged at the bottom. The O2-rich gas enters the pond water as bubbles through the small holes in the network, increasing the contact area between the numerous bubbles and the water, thus accelerating the dissolution rate of the O2. A multi-parameter water quality analyzer is placed in the pond to measure the water temperature, chemical oxygen demand (COD), dissolved oxygen, pH, and oil content. The flow meter and multi-parameter water quality analyzer are connected to a computer control unit for real-time, visual monitoring and timely adjustment of the oxygenation level.

[0063] Example 6

[0064] In this embodiment, as Figure 6 As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0065] After the gas flow enters the secondary membrane separator, the gas flow passes through the membrane and is separated. The permeate gas P2 passes through the splitter S1 and all of the gas P2 enters the pressure reducer. The stagnation gas R2 passes through the splitter S2 and all of the gas R2 enters the compressor C1, and then enters the primary membrane separator for circulation.

[0066] The gas entering the pressure reducer is O2-rich gas, which then enters heat exchanger 5. The oxygen flow rate is controlled by ball valve 6 and flow meter 7, while shut-off valve 8 is open. The O2-rich gas flows through pipes into the microporous aeration network, which is submerged at the bottom. The O2-rich gas enters the pond water as bubbles through the small holes in the network, increasing the contact area between the numerous bubbles and the water, thus accelerating the dissolution rate of the O2. A multi-parameter water quality analyzer is placed in the pond to measure the water temperature, chemical oxygen demand (COD), dissolved oxygen, pH, and oil content. The flow meter and multi-parameter water quality analyzer are connected to a computer control unit for real-time, visual monitoring and timely adjustment of the oxygenation rate.

[0067] Comparative Example 1:

[0068] In this comparative example, such as Figure 7 As shown, air is compressed by compressor C1 and then enters the first-stage membrane separator. After the airflow passes through the membrane, the permeate gas P1 enters compressor C2 and then enters the second-stage membrane separator; the sludge gas R1 is N2-rich gas and is collected.

[0069] After the gas flow enters the secondary membrane separator, the permeate gas P2 enters the pressure reducer after being separated by the membrane; the sludge gas R2 enters the compressor C1, and then enters the primary membrane separator for circulation.

[0070] The gas entering the pressure reducer 3 is O2-rich gas, and then enters the heat exchanger 5. Ball valve 6 and shut-off valve 8 are in the open state. After passing through ball valve 6 and shut-off valve 8, the O2-rich gas flows through pipes into the microporous aeration network. The microporous aeration network is submerged at the bottom of the pond 9. The O2-rich gas enters the pond water in the form of bubbles from the small holes in the microporous aeration network. The large number of bubbles increases the contact area between the gas and the pond water, accelerating the dissolution rate of the O2-rich gas.

[0071] As can be seen from Examples 1-6 and Comparative Example 1 above, although Comparative Example 1 can also deliver O2 to pond water in the form of bubbles, it cannot regulate the oxygen supply, resulting in problems such as high energy consumption, uneven oxygen supply, and oxygen overload. In contrast, the flow controller and multi-parameter water quality analyzer of the present invention can achieve visualized real-time monitoring. When the multi-parameter water quality analyzer detects poor water quality or low dissolved oxygen in the water, indicating a need for oxygenation, it transmits the data to the controller. The controller, based on the actual pond water quality, controls the first, second, and third diverters of the membrane separation unit, the ball valve, and the flow controller to adjust the oxygen supply in a timely manner, thereby promoting the healthy development of aquaculture.

[0072] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-stage membrane regulated oxygen supply system for aquaculture, characterized by, The device comprises sequentially connected membrane separation unit, pressure reducer, heat exchanger, ball valve, flow control meter and stop valve, the stop valve is communicated with the microporous aeration pipe network at the bottom of the pond through pipeline, the multi-parameter water quality tester is placed in the pond water body, the controller is arranged outside the pond, the multi-parameter water quality tester, the membrane separation unit, the ball valve and the flow control meter are electrically connected with the controller, the multi-parameter water quality tester transmits the monitored water quality parameters to the controller, and the controller controls the membrane separation unit, the ball valve and the flow control meter to adjust the oxygen supply amount. The membrane separation unit comprises a first-stage membrane separator, a second-stage membrane separator and a third-stage membrane separator, the air inlet of the first-stage membrane separator is an air inlet, the permeation side air outlet of the first-stage membrane separator is communicated with the air inlet of the second-stage membrane separator, the retention side air outlet of the first-stage membrane separator is communicated with the outside, the permeation side air outlet of the second-stage membrane separator is respectively communicated with the air inlet of the first-stage membrane separator and the air inlet of the pressure reducer, the retention side air outlet of the second-stage membrane separator is respectively communicated with the air inlet of the first-stage membrane separator and the air inlet of the third-stage membrane separator, the permeation side air outlet of the third-stage membrane separator is respectively communicated with the air inlet of the second-stage membrane separator and the air inlet of the pressure reducer, and the retention side air outlet of the third-stage membrane separator is communicated with the air inlet of the first-stage membrane separator. The air inlet of the first-stage membrane separator is provided with a first compressor, the pipeline between the permeation side air outlet of the first-stage membrane separator and the air inlet of the second-stage membrane separator is provided with a second compressor, the pipeline between the permeation side air outlet of the second-stage membrane separator and the air inlet of the first-stage membrane separator is provided with a third compressor, and the pipeline between the permeation side air outlet of the third-stage membrane separator and the air inlet of the second-stage membrane separator is provided with a fourth compressor. The permeation side air outlet of the second-stage membrane separator is connected with a first flow divider, one of the air paths of the first flow divider is connected with the third compressor and then connected to the pipeline between the first compressor and the air inlet of the first-stage membrane separator, and the other air path of the first flow divider is connected with the pressure reducer and then connected to the heat exchanger. The retention side air outlet of the second-stage membrane separator is connected with a second flow divider, one of the air paths of the second flow divider is connected to the front end of the first compressor, and the other air path of the second flow divider is connected with the air inlet of the third-stage membrane separator. The permeation side air outlet of the third-stage membrane separator is connected with a third flow divider, one of the air paths of the third flow divider is connected with the fourth compressor and then connected to the pipeline between the second compressor and the air inlet of the second-stage membrane separator, the other air path of the third flow divider is connected with the pressure reducer and then connected to the heat exchanger, and the retention side air outlet of the third-stage membrane separator is connected to the front end of the first compressor.

2. The multi-stage membrane oxygen regulation system for aquaculture of claim 1, wherein, The membranes in the primary, secondary and tertiary membrane separators are polydimethylsiloxane, intrinsic microporous polymer and PIM-1 & Matrimid, respectively ® 5218 blend membrane.

3. The multi-stage membrane oxygen regulation system for aquaculture of claim 1, wherein, The multi-parameter water quality tester is used for detecting the temperature, chemical oxygen demand, dissolved oxygen, pH value and oil content in the water of the pond water body.

4. The multi-stage membrane oxygen regulation system for aquaculture of claim 1, wherein, The microporous aeration pipe network is sunk in the pond water bottom, and the oxygen-rich gas flow enters the pond water in the form of bubbles from the small holes on the microporous aeration pipe network.

5. The multi-stage membrane oxygen regulation system for aquaculture of claim 4, wherein, The micro-porous aeration pipe network comprises a plurality of micro-porous aeration pipes arranged in sequence at the bottom of the pond.

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