A carbon dioxide removal device for a recirculating aquaculture system

Abstract

The present invention belongs to the technical field of water treatment for industrialized aquaculture, and particularly relates to a carbon dioxide removal device for a recirculating aquaculture system. It includes a tower body, a gas guiding unit, a diversion structure, a packing unit, a pneumatic telescopic rod and a movable partition. The upper and lower parts of the tower body are respectively provided with a diversion structure and a pneumatic telescopic rod. The diversion structure is used for guiding the aquaculture water, and the pneumatic telescopic rod is arranged at the bottom of the tower body and connected to the movable partition. The packing unit is placed above the movable partition; the gas guiding unit is used to provide a gas source for the pneumatic telescopic rod. The airflow causes the pneumatic telescopic rod to lift the movable partition and the packing unit upward. At the same time, the airflow counterflows with the aquaculture water, removing the carbon dioxide in the aquaculture water and discharging it to the outside of the tower body. The present invention effectively reduces the excessive accumulation of carbon dioxide in the water body generated by the respiratory metabolism of intensively cultured fish, etc., avoids the phenomenon of water body acidification, and reduces the negative impact of high-concentration carbon dioxide in the water body on the growth and development and physiological health of fish.

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:

[0006] The present invention provides a carbon dioxide removal device for a recirculating aquaculture system, which includes a tower body, a gas guiding unit, a diversion structure, a packing unit, a pneumatic telescopic rod and a movable partition. Among them, the upper and lower parts of the inner side of the tower body are respectively provided with a diversion structure and a pneumatic telescopic rod. The diversion 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 to the movable partition. The movable partition is slidably matched with the inner wall of the tower body. A plurality of through holes are provided on the movable partition. The packing unit is placed above the movable partition. The pneumatic telescopic rod is of a hollow structure. The gas guiding unit is used to provide a gas source to the pneumatic telescopic rod. The airflow lifts the movable partition and the packing unit upward by the pneumatic telescopic rod. At the same time, the airflow counterflows with the aquaculture water diverted by the diversion structure, removes the carbon dioxide in the aquaculture water and discharges it to the outside of the tower body.

[0007] The gas guiding unit includes a gas guiding pipe and a blower. Among them, the blower is arranged on the top of the tower body. The gas guiding pipe is vertically arranged inside the tower body. The lower end of the gas guiding pipe sequentially passes through the diversion structure and the movable partition and is placed inside the pneumatic telescopic rod. The upper end of the gas guiding pipe is connected to the blower. The blower blows air into the pneumatic telescopic rod through the gas guiding pipe.

[0008] A plurality of gas guiding pipe air holes are provided on the side wall of the lower end of the gas guiding pipe.

[0009] The pneumatic telescopic rod includes a pneumatic telescopic rod outer cavity and a pneumatic telescopic rod inner cavity which are slidably matched. Among them, the lower end of the pneumatic telescopic rod outer cavity is fixedly connected to the tower body. The upper end of the pneumatic telescopic rod inner cavity is fixedly connected to the movable partition. The pneumatic telescopic rod inner cavity is provided with a top plate and a bottom plate, and a pneumatic telescopic rod upper air hole and a pneumatic telescopic rod lower air hole are respectively provided on the top plate and the bottom plate.

[0010] The packing unit includes a plurality of hollow spherical packings, and the hollow spherical packings are of a hollow structure.

[0011] The diversion structure includes an upper layer partition and a plurality of diversion plates. Among them, the upper layer partition is fixedly connected to the inner wall of the tower body. The plurality of diversion plates are arranged at intervals along the circumferential direction above the upper layer partition, and two adjacent diversion plates are arranged front and back along the radial direction.

[0012] The carbon dioxide removal device for the recirculating aquaculture system further includes an anti-flushing device arranged on the outer side of the lower part of the tower body. The anti-flushing device uses the water inside the tower body for self-circulation to flush the packing unit that has descended to the lower part of the tower body.

[0013] The anti-flushing device includes an anti-flushing water pump, an anti-flushing pipeline and a check valve I. Among them, the water inlet of the anti-flushing water pump is communicated with the bottom of the tower body through the check valve I. The water outlet of the anti-flushing water pump is connected to the side wall of the tower body through the anti-flushing pipeline. A waste water drain port is provided at the bottom of the tower body.

[0014] The bottom of the tower body is provided with a water outlet, which is connected to the aquaculture pond through a one-way valve II and a water outlet pipe. The part of the water outlet pipe entering the aquaculture pond is provided with a row of water outlet holes of the water outlet pipe along the tangential direction of the pond wall. The treated water body enters the aquaculture pond tangentially, which can drive the water body to move circumferentially. A water pump is arranged in the aquaculture pond, and the water pump is connected to the water inlet at the upper part of the tower body through a water inlet pipe.

[0015] The carbon dioxide removal device of the circulating water aquaculture system further 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 is connected to the central control system through a data cable. The central control system is used to control the water pump, the backwashing water pump and the gas guiding unit.

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

[0017] The carbon dioxide removal device of the circulating water aquaculture system provided by the present invention effectively reduces the carbon dioxide in the aquaculture water body in the circulating water aquaculture system, and reduces the impact of too high concentration of carbon dioxide on the health of cultured fish; the automatic backwashing device is used to realize the automatic cleaning of the hollow spherical packing, avoiding the scaling of the packing due to long-term contact with the organic matter dissolved in the water, thus affecting the degassing efficiency; and the air pressure telescopic rod is used to realize two working states of degassing and backwashing. During the backwashing stage, the telescopic rod is compressed, and the partition supporting the packing descends, so that less water is required for the cleaning process, further saving water consumption. Description of the drawings

[0018] Figure 1 It is a schematic diagram of the working state of the carbon dioxide removal device of the circulating water aquaculture system of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the carbon dioxide removal device of the circulating water aquaculture system of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the diversion structure in the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the air pressure telescopic rod in the degassing state in the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the air pressure telescopic rod in the backwashing state in the present invention;

[0023] Figure 6 It is a schematic diagram of the degassing state of the carbon dioxide removal device of the circulating water aquaculture system of the present invention;

[0024] Figure 7 It is a schematic diagram of the backwashing state of the carbon dioxide removal device of the circulating water aquaculture system of the present invention;

[0025] Figure 8 This is the experimental result graph of carbon dioxide removal in the embodiment of the present invention.

[0026] In the figure: 1 - tower body; 2 - water inlet; 3 - gas guide pipe; 4 - blower; 5 - exhaust port; 6 - diversion structure; 61 - upper partition board; 62 - diversion board; 63 - water outlet hole of the upper partition board; 7 - hollow spherical packing; 8 - pneumatic telescopic rod; 81 - air hole of the gas guide pipe; 82 - outer cavity of the pneumatic telescopic rod; 83 - inner cavity of the pneumatic telescopic rod; 84 - upper air hole of the pneumatic telescopic rod; 85 - lower air hole of the pneumatic telescopic rod; 9 - movable partition board; 10 - backwashing device; 11 - backwashing water pump; 12 - backwashing pipeline; 13 - waste water drain port; 14 - check 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 the water outlet pipe; 22 - carbon dioxide real-time monitoring probe; 23 - data cable; 24 - aquaculture pond; 25 - base, 26 - check valve II. Specific embodiments

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] See Figures 1 to 7 As shown, the present invention provides a carbon dioxide removal device for a circulating water aquaculture system, including a tower body 1, a gas guiding unit, a diversion structure 6, a packing unit, a pneumatic telescopic rod 8 and a movable partition board 9. Among them, the diversion structure 6 and the pneumatic telescopic rod 8 are respectively arranged on the upper and lower inner sides of the tower body 1. The diversion 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 partition board 9. The movable partition board 9 is slidably matched with the inner wall of the tower body 1. The movable partition board 9 is provided with a plurality of through holes, and the packing unit is placed above the movable partition board 9; the pneumatic telescopic rod 8 is a hollow structure, and the gas guiding unit is used to provide a gas source for the pneumatic telescopic rod 8. The air flow makes the pneumatic telescopic rod 8 lift the movable partition board 9 and the packing unit upward. At the same time, the air flow and the aquaculture water diverted by the diversion structure 6 perform two-phase countercurrent flow, removing the carbon dioxide in the aquaculture water and discharging it to the outside of the tower body 1.

[0029] See Figure 2 As shown in the embodiment of the present invention, the top of the tower body 1 is provided with a water inlet 2 and an exhaust port 5, and an observation port 16 is opened 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 of a hollow structure. After the aquaculture water drips onto the hollow spherical packings 7, it will be further broken up into small water droplets to increase the relative surface area of interaction with the air blown by the blower 4, and further improve the carbon dioxide removal rate.

[0030] SeeFigure 3 As shown in the figure, in an embodiment of the present invention, the diversion structure 6 includes an upper partition plate 61 and a plurality of diversion plates 62. The upper partition plate 61 is fixedly connected to the inner wall of the tower body 1, and the plurality of diversion plates 62 are arranged at intervals in the circumferential direction above the upper partition plate 61, and two adjacent diversion plates 62 are arranged front and back in the radial direction. After the water to be treated for aquaculture enters the upper cavity of the tower body 1 from the water inlet 2, it can spread quickly and evenly after passing through the diversion structure 6, and then drip to the middle cavity through the upper partition plate water outlet holes 63 on the upper partition plate 61. At this time, the water to be treated becomes a series of small water droplets.

[0031] See Figure 2 As shown in the figure, in an embodiment of the present invention, the air guiding unit includes an air guiding pipe 3 and a blower 4. The blower 4 is arranged at the top of the tower body 1, the air guiding pipe 3 is vertically arranged inside the tower body 1, and the lower end of the air guiding pipe 3 sequentially penetrates through the diversion structure 6 and the movable partition plate 9 and is placed inside the pneumatic telescopic rod 8. The upper end of the air guiding pipe 3 is connected to the blower 4, and the blower 4 blows air into the pneumatic telescopic rod 8 through the air guiding pipe 3.

[0032] Further, see Figure 4 As shown in the figure, the lower end of the air guiding pipe 3 abuts against the bottom of the tower body 1, and a plurality of air guiding pipe air holes 81 are provided on the side wall of the lower end of the air guiding pipe 3.

[0033] See Figure 4 and Figure 5 As shown in the figure, 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. The lower end of the pneumatic telescopic rod outer cavity 82 is fixedly connected to the tower body 1, the upper end of the pneumatic telescopic rod inner cavity 83 is fixedly connected to the movable partition plate 9, the pneumatic telescopic rod inner cavity 83 is provided with a top plate and a bottom plate, and a pneumatic telescopic rod upper air hole 84 and a pneumatic telescopic rod lower air hole 85 are respectively provided on the top plate and the bottom plate.

[0034] During operation, the blower 4 is placed at the topmost end of the device, and air is blown from top to bottom through the connected air guiding pipe 3. The air enters the pneumatic telescopic rod outer cavity 82 and the pneumatic telescopic rod inner cavity 83 through the air guiding pipe air holes 81 at the lower end of the air guiding pipe 3. After the pneumatic telescopic rod inner cavity 83 is lifted, the air flow enters the degassing tower cavity above the movable partition plate 9 through the pneumatic telescopic rod upper air hole 84 and is then discharged from the exhaust port 5 at the top; while the water to be treated for aquaculture enters the tower body 1 from the water inlet 2, and after passing through the diversion structure 6 and the hollow spherical packing 7, it drips evenly. Through the countercurrent of gas and water, the high-concentration carbon dioxide in the water will diffuse into the air with low-concentration carbon dioxide and finally be taken out of the tower body 1, realizing the removal of carbon dioxide in the water body.

[0035] When the device performs degassing work, the blower 4 blows air, which passes through the air guiding pipe 3 to the pneumatic telescopic rod 8. The movable partition plate 9 is lifted by the air pressure, and the movable partition plate 9 holds the hollow spherical packing 7 away from the water surface, enabling it to perform the function of breaking water.

[0036] See Figure 1 As shown, on the basis of the above embodiments, a carbon dioxide removal device for a recirculating aquaculture system provided by the present invention further includes a backwashing device 10 disposed outside the lower part of the tower body 1. The backwashing device 10 uses the water inside the tower body 1 for self-circulation to wash the packing unit that has descended to the lower part of the tower body 1.

[0037] See Figure 2 and Figure 6 As shown, in the embodiment of the present invention, the backwashing device 10 includes a backwashing water pump 11, a backwashing pipeline 12, and a check valve I 14. The water inlet of the backwashing water pump 11 is communicated with the bottom of the tower body 1 through the check 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 pipeline 12; a wastewater drain port 13 is provided at the bottom of the tower body 1, and the wastewater drain port 13 is controlled to open and close by a valve.

[0038] When the device is backwashed, the top blower 4 stops working, causing the pipeline air pressure to decrease, the pneumatic telescopic rod 8 to descend, and the hollow spherical packing 7 to be immersed in water. At the same time, the external backwashing water pump 11 starts to work, pumping the remaining treated water body in the cavity of the tower body 1 through the backwashing pipeline 12 and then flushing it back into the cavity to form a small circulating water body. The flushing water body drives the hollow spherical packing 7 to rotate in the cavity with tangential force to achieve the automatic sewage cleaning function, and the sewage can be directly discharged from the wastewater drain port 13.

[0039] Further, see Figure 1 As shown, a water outlet 15 is provided at the bottom of the tower body 1. The water outlet 15 is communicated with the aquaculture pond 24 through a check valve II 26 and a water outlet pipe 20. A water pump 19 is provided in the aquaculture 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. The tower body 1 is disposed on a base 25, and the whole device is higher than the water surface of the aquaculture pond 24. The treated water can flow by gravity potential energy, enter the aquaculture pond 24 from the water outlet 15 through the water outlet pipe 20 to reduce energy consumption; at the same time, a water outlet hole 21 for discharging the water from the water outlet pipe is provided along the tangential direction of the pool wall at the part where the water outlet pipe 20 enters the aquaculture pond 24. After the treated water body flows into the aquaculture pond 24 by self-flow, it enters tangentially, which can drive the water body to move in one direction, and is more conducive to the sewage collection and discharge of the aquaculture pond in the circulating water system.

[0040] When the device is backwashed, the check valve II 26 is closed and the check valve I 14 is opened. The water remaining in the cavity is only used for backwashing, and then the sewage is discharged from the wastewater drain port 13 and does not enter the aquaculture pond 24. During the degassing operation, the check valve I 14 is closed and the check valve II 26 is opened, and the treated water body flows back into the aquaculture pond 24 through the check valve II 26.

[0041] Further, the water inlet 2 of the tower body 1 can also be located below the water level of the aquaculture pond 24, enabling the water to be treated to flow into the tower body 1 by gravity potential energy, so as to reduce energy consumption and flexibly select the usage mode according to the actual situation.

[0042] See Figure 1 As shown, on the basis of the above embodiment, a carbon dioxide removal device for a recirculating aquaculture system provided by the present invention further 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 gas guiding unit.

[0043] 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 through the data cable 23. The central control system 17 can adjust the pumping flow rate of the water pump 19 and the wind force of the blower 4 in real time according to the real-time change data of carbon dioxide in the water body of the aquaculture pond transmitted by the carbon dioxide real-time monitoring probe 22, so as 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 the degassing stage stops working, 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.

[0044] The working principle of a carbon dioxide removal device for a recirculating aquaculture system provided by the present invention is as follows:

[0045] The degassing state driven by the blower 4 and the backwash state driven by the backwash device 10 are controlled by two sets of independent switches, and the pneumatic telescopic rod 8 is in different positions in both working states.

[0046] See Figure 6 As shown, in the degassing state, the air blown in by the blower 4 drives the pneumatic telescopic rod 8 to lift, and the connected movable partition 9 holds the hollow spherical packing 7 above the water surface, enabling it to play a water-breaking function and further enhancing the carbon dioxide removal effect.

[0047] See Figure 7 As shown, in the backwash state, the blower 4 stops working, the pneumatic telescopic rod 8 descends to hold the hollow spherical packing 7 immersed in the water, and at the same time the external backwash water pump 11 starts to work, pumping the remaining treated water in the cavity of the tower body 1 through the backwash pipeline 12 and then flushing it into the cavity to form a small circulating water body. The flushing water body drives the hollow spherical packing 7 to rotate in the cavity of the tower body 1 with tangential force, realizing the automatic cleaning function, preventing the packing from scaling, prolonging the service life, and the sewage can be directly discharged from the waste water drain 13 of the tower body 1.

[0048] Furthermore, the central control system 17 adjusts the pumping flow rate of the water pump 19 and the wind force of the blower 4 in real time according to the real-time change data of carbon dioxide in the aquaculture pond water transmitted by the carbon dioxide real-time monitoring probe 22, so as 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.

[0049] The present invention removes carbon dioxide in water by adopting a countercurrent mode of gas and water phases. When the aquaculture water with a high carbon dioxide partial pressure passes through the air with a low carbon dioxide partial pressure, the carbon dioxide in the water will escape from the water body due to the pressure difference and be carried out with the air, thus realizing the removal of carbon dioxide in the water body. Secondly, the water-breaking effect of the diversion structure 6 and the hollow spherical packing 7 will make the water flow into a series of small water droplets, further increasing the surface area of the interaction between the gas and liquid phases and improving the removal efficiency. At the same time, a backwashing device 10 is added, effectively enhancing the self-maintenance function of the device. At the same time, the pneumatic telescopic rod 8 is skillfully combined to further reduce the backwashing water consumption and reduce energy and resource consumption. The "plug and play" carbon dioxide removal device can better meet the aquaculture needs of multiple scenarios, ensure the healthy growth and development of fish in good water quality, and improve the efficiency of industrial aquaculture. Embodiment

[0050] A degassing experiment on the device model was carried out in the Aquarium of Ocean University of China. Carbon dioxide gas was filled into the culture tail water of turbot to simulate the culture tail water with a high carbon dioxide concentration for testing, and the removal efficiency of this device at different carbon dioxide concentrations was tested. The carbon dioxide in the water before and after treatment was detected, and the experimental results are as Figure 8 shown. During the experiment, the water inlet speed of the device was 4000 L / h and the wind force was 12 L / s. In Experiment 1, the carbon dioxide concentration (mg / L) before removal was 76.62 ± 0.43, and after removal was 35.85 ± 2.02, 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 (%) was 51.92 ± 0.02; in Experiment 3, the carbon dioxide concentration (mg / L) before removal was 24.04 ± 1.22, and the carbon dioxide concentration (mg / L) after removal was 10.25 ± 0.88, and the removal rate (%) was 57.41 ± 0.02; in Experiment 4, the carbon dioxide concentration (mg / L) before removal was 9.06 ± 0.50, and the carbon dioxide concentration (mg / L) after removal was 4.42 ± 0.15, and the removal rate (%) was 51.19 ± 0.01. During the experimental stage, the removal rate of carbon dioxide in the water by the device can reach more than 50%, and the removal effect is good.

[0051] A carbon dioxide removal device for a recirculating aquaculture system provided by the present invention has established an efficient carbon dioxide removal technology for water bodies in the factory recirculating aquaculture mode. It 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 the central control system to achieve efficient removal of carbon dioxide from the water body of the aquaculture pond. This device has the functions of removing carbon dioxide from the aquaculture water body and backwashing the device, which can effectively reduce the excessive accumulation of carbon dioxide in the water body generated by the respiratory metabolism of intensively cultured fish, etc., avoid the difficulty of oxygenation caused by too high carbon dioxide partial pressure, prevent the acidification of the aquaculture water body in the recirculating water system, reduce the negative impact of high-concentration carbon dioxide in the water body on the growth, development and physiological health of fish, and further improve the output of factory aquaculture. The present invention adopts a backwashing device driven by a water pump, which can clean the internal packing of the device to extend its service life. At the same time, it cleverly uses a pneumatic telescopic rod to reduce the water consumption during the backwashing process, reduce the maintenance cost and water resource waste; it adopts a plug-and-play design to meet the practical needs of land-based factory aquaculture, aquaculture vessels and even long-distance live fish transportation, etc., efficiently reduce the carbon dioxide content in the water body, ensure the healthy growth and development of fish in a high-density aquaculture environment, and further improve the output of aquaculture.

[0052] The above are only the embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, expansions, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A carbon dioxide removal device for a recirculating aquaculture system, characterized in that, It includes a tower body, a gas guiding unit, a diversion structure, a packing unit, a pneumatic telescopic rod and a movable partition. Among them, the diversion structure and the pneumatic telescopic rod are respectively arranged on the upper and lower parts of the inner side of the tower body. The diversion 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 to the movable partition. The movable partition is slidably matched with the inner wall of the tower body. A plurality of through holes are provided on the movable partition. The packing unit is placed above the movable partition. The pneumatic telescopic rod is of a hollow structure. The gas guiding unit is used to provide a gas source for the pneumatic telescopic rod. The airflow lifts the movable partition and the packing unit upward by the pneumatic telescopic rod. At the same time, the airflow counterflows with the aquaculture water diverted by the diversion structure to remove carbon dioxide in the aquaculture water and discharge it to the outside of the tower body. The pneumatic telescopic rod includes a pneumatic telescopic rod outer cavity and a pneumatic telescopic rod inner cavity that are slidably matched. Among them, 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. The pneumatic telescopic rod inner cavity is provided with a top plate and a bottom plate, and a pneumatic telescopic rod upper air hole and a pneumatic telescopic rod lower air hole are respectively provided on the top plate and the bottom plate. The packing unit includes a plurality of hollow spherical packings, and the hollow spherical packings are of a hollow structure. The diversion structure includes an upper partition and a plurality of diversion plates. Among them, the upper partition is fixedly connected to the inner wall of the tower body, and the plurality of diversion plates are arranged at intervals along the circumferential direction above the upper partition, and two adjacent diversion plates are arranged front and back in the radial direction. The gas guiding unit includes a gas guiding pipe and a blower. Among them, the blower is arranged at the top of the tower body. The gas guiding pipe is vertically arranged inside the tower body, and the lower end of the gas guiding pipe sequentially passes through the diversion structure and the movable partition and then is placed inside the pneumatic telescopic rod. The upper end of the gas guiding pipe is connected to the blower, and the blower blows air into the pneumatic telescopic rod through the gas guiding pipe. A plurality of gas guiding pipe air holes are provided on the side wall of the lower end of the gas guiding pipe. When the device performs degassing work, the air blown in by the gas guiding unit enters the pneumatic telescopic rod. The movable partition is lifted by the air pressure. The movable partition holds the hollow spherical packing and lifts it off the water surface, enabling it to perform the function of breaking water. The carbon dioxide removal device of the circulating aquaculture system further includes an anti-flushing device arranged on the outer side of the lower part of the tower body. The anti-flushing device uses the water inside the tower body for self-circulation to flush the packing unit that has descended to the lower part of the tower body.

2. The carbon dioxide removal device of the recirculating aquaculture system according to claim 1, characterized in that, The anti-flushing device includes an anti-flushing water pump, an anti-flushing pipeline and a check valve Ⅰ. Among them, the water inlet of the anti-flushing water pump is communicated with the bottom of the tower body through the check valve Ⅰ, and the water outlet of the anti-flushing water pump is connected to the side wall of the tower body through the anti-flushing pipeline. A waste water drain port is provided at the bottom of the tower body.

3. The carbon dioxide removal device of the recirculating aquaculture system according to claim 1, wherein, A water outlet is provided at the bottom of the tower body. The water outlet is communicated with the aquaculture pond through a check valve Ⅱ and a water outlet pipe. A water outlet hole for discharging the water outlet pipe is opened at the part where the water outlet pipe enters the aquaculture pond along the tangential direction of the pond wall. The treated water enters the aquaculture pond tangentially and can drive the water body to move circumferentially. A water pump is provided in the aquaculture pond, and the water pump is connected to the water inlet of the upper part of the tower body through a water inlet pipe.

4. The carbon dioxide removal device of the recirculating aquaculture system according to claim 3, characterized in that, It 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 is connected to the central control system through a data cable. The central control system is used to control the water pump, the backwash water pump and the gas guiding unit.

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