Carbon dioxide removal device of recirculating aquaculture system

Abstract

The invention belongs to the technical field of industrial aquaculture water treatment, and particularly relates to a carbon dioxide removal device of a recirculating aquaculture system. Comprising a tower body, an air guide unit, a diversion structure, a filler unit, an air pressure telescopic rod and a movable partition plate, the diversion structure and the air pressure telescopic rod are arranged on the upper portion and the lower portion of the tower body respectively, the diversion structure is used for diversion of aquaculture water, the air pressure telescopic rod is arranged at the bottom of the tower body and connected with the movable partition plate, and the filler unit is placed above the movable partition plate; the air guide unit is used for providing an air source for the air pressure telescopic rod, air flow enables the air pressure telescopic rod to lift the movable partition plate and the filler unit upwards, meanwhile, the air flow and aquaculture water flow reversely, and carbon dioxide in the aquaculture water is removed and discharged to the outer side of the tower body. Excessive accumulation of water carbon dioxide generated by intensive cultured fish respiratory metabolism and the like is effectively reduced, the acid drop phenomenon of the cultured water is avoided, and the negative effects of high-concentration carbon dioxide in the water on growth, development and physiological health of fishes are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial aquaculture water treatment, and in particular relates to a carbon dioxide removal device for a circulating aquaculture system. Background Art

[0002] Factory-scale recirculating aquaculture system (RAS) has great development prospects in intensive aquaculture due to its environmental friendliness, high efficiency and sustainability. However, with the increase of aquaculture density, accompanied by a substantial increase in fish respiration, metabolism and feeding amount, the concentration of carbon dioxide in the water in the system tends to accumulate excessively. The excessively high carbon dioxide partial pressure in the aquaculture water will inevitably make it difficult to increase oxygen in the water, thereby affecting the dissolved oxygen content in the water. At the same time, the continuous accumulation of carbon dioxide concentration in the water in the circulating water system will also lead to a decrease in the overall pH of the water, that is, it will cause water acidification and destroy the acid-base balance of the water. On the one hand, it will affect the filtration efficiency of the biological filter in the circulating water system and greatly reduce the water quality treatment capacity; on the other hand, it will also damage the gill tissue of fish, reduce the oxygen carrying capacity of blood, and even cause kidney calcium deposition, leading to kidney calcification, etc., which seriously affects the growth and development of fish. Therefore, it is a crucial link to achieve efficient removal of carbon dioxide from water in factory-scale recirculating aquaculture.

[0003] The traditional method to solve the excessive accumulation of carbon dioxide in aquaculture water is mainly to increase aeration and water exchange, but it will inevitably cause waste of energy and water resources, which is contrary to the original intention of recirculating aquaculture to a certain extent. In addition, there are also methods to neutralize carbon dioxide and adjust pH by adding alkaline substances (such as lime) to the water body, but the effect is not obvious, and the addition of substances is also likely to cause negative effects, increasing the burden of water quality treatment in the system. At present, there is also a tower-type carbon dioxide removal device for circulating water systems, which uses the method of upper water entry and lower aeration to remove carbon dioxide, but due to structural limitations, the degassing efficiency is not stable enough and it is not easy to clean and maintain. Therefore, the creation of an efficient removal device for carbon dioxide in water bodies is a technical and equipment problem that needs to be solved in the current factory-scale recirculating aquaculture. It is of great significance to improve the water treatment level of recirculating aquaculture and reduce the waste of energy and water resources. Summary of the invention

[0004] In view of the above problems, the object of the present invention is to provide a carbon dioxide removal device for a circulating aquaculture system to achieve efficient removal of carbon dioxide in aquaculture water.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a carbon dioxide removal device for a circulating aquaculture system, comprising a tower body, an air guide unit, a flow guide structure, a filler unit, a pneumatic telescopic rod and a movable baffle, wherein the flow guide structure and the pneumatic telescopic rod are respectively arranged at the upper and lower parts of the inner side of the tower body, the flow guide structure is used for guiding the aquaculture water entering from the upper part of the tower body, the pneumatic telescopic rod is arranged at the bottom of the tower body, and the upper end of the pneumatic telescopic rod is connected with the movable baffle, the movable baffle is slidably matched with the inner wall of the tower body, a plurality of through holes are arranged on the movable baffle, and the filler unit is placed above the movable baffle; the pneumatic telescopic rod is a hollow structure, the air guide unit is used for providing an air source to the pneumatic telescopic rod, the air flow makes the pneumatic telescopic rod lift the movable baffle and the filler unit upward, and at the same time the air flow countercurrents with the aquaculture water diverted by the flow guide structure, so that the carbon dioxide in the aquaculture water is removed and discharged to the outside of the tower body.

[0006] The air guide unit includes an air guide pipe and a blower, wherein the blower is arranged at the top of the tower body, the air guide pipe is vertically arranged inside the tower body, and the lower end of the air guide pipe sequentially passes through the guide structure and the movable partition and is then placed inside the pneumatic telescopic rod, the upper end of the air guide pipe is connected to the blower, and the blower blows air into the pneumatic telescopic rod through the air guide pipe.

[0007] The lower end side wall of the air guide pipe is provided with a plurality of air guide pipe air holes.

[0008] The pneumatic telescopic rod comprises a pneumatic telescopic rod outer cavity and a pneumatic telescopic rod inner cavity that are slidably matched, wherein the lower end of the pneumatic telescopic rod outer cavity is fixedly connected to the tower body, and the upper end of the pneumatic telescopic rod inner cavity is fixedly connected to the movable partition, and the pneumatic telescopic rod inner cavity is provided with a top plate and a bottom plate, and the top plate and the bottom plate are respectively provided with an upper air hole of the pneumatic telescopic rod and a lower air hole of the pneumatic telescopic rod.

[0009] The packing unit includes a plurality of hollow spherical packings, and the hollow spherical packings are hollow structures.

[0010] The guide structure includes an upper baffle and a plurality of guide plates, wherein the upper baffle is fixedly connected to the inner wall of the tower body, the plurality of guide plates are arranged above the upper baffle at intervals along the circumferential direction, and two adjacent guide plates are arranged front and back along the radial direction.

[0011] The carbon dioxide removal device of the circulating aquaculture system also includes a backwashing device arranged on the outer side of the lower part of the tower body, and the backwashing device uses the water inside the tower body to self-circulate to flush the packing unit descending to the lower part of the tower body.

[0012] The backwashing device includes a backwashing water pump, a backwashing pipe and a one-way valve I, wherein the water inlet of the backwashing water pump is connected to the bottom of the tower body through the one-way valve I, and the water outlet of the backwashing water pump is connected to the side wall of the tower body through the backwashing pipe; a wastewater outlet is provided at the bottom of the tower body.

[0013] A water outlet is provided at the bottom of the tower body, and the water outlet is connected to the breeding pond through a one-way valve II and an outlet pipe. A row of water outlet holes is provided at the position where the outlet pipe enters the breeding pond along the tangent direction of the pond wall. The treated water enters the breeding pond along the tangent direction, which can drive the water body to move in a circumferential direction. A water pump is provided in the breeding pond, and the water pump is connected to the water inlet at the upper part of the tower body through an inlet pipe.

[0014] The carbon dioxide removal device of the circulating aquaculture system also includes a central control system and a carbon dioxide real-time monitoring probe. The carbon dioxide real-time monitoring probe is arranged in the aquaculture pond and connected to the central control system via a data cable. The central control system is used to control the water pump, backwash water pump and air guide unit.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention provides a carbon dioxide removal device for a circulating aquaculture system, which effectively reduces carbon dioxide in aquaculture water in the circulating aquaculture system and reduces the impact of excessively high carbon dioxide concentrations on the health of farmed fish; an automatic backwashing device is used to achieve automatic cleaning of hollow spherical fillers, thereby preventing the fillers from scaling due to long-term contact with organic matter dissolved in water, thereby affecting the degassing efficiency; and a pneumatic telescopic rod is used to achieve two working states of degassing and backwashing. During the backwashing stage, the telescopic rod is compressed, and the partition supporting the filler descends, so that less water is required for the cleaning process, further saving water. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the working state of a carbon dioxide removal device of a circulating aquaculture system of the present invention; Figure 2 This is a schematic structural diagram of a carbon dioxide removal device for a circulating aquaculture system according to the present invention; Figure 3 It is a structural schematic diagram of the flow guide structure in the present invention; Figure 4 It is a schematic diagram of the structure of the pneumatic telescopic rod in the degassed state in the present invention; Figure 5 It is a schematic diagram of the structure of the pneumatic telescopic rod in the backwashing state of the present invention; Figure 6 A schematic diagram of a degassing state of a carbon dioxide removal device in a circulating aquaculture system according to the present invention; Figure 7 A schematic diagram of a backwashing state of a carbon dioxide removal device in a circulating aquaculture system according to the present invention; Figure 8 This is a graph showing the experimental results of carbon dioxide removal in an embodiment of the present invention.

[0017] In the figure: 1-tower body; 2-water inlet; 3-air guide pipe; 4-blower; 5-exhaust port; 6-flow guide structure; 61-upper baffle; 62-flow guide plate; 63-water outlet of upper baffle; 7-hollow spherical filler; 8-pneumatic telescopic rod; 81-air hole of air guide pipe; 82-outer cavity of pneumatic telescopic rod; 83-inner cavity of pneumatic telescopic rod; 84-upper air hole of pneumatic telescopic rod; 85-lower air hole of pneumatic telescopic rod; 9-movable baffle; 10-backwashing device; 11-backwashing water pump; 12-backwashing pipeline; 13-wastewater outlet; 14-one-way valve I; 15-water outlet; 16-observation port; 17-central control system; 18-water inlet pipe; 19-water pump; 20-water outlet pipe; 21-water outlet hole of water outlet pipe; 22-carbon dioxide real-time monitoring probe; 23-data cable; 24-breeding pond; 25-base, 26-one-way valve II. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] See also Figures 1 to 7 As shown, the present invention provides a carbon dioxide removal device for a circulating aquaculture system, comprising a tower body 1, an air guide unit, a flow guide structure 6, a filler unit, a pneumatic telescopic rod 8 and a movable baffle 9, wherein the flow guide structure 6 and the pneumatic telescopic rod 8 are respectively arranged at the upper and lower parts of the inner side of the tower body 1, the flow guide structure 6 is used for guiding the aquaculture water entering from the upper part of the tower body 1, the pneumatic telescopic rod 8 is arranged at the bottom of the tower body 1, and the upper end of the pneumatic telescopic rod 8 is connected to the movable baffle 9, the movable baffle 9 is slidably matched with the inner wall of the tower body 1, a plurality of through holes are arranged on the movable baffle 9, and the filler unit is placed above the movable baffle 9; the pneumatic telescopic rod 8 is a hollow structure, the air guide unit is used for providing an air source to the pneumatic telescopic rod 8, the air flow causes the pneumatic telescopic rod 8 to lift the movable baffle 9 and the filler unit upward, and at the same time, the air flow and the aquaculture water diverted by the flow guide structure 6 are countercurrent in two phases, so that the carbon dioxide in the aquaculture water is removed and discharged to the outside of the tower body 1.

[0020] See also Figure 2 As shown, in the embodiment of the present invention, a water inlet 2 and an exhaust port 5 are provided at the top of the tower body 1, and an observation port 16 is provided on the middle side wall of the tower body 1. The packing unit includes a plurality of hollow spherical packings 7, and the hollow spherical packings 7 are hollow structures. After the aquaculture water droplets flow to the hollow spherical packings 7, they will be further broken up into small water droplets to increase the relative surface area interacting with the air blown in by the blower 4, and further improve the carbon dioxide removal rate.

[0021] See also Figure 3As shown, in the embodiment of the present invention, the guide structure 6 includes an upper baffle 61 and a plurality of guide plates 62, wherein the upper baffle 61 is fixedly connected to the inner wall of the tower body 1, and the plurality of guide plates 62 are arranged above the upper baffle 61 at intervals along the circumferential direction, and two adjacent guide plates 62 are arranged front and back along the radial direction. After the aquaculture water to be treated enters the upper cavity of the tower body 1 from the water inlet 2, it can be quickly and evenly spread out after passing through the guide structure 6, and drips into the middle cavity through the upper baffle water outlet hole 63 on the upper baffle 61, and the water to be treated becomes a string of small water droplets.

[0022] See also Figure 2 As shown, in an embodiment of the present invention, the air guide unit includes an air guide pipe 3 and a blower 4, wherein the blower 4 is arranged at the top of the tower body 1, the air guide pipe 3 is vertically arranged inside the tower body 1, and the lower end of the air guide pipe 3 passes through the guide structure 6 and the movable partition 9 in sequence and is then placed in the pneumatic telescopic rod 8, the upper end of the air guide pipe 3 is connected to the blower 4, and the blower 4 blows air into the pneumatic telescopic rod 8 through the air guide pipe 3.

[0023] Further, see Figure 4 As shown, the lower end of the air guide pipe 3 is in contact with the bottom of the tower body 1 , and a plurality of air guide pipe air holes 81 are provided on the side wall of the lower end of the air guide pipe 3 .

[0024] See also Figure 4 and Figure 5 As shown, in an embodiment of the present invention, the pneumatic telescopic rod 8 includes a pneumatic telescopic rod outer cavity 82 and a pneumatic telescopic rod inner cavity 83 that are slidably matched, wherein the lower end of the pneumatic telescopic rod outer cavity 82 is fixedly connected to the tower body 1, and the upper end of the pneumatic telescopic rod inner cavity 83 is fixedly connected to the movable partition 9, and the pneumatic telescopic rod inner cavity 83 is provided with a top plate and a bottom plate, and the top plate and the bottom plate are respectively provided with a pneumatic telescopic rod upper air hole 84 and a pneumatic telescopic rod lower air hole 85.

[0025] When working, the blower 4 will be placed at the top of the device, and air will be blown in from top to bottom through the connected air guide pipe 3, and enter the outer cavity 82 and the inner cavity 83 of the pneumatic telescopic rod through the air hole 81 of the air guide pipe at the lower end of the air guide pipe 3. After the inner cavity 83 of the pneumatic telescopic rod is lifted up, the air flow enters the degassing tower cavity above the movable partition 9 through the air hole 84 on the pneumatic telescopic rod, and is then discharged from the exhaust port 5 at the top; and the aquaculture water to be treated enters the tower body 1 from the water inlet 2, and drips evenly after passing through the guide structure 6 and the hollow spherical filler 7. Through the countercurrent of gas and water phases, the high concentration of carbon dioxide in the water will diffuse into the air with low concentration of carbon dioxide and finally be taken out of the tower body 1, thereby realizing the removal of carbon dioxide from the water body.

[0026] When the device is performing degassing operation, the blower 4 blows air into the air through the air pipe 3 to the air pressure telescopic rod 8, and the movable baffle 9 is lifted by the air pressure. The movable baffle 9 lifts the hollow spherical filler 7 off the water surface, so that it can play the water-breaking function.

[0027] See also Figure 1 As shown, based on the above embodiments, a carbon dioxide removal device for a circulating aquaculture system provided by the present invention also includes a backwashing device 10 arranged on the outer side of the lower part of the tower body 1. The backwashing device 10 uses the water inside the tower body 1 for self-circulation to flush the packing unit that descends to the lower part of the tower body 1.

[0028] See also Figure 2 and Figure 6 As shown, in the embodiment of the present invention, the backwash device 10 includes a backwash water pump 11, a backwash pipe 12 and a one-way valve I14, wherein the water inlet of the backwash water pump 11 is connected to the bottom of the tower body 1 through the one-way valve I14, and the water outlet of the backwash water pump 11 is connected to the side wall of the tower body 1 through the backwash pipe 12; a wastewater outlet 13 is provided at the bottom of the tower body 1, and the opening and closing of the wastewater outlet 13 is controlled by a valve.

[0029] When the device is backwashing, the top blower 4 stops working, so that the air pressure in the pipeline is reduced, the air pressure telescopic rod 8 drops, and the hollow spherical filler 7 is lifted and immersed in the water. At the same time, the external backwashing water pump 11 starts working, extracts the remaining treated water in the cavity of the tower body 1 and then flushes it into the cavity through the backwashing pipe 12, forming a small circulating water body. The flushed water drives the hollow spherical filler 7 to rotate in the cavity with tangential force, realizing the automatic cleaning function, and the sewage can be directly discharged from the device through the wastewater outlet 13.

[0030] Further, see Figure 1 As shown, the bottom of the tower body 1 is provided with a water outlet 15, which is connected to the culture pool 24 through a one-way valve II 26 and a water outlet pipe 20. A water pump 19 is provided in the culture pool 24, and the water pump 19 is connected to the water inlet 2 on the upper part of the tower body 1 through a water inlet pipe 18. The tower body 1 is set on the base 25, and the device as a whole is higher than the water surface of the culture pool 24. The treated water can flow by gravity potential energy and enter the culture pool 24 through the water outlet 15 and the water outlet pipe 20 to reduce energy consumption; at the same time, a row of water outlet holes 21 are opened at the part where the water outlet pipe 20 enters the culture pool 24 along the tangent direction of the pool wall. The treated water flows into the culture pool 24 by gravity and then enters by tangent, which can drive the water to move in one direction, which is more conducive to the collection and discharge of sewage in the culture pool of the circulating water system.

[0031] When the device is backwashed, the one-way valve II 26 is closed and the one-way valve I 14 is opened. The water retained in the cavity is only used for backwashing, and then the sewage is discharged from the wastewater outlet 13 without entering the culture pond 24. When the degassing is working, the one-way valve I 14 is closed and the one-way valve II 26 is opened. The treated water flows back to the culture pond 24 through the one-way valve II 26.

[0032] Furthermore, the water inlet 2 of the tower body 1 can also be located below the water level of the breeding pond 24, so that the water to be treated can flow into the tower body 1 by gravity potential energy to reduce energy consumption and flexibly select the usage method according to actual conditions.

[0033] See also Figure 1 As shown, on the basis of the above embodiments, a carbon dioxide removal device for a circulating aquaculture system provided by the present invention also includes a central control system 17 and a carbon dioxide real-time monitoring probe 22. The carbon dioxide real-time monitoring probe 22 is arranged in the aquaculture pond 24 and is connected to the central control system 17 through a data cable 23. The central control system 17 is used to control the water pump 19, the backwash water pump 11 and the air guide unit.

[0034] Specifically, the carbon dioxide real-time monitoring probe 22, the water pump 19, the blower 4 and the backwash water pump 11 are all connected to the central control system 17 by the data cable 23. The central control system 17 can adjust the water flow of the water pump 19 and the wind force of the blower 4 in real time through the real-time change data of carbon dioxide in the aquaculture pond water body transmitted by the carbon dioxide real-time monitoring probe 22 to ensure that the degassing tower can maintain the best degassing efficiency. At the same time, the central control system 17 is also connected to the backwash device 10. After stopping working in the degassing stage, the backwash device 10 is automatically turned on, the water outlet 15 is closed through the one-way valve II 26, and the one-way valve I 14 is opened to realize fully intelligent degassing adjustment and backwashing work.

[0035] The present invention provides a carbon dioxide removal device for a circulating aquaculture system, and its working principle is: The degassing state driven by the blower 4 and the backwashing state driven by the backwashing device 10 are controlled by two sets of independent switches, and the pneumatic telescopic rod 8 is at different positions in the two working states.

[0036] See also Figure 6 As shown, in the degassing state, the air blown in by the blower 4 drives the pneumatic telescopic rod 8 to rise, and the connected movable partition 9 lifts the hollow spherical filler 7 off the water surface, so that it can play the water-breaking function and further enhance the carbon dioxide removal effect.

[0037] See also Figure 7 As shown, in the backwash state, the blower 4 stops working, the pneumatic telescopic rod 8 descends to hold the hollow spherical filler 7 and immerses it in the water, and at the same time the external backwash water pump 11 starts working, extracts the remaining treated water in the cavity of the tower body 1 and then flushes it into the cavity through the backwash pipe 12, forming a small circulating water body. The flushed water drives the hollow spherical filler 7 to rotate in the cavity of the tower body 1 with a tangential force, realizing the automatic cleaning function, preventing the filler from scaling, and extending the service life. The sewage can be directly discharged from the tower body 1 through the wastewater outlet 13.

[0038] Furthermore, the central control system 17 uses the real-time data of carbon dioxide changes in the water of the aquaculture pond transmitted by the real-time carbon dioxide monitoring probe 22 to adjust the water flow of the water pump 19 and the wind force of the blower 4 in real time to ensure that the degassing tower can maintain the best degassing efficiency. At the same time, it is also connected to the backwashing device 10. After the degassing stage stops working, the backwashing device 10 is automatically turned on and the water outlet 15 is closed through the one-way valve II 26, realizing fully intelligent degassing adjustment and backwashing work.

[0039] The present invention removes carbon dioxide from water by adopting a gas-water two-phase countercurrent method. When aquaculture water with a high carbon dioxide partial pressure passes through air with a low carbon dioxide partial pressure, the carbon dioxide in the water will leave the water due to the pressure difference and be carried out with the air, thereby achieving the removal of carbon dioxide from the water. Secondly, the water-breaking effect of the guide structure 6 and the hollow spherical filler 7 will cause the water flow to become a series of small water droplets, further increasing the surface area of ​​the gas-liquid two-phase interaction and improving the removal efficiency. At the same time, a backwashing device 10 is added to effectively enhance the self-maintenance function of the device, and at the same time, the pneumatic telescopic rod 8 is cleverly combined to further reduce the backwashing water consumption and reduce energy and resource consumption. The "plug and play" carbon dioxide removal device can also better meet the aquaculture needs of multiple scenarios, ensure the healthy growth and development of fish under good water quality, and improve the efficiency of factory aquaculture. Example

[0040] The degassing experiment of the device model was carried out in the Aquatic Museum of Ocean University of China. Carbon dioxide gas was filled into the tail water of turbot aquaculture to simulate the tail water with high carbon dioxide concentration for testing, and the removal efficiency of the device under different carbon dioxide concentrations was tested. The carbon dioxide in the water body before and after treatment was tested, and the experimental results are as follows: Figure 8 As shown, during the experiment, the water inlet speed of the device was 4000L / h, the wind force was 12L / s, the carbon dioxide concentration (mg / L) before removal was 76.62±0.43 in experiment 1, and 35.85±2.02 after removal, and the removal rate (%) was 53.22±0.02; in experiment 2, the carbon dioxide concentration (mg / L) before removal was 47.11±0.95, and the carbon dioxide concentration (mg / L) after removal was 22.64±0.71, and the removal rate (%) ) is 51.92±0.02; the carbon dioxide concentration (mg / L) before removal in experiment 3 is 24.04±1.22, the carbon dioxide concentration (mg / L) after removal is 10.25±0.88, and the removal rate (%) is 57.41±0.02; the carbon dioxide concentration (mg / L) before removal in experiment 4 is 9.06±0.50, the carbon dioxide concentration (mg / L) after removal is 4.42±0.15, and the removal rate (%) is 51.19±0.01. In the experimental stage, the carbon dioxide removal rate of the device for water bodies can reach more than 50%, and the removal effect is good.

[0041] The present invention provides a carbon dioxide removal device for a circulating aquaculture system, which has created an efficient removal technology for carbon dioxide in water under a factory-scale circulating aquaculture mode, and can monitor the carbon dioxide concentration in the aquaculture pond in real time and adjust the blower and water pump of the degassing tower through a central control system to achieve efficient removal of carbon dioxide from the aquaculture pond water. The device has the functions of removing carbon dioxide from the aquaculture water and backwashing the device, which can effectively reduce the excessive accumulation of carbon dioxide in the water produced by the respiratory metabolism of intensively cultured fish, avoid the difficulty of oxygenation caused by excessive carbon dioxide partial pressure, avoid the phenomenon of acidification of the aquaculture water in the circulating water system, reduce the negative impact of high concentration of carbon dioxide in the water on the growth and development and physiological health of fish, and further increase the output of factory-scale aquaculture. The present invention adopts a backwashing device driven by a water pump, which can clean the internal filler of the device to extend its service life. At the same time, it cleverly uses the pneumatic telescopic rod to reduce the water consumption in the backwashing process, reduce maintenance costs, and reduce water resource waste. It adopts a plug-and-play design to meet the practical needs of land-based factory farming, farming ships and even long-distance transportation of live fish, effectively reduce the carbon dioxide content in the water, ensure the healthy growth and development of fish in a high-density farming environment, and further increase the output of aquaculture.

[0042] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A carbon dioxide removal device for a circulating aquaculture system, characterized in that: The invention comprises a tower body (1), an air guide unit, a flow guide structure (6), a filler unit, a pneumatic telescopic rod (8) and a movable baffle (9), wherein the flow guide structure (6) and the pneumatic telescopic rod (8) are respectively arranged at the upper and lower parts of the inner side of the tower body (1), the flow guide structure (6) is used to guide the aquaculture water entering from the upper part of the tower body (1), the pneumatic telescopic rod (8) is arranged at the bottom of the tower body (1), and the upper end of the pneumatic telescopic rod (8) is connected to the movable baffle (9), and the movable baffle (9) is connected to the tower body (1). The inner wall of the tower body (1) is slidably matched, a plurality of through holes are provided on the movable baffle (9), and a filler unit is placed above the movable baffle (9); the pneumatic telescopic rod (8) is a hollow structure, and the air guide unit is used to provide an air source to the pneumatic telescopic rod (8), so that the air flow causes the pneumatic telescopic rod (8) to lift the movable baffle (9) and the filler unit upwards, and at the same time, the air flow countercurrently flows with the aquaculture water diverted by the guide structure (6), so that the carbon dioxide in the aquaculture water is removed and discharged to the outside of the tower body (1).

2. The carbon dioxide removal device of the circulating aquaculture system according to claim 1, characterized in that: The air guide unit comprises an air guide pipe (3) and a blower (4), wherein the blower (4) is arranged at the top of the tower body (1), the air guide pipe (3) is vertically arranged inside the tower body (1), and the lower end of the air guide pipe (3) passes through the flow guide structure (6) and the movable partition (9) in sequence and is then arranged inside the pneumatic telescopic rod (8), the upper end of the air guide pipe (3) is connected to the blower (4), and the blower (4) blows air into the pneumatic telescopic rod (8) through the air guide pipe (3).

3. The carbon dioxide removal device of the circulating aquaculture system according to claim 2 is characterized in that: A plurality of air guide tube air holes (81) are provided on the side wall of the lower end of the air guide tube (3).

4. The carbon dioxide removal device of the circulating aquaculture system according to claim 1, characterized in that: The pneumatic telescopic rod (8) comprises a pneumatic telescopic rod outer cavity (82) and a pneumatic telescopic rod inner cavity (83) that are slidably matched, wherein the lower end of the pneumatic telescopic rod outer cavity (82) is fixedly connected to the tower body (1), and the upper end of the pneumatic telescopic rod inner cavity (83) is fixedly connected to the movable partition (9), and the pneumatic telescopic rod inner cavity (83) is provided with a top plate and a bottom plate, and the top plate and the bottom plate are respectively provided with a pneumatic telescopic rod upper air hole (84) and a pneumatic telescopic rod lower air hole (85).

5. The carbon dioxide removal device of the circulating aquaculture system according to claim 1, characterized in that: The packing unit comprises a plurality of hollow spherical packings (7), and the hollow spherical packings (7) are of a hollow structure.

6. The carbon dioxide removal device of the circulating aquaculture system according to claim 1, characterized in that: The guide structure (6) comprises an upper baffle (61) and a plurality of guide plates (62), wherein the upper baffle (61) is fixedly connected to the inner wall of the tower body (1), and the plurality of guide plates (62) are arranged above the upper baffle (61) at intervals along the circumferential direction, and two adjacent guide plates (62) are arranged front and back along the radial direction.

7. The carbon dioxide removal device of the circulating aquaculture system according to claim 1, characterized in that: It also comprises a backwashing device (10) arranged on the outer side of the lower part of the tower body (1), wherein the backwashing device (10) utilizes the water inside the tower body (1) to self-circulate so as to wash the packing unit descending to the lower part of the tower body (1).

8. The carbon dioxide removal device of the circulating aquaculture system according to claim 7, characterized in that: The backwashing device (10) comprises a backwashing water pump (11), a backwashing pipe (12) and a one-way valve I (14), wherein the water inlet of the backwashing water pump (11) is connected to the bottom of the tower body (1) through the one-way valve I (14), and the water outlet of the backwashing water pump (11) is connected to the side wall of the tower body (1) through the backwashing pipe (12); and a wastewater outlet (13) is provided at the bottom of the tower body (1).

9. The carbon dioxide removal device of the circulating aquaculture system according to claim 7, characterized in that: The bottom of the tower body (1) is provided with a water outlet (15), which is connected to the culture pond (24) through a one-way valve II (26) and a water outlet pipe (20). A water outlet hole (21) is provided at the part where the water outlet pipe (20) enters the culture pond (24) along the tangential direction of the pond wall. The treated water enters the culture pond (24) along the tangential direction, which can drive the water to move in a circumferential direction. A water pump (19) is provided in the culture pond (24), and the water pump (19) is connected to the water inlet (2) at the upper part of the tower body (1) through a water inlet pipe (18).

10. The carbon dioxide removal device of the circulating aquaculture system according to claim 9, characterized in that: It also includes a central control system (17) and a carbon dioxide real-time monitoring probe (22). The carbon dioxide real-time monitoring probe (22) is arranged in the breeding pond (24) and is connected to the central control system (17) via a data cable (23). The central control system (17) is used to control the water pump (19), the backwash water pump (11) and the air guide unit.

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