Carbon absorption device for microalgae carbon sequestration

Abstract

The utility model discloses a carbon absorption device capable of being used for microalgae carbon sequestration, and belongs to the technical field of microalgae carbon sequestration. The utility model discloses a carbon absorption device for microalgae carbon sequestration. The carbon absorption device comprises a first reactor and a second reactor, wherein the lower ends of the first reactor and the second reactor are respectively provided with a gas inlet pipeline and a liquid discharge pipe, and the upper ends of the first reactor and the second reactor are respectively provided with a gas outlet; the spraying device is arranged at the upper end of the second reactor; the first liquid inlet is formed in the upper end of the first reactor; the aeration disc is arranged in the first reactor; according to the utility model, the reactors are connected in series, the first reactor adopts a bubbling mode for reaction, the whole process is simple and quick, the cost is lower, the second reactor adopts a spraying mode for secondary reaction, the utilization rate of carbon dioxide is higher, and the final reaction effect is greatly improved through the double-reactor double-mode reasonable series design; and resource waste and production cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of microalgae carbon fixation, in particular to a carbon absorption device that can be used for microalgae carbon fixation. Background Art

[0002] In order to enhance the carbon dioxide absorption capacity of microalgae, people have proposed using sodium bicarbonate solution instead of traditional carbon dioxide gas as a carbon source for microalgae. This method not only improves the utilization efficiency of carbon dioxide by microalgae, but also provides microalgae with a continuous, stable and reliable carbon source. In order to reduce the cost of sodium bicarbonate solution as a carbon source, people usually use a reaction tower as a device for absorbing and capturing carbon sources during the carbon fixation process of microalgae, and use the principle of the reaction between carbon dioxide and sodium carbonate to achieve the recycling of sodium bicarbonate.

[0003] However, the current reaction tower device has the problems of cumbersome operation, time-consuming and labor-intensive, so there is an urgent need to design an efficient carbon absorption device to solve the above problems;

[0004] For example, Chinese patent CN112957902A discloses a system and method for absorbing carbon dioxide from flue gas of a thermal power plant using a caustic soda solution. The system includes a carbon dioxide reaction absorption tower, wherein a bottom gas transmission pipeline with a flue gas inlet is provided at the lower portion of the carbon dioxide reaction absorption tower, and a liquid inlet for inputting a sodium hydroxide solution is provided at the upper portion; the flue gas inlet is connected to a boiler clean flue gas connection pipeline of the thermal power plant, the carbon dioxide reaction absorption tower is connected to a sodium hydroxide feeding system via an absorption liquid supply pipeline, and the carbon dioxide reaction absorption tower is connected to a solution storage tank or a microalgae cultivation tank via a reaction liquid discharge pipeline. The carbon dioxide absorption tower is used to achieve a convective mixing reaction between the sodium hydroxide solution and the flue gas through aeration or spray atomization technology, thereby realizing the conversion of the carbon source;

[0005] However, the above carbon source conversion method has the following shortcomings:

[0006] 1. The existing reaction tower flue gas and absorption liquid are often mixed using a simple spraying process or aeration process, which has a single reaction mode and low reaction efficiency;

[0007] 2. Existing technologies often use manual labor to detect and control various indicators of the reaction tower, with a low degree of automation. Not only is the operation complicated, time-consuming and labor-intensive, but it also cannot ensure the consistency and stability of the reaction, and it is also difficult to achieve a true 24-hour continuous reaction.

[0008] 3. The reaction effect between carbon dioxide and the reaction solution is poor. A small amount of carbon dioxide gas participates in the reaction, but most of the carbon dioxide gas is eventually discharged into the air through the exhaust port, which not only causes waste of resources but also increases production costs. Utility Model Content

[0009] The purpose of the present invention is to solve the problems raised in the above background technology and to propose a carbon absorption device that can be used for carbon fixation in microalgae.

[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0011] A carbon absorption device that can be used for carbon fixation in microalgae comprises: a first reactor and a second reactor; wherein, the lower ends of the first and second reactors are both provided with an air inlet pipe and a liquid discharge pipe, the liquid discharge pipe is provided with an electromagnetic valve, and the upper ends of the first and second reactors are both provided with an air outlet; a spray device is arranged at the upper end of the second reactor; wherein, the liquid discharge pipe on the first reactor is connected to the spray device; a first liquid inlet is arranged at the upper end of the first reactor; an aeration plate is arranged in the first reactor; wherein, the air inlet end of the aeration plate is connected to the air inlet pipe in the first reactor.

[0012] In order to further improve the carbon fixation effect, preferably, an isolation plate is detachably installed on the first reactor, and the isolation plate divides the upper and lower ends of the first reactor into a control cabin and a first reaction cabin. A drive motor is fixedly connected to the control cabin, and a spiral baffle is fixedly connected to the output end of the drive motor. The spiral baffle passes through the isolation plate and is located in the first reaction cabin.

[0013] In order to facilitate the exhaust and liquid inlet of the first reaction chamber, preferably, the air outlet and the first liquid inlet on the first reactor pass through the control chamber and are connected with the first reaction chamber.

[0014] Preferably, a control module is provided in the control cabin.

[0015] In order to improve the contact effect of the spraying, preferably, a second reaction chamber is provided in the second reactor, and material plates are staggeredly arranged on the inner wall of the second reaction chamber.

[0016] In order to promote the spraying carbon fixation effect, preferably, a spray nozzle is provided at the upper end of the material plate, the spray nozzle is fixedly connected to the second reactor, and an external catalyst storage is connected to the spray nozzle.

[0017] Preferably, the cross section of the material plate is sawtooth-wavy.

[0018] In order to facilitate detection of the first reaction chamber and the second reaction chamber, preferably, an ion concentration sensor is provided in each of the first reaction chamber and the second reaction chamber, a liquid level sensor is provided in the first reaction chamber, and a carbon dioxide concentration sensor is provided in the second reaction chamber.

[0019] Preferably, it further comprises a placement rack, which is used to support and fix the first reactor and the second reactor.

[0020] Compared with the prior art, the present invention provides a carbon absorption device that can be used for carbon fixation in microalgae, which has the following beneficial effects:

[0021] The parts not involved in this device are the same as the existing technology or can be implemented by using the existing technology. The utility model adopts a series connection of reactors. The first reactor adopts a bubbling mode for reaction. The whole process is simple and fast with low cost. The second reactor adopts a spray mode for secondary reaction, and the carbon dioxide utilization rate is higher. Through the reasonable series design of dual reactors and dual modes, the final reaction effect is greatly improved, and resource waste and production costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a carbon absorption device for microalgae carbon fixation proposed in the present invention;

[0023] Figure 2 This is a schematic structural diagram of a first reactor of a carbon absorption device for microalgae carbon fixation proposed in the present invention;

[0024] Figure 3 This is a schematic structural diagram of a second reactor of a carbon absorption device for microalgae carbon fixation proposed in the present invention;

[0025] Figure 4 This is a schematic structural diagram of a spiral baffle of a carbon absorption device that can be used for microalgae carbon fixation, as proposed by the utility model.

[0026] In the figure: 1. Placement rack; 2. First reactor; 201. Control cabin; 202. First reaction cabin; 203. First liquid inlet; 3. Second reactor; 301. Spraying device; 302. Second reaction cabin; 4. Isolation plate; 5. Air outlet; 501. Air inlet pipe; 5001. Aeration plate; 502. Drain pipe; 503. Solenoid valve; 6. Drive motor; 601. Spiral baffle; 7. Material plate; 701. Spray nozzle; 8. Control module. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Example 1:

[0029] Reference Figure 1-4A carbon absorption device for microalgae carbon fixation includes: a first reactor 2 and a second reactor 3, both of which are cylindrical tanks made of corrosion-resistant metal. The bottom of the cylindrical tank is in an inverted cone shape, which is convenient for subsequent liquid drainage; wherein, the lower ends of the first reactor 2 and the second reactor 3 are each provided with an air inlet pipe 501 and a liquid discharge pipe 502, and the liquid discharge pipe 502 is provided with a solenoid valve 503; and the upper ends of the first reactor 2 and the second reactor 3 are each provided with an air outlet 5;

[0030] The spray device 301 is disposed at the upper end of the second reactor 3. Specifically, the spray device 301 includes a pump and a spray nozzle. The pump draws the solution from the first reaction chamber 202 and sprays it into the second reaction chamber 302 through the spray nozzle. The drain pipe 502 on the first reactor 2 is connected to the spray device 301. The first liquid inlet 203 is disposed at the upper end of the first reactor 2.

[0031] The aeration plate 5001 is arranged in the first reactor 2; wherein, the air inlet end of the aeration plate 5001 is connected to the air inlet pipe 501 in the first reactor 2, and the air inlet pipe 501 on the first reactor 2 is externally connected to an external carbon dioxide gas source. The air inlet pipe 501 can transport carbon dioxide gas to the aeration plate 5001 and transport the carbon dioxide gas to the first reaction chamber 4 in a blowing manner.

[0032] An isolation plate 4 is detachably mounted on the first reactor 2, and the isolation plate 4 divides the upper and lower ends of the first reactor 2 into a control cabin 201 and a first reaction cabin 202. A drive motor 6 is fixedly connected to the control cabin 201, and a spiral baffle 601 is fixedly connected to the output end of the drive motor 6. The shaft of the drive motor 6 passes through the isolation plate 4 from top to bottom and extends into the first reaction cabin 202. The spiral baffle 601 is located in the first reaction cabin 202. When the drive motor 6 is working, it will drive the spiral baffle 601 to rotate in the first reaction cabin 202.

[0033] The gas outlet 5 and the first liquid inlet 203 on the first reactor 2 pass through the control cabin 201 and are in communication with the first reaction cabin 202 .

[0034] A control module 8 is provided in the control cabin 201 .

[0035] The second reactor 3 is provided with a second reaction chamber 302, Figure 3 Material plates 7 are arranged on the inner wall of the second reaction chamber 302 from top to bottom and left to right; a spray nozzle 701 is provided at the upper end of each material plate 7, and the spray nozzle 701 is fixedly connected to the second reactor 3. The spray nozzle 701 is connected to an external catalyst storage place. Specifically, the catalyst uses carbonic anhydrase, which can improve the reaction rate and reaction effect of sodium carbonate solution and carbon dioxide gas.

[0036] The cross section of the material plate 7 is sawtooth-wave shaped. This design can firstly increase the gas-liquid contact area and contact time; secondly, carbonic anhydrase can be placed on the material plate as a reaction catalyst, thereby greatly improving the final reaction effect.

[0037] Both the first reaction chamber 202 and the second reaction chamber 302 are equipped with ion concentration sensors, which are bicarbonate ion sensors. The first reaction chamber 202 is equipped with a liquid level sensor, and the second reaction chamber 302 is equipped with a carbon dioxide concentration sensor. The ion concentration sensor, the liquid level sensor, and the carbon dioxide concentration sensor will transmit the detection results to the control module 8, and the control module 8 controls the operation of each solenoid valve, pump, and drive motor 6.

[0038] It also includes a placement rack 1, which is used to support and fix the first reactor 2 and the second reactor 3.

[0039] It should be noted that the pipelines of this device are all equipped with electric control valves, which are controlled by the control module;

[0040] When using this device, the following steps are mainly included:

[0041] Step 1: Open the first liquid inlet 203 on the first reactor 2 and feed the sodium carbonate solution into the first reaction chamber 202. The liquid level sensor monitors the liquid level data in the first reaction chamber 202 and transmits the data to the control module 8. When the liquid level reaches a preset value, the control module 8 controls the first liquid inlet 203 to close and stop feeding the liquid.

[0042] Sodium carbonate solution is used as the absorption liquid. Compared with other reaction liquids, this reaction liquid is safe and pollution-free. The sodium bicarbonate generated by the reaction can be used as a carbon source for microalgae to absorb and be recycled.

[0043] Step 2: Open the aeration plate 5001 and simultaneously open the air inlet pipe 501 at the lower end of the first reactor 2 to deliver carbon dioxide gas. The carbon dioxide gas enters the first reaction chamber 202 in a buoyant manner. At this time, the control module 8 controls the drive motor 6 to rotate slowly, and drives the spiral baffle 601 to rotate slowly in the first reaction chamber 202. The spiral baffle 601 can extend the movement distance of the carbon dioxide bubbles from the bottom of the first reaction chamber 202 to the gas outlet 5, thereby increasing the contact time of the gas-liquid reaction, thereby improving the absorption rate of the carbon dioxide gas and reducing waste. When the spiral baffle 601 rotates, on the one hand, the gas-liquid contact time can be further extended, and at the same time, the carbon dioxide bubbles can be fully mixed with the sodium carbonate solution, thereby further improving the reaction efficiency.

[0044] Step 3: The bicarbonate ion sensor detects the bicarbonate ion concentration and uploads it to the control module 8. When the ion concentration data reaches a preset value, the control module 8 controls the air inlet pipe 501 to close, and opens the drain pipe 502 and the solenoid valve 503 on the first reactor 2 to keep the pipeline between the first reaction chamber 202 and the spray device 301 unobstructed;

[0045] Step 4: The control module 8 controls the air outlet 5 on the second reactor 3 and the air inlet pipe 501 at the bottom to open, and delivers high-concentration carbon dioxide gas to the second reaction chamber 302. When the carbon dioxide concentration sensor detects that the concentration reaches a preset value, the air outlet 5 and the air inlet pipe 501 are closed;

[0046] Step 5: The control module controls the spray nozzle 701 to open and spray the carbonic anhydrase catalyst onto the material plate 7. At this time, the spray device 301 is started to spray the solution in the first reaction chamber 202 into the second reaction chamber 302, so that the reaction solution and carbon dioxide gas undergo a secondary reaction;

[0047] The material plate 7 can improve the rate and effect of the secondary reaction;

[0048] Step 6: After the secondary reaction, the control module controls the solenoid valve 503 on the second reactor 2 to open, and the reaction solution after the secondary reaction enters the reaction solution storage through the drainage pipe 502 for subsequent use;

[0049] By using the first reaction tower and the second reaction tower in series for the secondary absorption reaction, since the sodium carbonate solution in the first reaction tower accounts for a high proportion and has a better reaction effect with carbon dioxide, the carbon dioxide bubbling method can be used to complete the initial reaction simply and quickly. After the reaction, most of the sodium carbonate solution in the first reaction chamber 202 is converted into sodium bicarbonate solution. If the bubbling method is continued to be used for the reaction, a large amount of high-concentration carbon dioxide will be discharged into the air, which will greatly reduce the utilization rate of carbon dioxide. Therefore, a solution spraying method is used in the second reactor 3 to fully react with the sealed carbon dioxide, and a catalyst is added, which reduces the waste of carbon dioxide and saves production costs.

[0050] The utility model adopts a reactor series setting. The first reactor adopts a bubbling mode for reaction. The whole process is simple, fast and low in cost. The second reactor adopts a spray mode for secondary reaction. The carbon dioxide utilization rate is higher. Through the reasonable series design of dual reactors and dual modes, the final reaction effect is greatly improved, and resource waste and production costs are reduced.

[0051] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A carbon absorption device that can be used for carbon fixation of microalgae, characterized in that: include: a first reactor (2) and a second reactor (3); The lower ends of the first reactor (2) and the second reactor (3) are both provided with an air inlet pipe (501) and a liquid discharge pipe (502), the liquid discharge pipe (502) is provided with a solenoid valve (503), and the upper ends of the first reactor (2) and the second reactor (3) are both provided with an air outlet (5); A spraying device (301) is provided at the upper end of the second reactor (3); wherein the liquid discharge pipe (502) on the first reactor (2) is connected to the spraying device (301); A first liquid inlet (203) is provided at the upper end of the first reactor (2); an aeration plate (5001), arranged in the first reactor (2); The air inlet end of the aeration plate (5001) is connected to the air inlet pipe (501) in the first reactor (2).

2. The carbon absorption device for microalgae carbon fixation according to claim 1, characterized in that: An isolation plate (4) is detachably mounted on the first reactor (2), the isolation plate (4) dividing the upper and lower ends of the first reactor (2) into a control cabin (201) and a first reaction cabin (202), a drive motor (6) being fixedly connected in the control cabin (201), a spiral baffle (601) being fixedly connected to the output end of the drive motor (6), and the spiral baffle (601) passing through the isolation plate (4) and being located in the first reaction cabin (202).

3. The carbon absorption device for microalgae carbon fixation according to claim 2, characterized in that: The gas outlet (5) and the first liquid inlet (203) on the first reactor (2) pass through the control cabin (201) and are in communication with the first reaction cabin (202).

4. The carbon absorption device for microalgae carbon fixation according to claim 2, characterized in that: A control module (8) is provided in the control cabin (201).

5. The carbon absorption device for microalgae carbon fixation according to claim 2, characterized in that: A second reaction chamber (302) is provided in the second reactor (3), and material plates (7) are staggeredly arranged on the inner wall of the second reaction chamber (302).

6. The carbon absorption device for microalgae carbon fixation according to claim 5, characterized in that: A spray nozzle (701) is provided at the upper end of the material plate (7), and the spray nozzle (701) is fixedly connected to the second reactor (3). The spray nozzle (701) is externally connected to a catalyst storage area.

7. The carbon absorption device for microalgae carbon fixation according to claim 5, characterized in that: The cross section of the material plate (7) is sawtooth-wavy.

8. The carbon absorption device for microalgae carbon fixation according to claim 5, characterized in that: An ion concentration sensor is provided in both the first reaction chamber (202) and the second reaction chamber (302), a liquid level sensor is provided in the first reaction chamber (202), and a carbon dioxide concentration sensor is provided in the second reaction chamber (302).

9. The carbon absorption device for microalgae carbon fixation according to claim 1, characterized in that: It also includes a placement rack (1), which is used to support and fix the first reactor (2) and the second reactor (3).

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