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

Abstract

Belonging to the technical field of methanol synthesis, the invention discloses a green methanol synthesis system based on new energy power generation hydrogen production and air CO2 capture, which 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. An organic matter solution and carbonate are electrolyzed through the anode chamber, only CO2 is generated, the oxygen separation cost is reduced, and the air carbon capture cost is further reduced by improving the CO2 adsorption rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of synthetic methanol, and in particular relates to a green methanol synthesis system based on hydrogen production through power generation from new energy sources and CO2 capture from air. Background Art

[0002] Global warming is an important environmental problem currently faced by mankind, and carbon dioxide emissions are the main greenhouse gas. Industrial production is an important link in carbon dioxide emissions, so my country and the world have proposed the concepts of carbon peak and carbon neutrality. Direct air carbon capture (DAC) is an important part of CCUS technology, and its future application prospects are very broad. Carbon dioxide and hydrogen are important raw materials for synthesizing methanol. In the prior art, both direct air carbon capture (DAC) and electrolysis of water to produce hydrogen have the problem of high costs. In the prior art, new energy technologies such as solar power generation and wind power generation can be used to reduce carbon emissions while providing clean energy. And in the prior art, when carbonate is electrolyzed, the anode produces CO2 and oxygen, while the cathode produces hydrogen. The simultaneous production of hydrogen and oxygen is not only prone to safety accidents, but the separation of CO2 and oxygen produced by the anode will also increase the process and cost; at the same time, when the alkaline solution adsorbs CO2 in the air, it cannot fully adsorb CO2 in the air, and 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 cost of direct air carbon capture and water electrolysis to produce hydrogen and achieve green methanol synthesis is a problem that technicians in this field continue to solve. Summary of the invention

[0003] In view of this, the present invention provides a green methanol synthesis system based on new energy power generation and hydrogen production and air CO2 capture, which is used to solve the above problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A green methanol synthesis system based on new energy power generation and air capture of CO2, comprising: a blower, an air capture CO2 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, wherein the blower is connected to the air capture CO2 device pipeline, the electrolysis device comprises an anode, a cathode, an ion membrane and an electrolytic cell, the ion membrane is arranged in the electrolytic cell to separate the electrolytic cell into an anode chamber and a cathode chamber, the anode is installed in the anode chamber, the cathode is installed in the cathode chamber, the anode and the cathode are both electrically connected to the new energy power generation device, the anode chamber is connected to the CO2 storage tank pipeline, the cathode chamber is connected to the hydrogen storage tank pipeline, the anode chamber and the cathode chamber are both connected to the air capture CO2 device, the hydrogen storage tank and the CO2 storage tank are both connected to the gas mixing compressor, and the gas mixing compressor is connected to the methanol synthesis device.

[0006] Furthermore, a first pipeline is provided between the air capture CO2 device and the anode chamber, a second pipeline is provided between the air capture CO2 device and the cathode chamber, the air capture CO2 device is connected to the anode chamber through the first pipeline, and the air capture CO2 device is connected to the cathode chamber through the second pipeline.

[0007] Furthermore, the air CO2 capture device includes a capture shell and an aeration plate, a third pipeline is arranged between the blower and the capture shell, the aeration plate is arranged 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 plate, 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.

[0008] Furthermore, the air capture CO2 device also includes a liquid suction pump, a liquid suction tube 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 tube and fixed on the inner wall of the capture shell. The bottom end of the liquid suction tube is inserted into the alkaline solution of the capture shell, and the top end passes through the bottom wall of the annular groove and is connected with the annular groove. A plurality of ultrasonic atomization units are evenly arranged at the top end of the flange of the annular groove along the circumferential direction. 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 tilted downward.

[0009] Furthermore, the air CO2 capture device also includes a demister, which is installed on the top of the capture shell.

[0010] Furthermore, the air CO2 capture device also includes a CO2 concentration detector, which is installed on the top of the capture shell and located above the demister.

[0011] Furthermore, the methanol synthesis device comprises a methanol synthesis tower, a flash evaporator and a distillation tower, and the gas mixing compressor, the methanol synthesis tower, the flash evaporator and the distillation tower are connected in sequence.

[0012] Furthermore, a fourth pipeline is provided on the hydrogen storage tank, and the fourth pipeline is connected to other hydrogen production equipment.

[0013] The beneficial effects of the present invention are:

[0014] The present invention divides the electrolytic cell into an anode chamber and a cathode chamber by an ion membrane. A mixture of carbonate and organic solution is placed in the anode chamber, and only CO2 is generated during anode electrolysis. Water or an alkaline solution is placed in the cathode chamber, and hydrogen is generated during cathode electrolysis, avoiding the generation of oxygen, thereby improving safety and reducing the cost of separating CO2 and oxygen. Since the OH- concentration in the cathode chamber increases and the alkalinity is enhanced, the alkaline solution in the cathode chamber can be introduced into a capture shell through a second pipeline to participate in the adsorption of CO2, and the carbonate generated after the adsorption is circulated into the anode chamber, thereby reducing the cost of capturing CO2. At the same time, air enters the capture shell and fully reacts with the alkaline solution through the aeration of the bottom aeration plate. In addition, the ultrasonic atomization unit atomizes the alkaline solution in the capture shell, and the CO2 not adsorbed in the air continues to react with the atomized alkaline solution in the space of the capture shell, thereby improving the CO2 capture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of a green methanol synthesis system based on hydrogen production from renewable energy power generation and CO2 capture from air;

[0017] Figure 2 It is a schematic diagram of the structure of the air CO2 capture 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 membrane, 9-electrolytic cell, 10-anode chamber, 11-cathode chamber, 12-first pipeline, 13-second pipeline, 14-capture shell, 15-aeration plate, 16-third pipeline, 17-liquid suction pump, 18-liquid suction tube, 19-ultrasonic atomization unit, 20-ring groove, 21-demister, 22-CO2 concentration detector, 23-methanol synthesis tower, 24-flash evaporator, 25-distillation tower, 26-fourth pipeline. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See attached Figure 1-2As shown, the present invention provides a green methanol synthesis system based on new energy power generation and air capture of CO2, comprising: 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 pipeline, the air capture CO2 device absorbs CO2 in the air and enters the anode chamber 10 in the form of a carbonate solution, the electrolysis device comprises an anode 6, a cathode 7, an ion membrane 8 and an electrolytic cell 9, the ion membrane 8 is arranged in the electrolytic cell 9 to separate the electrolytic cell 9 into an anode chamber 10 and a cathode chamber 11, in addition to the carbonate introduced from the air capture CO2 device, the anode chamber 10 Salt solution, and organic solution need to be added, the organic solution is an organic compound solution such as sugars, alcohols and amines, the cathode chamber 11 is an alkaline solution such as water, KOH or NaOH; 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 electrically connected to the new energy power generation device 2, the new energy power generation device 2 provides electrical energy to enable electrolysis reaction in the electrolytic cell 9, the electrocatalytic oxidation reaction of organic matter in the anode chamber 10 produces bicarbonate and CO2, and no oxygen is produced, which avoids the simultaneous production of CO2 and oxygen by anode electrolysis in the prior art, eliminates the CO2 and oxygen separation link, and saves costs; the cathode chamber 11 electrolysis produces hydrogen and more OH-, which increases the alkaline concentration. The anode chamber 10 is connected to the CO2 storage tank 4 by a pipeline, and the cathode chamber 11 is connected to the hydrogen storage tank 3 by a pipeline. The CO2 produced by the anode chamber 10 enters the CO2 storage tank 4, and the hydrogen produced by the cathode chamber 11 enters the hydrogen storage tank 3; the anode chamber 10 and the cathode chamber 11 are both connected to an air capture CO2 device, and the carbonate solution produced by the air capture CO2 device enters the anode chamber 10 to provide the carbonate solution, and the more concentrated alkaline solution produced by the cathode chamber 11 enters the air capture CO2 device to adsorb CO2; the hydrogen storage tank 3 and the CO2 storage tank 4 are both connected to a gas mixing compressor 5, and the gas mixing compressor 5 is connected to a methanol synthesis device, and CO2 and hydrogen enter the methanol synthesis device through the gas mixing compressor 5 to synthesize methanol.

[0022] In a preferred embodiment, 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. The carbonate solution produced by the air capture CO2 device enters the anode chamber 10 through the first pipeline 12, and the alkaline solution produced by the cathode chamber 11 enters the air capture CO2 device.

[0023] In a preferred embodiment, the air CO2 capture device includes a capture shell 14 and an aeration plate 15, a third pipeline 16 is arranged between the blower 1 and the capture shell 14, the aeration plate 15 is arranged at the bottom of the capture shell 14, the third pipeline 16 passes through the bottom of the capture shell 14 and communicates with the aeration plate 15, the first pipeline 12 communicates with the lower part of the capture shell 14, and the second pipeline 13 communicates with the upper part of the capture shell 14. The capture shell 14 contains an alkaline solution, and in order to improve the adsorption efficiency of the alkaline solution on CO2 in the air, the air enters the capture shell 14 through the aeration plate 15.

[0024] Preferably, in one embodiment, the air CO2 capture device also includes a liquid suction pump 17, a liquid suction pipe 18 and an ultrasonic atomization unit 19. An annular 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 of the capture shell 14, and the top end passes through the bottom wall of the annular groove 20 and is connected with the annular groove 20. A plurality of ultrasonic atomization units 19 are evenly arranged along the circumferential direction at the top end of the flange of the annular groove 20, the liquid suction end of the ultrasonic atomization unit 19 is inserted into the annular groove 20, and the atomization output end of the ultrasonic atomization unit 19 is tilted downward. Since air will pass through the alkaline solution quickly, in order to further improve the adsorption efficiency of CO2, the alkaline solution is sucked into the annular groove 20 by using the suction pump 17 and the suction tube 18, and the alkaline solution is atomized by the ultrasonic atomization unit 19; multiple ultrasonic atomization units 19 are evenly arranged on the annular groove 20 at circumferential intervals, and the atomization output end is inclined downward, so that the sprayed atomized alkaline solution is further in contact with the upward flowing air, thereby improving the adsorption efficiency of CO2.

[0025] In a preferred embodiment, the air CO2 capture device further includes a demister 21, which is installed at the top of the capture shell 14. The demister 21 prevents the atomized alkaline solution from scattering outside the capture shell 14, causing waste of the alkaline solution.

[0026] In a preferred embodiment, the air CO2 capture device further comprises a CO2 concentration detector 22, which is mounted on the top of the capture shell 14 and above the demister 21. Before use, the CO2 concentration in the air under the natural state can be detected first, and then the blower 1 is turned on to pass air into the capture shell 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 under the natural state, it means that the alkaline solution in the capture shell 14 has completely reacted and can no longer react with CO2. At this time, the alkaline solution can be added to the capture shell 14.

[0027] In a preferred embodiment, the methanol synthesis device includes a methanol synthesis tower 23, a flash evaporator 24 and a distillation tower 25, and the gas mixing compressor 5, the methanol synthesis tower 23, the flash evaporator 24 and the distillation tower 25 are sequentially connected. CO2 and hydrogen enter the methanol synthesis tower 23, the flash evaporator 24 and the distillation tower 25 through the gas mixing compressor 5 to synthesize and purify methanol to prepare methanol.

[0028] In a preferred embodiment, a fourth pipeline 26 is provided on the hydrogen storage tank 3, and the fourth pipeline 26 is connected to other hydrogen production equipment; since the ratio of CO2 and hydrogen produced in the electrolytic cell 9 cannot achieve the synthesis of methanol, the fourth pipeline 26 is connected to the new energy electrolytic hydrogen production equipment to provide sufficient hydrogen.

[0029] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0030] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may 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 widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A green methanol synthesis system based on new energy power generation and air CO2 capture, characterized in that: include: 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, wherein the blower (1) is connected to the air capture CO2 device through a pipeline, the electrolysis device comprises an anode (6), a cathode (7), an ion membrane (8) and an electrolysis cell (9), the ion membrane (8) is arranged in the electrolysis cell (9) to separate the electrolysis cell (9) into an anode chamber (10) and a cathode chamber (11), the anode (6) is installed in the anode chamber (10), and the 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) pipeline, the cathode chamber (11) is connected to the hydrogen storage tank (3) pipeline, the anode chamber (10) and the cathode chamber (11) are both connected to the air CO2 capture 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.

2. A green methanol synthesis system based on renewable energy power generation and air CO2 capture 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) via the first pipeline (12), and the air capture CO2 device is connected to the cathode chamber (11) via the second pipeline (13).

3. A green methanol synthesis system based on renewable energy power generation and air CO2 capture according to claim 2, characterized in that: The air CO2 capture device comprises a capture shell (14) and an aeration plate (15); a third pipeline (16) is arranged between the blower (1) and the capture shell (14); the aeration plate (15) is arranged 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 plate (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 renewable energy power generation and air CO2 capture according to claim 3, characterized in that: The air CO2 capture device also includes a liquid suction pump (17), a liquid suction pipe (18) and an ultrasonic atomization unit (19). An annular 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 of the capture shell (14), and the top end passes through the bottom wall of the annular groove (20) and is connected to the annular groove (20). A plurality of ultrasonic atomization units (19) are evenly arranged at the top end of the flange of the annular groove (20) along the circumferential direction. The liquid suction end of the ultrasonic atomization unit (19) is inserted into the annular groove (20), and the atomization output end of the ultrasonic atomization unit (19) is inclined downward.

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

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

7. A green methanol synthesis system based on renewable energy power generation and air CO2 capture according to claim 1, characterized in that: The methanol synthesis device comprises a methanol synthesis tower (23), a flash evaporator (24) and a distillation tower (25), and the gas mixing compressor (5), the methanol synthesis tower (23), the flash evaporator (24) and the distillation tower (25) are connected in sequence.

8. A green methanol synthesis system based on renewable energy power generation and air CO2 capture according to claim 1, characterized in that: The hydrogen storage tank (3) is provided with a fourth pipeline (26), and the fourth pipeline (26) is connected to other hydrogen production equipment.

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