Runway pond for culturing microalgae by using photovoltaic green electricity

Abstract

The utility model relates to the field of microalgae culture, in particular to a raceway pond for microalgae culture by using photovoltaic green electricity. Comprising a photovoltaic panel, a photovoltaic panel supporting assembly and a runway pond structure below the photovoltaic panel, a flow separation wall is arranged in the middle of the runway pond structure, the runway pond structure is divided into two parts by the flow separation wall to form two circulating flow channels, and a circulating stirring paddle is arranged on one side of the flow separation wall. The height from the lowest end of the photovoltaic panel to the ground is equal to the height of the tank wall of the raceway tank, the photovoltaic panel supporting assembly is fixed on a middle partition wall of the raceway tank, a light source vertically irradiating the structural liquid level of the raceway tank is fixedly arranged on the bottom surface of the photovoltaic panel, and the light source, the stirring paddle and the photovoltaic panel are connected through a circuit.

Description

Technical Field

[0001] The present invention relates to the field of microalgae cultivation, and in particular to a runway pool for cultivating microalgae using photovoltaic green electricity. Background Art

[0002] Microalgae convert solar energy into chemical energy through photosynthesis, which is stored in cells and forms biomass, which can be used as food, nutritional supplements, aquatic bait, etc., and can be further processed into biofuel. However, the current light energy conversion rate of microalgae photosynthesis is about 1%, which is far lower than the theoretical conversion rate of 12%. In order to improve the light energy utilization rate of microalgae, the culture method usually adopted is thin layer culture, and the culture facilities are shallow runway pools. Such facilities occupy a large area and are not suitable for microalgae cultivation in areas with tight land resources.

[0003] Photovoltaics, as one of the main forms of new energy, is an industry that countries around the world are vigorously developing. At present, the maximum efficiency of large-scale monocrystalline silicon photovoltaic cells is 26.6%, which is much higher than other forms of light energy utilization. Photovoltaic settings can be determined according to the terrain and do not occupy arable land. Usually, photovoltaic panels are arranged in an east-west tilted manner and at a certain distance from the ground. According to the law of sunlight at the installation site, intervals are set between each row of photovoltaic panels so that the front and rear photovoltaic panels do not block each other, and space is also reserved for cleaning and maintenance.

[0004] The time for microalgae to grow under natural light is less than 12 hours per day. Assuming that green electricity generated by photovoltaics is used for cell reproduction, it can be combined with energy storage to achieve all-weather cultivation. Patent 202210902950.8 discloses a method for cultivating microalgae in combination with photovoltaic panels, in which a photobioreactor for microalgae cultivation is set in the gap between each row of photovoltaic panels, and by raising the distance between the photovoltaic panels and the ground, the photovoltaic panels can achieve a 20-80% shading ratio for the microalgae cultivation pool. This design increases the height of the supporting material of the photovoltaic panel, thereby weakening the wind resistance of the photovoltaic panel. At the same time, in order to reduce shading, the spacing between each row of photovoltaic panels is increased, the number of photovoltaic panels arranged under the same floor area is reduced, and the green electricity production is reduced. Patent CN202320008188.9 discloses a system for setting photovoltaic panels in a microalgae greenhouse to drive the circulation of algae liquid. In order to increase the power generation, the design increases the height of the greenhouse and changes the structure of the original runway pool, which makes the actual construction difficult.

[0005] By utilizing the existing relatively mature photovoltaic panel layout rules and combining them with microalgae cultivation without reducing power generation, and by fixing carbon dioxide during the growth of microalgae, green electricity cultivation of microalgae can be achieved, reducing carbon emissions. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a runway pool for microalgae cultivation using photovoltaic green electricity. Without changing the basic layout rules of existing photovoltaic panels and without reducing the power generation, it can achieve 24-hour continuous growth of microalgae. At the same time, the photovoltaic panels provide a barrier to block wind and rain for the open runway pool, thereby increasing the effective time of microalgae production throughout the year.

[0007] In order to achieve the above technical purpose, the technical solution adopted by the utility model is a runway pool that uses photovoltaic green electricity to cultivate microalgae.

[0008] It includes a photovoltaic panel, a photovoltaic panel support assembly, and a runway pool structure under the photovoltaic panel. A flow partition wall is arranged in the middle of the runway pool structure. The flow partition wall divides the runway pool structure into two to form two circulation flow channels. A circulating stirring paddle is arranged on one side of the flow partition wall. It is characterized in that a runway pool is arranged below the photovoltaic panel, the height of the lowest end of the photovoltaic panel from the ground is the height of the runway pool wall, the photovoltaic panel support assembly is fixed on the middle flow partition wall of the runway pool, a light source that vertically irradiates the liquid surface of the runway pool structure is fixed on the bottom surface of the photovoltaic panel, and the light source, stirring paddle and photovoltaic panel are connected through a circuit.

[0009] Furthermore, the height of the lowest end of the photovoltaic panel from the ground or the wall of the runway pool is 30-60 cm.

[0010] Furthermore, the photovoltaic panels are arranged on a flat ground in an east-west direction and tilted toward the south, and are arranged at an inclination angle θ of 0-45° according to the lighting conditions in different regions.

[0011] Furthermore, the height of the highest end of the photovoltaic panel from the ground is the product of the total width of the photovoltaic panel and sinθ, and the height of the highest end from the ground does not exceed 5m.

[0012] Furthermore, the total width of the runway pool structure is the product of the total width of the photovoltaic panels and cosθ, and the total width of the runway pool structure does not exceed 10m.

[0013] Furthermore, the length of the runway pool structure is consistent with the length of each row of photovoltaic panels, and the length of the runway pool structure does not exceed 100m.

[0014] Furthermore, the light source is an LED light source, which uses green electricity generated by photovoltaics for 24 hours of continuous lighting. The LED light source is less than 10 cm above the liquid surface; the LED light source covers an area of ​​20-80% of the total area of ​​the runway pool; the light intensity is 50-300 μmol / m 2 / s.

[0015] Furthermore, the driving motor of the stirring paddle uses green electricity generated by photovoltaics, and the stirring is started synchronously with the LED light source. Under the action of the stirring paddle, the culture solution circulates in the runway pool at a rate of 20-50cm / s.

[0016] Furthermore, an isolated carbon replenishment circulation barrel is provided at one end of the raceway pool structure, and an aeration device is provided at the bottom of the barrel. The culture fluid enters the circulation barrel from one flow channel of the raceway pool and returns to another flow channel after carbon replenishment.

[0017] Furthermore, the utility model also provides a microalgae cultivation system having multiple runway pools composed of the above-mentioned runway pools for cultivating microalgae using photovoltaic green electricity. The system reserves a certain gap between the front and rear rows of photovoltaic panels, and the width of the gap is preferably such that the photovoltaic panels do not block each other.

[0018] The beneficial effect of the utility model is that the runway pool is completely covered by the photovoltaic panels, and the photovoltaic panels also serve as a barrier to shelter from wind and rain, which can greatly extend the growth time of microalgae. Without changing the structure and layout rules of the existing photovoltaic panels and without reducing the power generation, the cultivation of microalgae using green electricity is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a top view perspective of the runway pool installation under the photovoltaic panels;

[0020] Figure 2 It is a side view of the array matrix of photovoltaic panels;

[0021] Figure 3 It is the basic structure of the runway pool;

[0022] 1-runway pool; 2-photovoltaic panel; 3-photovoltaic panel support assembly; 4-carbon replenishment circulation barrel; 5-runway pool wall; 6-runway pool flow isolation wall; 7-LED light source; 8-runway pool stirring paddle. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figure 1-3As shown, a runway pool for microalgae cultivation using photovoltaic green electricity includes a main structure runway pool structure 1 and photovoltaic panels 2; a runway pool structure 1 is arranged under each row of photovoltaic panels 2; the photovoltaic panel support assembly 3 is fixed on the middle partition wall 6 of the runway pool, and an LED light source 7 is fixed on the bottom surface of the photovoltaic panel 2 for vertically irradiating the liquid surface of the runway pool structure, and the photovoltaic panel assembly is composed of unit panels with a monomer size of 60*100cm, and each row of photovoltaic panels is composed of 4 unit panels horizontally and 100 unit panels vertically, so the total width d of each row of photovoltaic panels is 4m and the total length is 60m; the inclination angle θ of the photovoltaic panel is 30°, and the height of the runway pool wall 5 is 50cm, so the lowest end of the photovoltaic panel is flush with the runway pool wall, and the highest end is 2.5 meters from the ground; the total width of the runway pool is 3.4m and the total length is 60m.

[0025] An LED light source 7 is arranged on the upper part of the raceway pool 1, the lowest end of which is 5 cm above the liquid surface, the LED radiation area accounts for 20% of the total area of ​​the raceway pool, and the light intensity is 100 μmol / m 2 / s; a carbon replenishing circulation barrel 4 is set at one end of the runway pool 1, which replenishes CO2 according to the pH value of the culture solution; a circulating runway pool stirring paddle 8 is set in the flow channel on one side of the runway pool 1, and the culture solution flow rate is 30cm / s when started; the LED light source, circulation barrel drive pump and stirring paddle motor are all powered by photovoltaic green electricity.

[0026] Spirulina was inoculated in the runway pool with an inoculation density of 0.2 g / L and a liquid layer depth of 30 cm. The optimal pH range for cultivation was set to 9.5, that is, when the pH value was higher than 9.5, the carbon replenishment cycle barrel started to replenish CO2, and when it was lower than 9.5, the CO2 replenishment was stopped. The continuous cycle culture was carried out for 10 days, and evaporated water was replenished every day. At the end of the culture, the cell density of Spirulina was 0.6 g / L; the average growth rate was calculated to be 12 g / ㎡ / d.

[0027] Comparative Example 1

[0028] The same size of the runway pool, arranged in an open-air environment, uses natural light for cell growth, and the average growth rate after the same culture time is only 10g / ㎡ / d. This result shows that the green electricity generated by the photovoltaic panel provides a 24-hour uninterrupted light source for the growth of microalgae, which improves the growth efficiency of microalgae to a certain extent.

[0029] Example 2

[0030] The size of the runway pool and the arrangement of the photovoltaic panels are the same as those in Example 1, except that the area of ​​the runway pool covered by the LED light source accounts for 80%, and the light intensity is 300 μmol / m 2 / s; Spirulina was inoculated in the runway pool with an inoculation density of 0.2g / L and a liquid layer depth of 30cm. The most suitable pH range for cultivation was set to 9.5, that is, when the pH value was higher than 9.5, the carbon replenishment cycle barrel started to replenish CO2, and when it was lower than 9.5, the CO2 replenishment was stopped. The continuous cycle culture was carried out for 10 days, and the evaporated water was replenished every day. At the end of the culture, the cell density of Spirulina was 1.2g / L; the average growth rate was calculated to be 30g / ㎡ / d.

[0031] Comparative Example 2

[0032] The same size of the runway pool, arranged in an open-air environment, uses natural light for cell growth, and the average growth rate after the same culture time is only 12g / ㎡ / d. This result shows that the green electricity generated by the photovoltaic panel provides a 24-hour uninterrupted light source for the growth of microalgae, greatly improving the growth efficiency of microalgae.

Claims

1. A runway pool for cultivating microalgae using photovoltaic green electricity, comprising a photovoltaic panel, a photovoltaic panel support assembly, and a runway pool structure under the photovoltaic panel, wherein a flow partition wall is arranged in the middle of the runway pool structure, the flow partition wall divides the runway pool structure into two, forming two circulation channels, and a circulation stirring paddle is arranged on one side of the flow partition wall, characterized in that: A runway pool is arranged below the photovoltaic panel, the height from the lowest end of the photovoltaic panel to the ground is the height of the runway pool wall, the photovoltaic panel support assembly is fixed on the middle partition wall of the runway pool, and a light source is fixed on the bottom surface of the photovoltaic panel to vertically irradiate the liquid surface of the runway pool structure, and the light source, stirring paddle and photovoltaic panel are connected through a circuit.

2. A runway pool for cultivating microalgae using photovoltaic green electricity as claimed in claim 1, characterized in that: The height of the lowest end of the photovoltaic panel from the ground or the wall of the runway pool is 30-60 cm.

3. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 1, characterized in that: The photovoltaic panels are power generation devices arranged on a flat ground in an east-west direction and tilted toward the south, with an inclination angle θ of 0-45°.

4. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 3, characterized in that: The height of the highest end of the photovoltaic panel from the ground is the product of the total width of the photovoltaic panel and sinθ.

5. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 3, characterized in that: The total width of the runway pool structure is the product of the total width of the photovoltaic panels and cosθ.

6. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 3, characterized in that: The length of the runway pool structure is consistent with the length of each row of photovoltaic panels.

7. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 1, characterized in that: The light source is an LED light source, which uses green electricity generated by photovoltaics for 24-hour continuous lighting. The LED light source is less than 10 cm above the liquid surface, and the LED light source covers an area of ​​20-80% of the total area of ​​the runway pool.

8. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 1, characterized in that: The driving motor of the stirring paddle uses green electricity generated by photovoltaics, and the stirring is started synchronously with the LED light source.

9. A runway pond for cultivating microalgae using photovoltaic green electricity as claimed in claim 1, characterized in that: A separate carbon replenishment circulation barrel is arranged at one end of the raceway pool structure, and an aeration device is arranged at the bottom of the barrel. The culture fluid enters the circulation barrel from one flow channel of the raceway pool structure and returns to another flow channel after carbon replenishment.

10. A microalgae cultivation system comprising a plurality of runway pools for cultivating microalgae using photovoltaic green electricity according to any one of claims 1 to 9, characterized in that: The system reserves a certain gap between the front and rear rows of photovoltaic panels, and the width of the gap is preferably such that the photovoltaic panels do not block each other.

Images