Column type microalgae photobioreactor

Abstract

The utility model discloses a column type microalgae photobioreactor which comprises a vacuum pump, a buffer tank, a reactor, a bracket, an algae liquid storage pool and a central control device, the vacuum pump is sequentially connected with the buffer tank and the reactor through pipelines, the reactor is erected on the algae liquid storage pool through a support, and the central control device is connected with and controls all the devices. The reactor provided by the utility model takes the vacuum pump as driving force, and is provided with multiple buffer containers, so that the continuous operation of the system is prevented from being influenced by the pollution of the vacuum pump while the shearing force of a flow passage component of the water pump is avoided, and the problem of pain points in the application process of the traditional column type microalgae photoreactor is effectively solved; while the advantage of high carbon sequestration efficiency of the column type reactor is reserved, the problems that the column type reactor is difficult to clean, the water pump easily damages microalgae growth and the like are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of algae cultivation, and in particular relates to a column-type microalgae photobioreactor. Background Art

[0002] Carbon capture, utilization and storage (CCUS) technology is one of the key technologies to address global climate change. According to the nature of the technology, CCUS is divided into physical fixation, chemical fixation and biological fixation. In the current CCUS technology system, there are generally problems such as high investment and operating costs and unsustainable technology and economy. In the carbon utilization link, biological carbon fixation and utilization have high sustainable development potential.

[0003] In the biological carbon fixation method, microalgae, as a type of microscopic algae that is widely present in nature and can fix CO2 through photosynthesis, has received extensive attention and research around the world because of its high photosynthetic efficiency, short growth cycle, high oil content, adaptability to a variety of water sources, diversified downstream products, and no competition with crops for land.

[0004] The core of microalgae carbon fixation technology lies in the photobioreactor that carries the photosynthesis of microalgae. Photoreactors are generally divided into open photoreactors and closed photoreactors. Among them, closed photoreactors are one of the current research because of their advantages such as low pollution of the internal environment, high degree of equipment integration, and high carbon fixation efficiency. There are various forms of closed photoreactors. Among them, the column photoreactor is a photobioreactor with high carbon fixation function because it can carry a large area of ​​algae liquid per unit projected area. Existing column photoreactors generally have the problem of difficult cleaning operation after the algae liquid grows on the wall and the problem of flow-through parts destroying the algae cell structure.

[0005] CN108034567A discloses a lantern tube circulation column type microalgae photosynthetic reactor and a method for cultivating microalgae, comprising a vertical transparent hollow column reactor, the bottom of which is closed and the top is provided with a cover; a coaxial transparent drainage tube is provided inside; the drainage tube is composed of a plurality of hollow spherical shells that are continuously connected in series and interconnected, and presents a lantern string structure that is internally connected from top to bottom, aiming to improve the algae liquid flow field and promote the flash effect. CN109055185A discloses a tangential swirl column type microalgae photosynthetic reactor and a method for using the same. Compared with the traditional airlift column reactor, the device can reduce the mixing time of the algae liquid and the diameter of the bubbles, improve the gas-liquid mass transfer coefficient and the circulation frequency of the microalgae between the light and dark zones, which is beneficial to the photosynthesis of the microalgae and effectively prevents the algae cells from sinking to the bottom. The above two utility models improve the gas-liquid mixing state in the column reactor by changing the hydraulic flow field inside the column reactor, thereby improving the reactor efficiency. However, the internal structure of CN108034567A is too complicated, and it is easy to be difficult to clean the algae liquid after it grows on the wall during actual use. CN109055185A has high requirements for hydraulic and aeration control accuracy, and the application effect is reduced after the internal pipeline is blocked, and it is difficult to clear the internal components, and it is still difficult to eradicate the problem of algae liquid growing on the wall. CN207713715U discloses an array column photoreactor unit and a microalgae cultivation system containing the unit. The device has a plurality of columns evenly arranged along the length direction on the connecting box body, and each column is sealed and plugged with the connecting box body respectively. One end of each column is located in the connecting box body, and the other end is provided with an upper cover. However, the utility model cannot solve the problem that the algae liquid is difficult to clean after it grows on the wall, and there is a dead zone for the flow of algae liquid, and the algae liquid is easy to rot and deteriorate inside the reactor. In addition, in addition to the above-mentioned problems, the circulation power of the above patents is a water pump, and there is shear force in the flow-through parts, which affects the growth of microalgae.

[0006] CN206799614U discloses a microalgae cultivation device that uses air buoyancy and gravity to control the circulation direction. The entire pipeline of the device has the same diameter, no valves, no dead corners, and is powered by a vacuum pump. The entire cycle is free of shear force. CN206289246U discloses a vacuum tube photosynthetic reactor. The device uses a vacuum tube glass tube as the reactor body. Even when the external temperature is low, the internal temperature of the reactor can be kept constant. Protein separation technology is used to separate free proteins in the algae liquid in time. The above two utility models both take into account the use of driving gas as a medium to avoid the shear force of the water pump flow components from damaging the growth of microalgae. However, there are certain difficulties in the production and manufacturing of the spiral pipeline in the device of CN206799614U, and the cleaning process is still difficult. In addition, the vacuum extraction of algae liquid is difficult to control and the vacuum pump is prone to contamination. However, CN206289246U is not suitable for large-scale production and practical use, and the problem of easy contamination of the vacuum pump will also occur.

[0007] In summary, developing a column-type photoreactor that is easy to clean, has fewer flow-through parts, and has high carbon fixation efficiency is a key issue in promoting microalgae carbon fixation technology. Utility Model Content

[0008] In view of the shortcomings of the prior art, the utility model provides a column-type microalgae photobioreactor, which uses a vacuum pump as the driving force and is equipped with multiple buffer containers. It avoids the shear force of the water pump flow components and the contamination of the vacuum pump that affects the continuous operation of the system, effectively solving the pain points of traditional column-type microalgae photoreactors in the application process. While retaining the advantage of high carbon fixation efficiency of the column-type reactor, it solves the problems of difficulty in cleaning the column-type reactor and the easy destruction of microalgae growth by the water pump.

[0009] The utility model is realized by the following technical solutions:

[0010] A column-type microalgae photobioreactor, comprising a vacuum pump, a buffer tank, a reactor, a bracket, an algae liquid storage tank and a central control device; the vacuum pump is connected to the buffer tank and the reactor in sequence through a pipeline, the reactor is erected on the algae liquid storage tank through a bracket, and the central control device is connected to and controls each device;

[0011] The reactor comprises a gas main pipe, a gas pipeline, an algae liquid overflow reflux pipe, an overflow vacuum chamber, a lifting mechanism, a reactor body, an electromagnet, a reactor cleaning plate, a reactor overflow pipe, an algae liquid inlet pipe, an aeration pipe and a reactor suction and downpipe; one end of the gas main pipe is connected to the buffer tank, and the other end thereof is connected to the gas pipeline; both ends of the gas pipeline are respectively connected to the tops of two overflow vacuum chambers, and the overflow vacuum chambers are spherical buffer devices; the reactor body is a tubular structure, and the number is more than one, and the top ends of several reactor bodies are connected to the reactor overflow pipe, and the bottom ends thereof are connected to the algae liquid inlet pipe; the sides of the two overflow vacuum chambers are connected by The reactor body is connected with an overflow pipe, and the bottoms of the two overflow vacuum chambers are connected to the algae liquid overflow reflux pipe; one end of the algae liquid overflow reflux pipe is connected to the overflow vacuum chamber, and the other end thereof extends into the algae liquid storage tank; the lifting mechanism is arranged on the top beam of the bracket, and the electromagnet is suspended under the lifting mechanism through an electromagnet steel cable; a reactor cleaning tray is arranged in the reactor body, and the reactor cleaning tray is lifted and lowered in the reactor body by the traction of the electromagnet; the aeration pipeline is a hose with a self-sealing structure, which is arranged at the bottom end of the reactor body; the algae liquid inlet pipe is connected to the reactor suction and downpipe, and the bottom end of the reactor suction and downpipe is located in the algae liquid storage tank.

[0012] Preferably, the cache tank includes a cache tank body, a vacuum pump exhaust pipe, a vacuum breaking valve, an exhaust valve and a reactor exhaust pipe; a vacuum breaking valve is provided on the top of the cache tank body, and an exhaust valve is provided on the bottom; the cache tank body is connected to the vacuum pump and the reactor through the vacuum pump exhaust pipe and the reactor exhaust pipe respectively.

[0013] Preferably, the reactor cleaning disc comprises a cleaning disc fixing cable through hole, a cable cleaning sponge, a liquid flow hole, a reactor cleaning sponge, an iron ring, a support and a threading seam; the reactor cleaning disc forms a steering wheel-like structure through the support, and a cleaning disc fixing cable through hole is provided at the center of the reactor cleaning disc; a cleaning disc fixing cable is suspended on the top of the reactor body, one end of the cleaning disc fixing cable is fixed to the top of the reactor body, and the other end thereof passes through the cleaning disc fixing cable through hole and is connected thereto; the cable cleaning sponge is arranged on the inner circle of the cleaning disc fixing cable through hole; the liquid flow hole is a hollowed-out area in the middle of the reactor cleaning disc; the reactor cleaning sponge is arranged on the outer circle of the reactor cleaning disc; the iron ring is embedded in a circle of the disc body of the reactor cleaning disc and is fixed on the support; the threading seam is a crack extending from the cleaning disc fixing cable through hole to the outer circle of the reactor cleaning disc, which is used for the cleaning disc fixing cable to enter and exit.

[0014] Preferably, a cleaning disc cleaning joint is provided at the bottom end of the reactor body at the connection with the algae liquid inlet pipeline.

[0015] Preferably, the reactor body and each pipeline are fixed to the bracket by a pipeline clamp.

[0016] Preferably, the inner diameter of the reactor body is 90 mm and the height is 3500 mm.

[0017] Preferably, the gas main pipe is provided with a gas pipeline main valve; the algae liquid inlet pipeline is provided with an algae liquid valve, and the algae liquid valve is connected to the reactor suction and downpipe; the algae liquid overflow and reflux pipe is provided with an algae liquid overflow and reflux valve.

[0018] Preferably, it also includes an algae liquid external drainage pump, which is a water draining pump for the algae liquid storage tank, and its water inlet pipeline is arranged in the algae liquid storage tank.

[0019] Preferably, the total height of the algae liquid storage tank is 400 mm and the volume is 500 L.

[0020] Preferably, the central control device is a control cabinet, which is equipped with start and stop switches of various devices and a PLC control system.

[0021] The beneficial effects of the utility model are as follows:

[0022] The column-type microalgae photobioreactor of the utility model adopts electromagnetic force as the energy source for cleaning the reactor. At the same time, by designing a multi-safety gas path structure, it avoids the shear force of the water pump flow components on the microalgae and avoids the operation risk of the vacuum pump sucking in the algae liquid and contamination. Compared with the prior art, the main advantages of the reactor of the utility model are: 1) The online cleaning process of the inner wall of the reactor is efficient and controllable through the independently designed reactor cleaning plate and the electromagnetic force, which effectively solves the problem of the difficulty in cleaning the column-type reactor; 2) The reactor cleaning plate is designed with a disassembly joint, and the cleaning plate can be taken out and offline for in-depth cleaning; 3) By designing proprietary overflow vacuum bins and buffer tanks and other structures, the algae liquid level can be raised and lowered safely and controllably under low shear force. The reactor of the utility model is equipped with an external light source as a supplementary light source, and natural sunlight is used as the main light source for photosynthesis. After application, the microalgae carbon fixation efficiency under continuous operation can be achieved to be greater than 30g / m 2 / d. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a column-type microalgae photobioreactor;

[0024] Figure 1 In: 1. Vacuum pump; 2. Buffer tank; 3. Gas pipeline main valve; 4. Cleaning disk cleaning joint; 5. Bracket; 6. Gas pipeline main pipe; 7. Algae liquid overflow return pipe; 8. Overflow vacuum chamber; 9. Lifting mechanism; 10. Pipe clamp; 11. Reactor body; 12. Electromagnet steel cable; 13. Cleaning disk fixing cable; 14. Electromagnet; 15. Reactor cleaning disk; 16. Aeration pipeline; 17. Control cabinet; 18. Reactor suction and downpipe; 19. Algae liquid storage tank; 20. Algae liquid valve; 21. Algae liquid overflow return valve; 22. Algae liquid external drainage pump; 23. Gas pipeline; 24. Reactor overflow pipe; 25. Algae liquid inlet pipeline;

[0025] Figure 2 It is a schematic diagram of the structure of the cache tank;

[0026] Figure 2 Middle: 2-1, buffer tank body; 2-2, vacuum pump exhaust pipe; 2-3, vacuum breaking valve; 2-4, drain valve; 2-5, reactor exhaust pipe;

[0027] Figure 3 It is a schematic diagram of the structure of the reactor cleaning plate;

[0028] Figure 3 In the figure: 15-1, cleaning plate fixing steel cable passing hole; 15-2, steel cable cleaning sponge; 15-3, liquid flow hole; 15-4, reactor cleaning sponge; 15-5, iron ring; 15-6, support; 15-7, threading seam. DETAILED DESCRIPTION

[0029] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Photobioreactor: refers to a type of device that can be used for the culture of photosynthetic microorganisms and their photosynthetic tissues or cells.

[0031] Microalgae: refers to the general term for microorganisms that contain chlorophyll a and can perform photosynthesis. It is a type of photosynthetic autotrophic microorganism with a small size and simple structure, and is a type of protist. It can use sunlight, CO2 and other nutrients to proliferate and grow rapidly, and can synthesize a large amount of organic matter in its cells.

[0032] Example 1

[0033] A column-type microalgae photobioreactor, such as Figure 1 As shown, it includes a vacuum pump 1, a buffer tank 2, a reactor, a bracket 5, an algae liquid storage tank 19 and a central control device; the vacuum pump 1 is connected to the buffer tank 2 and the reactor in sequence through a pipeline, the reactor is erected on the algae liquid storage tank 19 through the bracket 5, and the central control device is connected to and controls each device.

[0034] The vacuum pump 1 is disposed on the ground and fixed to the ground by bolts. In this embodiment, the vacuum degree of the vacuum pump 1 is required to be at least 50-100 Pa.

[0035] The bracket 5 is used as the overall support of the reactor, which is set on the ground and has multiple support legs to ensure the stability of the reactor. It is made of aluminum alloy and connected by nailing and welding. The total height is 4500mm.

[0036] The algae liquid storage tank 19 is set on the ground with a gentle slope at the bottom. It is a storage container for the algae liquid. It is made of PVC, has a total height of 400mm, and a volume of about 500L.

[0037] The central control device in this embodiment is a control cabinet 17, which is equipped with start and stop switches of various (electrical) equipment and a PLC control system. The control cabinet 17 is an outdoor type control.

[0038] like Figure 1As shown, the reactor includes a gas main pipe 6, a gas pipeline 23, an algae liquid overflow reflux pipe 7, an overflow vacuum chamber 8, a lifting mechanism 9, a reactor body 11, an electromagnet 14, a reactor cleaning plate 15, a reactor overflow pipe 24, an algae liquid inlet pipe 25, an aeration pipe 16 and a reactor suction and downpipe 18; one end of the gas main pipe 6 is connected to the buffer tank 2, and the other end thereof is connected to the gas pipeline 23; both ends of the gas pipeline 23 are respectively connected to the tops of two overflow vacuum chambers 8; the reactor body 11 is a tubular structure, and the number is more than one, and the top ends of several reactor bodies 11 are all connected to the reactor overflow pipe 24, and the bottom ends thereof are all connected to the algae liquid inlet pipe 25; the sides of the two overflow vacuum chambers 8 are connected by the reactor overflow pipe 2 4 is connected, the bottoms of the two overflow vacuum bins 8 are connected to the algae liquid overflow reflux pipe 7; one end of the algae liquid overflow reflux pipe 7 is connected to the overflow vacuum bin 8, and the other end thereof extends into the algae liquid storage tank 19; the lifting mechanism 9 is arranged on the top beam of the bracket 5, and the electromagnet 14 is suspended below the lifting mechanism 9 through the electromagnet steel cable 12; a reactor cleaning tray 15 is arranged in the reactor body 11, and the reactor cleaning tray 15 is pulled up and down in the reactor body 11 by the electromagnet 14; the aeration pipeline 16 is a hose with a self-sealing structure, which is arranged at the bottom end of the reactor body 11; the algae liquid inlet pipeline 25 is connected to the reactor suction and downpipe 18, and the bottom end of the reactor suction and downpipe 18 is located in the algae liquid storage tank 19.

[0039] The gas main pipe 6 serves as a gas pipeline connecting the reactor body 11 and the buffer tank 2. It is made of galvanized steel pipe, connected by welding, and has various specifications to match the buffer tank 2, the reactor and the valve.

[0040] The algae liquid overflow reflux pipe 7 is a gravity pipe connected to the overflow vacuum chamber 8, and its material is PVC and the specification is DN75.

[0041] The overflow vacuum chamber 8 is a spherical buffer device, connected to the gas pipeline 23, the reactor overflow pipe 24, and the algae liquid overflow reflux pipe 7. It is made of stainless steel with a pressure resistance greater than 500 kPa.

[0042] The lifting mechanism 9 is fixed to the top beam of the bracket 5, and there are two of them. The wire rope / cable wound on the drum can drive the hook device to rise or fall. The driving mode is motor drive, and the motor power is 2.5kW.

[0043] The reactor body 11 needs to have high transparency and is the main place for photosynthesis of microalgae. It has an inner diameter of 90 mm and a height of 3500 mm and is made of high-transmittance borax glass.

[0044] The electromagnet 14 is connected to the electromagnet cable 12 as the lifting power source of the reactor cleaning plate 15, and its magnetic force reaches 100N / cm 2 The electromagnet steel cable 12 is used as a hanger for the electromagnet 14 and is made of high-strength steel with a maximum tensile force of 100 kg.

[0045] The aeration pipeline 16 is in the form of a hose, connected to the reducer and reducer at the bottom of the main reactor. The aeration pipeline 16 is provided with a self-sealing structure to ensure sealing before the external pipeline is inserted. The aeration pipeline 16 is made of PE and has a specification of Φ10.

[0046] The reactor water suction and drainage pipe 18 is connected to the reactor body 11 and is the water inlet and outlet pipe of the reactor. The material of the pipe is PVC and the specification matches the equipment.

[0047] like Figure 1 , 2 As shown, the cache tank 2 includes a cache tank body 2-1, a vacuum pump exhaust pipe 2-2, a vacuum breaking valve 2-3, an exhaust valve 2-4 and a reactor exhaust pipe 2-5; a vacuum breaking valve 2-3 is provided on the top of the cache tank body 2-1, and an exhaust valve 2-4 is provided on the bottom; the cache tank body 2-1 is connected to the vacuum pump 1 through the vacuum pump exhaust pipe 2-2, and is connected to the gas main pipe 6 of the reactor through the reactor exhaust pipe 2-5.

[0048] The cache tank 2 is set on the ground and fixed to the ground by bolts. Its function is to prevent liquid from being sucked into the vacuum pump 1 through the pipeline and damaging the equipment. In this embodiment, the cache tank body 2-1 is required to be made of cast iron with a pressure resistance greater than 500kPa.

[0049] like Figure 1 , 3As shown, the reactor cleaning disk 15 includes a cleaning disk fixing cable through hole 15-1, a cable cleaning sponge 15-2, a liquid flow hole 15-3, a reactor cleaning sponge 15-4, an iron ring 15-5, a support 15-6 and a threading seam 15-7; the reactor cleaning disk 15 forms a steering wheel-like structure through the support 15-6, and a cleaning disk fixing cable through hole 15-1 is provided at the center of the reactor cleaning disk 15; a cleaning disk fixing cable 13 is suspended from the top of the reactor body 11, one end of the cleaning disk fixing cable 13 is fixed to the top of the reactor body 11, and the other end thereof (cleaning disk fixing cable 13) passes through the cleaning sponge 15-4. The washing disc fixing steel cable passes through the hole 15-1 and is connected thereto (the washing disc fixing steel cable passes through the hole 15-1); the steel cable cleaning sponge 15-2 is arranged on the inner circle of the washing disc fixing steel cable passing through the hole 15-1; the liquid flow hole 15-3 is the middle hollow area of ​​the reactor washing disc 15; the reactor cleaning sponge 15-4 is arranged on the outer circle of the reactor washing disc 15; the iron ring 15-5 is embedded in a circle of the disc body of the reactor washing disc 15 and is fixed on the support 15-6; the threading seam 15-7 is a crack extending from the washing disc fixing steel cable passing through the hole 15-1 to the outer circle of the reactor washing disc 15, which is used for the washing disc fixing steel cable 13 to enter and exit.

[0050] The reactor cleaning tray 15 is a non-standard part, the support 15-6 is made of PE, the iron ring 15-5 is wrapped in the PE support 15-6, the steel cable cleaning sponge 15-2 and the reactor cleaning sponge 15-4 are both detachable structures and clamped by the support 15-6; the installation and removal of the reactor cleaning tray 15 are completed by passing the cleaning tray fixing steel cable 13 through the threading seam 15-7.

[0051] The cleaning tray fixing cable 13 is fixed in the main reactor as a guide for the reactor cleaning tray 15 and is made of stainless steel.

[0052] like Figure 1 As shown, a cleaning plate cleaning joint 4 is provided at the bottom of the reactor body 11 and the connection with the algae liquid inlet pipe 25. The cleaning plate cleaning joint 4 is connected to the upper photoreactor body 11 and the lower algae liquid inlet pipe 25, and is made of PVC with a specification of DN75.

[0053] like Figure 1 As shown, the reactor body 11 and each pipeline are fixed to the support 5 through a pipeline clamp 10. The pipeline clamp 10 is used to fix the main reactor, pipelines, etc. to the support 5, and its material is a stainless steel round clamp.

[0054] like Figure 1As shown, the gas main pipe 6 is provided with a gas pipeline main valve 3; the algae liquid inlet pipeline 25 is provided with an algae liquid valve 20, and the algae liquid valve 20 is connected to the reactor suction and downpipe 18; the algae liquid overflow reflux pipe 7 is provided with an algae liquid overflow reflux valve 21.

[0055] The material of the gas pipeline main valve 3 is cast iron, the valve form is a ball valve, and the specification is DN65.

[0056] The algae liquid valve 20 is connected to the reactor suction and drainage pipe 18 and is used for water inlet and interception of the main reactor. The material of the valve 20 is PVC and the specification is DN75.

[0057] The algae liquid overflow and reflux valve 21 is an algae liquid overflow and reflux pipeline valve, which controls the pressure and liquid flow in the pipeline. It is made of PVC and has a specification of DN75.

[0058] like Figure 1 As shown, the algae liquid external drainage pump 22 is also included. The algae liquid external drainage pump 22 is an emptying water pump for the algae liquid storage tank 19. Its water inlet pipeline is arranged in the algae liquid storage tank 19, and its flow rate is 2m 3 / h, the lift is 10m.

[0059] The operation process of the above-mentioned column-type microalgae photobioreactor is as follows:

[0060] Inoculate the microalgae to be cultivated into the culture solution, mix well and then add it to the algae liquid storage tank 19, then close the main valve 3 of the gas pipeline, close the algae liquid overflow and reflux valve 21, close the algae liquid valve 20, close the vacuum breaking valve 2-3 and the drain valve 2-4, start the lifting mechanism 9, and lower the electromagnet 14 to the cleaning plate cleaning joint 4 through the electromagnet steel cable 12. The electromagnet 14 is not energized, and the aeration pipeline 16 joint has a self-closing joint that will not break the vacuum degree in the reactor. At this time, the reactor is ready, and the following operations are performed:

[0061] 1. The steps for starting and shutting down the reactor are as follows:

[0062] 1) Turn on the vacuum pump 1, check the vacuum degree in the pipeline and the pressure regulating tank through the pressure gauge of the vacuum pump 1, and then turn off the vacuum pump 1 after the vacuum degree reaches below 10kPa;

[0063] 2) Keep other valves and equipment in their states, first open the main valve 3 of the gas pipeline, and wait for the pressure in the pipeline to stabilize;

[0064] 3) Then, the algae liquid valve 20 is opened in sequence, and the inoculated algae liquid enters the reactor body 11 from the algae liquid storage tank 19 under the action of atmospheric pressure;

[0065] 4) After the algae liquid reaches the designed height, the algae liquid valves 20 are closed in sequence, and the algae liquid is now completely filled;

[0066] 5) Then, the vacuum breaking valve 2-3 is opened, and the algae liquid overflow reflux valve 21 is opened to allow the overflowed algae liquid to flow back into the algae liquid storage tank 19. At this time, the pressure in the gas circuit main pipe 6 is restored to atmospheric pressure;

[0067] 6) Connect the aeration gas pipelines to the aeration pipeline 16 respectively, and introduce CO2 to start algae liquid cultivation;

[0068] 7) After the cultivation task for the day is completed, the aeration pipeline 16 is disconnected, and the algae liquid valve 20 is opened accordingly, and the algae liquid flows back into the algae liquid storage tank 19 under the action of gravity.

[0069] 2. The steps for cleaning and shutting down the reactor are as follows:

[0070] 1) After the cultivation is completed, the algae in the algae liquid storage tank 19 are emptied by using the algae liquid external drainage pump 22 and clean water is injected;

[0071] 2) Connect the reactor cleaning tray 15 into the reactor body 11 through the cleaning tray cleaning joint 4, and insert the cleaning tray fixing cable 13 to fix it;

[0072] 3) Repeat the above reactor opening steps to inject clean water from the algae liquid storage tank 19 into the reactor body 11;

[0073] 4) The electromagnet 14 is energized, and at this time, the reactor cleaning plate 15, due to the effect of its own iron ring 15-5, makes the reactor cleaning sponge 15-4 on it closely contact with the inside of the reactor body 11;

[0074] 5) Start the lifting mechanism 9, pull up the electromagnet 14 through the electromagnet steel cable 12, and then the reactor cleaning plate 15 rises with the electromagnet 14, so as to clean the residual substances of algae liquid attached to the wall inside the reactor body 11;

[0075] 6) After thorough cleaning, the electromagnet 14 is powered off and lowered to below the cleaning plate cleaning joint 4;

[0076] 7) Open the cleaning disk cleaning joint 4, take out the reactor cleaning disk 15, and clean it with clean water for later use;

[0077] 8) The algae liquid external drainage pump 22 is used to drain the cleaning waste water in the algae liquid storage tank 19, and the reactor enters the standby state.

[0078] The embodiments described above are only some embodiments of the utility model, not all embodiments. The detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model for which protection is sought, but merely represents selected embodiments of the utility model. The scope of protection of the utility model shall be subject to the scope required by the claims. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work shall fall within the scope of protection of the utility model.

Claims

1. A column-type microalgae photobioreactor, characterized in that: It includes a vacuum pump, a buffer tank, a reactor, a bracket, an algae liquid storage tank and a central control device; the vacuum pump is connected to the buffer tank and the reactor in sequence through a pipeline, the reactor is erected on the algae liquid storage tank through a bracket, and the central control device is connected to and controls each device; the reactor includes a gas main pipe, a gas pipeline, an algae liquid overflow reflux pipe, an overflow vacuum bin, a lifting mechanism, a reactor body, an electromagnet, a reactor cleaning plate, a reactor overflow pipe, an algae liquid inlet pipe, an aeration pipeline and a reactor suction and downpipe; one end of the gas main pipe is connected to the buffer tank, and the other end thereof is connected to the gas pipeline; both ends of the gas pipeline are respectively connected to the tops of two overflow vacuum bins, and the overflow vacuum bin is a spherical buffer device; the reactor body is a tubular structure, and the number is more than one, and the tops of several reactor bodies are connected to the gas pipeline. The ends are connected to the reactor overflow pipe, and the bottom ends are connected to the algae liquid inlet pipe; the sides of the two overflow vacuum chambers are connected through the reactor overflow pipe, and the bottoms of the two overflow vacuum chambers are connected to the algae liquid overflow reflux pipe; one end of the algae liquid overflow reflux pipe is connected to the overflow vacuum chamber, and the other end thereof extends into the algae liquid storage tank; the lifting mechanism is arranged on the top beam of the bracket, and the electromagnet is suspended under the lifting mechanism through the electromagnet steel cable; a reactor cleaning tray is arranged in the reactor body, and the reactor cleaning tray is lifted and lowered in the reactor body by the traction of the electromagnet; the aeration pipeline is a hose with a self-sealing structure, which is arranged at the bottom end of the reactor body; the algae liquid inlet pipe is connected to the reactor suction and downpipe, and the bottom end of the reactor suction and downpipe is located in the algae liquid storage tank.

2. The column-type microalgae photobioreactor according to claim 1, characterized in that: The cache tank includes a cache tank body, a vacuum pump exhaust pipe, a vacuum breaking valve, an exhaust valve and a reactor exhaust pipe; a vacuum breaking valve is provided on the top of the cache tank body, and an exhaust valve is provided on the bottom; the cache tank body is connected to the vacuum pump and the reactor through the vacuum pump exhaust pipe and the reactor exhaust pipe respectively.

3. The column-type microalgae photobioreactor according to claim 1, characterized in that: The reactor cleaning disc comprises a cleaning disc fixing cable through hole, a cable cleaning sponge, a liquid flow hole, a reactor cleaning sponge, an iron ring, a support and a threading seam; the reactor cleaning disc forms a steering wheel-like structure through the support, and a cleaning disc fixing cable through hole is provided at the center of the reactor cleaning disc; a cleaning disc fixing cable is suspended on the top of the reactor body, one end of the cleaning disc fixing cable is fixed to the top of the reactor body, and the other end thereof passes through the cleaning disc fixing cable through hole and is connected thereto; the cable cleaning sponge is arranged on the inner circle of the cleaning disc fixing cable through hole; the liquid flow hole is a hollowed-out area in the middle of the reactor cleaning disc; the reactor cleaning sponge is arranged on the outer circle of the reactor cleaning disc; the iron ring is embedded in a circle of the reactor cleaning disc body and fixed on the support; the threading seam is a crack extending from the cleaning disc fixing cable through hole to the outer circle of the reactor cleaning disc, which is used for the cleaning disc fixing cable to enter and exit.

4. The column-type microalgae photobioreactor according to claim 3, characterized in that: A cleaning disc cleaning joint is provided at the bottom end of the reactor body and at the connection with the algae liquid inlet pipeline.

5. The column-type microalgae photobioreactor according to claim 1, characterized in that: The reactor body and each pipeline are fixed on the bracket through a pipeline clamp.

6. The column-type microalgae photobioreactor according to claim 1, characterized in that: The inner diameter of the reactor body is 90 mm and the height is 3500 mm.

7. The column-type microalgae photobioreactor according to claim 1, characterized in that: The gas main pipe is provided with a gas pipeline main valve; the algae liquid inlet pipeline is provided with an algae liquid valve, and the algae liquid valve is connected to the reactor suction and downpipe; the algae liquid overflow reflux pipe is provided with an algae liquid overflow reflux valve.

8. The column-type microalgae photobioreactor according to claim 1, characterized in that: It also includes an algae liquid external drainage pump, which is a water draining pump for the algae liquid storage tank, and its water inlet pipeline is arranged in the algae liquid storage tank.

9. The column-type microalgae photobioreactor according to claim 1, characterized in that: The total height of the algae liquid storage tank is 400 mm and the volume is 500 L.

10. The column-type microalgae photobioreactor according to claim 1, characterized in that: The central control device is a control cabinet, which is equipped with start and stop switches of various devices and a PLC control system.

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