Microalgae cultivation system in cold region and control method thereof

Abstract

The application provides a cold region microalgae culture system and a control method thereof, and relates to the field of biological resource recycling. The cold region microalgae culture system comprises a sunlight greenhouse, a first control member, a second control member, a first oxygen channel, a second oxygen channel, a first carbon dioxide channel, a second carbon dioxide channel, a microalgae culture device and an aerobic composting device. The sunlight greenhouse is provided with a containing space. The microalgae culture device is communicated with the containing space through the first control member. The aerobic composting device is communicated with the containing space through the second control member. The second carbon dioxide channel, the microalgae culture device, the first oxygen channel, the aerobic composting device and the first carbon dioxide channel are sequentially connected, and the first carbon dioxide channel is connected with the second carbon dioxide channel. The second oxygen channel is connected with the bottom of the aerobic composting device. The application can reduce the energy consumption of the cold region microalgae culture system and improve the working efficiency of the cold region microalgae culture system.

Description

Technical Field

[0001] This invention relates to the field of biological resource recycling technology, and more specifically, to a microalgae cultivation system for cold regions and its control method. Background Technology

[0002] Microalgae can efficiently utilize nitrogen- and phosphorus-rich wastewater and carbon dioxide-rich waste gas to produce microalgal biomass rich in protein, oils, and active ingredients, as well as oxygen. Aerobic composting technology can rapidly utilize solid organic waste and oxygen to produce humus-rich bio-organic fertilizer and relatively warm carbon dioxide gas. However, in cold regions, the low outdoor temperatures significantly increase heat loss in both microalgae cultivation and aerobic composting systems. Furthermore, both systems currently require gas exchange with the outside environment to meet their oxygen and carbon dioxide needs. The introduction of these low-temperature gases not only impacts the systems but also further increases their energy consumption for heating. Summary of the Invention

[0003] The problem addressed by this invention is: how to reduce the energy consumption of microalgae cultivation systems in cold regions and improve their working efficiency.

[0004] To address the aforementioned problems, this invention provides a cold-region microalgae cultivation system, comprising: a solar greenhouse, a first control component, a second control component, a first oxygen channel, a second oxygen channel, a first carbon dioxide channel, a second carbon dioxide channel, a microalgae cultivation device, and an aerobic composting device. The solar greenhouse has a accommodating space, within which the first control component, the second control component, the first oxygen channel, the second oxygen channel, the first carbon dioxide channel, the second carbon dioxide channel, the microalgae cultivation device, and the aerobic composting device are all placed. The microalgae cultivation device is connected to the accommodating space via the first control component, and the aerobic composting device is connected to the accommodating space via the second control component. The second carbon dioxide channel, the microalgae cultivation device, the first oxygen channel, the aerobic composting device, and the first carbon dioxide channel are sequentially connected, with the first carbon dioxide channel connected to the second carbon dioxide channel. The second oxygen channel is connected to the bottom of the aerobic composting device.

[0005] Furthermore, the solar greenhouse also includes: a ground insulation layer, a top insulation layer, a first insulation support, a second insulation support, a fixing component, and a hot water storage tank. The first insulation support, the fixing component, the top insulation layer, the second insulation support, and the ground insulation layer are connected in sequence to form the accommodating space. The hot water storage tank is placed inside the accommodating space and on the ground insulation layer.

[0006] Furthermore, the ground insulation layer includes a heat insulation layer and a heat storage layer laid sequentially on the ground. The heat insulation layer includes a polystyrene board, and the heat storage layer includes red bricks and / or sand.

[0007] Furthermore, the top insulation layer includes: an insulation component, a first insulation film, and a second insulation film. The insulation component is located at the connection between the fixing component and the first insulation film. One end of the second insulation film is connected to the connection between the second insulation support component and the ground insulation layer. The other end of the second insulation film is connected to the first insulation support component through the fixing component. One end of the first insulation film is connected to the second insulation support component. The other end of the first insulation film is connected to the fixing component, and the first insulation film is suspended above the second insulation film.

[0008] Furthermore, the first oxygen channel is provided with a first solenoid valve, and the second oxygen channel is provided with a second air pump and a second one-way valve in sequence along the oxygen flow direction.

[0009] Furthermore, a second solenoid valve is provided on the first carbon dioxide channel, and a first air pump and a first check valve are sequentially provided on the second carbon dioxide channel along the carbon dioxide flow direction.

[0010] Furthermore, the inlet end of the first oxygen channel is connected to the top of the microalgae cultivation device, the outlet end of the first oxygen channel is connected to the bottom of the aerobic composting device, the inlet end of the first carbon dioxide channel is connected to the top of the aerobic composting device, the outlet end of the first carbon dioxide channel is connected to the inlet end of the second carbon dioxide channel, the outlet end of the second carbon dioxide channel is connected to the bottom of the microalgae cultivation device, and a third solenoid valve is provided at the connection between the first carbon dioxide channel and the second carbon dioxide channel.

[0011] Furthermore, the first carbon dioxide channel, the second carbon dioxide channel, and the first oxygen channel are all surrounded by heat insulation devices.

[0012] Furthermore, the cold-region microalgae cultivation system also includes a temperature detection device, which is installed inside the microalgae cultivation device.

[0013] Compared with existing technologies, this invention utilizes a solar greenhouse to store solar energy, reducing heat loss and preventing the impact of low-temperature gases from cold regions on the microalgae cultivation device and the aerobic composting device. Inside the solar greenhouse, this invention leverages the complementary nature of the microalgae cultivation device and the aerobic composting device. When the temperature in the microalgae cultivation device is too low, the high-concentration oxygen produced by the microalgae cultivation device is introduced into the aerobic composting device through a first oxygen channel. Conversely, the high-concentration carbon dioxide gas and bioreaction heat produced by the aerobic composting device are introduced into the microalgae cultivation device through a carbon dioxide channel. This eliminates the need for external energy replenishment, achieving the recycling and resource utilization of matter and energy between the two devices. This reduces the energy consumption of the microalgae cultivation system in cold regions while improving its efficiency. When the temperature in the microalgae cultivation device is suitable, the gases produced by the microalgae cultivation device and the aerobic composting device are discharged into the containment space through the first and second control components, ensuring gas balance within the containment space and preventing excessively low internal pressure, indirectly ensuring the safety of microalgae cultivation personnel. Meanwhile, the first carbon dioxide channel remains open, continuously supplying carbon dioxide to the microalgae cultivation device. This prevents the microalgae from experiencing reduced photosynthetic efficiency due to insufficient carbon dioxide, which would otherwise affect the growth and reproduction of algal cells. The first and second oxygen channels provide oxygen to the aerobic composting device, preventing it from undergoing anaerobic reactions due to insufficient oxygen, thus avoiding the production of biogas and potential safety hazards.

[0014] To address the above problems, the present invention also provides a control method for a cold-region microalgae cultivation system. Based on the cold-region microalgae cultivation system described above, the cold-region microalgae cultivation system further includes: acquiring the temperature inside the microalgae cultivation device.

[0015] When the temperature is greater than the preset temperature, the first control element, the second control element, the second oxygen channel and the second carbon dioxide channel are opened, and the first oxygen channel and the first carbon dioxide channel are closed.

[0016] When the temperature is lower than the preset temperature, the first control element, the second control element, and the second oxygen channel are controlled to close, and the first oxygen channel, the first carbon dioxide channel, and the second carbon dioxide channel are controlled to open.

[0017] Compared with existing technologies, the control method for a cold-region microalgae cultivation system provided by this invention first determines whether the temperature of the microalgae cultivation device needs to be increased based on the internal temperature of the device, thus avoiding economic losses caused by the failure to address excessively low temperatures in a timely manner. In low-temperature conditions, simply changing the opening and closing of the first control component, the second control component, the second oxygen channel, and the first carbon dioxide channel allows the microalgae cultivation device, the first oxygen channel, the aerobic composting device, the first carbon dioxide channel, and the second carbon dioxide channel to form a complete gas circulation system. The high-concentration oxygen generated by the microalgae cultivation device is directly introduced into the aerobic composting device, thereby promoting biological reactions in the aerobic composting device and generating a large amount of heat from the biological reaction, which is then transferred to the microalgae cultivation device, achieving the goal of increasing the temperature of the microalgae cultivation device. The switching method is simple and easy to operate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a cold-region microalgae cultivation system provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1-Sunlight greenhouse, 2-Top insulation layer, 21-Insulation component, 22-First insulation film, 23-Second insulation film, 3-Second insulation support component, 4-Ground insulation layer, 41-Insulation layer, 42-Sand, 43-Red brick, 5-First insulation support component, 6-Hot water storage tank, 7-First control component, 8-Second control component, 9-Third solenoid valve, 10-First solenoid valve, 11-Second solenoid valve, 12-First check valve, 13-First air pump, 14-Second air pump, 15-Second check valve, 16-Microalgae cultivation device, 17-Aerobic composting device, 18-Fixing component, 19-Horizon. Detailed Implementation

[0021] The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of embodiments of the invention includes the entire scope of the claims, as well as all available equivalents of the claims. In this document, each embodiment may be referred to individually or collectively with the term "invention," which is merely for convenience and is not intended to automatically limit the scope of the application to any single invention or inventive concept if more than one invention is disclosed.

[0022] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without requiring or implying any actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For structures, products, etc., disclosed in the embodiments, since they correspond to the disclosed parts, the descriptions are relatively simple; relevant details can be found in the method section.

[0023] In the description of this invention, it should be understood that the positive direction of "X" in the drawings represents upward, and the opposite direction of "X" represents downward. The orientation or positional relationship indicated by the term "X" is based on the orientation or positional relationship shown in the drawings and is only for the convenience of describing this invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown in the figure, an embodiment of the present invention provides a cold-region microalgae cultivation system, including: a solar greenhouse 1, a first control component 7, a second control component 8, a first oxygen channel, a second oxygen channel, a first carbon dioxide channel, a second carbon dioxide channel, a microalgae cultivation device 16, and an aerobic composting device 17. The solar greenhouse 1 is provided with a housing space. The first control component 7, the second control component 8, the first oxygen channel, the second oxygen channel, the first carbon dioxide channel, the second carbon dioxide channel, the microalgae cultivation device 16, and the aerobic composting device 17 are all placed in the housing space. The microalgae cultivation device 16 is connected to the housing space through the first control component 7, and the aerobic composting device 17 is connected to the housing space through the second control component 8. The second carbon dioxide channel, the microalgae cultivation device 16, the first oxygen channel, the aerobic composting device 17, and the first carbon dioxide channel are connected in sequence, and the first carbon dioxide channel is connected to the second carbon dioxide channel. The second oxygen channel is connected to the bottom of the aerobic composting device.

[0026] In some specific embodiments, the solar greenhouse 1 is located on the horizon 19, and its insulation material is a professional insulation material such as polystyrene board, which is difficult to degrade, thus preventing the heat inside the solar greenhouse 1 from transferring outwards. The aerobic composting device 17, under aerobic conditions, uses aerobic bacteria to absorb, oxidize, and decompose waste. A portion of the absorbed organic matter is oxidized into simple inorganic matter, while releasing energy (carbon dioxide and heat, etc.) needed for microbial growth. Another portion of the organic matter is synthesized into new cytoplasm, allowing microorganisms to continuously grow and reproduce, producing more organisms. The microalgae cultivation device 16 contains a microalgae cultivation tank. Microalgae can efficiently utilize nitrogen- and phosphorus-rich wastewater and carbon dioxide-rich waste gas to produce microalgae biomass rich in protein, oils, and active ingredients, as well as oxygen.

[0027] In some specific embodiments, when the internal temperature of the microalgae cultivation device 16 is suitable, the first control element 7 and the second control element 8, the second oxygen channel and the second carbon dioxide channel are all in the open state. The oxygen generated by the microalgae cultivation device 16 and the carbon dioxide generated by the aerobic composting device 17 are discharged into the containment space through the first control element 7 and the second control element 8. The microalgae cultivation device 16 obtains carbon dioxide from the containment space through the second carbon dioxide channel, and the aerobic composting device 17 obtains oxygen from the containment space through the second oxygen channel. The first control element 7 and the second control element 8 include: a solenoid valve, a rubber stopper, a ventilation window, etc. In this embodiment, a solenoid valve is chosen as the first control element 7 and the second control element 8 for easier control. When the temperature of the microalgae cultivation device 16 is too low, the high-concentration oxygen generated by the microalgae cultivation device 16 is directly introduced into the aerobic composting device 17 through the first oxygen channel to accelerate the biological reaction inside the aerobic composting device 17. A large amount of heat and high-concentration carbon dioxide are generated and introduced into the microalgae cultivation device 16 through the first carbon dioxide channel and the second carbon dioxide channel to raise the temperature of the microalgae cultivation device 16.

[0028] In this embodiment, solar greenhouse 1 is used to store solar energy, reducing heat loss and avoiding the impact of low-temperature gases from cold regions on the microalgae cultivation device 16 and the aerobic composting device 17. Inside the solar greenhouse 1, taking advantage of the complementary nature of the microalgae cultivation device 16 and the aerobic composting device 17, the high-concentration oxygen generated by the microalgae cultivation device 16 is introduced into the aerobic composting device 17 through the first oxygen channel, and the high-concentration carbon dioxide gas and bioreaction heat generated by the aerobic composting device 17 are introduced into the microalgae cultivation device 16 through the carbon dioxide channel. There is no need to replenish energy from the outside, realizing the recycling and resource utilization of materials and energy between the two devices, reducing the energy consumption of the microalgae cultivation system in cold regions while improving the efficiency of the microalgae cultivation system in cold regions.

[0029] Some preferred embodiments, such as Figure 1As shown, the solar greenhouse 1 also includes: a ground insulation layer 4, a top insulation layer 2, a first insulation support 5, a second insulation support 3, a fixing component 18, and a hot water storage tank 6. The first insulation support 5, the fixing component 18, the top insulation layer 2, the second insulation support 3, and the ground insulation layer 4 are connected in sequence to form an accommodating space. The hot water storage tank 6 is placed inside the accommodating space and on the ground insulation layer 4.

[0030] In some specific embodiments, the ground insulation layer 4 is located on the horizon 19, and uses professional insulation materials to reduce the downward transfer of temperature within the greenhouse 1, thus reducing temperature loss. The second insulation support 3 and the first insulation support 5 use polystyrene board as insulation material to reduce the lateral transfer of temperature within the greenhouse 1, thus reducing temperature loss. The height of the second insulation support 3 is the same as the height of the ground insulation layer 4, and the distance from the highest point of the first insulation support 5 to the ground is greater than the distance from the highest point of the second insulation support 3 to the ground, thus creating a height difference and increasing the light-gathering performance of the greenhouse 1. The hot water storage tank 6 is located inside the accommodating space and placed on the ground insulation layer 4, utilizing the high specific heat capacity of water to store thermal energy.

[0031] In some preferred embodiments, the first thermal insulation support 5 includes a first support portion and a second support portion. One end of the first support portion is connected to the ground insulation layer 4, the other end of the first support portion is connected to one end of the second support portion, and the other end of the second support portion is connected to the fixing member 18. The included angle between the connection portion of the first support portion and the second support portion is an obtuse angle, which can increase the volume of the accommodating space without reducing the light-receiving area of ​​the solar greenhouse 1.

[0032] In some preferred embodiments, the ground insulation layer 4 includes an insulation layer 41 and a heat storage layer laid sequentially on the ground. The insulation layer 41 includes a polystyrene board, and the heat storage layer includes red bricks 43 and / or sand 42.

[0033] In some specific embodiments, polystyrene boards, sand 42, and red bricks 43 are laid from bottom to top on the horizon 19. The polystyrene boards insulate the temperature inside the solar greenhouse from being transferred to the ground, while the sand 42 and red bricks 43 laid on the ground accumulate solar energy entering the greenhouse, achieving efficient accumulation and storage of solar energy and reducing heat loss inside the solar greenhouse 1.

[0034] In some preferred embodiments, the top insulation layer 2 includes: an insulation component 21, a first insulation film 22, and a second insulation film 23. The insulation component 21 is located at the connection between the fixing component 18 and the first insulation film 22. One end of the second insulation film 23 is connected to the connection between the second insulation support component 3 and the ground insulation layer 4. The other end of the second insulation film 23 is connected to the first insulation support component 5 through the fixing component 18. One end of the first insulation film 22 is connected to the second insulation support component 3. The other end of the first insulation film 22 is connected to the fixing component 18, and the first insulation film 22 is suspended above the second insulation film 23.

[0035] In some specific embodiments, the insulation component 21 is an insulation blanket. When there is sufficient sunlight, the insulation blanket is rolled up and fixed at the connection between the fixing component 18 and the first insulation film 22, which is conducive to the solar greenhouse 1 absorbing solar energy and the photosynthesis of the microalgae cultivation device 16. At night or when there is insufficient sunlight, the insulation blanket is unfolded and laid on top of the first insulation film 22 to reduce the loss of temperature inside the solar greenhouse 1.

[0036] In addition, combined Figure 1 As shown, this embodiment employs a double-layer membrane structure. Both the first insulation film 22 and the second insulation film 23 are transparent films. One end of the second insulation film 23 connects to the connection between the second insulation support 3 and the ground insulation layer 4. The other end of the second insulation film 23 is connected to the connection between the second support and the first support via the bottom of the fixing member 18. Both ends of the first insulation film 22 are connected to the outer side of the second insulation support 3 and the top of the fixing member 18, respectively. This allows the first insulation film 22 to be suspended above the second insulation film 23, reducing temperature loss within the solar greenhouse 1 without hindering solar energy acquisition. The second insulation film 23, the fixing member 18, and the second support form an insulation cavity that can store heat. It should be noted that in this embodiment, the side of the second insulation support 3 connected to the ground insulation layer 4 is the inner side, and the side of the second insulation support 3 opposite to the connecting side is the outer side.

[0037] In some specific embodiments, under sufficient sunlight, the insulation is rolled up and fixed at the connection between the fixing member 18 and the first insulation film 22. Sunlight passes through the first insulation film 22 and the second insulation film 23 into the solar greenhouse 1, causing the enclosed air inside the solar greenhouse 1 to continuously heat up. The hot water storage tank 6, sand 42, red brick 43 and the microalgae culture solution in the microalgae culture device 16 absorb and store the heat in the air, continuously increasing their own temperature. As a result, the temperature inside the solar greenhouse 1 is higher than the outdoor temperature, which is conducive to the growth of microalgae in the microalgae culture device 16.

[0038] In this embodiment, the heat loss inside the solar greenhouse 1 is reduced by the heat insulation component 21, the first heat insulation film 22 and the second heat insulation film 23, thereby improving the utilization and conversion ratio of solar energy.

[0039] In some preferred embodiments, the inlet end of the first oxygen channel is connected to the top of the microalgae cultivation device 16, the outlet end of the first oxygen channel is connected to the bottom of the aerobic composting device 17, the inlet end of the first carbon dioxide channel is connected to the top of the aerobic composting device 17, the outlet end of the first carbon dioxide channel is connected to the inlet end of the second carbon dioxide channel, the outlet end of the second carbon dioxide channel is connected to the bottom of the microalgae cultivation device 16, and a third solenoid valve 9 is provided at the connection between the first carbon dioxide channel and the second carbon dioxide channel.

[0040] In some specific embodiments, the first oxygen channel directly introduces the high-concentration oxygen generated by the microalgae cultivation device 16 into the bottom of the aerobic composting device 17, increasing the contact area between the high-concentration oxygen and the aerobic composting reactants, which can accelerate the reaction speed of the aerobic composting device 17 and generate more carbon dioxide and ammonia mixture and heat in a short time. Similarly, the first carbon dioxide channel introduces the high-concentration carbon dioxide and bioreaction heat generated by the aerobic composting device 17 into the microalgae cultivation device 16 through the second carbon dioxide channel, raising the temperature of the microalgae cultivation device 16.

[0041] In some specific embodiments, when the first carbon dioxide channel is closed, the third solenoid valve 9 is opened, and the second carbon dioxide channel obtains gas (carbon dioxide) from the containment space through the third solenoid valve 9 and introduces it into the bottom of the microalgae cultivation device 16. When the first carbon dioxide channel is opened, the third solenoid valve 9 is closed, and the second carbon dioxide channel obtains high-concentration carbon dioxide and bioreaction heat generated by the aerobic composting device 17 through the first carbon dioxide channel and introduces it into the bottom of the microalgae cultivation device 16.

[0042] In this embodiment, the high-concentration oxygen generated by the microalgae cultivation device 16 is directly introduced into the bottom of the aerobic composting device 17 through the first oxygen channel. This ensures a sufficient oxygen supply to the aerobic composting device 17 even with a relatively low aeration rate, effectively preventing the generation of biogas due to insufficient oxygen supply and ensuring the safe and efficient operation of the aerobic composting device 17. Simultaneously, the high-concentration carbon dioxide and bioreactor heat generated by the aerobic composting device 17 are introduced into the microalgae cultivation device 16 through the second carbon dioxide channel via the first carbon dioxide channel, raising the temperature of the microalgae cultivation device 16 and realizing the resource utilization of carbon dioxide and oxygen.

[0043] In some preferred embodiments, the first oxygen channel is provided with a first solenoid valve 10, and the second oxygen channel is provided with a second air pump 14 and a second one-way valve 15 in sequence along the oxygen flow direction.

[0044] In some specific embodiments, when the internal temperature of the microalgae cultivation device 16 is suitable, the first oxygen channel is closed and the second oxygen channel is opened. The gas (oxygen) obtained from the containment space by the second oxygen channel is introduced into the bottom of the aerobic composting device 17. When the internal temperature of the microalgae cultivation device 16 is too low, the first oxygen channel is opened and the second oxygen channel is closed. The first oxygen channel directly transmits the high-concentration oxygen generated by the microalgae cultivation device 16 to the aerobic composting device 17, achieving a sufficient oxygen supply with a relatively small aeration rate. This avoids the aerobic composting device from undergoing anaerobic reaction due to insufficient oxygen, producing biogas and causing safety hazards. In this embodiment, the opening and closing of the first oxygen channel is controlled by the first solenoid valve 10, and the opening and closing of the second oxygen channel is controlled by the second air pump 14.

[0045] In some preferred embodiments, a second solenoid valve 11 is provided on the first carbon dioxide channel, and a first air pump 13 and a first one-way valve 12 are sequentially provided on the second carbon dioxide channel along the carbon dioxide flow direction.

[0046] In some specific embodiments, when the internal temperature of the microalgae cultivation device 16 is suitable, the second carbon dioxide channel obtains gas (carbon dioxide) from the containment space and introduces it into the microalgae cultivation device 16 through the third solenoid valve 9 (the third solenoid valve 9 is open), while the first carbon dioxide channel is closed. When the internal temperature of the microalgae cultivation device 16 is too low, the first carbon dioxide channel opens, and the high-concentration carbon dioxide and bioreactor heat obtained from the aerobic composting device 17 are introduced into the microalgae cultivation device 16 through the second carbon dioxide channel (the third solenoid valve 9 is closed). In this embodiment, the first air pump 13 and the first one-way valve 12 are always open, and the opening and closing of the first carbon dioxide channel is controlled by the opening and closing of the second solenoid valve 11.

[0047] In this embodiment, the second carbon dioxide channel is always open, continuously providing carbon dioxide to the microalgae culture device 16, thus preventing the microalgae culture device 16 from reducing the photosynthetic efficiency of microalgae due to lack of carbon dioxide, thereby affecting the growth and reproduction of algal cells.

[0048] In some preferred embodiments, the first carbon dioxide channel, the second carbon dioxide channel, and the first oxygen channel are all surrounded by a heat insulation device.

[0049] In some specific embodiments, the insulation device can be an insulation blanket, insulation cotton, or insulation rubber. It should be noted that the insulation device can be specifically configured according to the situation, and no limitation is made here.

[0050] In this embodiment, by surrounding the first carbon dioxide channel, the second carbon dioxide channel and the first oxygen channel with a heat insulation device, the heat loss during the process of transferring the reaction heat generated by the aerobic composting device 17 to the microalgae cultivation device 16 is reduced.

[0051] In some preferred embodiments, the cold-region microalgae cultivation system further includes a temperature detection device connected to the microalgae cultivation device 16.

[0052] In some specific embodiments, the temperature detection device includes a temperature sensor for real-time monitoring of the temperature of the microalgae cultivation device 16. The microalgae cultivation device 16 contains a microalgae cultivation tank, and microalgae growth requires a relatively high temperature environment. If the temperature is too low, it will reduce the growth rate of microalgae or cause microalgae death. Therefore, it is necessary to monitor the temperature of the microalgae cultivation device 16 in real time in order to detect and solve problems in a timely manner.

[0053] In this embodiment, a temperature detection device is set up to detect the temperature of the microalgae cultivation device 16 in real time, so as to provide heat to the microalgae cultivation device 16 in a timely manner and avoid unnecessary economic losses caused by the microalgae cultivation device 16 being too low.

[0054] The operating states of the cold-region microalgae cultivation system described in this embodiment include:

[0055] When the internal temperature of the microalgae cultivation device 16 is suitable, the first control component 7, the second control component 8, the first air pump 13, the second air pump 14, the first one-way valve 12, the second one-way valve 15, and the third solenoid valve 9 are opened, and the first solenoid valve 10 and the second solenoid valve 11 are closed. The oxygen generated by the microalgae cultivation device 16 is introduced into the containment space through the first control component 7, and the carbon dioxide generated by the aerobic composting device 17 is introduced into the containment space through the second control component 8. The first air pump 13 introduces the gas (carbon dioxide) in the containment space into the bottom of the microalgae cultivation device 16 through the third solenoid valve 9 and the first one-way valve 12, and the second air pump 14 introduces the gas (oxygen) in the containment space into the bottom of the aerobic composting device 17 through the second one-way valve 15.

[0056] When the internal temperature of the microalgae cultivation device 16 is low, the first control component 7, the second control component 8, the third solenoid valve 9, and the second air pump 14 are closed, while the first solenoid valve 10 and the second solenoid valve 11 are opened. The high concentration of oxygen generated by the microalgae cultivation device 16 is directly introduced into the bottom of the aerobic composting device 17 through the first solenoid valve 10, promoting the production of carbon dioxide and heat in the aerobic composting device 17, and then directly introducing the carbon dioxide and heat into the bottom of the microalgae cultivation device 16 through the second solenoid valve 11.

[0057] Another embodiment of the present invention provides a control method for a cold-region microalgae cultivation system, comprising:

[0058] Obtain the internal temperature of the microalgae culture device 16;

[0059] When the temperature is greater than the preset temperature, the first control element 7, the second control element 8, the second oxygen channel and the second carbon dioxide channel are opened, and the first oxygen channel and the first carbon dioxide channel are closed; when the temperature is less than the preset temperature, the first control element 7, the second control element 8 and the second oxygen channel are closed, and the first oxygen channel, the first carbon dioxide channel and the second carbon dioxide channel are opened.

[0060] In some specific embodiments, based on the microalgae growth requirements, the preset temperature is 25℃-30℃. When the internal temperature of the microalgae cultivation device 16 is higher than the preset temperature, i.e., when the internal temperature of the microalgae device 16 is suitable, the first control component 7, the second control component 8, the third solenoid valve 9, the second carbon dioxide channel, and the second oxygen channel are opened, while the first oxygen channel and the first carbon dioxide channel are closed. The gases generated by the aerobic composting device 17 and the microalgae cultivation device 16 are respectively introduced into the containment space through the first control component 7 and the second control component 8. The aerobic composting device 17 obtains the gas (oxygen) required for the biological reaction through the second oxygen channel. The gas (carbon dioxide) in the containment space enters the second carbon dioxide channel through the third solenoid valve 9 and is transported to the bottom of the microalgae cultivation device 16 under the drive of the first air pump 13.

[0061] In some specific embodiments, when the internal temperature of the microalgae cultivation device 16 is lower than the preset temperature, i.e., the internal temperature of the microalgae cultivation device 16 is too low, the first control component 7, the second control component 8, the second air pump 14, and the third solenoid valve 9 are closed, and the first oxygen channel and the first carbon dioxide channel are opened. The oxygen generated by the microalgae cultivation device 16 is directly introduced into the bottom of the aerobic composting device 17 through the first oxygen channel, which accelerates the reaction speed of the aerobic composting device 17 and generates more carbon dioxide and ammonia mixture and heat in a short time. The mixture is then directly introduced into the bottom of the microalgae cultivation device 16 through the first carbon dioxide channel and the second carbon dioxide channel, raising the temperature of the microalgae cultivation device 16 until the temperature detection device detects that the temperature of the microalgae cultivation device 16 is higher than the preset temperature. At this point, the first oxygen channel and the first carbon dioxide channel are closed, and the first control component 7, the second control component 8, the third solenoid valve 9, and the second oxygen channel are opened.

[0062] In this embodiment, the temperature inside the microalgae cultivation device 16 is monitored in real time to determine whether the temperature of the microalgae cultivation device 16 needs to be increased. Heat is then provided to the microalgae cultivation device 16 in a timely manner to avoid unnecessary economic losses due to excessively low temperatures. When the temperature inside the microalgae cultivation device 16 is too low, simply changing the opening and closing of the first control component 7, the second control component 8, the third solenoid valve 9, the second oxygen channel, and the first carbon dioxide channel allows the microalgae cultivation device 16, the first oxygen channel, the aerobic composting device 17, the first carbon dioxide channel, and the second carbon dioxide channel to form a complete gas circulation system. The high-concentration oxygen generated by the microalgae cultivation device 16 is directly introduced into the aerobic composting device 17, thereby promoting the biological reaction in the aerobic composting device 17, generating a large amount of heat from the biological reaction, which is then transferred to the microalgae cultivation device 16, achieving the goal of increasing the temperature of the microalgae cultivation device 16. The switching method is simple and easy to operate.

[0063] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A microalgae cultivation system for cold regions, characterized in that, include: The solar greenhouse (1) comprises a first control unit (7), a second control unit (8), a first oxygen channel, a second oxygen channel, a first carbon dioxide channel, a second carbon dioxide channel, a microalgae cultivation device (16), and an aerobic composting device (17). The solar greenhouse (1) has a accommodating space. The first control unit (7), the second control unit (8), the first oxygen channel, the second oxygen channel, the first carbon dioxide channel, the second carbon dioxide channel, the microalgae cultivation device (16), and the aerobic composting device (17) are all placed in the accommodating space. The microalgae cultivation device (16) is connected to the accommodating space through the first control unit (7), and the aerobic composting device (17) is connected to the accommodating space through the second control unit (8). The second carbon dioxide channel, the microalgae cultivation device (16), the first oxygen channel, the aerobic composting device (17), and the first carbon dioxide channel are connected in sequence, and the first carbon dioxide channel is connected to the second carbon dioxide channel. The second oxygen channel is connected to the... The bottom of the aerobic composting device is connected, the air inlet of the first oxygen channel is connected to the top of the microalgae cultivation device (16), the air outlet of the first oxygen channel is connected to the bottom of the aerobic composting device (17), the air inlet of the first carbon dioxide channel is connected to the top of the aerobic composting device (17), the air outlet of the first carbon dioxide channel is connected to the air inlet of the second carbon dioxide channel, the air outlet of the second carbon dioxide channel is connected to the bottom of the microalgae cultivation device (16), and a third solenoid valve (9) is provided at the connection between the first carbon dioxide channel and the second carbon dioxide channel. The solar greenhouse (1) includes a first heat-insulating support (5), a fixing member (18), a top heat-insulating layer (2), a second heat-insulating support (3), and a ground heat-insulating layer (4) connected in sequence to form the accommodating space. The height of the second heat-insulating support (3) is the same as the height of the ground heat-insulating layer (4). The distance from the highest point of the first heat-insulating support (5) to the ground is greater than the distance from the highest point of the second heat-insulating support (3) to the ground.

2. The cold-region microalgae cultivation system according to claim 1, characterized in that, The solar greenhouse (1) also includes a hot water storage tank (6), which is placed in the accommodating space and on the ground insulation layer (4).

3. The cold-region microalgae cultivation system according to claim 2, characterized in that, The ground insulation layer (4) includes a heat insulation layer (41) and a heat storage layer laid sequentially on the ground. The heat insulation layer (41) includes a polystyrene board, and the heat storage layer includes red bricks (43) and / or sand (42).

4. The cold-region microalgae cultivation system according to claim 2, characterized in that, The top insulation layer (2) includes an insulation component (21), a first insulation film (22), and a second insulation film (23). The insulation component (21) is located at the connection between the fixing component (18) and the first insulation film (22). One end of the second insulation film (23) is connected to the connection between the second insulation support component (3) and the ground insulation layer (4). The other end of the second insulation film (23) is connected to the first insulation support component (5) through the fixing component (18). One end of the first insulation film (22) is connected to the second insulation support component (3). The other end of the first insulation film (22) is connected to the fixing component (18). The first insulation film (22) is suspended above the second insulation film (23).

5. The cold-region microalgae cultivation system according to claim 1, characterized in that, The first oxygen channel is provided with a first solenoid valve (10), and the second oxygen channel is provided with a second air pump (14) and a second one-way valve (15) in sequence along the oxygen flow direction.

6. The cold-region microalgae cultivation system according to claim 1, characterized in that, The first carbon dioxide channel is provided with a second solenoid valve (11), and the second carbon dioxide channel is provided with a first air pump (13) and a first check valve (12) in sequence along the carbon dioxide flow direction.

7. The cold-region microalgae cultivation system according to claim 1, characterized in that, The first carbon dioxide channel, the second carbon dioxide channel, and the first oxygen channel are all surrounded by heat insulation devices.

8. The cold-region microalgae cultivation system according to claim 1, characterized in that, It also includes a temperature detection device, which is connected to the microalgae culture device (16).

9. A control method for a cold-region microalgae cultivation system as described in any one of claims 1-8, characterized in that, include: Obtain the temperature inside the microalgae culture device (16). When the temperature is greater than the preset temperature, the first control element (7), the second control element (8), the second oxygen channel and the second carbon dioxide channel are opened, and the first oxygen channel and the first carbon dioxide channel are closed. When the temperature is lower than the preset temperature, the first control element (7), the second control element (8) and the second oxygen channel are closed, and the first oxygen channel, the first carbon dioxide channel and the second carbon dioxide channel are opened.

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