Multi-stage evacuator for hydrogen production by methanol cracking

Abstract

The utility model relates to the field of methanol cracking production, in particular to a multistage evacuator for methanol cracking hydrogen production, which comprises a mounting base, a hydrogen production and impurity removal tank fixedly mounted on the left side of the upper end of the mounting base, a pre-extraction communicating pipe groove fixedly connected to the upper side of the surface of the hydrogen production and impurity removal tank, and a pre-extraction mechanical pump fixedly connected to the right end of the pre-extraction communicating pipe groove. The lower side of the surface of the hydrogen production and impurity removal tank is fixedly connected with a fine extraction communicating pipe groove, the right end of the fine extraction communicating pipe groove is fixedly connected with a fine extraction molecular pump, the upper end of the hydrogen production and impurity removal tank is fixedly provided with an air pressure sensor, and the right side of the upper end of the mounting base is fixedly provided with a mounting frame; according to the utility model, the pre-pumping mechanical pump is matched with the pre-pumping communicating pipe to carry out pre-pumping evacuation operation, and then the fine-pumping molecular pump is matched with the fine-pumping communicating pipe groove to carry out fine-pumping evacuation operation, so that objects in the vacuum chamber can be efficiently vacuumized, the vacuum degree is higher, and efficient reaction and product purity are ensured.

Description

Technical Field

[0001] This utility model relates to the field of methanol cracking production, and in particular to a multi-stage evacuation device for methanol cracking to produce hydrogen. Background Technology

[0002] Methanol cracking for hydrogen production refers to the process of producing hydrogen and carbon dioxide through a chemical reaction between methanol and water vapor under the action of a catalyst. Specifically, under certain temperature and pressure conditions, methanol and water vapor undergo methanol cracking and carbon monoxide conversion reactions under the action of a catalyst, ultimately producing hydrogen and carbon dioxide. This process involves multiple reaction steps and requires specific temperature and pressure conditions to drive it. The vacuum equipment used in the methanol cracking for hydrogen production is mainly to create a vacuum environment in specific steps to ensure the smooth progress of the reaction.

[0003] For example, patent number (CN110627017A) discloses a methanol high-temperature cracking hydrogen production device, including a furnace frame and an electrical control box. The electrical control box is equipped with a pressure gauge, a methanol flow meter, a compressed air flow meter, a nitrogen flow meter, and a cracked gas flow meter. The top of the furnace frame is equipped with a furnace top cover plate. Inside the furnace frame are a cracking furnace chamber, a cracked gas outlet, a cracked gas outlet shut-off valve, a cracked gas flow regulating valve, a pneumatic valve, a nitrogen regulating valve, a gas pressure reducing valve, a cooler, a cooling water inlet, a cooling water outlet, a carbon vent, a methanol inlet, a vent shut-off valve, a vent pneumatic valve, and a compressed air inlet. The beneficial effects of this invention are: the methanol flow is uniform and the pressure is stable due to the two flow meters and the separate furnace chamber; the carbon removal is changed to automatic carbon removal, which greatly reduces the labor intensity of workers, saves valuable time, improves work efficiency, reduces energy consumption during start-up and shutdown, and extends the service life of the equipment.

[0004] Currently, methanol cracking hydrogen production units have poor cracking efficiency and incomplete separation of the cracked mixed gas, which affects the quality of the cracked hydrogen and makes it difficult to meet people's usage requirements.

[0005] Therefore, given the poor cracking effect of the above-mentioned device and the incomplete separation of the mixed gas after cracking, which has a certain impact on the quality of hydrogen produced by cracking, a multi-stage evacuation device for methanol cracking to produce hydrogen can be designed. Utility Model Content

[0006] In order to overcome the problem that the cracking effect of the device is not good and the separation of the mixed gas after cracking is incomplete, which has a certain impact on the quality of hydrogen produced by cracking.

[0007] The technical solution of this utility model is as follows: a multi-stage evacuation device for methanol cracking to produce hydrogen, including a mounting base, a hydrogen production and impurity removal tank fixedly mounted on the left side of the upper end of the mounting base, a pre-evacuation connecting pipe groove fixedly connected to the upper side of the surface of the hydrogen production and impurity removal tank, a pre-evacuation mechanical pump fixedly connected to the right end of the pre-evacuation connecting pipe groove, a fine evacuation connecting pipe groove fixedly connected to the lower side of the surface of the hydrogen production and impurity removal tank, a fine evacuation molecular pump fixedly connected to the right end of the fine evacuation connecting pipe groove, a pressure sensor fixedly mounted on the upper end of the hydrogen production and impurity removal tank, a mounting frame fixedly mounted on the right side of the upper end of the mounting base, connecting plates fixedly mounted on both the upper and lower sides inside the mounting frame, a shock absorber fixedly mounted on the upper end of the connecting plate, a mounting plate fixedly mounted on the upper end of the shock absorber, through holes opened on the inner sides of the connecting plate and the mounting plate, and sound-absorbing cotton arranged inside the connecting plate and the mounting plate.

[0008] Preferably, the pre-evacuation component is connected to the first interface via a mechanical pump, while the fine evacuation component is connected to the second interface via a molecular pump. This design ensures that the objects in the vacuum chamber are efficiently evacuated, resulting in a higher vacuum level. The hydrogen production and impurity removal tank can work with other equipment such as mixing tanks and cracking tanks to complete methanol cracking for hydrogen production. The hydrogen production and impurity removal tank is one of the steps in this process. The pre-evacuation mechanical pump can work with the pre-evacuation connecting pipe for pre-evacuation and evacuation operations, while the fine evacuation molecular pump can work with the fine evacuation connecting pipe for fine evacuation and evacuation operations. The pressure sensor can monitor the internal pressure of the equipment at all times during operation and display the real-time data on the display screen. The mounting bracket can fix the pre-evacuation mechanical pump and the fine evacuation molecular pump. The shock absorber and shock-absorbing pad can achieve the shock absorption function, while the sound-absorbing cotton and sound-absorbing panels can achieve the noise reduction function.

[0009] Preferably, an information processing module is fixedly installed at the upper end of the hydrogen production and impurity removal tank, located next to the pressure sensor, and the information processing module is electrically connected to the pressure sensor.

[0010] Preferably, a communication module is fixedly installed on the left side of the upper end of the information processing module, and an indicator light is fixedly installed on the right side of the upper end of the information processing module.

[0011] Preferably, the indicator light and communication module are electrically connected to the information processing module, and an air pump is fixedly installed on the right side of the upper end of the hydrogen production and impurity removal tank.

[0012] Preferably, the shock absorbers are evenly spaced, the through holes are evenly spaced, and a shock-absorbing pad is fixedly installed on the upper end of the mounting plate.

[0013] Preferably, the lower end of the pre-extraction mechanical pump is fixedly connected to the shock-absorbing pad, and the lower end of the fine extraction molecular pump is fixedly connected to the shock-absorbing pad.

[0014] Preferably, a sound-absorbing panel is fixedly installed on the upper end of the mounting bracket, and sound-absorbing holes are opened on the inner side of the sound-absorbing panel.

[0015] The beneficial effects of this utility model are:

[0016] This multi-stage vacuum device for methanol cracking to produce hydrogen utilizes a pre-vacuum mechanical pump in conjunction with a pre-vacuum connecting pipe for pre-vacuuming operations, followed by a fine vacuuming operation using a fine vacuum molecular pump in conjunction with a fine vacuum connecting pipe. This ensures that the objects in the vacuum chamber are efficiently evacuated, and that the vacuum level is higher, thus ensuring the efficient progress of the reaction and the purity of the product.

[0017] The gas pressure sensor is used to monitor the internal gas pressure of the equipment at all times during the operation and display the real-time data on the screen. The data is also uploaded at the same time. In conjunction with the multi-stage evacuation structure, the equipment can be evacuated in multiple stages to ensure thorough separation of the gas after cracking, which provides a certain guarantee for the quality of methanol cracking.

[0018] The vibration damper and damping pad absorb most of the vibration generated during the operation of the pre-extraction mechanical pump and the fine extraction molecular pump, thus achieving the vibration reduction function. The sound-absorbing cotton and sound-absorbing board have the characteristics of absorbing sound waves, so that most of the sound wave energy is converted into mechanical energy or heat energy through the interaction force between the fibers and pores in the sound-absorbing layer. This absorbs part of the noise generated during the operation of the pre-extraction mechanical pump and the fine extraction molecular pump, thus achieving the noise reduction function. Attached Figure Description

[0019] Figure 1 The diagram shown is a three-dimensional structural schematic of the multi-stage evacuation device for methanol cracking to produce hydrogen according to this utility model.

[0020] Figure 2 The diagram shown is a three-dimensional structural schematic of the hydrogen production and impurity removal tank of this utility model.

[0021] Figure 3 The diagram shown is a three-dimensional structural schematic of the mounting bracket of this utility model;

[0022] Figure 4 The diagram shown is a three-dimensional structural schematic of the mounting plate of this utility model.

[0023] Figure 5 The diagram shown is a three-dimensional structural schematic of the sound-absorbing cotton of this utility model.

[0024] Explanation of reference numerals in the attached diagram: 1. Mounting base; 2. Hydrogen production and impurity removal tank; 3. Pre-extraction connecting pipe groove; 4. Pre-extraction mechanical pump; 5. Fine extraction connecting pipe groove; 6. Fine extraction molecular pump; 7. Pressure sensor; 8. Mounting bracket; 9. Connecting plate; 10. Shock absorber; 11. Mounting plate; 12. Through hole; 13. Sound-absorbing cotton; 14. Information processing module; 15. Communication module; 16. Indicator light; 17. Air pump; 18. Shock-absorbing pad; 19. Sound-absorbing panel; 20. Sound-absorbing hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Methanol cracking to produce hydrogen: Hydrogen has a wide range of industrial applications. In recent years, due to the rapid development of fine chemicals, anthraquinone process for hydrogen peroxide production, powder metallurgy, hydrogenation of oils and fats, hydrogenation of forestry and agricultural products, bioengineering, hydrogenation of petroleum refining, and hydrogen fuel cell vehicles, the demand for pure hydrogen has increased rapidly.

[0028] Hydrogen has a wide range of industrial applications. In recent years, the demand for pure hydrogen has increased rapidly due to the rapid development of fine chemicals, anthraquinone process for hydrogen peroxide production, powder metallurgy, hydrogenation of oils and fats, hydrogenation of forestry and agricultural products, bioengineering, hydrogenation of petroleum refining, and hydrogen fuel cell vehicles.

[0029] For regions lacking convenient hydrogen sources, traditional methods of producing hydrogen from petroleum, natural gas, or coal require massive investments—"equivalent to half of ammonia synthesis"—making them suitable only for large-scale users. While water electrolysis can conveniently produce hydrogen for small and medium-sized users, it consumes a lot of energy, produces hydrogen with unsatisfactory purity and numerous impurities, and its scale is limited. Therefore, in recent years, many plants that previously used water electrolysis for hydrogen production have undergone technological upgrades, switching to a new process route of methanol steam reforming for hydrogen production.

[0030] The vacuum equipment used in methanol cracking for hydrogen production is primarily designed to create a vacuum environment at specific stages, ensuring the smooth progress of the reaction. In the methanol cracking process, after mixing methanol and demineralized water, the vacuum equipment creates a vacuum environment to help the mixture reach the required temperature and pressure conditions during preheating and vaporization. Catalytic conversion reaction: During the catalytic cracking and conversion reactions in the converter, the vacuum equipment ensures the required vacuum level inside the reactor to promote the chemical reaction. Gas cooling and condensation: When the high-temperature converted gas undergoes cooling and condensation, the vacuum equipment helps reduce the gas pressure, making it easier to cool and condense. Gas purification: During the pressure swing adsorption (PSA) purification of hydrogen, the vacuum equipment ensures the required vacuum level inside the adsorber, thereby improving the purification effect. Through these steps, the vacuum equipment plays a crucial role in the methanol cracking process for hydrogen production, ensuring efficient reaction and product purity.

[0031] A multistage evacuation device is a type of equipment used to improve vacuum levels. It combines multiple suction units to achieve a higher vacuum. A multistage evacuation device refers to a multistage vacuum pump formed by organically combining two or more suction units. This device gradually increases the vacuum level through multistage compression and diffusion processes, overcoming the problems of long evacuation times and low efficiency associated with single pumps or pump combinations.

[0032] Please see Figures 1-5 This utility model provides an embodiment of a multi-stage evacuation device for methanol cracking to produce hydrogen, including a mounting base 1. A hydrogen production and impurity removal tank 2 is fixedly mounted on the left side of the upper end of the mounting base 1. A pre-evacuation connecting pipe 3 is fixedly connected to the upper side of the surface of the hydrogen production and impurity removal tank 2. A pre-evacuation mechanical pump 4 is fixedly connected to the right end of the pre-evacuation connecting pipe 3. A fine evacuation connecting pipe 5 is fixedly connected to the lower side of the surface of the hydrogen production and impurity removal tank 2. A fine evacuation molecular pump 6 is fixedly connected to the right end of the fine evacuation connecting pipe 5. A pressure sensor 7 is fixedly mounted on the upper end of the hydrogen production and impurity removal tank 2. A mounting frame 8 is fixedly mounted on the right side of the upper end of the mounting base 1. Connecting plates 9 are fixedly mounted on both the upper and lower sides inside the mounting frame 8. A shock absorber 10 is fixedly mounted on the upper end of the connecting plate 9. An installation plate 11 is fixedly installed on the upper end of the device 10. Through holes 12 are opened on the inner side of both the connecting plate 9 and the installation plate 11. Sound-absorbing cotton 13 is installed inside both the connecting plate 9 and the installation plate 11. The pre-evacuation operation of the equipment is completed by the pre-evacuation mechanical pump 4, and then the fine evacuation operation of the equipment is completed by the fine evacuation molecular pump 6, which further realizes the multi-stage evacuation operation of the equipment, ensuring the thorough separation of the gas after cracking, and providing a certain guarantee for the quality of methanol cracking. The shock absorber 10 and the shock-absorbing pad 18 absorb most of the vibration generated when the multi-stage evacuation structure is working, realizing the shock absorption function. The sound-absorbing cotton 13 and the sound-absorbing plate 19 and other sound-absorbing structures absorb some of the noise emitted when the multi-stage evacuation structure is working, realizing the noise reduction function.

[0033] Please see Figures 1-3In this embodiment, an information processing module 14 is fixedly installed on the upper end of the hydrogen production and impurity removal tank 2, next to the pressure sensor 7. The information processing module 14 is electrically connected to the pressure sensor 7. A communication module 15 is fixedly installed on the left side of the upper end of the information processing module 14, and an indicator light 16 is fixedly installed on the right side of the upper end of the information processing module 14. Both the indicator light 16 and the communication module 15 are electrically connected to the information processing module 14. A gas pump 17 is fixedly installed on the right side of the upper end of the hydrogen production and impurity removal tank 2. The pre-evacuation mechanical pump 4 is used in conjunction with the pre-evacuation connecting pipe 3 to connect the hydrogen production and impurity removal tank 2 to complete the pre-evacuation and evacuation operation of the equipment. Then, the fine evacuation molecular pump 6 is used in conjunction with the fine evacuation connecting pipe 5 to connect the hydrogen production and impurity removal tank 2 to complete the fine evacuation and evacuation operation of the equipment. The pressure sensor 7 monitors the internal gas pressure of the equipment at all times during the operation and displays the real-time data on the display screen and uploads the data simultaneously to complete the multi-stage evacuation operation of the equipment, ensuring thorough separation of the pyrolysis gas and providing a certain guarantee for the quality of methanol pyrolysis.

[0034] Please see Figures 3-5 In this embodiment, the shock absorbers 10 are evenly spaced, the through holes 12 are evenly spaced, the upper end of the mounting plate 11 is fixedly mounted with a shock-absorbing pad 18, the lower end of the pre-extraction mechanical pump 4 is fixedly connected to the shock-absorbing pad 18, the lower end of the fine extraction molecular pump 6 is fixedly connected to the shock-absorbing pad 18, the upper end of the mounting frame 8 is fixedly mounted with a sound-absorbing plate 19, and the inner side of the sound-absorbing plate 19 is provided with sound-absorbing holes 20. The pre-extraction mechanical pump 4 and the fine extraction molecular pump 6 are fixedly mounted by the mounting frame 8. The shock absorbers 10 and the shock-absorbing pad 18 absorb most of the vibration generated when the pre-extraction mechanical pump 4 and the fine extraction molecular pump 6 are working, thereby achieving the shock absorption function. The sound-absorbing cotton 13 and the sound-absorbing plate 19 and other sound-absorbing structures absorb some of the noise emitted when the pre-extraction mechanical pump 4 and the fine extraction molecular pump 6 are working, thereby achieving the noise reduction function.

[0035] During operation, the pre-evacuation mechanical pump 4, in conjunction with the pre-evacuation connecting pipe 3, is connected to the hydrogen production and impurity removal tank 2 to complete the pre-evacuation and evacuation of the equipment. Then, the fine evacuation molecular pump 6, in conjunction with the fine evacuation connecting pipe 5, is connected to the hydrogen production and impurity removal tank 2 to complete the fine evacuation and evacuation of the equipment. The pressure sensor 7 continuously monitors the internal pressure of the equipment during operation and displays the real-time data on the display screen, and uploads the data simultaneously, completing the multi-stage evacuation operation of the equipment. This ensures thorough separation of the pyrolysis gas and provides a certain guarantee for the quality of methanol pyrolysis. The pre-evacuation mechanical pump 4 and the fine evacuation molecular pump 6 are fixedly installed by the mounting bracket 8. The shock absorber 10 and the shock-absorbing pad 18 absorb most of the vibration generated by the pre-evacuation mechanical pump 4 and the fine evacuation molecular pump 6 during operation, achieving the shock absorption function. The sound-absorbing cotton 13 and the sound-absorbing plate 19, etc., absorb some of the noise emitted by the pre-evacuation mechanical pump 4 and the fine evacuation molecular pump 6 during operation, achieving the noise reduction function.

[0036] Through the above steps, the pre-evacuation mechanical pump 4 is used to complete the pre-evacuation operation of the equipment, and then the fine evacuation molecular pump 6 is used to complete the fine evacuation operation of the equipment, further realizing the multi-stage evacuation operation of the equipment, ensuring the thorough separation of the gas after cracking, and providing a certain guarantee for the quality of methanol cracking. This solves the problem that the cracking effect of the unit is not good and the separation of the mixed gas after cracking is incomplete, which has a certain impact on the quality of hydrogen production from cracking.

Claims

1. A multi-stage evacuation device for hydrogen production by methanol cracking, comprising a mounting base (1), characterized in that: A hydrogen production and impurity removal tank (2) is fixedly installed on the left side of the upper end of the mounting base (1). A pre-extraction connecting pipe groove (3) is fixedly connected to the upper side of the surface of the hydrogen production and impurity removal tank (2). A pre-extraction mechanical pump (4) is fixedly connected to the right end of the pre-extraction connecting pipe groove (3). A fine extraction connecting pipe groove (5) is fixedly connected to the lower side of the surface of the hydrogen production and impurity removal tank (2). A fine extraction molecular pump (6) is fixedly connected to the right end of the fine extraction connecting pipe groove (5). A pressure sensor is fixedly installed on the upper end of the hydrogen production and impurity removal tank (2). (7) A mounting bracket (8) is fixedly installed on the right side of the upper end of the mounting base (1). A connecting plate (9) is fixedly installed on both the upper and lower sides inside the mounting bracket (8). A shock absorber (10) is fixedly installed on the upper end of the connecting plate (9). A mounting plate (11) is fixedly installed on the upper end of the shock absorber (10). A through hole (12) is opened on the inner side of the connecting plate (9) and the mounting plate (11). Sound-absorbing cotton (13) is provided inside the connecting plate (9) and the mounting plate (11).

2. The multi-stage evacuation device for hydrogen production by methanol cracking according to claim 1, characterized by: An information processing module (14) is fixedly installed on the upper end of the hydrogen production and impurity removal tank (2) on the side of the pressure sensor (7). The information processing module (14) is electrically connected to the pressure sensor (7).

3. The multi-stage evacuation device for hydrogen production by methanol cracking according to claim 2, characterized in that: A communication module (15) is fixedly installed on the left side of the upper end of the information processing module (14), and an indicator light (16) is fixedly installed on the right side of the upper end of the information processing module (14).

4. The multi-stage evacuation device for hydrogen production by methanol cracking according to claim 3, characterized in that: The indicator light (16) and the communication module (15) are both electrically connected to the information processing module (14), and an air pump (17) is fixedly installed on the right side of the upper end of the hydrogen production and impurity removal tank (2).

5. The multi-stage evacuation device for hydrogen production by methanol cracking according to claim 1, characterized in that: The shock absorbers (10) are evenly spaced, the through holes (12) are evenly spaced, and the upper end of the mounting plate (11) is fixedly installed with a shock-absorbing pad (18).

6. The multi-stage evacuation device for hydrogen production by methanol cracking according to claim 5, characterized in that: The lower end of the pre-extraction mechanical pump (4) is fixedly connected to the shock-absorbing pad (18), and the lower end of the fine extraction molecular pump (6) is fixedly connected to the shock-absorbing pad (18).

7. The multi-stage evacuation device for methanol cracking to produce hydrogen according to claim 1, characterized in that: A sound-absorbing plate (19) is fixedly installed on the upper end of the mounting bracket (8), and a sound-absorbing hole (20) is opened on the inner side of the sound-absorbing plate (19).

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