Mine microalgae carbon sequestration and emission reduction and resource recycling system

Abstract

The application discloses a kind of mine microalgae carbon fixation and emission reduction and resource recycling system, including microalgae culture and closed pipeline photobioreactor microalgae culture module, CO2 capture and transport module, microalgae harvest and processing module and the like eight modules;The prepared culture medium and CO2 captured by air return lane are injected into closed pipeline photobioreactor by transport pipeline, and closed pipeline photobioreactor is provided with multiple sensors, monitoring data is uploaded to intelligent data analysis and optimization module for analysis and processing and is intelligently adjusted to solution injection and environmental parameters by intelligent monitoring and automatic control module;Collect the combustible gas generated by microalgae anaerobic fermentation, process the microalgae of preliminary screening, filter mine wastewater.The application can realize the efficient culture of mine microalgae, the efficient emission reduction and resource utilization of CO2 in mine air return lane, and the recycling of wastewater, meet the green, low-carbon sustainable development concept, provide a new solution for mine carbon dioxide emission reduction technology field.

Description

Technical Field

[0001] This invention patent belongs to the field of carbon dioxide emission reduction technology, specifically involving a mine microalgae carbon sequestration and emission reduction and resource recycling system. Background Technology

[0002] Against the backdrop of escalating global climate change and environmental pressures, the "dual carbon" goal has become a global consensus, with countries embarking on a journey of carbon reduction and greening. As one of the world's largest carbon emitters, China bears enormous responsibility and pressure for emission reduction. Coal, as a crucial component of China's energy structure, is a key link in achieving the "dual carbon" goal. However, the coal industry has long relied on traditional high-carbon emission production models, facing the dual challenges of environmental protection and economic development. With the expansion of coal mining scale and depth, mine return airways, as an important part of the mine ventilation system, discharge air containing large amounts of carbon dioxide (CO2). This CO2 not only exacerbates the greenhouse effect but also wastes resources. Therefore, how to effectively reduce CO2 emissions in mine return airways and achieve their resource utilization is an urgent problem to be solved in the field of mine ventilation and environmental protection.

[0003] Traditional mine ventilation primarily focuses on air quality and production safety within the mine, with less consideration given to CO2 emission reduction and resource utilization. Currently, although some technologies attempt to capture and store CO2 through chemical or physical methods, these methods often suffer from high energy consumption, high costs, and secondary pollution, making them difficult to promote in practical applications.

[0004] In recent years, microalgae bio-carbon fixation technology in mines has attracted widespread attention due to its high efficiency, environmental friendliness, and sustainability. Microalgae can absorb CO2 through photosynthesis and convert it into organic matter, thereby achieving CO2 emission reduction and resource utilization. However, applying microalgae bio-carbon fixation technology to mine return airways still faces many challenges, such as how to efficiently capture CO2 in mine return airways, how to optimize the growth conditions of microalgae to improve their carbon fixation efficiency, and how to achieve intelligent management of microalgae bio-carbon fixation systems.

[0005] Therefore, this invention aims to propose a mine microalgae carbon sequestration, emission reduction, and resource recycling system. By integrating advanced CO2 capture technology, microalgae cultivation technology, and intelligent management technology, it achieves efficient CO2 emission reduction and resource utilization in mine return airways, providing a new solution in the field of mine carbon dioxide emission reduction technology. Summary of the Invention

[0006] To address the shortcomings of existing carbon dioxide emission reduction technologies in mines, this invention provides a microalgae carbon sequestration and resource recycling system for mines. The aim is to achieve efficient carbon sequestration and reduction of carbon dioxide in mine air through intelligent cultivation of microalgae, effective capture and utilization of CO2, and filtration and recycling of coal mine wastewater. Details are as follows:

[0007] The mine microalgae carbon sequestration, emission reduction and resource recycling system includes a photobioreactor microalgae cultivation module, a CO2 capture and transport module, a high-efficiency photosynthesis promotion module, a microalgae harvesting and processing module, a wastewater treatment and recycling module, an energy recovery and utilization module, an intelligent data analysis and optimization module, and a microalgae cultivation intelligent monitoring and automatic control module.

[0008] The aforementioned photobioreactor microalgae cultivation module and high-efficiency photosynthesis promotion module include a closed-loop pipeline photobioreactor, an OLED flat panel light-emitting plate, a light intensity sensor, a temperature sensor, a CO2 concentration sensor, a constant temperature heater, a pH monitor, a liquid level sensor, an X-shaped fan-bladed stirrer, a bioreactor fold line, a bioreactor outlet, a bioreactor gas outlet, a CO2 inlet, a microalgae inlet, a solenoid valve I, a culture medium inlet pipe, a bioreactor pulley, a microalgae collection and output pipe, a bioreactor gas output pipe, a microalgae filtration device, a stirring impeller, a stirring shaft, filter pores, a container lid, and a microalgae culture medium. The module consists of a culture medium, safety valve I, safety valve II, and safety valve III. It is responsible for designing and optimizing microalgae culture conditions and the structure of the closed-loop photobioreactor to improve microalgae growth rate and CO2 fixation efficiency. By precisely controlling light, temperature, nutrient solution, pH, and other conditions, it provides the optimal growth environment for microalgae. Two OLED flat-panel light-emitting panels are installed at the top front and back of the bioreactor to ensure uniform illumination throughout the culture container, avoiding localized excessive or insufficient light. Light intensity sensors, temperature sensors, CO2 concentration sensors, a constant-temperature heater, a pH monitor, and a liquid level sensor are installed on the side walls of the bioreactor.

[0009] The CO2 capture and transport module includes a CO2 capture device, a ventilation impeller fan, a CO2 adsorption plate, a CO2 capture vent, a CO2 capture output pipeline, and a CO2 storage tank. This module is responsible for efficiently capturing CO2 from the mine return airway and transporting it to a closed-loop photobioreactor through safety valve III. By adopting advanced CO2 capture technology, it achieves efficient separation and enrichment of CO2, ensuring the stability and safety of CO2 during the transport process.

[0010] The wastewater treatment and recycling module includes a wastewater tank, a pressure gauge, wastewater input pipe I, wastewater input pipe II, a circulating water pump, a solenoid valve II, a filter inlet, a biological filter, a fine filter screen, a baffle plate, porous biological filter media, a filter outlet, an output water pipe, a solenoid valve III, a blower, a main air supply pipe, branch air supply pipes, and a filter outlet. This module is responsible for treating and recycling the wastewater generated during microalgae cultivation. Through the biological filter, harmful substances in the wastewater are removed to meet discharge standards. At the same time, the treated wastewater is recycled for microalgae cultivation, achieving water conservation and recycling.

[0011] The microalgae harvesting and processing module and the energy recovery and utilization module include initial screening, drying, extraction, constant temperature shaking in water, high-speed centrifugation, and finally drying of the upper organic phase after centrifugation to obtain surfactants, bio-fertilizers, microalgae oil or other biomass products. When microalgae are cultured in photosynthetic autotrophic and heterotrophic modes, this module is responsible for harvesting and subsequent processing of microalgae. The synergistic part of photosynthetic autotrophic culture enhances aerobic respiration, and heterotrophic culture enhances the Calvin cycle. The microalgae cultured in the mixed nutrient mode has a higher yield.

[0012] The intelligent data analysis and optimization module includes communication cable I, an OMEGA data acquisition instrument, communication cable II, a network switch, an uplink data transmission line, a data processing, analysis and optimization device, and a downlink data transmission line. This module collects and analyzes various data in the system, such as microalgae growth data, CO2 concentration data, and culture liquid level, to monitor and evaluate the system's operating status in real time. Based on the data analysis results, it optimizes and adjusts the system's operating parameters to improve the system's stability and operating efficiency.

[0013] The intelligent monitoring and automatic control module for microalgae cultivation includes an intelligent controller, a main solenoid valve, a servo motor, a dedicated cable, and a communication cable III. This module uses sensors and an automatic control system to monitor key parameters such as light intensity, temperature, and pH value in real time during the microalgae cultivation process. According to the preset control strategy, it automatically adjusts the cultivation conditions to ensure that the microalgae grow in the best condition. Through remote monitoring and fault diagnosis functions, it realizes remote management and maintenance of the system.

[0014] The photobioreactor microalgae cultivation module and the high-efficiency photosynthesis promotion module transmit the data monitored by the light intensity sensor, temperature sensor, CO2 concentration sensor, pH value monitor, and liquid level sensor in the closed pipeline photobioreactor to the intelligent data analysis and optimization module via communication cable I, and upload the processed and optimized monitoring data information to the intelligent monitoring and automatic control module for microalgae cultivation via the downlink data transmission line.

[0015] The closed-loop photobioreactor is foldable and movable, and is made of a transparent material, either reinforced glass or a polymer plastic, with a light transmittance of over 85%. Its dimensions are 3m × 2m × 3m. The OLED flat panel light-emitting plate has a light intensity controlled between 200 and 800 µmol photons / m². -2 s -1 Choose one or both of the blue or red light bands, set 12-16 hours of illumination and 8-12 hours of darkness; the illuminance sensor measurement range is 0-3000 µmol photons / m². -2 s -1 Accuracy reaches ±2%, resolution is 1 µmol photons m -2 s -1 The temperature sensor measures from 5 to 50°C with an accuracy of ±0.1°C and a resolution of 0.01°C. The CO2 concentration sensor measures from 0 to 5000 ppm with an accuracy of ±2% FS (Full Scale) and a response time of less than 90 seconds. The constant temperature heater controls the temperature from 20 to 40°C, maintaining the temperature inside the closed-loop photobioreactor at 20 to 30°C with an accuracy of ±0.5°C and a heating power of 1 to 10 kW. The pH monitor measures from 6 to 8 pH with an accuracy of ±0.01 pH and a resolution of 0.001 pH, maintaining the pH inside the closed-loop photobioreactor at approximately 7. The liquid level sensor monitors from 0 to 2 m; when the liquid level approaches 2 m, the intelligent controller automatically closes the culture medium input pipe using a solenoid valve with an accuracy of ±1 mm and a resolution of 0.1 mm. The X-type fan-blade agitator is 2m long, with a stirring shaft diameter of 40-50mm, a fan blade length of 50-60mm, a width of 90-100mm, and a fan-shaped arc of 20-30°; the bioreactor outlet diameter is 70-80mm; the bioreactor gas outlet diameter is 10-20mm; the CO2 inlet diameter is 20-30mm; the microalgae inlet diameter is 70-80mm; the culture medium inlet pipe diameter is 70-80mm; the microalgae collection and outlet pipe diameter is 70-80mm; and the bioreactor gas outlet pipe diameter is 10-20mm, which outputs along the top of the return air tunnel.

[0016] The microalgae filtration device has a diameter of 0.8m and a height of 1.5m; the stirring impeller is 100mm long, 50mm wide, and has an arc of 10~20°, with a hollowed-out "rice" shape in the middle to allow for better flow of microalgae and better stirring effect; the stirring shaft is 1m long and 40~50mm in diameter; and the filter pore diameter is 20mm.

[0017] The microalgae culture medium is prepared by mixing coal mine wastewater, inorganic salts, and trace element nutrients after treatment by the wastewater treatment and recycling module, according to the BG11 culture medium preparation method. BG11 culture medium is a culture medium specifically used for culturing freshwater cyanobacteria (blue-green algae) and protozoa.

[0018] The CO2 capture and transport module uses an adsorption material to selectively adsorb CO2 from the air in the return airway, followed by high-temperature and high-pressure desorption and collection. The collected CO2 is stored in a CO2 storage tank and injected into a closed-loop photobioreactor through a CO2 inlet. The CO2 capture device has dimensions of 1.5m × 0.5m × 2m. The porous adsorption material arranged on the CO2 adsorption plate is typically MOF. S One of the following: adsorption material, porous carbon material, or fiber adsorption material.

[0019] The biofilter filters wastewater through multiple stages and discharges it to the microalgae culture medium through the filter outlet. The fine filter screen is made of polystyrene microspheres, microporous plastics, or activated carbon. The porous biofilter media is made of biological ceramic granules, porous spherical suspended biofilter media, or mineral porous biofilter media. Due to its special physical and chemical properties, the porous biofilter media can effectively promote the attachment and growth of microorganisms and improve the wastewater treatment efficiency. The blower sends the blown air into the fine filter screen tank and the biofilter media tank through the main air supply pipeline and the branch air supply pipeline.

[0020] After harvesting the microalgae, the processing module and energy recovery and utilization module are used. The drying temperature is 35~45℃, the extractant is petroleum ether-ethanol, the solvent ratio is 2:1, the liquid-to-solid ratio is 1:5, the water is kept at a constant temperature and shaken at 40~45℃ and 220r / min for 12~24h, and then centrifuged at 800~1000rpm for 10min. Then, surfactants, bio-fertilizers or microalgae oil are prepared according to the required biomass product preparation process.

[0021] Data monitored by various sensors in the closed-loop photobioreactor is transmitted to the OMEGA data acquisition instrument via communication cable I. The acquired data is then uploaded to the network switch via communication cable II, and then transmitted to the data processing, analysis and optimization device via the uplink data transmission line. The processed data is then transmitted to the intelligent monitoring and automatic control module for microalgae cultivation via the downlink data transmission line. The data processing, analysis and optimization device includes multiple monitoring software models, each with a modular structure. Each module can independently execute different monitoring function modes to obtain the cultivation status of the entire microbial bioreactor.

[0022] The intelligent controller is connected to solenoid valve I, solenoid valve II, solenoid valve III and the main solenoid valve respectively. It is powered by a servo motor. The intelligent controller has a modular structure and pre-stores operation instructions. It controls the opening and closing degree of liquid delivery and pipeline solenoid valves through digital input and output.

[0023] Compared with the prior art, the present invention has the following innovative features:

[0024] 1. System Integration and Intelligent Management. This invention innovatively integrates multiple processes such as microalgae cultivation, CO2 capture, wastewater treatment, and energy recovery into a single intelligent system, achieving a closed-loop resource recycling process from CO2 capture to microalgae cultivation, harvesting, wastewater treatment, and energy recovery. Through intelligent data analysis and optimization modules, the system can monitor its operating status in real time, automatically adjust operating parameters, optimize system performance, and improve overall operating efficiency and stability.

[0025] 2. Innovative Design of Microalgae Cultivation and Closed-Loop Photobioreactor. This invention employs an innovative closed-loop photobioreactor structure and cultivation condition optimization strategy, improving the growth rate of microalgae and CO2 fixation efficiency. By precisely controlling light, temperature, and nutrient conditions, an optimal growth environment is provided for microalgae, thereby achieving efficient carbon fixation and resource utilization.

[0026] 3. Highly Efficient CO2 Capture and Transport Technology. This invention employs CO2 capture technology, which can efficiently capture CO2 from the mine return airway and transport it to a closed-loop pipeline photobioreactor. This technology not only improves CO2 capture efficiency but also ensures the stability and safety of CO2 during transport, providing a sufficient carbon source for microalgae cultivation.

[0027] 4. Innovation in Wastewater Treatment and Recycling Technology. This invention addresses the wastewater generated during microalgae cultivation by employing a biological filter wastewater treatment and recycling technology. The fine-mesh biological filter effectively removes harmful substances from the wastewater, achieving compliant discharge and recycling, thus conserving water resources and reducing environmental pollution.

[0028] 5. Breakthrough in Energy Recovery and Utilization Technology. This invention achieves a breakthrough in energy recovery and utilization technology. By recovering and utilizing the combustible gas produced by the anaerobic fermentation of microalgae for power generation, which can be used for the system's own consumption or supplied externally, the system's energy consumption is reduced and energy utilization efficiency is improved. Simultaneously, the anaerobic fermentation of microalgae does not destroy the algal oil in the microalgae cells; therefore, the fermented microalgae can be used for algal oil extraction or to prepare desired surfactants and other biomass products. This innovation not only helps reduce system operating costs but also aligns with the concept of green, low-carbon, and sustainable development. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the composition of a mine microalgae carbon sequestration, emission reduction, and resource recycling system;

[0030] Figure 2 This is a schematic diagram of a microalgae cultivation and closed-loop pipeline photobioreactor and a high-efficiency photosynthesis promotion module;

[0031] Figure 3 This is a front cross-sectional view of a microalgae cultivation and filtration device;

[0032] Figure 4 This is a schematic diagram of the CO2 capture and transport module;

[0033] Figure 5 This is a schematic diagram of the wastewater treatment and recycling module;

[0034] Figure 6 This is a schematic diagram of the microalgae harvesting, processing, energy recovery and utilization module;

[0035] Figure 7 It is an intelligent data analysis, optimization, and automatic control module for microalgae cultivation;

[0036] In the diagram, A—microalgae cultivation module of the photobioreactor; B—CO2 capture and transport module; C—high-efficiency photosynthesis promotion module; D—microalgae harvesting and processing module; E—wastewater treatment and recycling module; F—energy recovery and utilization module; G—intelligent data analysis and optimization module; H—intelligent monitoring and automatic control module for microalgae cultivation; 1-1—closed-loop pipeline photobioreactor; 1-2—OLED flat panel light-emitting plate; 1-3—illuminance sensor; 1-4—temperature sensor; 1-5—CO2 concentration sensor; 1-6—constant temperature heater; 1-7—pH monitor; 1-8— Liquid level sensor; 1-9—X-type fan-blade agitator; 1-10—Bioreactor fold line; 1-11—Bioreactor outlet; 1-12—Bioreactor gas outlet; 1-13—CO2 inlet; 1-14—Microalgae inlet; 1-15—Solenoid valve I; 1-16—Cultivation medium inlet pipe; 1-17—Bioreactor pulley; 1-18—Microalgae collection and outlet pipe; 1-19—Bioreactor gas outlet pipe; 1-20—Safety valve I; 1-21—Safety valve II; 1-22—Safety valve III; 2-1—Microalgae filter; 2-2—Agitator impeller; 2-3—Agitator Shaft, 2-4—Filter pores, 2-5—Container lid, 3—Microalgae culture medium, 4-1—CO2 capture device, 4-2—Ventilation impeller fan, 4-3—CO2 adsorption plate, 4-4—Ventilation port of CO2 capture box, 4-5—CO2 capture output pipe, 4-6—CO2 storage tank, 5-1—Wastewater tank, 5-2—Pressure gauge, 5-3—Wastewater input pipe I, 5-4—Wastewater input pipe II, 5-5—Circulating water pump, 5-6—Solenoid valve II, 5-7—Filter inlet, 5-8—Biological filter, 5-9—Fine filter screen, 5-10—Water baffle plate, 5-11—Porous biological filter media, 5- 12—Filter outlet, 5-13—Output water pipe, 5-14—Solenoid valve III, 5-15—Blower, 5-16—Main air supply pipe, 5-17—Branch air supply pipe, 5-18—Filter outlet, 6-1—Communication cable I, 6-2—OMEGA data acquisition instrument, 6-3—Communication cable II, 6-4—Network switch, 6-5—Uplink data transmission line, 6-6—Data processing, analysis and optimization device, 6-7—Downlink data transmission line, 7-1—Intelligent controller, 7-2—Main solenoid valve, 7-3—Servo motor, 7-4—Dedicated cable, 7-5—Communication cable III. Detailed Implementation

[0037] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0038] First, such as Figures 2 to 4As shown, the preparation of microalgae culture medium and CO2 capture and collection were carried out. Two-thirds of the volume of the microalgae culture medium 3 was filled with coal mine wastewater treated by the wastewater treatment and recycling module E, followed by appropriate amounts of NaNO3 (1500 mg / L), K2HPO4 (40 mg / L), and Mg... 2+ and Ca 2+ The high-concentration solution is prepared using powder. After dissolution, the pH of the culture medium needs to be adjusted to approximately 7.1 with 1M HCl solution. It is then filtered through a 0.2μm filter membrane for sterilization to prepare BG11 culture medium. BG11 medium is a culture medium specifically for *Microcystis aeruginosa*, *Microcystis flos*, and *Chlorella* (green algae). The prepared culture medium is injected into the closed-loop photobioreactor 1-1 through culture medium inlet pipe 1-16. CO2 in the return airway is selectively adsorbed using adsorption materials. The porous adsorption material arranged on the CO2 adsorption plate is typically MOF. S One of the following: adsorption material, porous carbon material or fiber adsorption material; ventilation impeller fan 4-2 exhausts CO2-free air to CO2 collection device 4-1; CO2 collection device has specifications of 1.5m×0.5m×2m; CO2 is desorbed and collected by high temperature and high pressure method; the collected CO2 is stored in CO2 storage tank 4-6; and finally injected into closed pipeline photobioreactor through CO2 inlet 1-13.

[0039] Secondly, such as Figure 1 and Figure 5 As shown, microalgae cultivation and microalgae product processing are carried out. In this invention, *Chlorella vulgaris* is selected as the microalgae, which is shade-tolerant, temperature-tolerant, grows rapidly, and has strong environmental adaptability, making it suitable for growth in underground coal mine environments. The selected *Chlorella vulgaris* is injected into a closed-loop photobioreactor 1-1 through microalgae inlet 1-14. The closed-loop photobioreactor 1-1 is made of reinforced glass with a light transmittance of 90%, and its dimensions are 3m × 2m × 3m. The light intensity of the OLED flat panel 1-2 is controlled at 600 µmol photons / m². -2 s -1 Select the blue light band, set 16 hours of light exposure and 12 hours of darkness, and use illuminance sensors 1-3 to measure 1000 µmol photons / m². -2 s -1 Accuracy reaches ±2%, resolution is 1 µmol photons m -2 s -1Temperature sensors 1-4 have a monitoring range of 25~35℃, an accuracy of ±0.1℃, and a resolution of 0.01℃; CO2 concentration sensors 1-5 have a monitoring range of 1000~2000 ppm, and an accuracy of ±2% FS (Full). The system features a scale (scale), a response time of 40 seconds, a constant temperature heater 1-6 with a temperature control range of 20~40℃, maintaining the temperature inside the closed-loop photobioreactor 1-1 at approximately 25℃ with an accuracy of ±0.5℃, a heating power of 5kW, a pH monitor 1-7 with a monitoring range of 6~8pH, an accuracy of ±0.01pH, and a resolution of 0.001pH, maintaining the pH inside the closed-loop photobioreactor 1-1 at approximately 7, a liquid level sensor 1-8 with an upper limit of 2m for monitoring the liquid level, and an intelligent controller 7-1 that automatically closes the culture medium input pipe when the liquid level approaches 2m, an X-shaped fan-blade stirrer 1-9 with a length of 2m, a stirring shaft diameter of 45mm, a fan length of 55mm, a width of 90mm, and a fan arc of 25°, a bioreactor outlet 1-11 with a diameter of 75mm, a bioreactor gas outlet 1-12 with a diameter of 15mm, and CO2 inlet 1-13 and microalgae inlet 1-14 located within the closed-loop photobioreactor. The top of reactor 1-1 has diameters of 25 mm and 70 mm on the same side. The culture medium inlet pipe 1-16 has a diameter of 70-80 mm, the microalgae collection and outlet pipe 1-18 has a diameter of 75 mm, and the bioreactor gas outlet pipe 1-19 has a diameter of 15 mm. The combustible gas produced by the anaerobic fermentation of microalgae is output to the outside of the mine through the top of the return air tunnel. After anaerobic fermentation, the microalgae are recovered through the filter device 2-1. The recovered microalgae are first screened and dried at 40℃ for 12 h. After drying, an extractant is added to the enzymatically hydrolyzed algal powder. The extractant is selected as petroleum ether-ethanol with a solvent ratio of 2:1 and a liquid-to-solid ratio of 1:5. The mixture is shaken in a constant temperature water at 45℃ and 220 r / min for 24 h. Then, it is centrifuged at 1000 rpm for 10 min. Finally, the upper organic phase after centrifugation is dried at 40℃ for 12 h. Then, surfactants, bio-fertilizers, or microalgae oil are prepared according to the required biomass product process.

[0040] Then, as Figure 6As shown, wastewater from the cultivation process and coal mine wastewater are transported to wastewater tank 5-1 through wastewater inlet pipe I 5-3. Pressure gauge 5-2 monitors the water pressure in wastewater tank 5-1 to prevent excessive pressure. Water from wastewater tank 5-1 is then transported to fine filter tank 5-9 through wastewater inlet pipe II 5-4, circulating water pump 5-5, and filter inlet 5-7. Solenoid valve II 5-6 is connected to circulating water pump 5-5 on wastewater inlet pipe II 5-4. After primary filtration in fine filter tank 5-9, the primary filtered water automatically flows into biological filter tank 5-8. After three-stage filtration through porous biological filter media 5-11, impurities and harmful substances in the water are removed. Part of the filtered water is transported to microalgae culture medium 3 through filter drain outlet 5-18, and part of the water is discharged through outlet pipe 5-13 via solenoid valve III. Under the control of 5-14, the air is transported to the wastewater tank 5-1. The blower 5-15 introduces air into the biological filter 5-8 through the main air supply pipeline 5-16 and the branch air supply pipeline 5-17. Solenoid valves II 5-6 and III 5-14 are connected to the main solenoid valve 7-2 to control the water flow in the pipeline and the total water volume in the biological filter.

[0041] Finally, as Figure 7 As shown, data monitored by various sensors in the closed-loop photobioreactor 1-1 is transmitted to the OMEGA data acquisition instrument 6-2 via communication cable I 6-1. The acquired data is then uploaded to the network switch 6-4 via communication cable II 6-3, and then transmitted to the data processing, analysis and optimization device 6-6 via the uplink data transmission line 6-5. The processed data is then transmitted to the intelligent controller 7-1 via the downlink data transmission line 6-7. The intelligent controller 7-1 is connected to solenoid valves I 1-15, II 5-6, and III respectively. 5-14 is connected to the main solenoid valve 7-2 and is powered by the servo motor 7-3. The data processing, analysis and optimization device 6-6 includes multiple monitoring software models. Each software model adopts a modular structure, and each module independently executes different monitoring function modes to obtain the cultivation status of the entire closed pipeline photobioreactor 1-1. The intelligent controller 7-1 has a modular structure and pre-stores operation instructions. It controls the liquid delivery and the opening and closing degree of the pipeline solenoid valve through digital input and output. The data processing, analysis and optimization device 6-6 is set in the return air tunnel with a large space to ensure that the decision analysis process is not affected by external electromagnetic interference.

[0042] In the description of the invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0043] In this invention, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] It should be further noted that the specific embodiments described herein are merely illustrative examples to illustrate the spirit of the invention. Those skilled in the art to which this invention pertains can make various modifications or additions to the described specific embodiments, or use similar methods to substitute them, without departing from the spirit of the invention or the scope defined by the claims.

Claims

1. A mine microalgae carbon sequestration, emission reduction, and resource recycling system, characterized in that, It includes a photobioreactor microalgae cultivation module (A), a CO2 capture and transport module (B), a high-efficiency photosynthesis promotion module (C), a microalgae harvesting and processing module (D), a wastewater treatment and recycling module (E), an energy recovery and utilization module (F), an intelligent data analysis and optimization module (G), and a microalgae cultivation intelligent monitoring and automatic control module (H). The photobioreactor microalgae culture module (A) and the high-efficiency photosynthesis promotion module (C) include a closed-loop pipeline photobioreactor (1-1), a microalgae filtration device (2-1), and a microalgae culture medium (3). The closed-loop photobioreactor (1-1) has OLED flat panel light-emitting plates (1-2) installed at the front and rear of its top. A CO2 inlet (1-13) and a microalgae inlet (1-14) are located on the left side of the top. Safety valves III (1-22) and II (1-21) are installed near the tail end of the CO2 inlet (1-13) and microalgae inlet (1-14), respectively. A light intensity sensor (1-3) and a temperature sensor (1-4) are installed at the rear, and a bioreactor outlet (1-12) is provided. The gas inlet (1-12) is connected to the gas output pipe (1-19) of the bioreactor and a safety valve I (1-20) is installed thereon; a CO2 concentration sensor (1-5) is installed on the upper right side, and a constant temperature heater (1-6) and a pH monitor (1-7) are installed on the lower right side; a liquid level sensor (1-8) is installed on the front side; X-shaped fan-shaped stirring rods (1-9) are installed at both ends inside; a bioreactor fold line (1-10) is set on the bottom axis of symmetry; two bioreactor outlets (1-11) are set on the front right side of the bottom; and bioreactor pulleys (1-17) are installed at the four corners of the bottom. The microalgae filtration device (2-1) is located inside the closed-loop pipeline photobioreactor (1-1). The top is equipped with a container cover (2-5) and connected to a microalgae collection and output pipeline (1-18). The inside is equipped with a stirring shaft (2-3) and connected to an X-shaped fan-bladed stirring impeller (2-2). The outside is equipped with filter pores (2-4). The microalgae culture medium (3) is fed into the closed-loop photobioreactor (1-1) from the left side through the culture medium input pipe (1-16), and a solenoid valve I (1-15) is installed. The CO2 capture and transport module (B) includes a CO2 capture device (4-1); a ventilation impeller fan (4-2) is installed on the rear side of the CO2 capture device (4-1), a CO2 adsorption plate (4-3) is installed inside, a CO2 capture ventilation port (4-4) is set on the front side, and a CO2 storage tank (4-6) is connected to the right side through a CO2 capture output pipe (4-5); the CO2 storage tank (4-6) is connected to the CO2 input port (1-13) to transport the captured CO2 to the closed-loop pipeline photobioreactor (1-1). The wastewater treatment and recycling module (E) includes a wastewater tank (5-1), a biological filter (5-8), and a blower (5-15). The coal mine wastewater treated by the wastewater treatment and recycling module (E) is used to prepare microalgae culture medium (3). The wastewater tank (5-1) is equipped with a pressure gauge (5-2) on top and connected to wastewater input pipe I (5-3); the right side is connected to the biological filter (5-8) through wastewater input pipe II (5-4) and filter inlet (5-7), and is equipped with a circulating water pump (5-5) and solenoid valve II (5-6); the left side of the biological filter (5-8) is connected to the output water pipe (5-13) through filter outlet (5-12) to output water to the wastewater tank (5-1), and is equipped with solenoid valve III (5-14); the interior is divided into four filtration stages by a water baffle plate (5-10), the first stage of filtration is equipped with a fine filter screen (5-9), and the second, third and fourth stages are equipped with porous biological filter media (5-11); the top is equipped with a filter drain outlet (5-18), which is connected to the blower (5-15) through a branch air supply pipe (5-17) and a main air supply pipe (5-16); The microalgae harvesting and processing module (D) and the energy recovery and utilization module (F) will perform initial screening, drying, extraction, water bath constant temperature shaking, and high-speed centrifugation on the microalgae collected from the photobioreactor microalgae culture module (A). The upper organic phase after centrifugation will be dried to obtain surfactants, bio-fertilizers, microalgae oil or other biomass products. The intelligent data analysis and optimization module (G) includes communication cable I (6-1), OMEGA data acquisition instrument (6-2), communication cable II (6-3), network switch (6-4), uplink data transmission line (6-5), data processing analysis and optimization device (6-6), and downlink data transmission line (6-7). The intelligent monitoring and automatic control module (H) for microalgae cultivation includes an intelligent controller (7-1), a main solenoid valve (7-2), a servo motor (7-3), a dedicated cable (7-4), and a communication cable III (7-5). The data monitored by the light intensity sensor (1-3), temperature sensor (1-4), CO2 concentration sensor (1-5), pH value monitor (1-7), and liquid level sensor (1-8) are transmitted to the intelligent data analysis and optimization module (G) via communication cable I (6-1), and the processed and optimized monitoring data information is uploaded to the intelligent monitoring and automatic control module (H) for microalgae cultivation via downlink data transmission line (6-7) to monitor and automatically control the cultivation process of the closed pipeline photobioreactor (1-1).

2. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, The closed-loop photobioreactor (1-1) is foldable and movable, made of glass fiber reinforced plastic (FRP) transparent material with a light transmittance of over 85%, and has dimensions of 3m × 2m × 3m; the OLED flat panel light-emitting plate (1-2) has a light intensity controlled at 200~800 µmol photons / m². -2 s -1 Between these two wavelengths, blue and red light are selected for combined use, with 12-16 hours of illumination and 8-12 hours of darkness; the illuminance sensors (1-3) have a measurement range of 0-3000 µmol photons / m². -2 s -1 Accuracy reaches ±2%, resolution is 1 µmol photons m -2 s -1 The temperature sensors (1-4) have a measurement range of 5~50℃, an accuracy of ±0.1℃, and a resolution of 0.01℃; the CO2 concentration sensors (1-5) have a measurement range of 0~5000 ppm, and an accuracy of ±2% FS (Full). The system has a scale, with a response time of less than 90 seconds; the constant temperature heater (1-6) has a temperature control range of 20~40℃, maintaining the temperature inside the closed-loop photobioreactor (1-1) at 20~30℃ with an accuracy of ±0.5℃ and a heating power of 1~10kW; the pH monitor (1-7) has a monitoring range of 6~8, an accuracy of ±0.01, and a resolution of 0.001, maintaining the pH inside the closed-loop photobioreactor (1-1) at approximately 7; the liquid level sensor (1-8) has a monitoring range of 0~2m, an accuracy of ±1mm, and a resolution of 0.1mm. When the liquid level approaches 2m, the intelligent controller (7-1) will control the solenoid valve I (1-15) to automatically close the culture medium input pipe (1-16); the X-shaped fan-blade stirrer (1-9) has a length of 2m and a stirring shaft diameter of 40~5mm. 0mm, X-shaped fan blades are 50~60mm long, 90~100mm wide, and have a fan arc of 20~30°; the diameter of the bioreactor outlet (1-11) is 70~80mm; the diameter of the bioreactor gas outlet (1-12) is 10~20mm; the diameter of the CO2 inlet (1-13) is 20~30mm, connected to safety valve III (1-22); the diameter of the microalgae inlet (1-14) is 70~80mm, connected to safety valve II (1-21); the diameter of the culture medium inlet pipe (1-16) is 70~80mm; the diameter of the microalgae collection and output pipe (1-18) is 70~80mm; the diameter of the bioreactor gas output pipe (1-19) is 10~20mm, connected to safety valve I (1-20), and outputs along the top of the return airway.

3. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, The microalgae filtration device (2-1) has a diameter of 0.8m and a height of 1.5m; the stirring impeller (2-2) has a length of 100mm, a width of 50mm, an arc of 10~20°, and a hollow "X" shape in the middle; the stirring shaft (2-3) has a length of 1m and a diameter of 40~50mm; the filter pores (2-4) have a diameter of 20mm.

4. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, The microalgae culture medium (3) is prepared by mixing coal mine wastewater, inorganic salts and trace element nutrients after treatment by the wastewater treatment and recycling module (E) according to the BG11 culture medium preparation method.

5. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, The CO2 capture and transport module (B) captures CO2 by selectively adsorbing it from the air in the return airway using an adsorption material, followed by CO2 desorption and collection using a high-temperature, high-pressure method. The CO2 capture device (4-1) has dimensions of 1.5m × 0.5m × 2m. The porous adsorption material arranged on the CO2 adsorption plate (4-3) is selected as MOF. S Adsorbent material MIL-53.

6. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, The biofilter (5-8) filters coal mine wastewater through multiple stages and discharges it to the microalgae culture medium (3) through the filter outlet (5-18); the fine filter screen (5-9) is polystyrene microspheres; the porous biofilter media (5-11) is mineral porous biofilter media.

7. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, After harvesting, the microalgae are processed in the module (D) and the energy recovery and utilization module (F). The drying temperature is 35~45℃, the extractant is petroleum ether-ethanol, the solvent ratio is 2:1, the liquid-to-solid ratio is 1:5, and the microalgae are kept in a water bath at 40~45℃ and 220r / min for 12~24h. Then, they are centrifuged at 800~1000rpm for 10min.

8. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, Data monitored by various sensors in the closed-loop photobioreactor (1-1) is transmitted to the OMEGA data acquisition instrument (6-2) via communication cable I (6-1). The acquired data is uploaded to the network switch (6-4) via communication cable II (6-3), and then transmitted to the data processing, analysis and optimization device (6-6) via the uplink data transmission line (6-5). The processed data is transmitted to the microalgae cultivation intelligent monitoring and automatic control module (H) via the downlink data transmission line (6-7). The data processing, analysis and optimization device (6-6) includes multiple monitoring software models. Each software model adopts a modular structure, and each module can independently execute different monitoring function modes to obtain the cultivation status of the entire closed-loop photobioreactor (1-1).

9. The mine microalgae carbon sequestration, emission reduction, and resource recycling system according to claim 1, characterized in that, The intelligent controller (7-1) is connected to solenoid valve I (1-15), solenoid valve II (5-6), solenoid valve III (5-14) and main solenoid valve (7-2) respectively, and is powered by servo motor (7-3). The intelligent controller (7-1) has a modular structure, with pre-stored operation instructions inside, and controls the opening and closing degree of liquid delivery and pipeline solenoid valves through digital input and output.

Images