Carbon dioxide inflation device for spirulina cultivation

Abstract

According to the carbon dioxide inflation device for spirulina cultivation, a carbon storage tank sends carbon dioxide into a cultivation pond through a short pipe, the conveying distance can be effectively shortened, and the carbon dioxide supplement acceleration rate can be accurately controlled by controlling a switch of an electric stop valve and adjusting the opening degree of the valve; after carbon dioxide uniformly enters the culture pond from the short pipe, the gas-liquid contact area can be increased through the bubble refining device, the utilization rate of the carbon dioxide is improved, and for the carbon dioxide escaping from the culture pond, the bottom edge of a greenhouse film can be pressed in the water seal tank through the cooperation of the water seal tank and the pressing assembly to form a sealing cover. The escaped carbon dioxide located on the lower layer of the gas is further absorbed and utilized by the spirulina, the pH value of the culture solution is monitored in real time through the pH detector, automatic supplement of the carbon dioxide can be achieved in the spirulina culture process in cooperation with the electric stop valve, and it is guaranteed that the pH value of the culture solution is always kept within the stable range suitable for spirulina growth.

Description

Technical Field

[0001] The utility model relates to the technical field of spirulina cultivation equipment, in particular to a carbon dioxide inflation device for spirulina cultivation. Background Art

[0002] Spirulina can absorb carbon dioxide through photosynthesis and convert it into a carbon source for its own growth and reproduction. During the cultivation of spirulina, the carbon dioxide content in the spirulina culture solution can be controlled by artificial ventilation or carbon dioxide gas injection to meet the growth requirements of spirulina. When the replenishment rate of carbon dioxide is greater than the consumption rate of spirulina photosynthesis, excessive carbon dioxide in the culture solution will cause the H+ concentration to increase and the pH value to continuously decrease. An excessively low pH value will inhibit the growth of spirulina. On the contrary, when the replenishment rate of carbon dioxide is less than the consumption rate of spirulina photosynthesis, the algal cells will use HCO3- in the culture solution as a carbon source, resulting in an increase in the pH value of the culture solution. To maintain the pH value of the culture solution within a stable range suitable for the growth of spirulina, it is necessary to precisely control the replenishment rate of carbon dioxide.

[0003] Moreover, at present, the dissolution rate of carbon dioxide in the culture solution is low, resulting in a too low absorption rate of carbon dioxide by spirulina and causing a large amount of carbon dioxide waste. To make carbon dioxide dissolve evenly in the culture solution and thus improve the absorption rate of spirulina, carbon dioxide gas is generally sent into different areas of the cultivation pond through multiple pipelines. The carbon dioxide addition path is long, and it is difficult to accurately control the replenishment rate of carbon dioxide in each area. If an electric stop valve is set on each pipeline, the control of the carbon dioxide replenishment rate will be relatively complex, lack reliability, the electric stop valve is prone to failure, the maintenance cost is high and it is not convenient for maintenance. The long-distance transportation also makes the carbon dioxide addition operation execution time long, and it is difficult to ensure that the pH value of the culture solution is within a stable range suitable for the growth of spirulina. Therefore, there is an urgent need for a carbon dioxide inflation device that can dynamically and accurately control the replenishment rate according to the carbon dioxide consumption rate while improving the utilization rate of added carbon dioxide. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a carbon dioxide inflation device for spirulina cultivation to solve the problems that the carbon dioxide inflation device in the existing column or pipeline cultivation mode occupies the internal space of the column or pipeline, affects the yield of spirulina, and is not convenient for fine control of the carbon dioxide addition rate.

[0005] To solve the above technical problems, the present utility model provides a carbon dioxide inflation device for spirulina cultivation, which includes a cultivation pond and an inflation chamber located below the cultivation pond. A carbon storage tank is fixed at the bottom of the inflation chamber. The carbon storage tank is connected to the bottom side of the cultivation pond through a plurality of short pipes evenly distributed. Bubble atomizers are installed at the air outlets of the short pipes. The bubble atomizers are located at the inner bottom side of the cultivation pond. An electric stop valve is provided at the connection between the carbon storage tank and the short pipes. A water seal groove is fixed on the outer periphery of the top of the cultivation pond. A pressing component is provided at the bottom of the water seal groove. An installation frame is erected above the cultivation pond. The bottom of the installation frame is fixed in the water seal groove. A shed film is installed on the installation frame. The bottom edge of the shed film is located in the water seal groove. A pH detector is installed on the cultivation pond.

[0006] It should be noted in the solution that the pressing component includes a pressing block, and one side of the pressing block is hinged to the inner bottom side of the water seal groove.

[0007] As a preferred implementation manner, the top corners of the installation frame are arc chamfers.

[0008] As a preferred implementation manner, a gas guide pipe is connected to the middle of one side of the shed film. The gas guide pipe is connected to a carbon dioxide collector. A one-way valve is provided on the gas guide pipe. The air outlet of the carbon dioxide collector is communicated with the cultivation pond.

[0009] It is further worth noting that an air supply pipe is provided in the upper middle part of the cultivation pond. Air outlet holes are evenly distributed on the air supply pipe. The air outlet of the carbon dioxide collector is connected to the air supply pipe.

[0010] As a preferred implementation manner, an oxygen detector is installed on the installation frame. The oxygen detector is located inside the shed film and close to the gas guide pipe.

[0011] Compared with the prior art, the carbon dioxide inflation device for spirulina cultivation provided by the present utility model has at least the following beneficial effects:

[0012] The carbon storage tank at the bottom of the inflatable chamber is connected to the bottom side of the aquaculture pond through multiple evenly distributed short pipes. An electric stop valve is provided at the connection between the carbon storage tank and the short pipes. By controlling the switch of the electric stop valve and adjusting the valve opening, an appropriate amount of carbon dioxide can be added to the aquaculture pond. The inflatable chamber is arranged below the aquaculture pond, and carbon dioxide can be transported only through the short pipes, effectively shortening the transportation distance. Coupled with the even distribution of the short pipes, while achieving precise control of the carbon dioxide supplementation rate, carbon dioxide can enter the aquaculture pond evenly. Through the bubble atomizer at the air outlet of each short pipe, carbon dioxide can be divided into several small bubbles, thereby increasing the contact area between carbon dioxide and the culture solution and improving the utilization rate of carbon dioxide. For the carbon dioxide escaping from the aquaculture pond, the bottom edge of the shed film can be pressed into the water seal groove through the water seal groove on the outer periphery of the top of the aquaculture pond in cooperation with the pressing assembly arranged at the bottom of the water seal groove, so as to form a sealed cover above the aquaculture pond to prevent carbon dioxide from overflowing. The carbon dioxide located in the lower layer of the gas can be further absorbed and utilized by the spirulina. The pH value of the culture solution can be monitored in real time through the pH detector installed on the aquaculture pond. According to the measured pH value, the electric stop valve is controlled to adjust the carbon dioxide supplementation rate, realizing the automatic supplementation of carbon dioxide during spirulina cultivation and ensuring that the pH value of the culture solution is always maintained within a stable range suitable for the growth of spirulina. Brief Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the present invention, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0014] Figure 1 Structural schematic diagram of a carbon dioxide inflation device for spirulina cultivation provided by the present invention;

[0015] Figure 2 Enlarged structural schematic diagram of part A provided by the present invention;

[0016] In the figure: 1, aquaculture pond; 2, inflatable chamber; 3, carbon storage tank; 4, short pipe; 5, bubble atomizer; 6, electric stop valve; 7, water seal groove; 8, pressing assembly; 81, pressing block; 9, mounting rack; 10, shed film; 11, pH detector; 12, carbon dioxide collector; 13, one-way valve; 14, air supply pipe; 15, air outlet; 16, oxygen detector; 17, air guide pipe. Detailed Embodiment

[0017] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] The core of the present utility model is to provide a carbon dioxide inflation device for spirulina cultivation, which solves the problems that the carbon dioxide inflation device in the existing column or pipeline cultivation mode occupies the internal space of the column or pipeline, affects the yield of spirulina, and is not convenient for precisely controlling the carbon dioxide addition rate.

[0019] Figure 1 The following is a schematic structural diagram of a carbon dioxide inflation device for spirulina cultivation provided by the present utility model. Figure 2 The following is an enlarged structural diagram of part A provided by the present utility model. Refer to Figures 1 to 2 as shown.

[0020] Embodiment 1

[0021] A carbon dioxide inflation device for spirulina cultivation includes a cultivation pond 1 and an inflation chamber 2 located below the cultivation pond 1. Refer to Figure 1 . During actual construction, the inflation chamber 2 can be sunken into the ground. The bottom side of the cultivation pond 1 can be flush with the ground or also sunken into the ground. A carbon storage tank 3 is fixed at the bottom of the inflation chamber 2. The carbon dioxide reserve in the carbon storage tank can be higher than the carbon dioxide required for one batch of spirulina cultivation. After one batch of spirulina is harvested, carbon dioxide can be supplemented into the carbon storage tank 3 through an inlet pipe. During a complete cultivation cycle, there is no need to frequently supplement carbon dioxide. The carbon storage tank 3 is evenly connected to the bottom side of the cultivation pond 1 through a plurality of short pipes 4. It should be noted that the short pipes 4 are evenly distributed along the length direction of the cultivation pond 1, which can evenly send carbon dioxide into each area of the cultivation pond 1 and effectively shorten the carbon dioxide transportation distance. An electric stop valve 6 is provided at the connection between the short pipe 4 and the carbon storage tank 3. By controlling the switch of the electric stop valve 6 and adjusting the valve opening, the carbon dioxide supplementation acceleration rate and supplementation amount charged into the cultivation pond 1 by each short pipe 4 can be precisely controlled. A bubble refiner 5 is installed at the outlet of each short pipe 4. It should be noted that the bubble refiner 5 is located on the inner bottom side of the cultivation pond 1. The carbon dioxide in the short pipe 4 is cut into several small bubbles by the bubble refiner 5, thereby increasing the contact area between carbon dioxide and the culture solution in the cultivation pond 1, improving the dissolution rate of carbon dioxide in the culture solution, and enhancing the utilization rate of carbon dioxide.

[0022] The refined carbon dioxide moves upward from the bottom of the cultivation pond 1. Part of the carbon dioxide dissolves in the culture solution for spirulina to absorb, and part of the carbon dioxide that is not dissolved in the culture solution and not absorbed by spirulina escapes from the cultivation pond 1 during the continuous upward movement. Refer to Figure 1, an installation frame 9 is erected above the cultivation pond 1, and then the shed film 10 is installed on the installation frame 9. It should be noted that a whole piece of complete shed film should be selected for the shed film 10. Then, the bottom edge of the shed film 10 is sealed, and a sealed cover can be formed above the cultivation pond 1, thereby restricting the escape of carbon dioxide. By fixing a water seal groove 7 on the outer periphery of the top of the cultivation pond 1, the bottom of the installation frame 9 is fixed in the water seal groove 7, the bottom edge of the shed film 10 is located in the water seal groove 7, and a pressing assembly 8 is arranged at the bottom of the water seal groove 7. The pressing assembly 8 can press the bottom edge of the shed film 10 in the water seal groove 7, and the water in the water seal groove 7 is used to seal the shed film 10. Specifically, a loop-shaped water seal groove 7 is arranged along the outer periphery of the cuboid cultivation pond 1, and the water seal grooves 7 on each side of the cultivation pond 1 are interconnected. Water is poured into the water seal groove 7. The shed film 10 is erected above the cultivation pond 1 through the installation frame 9, and the pressing assembly 8 is used to press the bottom edge of the shed film 10 hanging around the cultivation pond 1 into the water seal groove 7. It is worth noting that pressing assemblies 8 are arranged in the water seal grooves 7 corresponding to the four sides of the cultivation pond 1 to ensure that each bottom edge of the shed film 10 can be pressed in the water seal groove 7, so that the escaped carbon dioxide stays inside the shed film 10. Spirulina decomposes carbon dioxide and water into organic substances through photosynthesis and releases oxygen. Since the density of carbon dioxide is greater than that of oxygen, the enclosed gas inside the sealed shed film 10 mainly includes oxygen in the upper layer and carbon dioxide in the lower layer. The carbon dioxide in the lower layer is close to the cultivation pond 1 and can be further absorbed and utilized by spirulina. A pH detector 11 is installed on the cultivation pond 1. The pH value of the culture solution can be monitored in real time through the pH detector 11. If the pH value of the culture solution is lower than the stable range suitable for the growth of spirulina, the electric stop valve 6 is controlled to close or the valve opening is adjusted to slow down the carbon dioxide replenishment rate and reduce the carbon dioxide content in the culture solution, so that the pH value of the culture solution rises to the stable range; if the pH value of the culture solution is higher than the stable range suitable for the growth of spirulina, the electric stop valve 6 is controlled to open or the valve opening is adjusted to speed up the carbon dioxide replenishment rate and increase the carbon dioxide content in the culture solution, so that the pH value of the culture solution drops back to the stable range. The pH detector 11 and the electric stop valve 6 are both electrically connected to the control system. Automatically regulating the opening and closing of the electric stop valve 6 according to the pH value measured by the pH detector 11 can realize the automatic regulation of the carbon dioxide replenishment rate and ensure that the pH value of the culture solution is always maintained within the stable range suitable for the growth of spirulina.

[0023] In some feasible implementation modes, refer to Figure 2, the pressing assembly 8 includes a pressing block 81. One side of the pressing block 81 is hinged to the inner bottom side of the water seal groove 7. When the pressing block 81 is lifted upwards, the pressing block 81 rotates upwards with the hinged side as the axis, and the movable side of the pressing block 81 is lifted, pulling away a certain distance from the inner bottom side of the water seal groove 7. The bottom edge of the shed film 10 is placed in the gap between the pressing block 81 and the inner bottom side of the water seal groove 7. When the pressing block 81 is pressed downwards, the shed film 10 is pressed tightly between the pressing block 81 and the bottom side of the water seal groove 7 by the self-weight of the pressing block 81. If the weight of the pressing block 81 is set to a weight suitable for lifting and cannot press the shed film 10 tightly, a counterweight can also be placed on the top side of the pressing block 81 to ensure that the bottom edge of the shed film 10 is pressed tightly in the water of the water seal groove 7. Preferably, the pressing block 81 is a rectangular block with the same length as each side of the water seal groove 7, which can prevent the bottom edge of the shed film 10 from floating on the water surface and causing air leakage, ensuring that the bottom edge of the shed film 10 can be fully immersed in the water to achieve a comprehensive and tight seal. Moreover, the pressing assembly 8 has a simple and reliable mechanical structure, which is convenient for the staff to seal or open the shed film 10 according to the actual aquaculture situation. Preferably, the top corners of the mounting frame 9 are rounded chamfers, which can prevent the mounting frame 9 from scratching the shed film 10, and the shed film 10 can be ensured to be closely attached to the mounting frame 9 through the transition of the rounded chamfers, further ensuring the tightness of the shed film 10 during sealing. Specifically, in some feasible implementation manners, the mounting frame 9 includes two inverted U-shaped frames arranged along the length direction of the aquaculture pond 1. The two ends of the two inverted U-shaped frames are respectively fixed at the two ends of the water seal groove 7 corresponding to the length direction of the aquaculture pond 1. The shed film 10 is laid on the two inverted U-shaped frames and supported to form a cover body.

[0024] Embodiment 2

[0025] On the basis of Embodiment 1, in order to further make full use of the escaped carbon dioxide sealed in the shed film 10 during sealing, a gas guide pipe 17 is connected to the middle of one side of the shed film 10. See Figure 1, the air duct 17 extends deep into the carbon dioxide layer in the lower layer of the gas inside the greenhouse film 10. The air duct 17 is connected to a carbon dioxide collector 12, which can be a gas separation device, a carbon capture device, or a direct air capture device. Through the carbon dioxide collector 12, carbon dioxide in the gas inside the greenhouse film 10 can be collected. A one-way valve 13 is provided on the air duct 17. The gas inside the greenhouse film 10 can enter the carbon dioxide collector 12 through the air duct 17, while the gas inside the carbon dioxide collector 12 cannot enter the greenhouse film 10 through the air duct 17, which can prevent the escape of excess gas into the greenhouse film and destroy the stability of the gas inside the greenhouse film 10. The air outlet of the carbon dioxide collector 12 is communicated with the aquaculture pond 1. The carbon dioxide collected and treated by the carbon dioxide collector 12 is sent back into the aquaculture pond 1 for recycling, further improving the utilization rate of carbon dioxide. It should be noted that there is still a certain difference between the purity of the carbon dioxide collected by the carbon dioxide collector 12 and the original carbon dioxide purity in the carbon storage tank 3. Therefore, the recycled carbon dioxide is not transported back to the carbon storage tank 3, and the carbon dioxide collected by the carbon dioxide collector 12 is directly sent back to the aquaculture pond 1. While recycling, it can avoid polluting the original carbon dioxide in the carbon storage tank 3.

[0026] Preferably, refer to Figure 1, an air supply pipe 14 is arranged in the upper middle part of the culture pond 1, and air outlet holes 15 are evenly distributed on the air supply pipe 14. The air outlet of the carbon dioxide collector 12 is connected to the air supply pipe 14, and the recycled carbon dioxide is sent into the air supply pipe 14 and then filled into the culture pond 1 through each air outlet hole 15, which can ensure that the recycled carbon dioxide can also be evenly distributed in the culture pond 1 and be in uniform contact with the culture solution therein, so that the spirulina can fully absorb and utilize the recycled carbon dioxide. During the process that the original carbon dioxide moves upward from the bottom side of the culture pond 1 through the short pipe 4, the carbon dioxide is preferentially absorbed by the culture solution at the bottom of the culture pond 1, resulting in a lower carbon dioxide content at the top of the culture pond 1 compared with that at the bottom of the culture pond 1. And the air supply pipe 14 is arranged in the upper middle part of the culture pond 1, and the recycled carbon dioxide can be used to supplement and fill the top of the culture pond 1, so as to ensure the uniformity of the carbon dioxide content in the upper and lower areas of the culture pond 1 and guarantee the uniformity of the pH value of the culture solution in the culture pond 1. Preferably, an oxygen detector 16 is installed on the mounting frame 9, and the oxygen detector 16 is located inside the greenhouse film 10 and close to the air guide pipe 17. The oxygen content in the greenhouse film 10 during sealing can be monitored in real time through the oxygen detector 16. When the oxygen content is too high, the gas in the greenhouse film 10 is sent into the carbon dioxide collector 12 through the air guide pipe 17, which can reduce the oxygen content in the enclosed gas in the greenhouse film 10. It should be noted that the oxygen detector 16 is also electrically connected to the control system. According to the detection situation transmitted by the oxygen detector 16 and in cooperation with the carbon dioxide collector 12, the carbon dioxide concentration in the greenhouse film 10 can be regulated on the basis of recycling the escaped carbon dioxide, and while filling an appropriate amount of carbon dioxide for the spirulina culture at a suitable filling rate, the utilization rate of the filled carbon dioxide can be fully improved.

[0027] The utility model connects the carbon storage tank 3 in the inflation chamber 2 with the bottom side of the culture pond 1 through a plurality of uniformly distributed short pipes 4. By controlling the switch of the electric stop valve 6 at the connection between the carbon storage tank 3 and the short pipe 4 and adjusting the valve opening degree, an appropriate amount of carbon dioxide can be added to the culture pond 1. The inflation chamber 2 is arranged below the culture pond 1, and the carbon dioxide can be transported only through the short pipes 4, effectively shortening the transportation distance. In addition, the short pipes 4 are uniformly distributed, so that while accurately controlling the carbon dioxide replenishment rate, the carbon dioxide can enter the culture pond 1 evenly. Through the bubble atomizer 5 at the air outlet of each short pipe 4, the carbon dioxide can be divided into several small bubbles, thereby increasing the contact area between the carbon dioxide and the culture solution and improving the utilization rate of the carbon dioxide. For the carbon dioxide escaping from the culture pond 1, the water seal groove 7 on the outer periphery of the top of the culture pond 1 and the pressing assembly 8 arranged at the bottom of the water seal groove 7 can press the bottom edge of the shed film 10 into the water seal groove 7, so as to form a sealing cover above the culture pond 1 and prevent the carbon dioxide from overflowing. The carbon dioxide located in the lower layer of the gas can be further absorbed and utilized by the spirulina. The pH value of the culture solution can be monitored in real time through the pH detector 11 installed on the culture pond 1. According to the measured pH value, the electric stop valve 6 is controlled to adjust the carbon dioxide replenishment rate, realizing the automatic replenishment of carbon dioxide during the cultivation of spirulina and ensuring that the pH value of the culture solution is always maintained within a stable range suitable for the growth of spirulina.

[0028] After considering the specification and the practice of the application disclosed herein, those skilled in the art will readily conceive of other embodiments of the present utility model. The present utility model is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present utility model and include the common general knowledge or conventional technical means in the technical field disclosed by the present utility model. The specification and the embodiments are only regarded as exemplary, and the true scope of the present utility model is pointed out by the claims.

[0029] It should be understood that the present utility model is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model.

Claims

1. A carbon dioxide inflation device for the cultivation of Spirulina, characterized in that, Including: A culture pond (1) and an air inflation chamber (2) located below the culture pond (1). A carbon storage tank (3) is fixed to the bottom of the air inflation chamber (2). The carbon storage tank (3) is connected to the bottom side of the culture pond (1) through a plurality of short pipes (4) evenly distributed. An air bubble refiner (5) is installed at the air outlet of each short pipe (4). The air bubble refiner (5) is located at the inner bottom side of the culture pond (1). An electric stop valve (6) is provided at the connection between the carbon storage tank (3) and the short pipe (4). A water seal groove (7) is fixed to the outer periphery of the top of the culture pond (1). A pressing component (8) is provided at the bottom of the water seal groove (7). An installation frame (9) is erected above the culture pond (1). The bottom of the installation frame (9) is fixed in the water seal groove (7). A shed film (10) is installed on the installation frame (9). The bottom edge of the shed film (10) is located in the water seal groove (7). A pH detector (11) is installed on the culture pond (1).

2. The carbon dioxide inflation device for spirulina cultivation according to claim 1, wherein The pressing component (8) includes a pressing block (81), and one side of the pressing block (81) is hinged to the inner bottom side of the water seal groove (7).

3. The carbon dioxide inflation device for spirulina cultivation according to claim 1, characterized in that, The top corners of the installation frame (9) are arc chamfers.

4. The carbon dioxide inflation device for spirulina cultivation according to claim 1, characterized in that, One middle part of the shed film (10) is connected with an air guide pipe (17). The air guide pipe (17) is connected with a carbon dioxide collector (12). A one-way valve (13) is provided on the air guide pipe (17). The air outlet of the carbon dioxide collector (12) is communicated with the culture pond (1).

5. The carbon dioxide inflation device for spirulina cultivation according to claim 4, wherein, An air supply pipe (14) is provided in the upper middle part of the culture pond (1). Air outlet holes (15) are evenly distributed on the air supply pipe (14). The air outlet of the carbon dioxide collector (12) is connected with the air supply pipe (14).

6. The carbon dioxide inflation device for spirulina cultivation according to claim 5, characterized in that, An oxygen detector (16) is installed on the installation frame (9). The oxygen detector (16) is located inside the shed film (10) and close to the air guide pipe (17).

Images