Miniaturized methanol-to-hydrogen production device

Abstract

The present invention relates to the technical field of methanol hydrogen production equipment, and particularly relates to a miniaturized methanol hydrogen production device; it can improve the uniformity of contact between particulate catalysts and methanol and water vapor, enhance the effect of methanol cracking for hydrogen production, effectively prevent the agglomeration of particulate catalysts, and improve the hydrogen production efficiency; it includes a reaction tank, a vaporizer, and a circulating catalytic reactor. The vaporizer and the circulating catalytic reactor are both installed in the reaction tank. The circulating catalytic reactor includes a conical reaction housing fixedly installed in the reaction tank, a plurality of first screw conveyors, a pneumatic driving member, and a plurality of transmission components. The pneumatic driving member includes a mounting frame fixedly installed in the reaction tank, an axial flow impeller rotatably installed on the mounting frame, and a bevel gear disk fixedly installed at the top of the axial flow impeller. The transmission component includes a right-angle speed reducer fixedly installed outside the reaction tank, a radial shaft rotatably installed on the mounting frame, and a universal shaft. One end of the radial shaft is provided with a bevel gear meshing with the bevel gear disk.

Description

Technical Field

[0001] The present invention relates to the technical field of methanol-to-hydrogen production equipment, and particularly to a miniaturized methanol-to-hydrogen production device. Background Art

[0002] As is well known, the storage and transportation of hydrogen are the key links restricting the development of the hydrogen energy industry. Miniaturized on-site methanol hydrogen production can produce hydrogen within a limited site, providing a feasible solution to the difficulties of hydrogen storage and transportation;

[0003] Its reaction principle is as follows: Methanol cracking reaction: Methanol reacts with water vapor under the action of a catalyst to produce carbon monoxide and hydrogen. The reaction equation is: ; The generated carbon monoxide further reacts with water vapor to produce carbon dioxide and more hydrogen. The reaction equation is: ; Total reaction: Combining the above two reactions, the total reaction equation is: .

[0004] Chinese invention patent CN110386590B discloses a miniaturized methanol hydrogen production device, including a mixed liquid storage tank, a metering pump, a comprehensive reaction tank, a vaporization pipe, a cracking pipe, a heat transfer oil circulation system, a hydrogen storage pipe, and a waste heat recovery system. It omits a set of heating and vaporization devices, saving 50% of the steel and heat transfer oil consumption.

[0005] However, the methanol cracking hydrogen production reaction needs to contact with particulate catalysts, and the contact uniformity between the particulate catalysts and methanol and water vapor directly affects the reaction effect; currently, most of the particulate catalysts are zinc-chromium catalysts, copper-zinc catalysts, or copper-chromium catalysts. After being used for a period of time, the particulate catalysts are prone to caking, which affects the smooth passage of gas and ultimately affects the hydrogen production efficiency. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a miniaturized methanol hydrogen production device that improves the contact uniformity between particulate catalysts and methanol and water vapor, improves the methanol cracking hydrogen production effect, effectively prevents the caking of particulate catalysts, and improves the hydrogen production efficiency.

[0007] To achieve the above object, the present invention provides the following technical solution: A miniaturized methanol hydrogen production device, including a reaction tank, a vaporizer, and a circulating catalytic reactor. The vaporizer and the circulating catalytic reactor are both installed in the reaction tank. The vaporizer is used for heating and vaporizing methanol and water and raising the temperature and pressure required for the reaction.

[0008] The circulating catalytic reactor includes a conical reaction housing fixedly installed in the reaction tank, a plurality of first screw conveyors, a pneumatic driving member, and a plurality of transmission components. The output end of the vaporizer is communicated with the input end of the conical reaction housing, and the transmission component connects the first screw conveyor and the pneumatic driving member;

[0009] A concave aggregate ring portion is provided at the top of the conical reaction housing. A sieve cover that fits inside the concave aggregate ring portion is installed on the axial flow impeller. The small-diameter end of the conical reaction housing faces downward and is installed with a necking pipe. The plurality of first screw conveyors are circumferentially distributed around the reaction tank. The feeding ends of the first screw conveyors communicate with the inside of the concave aggregate ring portion, and the discharging ends of the first screw conveyors extend into the necking pipe.

[0010] Preferably, the pneumatic driving member includes a mounting frame fixedly installed in the reaction tank, an axial flow impeller rotatably installed on the mounting frame, and a bevel gear disk fixedly installed on the top of the axial flow impeller;

[0011] The transmission component includes a right-angle reduction gear fixedly installed outside the reaction tank, a radial shaft rotatably installed on the mounting frame, and a universal shaft. One end of the radial shaft is provided with a bevel gear meshing with the bevel gear disk. The other end of the radial shaft is drivingly connected to the input end of the right-angle reduction gear. The output end of the right-angle reduction gear is drivingly connected to the screw conveyor blade inside the first screw conveyor through the universal shaft.

[0012] Furthermore, the central axes of the reaction tank, the conical reaction housing, and the axial flow impeller coincide; a concave ring cavity is formed inside the concave aggregate ring portion; the feeding end of the first screw conveyor and the concave aggregate ring portion are communicated through a hopper.

[0013] Preferably, the pneumatic driving member is drivingly connected to the screw conveyor blade inside the first screw conveyor through a plurality of transmission components. The right-angle reduction gear is preferably a 90-degree bevel gear reduction gearbox; the radial shaft is arranged along the radial direction of the reaction tank. The lower part of the first screw conveyor is close to the center of the reaction tank, and the upper part of the first screw conveyor is far from the center of the reaction tank, that is, the first screw conveyor forms an angle of 30°-60° with the central axis of the reaction tank.

[0014] Preferably, the vaporizer includes a plurality of heaters, and the plurality of heaters are circumferentially distributed in the vaporization reaction housing; furthermore, the heater can adopt an electric heater, a steam heater, or other heating elements with equivalent heating effects.

[0015] Preferably, it also includes a material changer for catalyst replacement, the material changer includes a double-cone shell, a screen fixedly installed in the middle of the double-cone shell, a frustum fixedly installed in the middle of the screen, a scraping impeller rotatably installed on the frustum, a second screw conveyor and a storage tank, the two ends of the double-cone shell are respectively connected to the neck tube and the interior of the vaporization reaction shell, a through opening is provided at the connection between the second screw conveyor and the double-cone shell, a driving ring is fixedly installed on the top of the scraping impeller, the driving ring is provided with a plurality of tooth grooves that fit with the spiral conveying blades on the second screw conveyor, and the end of the second screw conveyor extends into the storage tank; further, the bottom of the scraping impeller is in close contact with the screen, the storage tank is fixedly installed on the vaporization reaction shell, and the spiral conveying blades on the second screw conveyor extend into the storage tank.

[0016] The connections between the double-cone shell, the second screw conveyor and the storage tank as well as the tank itself are sealed to prevent gas leakage; the reaction tank is provided with an inspection port arranged corresponding to the material changer, and an inspection door is hingedly installed at the inspection port.

[0017] Preferably, a supporting plate is installed in the material storage tank so as to slide up and down, and a plurality of lifting support members for driving the supporting plate to move up and down are installed on the inner bottom wall of the material storage tank; further, a slide rail is provided on the inner wall of the material storage tank, and the lifting support member slides up and down along the slide rail; the lifting support member is preferably a spring, and the supporting plate is in elastic contact with the inner bottom wall of the material storage tank through the spring; the lifting support member can also adopt a driving cylinder or other equivalent member that can drive the supporting plate to move up and down.

[0018] Preferably, the middle portion of the sieve cover is higher than the outer circular edge of the sieve cover, and the sieve cover is provided with a plurality of radially arranged strip sieve holes; further, the middle portion of the sieve cover is higher, and the edge of the sieve cover is inclined downward.

[0019] Preferably, it further comprises a preheater, a flow divider and a plurality of air guide pipes, the top of the reaction tank is provided with a first exhaust pipe connected to the interior of the reaction tank, and the gas outlet end of the first exhaust pipe extends into the flow divider;

[0020] The preheater includes an inner cylinder and a sleeve covering the outer wall of the inner cylinder. A sealed material storage cavity is formed between the inner cylinder and the sleeve. A plurality of gas guide pipes are spirally wound around the outer wall of the sleeve. One ends of the plurality of gas guide pipes are internally connected to the diverter, and the other ends of the plurality of gas guide pipes extend into the inner bottom of the inner cylinder. The inner cylinder is provided with a second exhaust pipe communicating with the upper part of the inner cylinder. The sleeve is provided with a methanol feed pipe and a pure water feed pipe communicating with the material storage cavity. The top of the inner cylinder is provided with a gas collecting housing, and the gas collecting housing is internally connected to the material storage cavity. The gas outlet end of the gas collecting housing is connected to the gas inlet end of the vaporizer; further, the gas outlet end of the second exhaust pipe extends outwards from the reaction tank, and the second exhaust pipe is connected to an external pressure swing adsorption device. The outer wall of the gas guide pipe and the outside of the reaction tank can be covered with heat insulation materials to reduce the loss of heat energy to the outside world.

[0021] Preferably, a plurality of communication pipes evenly distributed circumferentially around the sleeve are installed at the top of the sleeve. One ends of the plurality of communication pipes are connected to the material storage cavity, and the other ends of the plurality of communication pipes are internally connected to the gas collecting housing. Booster pumps are installed on the plurality of communication pipes, and a pressure regulating valve assembly is installed on the first exhaust pipe.

[0022] Further, the booster pump includes a pipeline fluid booster pump and a pipeline gas booster pump. The quantity and proportion of the pipeline fluid booster pump and the pipeline gas booster pump can be set according to actual requirements. A pressure gauge for detecting the pressure in the upper part of the reaction tank is provided on the pressure regulating valve assembly.

[0023] Preferably, an alkaline solution is contained in the inner cylinder, and the gas outlet end of the gas guide pipe is located below the liquid level of the alkaline solution.

[0024] Preferably, a feed and discharge pipe extending into the inner bottom of the inner cylinder is installed at the bottom of the reaction tank; further, a valve is installed on the feed and discharge pipe.

[0025] Compared with the prior art, the present invention provides a miniaturized methanol hydrogen production device, which has the following beneficial effects: in this miniaturized methanol hydrogen production device, methanol and pure water are vaporized, heated and pressurized through a vaporizer. The vaporized pressurized high-temperature mixed gas enters the necking pipe and contacts the catalyst particles. Under the action of the high-pressure gas flow, the catalyst particles rise in the conical reaction shell. The high-pressure gas flow drives the pneumatic driving part to rotate, forming a stirring effect on the gas flow in the conical reaction shell, further promoting the contact between the mixed gas and the catalyst, so as to improve the methanol cracking hydrogen production reaction effect.

[0026] The sieve cover blocks the movement of catalyst particles towards the upper part of the conical reaction housing. During the rotation of the sieve cover, the centrifugal force generated is greater than the frictional force between the catalyst particles and the sieve cover. The catalyst particles are thrown to the concave aggregate ring part and then enter the first screw conveyor. During the rotation of the pneumatic driving part, the first screw conveyor is driven to work through the transmission assembly. The first screw conveyor re-transports the catalyst particles into the shaft necking pipe. The catalyst particles move up and down, inside and outside in the conical reaction housing, realizing the dynamic contact between the catalyst housing and the mixed gas, improving the contact uniformity between the particulate catalyst and methanol and water vapor, enhancing the methanol cracking hydrogen production effect, effectively preventing the agglomeration of the particulate catalyst, and improving the hydrogen production efficiency.

[0027] The high-pressure air flow acts on the axial flow impeller to drive the axial flow impeller to rotate. During the rotation of the axial flow impeller, stirring is formed, and during the rotation of the axial flow impeller, the bevel gear disc is driven to rotate synchronously. After being transmitted through bevel gears, radial shafts, right-angle speed reducers, and universal shafts, the first screw conveyor is driven to work. Brief Description of the Drawings

[0028] Figure 1 is the external three-dimensional structure schematic diagram of the present invention.

[0029] Figure 2 is the internal sectional plane structure schematic diagram of the present invention.

[0030] Figure 3 is the three-dimensional structure schematic diagram at the conical reaction housing of the present invention.

[0031] Figure 4 is the internal perspective plane structure schematic diagram of the present invention.

[0032] Figure 5 is the Figure 2 sectional structure schematic diagram at A-A in the present invention.

[0033] Figure 6 is the Figure 1 locally enlarged structure schematic diagram at B in the present invention.

[0034] Figure 7 is the Figure 2 locally enlarged structure schematic diagram at C in the present invention.

[0035] Figure 8 is the Figure 4 locally enlarged structure schematic diagram at D in the present invention.

[0036] Figure 9 is the three-dimensional structure schematic diagram at the feeder of the present invention.

[0037] Figure 10 is the plane structure schematic diagram at the feeder of the present invention.

[0038] Figure 11 is of the present invention Figure 10 Schematic cross-sectional structure diagram at the E-E position in

[0039] Reference numerals in the drawings: 1, reaction tank; 2, conical reaction housing; 3, first screw conveyor; 4, mounting frame; 5, axial flow impeller; 6, bevel gear disc; 7, concave aggregate ring part; 8, sieve cover; 9, necking pipe; 10, right-angle reducer; 11, radial shaft; 12, universal shaft; 13, bevel gear; 14, vaporization reaction housing; 15, heater; 16, double-cone housing; 17, sieve mesh; 18, frustum; 19, scraping impeller; 20, second screw conveyor; 21, storage tank; 22, through port; 23, drive ring; 24, tooth groove; 25, supporting plate; 26, lifting support member; 27, strip-shaped sieve holes; 28, diverter; 29, gas guide pipe; 30, first exhaust pipe; 31, inner cylinder; 32, sleeve; 33, storage cavity; 34, second exhaust pipe; 35, methanol feed pipe; 36, pure water feed pipe; 37, gas collection housing; 38, connecting pipe; 39, booster pump; 40, pressure regulating valve assembly; 41, feed and discharge pipe; 42, screw conveyor blade. Detailed implementation manners

[0040] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments can be combined with each other.

[0042] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] Embodiment 1

[0044] Please refer to Figures 1 - 6 , a miniaturized methanol-to-hydrogen production device, which includes a reaction tank 1, a vaporizer and a circulating catalytic reactor. The vaporizer and the circulating catalytic reactor are both installed in the reaction tank 1. The vaporizer is used for heating and vaporizing methanol and water and raising the temperature and pressure required for the reaction.

[0045] The circulating catalytic reactor includes a conical reaction housing 2 fixedly installed in the reaction tank 1, a plurality of first screw conveyors 3, a pneumatic driving member, and a plurality of transmission components. The output end of the vaporizer is communicated with the input end of the conical reaction housing 2. The pneumatic driving member includes a mounting frame 4 fixedly installed in the reaction tank 1, an axial flow impeller 5 rotatably installed on the mounting frame 4, and a bevel gear disk 6 fixedly installed on the top of the axial flow impeller 5.

[0046] The transmission components include a right-angle speed reducer 10 fixedly installed outside the reaction tank 1, a radial shaft 11 rotatably installed on the mounting frame 4, and a universal shaft 12. One end of the radial shaft 11 is provided with a bevel gear 13 meshing with the bevel gear disk 6. The other end of the radial shaft 11 is drivingly connected to the input end of the right-angle speed reducer 10. The output end of the right-angle speed reducer 10 is drivingly connected to the screw conveyor blade 42 in the first screw conveyor 3 through the universal shaft 12.

[0047] The small-diameter end of the conical reaction housing 2 faces downward and is installed with a necking pipe 9. The plurality of first screw conveyors 3 are circumferentially distributed around the reaction tank 1. The feeding ends of the plurality of first screw conveyors 3 are all communicated with the inside of the downward concave aggregate ring part 7. The discharging ends of the plurality of first screw conveyors 3 all extend into the necking pipe 9.

[0048] The top of the conical reaction housing 2 is provided with a downward concave aggregate ring part 7. A sieve cover 8 that fits with the inside of the downward concave aggregate ring part 7 is installed on the axial flow impeller 5. Further, the central axes of the reaction tank 1, the conical reaction housing 2, and the axial flow impeller 5 coincide; a downward concave ring cavity is formed in the downward concave aggregate ring part 7; the feeding end of the first screw conveyor 3 and the downward concave aggregate ring part 7 are communicated through a hopper.

[0049] The pneumatic driving member is drivingly connected to the screw conveyor blade 42 in the first screw conveyor 3 through a plurality of transmission components. The right-angle speed reducer 10 is preferably a 90-degree bevel gear reduction gearbox; the radial shaft 11 is arranged along the radial direction of the reaction tank 1. The lower part of the first screw conveyor 3 is close to the center of the reaction tank 1, and the upper part of the first screw conveyor 3 is far from the center of the reaction tank 1, that is, the first screw conveyor 3 forms an angle of 30° - 60° with the central axis of the reaction tank 1.

[0050] Reference Figures 7 - 8 ; The sieve cover 8 is higher at the place close to the axial flow impeller 5 than the outer circular edge of the sieve cover 8. A plurality of strip-shaped sieve holes 27 are arranged on the sieve cover 8 along the radial direction of the axial flow impeller 5. Further, the middle of the sieve cover 8 is high, the edge of the sieve cover 8 slopes downward, and the width of the strip-shaped sieve holes 27 is smaller than the particle size of the catalyst particles.

[0051] Please refer to Figure 2 、 Figure 4; The vaporizer includes a plurality of heaters 15 fixedly installed on the vaporization reaction housing 14 and circumferentially and uniformly distributed within the vaporization reaction housing 14; further, the heaters 15 can be electric heaters, steam heaters or other heating elements with equivalent heating effects; different numbers of heaters 15 can be turned on simultaneously or intermittently according to requirements to adjust the temperature within the vaporization reaction housing 14, ensuring that the temperature of the mixed gas of vaporized gaseous methanol and water vapor is between 250 - 300 °C and the pressure is between 1 - 5 Mpa.

[0052] Specifically, please refer to Figure 2 , Figure 5 , this miniaturized methanol hydrogen production device further includes a preheater, a diverter 28 and a plurality of gas guide pipes 29. A first exhaust pipe 30 communicating with the interior of the reaction tank 1 is provided at the top of the reaction tank 1, and the outlet end of the first exhaust pipe 30 extends into the diverter 28; the preheater includes an inner cylinder 31 and a sleeve 32 covering the outer wall of the inner cylinder 31. A sealed storage cavity 33 is formed between the inner cylinder 31 and the sleeve 32. A plurality of gas guide pipes 29 are all spirally wound around the outer wall of the sleeve 32. One ends of the plurality of gas guide pipes 29 are all communicated with the interior of the diverter 28, and the other ends of the plurality of gas guide pipes 29 all extend into the inner bottom of the inner cylinder 31. A second exhaust pipe 34 communicating with the upper part of the inner cylinder 31 is provided on the inner cylinder 31. A methanol feed pipe 35 and a pure water feed pipe 36 communicating with the storage cavity 33 are provided on the sleeve 32. A gas collection housing 37 is installed at the top of the inner cylinder 31, and the gas collection housing 37 is communicated with the interior of the storage cavity 33. The outlet end of the gas collection housing 37 is communicated with the inlet end of the vaporizer.

[0053] The outlet end of the second exhaust pipe 34 extends outwards from the reaction tank 1, and the second exhaust pipe 34 is communicated with an external pressure swing adsorption device to purify hydrogen by using the external pressure swing adsorption device; the outer walls of the gas guide pipes 29 and the outside of the reaction tank 1 can be covered with heat insulation materials to reduce the loss of heat energy to the outside.

[0054] Specifically, please refer to Figure 4, a plurality of communication pipes 38 evenly distributed circumferentially around the sleeve 32 are installed at the top of the sleeve 32. One ends of the plurality of communication pipes 38 are all communicated with the material storage cavity 33, and the other ends of the plurality of communication pipes 38 are all communicated with the inside of the gas collecting housing 37. Booster pumps 39 are installed on the plurality of communication pipes 38, and a pressure regulating valve assembly 40 is installed on the first exhaust pipe 30; further, the booster pump 39 includes a pipeline fluid booster pump and a pipeline gas booster pump, and the quantity and proportion of the pipeline fluid booster pump and the pipeline gas booster pump can be set according to actual requirements. A pressure gauge for detecting the pressure in the upper part of the reaction tank 1 is provided on the pressure regulating valve assembly 40; furthermore, the pipeline fluid booster pump is turned on in the initial state to ensure that methanol and pure water in the material storage cavity 33 smoothly enter the vaporizer; when the reaction is in progress, the pipeline gas booster pump 39 is turned on to inject the preliminarily vaporized gas in the material storage cavity 33 into the vaporizer, and at the same time prevent the gas heated and pressurized in the vaporizer from flowing back to the material storage cavity 33 through the communication pipe 38.

[0055] In the miniaturized methanol hydrogen production device provided by this embodiment, the strip-shaped screen holes 27 allow gas to pass through, and the catalyst particles are intercepted in the screen cover 8. The strip-shaped screen holes 27 are arranged radially along the axial flow impeller 5, which can effectively reduce the friction between the catalyst particles and the screen cover 8, and is beneficial to the movement of the catalyst particles from the middle of the screen cover 8 to the edge of the screen cover 8 under the action of centrifugal force.

[0056] In the initial state, liquid pressurized methanol and pure water are respectively injected into the material storage cavity 33 through the methanol feed pipe 35 and the pure water feed pipe 36. The fluid enters the vaporizer through the communication pipe 38 and the gas collecting housing 37 for vaporization; when the methanol cracking reaction occurs and tends to be stable, normal pressure methanol and pure water are injected into the material storage cavity 33. The high-temperature hydrogen and carbon dioxide generated by the reaction are discharged from the first exhaust pipe 30, and then enter the inner cylinder 31 through the shunt 28 and the air guide pipe 29. The heated air guide pipe 29 and the inner cylinder 31 heat the material storage cavity 33, and use the waste heat of hydrogen and carbon dioxide to preheat and vaporize the methanol and pure water in the material storage cavity 33, reducing the energy consumption of the subsequent vaporizer. At the same time, use the methanol and pure water in the low-temperature state to cool the hydrogen and carbon dioxide. In this way, heat dissipation to the outside can be effectively reduced, more energy-saving, and the preliminary cooling of hydrogen and carbon dioxide gases can be achieved without external cooling equipment; the structural layout is simple and reasonable, effectively utilizing the space in the reaction tank 1, providing conditions for the volume reduction of this hydrogen production device.

[0057] Embodiment 2

[0058] Further optimize the miniaturized methanol hydrogen production device provided in Embodiment 1, refer to Figure 2 , an alkali solution covering the air outlet end of the air guide pipe 29 is contained in the inner cylinder 31. A feed and discharge pipe 41 extending to the bottom inside the inner cylinder 31 is installed at the bottom of the reaction tank 1; further, a valve is installed on the feed and discharge pipe 41.

[0059] In the miniaturized hydrogen production device provided in this embodiment, the mixed gas of hydrogen and carbon dioxide after the reaction enters the inner cylinder 31. The carbon dioxide reacts with the lye, and the carbon dioxide is neutralized and absorbed by the lye. The heat released during the neutralization reaction can further heat the inner cylinder 31, thereby heating the methanol and pure water liquid in the storage cavity 33, and realizing the removal of carbon dioxide gas in the reaction product; the thermal energy is utilized to the maximum extent, further improving the energy-saving effect of the hydrogen production device, and making full use of the internal space of the device. The carbon dioxide absorption system is built into the reaction tank 1 without occupying too much space; the lye can be added to the inner cylinder 31 or the reacted liquid can be discharged through the feed and discharge pipe 41.

[0060] Embodiment 3

[0061] The miniaturized hydrogen production device provided in Embodiment 2 is further optimized. Specifically, please refer to Figures 7 - 11 , and it further includes a feeder for catalyst replacement. The feeder includes a double-cone housing 16, a screen 17 fixedly installed in the middle of the double-cone housing 16, a frustum 18 fixedly installed in the middle of the screen 17, a scraping impeller 19 rotatably installed on the frustum 18, a second screw conveyor 20 and a storage tank 21. The two ends of the double-cone housing 16 are respectively internally connected to the necking pipe 9 and the vaporization reaction housing 14. A through port 22 is provided at the connection between the second screw conveyor 20 and the double-cone housing 16. A driving ring 23 is fixedly installed at the top of the scraping impeller 19, and a plurality of tooth grooves 24 that fit with the screw conveyor blades 42 on the second screw conveyor 20 are provided on the driving ring 23. The end of the second screw conveyor 20 extends into the storage tank 21; further, the bottom of the scraping impeller 19 is in close contact with the screen 17, the storage tank 21 is fixedly installed on the vaporization reaction housing 14, and the screw conveyor blades 42 on the second screw conveyor 20 extend into the storage tank 21; the connections between the double-cone housing 16, the second screw conveyor 20 and the storage tank 21 and themselves are all sealed to prevent gas leakage; a maintenance port corresponding to the feeder is provided at the reaction tank 1, and a maintenance door is hingedly installed at the maintenance port.

[0062] Refer to Figure 11 ; a supporting plate 25 is slidably installed up and down in the storage tank 21, and a plurality of lifting supports 26 for driving the supporting plate 25 to move up and down are installed at the bottom wall of the storage tank 21; further, slide rails are provided on the inner wall of the storage tank 21, and the lifting supports 26 slide up and down along the slide rails; the lifting supports 26 are preferably springs, and the supporting plate 25 is elastically in contact with the bottom wall of the storage tank 21 through the springs; the lifting supports 26 can also be driving cylinders or other equivalent parts that can drive the supporting plate 25 to move up and down.

[0063] In the miniaturized methanol hydrogen production device provided in this embodiment, when the catalyst needs to be replaced, the vaporizer stops heating the gas, the pressure in the conical reaction shell 2 decreases, the gravity of the catalyst particles is greater than the gas flow pressure, and the catalyst particles in the conical reaction shell 2 of the catalyst fall to the screen 17. Under the action of inertia, the axial flow impeller 5 continues to rotate, so that the catalyst particles in the first screw conveyor 3 are emptied; then the second screw conveyor 20 is started, and during the rotation of the screw conveyor blade 42 on the second screw conveyor 20, the drive ring 23 is driven to rotate the scraping impeller 19 to Figure 9 refer to Figure 9 , rotate forward in the direction shown in the figure. The drive ring 23 drives the scraping impeller 19 to rotate, and the scraping impeller 19 scrapes the granular catalyst at the screen 17 to the through port 22. The catalyst particles enter the second screw conveyor 20 through the through port 22. The screw conveyor blade 42 in the second screw conveyor 20 sends the catalyst particles into the storage tank 21; the operator opens the inspection door, replaces the catalyst particles in the storage tank 21, and then the second screw conveyor 20 rotates in the reverse direction. The screw conveyor blade 42 transports the catalyst particles in the storage tank 21 to the through port 22, and the scraping impeller 19 rotates in the reverse direction. Under the action of the scraping impeller 19, the granular catalyst enters the middle of the screen 17. The rapid replacement of the catalyst particles can be realized without disassembling the machine, which greatly improves the convenience of replacing the catalyst particles and shortens the replacement operation time of the catalyst particles; as the granular catalyst enters the storage tank 21, the weight at the material supporting plate 25 gradually increases, the spring compresses, and the material supporting plate 25 gradually moves downward, avoiding the accumulation of a large amount of granular catalyst at the discharge port of the second screw conveyor 20 to prevent the piled-up granular catalyst from interfering with the smooth discharge of the second screw conveyor 20; similarly, when loading the granular catalyst in the storage tank 21, as the granular catalyst at the material supporting plate 25 decreases, the material supporting plate 25 gradually moves upward to ensure that the second screw conveyor 20 smoothly loads the granular catalyst in the storage tank 21, effectively reducing the residue of the granular catalyst in the storage tank 21.

[0064] The usage process of the miniaturized methanol hydrogen production device provided by the present invention is as follows: Initially, methanol and pure water in a specific ratio are injected into the storage chamber and the vaporizer through the methanol feed pipe 35 and the pure water feed pipe 36. The methanol and pure water solution is vaporized and heated by the vaporizer. The pressurized high-temperature mixed gas after vaporization enters the necking pipe 9 and contacts the catalyst particles. Under the action of the high-pressure gas flow, the catalyst particles rise in the conical reaction housing 2. The high-pressure gas flow acts on the axial flow impeller 5 to drive the axial flow impeller 5 to rotate. During the rotation of the axial flow impeller 5, the gas in the conical reaction housing 2 is agitated; the sieve cover 8 blocks the upward movement of the catalyst particles in the conical reaction housing 2. The centrifugal force generated during the rotation of the axial flow impeller 5 driving the sieve cover 8 is greater than the frictional force between the catalyst particles and the sieve cover 8. The catalyst particles are thrown to the concave aggregate ring part 7 and then enter the first screw conveyor 3. During the rotation of the axial flow impeller 5, the bevel gear disk 6 is driven to rotate synchronously. After being transmitted by the bevel gear 13, the radial shaft 11, the right-angle reducer 10, and the universal shaft 12, the first screw conveyor 3 re-transports the catalyst particles into the necking pipe 9. The catalyst particles move up and down, inside and outside in the conical reaction housing 2, realizing the dynamic contact between the catalyst housing and the mixed gas. The hydrogen and carbon dioxide mixed gas generated after the reaction is introduced into the inner cylinder 31 through the air guide pipe 29. The alkali solution in the inner cylinder 31 absorbs the carbon dioxide gas, and the preliminarily purified hydrogen is introduced into the subsequent pressure swing adsorber through the second exhaust pipe 34 for further purification.

[0065] In the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A miniaturized methanol hydrogen production device, characterized in that: The invention comprises a reaction tank (1), a vaporizer and a circulating catalytic reactor, wherein the vaporizer and the circulating catalytic reactor are both installed in the reaction tank (1), the circulating catalytic reactor comprises a conical reaction shell (2) fixedly installed in the reaction tank (1), a plurality of first screw conveyors (3), a pneumatic drive element and a plurality of transmission components, the output end of the vaporizer is connected to the input end of the conical reaction shell (2), and the transmission component connects the first screw conveyors (3) and the pneumatic drive element; The top of the conical reaction shell (2) is provided with a concave material collection ring (7), the pneumatic drive member is provided with a screen cover (8) which fits in the interior of the concave material collection ring (7), the small aperture end of the conical reaction shell (2) faces downward and is provided with a neck reduction tube (9), a plurality of the first screw conveyors (3) are evenly distributed around the circumference of the reaction tank (1), the feed ends of the first screw conveyors (3) are all in communication with the interior of the concave material collection ring (7), and the discharge ends of the first screw conveyors (3) extend into the neck reduction tube (9); It also includes a material changer for catalyst replacement, the material changer including a double-cone shell (16), a screen (17) fixedly mounted in the middle of the double-cone shell (16), a cone (18) fixedly mounted in the middle of the screen (17), a scraping impeller (19) rotatably mounted on the cone (18), a second screw conveyor (20) and a storage tank (21), the two ends of the double-cone shell (16) are respectively connected to the neck tube (9) and the inside of the vaporization reaction shell (14), a through opening (22) is provided at the connection between the second screw conveyor (20) and the double-cone shell (16), a driving ring (23) is fixedly mounted on the top of the scraping impeller (19), and a plurality of tooth grooves (24) are provided on the driving ring (23) that fit with the spiral conveying blades (42) on the second screw conveyor (20), and the end of the second screw conveyor (20) extends into the storage tank (21); A supporting plate (25) is slidably mounted in the material storage tank (21) up and down, and a plurality of lifting support members (26) are mounted on the bottom wall of the material storage tank (21) for driving the supporting plate (25) to move up and down.

2. The miniaturized methanol-to-hydrogen device according to claim 1, characterized in that: The pneumatic drive element comprises a mounting frame (4) fixedly mounted in the reaction tank (1), an axial flow impeller (5) rotatably mounted on the mounting frame (4), and a bevel gear disc (6) fixedly mounted on the top of the axial flow impeller (5); The transmission assembly comprises a right-angle reducer (10) fixedly mounted on the outside of the reaction tank (1), a radial shaft (11) and a universal shaft (12) rotatably mounted on a mounting frame (4); one end of the radial shaft (11) is provided with a bevel gear (13) meshing with a bevel gear plate (6); the other end of the radial shaft (11) is transmission-connected to an input end of the right-angle reducer (10); and the output end of the right-angle reducer (10) is transmission-connected to a spiral conveying blade (42) in a first spiral conveyor (3) via the universal shaft (12).

3. The miniaturized methanol-to-hydrogen device according to claim 1, characterized in that: The vaporizer comprises a plurality of heaters (15), and the plurality of heaters (15) are evenly distributed circumferentially within a vaporization reaction shell (14).

4. The miniaturized methanol-to-hydrogen device according to claim 1, characterized in that: The middle portion of the sieve cover (8) is higher than the outer circular edge of the sieve cover (8), and the sieve cover (8) is provided with a plurality of strip-shaped sieve holes (27) arranged radially.

5. The miniaturized methanol-to-hydrogen device according to claim 1, characterized in that: It also includes a preheater, a flow divider (28) and a plurality of air guide pipes (29); a first exhaust pipe (30) communicating with the interior of the reaction tank (1) is provided on the top of the reaction tank (1); an exhaust end of the first exhaust pipe (30) extends into the flow divider (28); The preheater comprises an inner cylinder (31) and a sleeve (32) covering the outer wall of the inner cylinder (31); a sealed material storage chamber (33) is formed between the inner cylinder (31) and the sleeve (32); a plurality of air guide pipes (29) are spirally wound around the outer wall of the sleeve (32); one end of the plurality of air guide pipes (29) are communicated with the interior of a flow divider (28); the other ends of the plurality of air guide pipes (29) extend into the bottom of the inner cylinder (31); a second exhaust pipe (34) is provided on the inner cylinder (31) and is communicated with the upper part of the inner cylinder (31); a methanol feed pipe (35) and a pure water feed pipe (36) are provided on the sleeve (32) and are communicated with the material storage chamber (33); a gas collecting shell (37) is installed on the top of the inner cylinder (31); the gas collecting shell (37) is communicated with the interior of the material storage chamber (33); and a gas outlet end of the gas collecting shell (37) is communicated with a gas inlet end of a vaporizer.

6. The miniaturized methanol-to-hydrogen device according to claim 5, characterized in that: A plurality of connecting tubes (38) evenly distributed around the circumference of the sleeve (32) are installed on the top of the sleeve (32); one end of the plurality of connecting tubes (38) is connected to the material storage chamber (33); the other end of the plurality of connecting tubes (38) is connected to the interior of the gas collecting shell (37); a booster pump (39) is installed on the plurality of connecting tubes (38); and a pressure regulating valve assembly (40) is installed on the first exhaust pipe (30).

7. The miniaturized methanol-to-hydrogen device according to claim 6, characterized in that: The inner cylinder (31) contains alkali liquid, and the gas outlet end of the gas guide pipe (29) is located below the liquid level of the alkali liquid.

8. The miniaturized methanol-to-hydrogen device according to claim 1, characterized in that: The bottom of the reaction tank (1) is provided with a feed and discharge pipe (41) extending into the bottom of the inner cylinder (31).

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