Green methanol synthesis system based on new energy power generation hydrogen production and air CO2 capture

Abstract

The utility model discloses a green methanol synthesis system based on new energy power generation hydrogen production and air CO2 capture, which belongs to the technical field of methanol synthesis and comprises an air blower, an air CO2 capture device, an electrolysis device, a new energy power generation device, a hydrogen storage tank, a CO2 storage tank, a gas mixing compressor and a methanol synthesis device. The ionic membrane is arranged in the electrolytic tank to divide the electrolytic tank into an anode chamber and a cathode chamber, an anode and a cathode are respectively arranged, the anode and the cathode are both electrically connected with the new energy power generation device, the anode chamber is communicated with the CO2 storage tank, the cathode chamber is communicated with the hydrogen storage tank, the anode chamber and the cathode chamber are both communicated with the air capture CO2 device, and the air capture CO2 device is communicated with the hydrogen storage tank. The hydrogen storage tank and the CO2 storage tank are both communicated with the gas mixing compressor, and the gas mixing compressor is communicated with the methanol synthesis device. According to the utility model, only CO2 is generated by electrolyzing an organic matter solution and carbonate through the anode chamber, so that the gas separation cost is reduced, the adsorption rate of CO2 is improved, and the cost of air carbon capture is further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of methanol synthesis, and particularly relates to a green methanol synthesis system based on hydrogen production by new energy power generation and CO2 capture from air. Background Technique

[0002] Global warming is an important environmental problem faced by mankind at present, and carbon dioxide emissions are the main greenhouse gases. Industrial production is an important link in carbon dioxide emissions. Therefore, the concepts of carbon peak and carbon neutrality have been put forward in China and the world. Direct air carbon capture (DAC) is an important part of CCUS technology, and has broad application prospects in the future. Carbon dioxide and hydrogen are important raw materials for synthesizing methanol. In the prior art, both direct air carbon capture (DAC) and hydrogen production by electrolyzing water have the problem of too high cost. In the prior art, new energy technologies such as solar power generation and wind power generation can reduce carbon emissions and provide clean energy at the same time. And in the prior art, when electrolyzing carbonate, oxygen is generated while CO2 is generated at the anode, and hydrogen is generated at the cathode. The simultaneous generation of hydrogen and oxygen not only easily causes safety accidents, but also the separation of CO2 and oxygen generated at the anode will increase the process and cost; at the same time, when the alkaline solution adsorbs CO2 in the air, since it cannot fully adsorb CO2 in the air, a mixed solution of alkaline solution and carbonate will be obtained, and the utilization rate of CO2 in the air is low. How to further reduce the costs of direct air carbon capture and hydrogen production by electrolyzing water to achieve green methanol synthesis is a problem that needs to be solved by those skilled in the art. Summary of the Utility Model

[0003] In view of this, the utility model provides a green methanol synthesis system based on hydrogen production by new energy power generation and CO2 capture from air to solve the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A green methanol synthesis system based on hydrogen production by new energy power generation and CO2 capture from air, comprising: a blower, an air CO2 capture device, an electrolysis device, a new energy power generation device, a hydrogen storage tank, a CO2 storage tank, a gas mixing compressor and a methanol synthesis device. The blower is connected to the air CO2 capture device through a pipeline. The electrolysis device includes an anode, a cathode, an ion exchange membrane and an electrolytic cell. The ion exchange membrane is disposed in the electrolytic cell to divide the electrolytic cell into an anode chamber and a cathode chamber. The anode is installed in the anode chamber, and the cathode is installed in the cathode chamber. Both the anode and the cathode are electrically connected to the new energy power generation device. The anode chamber is connected to the CO2 storage tank through a pipeline, and the cathode chamber is connected to the hydrogen storage tank through a pipeline. Both the anode chamber and the cathode chamber are connected to the air CO2 capture device. Both the hydrogen storage tank and the CO2 storage tank are connected to the gas mixing compressor, and the gas mixing compressor is connected to the methanol synthesis device;

[0006] The methanol synthesis device includes a methanol synthesis tower, a flash evaporator and a rectification tower. The gas mixing compressor, the methanol synthesis tower, the flash evaporator and the rectification tower are connected in sequence;

[0007] A fourth pipeline is provided on the hydrogen storage tank, and the fourth pipeline is connected to other hydrogen production equipment.

[0008] Further, a first pipeline is provided between the air CO2 capture device and the anode chamber, and a second pipeline is provided between the air CO2 capture device and the cathode chamber. The air CO2 capture device is connected to the anode chamber through the first pipeline, and the air CO2 capture device is connected to the cathode chamber through the second pipeline.

[0009] Further, the air CO2 capture device includes a capture shell and an aeration disk. A third pipeline is provided between the blower and the capture shell. The aeration disk is disposed at the bottom end of the capture shell. The third pipeline passes through the bottom end of the capture shell and is connected to the aeration disk. The first pipeline is connected to the lower part of the capture shell, and the second pipeline is connected to the upper part of the capture shell.

[0010] Further, the air CO2 capture device further includes a liquid suction pump, a liquid suction pipe and an ultrasonic atomization unit. An annular groove is provided on the inner wall of the capture shell. The liquid suction pump is installed on the liquid suction pipe and fixed on the inner wall of the capture shell. The bottom end of the liquid suction pipe is inserted into the alkaline solution in the capture shell, and the top end passes through the bottom wall of the annular groove and is connected to the annular groove. A plurality of the ultrasonic atomization units are uniformly arranged along the circumferential direction at the top end of the flange of the annular groove. The liquid suction end of the ultrasonic atomization unit is inserted into the annular groove, and the atomization output end of the ultrasonic atomization unit is inclined downward.

[0011] Further, the air capture CO2 device further includes a demister, which is installed at the top of the capture housing.

[0012] Further, the air capture CO2 device further includes a CO2 concentration detector, which is installed at the top of the capture housing and above the demister.

[0013] The beneficial effects of the present utility model are as follows:

[0014] In the present utility model, an ion membrane divides the electrolytic cell into an anode chamber and a cathode chamber. A mixture of carbonate and organic matter solution is placed in the anode chamber. Only CO2 is generated during anode electrolysis. Water or alkaline solution is placed in the cathode chamber, and hydrogen is generated during cathode electrolysis, avoiding the generation of oxygen, which not only improves safety but also reduces the separation cost of CO2 and oxygen; since the OH - concentration in the cathode chamber increases and the alkalinity enhances, the alkaline solution in the cathode chamber can be introduced into the capture housing through the second pipeline to participate in the adsorption of CO2. The carbonate generated after adsorption then circulates back into the anode chamber, reducing the CO2 capture cost; at the same time, air enters the capture housing and reacts fully with the alkaline solution through aeration of the bottom aeration disk; and the ultrasonic atomization unit atomizes the alkaline solution in the capture housing, and the unadsorbed CO2 in the air continues to react with the atomized alkaline solution in the space of the capture housing, improving the CO2 capture efficiency. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0016] Figure 1 is a schematic structural diagram of a green methanol synthesis system based on new energy power generation for hydrogen production and air capture of CO2;

[0017] Figure 2 is a schematic structural diagram of the air capture CO2 device;

[0018] Among them, in the figure:

[0019] 1 - Blower, 2 - New energy power generation device, 3 - Hydrogen storage tank, 4 - CO2 storage tank, 5 - Gas mixing compressor, 6 - Anode, 7 - Cathode, 8 - Ion exchange membrane, 9 - Electrolytic cell, 10 - Anode chamber, 11 - Cathode chamber, 12 - First pipeline, 13 - Second pipeline, 14 - Capture shell, 15 - Aeration disc, 16 - Third pipeline, 17 - Liquid suction pump, 18 - Liquid suction pipe, 19 - Ultrasonic atomization unit, 20 - Ring groove, 21 - Demister, 22 - CO2 concentration detector, 23 - Methanol synthesis tower, 24 - Flash evaporator, 25 - Rectification tower, 26 - Fourth pipeline. Detailed implementation mode

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Refer to the attached Figure 1-2 As shown, the present invention provides a green methanol synthesis system based on new energy power generation for hydrogen production and air capture of CO2, including: a blower 1, an air capture CO2 device, an electrolysis device, a new energy power generation device 2, a hydrogen storage tank 3, a CO2 storage tank 4, a gas mixing compressor 5 and a methanol synthesis device. The blower 1 is connected to the air capture CO2 device through a pipeline. The air capture CO2 device adsorbs CO2 in the air and enters the anode chamber 10 in the form of a carbonate solution. The electrolysis device includes an anode 6, a cathode 7, an ion exchange membrane 8 and an electrolytic cell 9. The ion exchange membrane 8 is arranged in the electrolytic cell 9 to divide the electrolytic cell 9 into an anode chamber 10 and a cathode chamber 11. In addition to the carbonate solution introduced from the air capture CO2 device, an organic matter solution needs to be added to the anode chamber 10. The organic matter solution is an organic compound solution such as sugars, alcohols and amines. The cathode chamber 11 contains water, an alkaline solution such as KOH or NaOH; the anode 6 is installed in the anode chamber 10, the cathode 7 is installed in the cathode chamber 11, and both the anode 6 and the cathode 7 are electrically connected to the new energy power generation device 2. The new energy power generation device 2 provides electrical energy to carry out an electrolysis reaction in the electrolytic cell 9. An electrocatalytic organic matter oxidation reaction occurs in the anode chamber 10 to produce bicarbonate and CO2, without generating oxygen, avoiding the simultaneous generation of CO2 and oxygen during anode electrolysis in the prior art, eliminating the CO2 and oxygen separation link, and saving costs; hydrogen and more OH are electrolyzed in the cathode chamber 11 -, increasing the alkaline concentration. The anode chamber 10 is connected to the pipeline of the CO2 storage tank 4, and the cathode chamber 11 is connected to the pipeline of the hydrogen storage tank 3. The CO2 generated in the anode chamber 10 enters the CO2 storage tank 4, and the hydrogen generated in the cathode chamber 11 enters the hydrogen storage tank 3; both the anode chamber 10 and the cathode chamber 11 are connected to the air-capturing CO2 device. The carbonate solution generated by the air-capturing CO2 device enters the anode chamber 10 to provide the carbonate solution, and the more concentrated alkaline solution generated in the cathode chamber 11 enters the air-capturing CO2 device for CO2 adsorption; both the hydrogen storage tank 3 and the CO2 storage tank 4 are connected to the gas mixing compressor 5, and the gas mixing compressor 5 is connected to the methanol synthesis device. CO2 and hydrogen enter the methanol synthesis device through the gas mixing compressor 5 for methanol synthesis.

[0022] Preferably, in one embodiment, a first pipeline 12 is provided between the air-capturing CO2 device and the anode chamber 10, and a second pipeline 13 is provided between the air-capturing CO2 device and the cathode chamber 11. The air-capturing CO2 device is connected to the anode chamber 10 through the first pipeline 12, and the air-capturing CO2 device is connected to the cathode chamber 11 through the second pipeline 13. The carbonate solution generated by the air-capturing CO2 device enters the anode chamber 10 through the first pipeline 12, and the alkaline solution generated in the cathode chamber 11 enters the air-capturing CO2 device.

[0023] Preferably, in one embodiment, the air-capturing CO2 device includes a capturing shell 14 and an aeration disk 15. A third pipeline 16 is provided between the blower 1 and the capturing shell 14. The aeration disk 15 is arranged at the bottom end of the capturing shell 14, and the third pipeline 16 passes through the bottom end of the capturing shell 14 and is connected to the aeration disk 15. The first pipeline 12 is connected to the lower part of the capturing shell 14, and the second pipeline 13 is connected to the upper part of the capturing shell 14. An alkaline solution is contained in the capturing shell 14. In order to improve the adsorption efficiency of the alkaline solution for CO2 in the air, air enters the capturing shell 14 through the aeration disk 15.

[0024] Preferably, in one embodiment, the air CO2 capture device further includes a liquid suction pump 17, a liquid suction pipe 18, and an ultrasonic atomization unit 19. A ring groove 20 is provided on the inner wall of the capture housing 14. The liquid suction pump 17 is installed on the liquid suction pipe 18 and fixed to the inner wall of the capture housing 14. The bottom end of the liquid suction pipe 18 is inserted into the alkaline solution in the capture housing 14, and the top end passes through the bottom wall of the ring groove 20 and communicates with the ring groove 20. A plurality of ultrasonic atomization units 19 are arranged evenly along the circumference at the top of the flange of the ring groove 20. The liquid suction end of the ultrasonic atomization unit 19 is inserted into the ring groove 20, and the atomization output end of the ultrasonic atomization unit 19 is inclined downward. Since air will quickly pass through the alkaline solution, in order to further improve the CO2 adsorption efficiency, the alkaline solution is sucked into the ring groove 20 by the liquid suction pump 17 and the liquid suction pipe 18, and the alkaline solution is atomized by the ultrasonic atomization unit 19. A plurality of ultrasonic atomization units 19 are arranged at equal intervals along the circumference on the ring groove 20, and the atomization output end is inclined downward. The sprayed atomized alkaline solution further contacts the upward flowing air, improving the CO2 adsorption efficiency.

[0025] Preferably, in one embodiment, the air CO2 capture device further includes a demister 21. The demister 21 is installed at the top of the capture housing 14 to prevent the atomized alkaline solution from scattering outside the capture housing 14, causing waste of the alkaline solution.

[0026] Preferably, in one embodiment, the air CO2 capture device further includes a CO2 concentration detector 22. The CO2 concentration detector 22 is installed at the top of the capture housing 14 and is located above the demister 21. Before use, the CO2 concentration in the air in the natural state can be detected first, and then the blower 1 is turned on to introduce air into the capture housing 14 for CO2 adsorption. When the CO2 concentration detector 22 detects that the CO2 concentration in the air flowing out of the demister 21 is the same as the CO2 concentration in the natural state, it means that the alkaline solution in the capture housing 14 has completely reacted and can no longer react with CO2. At this time, the alkaline solution can be added to the capture housing 14.

[0027] Preferably, in one embodiment, the methanol synthesis device includes a methanol synthesis tower 23, a flash evaporator 24, and a rectification tower 25. The gas mixing compressor 5, the methanol synthesis tower 23, the flash evaporator 24, and the rectification tower 25 are connected in sequence. CO2 and hydrogen enter the methanol synthesis tower 23, the flash evaporator 24, and the rectification tower 25 through the gas mixing compressor 5 for methanol synthesis and purification to produce methanol.

[0028] Preferably, in one embodiment, a fourth pipeline 26 is provided on the hydrogen storage tank 3. The fourth pipeline 26 is connected to other hydrogen production equipment. In view of the fact that the ratio of CO2 and hydrogen generated in the electrolytic cell 9 cannot achieve methanol synthesis, sufficient hydrogen is provided through the connection of the fourth pipeline 26 to a new energy electrolytic hydrogen production device.

[0029] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For related parts, reference can be made to the description in the method section.

[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A green methanol synthesis system based on hydrogen production from new energy power generation and CO2 capture from air, characterized in that, Including: a blower (1), an air capture CO2 device, an electrolysis device, a new energy power generation device (2), a hydrogen storage tank (3), a CO2 storage tank (4), a gas mixing compressor (5), and a methanol synthesis device. The blower (1) is connected to the air capture CO2 device through a pipeline. The electrolysis device includes an anode (6), a cathode (7), an ion exchange membrane (8), and an electrolytic cell (9). The ion exchange membrane (8) is disposed in the electrolytic cell (9) to divide the electrolytic cell (9) into an anode chamber (10) and a cathode chamber (11). The anode (6) is installed in the anode chamber (10), and the cathode (7) is installed in the cathode chamber (11). The anode (6) and the cathode (7) are both electrically connected to the new energy power generation device (2). The anode chamber (10) is connected to the CO2 storage tank (4) through a pipeline. The cathode chamber (11) is connected to the hydrogen storage tank (3) through a pipeline. The anode chamber (10) and the cathode chamber (11) are both connected to the air capture CO2 device. The hydrogen storage tank (3) and the CO2 storage tank (4) are both connected to the gas mixing compressor (5), and the gas mixing compressor (5) is connected to the methanol synthesis device; The methanol synthesis device includes a methanol synthesis tower (23), a flash evaporator (24), and a rectifying tower (25). The gas mixing compressor (5), the methanol synthesis tower (23), the flash evaporator (24), and the rectifying tower (25) are connected in sequence; A fourth pipeline (26) is provided on the hydrogen storage tank (3), and the fourth pipeline (26) is connected to other hydrogen production equipment.

2. The green methanol synthesis system based on hydrogen production by new energy power generation and CO2 capture from air according to claim 1, characterized in that, A first pipeline (12) is provided between the air capture CO2 device and the anode chamber (10), and a second pipeline (13) is provided between the air capture CO2 device and the cathode chamber (11). The air capture CO2 device is connected to the anode chamber (10) through the first pipeline (12), and the air capture CO2 device is connected to the cathode chamber (11) through the second pipeline (13).

3. A green methanol synthesis system based on new energy power generation for hydrogen production and air capture of CO2 according to claim 2, characterized in that, The air capture CO2 device includes a capture shell (14) and an aeration disc (15). A third pipeline (16) is provided between the blower (1) and the capture shell (14). The aeration disc (15) is disposed at the bottom end of the capture shell (14). The third pipeline (16) passes through the bottom end of the capture shell (14) and is connected to the aeration disc (15). The first pipeline (12) is connected to the lower part of the capture shell (14), and the second pipeline (13) is connected to the upper part of the capture shell (14).

4. A green methanol synthesis system based on new energy power generation for hydrogen production and air capture of CO2 according to claim 3, characterized in that, The air capture CO2 device further includes a liquid suction pump (17), a liquid suction pipe (18) and an ultrasonic atomization unit (19). A ring groove (20) is provided on the inner wall of the capture shell (14). The liquid suction pump (17) is installed on the liquid suction pipe (18) and fixed on the inner wall of the capture shell (14). The bottom end of the liquid suction pipe (18) is inserted into the alkaline solution in the capture shell (14), and the top end passes through the bottom wall of the ring groove (20) and communicates with the ring groove (20). A plurality of the ultrasonic atomization units (19) are arranged circumferentially and evenly at the top of the flange of the ring groove (20). The liquid suction end of the ultrasonic atomization unit (19) is inserted into the ring groove (20), and the atomization output end of the ultrasonic atomization unit (19) is inclined downward.

5. A green methanol synthesis system based on new energy power generation for hydrogen production and air capture of CO2 according to claim 3, characterized in that, The air capture CO2 device further includes a demister (21). The demister (21) is installed at the top of the capture shell (14).

6. A green methanol synthesis system based on new energy power generation for hydrogen production and air capture of CO2 according to claim 5, characterized in that, The air capture CO2 device further includes a CO2 concentration detector (22). The CO2 concentration detector (22) is installed at the top of the capture shell (14) and is located above the demister (21).

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