Miniaturized methanol hydrogen production device

Abstract

The invention relates to the technical field of methanol-to-hydrogen equipment, in particular to a miniaturized methanol-to-hydrogen device. The contact uniformity of the granular catalyst with methanol and water vapor can be improved, the methanol cracking hydrogen production effect is improved, the granular catalyst is effectively prevented from hardening, and the hydrogen production efficiency is improved; comprising a reaction tank, a vaporizer and a circulating catalytic reactor, the vaporizer and the circulating catalytic reactor are both installed in the reaction tank, and the circulating catalytic reactor comprises a conical reaction shell fixedly installed in the reaction tank, a plurality of first spiral conveyors, a pneumatic driving part and a plurality of transmission assemblies; the pneumatic driving part comprises a mounting frame fixedly mounted in the reaction tank, an axial flow impeller rotationally mounted on the mounting frame and a bevel gear disc fixedly mounted at the top of the axial flow impeller; the transmission assembly comprises a right-angle speed reducer fixedly mounted outside the reaction tank, and a radial shaft and a universal shaft which are rotationally mounted on the mounting frame; and one end of the radial shaft is provided with a bevel gear meshed with the bevel gear disc.

Description

Technical Field

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

[0002] As we all know, the storage and transportation of hydrogen are key links that restrict the development of the hydrogen energy industry. Small-scale methanol on-site hydrogen production can produce hydrogen in a limited area, providing a feasible solution to the difficulties in hydrogen storage and transportation; The reaction principle is: methanol cracking reaction: methanol reacts with water vapor under the action of a catalyst to generate carbon monoxide and hydrogen. The reaction equation is: The generated carbon monoxide further reacts with water vapor to generate carbon dioxide and more hydrogen. The reaction equation is: ; Overall reaction: Combining the above two reactions, the overall reaction equation is: .

[0003] Chinese invention patent CN110386590B discloses a small methanol hydrogen production device, including a mixed liquid storage tank, a metering pump, a comprehensive reaction tank, a vaporization tube, a cracking tube, a heat transfer oil circulation system, a hydrogen storage tube and a waste heat recovery system. It saves a set of heating vaporization devices and saves 50% of steel and heat transfer oil consumption.

[0004] However, the methanol cracking reaction to produce hydrogen requires contact with a particle catalyst, and the uniformity of contact between the particle catalyst and methanol and water vapor directly affects the reaction effect; and the current particle catalysts mostly use zinc-chromium catalysts, copper-zinc catalysts or copper-chromium catalysts. After a period of use, the particle catalysts are prone to hardening, thereby affecting the smooth passage of the gas and ultimately affecting the hydrogen production efficiency. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a miniaturized methanol hydrogen production device which improves the uniformity of contact between a particle catalyst and methanol and water vapor, improves the effect of hydrogen production by methanol cracking, effectively prevents the particle catalyst from agglomerating, and improves the hydrogen production efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a miniaturized methanol hydrogen production device, comprising a reaction tank, a vaporizer and a circulating catalytic reactor, wherein the vaporizer and the circulating catalytic reactor are both installed in the reaction tank, and the vaporizer is used for heating and vaporizing methanol and water and increasing the temperature and pressure required for the reaction.

[0007] The circulating catalytic reactor comprises a conical reaction shell fixedly installed in the reaction tank, a plurality of first screw conveyors, a pneumatic drive member and a plurality of transmission components, the output end of the vaporizer is connected to the input end of the conical reaction shell, and the transmission component connects the first screw conveyor and the pneumatic drive member; A concave material collecting ring is provided on the top of the conical reaction shell, a screen cover which fits with the inside of the concave material collecting ring is installed on the axial flow impeller, the small aperture end of the conical reaction shell faces downward and is installed with a neck reduction tube, a plurality of the first screw conveyors are evenly distributed around the circumference of the reaction tank, the feed ends of the first screw conveyors are all connected with the inside of the concave material collecting ring, and the discharge ends of the first screw conveyors extend into the neck reduction tube.

[0008] Preferably, the pneumatic drive member comprises a mounting frame fixedly mounted in the reaction tank, an axial flow impeller rotatably mounted on the mounting frame, and a bevel gear disk fixedly mounted on the top of the axial flow impeller; The transmission assembly includes a right-angle reducer fixedly installed on the outside of the reaction tank, a radial shaft and a universal shaft rotatably installed on a mounting frame, one end of the radial shaft is provided with a bevel gear meshing with a bevel gear plate, the other end of the radial shaft is transmission-connected to the input end of the right-angle reducer, and the output end of the right-angle reducer is transmission-connected to the spiral conveying blades in the first spiral conveyor through the universal shaft.

[0009] Furthermore, the central axes of the reaction tank, the conical reaction shell and the axial flow impeller coincide with each other; a concave annular cavity is formed in the concave material collecting ring portion; and the feed end of the first screw conveyor and the concave material collecting ring portion are connected through a material collecting hopper.

[0010] Preferably, the pneumatic drive is connected to the spiral conveying blades in the first screw conveyor through multiple transmission components, and the right-angle reducer 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 away from the center of the reaction tank, that is, the first screw conveyor and the central axis of the reaction tank form an angle of 30°-60°.

[0011] Preferably, the vaporizer includes a plurality of heaters, and the plurality of heaters are evenly distributed circumferentially in the vaporization reaction shell; further, the heater may be an electric heater, a steam heater or other heating element with an equivalent heating effect.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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; The preheater includes an inner cylinder and a sleeve covering the outer wall of the inner cylinder, a closed storage chamber is formed between the inner cylinder and the sleeve, a plurality of air guide pipes are spirally coiled around the outer wall of the sleeve, one end of the plurality of air guide pipes are connected to the inside of the diverter, and the other ends of the plurality of air guide pipes extend to the bottom of the inner cylinder, a second exhaust pipe connected to the upper part of the inner cylinder is provided on the inner cylinder, a methanol feed pipe and a pure water feed pipe connected to the storage chamber are provided on the sleeve, a gas collecting shell is installed on the top of the inner cylinder, the gas collecting shell is connected to the inside of the storage chamber, and the gas outlet end of the gas collecting shell is connected to the gas inlet end of the vaporizer; further, the gas outlet end of the second exhaust pipe extends outward from the reaction tank, and the second exhaust pipe is connected to an external pressure swing adsorber; the outer wall of the air guide pipe and the outside of the reaction tank can be coated with insulation material to reduce the loss of heat energy to the outside.

[0017] Preferably, a plurality of connecting tubes evenly distributed around the circumference of the sleeve are installed on the top of the sleeve, one end of the plurality of connecting tubes are connected to the material storage chamber, the other end of the plurality of connecting tubes are connected to the inside of the gas collecting shell, a boosting pump is installed on the plurality of connecting tubes, and a pressure regulating valve assembly is installed on the first exhaust pipe.

[0018] Furthermore, the booster pump includes a pipeline fluid booster pump and a pipeline gas booster pump. The number and ratio of the pipeline fluid booster pump and the pipeline gas booster pump can be set according to actual needs. The pressure regulating valve assembly is provided with a pressure gauge for detecting the upper pressure of the reaction tank.

[0019] Preferably, the inner cylinder contains alkali solution, and the gas outlet end of the air guide pipe is located below the liquid level of the alkali solution.

[0020] Preferably, a feed and discharge pipe extending into the 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.

[0021] Compared with the prior art, the present invention provides a miniaturized methanol hydrogen production device, which has the following beneficial effects: the miniaturized methanol hydrogen production device vaporizes, heats and pressurizes methanol and pure water through a vaporizer, and the vaporized pressurized high-temperature mixed gas enters the neck tube and contacts the catalyst particles, and the catalyst particles rise in the conical reaction shell under the action of the high-pressure airflow, and the high-pressure airflow drives the pneumatic drive member to rotate, forming a stirring effect on the airflow 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.

[0022] The screen cover blocks the catalyst particles from moving toward the upper part of the conical reaction shell. The centrifugal force generated during the rotation of the screen cover is greater than the friction between the catalyst particles and the screen cover. The catalyst particles are thrown to the concave aggregate ring and then enter the first screw conveyor. The pneumatic drive component drives the first screw conveyor to work through the transmission assembly during the rotation of the pneumatic drive component. The first screw conveyor re-conveys the catalyst particles into the axial neck tube. The catalyst particles circulate up and down and inside and outside in the conical reaction shell, thereby realizing dynamic contact between the catalyst shell and the mixed gas, improving the uniformity of contact between the particle catalyst and methanol and water vapor, improving the effect of hydrogen production by methanol cracking, effectively preventing the particle catalyst from caking, and improving the hydrogen production efficiency.

[0023] The high-pressure airflow acts on the axial flow impeller to drive the axial flow impeller to rotate, forming stirring during the rotation of the axial flow impeller, and the axial flow impeller drives the bevel gear plate to rotate synchronously during the rotation of the axial flow impeller, and after being transmitted by the bevel gear, radial shaft, right-angle reducer and universal shaft, the first screw conveyor is driven to work. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the external three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the internal cutaway plan structure of the present invention.

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the conical reaction shell of the present invention.

[0027] Figure 4 It is a schematic diagram of the internal perspective plan structure of the present invention.

[0028] Figure 5 The present invention Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle.

[0029] Figure 6 The present invention Figure 1 Schematic diagram of the local enlarged structure at point B in the middle.

[0030] Figure 7 The present invention Figure 2 Schematic diagram of the partial enlarged structure at point C in the middle.

[0031] Figure 8 The present invention Figure 4 Schematic diagram of the local enlarged structure at point D in the middle.

[0032] Fig. 9 It is a schematic diagram of the three-dimensional structure of the material changer of the present invention.

[0033] Fig.10 It is a schematic diagram of the planar structure of the material changer of the present invention.

[0034] Fig.11 The present invention Fig.10 Schematic diagram of the cross-sectional structure at EE.

[0035] Markings in the attached drawings: 1, reaction tank; 2, conical reaction shell; 3, first screw conveyor; 4, mounting frame; 5, axial flow impeller; 6, bevel gear plate; 7, concave collecting ring; 8, screen cover; 9, neck reduction tube; 10, right-angle reducer; 11, radial shaft; 12, universal shaft; 13, bevel gear; 14, vaporization reaction shell; 15, heater; 16, double cone shell; 17, screen; 18, cone; 19, scraping impeller; 20, second screw conveyor; 21, storage Tank; 22, through port; 23, drive ring; 24, tooth groove; 25, support plate; 26, lifting support; 27, strip sieve hole; 28, diverter; 29, air guide pipe; 30, first exhaust pipe; 31, inner tube; 32, sleeve; 33, storage chamber; 34, second exhaust pipe; 35, methanol feed pipe; 36, pure water feed pipe; 37, gas collecting shell; 38, connecting pipe; 39, booster pump; 40, pressure regulating valve assembly; 41, feed and discharge pipe; 42, spiral conveying blade. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] Example 1 Please refer to Figure 1-Figure 6 A miniaturized methanol hydrogen production device 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 increasing the temperature and pressure required for the reaction.

[0040] The circulating catalytic reactor includes a conical reaction shell 2 fixedly installed in a reaction tank 1, a plurality of first screw conveyors 3, a pneumatic drive component and a plurality of transmission components, the output end of the vaporizer is connected to the input end of the conical reaction shell 2, wherein the pneumatic drive component 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 disc 6 fixedly installed on the top of the axial flow impeller 5.

[0041] The transmission assembly includes 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 the mounting frame 4, one end of the radial shaft 11 is provided with a bevel gear 13 meshing with the bevel gear plate 6, the other end of the radial shaft 11 is transmission-connected to the input end of the right-angle reducer 10, and the output end of the right-angle reducer 10 is transmission-connected to the spiral conveying blade 42 in the first spiral conveyor 3 through the universal shaft 12.

[0042] One end of the conical reaction shell 2 with a small aperture faces downward and is equipped with a necking tube 9. Multiple first screw conveyors 3 are evenly distributed around the reaction tank 1. The feed ends of the multiple first screw conveyors 3 are all connected to the inside of the concave collection ring 7, and the discharge ends of the multiple first screw conveyors 3 extend into the necking tube 9.

[0043] A concave material collection ring 7 is provided on the top of the conical reaction shell 2, and a screen cover 8 is installed on the axial flow impeller 5 to fit the inside of the concave material collection ring 7. Further, the central axes of the reaction tank 1, the conical reaction shell 2 and the axial flow impeller 5 coincide with each other; a concave annular cavity is formed in the concave material collection ring 7; and the feed end of the first screw conveyor 3 and the concave material collection ring 7 are connected through a material collection hopper.

[0044] The pneumatic drive is connected to the spiral conveying blade 42 in the first spiral conveyor 3 through multiple transmission components. The right-angle 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 spiral conveyor 3 is close to the center of the reaction tank 1, and the upper part of the first spiral conveyor 3 is far away from the center of the reaction tank 1, that is, the first spiral conveyor 3 and the central axis of the reaction tank 1 form an angle of 30°-60°.

[0045] refer to Figure 7-Figure 8 ; The sieve cover 8 is higher than the outer edge of the sieve cover 8 near the axial flow impeller 5, and the sieve cover 8 is provided with a plurality of strip sieve holes 27 arranged along the radial direction of the axial flow impeller 5; further, the middle part of the sieve cover 8 is high, and the edge of the sieve cover 8 is inclined downward, and the width of the strip sieve holes 27 is smaller than the particle size of the catalyst particles.

[0046] Please refer to Figure 2 , Figure 4 The vaporizer includes a plurality of heaters 15 fixedly mounted on a vaporization reaction shell 14 and uniformly distributed circumferentially in the vaporization reaction shell 14; further, the heater 15 may be an electric heater, a steam heater or other heating element with an equivalent heating effect; different numbers of heaters 15 may be turned on simultaneously or intermittently as required to adjust the temperature in the vaporization reaction shell 14 to ensure that the temperature of the vaporized gaseous methanol and water vapor mixture is between 250-300°C and the pressure is between 1-5Mpa.

[0047] For details, please refer to Figure 2 , Figure 5The miniaturized methanol hydrogen production device also includes a preheater, a splitter 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, and the gas outlet end of the first exhaust pipe 30 extends into the splitter 28; the preheater includes an inner cylinder 31 and a sleeve 32 covering the outer wall of the inner cylinder 31, and a closed material storage chamber 33 is formed between the inner cylinder 31 and the sleeve 32. The plurality of air guide pipes 29 are all spirally coiled around the outer wall of the sleeve 32. One end of each of the gas pipes 29 is connected to the interior of the diverter 28, and the other ends of the multiple gas guide pipes 29 are extended to the bottom of the inner tube 31. The inner tube 31 is provided with a second exhaust pipe 34 connected to the upper part of the inner tube 31, and the sleeve 32 is provided with a methanol feed pipe 35 and a pure water feed pipe 36 connected to the storage chamber 33. A gas collecting shell 37 is installed on the top of the inner tube 31, and the gas collecting shell 37 is connected to the interior of the storage chamber 33. The gas outlet end of the gas collecting shell 37 is connected to the gas inlet end of the vaporizer.

[0048] The gas outlet end of the second exhaust pipe 34 extends outward from the reaction tank 1, and the second exhaust pipe 34 is connected to an external pressure swing adsorber, and the external pressure swing adsorber is used to purify the hydrogen; the outer wall of the air guide pipe 29 and the outside of the reaction tank 1 can be covered with insulation material to reduce the loss of heat energy to the outside.

[0049] For details, please refer to Figure 4 , a plurality of connecting pipes 38 uniformly distributed around the circumference of the sleeve 32 are installed on the top of the sleeve 32, one end of the plurality of connecting pipes 38 are connected to the storage chamber 33, and the other end of the plurality of connecting pipes 38 are connected to the inside of the gas collecting shell 37, a booster pump 39 is installed on the plurality of connecting 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, the number and ratio of the pipeline fluid booster pump and the pipeline gas booster pump can be set according to actual needs, and the pressure regulating valve assembly 40 is provided with a pressure gauge for detecting the upper pressure of the reaction tank 1; further, in the initial state, the pipeline fluid booster pump is turned on to ensure that the methanol and pure water in the storage chamber 33 smoothly enter the vaporizer; when the reaction is in progress, the other booster pumps 39 of the pipeline are turned on to inject the gas initially vaporized in the storage chamber 33 into the vaporizer, while preventing the gas heated and pressurized in the vaporizer from flowing back into the storage chamber 33 through the connecting pipe 38.

[0050] In the miniaturized methanol hydrogen production device provided in this embodiment, the strip sieve holes 27 allow gas to pass through, and the catalyst particles are retained in the sieve cover 8. The strip sieve holes 27 are arranged along the radial direction of the axial flow impeller 5, which can effectively reduce the friction between the catalyst particles and the sieve cover 8, and facilitate the catalyst particles to move from the middle of the sieve cover 8 to the edge of the sieve cover 8 under the action of centrifugal force.

[0051] In the initial state, liquid pressurized methanol and pure water are respectively injected into the storage chamber 33 through the methanol feed pipe 35 and the pure water feed pipe 36, and the fluid enters the vaporizer through the connecting pipe 38 and the gas collecting shell 37 for vaporization; when the methanol cracking reaction occurs and tends to be stable, normal pressure methanol and pure water are injected into the storage chamber 33, and 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 splitter 28 and the air guide pipe 29. The heated air guide pipe 29 and the inner cylinder 31 The storage chamber 33 is heated, and the waste heat of hydrogen and carbon dioxide is used to preheat and vaporize the methanol and pure water in the storage chamber 33, thereby reducing the energy consumption of the subsequent vaporizer. At the same time, the low-temperature methanol and pure water are used to cool the hydrogen and carbon dioxide, which can effectively reduce the heat loss to the outside, is more energy-saving, and the initial cooling of the hydrogen and carbon dioxide gases can be achieved without external cooling equipment; the structural layout is simple and reasonable, and the space in the reaction tank 1 is effectively utilized, providing conditions for reducing the volume of the hydrogen production device.

[0052] Example 2 The miniaturized methanol hydrogen production device provided in Example 1 is further optimized, referring to Figure 2 The inner cylinder 31 contains alkali solution that covers the outlet end of the air guide pipe 29. The bottom of the reaction tank 1 is equipped with a feed and discharge pipe 41 extending into the bottom of the inner cylinder 31; further, a valve is installed on the feed and discharge pipe 41.

[0053] In the miniaturized methanol hydrogen production device provided in the present embodiment, the hydrogen and carbon dioxide mixed gas after the reaction enters the inner cylinder 31, the carbon dioxide reacts with the alkali solution, and the carbon dioxide is neutralized and absorbed by the alkali solution. 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 chamber 33, and achieving the removal of carbon dioxide gas in the reaction product; the thermal energy is utilized to the maximum extent, the energy-saving effect of the hydrogen production device is further improved, and the internal space of the device is fully utilized, and the carbon dioxide absorption system is built into the reaction tank 1 without occupying too much space; the alkali solution can be added to the inner cylinder 31 or the liquid after the reaction can be discharged through the feed and discharge pipe 41.

[0054] Example 3 The miniaturized methanol hydrogen production device provided in Example 2 is further optimized. For details, please refer to Figure 7-Figure 11, and also includes a material changer for catalyst replacement, the material changer includes a double-cone shell 16, a screen 17 fixedly installed in the middle of the double-cone shell 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 shell 16 are respectively connected to the neck tube 9 and the inside of the vaporization reaction shell 14, a through port 22 is provided at the connection between the second screw conveyor 20 and the double-cone shell 16, a driving ring 23 is fixedly installed on the top of the scraping impeller 19, and a driving ring 23 is provided on the driving ring 23 to communicate with the second screw conveyor 20 The spiral conveying blades 42 on the second screw conveyor 20 fit into multiple tooth grooves 24, and the end of the second screw conveyor 20 extends into the storage tank 21; further, the bottom of the scraper impeller 19 is in close contact with the screen 17, the storage tank 21 is fixedly mounted on the vaporization reaction shell 14, and the spiral conveying blades 42 on the second screw conveyor 20 extend into the storage tank 21; the connection between the double-conical shell 16, the second screw conveyor 20 and the storage tank 21 and the second screw conveyor 20 are sealed to prevent gas leakage; the reaction tank 1 is provided with an inspection port arranged corresponding to the material changer, and an inspection door is hingedly installed at the inspection port.

[0055] refer to Fig.11 ; A supporting plate 25 is installed in the storage tank 21 so as to slide up and down, and a plurality of lifting support members 26 for driving the supporting plate 25 to move up and down are installed on the inner bottom wall of the storage tank 21; further, a slide rail is provided on the inner wall of the storage tank 21, and the lifting support member 26 slides up and down along the slide rail; the lifting support member 26 is preferably a spring, and the supporting plate 25 is in elastic contact with the inner bottom wall of the storage tank 21 through the spring; the lifting support member 26 can also adopt a driving cylinder or other equivalent parts that can drive the supporting plate 25 to move up and down.

[0056] 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 air flow pressure, and the catalyst particles in the catalyst conical reaction shell 2 fall to the screen 17, and 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 completely discharged; then the second screw conveyor 20 is started, and the screw conveying blades 42 on the second screw conveyor 20 drive the drive ring 23 to rotate the scraper impeller 19 during the rotation process to Fig. 9For reference, rotate forward in the direction shown in the figure, the drive ring 23 drives the scraper impeller 19 to rotate, the scraper impeller 19 scrapes the catalyst particles at the screen 17 to the opening 22, and the catalyst particles enter the second screw conveyor 20 through the opening 22. The spiral conveying blades 42 in the second screw conveyor 20 deliver the catalyst particles to the storage tank 21; the operator opens the inspection door, replaces the catalyst particles in the storage tank 21, and the second screw conveyor 20 rotates in the opposite direction, the spiral conveying blades 42 deliver the catalyst particles in the storage tank 21 to the opening 22, and the scraper impeller 19 rotates in the opposite direction. Under the action of the scraper impeller 19, the catalyst particles enter the middle of the screen 17, and the catalyst particles can be quickly replaced without disassembling the machine. The replacement greatly improves the convenience of replacing catalyst particles and shortens the replacement operation time of catalyst particles; as the granular catalyst enters the storage tank 21, the weight of the support plate 25 gradually increases, the spring is compressed, and the support 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, so as to prevent the accumulated granular catalyst from interfering with the discharge smoothness of the second screw conveyor 20; similarly, when loading the granular catalyst in the storage tank 21, as the granular catalyst at the support plate 25 decreases, the support plate 25 gradually moves upward to ensure that the second screw conveyor 20 can smoothly load the granular catalyst in the storage tank 21, effectively reducing the residual granular catalyst in the storage tank 21.

[0057] The use 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, and the methanol and pure water solution are vaporized and heated by the vaporizer. The vaporized pressurized high-temperature mixed gas enters the neck tube 9 and contacts the catalyst particles. Under the action of the high-pressure airflow, the catalyst particles rise in the conical reaction shell 2, and the high-pressure airflow acts on the axial flow impeller 5 to drive the axial flow impeller 5 to rotate, and the gas in the conical reaction shell 2 is stirred during the rotation of the axial flow impeller 5; the screen cover 8 blocks the catalyst particles from moving to the upper part of the conical reaction shell 2, and the centrifugal force generated during the rotation of the screen cover 8 driven by the axial flow impeller 5 is greater than the catalyst. Due to the friction between the catalyst particles and the screen cover 8, the catalyst particles are thrown to the concave aggregate ring portion 7 and then enter the first screw conveyor 3. The axial flow impeller 5 drives the bevel gear 6 to rotate synchronously during the rotation. After being driven 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-conveys the catalyst particles to the axial neck tube 9. The catalyst particles circulate up and down and inside and outside in the conical reaction shell 2, realizing the dynamic contact between the catalyst shell 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, and the alkali liquid in the inner cylinder 31 absorbs the carbon dioxide gas. The hydrogen after preliminary purification is introduced into the subsequent pressure swing adsorber through the second exhaust pipe 34 for further purification.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, 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; A concave material collecting ring (7) is provided on the top of the concave material collecting ring (2), a screen cover (8) which fits in the interior of the concave material collecting ring (7) is installed on the pneumatic drive component, the small-aperture end of the conical reaction shell (2) faces downward and is installed with a necking 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 collecting ring (7), and the discharge ends of the first screw conveyors (3) extend into the necking tube (9).

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 invention also comprises a material changer for replacing the catalyst, the material changer comprising 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 inside of the neck tube (9) and 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), a plurality of tooth grooves (24) are provided on the driving ring (23) and are matched 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).

5. The miniaturized methanol-to-hydrogen device according to claim 4, characterized in that: 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.

6. 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.

7. 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.

8. The miniaturized methanol-to-hydrogen device according to claim 7, 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).

9. The miniaturized methanol-to-hydrogen device according to claim 7, 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.

10. 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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