Starting-up device and starting-up method of vehicle-mounted methanol-to-hydrogen system

Abstract

The invention discloses a starting-up device and starting-up method of a vehicle-mounted methanol hydrogen production system, the starting-up device comprises a gas purging pipeline and a heating device, the heating device is arranged in a reforming reactor and a purification system to preheat the reforming reactor and the purification system; the gas purging pipeline comprises a first purging pipeline and a second purging pipeline, and the first purging pipeline and the second purging pipeline are both communicated with a methanol water raw material pipeline in a methanol-to-hydrogen system; the first purging pipeline is used for introducing nitrogen into the methanol-to-hydrogen system so as to perform nitrogen purging on the methanol-to-hydrogen system; and the second purging pipeline is used for introducing hydrogen into the methanol-to-hydrogen system so as to displace nitrogen in the methanol-to-hydrogen system. According to the technical scheme, the volume of the methanol hydrogen production system can be miniaturized; and the effect of instant opening and instant use is achieved at the starting time of the vehicle.

Description

Technical Field

[0001] The invention relates to the technical field of methanol hydrogen production, and in particular to a startup device and a startup method for a vehicle-mounted methanol hydrogen production system. Background Art

[0002] Based on the development needs of the hydrogen energy industry, hydrogen energy has been widely promoted. The demand for hydrogen energy at the terminal is also updated day by day, but the current use of methanol hydrogen production system on vehicle-mounted equipment is still in the experimental stage. In the methanol hydrogen production system, the two most important equipment are the reforming reactor and the purification system. The reforming reactor is used to carry out the reforming reaction to generate a reformed mixed gas; the purification system is used to separate the reformed mixed gas to obtain high-purity hydrogen and the separated mixed tail gas. In order to discharge impurities in the methanol hydrogen production system, inspect the quality of the device, and avoid accidents during shutdown, a startup device will be set in the methanol hydrogen production system to purge the methanol hydrogen production system.

[0003] The prior art with patent application number CN202311216197.8 discloses a method, device, equipment and storage medium for controlling the startup of a methanol cracking hydrogen production device. The prior art transforms the existing methanol hydrogen production pipeline so that the nitrogen purge before startup is changed from two to one, thereby realizing remote control of the startup process of the methanol cracking hydrogen production device; at the same time, it heats the nitrogen through a thermal oil heating system so that the entire device can be heated before startup.

[0004] However, since the existing technology adopts a thermal oil heating system, when applied to vehicle-mounted terminal equipment, it has the problems of large footprint, easy leakage and high maintenance cost. It cannot be used for vehicle-mounted hydrogen production vehicles. Therefore, how to design a methanol hydrogen production device with a small size; hydrogen purity that meets the standards of hydrogen fuel cells; miniaturization of the purification system; and immediate use when the vehicle is started are the current difficulties of vehicle-mounted methanol hydrogen production devices. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a startup device and a startup method for a vehicle-mounted methanol hydrogen production system, and the technical solution is as follows:

[0006] A startup device for a vehicle-mounted methanol hydrogen production system comprises a gas purge pipeline and a heating device, wherein the heating device is arranged in a reforming reactor and a purification system to provide preheating for the reforming reactor and the purification system; the gas purge pipeline comprises a first purge pipeline and a second purge pipeline, and the first purge pipeline and the second purge pipeline are both connected to a methanol-water raw material pipeline in the methanol hydrogen production system; the first purge pipeline is used to pass nitrogen into the methanol hydrogen production system to purge the methanol hydrogen production system with nitrogen; the second purge pipeline is used to pass hydrogen into the methanol hydrogen production system to replace the nitrogen in the methanol hydrogen production system.

[0007] Preferably, the heating device comprises an electricity storage device and an electric heating device electrically connected to the electricity storage device, and the electric heating device is provided in both the reforming reactor and the purification system.

[0008] Preferably, a switch valve is provided in the first purge pipeline.

[0009] Preferably, the purge pipeline further includes a third purge pipeline, one end of the third purge pipeline is connected to the second purge pipeline, and the other end of the third purge pipeline is connected to the reformed mixed gas pipeline in the methanol-to-hydrogen system.

[0010] Preferably, a first one-way valve is further provided in the first purge line, a second one-way valve is provided in the second purge line, and a third one-way valve is provided in the third purge line; the first one-way valve is provided after the outlet of the safety valve.

[0011] Preferably, the startup device also includes a circulation pipeline, which is connected to the first purge pipeline; one end of the circulation pipeline is arranged between the inlet of the methanol water raw material pipeline and the outlet of the first one-way valve, and the other end is arranged between the nitrogen source and the inlet of the switch valve.

[0012] Preferably, a second filter and a fan are further provided in the first purge pipeline, the second filter is connected to the nitrogen source, and the second filter, the switch valve, the fan and the first one-way valve are sequentially connected in series in the first purge pipeline.

[0013] Preferably, the startup device also includes a multi-stream heat exchanger; the multi-stream heat exchanger is used to exchange heat between the methanol water pipeline in the methanol hydrogen production system and the purified gas pipeline and the cooling tail gas pipeline; a safety valve is also provided in the circulation pipeline.

[0014] A startup method for a vehicle-mounted methanol hydrogen production system, the startup method using the startup device, the startup method comprising the following steps:

[0015] S1: Open the switch valve to allow nitrogen to flow into the first purge pipeline, and at the same time turn on the power storage device and the electric heating device to preheat the reforming reactor and the purification system in the methanol hydrogen production system;

[0016] S2: Nitrogen flows into the first purge pipeline and then flows into the methanol hydrogen production system through the methanol water raw material pipeline, and flows out of the methanol hydrogen production system through the cooling gas pipeline and the product gas pipeline in the methanol hydrogen production system respectively, thereby completing the nitrogen purge of the methanol hydrogen production system;

[0017] S3: closing the switch valve, introducing hydrogen into the second purge pipeline, and allowing the hydrogen to flow into the methanol system through the methanol-water raw material pipeline;

[0018] S4: starting the catalytic burner in the methanol hydrogen production system, so that the hydrogen flowing into the catalytic burner is burned in the catalytic burner to obtain hydrogen combustion gas;

[0019] S5: The hydrogen combustion gas flows into the reforming reactor in the methanol hydrogen production system to perform secondary preheating on the reforming reactor;

[0020] S6: The reforming reactor and the purification system are heated to the startup temperature to complete the startup.

[0021] Preferably, the heating rate of the electric heating device is 50°C / h, and the heating rate is increased after the temperature reaches 200°C.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The start-up device can be connected to the methanol water inlet of the existing methanol hydrogen production system to start the system. There is no need to carry out complicated transformation of the existing methanol hydrogen production system, and the methanol hydrogen production system can be cleaned and started up, with low transformation cost and strong applicability;

[0024] 2) The startup device and startup method of the present invention include purging and preheating. After the nitrogen purging is completed, hydrogen is introduced for replacement, and the hydrogen is burned during the replacement to preheat the methanol hydrogen production system; thus, the startup conditions can be met after the purging is completed, and no additional heat source is required to heat the methanol hydrogen production system;

[0025] 3) The startup device has the advantages of environmental protection, energy saving, small footprint, and higher safety. Electric preheating is used during startup, and the system heat cycle is used to provide heat energy for the methanol hydrogen production system after startup, omitting the traditional heating method using thermal oil. It is safer, occupies a smaller area, and is more suitable for vehicle-mounted equipment;

[0026] 5) In the corresponding methanol hydrogen production system, a palladium membrane purification system is used to purify hydrogen, so that the area of ​​the purification device is smaller and more suitable for vehicle-mounted equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a methanol hydrogen production system in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the purge pipeline of the present invention;

[0029] Figure 3 It is a schematic diagram of the startup device of the present invention and its connection with the methanol hydrogen production system. DETAILED DESCRIPTION

[0030] 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.

[0031] Embodiment 1:

[0032] A startup device for a vehicle-mounted methanol hydrogen production system is improved based on an existing methanol hydrogen production system. The existing methanol hydrogen production system used in the present invention may include a reforming reactor and a purification system; at the same time, it may also include a catalytic burner.

[0033] In the present invention, if Figure 1 As shown, a methanol-to-hydrogen system including a reforming reactor 100, a purification system 200 and a catalytic burner 300 is taken as an example for detailed description.

[0034] The methanol hydrogen production system comprises a reforming reactor 100, a purification system 200 and a catalytic burner 300, as well as a methanol water raw material pipeline 401, a reforming mixed gas pipeline 402, a purified gas pipeline 403, a mixed tail gas pipeline 404, a combustion tail gas pipeline 405, a cooling tail gas pipeline 406 and a product gas pipeline 407; wherein the methanol water raw material pipeline 401 connects the methanol water tank with the raw material inlet 101 of the reforming mixer 100; the reforming mixed gas pipeline connects the reforming mixed gas outlet 10 2 is connected to the inlet of the purification system 200; the purified gas pipeline 403 connects the purified hydrogen outlet of the purification system and the product gas pipeline 407; the mixed tail gas pipeline 404 connects the tail gas outlet of the purification system 200 with the gas inlet of the catalytic burner 300; the combustion tail gas pipeline 405 connects the outlet of the catalytic burner 300 with the heat medium inlet 103 of the reforming reactor 100; the cooling tail gas pipeline 406 is connected to the heat medium outlet 104 of the reforming reactor 100.

[0035] A startup device for a vehicle-mounted methanol hydrogen production system, such as Figure 2 and 3As shown, it includes a gas purge pipeline and a heating device, and the heating device includes an electricity storage device and an electric heating device 2, and the electricity storage device is electrically connected to the electric heating device 2. The gas purge pipeline is used to pass nitrogen or hydrogen into the methanol hydrogen production system when starting up; the gas purge pipeline includes a first purge pipeline 11 and a second purge pipeline 12, and the first purge pipeline 11 and the second purge pipeline 12 are both connected to the methanol water raw material inlet pipeline 401 of the methanol hydrogen production system; wherein the first purge pipeline 11 is used to pass nitrogen into the methanol hydrogen production system to purge impurities in various devices and pipelines in the methanol hydrogen production system; the second purge pipeline 12 is used to pass hydrogen into the methanol hydrogen production system to replace the nitrogen in the methanol hydrogen production system.

[0036] The power storage device is used to store electrical energy, thereby providing initial energy for starting the methanol hydrogen production system; the electric heating device 2 converts electrical energy into thermal energy to preheat the methanol hydrogen production system. Figure 3 As shown, the electric heating device 2 is provided in both the reforming reactor and the purification system, and the electric heating device 2 is coated on the outside of the reforming reactor 100 and the purifier in the purification system 200. The hydrogen flows into the methanol hydrogen production system through the methanol water raw material pipeline 401 through the second purge pipeline 12, and flows out of the methanol hydrogen production system through the product gas pipeline 407.

[0037] Furthermore, a switch valve 13 is provided in the first purge pipeline 11, which is used to control whether nitrogen flows into the methanol-to-hydrogen system to perform nitrogen purge.

[0038] When the methanol hydrogen production system is purged, the purge gas is used to purge the tube side of the reforming reactor 100 and the purification system 200 through the methanol-water raw material pipeline 401, the reforming mixed gas pipeline 402 and the purified gas pipeline 403; the purge gas is used to purge the catalytic burner 300 through the mixed tail gas pipeline 402, and is used to purge the shell side of the reforming reactor 100 through the combustion tail gas pipeline 405.

[0039] Among them, the nitrogen purge flow path is: first purge pipeline 11→methanol water raw material pipeline 401→raw material inlet 101 of reforming reactor→reforming mixed gas outlet 102 of reforming reactor→reforming mixed gas pipeline 402→purification system 200. After flowing through the purification system 200, the nitrogen is split in the purification system 200, one of which is split from the hydrogen outlet of the purification system to the purified gas pipeline 403→product gas pipeline 407→discharged; the other is split from the tail gas outlet of the purification system to the mixed tail gas pipeline 404→heat medium inlet 103 of the reforming reactor→catalytic combustion furnace 300→heat medium outlet 104 of the reforming reactor→combustion tail gas pipeline 405→cooling tail gas pipeline 406→discharged.

[0040] The flow path of hydrogen purge is: second purge pipeline 12 → methanol water raw material pipeline 401 → raw material inlet 101 of reforming reactor → reforming mixed gas outlet 102 of reforming reactor → reforming mixed gas pipeline 402 → purification system 200. After flowing through purification system 200, hydrogen is split in the purification system, one of which is split from the hydrogen outlet of the purification system to the purified gas pipeline 403 → product gas pipeline 407 → exhaust; the other is split from the exhaust outlet of the purification system to the mixed exhaust pipeline 404 → heat medium inlet 103 of the reforming reactor → catalytic burner 300 → heat medium outlet 104 of the reforming reactor → combustion exhaust pipeline 405 → cooling exhaust pipeline 406 → exhaust.

[0041] When the startup device is working, the switch valve is opened, nitrogen is introduced into the first purge pipeline 11, and then flows into the methanol hydrogen production system through the methanol water raw material pipeline 401, and then flows out of the methanol hydrogen production system through the cooling gas pipeline 406 and the product gas pipeline 407 to complete the nitrogen purge; the switch valve 13 is closed, hydrogen is introduced into the second purge line 12, and flows into the methanol hydrogen production system through the methanol water raw material pipeline 401, and finally flows out of the methanol hydrogen production system through the cooling gas pipeline 406 and the product gas pipeline 407, thereby completing the replacement of nitrogen by hydrogen. Among them, the heating device can be turned on to preheat the reforming reactor 100 and the purification system 200 when starting up, and in the initial stage of starting up, the replacement hydrogen is provided by the outside of the methanol hydrogen production system.

[0042] The startup method using this startup device is:

[0043] 1) Open the switch valve 13 to allow nitrogen to flow into the first purge pipeline 11; at the same time, open the power storage device 2 and the heating device 3 to preheat the reforming reactor 100 and the purification system 200;

[0044] 2) The nitrogen gas flows through the first purge pipeline 11 and then flows into the methanol hydrogen production system through the methanol water raw material pipeline 401, and flows out of the methanol hydrogen production system through the cooling gas pipeline 406 and the product gas pipeline 407, respectively, thereby completing the nitrogen purge of the methanol hydrogen production system;

[0045] 3) closing the switch valve 13, introducing hydrogen into the second purge pipeline 12, and allowing the hydrogen to flow into the methanol system through the methanol-water raw material pipeline 401;

[0046] 4) Turning on the catalytic burner 300 to burn the hydrogen flowing into the catalytic burner 300, thereby obtaining hydrogen combustion gas;

[0047] 5) The hydrogen combustion gas flows into the shell side of the reforming reactor 100 to perform secondary preheating on the reforming reactor;

[0048] 6) The reforming reactor 100 and the purification system 200 are heated to the startup temperature to complete the startup.

[0049] By setting a purge pipeline in the hydrogen production system, the gas in each pipeline is purged with an inert gas when starting up, and then the purged nitrogen is replaced with hydrogen. On the one hand, sufficient purge of the methanol hydrogen production system can avoid production accidents caused by valve cutoff in the reforming hydrogen production system during shutdown of the methanol hydrogen production system; on the other hand, during hydrogen purging, electric energy is used to preheat the reforming reactor 100, the purification system 200 and the pipelines in the system for the first time; then the hydrogen is burned and the reforming reactor 100 is preheated for the second time using the heat exchange principle to reach the startup temperature; while completing the purge, the methanol hydrogen production system is preheated; the startup time is saved, and the production cost is reduced at the same time.

[0050] Embodiment 2:

[0051] The difference between this embodiment and embodiment 1 is that the startup device is applied to an alloy membrane purifier as the purification system 200, and the purification system 200 is preferably a palladium membrane purifier.

[0052] During shutdown, there will be residual methanol-water solution in the methanol-water pipeline and the reforming reactor, and the heated alloy membrane purifier may cause structural changes in the alloy material after contacting the cooling liquid, thus affecting the purification effect and product quality.

[0053] Therefore, in order to avoid the purge process, the purge gas will carry the methanol water pipeline and the reforming reactor to the purification system 200, such as Figure 2 As shown, the startup device further includes a first filter 52, and the purge pipeline further includes a third purge pipeline 5, one end of the third purge pipeline 5 is connected to the second purge pipeline 12, and the other end is connected to the reforming mixed gas pipeline 402; and the first filter 52 is arranged before the confluence point of the third purge pipeline 5 and the reforming mixed gas pipeline 402. At the same time, a filter can also be arranged after the confluence point of the third purge pipeline 5 and the reforming mixed gas pipeline 402 according to actual needs, so that the water content in the purge gas does not affect the purification performance of the purification system.

[0054] This embodiment can filter impurities and water in the purge gas flowing out of the reformed mixed gas by directly setting a third purge pipeline at the front end of the purification device and setting a first filter 52 at the front end of the third purge pipeline connected to the reformed mixed gas pipeline 402. The above arrangement not only prevents the alloy membrane purifier from contacting the liquid in the hydrogen flowing out of the reforming reactor, but also ensures the amount of hydrogen introduced.

[0055] In addition, a third one-way valve 51 is provided in the third purge line 5 to prevent gas from flowing back.

[0056] Therefore, when using alloy membrane purification equipment for purification, such as Figure 2 and 3 As shown, after closing the switch valve 13, hydrogen flows into the methanol hydrogen production system through the second purge pipeline 12 and the third purge pipeline 5 respectively. A part of the hydrogen flowing into the methanol hydrogen production system flows into the methanol hydrogen production system through the methanol-water raw material pipeline 401; the other part flows to the reforming mixed gas pipeline 402 through the third purge pipeline 5.

[0057] Embodiment 3:

[0058] This embodiment is different from Embodiment 1 or 2 in that, Figure 2 and 3 As shown, the first purge pipeline 11 is also provided with a second filter 14, a first one-way valve 15 and a blower 16; the second filter 14 is provided between the nitrogen source and the switch valve 13, and is used to filter impurities in the nitrogen; the first one-way valve 15 is provided after the switch valve 13, specifically between the switch valve 13 and the methanol water raw material pipeline 401, to prevent nitrogen from flowing back; the blower 16 is provided between the switch valve 13 and the first one-way valve 15, and is used to supply air to increase the nitrogen introduction rate. The filter 14, the switch valve 13, the blower 16, and the first one-way valve 15 are connected in series in the first purge pipeline 11 in sequence. A second one-way valve 121 is provided in the second purge gas inflow pipeline 12 to prevent hydrogen from flowing back.

[0059] The startup device also includes a circulation pipeline 4, which is connected to the first purge pipeline 11. One end of the circulation pipeline 4 is arranged between the inlet of the methanol water raw material pipeline 401 and the outlet of the first one-way valve 15, and the other end is arranged between the nitrogen source and the inlet of the switch valve 13.

[0060] During operation, when the gas flow into the first purge pipeline 11 is too much, a part of the nitrogen flows into the circulation pipeline 4, so that the excess nitrogen merges with the nitrogen source through the circulation pipeline 4. While completing the nitrogen purge, on the one hand, the safety of the startup device is improved, and on the other hand, the nitrogen source is saved.

[0061] In addition, a safety valve 41 is also provided in the circulation pipeline 4. When the gas pressure in the first purge pipeline 11 is too high, the pressure can be released by opening the safety valve 41 to avoid safety accidents.

[0062] At the same time, if Figure 3As shown, the startup device also includes a multi-stream heat exchanger 6, and the methanol water pipeline 401, the purified gas pipeline 403 and the cooling tail gas pipeline 406 intersect at the multi-stream heat exchanger. This design allows the nitrogen or hydrogen or hydrogen combustion gas with heat flowing out of the purified gas pipeline 403 and the cooling tail gas pipeline 406 to exchange heat with the nitrogen or hydrogen flowing into the methanol water pipeline during purging, thereby further recovering the heat energy of the startup device to improve thermal efficiency.

[0063] Embodiment 4:

[0064] This embodiment is different from Embodiment 1, 2 or 3 in that, Figure 1 and 2 As shown, a temperature probe 408 is also provided in the product gas pipeline 407, and a plurality of temperature probes 409 are also provided in the reforming reactor and the purification system in the methanol hydrogen production system to control the heating rate in the methanol hydrogen production system.

[0065] When the methanol hydrogen production unit is cold started, the heating rate of the electric heating system is 50°C / h, and the heating rate is increased after the temperature reaches 200°C. At this time, the heating rate is detected by temperature probes in the reforming reactor and the purification system.

[0066] At the same time, the amount of hydrogen entering the catalytic burner 300 is controlled to avoid safety accidents caused by gas accumulation. A gas concentration detector is provided in the catalytic burner 300 to detect the concentration of hydrogen, and a fan is provided and connected to the catalytic burner 300 to control the blowing amount of the fan to control the concentration of hydrogen.

[0067] It should be noted that the technical features in the above-mentioned embodiments 1 to 4 can be combined in any way, and the combined technical solutions all belong to the protection scope of the present application. In this article, terms such as "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A startup device for a vehicle-mounted methanol hydrogen production system, comprising a gas purge pipeline and a heating device, characterized in that: The heating device is arranged in the reforming reactor and the purification system to provide preheating for the reforming reactor and the purification system; the gas purge pipeline includes a first purge pipeline and a second purge pipeline, and the first purge pipeline and the second purge pipeline are both connected to the methanol-water raw material pipeline in the methanol hydrogen production system; the first purge pipeline is used to pass nitrogen into the methanol hydrogen production system to purge the methanol hydrogen production system with nitrogen; the second purge pipeline is used to pass hydrogen into the methanol hydrogen production system to replace the nitrogen in the methanol hydrogen production system.

2. The startup device according to claim 1, characterized in that: The heating device comprises an electric storage device and an electric heating device electrically connected to the electric storage device. The electric heating device is provided in both the reforming reactor and the purification system.

3. The startup device according to claim 2, characterized in that: A switch valve is provided in the first purge pipeline.

4. The startup device according to claim 3, characterized in that: When the purification system adopts an alloy membrane purifier, the startup device also includes a first filter, the purge pipeline also includes a third purge pipeline, one end of the third purge pipeline is connected to the second purge pipeline, and the other end of the third purge pipeline is connected to the reformed mixed gas pipeline in the methanol hydrogen production system; the first filter is arranged before the confluence point of the third purge pipeline and the reformed mixed gas pipeline.

5. The startup device according to claim 4, characterized in that: A first one-way valve is also provided in the first purge line, a second one-way valve is provided in the second purge line, and a third one-way valve is provided in the third purge line; the first one-way valve is provided after the outlet of the safety valve.

6. The startup device according to claim 5, characterized in that: The startup device also includes a circulation pipeline, which is connected to the first purge pipeline; one end of the circulation pipeline is arranged between the inlet of the methanol water raw material pipeline and the outlet of the first one-way valve, and the other end is arranged between the nitrogen source and the inlet of the switch valve.

7. The startup device according to claim 6, characterized in that: The first purge pipeline is also provided with a second filter and a fan, the second filter is connected to the nitrogen source, and the second filter, the switch valve, the fan and the first one-way valve are sequentially connected in series in the first purge pipeline.

8. The startup device according to claim 7, characterized in that: The startup device also includes a multi-stream heat exchanger; the multi-stream heat exchanger is used to exchange heat between the methanol water pipeline in the methanol hydrogen production system and the purified gas pipeline and the cooling tail gas pipeline; a safety valve is also provided in the circulation pipeline.

9. A method for starting up a vehicle-mounted methanol hydrogen production system, characterized in that: The startup method is based on the startup device according to any one of claims 3 to 8, and the startup method comprises the following steps: S1: Open the switch valve to allow nitrogen to flow into the first purge pipeline, and at the same time turn on the power storage device and the electric heating device to preheat the reforming reactor and the purification system in the methanol hydrogen production system; S2: Nitrogen flows into the first purge pipeline and then flows into the methanol hydrogen production system through the methanol water raw material pipeline, and flows out of the methanol hydrogen production system through the cooling gas pipeline and the product gas pipeline in the methanol hydrogen production system respectively, thereby completing the nitrogen purge of the methanol hydrogen production system; S3: closing the switch valve, introducing hydrogen into the second purge pipeline, and allowing the hydrogen to flow into the methanol system through the methanol-water raw material pipeline; S4: starting the catalytic burner in the methanol hydrogen production system, so that the hydrogen flowing into the catalytic burner is burned in the catalytic burner to obtain hydrogen combustion gas; S5: The hydrogen combustion gas flows into the reforming reactor in the methanol hydrogen production system to perform secondary preheating on the reforming reactor; S6: The reforming reactor and the purification system are heated to the startup temperature to complete the startup.

10. The startup method according to claim 9, characterized in that: The heating rate of the electric heating device is 50°C / h, and the heating rate is increased after the temperature reaches 200°C.

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