Hydrogen-blended methanol combustion system and process

Abstract

A hydrogen-blended methanol combustion system and process, the hydrogen-blended methanol combustion system comprising a hydrogen pipe (100), a methanol pipe (300), a hydrogen-methanol mixture pipe (200), a combustion-supporting air pipe (400), a combustor (14), a heated body, a first control unit (27) and a second control unit (28). The hydrogen pipe (100) and the methanol pipe (300) are both communicated with the hydrogen-methanol mixture pipe (200); the hydrogen-methanol mixture pipe (200) and the combustion-supporting air pipe (400) are both communicated with the combustor (14); the hydrogen pipe (100) is provided with a first flow meter (10); the methanol pipe (300) is provided with a methanol vaporization device (19) and a second flow meter (25); the hydrogen pipe (100) is provided with a first electric regulating valve (11); the first flow meter (10), the second flow meter (25) and the first electric regulating valve (11) are all connected to the first control unit (27); the hydrogen-methanol mixture pipe (200) is provided with a second electric regulating valve (12); the heated body is provided with a temperature measurer (16); the temperature measurer (16) and the second electric regulating valve (12) are both connected to the second control unit (28).

Description

Methanol-hydrogen blended combustion system and process Technical Field

[0001] The present invention relates to the technical field of kiln combustion systems, and in particular to a methanol-hydrogen-blended combustion system and process. Background Art

[0002] Kilns are high-energy-consuming and high-carbon-emission equipment. In response to the country's dual-carbon policy, the industry is looking for lower-carbon and cleaner energy solutions.

[0003] Methanol and hydrogen are currently popular green renewable energy sources. Hydrogen has a calorific value per unit mass that is 2.6 times that of natural gas, offering advantages such as high calorific value per unit mass, easy and complete combustion, and zero greenhouse gas emissions. Methanol is also a relatively low-cost liquid fuel. Currently, both methanol and hydrogen have drawbacks when used alone in combustion: Methanol has low combustion efficiency and is prone to incomplete combustion when burned directly, while vaporization combustion using self-preheating methods presents challenges such as unstable vaporization, easy flameout, and the release of toxic gases from incomplete combustion. Hydrogen, on the other hand, has issues such as high storage costs, high local temperatures during combustion, a short flame, and a fast combustion rate.

[0004] However, due to the characteristics of hydrogen's fast combustion speed and high combustion temperature, the hydrogen flow rate of existing burners is prone to fluctuations when using hydrogen for combustion, and the ratio of hydrogen to methanol cannot be maintained stable. The combustion temperature is difficult to control. When used in the field of kiln firing, temperature fluctuations are likely to cause product quality to fail.

[0005] In addition, due to the explosive nature of hydrogen, the existing methanol-hydrogen combustion systems / devices are generally unable to stabilize the hydrogen blending ratio well, and sufficient hydrogen flow fluctuation range needs to be reserved. Therefore, only low-proportion hydrogen blending can be carried out, and the effect of improving pollutant emissions is not obvious.

[0006] Therefore, it is necessary to provide a methanol-hydrogen combustion system that can increase and stabilize the hydrogen blending ratio while ensuring safe combustion, improve combustion quality, and reduce carbon emissions.

[0007] Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a methanol-hydrogen-blended combustion system that can increase and stabilize the hydrogen-blended ratio while ensuring safe combustion, thereby improving the combustion quality and reducing carbon emissions.

[0009] To solve the above technical problems, the present invention provides a methanol-hydrogen combustion system, comprising a hydrogen pipeline, a methanol pipeline, a hydrogen-alcohol mixing pipeline, a combustion-supporting air pipeline, a burner, a heated body, a first control unit and a second control unit, wherein the hydrogen pipeline and the methanol pipeline are both connected to the hydrogen-alcohol mixing pipeline, and the hydrogen-alcohol mixing pipeline and the combustion-supporting air pipeline are both connected to the burner;

[0010] The hydrogen pipeline is provided with a first flow meter, the methanol pipeline is provided with a methanol vaporizer and a second flow meter, the methanol vaporizer and the second flow meter are arranged in sequence along the methanol delivery direction, the hydrogen pipeline is provided with a first electric regulating valve, and the first flow meter, the second flow meter, and the first electric regulating valve are all connected to the first control unit;

[0011] The hydrogen-alcohol mixing pipeline is provided with a second electric regulating valve, the heated body is provided with a temperature detector, and the temperature detector and the second electric regulating valve are both connected to the second control unit.

[0012] As an improvement to the above solution, during stable combustion, the volume proportion of hydrogen in the hydrogen-alcohol mixing pipeline is 15-40%.

[0013] As an improvement to the above-mentioned solution, the combustion-supporting air pipeline is provided with a pressure switch, the hydrogen pipeline is provided with a first electromagnetic shut-off valve, and the methanol pipeline is provided with a second electromagnetic shut-off valve. The pressure switch is electrically connected to the first electromagnetic shut-off valve and the second electromagnetic shut-off valve. When the pressure switch measures that the pressure of the combustion-supporting air pipeline reaches a preset value, the first electromagnetic shut-off valve controls the hydrogen pipeline to be conductive, and the second electromagnetic shut-off valve controls the methanol pipeline to be conductive.

[0014] As an improvement to the above solution, a return air duct is further included, the heated body is a kiln, the kiln is connected to the methanol vaporization device through the return air duct, and a smoke exhaust fan is provided on the return air duct.

[0015] As an improvement to the above solution, a flame arrester is provided at one end of the hydrogen-alcohol mixing pipeline connected to the burner; and / or,

[0016] The hydrogen pipeline is provided with a pneumatic relief valve, a leak detection switch and a third electromagnetic shut-off valve, and the third electromagnetic shut-off valve is electrically connected to the leak detection switch.

[0017] As an improvement of the above solution, a purge pipeline is further included, the hydrogen pipeline is connected to the purge pipeline, and the purge pipeline is used to introduce non-combustible gas.

[0018] As an improvement of the above solution, the hydrogen pipeline includes a methanol re-filled hydrogen production device and a hydrogen storage tank, and the pipeline connecting the methanol re-filled hydrogen production device and the hydrogen storage tank is also connected in parallel with a carbon capture device.

[0019] In addition, the present invention also provides a methanol-hydrogen combustion process based on the above-mentioned methanol-hydrogen combustion system, which includes

[0020] In the preheating process, the methanol vaporization device preheats the liquid methanol in the methanol pipeline into gaseous state;

[0021] In the ignition process, combustion air and gaseous methanol are introduced into the burner in sequence and ignited for combustion;

[0022] In the hydrogen blending and heating process, after the combustion-supporting air and gaseous methanol in the burner are stably burned, hydrogen is introduced into the burner to gradually increase the proportion of hydrogen in the hydrogen-alcohol mixing pipeline. After 1.5 to 5 minutes, the volume proportion of hydrogen entering the hydrogen-alcohol mixing pipeline is 15 to 40%;

[0023] During normal operation, the second control unit adjusts the opening of the second electric regulating valve according to the kiln temperature measured by the temperature detector, and the first control unit controls the opening of the first electric regulating valve according to the real-time hydrogen flow measured by the first flow meter and the real-time gaseous methanol flow measured by the second flow meter, so that the volume proportion of hydrogen entering the hydrogen-alcohol mixing pipeline is 15-40%.

[0024] As an improvement to the above scheme, a purging process is also included, in which non-combustible gas is introduced into the hydrogen-alcohol mixing pipeline, the burner and the end of the hydrogen pipeline to discharge the residual gas in the hydrogen pipeline, the hydrogen-alcohol mixing pipeline and the burner.

[0025] As an improvement to the above solution, the normal operation process also includes

[0026] The methanol vaporization device stops preheating, and the kiln introduces kiln flue gas into the methanol vaporization device through the return air duct. The methanol vaporization device exchanges heat with the kiln flue gas to vaporize the methanol.

[0027] The implementation of the present invention has the following beneficial effects:

[0028] The present invention discloses a methanol-hydrogen combustion system. By arranging a methanol vaporization device in a methanol pipeline, gaseous methanol is better mixed with air, and combustion is more complete and efficient, thereby helping to reduce carbon emissions.

[0029] At the same time, a first flow meter is set in the hydrogen pipeline and a second flow meter is set in the methanol pipeline. The flow rates of hydrogen and vaporized methanol are monitored in real time. The first control unit controls the first electric regulating valve to control the proportion of the two in the hydrogen-methanol mixing pipeline. The mixed gas can be stably supplied according to the preset hydrogen blending ratio, and the combustion effect is highly controllable.

[0030] By installing a temperature detector on the kiln and a second electric regulating valve on the hydrogen-alcohol mixing pipeline connecting the methanol pipeline and the hydrogen pipeline, the real-time temperature of the kiln is transmitted to the second control unit by the temperature detector. The second control unit adjusts the flow rate of the mixed gas in the hydrogen-alcohol mixing pipeline by controlling the opening of the second electric regulating valve, thereby controlling the temperature change of the kiln in real time and helping to improve the firing quality.

[0031] As the mixed gas flow rate changes, the flow rates of hydrogen and gaseous methanol also change. The values ​​of the first flow meter of the hydrogen pipeline and the second flow meter of the methanol pipeline will also change, and the gas mixture ratio in the hydrogen-methanol mixed pipeline may fluctuate. The first control unit controls the first electric regulating valve by comparing the ratio of the first flow meter and the second flow meter to ensure the stability of the mixed gas ratio, thereby ensuring that the hydrogen flow rate does not fluctuate significantly and improving safety.

[0032] Since the hydrogen blending ratio can be controlled in real time, the hydrogen blending ratio of the present invention can reach up to about 40%. Compared with the general methanol hydrogen blending combustion system / device that can only perform low-ratio hydrogen blending, the hydrogen blending ratio is greatly improved, and the pollutant emissions are significantly improved.

[0033] The present invention uses methanol mixed with hydrogen to generate a large amount of water vapor during combustion, which can increase the radiation capacity of the flue gas, strengthen the radiation heat exchange between the flue gas and the product, shorten the firing time, and save energy and reduce carbon emissions.

[0034] Methanol has a large latent heat of vaporization. Utilizing the waste heat of flue gas to vaporize methanol increases the sensible heat of methanol, and the amount of heat brought into the kiln also increases, thereby reducing heat consumption and carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is a structural diagram of an embodiment of a methanol-hydrogen combustion system of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] As shown in Figure 1, the present invention provides an embodiment of a methanol-hydrogen combustion system, comprising a hydrogen pipeline 100, a hydrogen-alcohol mixing pipeline 200, and a methanol pipeline 300, as well as a combustion-supporting air pipeline 400, a burner 14, a kiln 15, a first control unit 27, and a second control unit 28. The hydrogen-alcohol mixing pipeline 200 and the combustion-supporting air pipeline 400 are both in communication with the burner 14. The hydrogen pipeline 100 is equipped with a first flowmeter 10, and the methanol pipeline 300 is equipped with a methanol vaporizer 19 and a second flowmeter 25. The methanol vaporizer 19 and the second flowmeter 25 are sequentially arranged along the methanol delivery direction. The hydrogen pipeline 100 is equipped with a first electric control valve 11, and the first flowmeter 10, the second flowmeter 25, and the first electric control valve 11 are all connected to the first control unit 27. The hydrogen-alcohol mixing pipeline 200 is equipped with a second electric control valve 12, and the kiln 15 is equipped with a temperature detector 16. The temperature detector 16 and the second electric control valve 12 are both connected to the second control unit 28.

[0038] In this embodiment, a methanol vaporization device 19 is provided in the methanol pipeline 300 so that the gaseous methanol can be better mixed with the air and burn more fully and efficiently.

[0039] At the same time, a first flow meter 10 is provided in the hydrogen pipeline 100, and a second flow meter 25 is provided in the methanol pipeline 300. The flow rates of hydrogen and vaporized methanol are monitored in real time. The first electric regulating valve 11 is controlled by the first control unit 27 to control the proportion of the two in the hydrogen-methanol mixing pipeline 200. The mixed gas can be stably supplied according to the preset hydrogen blending ratio, and the combustion effect is highly controllable.

[0040] By providing a temperature detector 16 on the kiln 15 and a second electric regulating valve 12 on the hydrogen-alcohol mixing pipeline 200 connecting the methanol pipeline 300 and the hydrogen pipeline 100, the real-time temperature of the kiln 15 is transmitted to the second control unit 28 by the temperature detector 16. The second control unit 28 adjusts the flow rate of the mixed gas in the hydrogen-alcohol mixing pipeline 200 by controlling the opening of the second electric regulating valve 12, thereby controlling the temperature change of the kiln 15 in real time and helping to improve the firing quality.

[0041] Due to the change in the mixed gas flow rate, the flow rates of hydrogen and gaseous methanol will change, and the values ​​of the first flow meter 10 of the hydrogen pipeline 100 and the second flow meter 25 of the methanol pipeline 300 will also change. The gas mixture ratio in the hydrogen-alcohol mixing pipeline 200 may fluctuate. The first control unit 27 controls the first electric regulating valve 11 by comparing the ratio of the first flow meter 10 and the second flow meter 25 to ensure the stability of the mixed gas ratio, thereby ensuring that the hydrogen flow rate does not fluctuate greatly and improving safety.

[0042] In addition, the large amount of water vapor produced by the combustion of gaseous methanol mixed with hydrogen can increase the radiation capacity of the flue gas, thereby enhancing the radiation heat exchange between the flue gas and the product, shortening the firing time, and thus achieving the effect of energy saving and carbon reduction.

[0043] In this embodiment, both the first control unit 27 and the second control unit 28 are PLC control systems, and the temperature detector 16 can be a thermocouple.

[0044] Among them, the hydrogen pipeline 100 of this embodiment also includes a methanol reforming hydrogen production device 1, a hydrogen storage tank 2, a first manual ball valve 3, a first pressure regulating valve 4, a first pressure gauge 5, a third solenoid shut-off valve 6, a pneumatic relief valve 7, a leak detection switch 8, and a first solenoid shut-off valve 9 arranged in sequence.

[0045] The pneumatic relief valve 7 on the hydrogen pipeline 100 automatically releases pressure when the pipeline is over-pressurized, ensuring the pressure safety of the hydrogen pipeline 100. The third electromagnetic shut-off valve 6 is electrically connected to the leak detection switch 8. When the leak detection switch 8 detects a hydrogen leak in the hydrogen pipeline 100, the third electromagnetic shut-off valve 6 is closed, preventing hydrogen leakage and ensuring the safety of the hydrogen pipeline 100 and the surrounding environment.

[0046] The hydrogen in the hydrogen pipeline 100 of this embodiment is produced by a methanol reforming hydrogen production device 1, and a methanol reforming hydrogen production method is adopted. Low-cost methanol is passed through the methanol reforming hydrogen production device 1 to produce hydrogen, which is then mixed with gaseous methanol and burned, thereby realizing the "production and use" of hydrogen and reducing the transportation cost of hydrogen.

[0047] In addition, the combustion of methanol mixed with hydrogen produces a large amount of water vapor, which can increase the radiation capacity of the flue gas, strengthen the radiation heat exchange between the flue gas and the kiln 15 products, shorten the firing time, and save energy and reduce carbon emissions.

[0048] Since methanol hydrogen production basically only produces hydrogen and carbon dioxide, and only carbon dioxide remains after hydrogen separation, in this embodiment, preferably, a carbon capture device 33 is also connected in parallel to the pipeline connecting the methanol re-filling hydrogen production device and the hydrogen storage tank 2 to process the carbon dioxide generated in the methanol hydrogen production process and reduce carbon emissions.

[0049] The methanol pipeline 300 of this embodiment further includes a methanol station 17, a methanol feed pump 18, a chimney 20 connected to a methanol vaporizer 19, and related switching and regulating devices, such as a second manual ball valve 21, a second pressure regulating valve 22, a second pressure gauge 23, and a second electromagnetic shut-off valve 24. The methanol vaporizer 19 is disposed between the methanol feed pump 18 and the second manual ball valve 21.

[0050] In addition to providing methanol to the methanol pipeline 300 , the methanol station 17 can also directly provide methanol as a raw material to the methanol reforming hydrogen production device 1 .

[0051] In this embodiment, a flame arrester 13 is provided at one end of the hydrogen-alcohol mixing pipeline 200 connected to the burner 14 . The flame arrester 13 can prevent the flame in the burner 14 from backfired into the hydrogen-alcohol mixing pipeline 200 .

[0052] The combustion-supporting air line 400 of this embodiment is equipped with a combustion-supporting air blower 30, a pressure switch 31, and a third electric regulating valve 32. The pressure switch 31 is electrically connected to the first electromagnetic shut-off valve 9 and the second electromagnetic shut-off valve 24. When the combustion-supporting air blower 30 is turned on and the pressure switch 31 detects that the pressure in the combustion-supporting air line 400 has reached a preset value, the first electromagnetic shut-off valve 9 and the second electromagnetic shut-off valve 24 are allowed to open.

[0053] First, manually open the second solenoid shut-off valve 24 to open the methanol line 300, allowing the methanol gas to enter the burner 14 and mix with the combustion-supporting air for combustion. This ensures that the combustion-supporting air enters the burner 14 first, ensuring smooth ignition and combustion of the methanol gas. Once the methanol gas is burning steadily, manually open the first electric control valve 11 to open the hydrogen line 100, delivering hydrogen to the hydrogen-methanol mixing line 200. This hydrogen mixes with the methanol gas and burns with the combustion-supporting air in the burner 14.

[0054] It should be noted that the stable combustion mentioned in this embodiment refers to a state in which the combustion heat generated per unit time remains substantially consistent on the basis of continuous and full combustion of the fuel.

[0055] In this embodiment, the methanol-hydrogen combustion system maintains a hydrogen volume ratio of 15-40% in the hydrogen-methanol mixing pipeline during stable combustion. When the kiln is operating normally, the hydrogen volume ratio can be controlled in real time to 28-33%, achieving a high hydrogen mixing ratio and effectively improving pollutant emissions.

[0056] To ensure safe combustion, when the pressure of the combustion-supporting air pipeline has not reached the pressure setting value, the first solenoid shut-off valve 9 and the second solenoid shut-off valve 24 are always in a closed state, and the process of the first solenoid shut-off valve 9 controlling the conduction of the hydrogen pipeline 100, the process of the second solenoid shut-off valve 24 controlling the conduction of the methanol pipeline 300, and the process of the second electric regulating valve 12 controlling the opening of the hydrogen-alcohol mixing pipeline 200 are all manually opened. The first solenoid shut-off valve 9, the second electric regulating valve 12, and the second solenoid shut-off valve 24 are not automatically opened when the pressure of the combustion-supporting air pipeline reaches the preset value.

[0057] The methanol-hydrogen combustion system of this embodiment further includes a return air pipeline 500 . The kiln 15 is connected to the methanol vaporization device 19 via the return air pipeline 500 . A smoke exhaust fan 29 is provided on the return air pipeline 500 .

[0058] Before kiln 15 operates normally, methanol vaporization device 19 is powered on to preheat and vaporize the methanol through electrical heating. Once kiln 15 is operating normally, methanol is vaporized through heat exchange between kiln 15 flue gas and methanol vaporization device 19. This results in stable vaporization, energy recycling, and reduced energy consumption. Furthermore, methanol has a high latent heat of vaporization. Using the waste heat from the flue gas to vaporize the methanol increases the sensible heat of the methanol, thereby increasing the amount of heat introduced into kiln 15 and reducing heat consumption and carbon emissions.

[0059] Since the fluctuation of the combustion-supporting air will have a great impact on the pressure in the kiln 15, causing the quality of the product to decline, and at the same time affecting the vaporization stability of methanol by the methanol vaporization device 19 during normal operation of the kiln 15, the third electric regulating valve 32 of this embodiment is preferably adjusted manually instead of changing simultaneously with the flow rate of the mixed gas, to ensure that the combustion-supporting air pipeline 400 can supply sufficient oxygen for the combustion of hydrogen and methanol under the maximum flow state.

[0060] To further improve combustion safety and ignition stability, the methanol-hydrogen combustion system of this embodiment also includes a purge line 600. The hydrogen line 100 is connected to the purge line 600. The purge line 600 is used to introduce non-combustible gas. A fourth electromagnetic shut-off valve 26 is provided on the purge line 600.

[0061] In addition, the present invention also provides a methanol-hydrogen combustion process based on the above-mentioned methanol-hydrogen combustion system, which includes

[0062] In the purge process, the fourth electromagnetic shut-off valve is opened, and non-combustible gas (such as nitrogen) is introduced into the hydrogen-alcohol mixing pipeline 200, the burner 14, and the end of the hydrogen pipeline 100 through the purge pipeline 600 to discharge the residual gas in the hydrogen pipeline 100, the hydrogen-alcohol mixing pipeline 200, and the burner 14;

[0063] In the preheating process, the methanol vaporization device 19 is energized to preheat the liquid methanol in the methanol pipeline 300 into a gaseous state;

[0064] During the ignition process, the third electric regulating valve 32 is opened, and the combustion-supporting air blower 30 is turned on to first introduce combustion-supporting air into the burner 14. When the pressure switch 31 detects that the pressure of the combustion-supporting air pipeline 400 has reached a preset value, the second electromagnetic shut-off valve 24 controls the methanol pipeline 300 to be open, and gaseous methanol first enters the burner 14 to mix with the combustion-supporting air and ignite and burn.

[0065] In the hydrogen mixing and heating process, after successful ignition, the ratio of gaseous methanol to combustion-supporting air is adjusted. After the combustion-supporting air and gaseous methanol in the burner 14 are stably burned, hydrogen is introduced into the burner 14 to gradually increase the proportion of hydrogen in the hydrogen-alcohol mixing pipeline 200. After 1.5 to 5 minutes, the volume proportion of hydrogen entering the hydrogen-alcohol mixing pipeline 200 is 15 to 40%;

[0066] During normal operation, the second control unit 28 adjusts the opening of the second electric regulating valve 12 according to the temperature of the kiln 15 measured by the temperature detector 16, and the first control unit 27 controls the opening of the first electric regulating valve 11 according to the real-time hydrogen flow measured by the first flow meter 10 and the real-time gaseous methanol flow measured by the second flow meter 25, so that the volume proportion of hydrogen entering the hydrogen-alcohol mixing pipeline 200 is 15-40%.

[0067] When entering the normal operation process, the methanol vaporization device 19 stops preheating, and the kiln 15 introduces the kiln 15 flue gas into the methanol vaporization device 19 through the return air pipeline 500. The methanol vaporization device 19 exchanges heat with the kiln 15 flue gas to vaporize the methanol.

[0068] Due to the explosive nature of hydrogen, existing methanol-hydrogen combustion systems / devices are generally unable to effectively stabilize the hydrogen blending ratio and require a sufficient hydrogen flow fluctuation range to be reserved. Therefore, only low-ratio hydrogen blending can be performed, which does not significantly improve pollutant emissions. However, in this embodiment, the hydrogen blending ratio is controllable in real time, has good stability, and the system is safe and reliable, so the maximum hydrogen blending ratio can reach approximately 40%.

[0069] In this embodiment, when the volume proportion of hydrogen in the hydrogen-alcohol mixing pipeline 200 is stabilized at 30%, it can be calculated based on the calorific value of gaseous methanol and hydrogen and the methanol reforming hydrogen production equation CH4O+H2O=3H2+CO2 that, while ensuring that the total calorific value of the fuel remains unchanged, the methanol fuel usage of the methanol-hydrogen combustion system is reduced by 16.4% compared with the combustion of methanol alone, and the carbon emissions of methanol combustion are reduced by 16.4%, with a very significant emission reduction effect.

[0070] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A methanol-hydrogen combustion system, characterized in that: It includes a hydrogen pipeline, a methanol pipeline, a hydrogen-alcohol mixing pipeline, a combustion-supporting air pipeline, a burner, a heated body, a first control unit and a second control unit, wherein the hydrogen pipeline and the methanol pipeline are both connected to the hydrogen-alcohol mixing pipeline, and the hydrogen-alcohol mixing pipeline and the combustion-supporting air pipeline are both connected to the burner; The hydrogen pipeline is provided with a first flow meter, the methanol pipeline is provided with a methanol vaporization device and a second flow meter, the methanol vaporization device and the second flow meter are sequentially arranged along the methanol conveying direction, the hydrogen pipeline is provided with a first electric regulating valve, and the first flow meter, the second flow meter and the first electric regulating valve are all connected to the first control unit; The hydrogen-alcohol mixing pipeline is provided with a second electric regulating valve, the heated body is provided with a temperature detector, and the temperature detector and the second electric regulating valve are both connected to the second control unit.

2. The methanol-hydrogen combustion system according to claim 1, characterized in that: During stable combustion, the volume proportion of hydrogen in the hydrogen-alcohol mixing pipeline is 15-40%.

3. The methanol-hydrogen combustion system according to claim 1, characterized in that: The combustion-supporting air pipeline is provided with a pressure switch, the hydrogen pipeline is provided with a first electromagnetic cut-off valve, and the methanol pipeline is provided with a second electromagnetic cut-off valve. The pressure switch is electrically connected to the first electromagnetic cut-off valve and the second electromagnetic cut-off valve. When the pressure switch measures that the pressure of the combustion-supporting air pipeline reaches a preset value, the first electromagnetic cut-off valve controls the hydrogen pipeline to be conductive, and the second electromagnetic cut-off valve controls the methanol pipeline to be conductive.

4. The methanol-hydrogen combustion system according to any one of claims 1 to 3, characterized in that: It also includes a return air pipeline, the heated body is a kiln, the kiln is connected to the methanol vaporization device through the return air pipeline, and a smoke exhaust fan is provided on the return air pipeline.

5. The methanol-hydrogen combustion system according to claim 1, characterized in that: A flame arrester is provided at one end of the hydrogen-alcohol mixing pipeline connected to the burner; and / or, The hydrogen pipeline is provided with a pneumatic relief valve, a leak detection switch and a third electromagnetic cut-off valve, and the third electromagnetic cut-off valve is electrically connected to the leak detection switch.

6. The methanol-hydrogen combustion system according to any one of claims 1 to 3, characterized in that: It also includes a purge pipeline, the hydrogen pipeline is connected to the purge pipeline, and the purge pipeline is used to introduce non-combustible gas.

7. The methanol-hydrogen combustion system according to any one of claims 1 to 3, characterized in that: The hydrogen pipeline includes a methanol re-filled hydrogen production device and a hydrogen storage tank. The pipeline connecting the methanol re-filled hydrogen production device and the hydrogen storage tank is also connected in parallel with a carbon capture device.

8. A methanol-hydrogen combustion process based on the methanol-hydrogen combustion system according to any one of claims 1 to 7, characterized in that: include In the preheating process, the methanol vaporization device preheats the liquid methanol in the methanol pipeline into gaseous state; In the ignition process, combustion-supporting air and gaseous methanol are introduced into the burner in sequence, and ignited and burned; In the hydrogen mixing and heating process, after the combustion-supporting air and gaseous methanol in the burner are stably burned, hydrogen is introduced into the burner to gradually increase the proportion of hydrogen in the hydrogen-alcohol mixing pipeline. After 1.5 to 5 minutes, the volume proportion of hydrogen entering the hydrogen-alcohol mixing pipeline is 15 to 40%; During normal operation, the second control unit adjusts the opening of the second electric regulating valve according to the kiln temperature measured by the temperature detector, and the first control unit controls the opening of the first electric regulating valve according to the real-time hydrogen flow measured by the first flow meter and the real-time gaseous methanol flow measured by the second flow meter, so that the volume proportion of hydrogen entering the hydrogen-alcohol mixing pipeline is 15-40%.

9. The methanol-hydrogen combustion process according to claim 1, characterized in that: Also includes In the purging process, non-flammable gas is introduced into the hydrogen-alcohol mixing pipeline, the burner and the end of the hydrogen pipeline to discharge the residual gas in the hydrogen pipeline, the hydrogen-alcohol mixing pipeline and the burner.

10. The methanol-hydrogen combustion process according to claim 1, characterized in that: The normal operation process also includes The methanol vaporization device stops preheating, and the kiln introduces kiln flue gas into the methanol vaporization device through the return air duct. The methanol vaporization device exchanges heat with the kiln flue gas to vaporize the methanol.

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