A kind of aquaculture micro-bubble oxygenation device based on carbon dioxide hydrate decomposition

Abstract

The application discloses a kind of based on carbon dioxide hydrate decomposition aquaculture micro-bubble oxygenation device, belongs to aquaculture equipment technical field, to solve for the oxygenation equipment of existing aquaculture high energy consumption, carbon source supply imbalance, temperature control function loss and so on problem, main point is the secondary liquid hydrate storage tank for containing liquid hydrate;Heating sheet is set in the secondary liquid hydrate storage tank;The microporous diffuser is provided with the open hole of interval arrangement;The connecting channel is arranged between the secondary liquid hydrate storage tank and the microporous diffuser;The dissolved oxygen sensor is arranged in aquaculture water area, for collecting water area dissolved oxygen degree;The pH sensor is arranged in aquaculture water area, for collecting water area pH;The controller is used to receive the dissolved oxygen degree, pH collected by sensor, according to the threshold range set in controller according to data acquisition value, judge whether heating sheet is heated to secondary liquid hydrate storage tank, can be used for aquaculture purposes.

Description

Technical Field

[0001] This invention relates to the field of aquaculture equipment technology, specifically a microbubble aeration device based on the decomposition of carbon dioxide hydrates. Background Technology

[0002] Currently, aquaculture generally faces the dual challenges of high energy consumption for oxygenation and an imbalance in carbon source supply. Traditional oxygenation technologies mainly rely on mechanical aeration equipment (such as impeller aerators) and pure oxygen injection systems. These methods have significant drawbacks: traditional mechanical aeration consumes a lot of energy and produces large-diameter bubbles, resulting in low dissolved oxygen efficiency; while pure oxygen systems can increase dissolved oxygen levels, they cannot regulate the pH of the water and require the addition of carbonate chemicals, which increases costs and may cause ecological imbalance.

[0003] In recent years, some new technologies have attempted to combine carbon dioxide utilization with oxygenation, such as using micro-nano bubble generators in conjunction with CO2 cylinders for gas supply. Although such solutions can simultaneously achieve oxygenation and carbon source replenishment, they have the following problems: (1) They lack temperature control functions and will accelerate CO2 escape during the high-temperature period in summer, making the temperature and pH of the pool unsuitable for the survival of cold-water fish (such as rainbow trout and sturgeon); (2) The bubbles have poor stability, short duration of action, require frequent aeration, and have high energy consumption.

[0004] Hydrate technology offers a new approach to solving the aforementioned problems. Carbon dioxide hydrates, upon decomposition, generate microbubbles to oxygenate and dissolve the carbon source, while simultaneously absorbing heat to lower the water temperature, achieving integrated control of oxygenation, carbon supply, and temperature regulation. The microbubble method theoretically increases oxygenation efficiency to 2-3 times that of traditional mechanical aeration, demonstrating significant advantages. However, the application of hydrates in aquaculture currently faces technological gaps. The difficulties in applying hydrates to cold-water fish farming lie in: the lack of suitable slow-release hydrate devices for aquaculture ponds; the lack of a coordinated control system for oxygenation, temperature control, and carbon source supply; and the difficulty in meeting the temperature and oxygen content requirements of cold-water fish using hydrate technology. Summary of the Invention

[0005] To address the problems of high energy consumption, carbon source imbalance, and lack of temperature control in existing aquaculture aeration equipment, this application provides a microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition, comprising:

[0006] A secondary liquid hydrate storage tank, wherein the secondary liquid hydrate storage tank is used to hold liquid hydrate;

[0007] A heating element is disposed in the secondary liquid hydrate storage tank;

[0008] A microporous diffuser, wherein the microporous diffuser is provided with spaced-apart openings and is placed in an aquaculture water area;

[0009] A connection channel is provided between the secondary liquid hydrate storage tank and the microporous diffuser;

[0010] A control valve is disposed on the connection channel;

[0011] A pressure reducing valve, wherein the pressure reducing valve is disposed on a connection channel downstream of the control valve;

[0012] A dissolved oxygen sensor, which is installed in aquaculture waters to collect dissolved oxygen levels in the water;

[0013] A pH sensor is installed in the aquaculture water area to collect the pH of the water.

[0014] The controller receives dissolved oxygen and pH data from the sensors and determines whether to drive the heating element to heat the secondary liquid hydrate storage tank based on the threshold range set in the controller for the data acquisition values.

[0015] In this process, heating causes the hydrates to decompose and carbon dioxide gas is introduced into the water through a connecting channel;

[0016] If heating is detected, the control valve will open.

[0017] According to some embodiments of the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition in some embodiments of this application, the priority of data collection is determined from high to low as dissolved oxygen level and pH. Only when the dissolved oxygen level is within the threshold range is the pH level used to determine whether to drive heating.

[0018] According to some embodiments of the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition in this application, the controller's judgment and drive execution steps are as follows:

[0019] S10. Determine whether to drive heating based on dissolved oxygen levels:

[0020] When the dissolved oxygen level is below the first low threshold, heating is activated to provide carbon dioxide gas dissolved in the water, promoting algal photosynthesis and increasing the oxygen content in the water.

[0021] When the dissolved oxygen level is higher than the first high threshold, the heating process is stopped.

[0022] If the solubility measurement value is within the threshold range, proceed to step S20;

[0023] S20. Determine whether to drive heating based on pH:

[0024] When the pH value is higher than the first high threshold, heating is driven to provide carbon dioxide gas dissolved in the water to neutralize the alkalinity;

[0025] When the pH value is below the first low threshold, the heating process is stopped.

[0026] The microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition according to some embodiments of this application further includes a temperature sensor, which is installed in the aquaculture water area to collect the water temperature.

[0027] Heating is only activated when the pH value is within the threshold range, based on the temperature.

[0028] If the pH value is within the threshold range, proceed to step S30;

[0029] S30. Determine whether to activate heating based on temperature:

[0030] When the temperature reading is higher than the first high threshold, heating is activated, and the hydrates decompose to release cold energy to lower the water temperature.

[0031] If the temperature reading is below the first low threshold, the heating process will stop.

[0032] The microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition according to some embodiments of this application also includes

[0033] A primary solid hydrate storage tank, wherein the primary solid hydrate storage tank is provided with a porous support plate for layered loading of carbon dioxide hydrate particles.

[0034] A hydrate channel is provided between the primary solid hydrate storage tank and the secondary liquid hydrate storage tank.

[0035] A control valve is provided on the hydrate channel to control the supply of the solid hydrate to the secondary liquid hydrate storage tank.

[0036] According to some embodiments of the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition in this application, the porous support plate has a pore diameter of 3-8 mm and a plate spacing of 5-10 cm.

[0037] According to some embodiments of the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition in this application, the microporous diffuser is made of a hydrophobic PTFE membrane with a pore size of 10-50 μm. The microporous diffuser is installed at an angle of 15-30° at the bottom of the aquaculture pond to form a directional water flow. The bubble generation rate of the microporous diffuser is 0.5-2 L / min·m. 2 .

[0038] According to some embodiments of the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition in this application, the threshold range of dissolved oxygen is 5-8 mg / L, and the threshold range of pH value is 7.5-8.0.

[0039] According to some embodiments of the present application, the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition is provided, wherein the solid hydrate storage tank is made of stainless steel or pressure-resistant polypropylene.

[0040] According to some embodiments of the microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition in this application, the secondary liquid hydrate storage tank is made of stainless steel or pressure-resistant polypropylene.

[0041] The present invention has the following beneficial effects:

[0042] This invention integrates functions, and for the first time combines the microbubble oxygenation, carbon source supply and phase change temperature control functions of hydrate decomposition into one, solving the complexity problem of traditional equipment requiring multiple systems to be connected in parallel.

[0043] This invention is ecologically adaptable and meets the survival requirements of cold-water fish such as rainbow trout and sturgeon (12-18℃ water temperature, 5-8mg / L dissolved oxygen) through closed-loop control of three parameters: pH, dissolved oxygen, and temperature.

[0044] This invention represents a breakthrough in energy efficiency, saving over 30% more energy compared to mechanical oxygenation equipment, and achieving a CO2 utilization rate of 60%-70% (compared to only 20%-25% for traditional gas cylinder methods).

[0045] This invention is user-friendly, with a modular design that supports rapid deployment. Farmers can intuitively determine the timing of feeding through the observation window without requiring professional training. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the overall structure of the hydrate microbubble oxygenation device of the present invention.

[0047] 1. Primary pressure-resistant solid hydrate storage tank; 2. Porous support plate; 3. Secondary pressure-resistant liquid hydrate storage tank; 4. Heating element; 5. Pressure reducing valve; 6. Diffuser; 7. Temperature sensor; 8. pH sensor; 9. Dissolved oxygen sensor; 10. Control valve; 11. Control valve. Detailed Implementation

[0048] The implementation of the present invention will be described in detail through the following embodiments.

[0049] Example 1: This invention provides an integrated microbubble aeration and temperature control device based on carbon dioxide hydrate decomposition. Through the synergistic design of hydrate slow-release gas supply and intelligent temperature control, it achieves precise regulation of dissolved oxygen and ecological balance in the cold-water fish farming environment. This invention's microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition is a pressure-resistant hydrate storage tank, comprising a primary pressure-resistant solid hydrate storage tank 1: internally equipped with multiple layers of porous support plates 2, with a pore diameter of 3-8mm and a plate spacing of 5-10cm, for layered loading of carbon dioxide hydrate particles with a particle size of 3-5mm, operating pressure 0.1-0.3MPa, and made of stainless steel or pressure-resistant polypropylene. A secondary pressure-resistant liquid hydrate storage tank 3 operates at a pressure of 0.3-1.5MPa and is made of stainless steel or pressure-resistant polypropylene.

[0050] Microporous diffuser 6: Connected to the secondary pressure-resistant liquid hydrate storage tank 3 via pressure reducing valve 5, it is made of hydrophobic PTFE membrane (pore size 10-50μm), and installed at an angle of 15-30° on the bottom of the tank, generating bubbles at a rate of 0.5-2 L / min·m. 2 ;

[0051] Intelligent control module: includes heating element 4 (power 50-200W) attached to the outer wall of the secondary storage tank, temperature sensor 7 (accuracy ±0.5℃), dissolved oxygen sensor 9 and pH sensor 8.

[0052] Set dissolved oxygen control zones: the start threshold is 5 mg / L, and the stop threshold is 8 mg / L. That is, heating starts when the dissolved oxygen level is below 5 mg / L and stops when the dissolved oxygen level is above 8 mg / L.

[0053] Set the pH control range: start threshold is 8.0, stop threshold is 7.5. That is, heating starts when the pH is above 8.0 and stops when the pH is below 7.5.

[0054] Dissolved oxygen control should be prioritized, followed by pH control. Temperature control is an auxiliary control with the lowest priority.

[0055] The decomposition rate can be controlled using a PID algorithm.

[0056] The specific working principle is as follows:

[0057] Intelligent triggering stage: The control unit monitors dissolved oxygen (0-20mg / L), pH (6-9) and water temperature data in real time; when the dissolved oxygen level is lower than the threshold, the heating element (50-200W) is activated to raise the temperature of hydrates in the secondary storage tank to 8-10℃ to trigger decomposition.

[0058] Gas conversion stage: The CO2 gas produced by decomposition enters the PTFE microporous diffuser through a pressure reducing valve (0.1-0.8MPa), forming microbubbles with a diameter <50μm; a small amount of CO2 dissolves into HCO3. -The pH is adjusted, and other substances exist in the form of bubbles. CO2 promotes oxygen production through photosynthesis in algae, and the movement of bubbles drives water circulation, improving the uniformity of dissolved oxygen.

[0059] Temperature regulation stage: The decomposition of hydrates absorbs heat to suppress high temperatures in summer, and natural recombination releases heat to assist in winter heat preservation, maintaining the water temperature at 12-18℃.

[0060] Ecological cycle stage: Dissolved CO2 promotes the growth and reproduction of algae through photosynthesis and releases oxygen, forming an integrated process of "hydrate decomposition → algal oxygen production → dissolved oxygen recovery"; when pH < 7.5, the intelligent temperature control module reduces or stops the decomposition rate to prevent excessive CO2 from causing acidification.

[0061] Example 2: As Figure 1 As shown, this embodiment uses a 5m×3m×1.5m rainbow trout breeding pond as the implementation scenario. The main body of the device includes three parts: a two-stage pressure-resistant hydrate storage tank, a microporous diffuser, and an intelligent temperature control unit.

[0062] The first-level pressure-resistant solid hydrate storage tank 1 is a horizontal cylindrical design with a diameter of 0.6m and a length of 1.2m, made of pressure-resistant polypropylene. The tank 1 has internally layered porous support plates 2 with a hole diameter of 3-8mm and a plate spacing of 5-10cm. The working pressure is set at 0.1-0.3MPa (corresponding to a hole diameter of 3-8mm). It is used to load CO2 hydrate particles with a particle size of 3-5mm. The second-level pressure-resistant liquid hydrate storage tank 3 is a horizontal cylindrical design with a diameter of 0.5m and a length of 1m, also made of pressure-resistant polypropylene. The working pressure of tank 3 is set at 0.3-1.5MPa. Heating elements 4 with a power of 50-200W are attached to the outer wall.

[0063] The microporous diffuser 6 is connected to the secondary storage tank 3 via a pressure reducing valve 5. It is made of PTFE material with a pore size of 10-50μm. The diffuser 6 has a total length of 4m and is arranged along the long side of the tank bottom at an angle of 15-30° to ensure that the bubble movement can form an effective water circulation. The pressure reducing valve 5 is selected with an adjustment range of 0.1-0.8MPa.

[0064] The temperature sensor 7, pH sensor 8, and dissolved oxygen sensor 9 of the intelligent control module are connected to the heating element 4 via the control system, and are installed at a diagonal position 0.5m from the bottom of the tank. The dissolved oxygen control zones are set as follows: start threshold 5mg / L, stop threshold 8mg / L; pH control zones: start threshold 8.0, stop threshold 7.5; temperature control zones: start threshold 18℃, stop threshold 12℃. Dissolved oxygen control has the highest priority, followed by pH control, and temperature control is an auxiliary control with the lowest priority. Control valve 10 is installed on the pipeline between storage tank 1 and storage tank 3, and control valve 11 is installed on the pipeline between storage tank 3 and microporous diffuser 6, serving as a backup control channel.

[0065] During system operation, based on the control system's priority settings, when the detected dissolved oxygen concentration is below 5 mg / L, the control system automatically activates heating element 4 to promote hydrate decomposition in storage tank 3, while simultaneously adjusting the opening of pressure reducing valve 5 until the dissolved oxygen concentration is within the threshold range. When the detected pH is above 8.0 and the dissolved oxygen concentration is not above 8 mg / L, the control system automatically activates heating element 4 to promote hydrate decomposition in storage tank 3, while simultaneously adjusting the opening of pressure reducing valve 5 until the pH is within the threshold range. If the dissolved oxygen concentration exceeds the threshold of 8 mg / L during this period, the system will automatically stop. Temperature control serves as an auxiliary control; when both dissolved oxygen concentration and pH are within the control range, if the water temperature exceeds 17℃, the control system will automatically activate for regulation, utilizing the cooling energy released by hydrate decomposition at ambient temperature.

[0066] The present invention controls the microbubble system to increase the circulation velocity, which effectively improves the dissolved oxygen distribution in the pool.

[0067] During winter operation, the system automatically shuts off heating element 4, releasing heat by utilizing the natural recombination properties of hydrates in an environment of 2-5℃. Combined with a 200W auxiliary heater, it can maintain the aquaculture pond water temperature at no less than approximately 5℃ in an external environment of -10℃.

[0068] For equipment maintenance, both storage tanks 1 and 3 are equipped with observation windows to determine the remaining hydrate level. When the hydrate level drops below 20%, the intelligent control system will send a replenishment reminder. Routine maintenance only requires cleaning the surface of the microporous diffuser 6 every 2-3 weeks and replacing the sensor electrolyte every 3-4 months.

[0069] This invention relates to a device for oxygenation in aquaculture using carbon dioxide hydrate decomposition. The device comprises a two-stage pressure-resistant hydrate storage tank, a microporous diffuser, and an intelligent control module. The first-stage solid hydrate storage tank contains a porous support plate that layers hydrate particles. The solid hydrate undergoes a phase change to liquid and flows into the second-stage tank. Decomposition is triggered by temperature control, and CO2 microbubbles are generated by the PTFE microporous diffuser, providing a carbon source for algae to photosynthesize and produce oxygen. Simultaneously, the PTFE microporous diffuser is installed at an angle on the tank bottom, and the generated CO2 microbubbles form a circulation, improving the uniformity of dissolved oxygen in the tank. The intelligent module adjusts the decomposition rate based on temperature, dissolved oxygen, and pH data. This system simultaneously achieves oxygenation and dissolved CO2 to promote algal growth. It is particularly suitable for cold-water fish farming such as rainbow trout and sturgeon, maintaining an optimal environment of 12-18℃ water temperature and 7.5-8.0 pH. Compared to traditional aeration equipment, it saves more than 30% energy and requires no additional carbon source. The device has a compact structure and can be adapted to different sizes of aquaculture ponds through modular design, achieving dynamic oxygen-carbon balance and stable temperature control.

[0070] The above detailed description is a specific description of feasible embodiments of the present invention. These embodiments are not intended to limit the patent scope of the present invention. All equivalent implementations or modifications that do not depart from the present invention should be included in the patent scope of this case.

Claims

1. A microbubble aeration device for aquaculture based on the decomposition of carbon dioxide hydrate, characterized in that, include: A secondary liquid hydrate storage tank (3) is used to hold liquid hydrates; Heating element (4), the heating element (4) is installed in the secondary liquid hydrate storage tank (3); Microporous diffuser (6), wherein the microporous diffuser (6) is provided with spaced openings and is placed in the aquaculture water area; A connecting channel is provided between the secondary liquid hydrate storage tank (3) and the microporous diffuser (6); A control valve (11) is provided on the connection channel; Pressure reducing valve (5), the pressure reducing valve (5) is disposed on the connection channel downstream of the control valve (11); Dissolved oxygen sensor (9), which is installed in the aquaculture water area to collect dissolved oxygen levels in the water; pH sensor (8), the pH sensor (8) is installed in the aquaculture water area and is used to collect the pH of the water area; The controller is used to receive dissolved oxygen and pH data collected by the sensor and determine whether to drive the heating element to heat the secondary liquid hydrate storage tank (3) based on the threshold range set in the controller where the data collection value is located. In this process, heating causes the hydrates to decompose and carbon dioxide gas is introduced into the water through a connecting channel; If heating is detected, the control valve (11) will be opened. The priority of the collected data is determined from high to low as dissolved oxygen level and pH. Only when the solubility value is within the threshold range will the pH value be used to determine whether to drive heating.

2. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 1, characterized in that, The controller's judgment and driver execution steps are as follows: S10. Determine whether to drive heating based on dissolved oxygen levels: When the dissolved oxygen level is below the first low threshold, heating is activated to provide carbon dioxide gas dissolved in the water, promoting algal photosynthesis and increasing the oxygen content in the water. When the dissolved oxygen level is higher than the first high threshold, the heating process is stopped. If the solubility measurement value is within the threshold range, proceed to step S20; S20. Determine whether to drive heating based on pH: When the pH value is higher than the first high threshold, heating is driven to provide carbon dioxide gas dissolved in the water to neutralize the alkalinity; When the pH value is below the first low threshold, the heating process is stopped.

3. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 2, characterized in that, It also includes a temperature sensor (7), which is installed in the aquaculture water area to collect the water temperature; Heating is only activated when the pH value is within the threshold range, based on the temperature. If the pH value is within the threshold range, proceed to step S30; S30. Determine whether to activate heating based on temperature: When the temperature reading is higher than the first high threshold, heating is activated, and the hydrates decompose to release cold energy to lower the water temperature. If the temperature reading is below the first low threshold, the heating process will stop.

4. The microbubble aeration device for aquaculture based on carbon dioxide hydrate decomposition according to claim 1, characterized in that, Also includes A primary solid hydrate storage tank (1) is provided with a porous support plate (2) inside the primary solid hydrate storage tank (1) for layered loading of carbon dioxide hydrate particles; A hydrate channel is provided between the primary solid hydrate storage tank (1) and the secondary liquid hydrate storage tank (3); A control valve (10) is provided on the hydrate channel to control the supply of the solid hydrate to the secondary liquid hydrate storage tank (3).

5. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 4, characterized in that, The perforated bearing plate (2) has a hole diameter of 3-8 mm and a plate spacing of 5-10 cm.

6. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 1, characterized in that, The microporous diffuser (6) is made of hydrophobic PTFE membrane with a pore size of 10-50μm. The microporous diffuser (6) is installed at an angle of 15-30° at the bottom of the aquaculture pond to form a directional water flow. The bubble generation rate of the microporous diffuser (6) is 0.5-2L / min·m².

7. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 1, characterized in that, The threshold range for dissolved oxygen is 5-8 mg / L, and the threshold range for pH is 7.5-8.

0.

8. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 4, characterized in that, The primary solid hydrate storage tank (1) is made of stainless steel or pressure-resistant polypropylene.

9. The aquaculture microbubble aeration device based on carbon dioxide hydrate decomposition according to claim 1, characterized in that, The secondary liquid hydrate storage tank (3) is made of stainless steel or pressure-resistant polypropylene.

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