Green hydrogen production and liquefaction process and apparatus

Abstract

The present application relates to green hydrogen production technology field, especially a kind of green hydrogen production and liquefaction process and device, including gasifier body;And, sand feeding assembly, including being provided in the drive shaft of gasifier body interior, cam groove being opened in the end face of drive shaft, mobile shaft being arranged on the outer wall of drive shaft and sand storage tray being arranged on the lower end surface of mobile shaft;And, adjusting assembly, including being provided in the sealing block of sand storage tray, first discharge slot being opened in the lower end surface of sand storage tray and second discharge slot and trigger shaft being arranged on the lower end surface of sealing block;And, open-close component, including being provided in the first baffle and second baffle of gasifier body interior, sand is sent into gasifier body by sand feeding assembly, increase the heat transfer area with biomass, improve heat transfer effect, simultaneously provide driving force for adjusting assembly and open-close component, realize sand to be sent when sand storage tray drops quickly, slowly sand is sent when rising, improve production efficiency and the continuous operation ability of system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of green hydrogen production, in particular to a green hydrogen production and liquefaction process method and device. BACKGROUND

[0002] Hydrogen energy has played an increasingly important role in the energy structure of countries around the world due to its advantages of being storable, renewable, completely zero-carbon, and high energy density. In the context of the double carbon background and the accelerating development of clean energy, green methanol and green ammonia, as production and large-scale application, are the technical path for realizing renewable energy systems in the new stage of energy transformation, and the demand for green hydrogen will gradually increase. Sustainable clean energy needs to be supported by green hydrogen production technology.

[0003] Liquid hydrogen has significant advantages in hydrogen energy storage due to its high purity, large energy density per unit mass and volume. Compared to solid metal hydrogen storage and organic liquid hydrogen storage, the weight of a liquid hydrogen storage tank is much lower than that of various high-pressure hydrogen storage devices under the same effective loading volume. This characteristic makes liquid hydrogen have higher transportation efficiency and better economy in long-distance transportation scenarios, and therefore it is considered an important development direction for realizing large-scale and high-quality hydrogen energy applications. SUMMARY

[0004] In view of the above or existing problems in the prior art, the present application is proposed.

[0005] Therefore, the purpose of the present application is to provide a green hydrogen production and liquefaction process method and device.

[0006] To solve the above technical problems, the present application provides the following technical solutions.

[0007] As a preferred scheme of the green hydrogen production and liquefaction process method of the present application, wherein: including a biomass gasifier and an electrolytic water hydrogen production unit;

[0008] The outer side of the biomass gasifier is communicated with a PSA unit, and the outer side of the electrolytic water hydrogen production unit is installed with a purification and drying unit;

[0009] The outer side of the PSA unit and the purification and drying unit is provided with a hydrogen purification unit, the hydrogen purification unit includes a liquid nitrogen tank, a pre-cooler, a low-temperature adsorber and a heat exchanger, and the outlet of the hydrogen purification unit is communicated with a hydrogen liquefaction unit;

[0010] The hydrogen liquefaction unit includes a liquefaction cold box, and the outlet of the hydrogen liquefaction unit is communicated with a liquid hydrogen storage tank unit, and the liquid hydrogen storage tank unit includes a liquid hydrogen storage tank.

[0011] As a preferred scheme of the green hydrogen production and liquefaction process method of the present application, wherein: including the following steps;

[0012] S1. Adding sand as a heat transfer medium in the biomass gasifier, so that the biomass is in full contact with high-temperature flue gas and sand for heat exchange pyrolysis, and the generated synthesis gas is discharged from the top of the furnace to obtain synthesis gas with a hydrogen volume fraction of 40-60%;

[0013] S2. The synthesis gas obtained from the gasifier is sent to the hydrogen purification unit after the hydrogen purity is increased to 99.9-99.999% by the PSA unit;

[0014] S3. The hydrogen obtained by electrolysis of water in the electrolytic water hydrogen production unit using renewable energy such as wind and solar power is dehydrated by the purification and drying unit to obtain hydrogen with a purity of 99.9-99.999%, which is also sent to the hydrogen purification unit;

[0015] S4. After the high-purity hydrogen obtained is sent to the hydrogen purification unit, it is first cooled by a pre-cooler, then cooled to 80K by a heat exchanger soaked in liquid nitrogen, and then enters a low-temperature adsorber to remove a small amount of oxygen, methane and other impurities in the hydrogen, and finally the cold energy is recovered by the pre-cooler to warm up to room temperature and sent to the hydrogen liquefaction cold box;

[0016] S5. The purified hydrogen enters the liquefaction cold box, is cooled by a liquid nitrogen pre-cooled heat exchanger, and then is cooled to a liquid state by a second, third and fourth heat exchanger, and is sent to a liquid hydrogen storage tank through a J-T valve.

[0017] S6. The cold energy required for hydrogen liquefaction is provided by a helium refrigeration cycle. High-pressure helium gas discharged from a helium screw compressor is converted into low-temperature and low-pressure helium gas through a series of operations, and the cold energy is recovered after passing through the last-stage to the first-stage heat exchanger in turn in countercurrent, and then the cold box is discharged and returned to the suction end of the compressor to complete the refrigeration cycle.

[0018] The green hydrogen production and liquefaction process method has the advantages that the biomass gasifier uses oxygen-enriched air as a gasifying agent, and sand is added as a heat transfer medium to make the biomass pyrolysis more complete, and the hydrogen purification unit and the hydrogen liquefaction unit both reuse energy, improving energy use efficiency and reducing system energy consumption.

[0019] However, there is a problem that sand loss is not convenient to supplement in time during actual use.

[0020] To solve the above technical problems, the present application also provides the following technical solutions: a green hydrogen production device, comprising a green hydrogen production and liquefaction process method;

[0021] and a gasifier body;

[0022] and a sand feeding assembly comprising a drive shaft arranged inside the gasifier body, a cam groove opened at the end surface of the drive shaft, a moving shaft arranged on the outer wall of the drive shaft, and a sand storage tray arranged at the lower end surface of the moving shaft.

[0023] And the adjusting assembly comprises a blocking block arranged in the sand storage tray, a first discharging slot and a second discharging slot arranged in the lower end face of the sand storage tray, and a trigger shaft arranged in the lower end face of the blocking block.

[0024] And the opening and closing assembly comprises a first baffle and a second baffle arranged in the gasification furnace body.

[0025] The driving shaft is rotated to realize the lifting action of the sand storage tray, so as to cooperate with the adjusting assembly, trigger the blocking block to rise through the second discharging slot to realize the rapid discharging and filling of sand, and realize the continuous and slow filling of sand through the first discharging slot after rising, and realize the self-adaptive opening and closing of the gasification furnace body passage by driving the first baffle and the second baffle while the gasification furnace body is moving.

[0026] As a preferred scheme of the green hydrogen production device, the sand feeding assembly further comprises a motor arranged in the inner side of the gasification furnace body and a positioning block integrally formed on the end face of the moving shaft, and the output end of the motor is arranged on the upper end face of the driving shaft.

[0027] As a preferred scheme of the green hydrogen production device, the inner wall of the gasification furnace body is provided with a first connecting rod, the distal end of the first connecting rod is provided with a limiting frame matched with the positioning block, the end face of the moving shaft is provided with a guide block, and the guide block can slide along the cam groove.

[0028] As a preferred scheme of the device, the adjusting assembly further comprises a fixed disc arranged in the gasification furnace body and a second connecting rod arranged on the end face of the fixed disc and distributed in a ring shape, the distal end of the second connecting rod is arranged on the inner wall of the gasification furnace body, the upper end face of the blocking block is provided with a spring, and the distal end of the spring is arranged on the inner wall of the sand storage tray.

[0029] As a preferred scheme of the green hydrogen production device, the outer wall of the sand storage tray is provided with a through groove, the trigger shaft can move along the through groove, the projection of the trigger shaft and the fixed disc in the vertical direction is the same axis, the outer wall of the blocking block is provided with a flow groove distributed in a ring shape, and the flow groove and the first discharging slot partially coincide in the vertical direction.

[0030] As a preferred scheme of the green hydrogen production device, the lower end face of the first baffle and the second baffle is provided with a mounting groove, the end face of the moving shaft is symmetrically provided with a first transmission plate, one end of the first transmission plate is provided with a second transmission plate, and the distal end of the second transmission plate is arranged on the inner wall of the gasification furnace body.

[0031] As a preferred scheme of the green hydrogen production device, one end of the second transmission plate is provided with a transmission disc, the end face of the transmission disc is provided with a first connecting plate, and the tail end of the first connecting plate is arranged on the inner wall of the mounting groove.

[0032] As a preferred scheme of the green hydrogen production device, the inner wall of the mounting groove is further provided with a second connecting plate, the tail end of the second connecting plate is arranged on the inner wall of the gasification furnace body, and the two sides of the transmission disc are engaged and connected.

[0033] The green hydrogen production device has the following beneficial effects: the sand feeding assembly is used to feed sand into the gasification furnace body, the heat transfer area with the biomass is increased, the heat transfer effect is improved, and driving force is provided for the adjusting assembly and the opening and closing assembly, so that sand is quickly fed when the sand storage tray is lowered and sand is slowly fed when the sand storage tray is raised, and the production efficiency and the continuous operation capacity of the system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0035] Figure 1 The structure schematic diagram of the green hydrogen production and liquefaction process method of the present application.

[0036] Figure 2 The purification device process flow schematic diagram of the green hydrogen production and liquefaction process method of the present application.

[0037] Figure 3 The liquefaction device process flow schematic diagram of the green hydrogen production and liquefaction process method of the present application.

[0038] Figure 4 The overall structure schematic diagram of the green hydrogen production device of the present application.

[0039] Figure 5 The internal structure schematic diagram of the green hydrogen production device of the present application.

[0040] Figure 6 The sand feeding assembly structure schematic diagram of the green hydrogen production device of the present application.

[0041] Figure 7 The sand feeding assembly split structure schematic diagram of the green hydrogen production device of the present application.

[0042] Figure 8Structure diagram of the adjusting assembly of the green hydrogen production device.

[0043] Figure 9 Structure diagram of the opening and closing assembly of the green hydrogen production device.

[0044] Figure 10 Structure diagram of the opening and closing assembly of the green hydrogen production device.

[0045] In the figure, 1, gasifier body; 2, sand feeding assembly; 21, motor; 22, drive shaft; 23, cam groove; 24, moving shaft; 25, positioning block; 26, limiting frame; 27, first connecting rod; 28, sand storage tray; 29, guide block; 3, adjusting assembly; 31, blocking block; 32, spring; 33, first discharging groove; 34, flow groove; 35, second discharging groove; 36, through groove; 37, trigger shaft; 38, fixed disc; 39, second connecting rod; 4, opening and closing assembly; 41, first baffle; 42, second baffle; 43, mounting groove; 44, first transmission plate; 45, second transmission plate; 46, first connecting plate; 47, second connecting plate; 48, transmission disc. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0047] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the concept of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0048] Secondly, "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0049] Embodiment 1

[0050] Reference Figure 1 , Figure 2 and Figure 3 , the first embodiment of the present application provides a green hydrogen production and liquefaction process method, which can convert biomass into liquid hydrogen and store it.

[0051] Specifically, a green hydrogen production and liquefaction process method includes a biomass gasifier and a water electrolysis hydrogen production unit.

[0052] The outside of the bio-gasifier is communicated with a PSA unit, and the outside of the electrolytic water hydrogen production unit is installed with a purification and drying unit;

[0053] The outside of the PSA unit and the purification and drying unit is provided with a hydrogen purification unit, which comprises a liquid nitrogen tank, a pre-cooler, a low-temperature adsorber and a heat exchanger, and the outlet of the hydrogen purification unit is communicated with a hydrogen liquefaction unit;

[0054] The hydrogen liquefaction unit comprises a liquefaction cold box, and the outlet of the hydrogen liquefaction unit is communicated with a liquid hydrogen storage tank unit, which comprises a liquid hydrogen storage tank.

[0055] A green hydrogen production and liquefaction process method, comprising the following steps:

[0056] S1. Adding sand as a heat transfer medium in a biomass gasifier to allow the biomass to fully contact and exchange heat with high-temperature flue gas and sand for pyrolysis, and the generated synthesis gas is discharged from the top of the furnace to obtain synthesis gas with a hydrogen volume fraction of 40% to 60%; wherein the biomass gasifier uses oxygen-enriched air as a gasifying agent in combination with sand to improve the reaction efficiency, and the biomass gasifier can adopt one of an external circulating fluidized bed, a riser type fluidized bed and a double fluidized bed.

[0057] S2. The synthesis gas obtained from the gasifier is sent to a hydrogen purification unit after the hydrogen purity is increased to 99.9% to 99.999% by a PSA unit; wherein the PSA device analysis gas can be used as a gasifier fuel to realize the recycling of energy.

[0058] S3. The hydrogen produced by the electrolytic water hydrogen production unit using renewable energy such as wind and solar power is dehydrated by a purification and drying unit to obtain hydrogen with a purity of 99.9% to 99.999%, which is also sent to the hydrogen purification unit; wherein the electrolytic water device can adopt one of an alkaline electrolytic cell, a PEM electrolytic cell and a solid oxide electrolytic water technology.

[0059] S4. The high-purity hydrogen produced is first cooled by a pre-cooler and then cooled to 80K by a heat exchanger soaked in liquid nitrogen before entering a low-temperature adsorber to remove a small amount of oxygen, methane and other impurities in the hydrogen, and finally the cold energy is recovered by the pre-cooler, and the temperature is raised to room temperature before being sent to a hydrogen liquefaction cold box; wherein the hydrogen purification device adopts a switching type double-tower circulation, and the adsorption tower adopts a low-temperature vacuum structure, and the liquid nitrogen provides cold energy after vaporization, which is also recovered by the pre-cooler and discharged;

[0060] When the adsorption tower is regenerated, the liquid nitrogen in the container is first discharged into the adsorption tower to reduce the consumption of liquid nitrogen, and then normal temperature nitrogen is introduced to warm up the adsorber. The nitrogen is pumped out by a vacuum pump and discharged into the atmosphere. When the temperature of the adsorber reaches normal temperature, it is considered that the regeneration is completed, the nitrogen is stopped, the pipeline is pumped to vacuum, and then the hydrogen is switched to standby.

[0061] S5. The purified hydrogen enters the liquefied cold box, is cooled by the heat exchanger pre-cooled by liquid nitrogen, and then is cooled to liquid by the second, third and fourth heat exchangers, and is sent to the liquid hydrogen storage tank through the J-T valve. Among them, the heat exchanger is filled with primary and secondary hydrogen conversion catalyst for continuous primary and secondary hydrogen conversion, and the content of secondary hydrogen in the liquid hydrogen from the last heat exchanger is greater than 95%;

[0062] The liquid hydrogen cold box adopts a vacuum insulated square cold box form, the cold box is a pry-mounted structure, the internal equipment is supported on the cold box bottom panel through a support, and a glass fiber reinforced plastic pad is used between the equipment and the support to reduce the cold conduction between the low temperature equipment and the support. The upper cover plate and the side plate of the cold box can be disassembled, facilitating the construction and later maintenance and repair of the cold box. The cold box is pumped to vacuum by a vacuum pump, a sealing groove is arranged on the end face sealing plate, and the cold box is kept in vacuum state by rubber ring sealing.

[0063] S6. The cold energy required for hydrogen liquefaction is provided by a helium refrigeration cycle. High-pressure helium gas discharged from a helium screw compressor is converted into low-temperature and low-pressure helium gas through a series of operations, and is sequentially countercurrently passed through the last-stage to the first-stage heat exchanger to recover cold energy and then discharged from the cold box to return to the suction end of the compressor to complete the refrigeration cycle. Among them, the high-pressure helium gas is cooled by a water cooler, enters an ORS unit to remove trace oil gas contained in the helium, then passes through a liquid nitrogen pre-cooling heat exchanger, is cooled to 40-55K by a second heat exchanger, and part of the helium is passed through a turbine expander turbine for adiabatic expansion to become low-temperature and low-pressure helium gas to provide cold energy for the first and second heat exchangers. Another part of the helium is further cooled to 25-35K by a third heat exchanger, and then is passed through a turbine expander turbine for adiabatic expansion to become low-temperature and low-pressure helium gas.

[0064] In summary, the hydrogen obtained by purifying the synthesis gas from the biomass gasifier through the PSA unit and the hydrogen obtained by electrolysis of water through the electrolytic water hydrogen production unit using renewable energy such as wind and solar power is mixed with the above-mentioned hydrogen after dehydration through the purification and drying unit, and then is sent to the hydrogen purification unit, from which the trace oxygen, methane and other impurities are removed, and then is liquefied through the hydrogen liquefaction unit and is stored in the liquid hydrogen storage tank. Not only can the biomass be converted into high-purity liquid hydrogen, but also the energy can be recycled and used in multiple stages to reduce the energy consumption of the system.

[0065] Example 2

[0066] Reference Figures 4-8For the second embodiment of the present application, unlike the previous embodiment, the embodiment provides a sand feeding structure of a green hydrogen production device, which can realize rapid sand feeding during descending and continuous slow sand feeding during ascending to supplement the sand consumed in the reaction in the gasifier body 1.

[0067] Specifically, it comprises a gasifier body 1; wherein the inner top of the gasifier body 1 is provided with a sand feeding assembly 2, and the upper and lower ends of the outer wall are respectively provided with a gas outlet for the outflow of synthesis gas and a feed inlet for the entry of biomass, and meanwhile, each component part in the gasifier body 1 needs to be made of high-temperature-resistant material to ensure the stable operation of each component.

[0068] Further, the sand feeding assembly 2 comprises a driving shaft 22 arranged inside the gasifier body 1, a cam groove 23 opened at the end face of the driving shaft 22, a moving shaft 24 slidably connected to the outer wall of the driving shaft 22, and a sand storage tray 28 fixedly connected to the lower end face of the moving shaft 24; wherein the driving shaft 22 is arranged at the inner top of the gasifier body 1, the cam groove 23 is composed of two symmetrical sliding grooves distributed around the outer wall of the driving shaft 22, and the two sliding grooves are connected end to end, the moving shaft 24 can slide along the outer wall of the driving shaft 22, and the sand storage tray 28 needs to have a certain space, and the moving shaft 24 rises and falls for one cycle, and the biomass reaction is completed within the cycle.

[0069] Further, the adjusting assembly 3 comprises a blocking block 31 arranged inside the sand storage tray 28, a first discharge slot 33 and a second discharge slot 35 opened at the lower end face of the sand storage tray 28, and a trigger shaft 37 fixedly connected to the lower end face of the blocking block 31; wherein the blocking block 31 is a straight flat-top cone structure, a certain space is opened at the inner top of the sand storage tray 28 for the upward and downward movement of the blocking block 31, the first discharge slot 33 has a smaller aperture, the second discharge slot 35 has an arc-shaped slot structure, and therefore the discharge amount of the second discharge slot 35 is much larger than that of the first discharge slot 33, and the trigger shaft 37 is connected with the blocking block 31 and extends to the bottom of the sand storage tray 28.

[0070] Further, the opening and closing assembly 4 comprises a first baffle 41 and a second baffle 42 slidably connected inside the gasifier body 1; wherein the height of the second baffle 42 is slightly lower than that of the first baffle 41, and the second baffle 42 can continue to move a certain displacement along the inside of the first baffle 41, and meanwhile, when the first baffle 41 and the second baffle 42 are completely fitted, the space between them is adapted to the outer wall of the driving shaft 22, and the movement of the first baffle 41 and the second baffle 42 realizes the opening and closing of the channel of the gasifier body 1, thereby facilitating personnel to supplement sand in the sand storage tray 28 and ensuring the reaction effect of the gasifier.

[0071] The rotation of the driving shaft 22 realizes the lifting action of the sand storage tray 28, so as to cooperate with the adjusting assembly 3, and after reaching the predetermined position, the blocking block 31 is triggered to rise to realize the rapid discharge of sand through the second discharge slot 35, and after rising, the first discharge slot 33 is realized to realize the continuous slow filling of sand, and the self-adaptive opening and closing of the gasification furnace body 1 passage is realized according to the driving of the first baffle 41 and the second baffle 42 while the gasification furnace body 1 moves.

[0072] Further, the sand feeding assembly 2 further comprises a motor 21 fixedly installed inside the gasification furnace body 1 and a positioning block 25 integrally formed on the end face of the moving shaft 24, and the output end of the motor 21 is fixedly connected to the upper end face of the driving shaft 22. The motor 21 provides power input for the sand feeding assembly 2, and the positioning block 25 is designed on both sides of the moving shaft 24.

[0073] Preferably, the inner wall of the gasification furnace body 1 is fixedly connected with a first connecting rod 27, the distal end of the first connecting rod 27 is fixedly connected with a limiting frame 26 matched with the positioning block 25, and the end face of the moving shaft 24 is fixedly connected with a guide block 29 which can slide along the cam groove 23. The gasification furnace body 1 limits the positioning block 25 through the first connecting rod 27 and the limiting frame 26, so that the moving shaft 24 always moves up and down in the same direction through the wrapping of the positioning block 25 by the limiting frames 26 on both sides, and the distal end of the guide block 29 needs to extend to the inside of the moving shaft 24 and contact the cam groove 23. It should be noted that the diameter of the cam groove 23 is greater than that of the guide block 29.

[0074] It should be noted that the adjusting assembly 3 further comprises a fixed disc 38 arranged inside the gasification furnace body 1 and a second connecting rod 39 fixedly connected to the end face of the fixed disc 38 and arranged in a ring shape, the distal end of the second connecting rod 39 is fixedly connected to the inner wall of the gasification furnace body 1, the upper end face of the blocking block 31 is fixedly installed with a spring 32, and the distal end of the spring 32 is fixedly connected to the inner wall of the sand storage tray 28. When the guide block 29 moves to the bottom of the cam groove 23, the trigger shaft 37 contacts the fixed disc 38, and the fixed disc 38 is connected with the second connecting rod 39, so as to realize the fixation of the position of the fixed disc 38.

[0075] Furthermore, the outer wall of the sand storage pan 28 is provided with a through groove 36, along which the trigger shaft 37 can move. The vertical projection of the trigger shaft 37 and the fixed plate 38 is on the same axis. The outer wall of the sealing block 31 is provided with a ring-shaped flow groove 34, which partially overlaps with the vertical projection of the first discharge chute 33. Since the trigger shaft 37 and the fixed plate 38 are located on the same vertical projection plane, the contact between the trigger shaft 37 and the fixed plate 38 can compress the spring 32. When the sealing block 31 is located on the inner bottom wall of the sand storage pan 28, the flow groove 34 on its outer wall partially overlaps with the first discharge chute 33, allowing the spring 32 to be in a stretched state, and the sand in the sand storage pan 28 can slowly flow out from the flow groove 34.

[0076] The rest of the structure is the same as in Example 1.

[0077] When in use, the motor 21 is started, and the motor 21 drives the drive shaft 22 to rotate. When the drive shaft 22 rotates clockwise, the upper end face of the cam groove 23 on the end face of the drive shaft 22 drives the guide block 29 to move. Due to the limitation of the positioning blocks 25 on both sides of the moving shaft 24 by the limiting frame 26 and the first connecting rod 27, they cooperate with the drive shaft 22, so that the moving shaft 24 slides downward in the vertical direction. During this process, the sand will flow out from the first feeding groove 33 through the flow groove 34. When the moving shaft 24 moves to almost the bottom, the trigger shaft 37 contacts the fixed plate 38. At this time, the moving shaft 24 continues to move downward, so that the trigger shaft 37 drives the sealing block 31 to squeeze the spring 32. The compression of the spring 32 realizes the upward movement of the sealing block 31, thereby opening the space at the bottom of the sand storage tray 28. The sand in the sand storage tray 28 flows out from the first feeding groove 33 and the second feeding groove 35, realizing the rapid filling of sand inside the gasifier body 1, so as to meet the reaction conditions and improve the working efficiency.

[0078] As the motor 21 continues to rotate, the guide block 29 is located at the bottom of the cam groove 23. The lower end face of the cam groove 23 will drive the guide block 29 to move upward, thereby triggering the shaft 37 to gradually disengage from the end face of the fixed plate 38, relieving the pressure on the spring 32. The spring 32 uses its own elasticity to reset the sealing block 31 and seal the second feeding trough 35. At this time, the sand can only flow out slowly from the first feeding trough 33, realizing the slow flow of sand when the gasifier is working, and replenishing the sand lost during the reaction process.

[0079] In summary, the rotation of the drive shaft 22 driven by the motor 21, combined with the guide block 29 and the cam groove 23 connected to the front and rear, enables the reciprocating motion of the moving shaft 24 in the vertical direction, providing power for the sand discharge from the sand storage pan 28. In conjunction with the trigger structure and the feeding troughs of different diameters, the sand feeding component 2 is rapidly fed when it descends and continuously and slowly fed when it rises, ensuring the effectiveness of the reaction inside the gasifier.

[0080] Embodiment 3

[0081] With reference to Figures 3-10 For the third embodiment of the present application, unlike the previous embodiment, the embodiment provides a structure for synchronously opening and closing the passage of the gasification furnace following the sand feeding assembly 2, which can realize the opening and closing of the passage of the gasification furnace body 1 according to the moving position and direction of the sand feeding assembly 2.

[0082] Specifically, the lower end surface of the first baffle plate 41 and the second baffle plate 42 are both provided with a mounting groove 43, and the end surface of the moving shaft 24 is symmetrically connected with a first transmission plate 44, one end of the first transmission plate 44 is rotatably connected with a second transmission plate 45, and the end of the second transmission plate 45 is arranged on the inner wall of the gasification furnace body 1. Among them, the mounting groove 43 provides a connection space for the first connecting plate 46 and the second connecting plate 47, improves the space utilization efficiency, the first transmission plate 44 transmits the movement of the moving shaft 24 as a driving force, and the bottom of the first baffle plate 41 and the second baffle plate 42 is provided with a symmetrical structure.

[0083] Further, one end of the second transmission plate 45 is fixedly connected with a transmission disc 48, the end surface of the transmission disc 48 is fixedly connected with the first connecting plate 46, and the end of the first connecting plate 46 is fixedly connected to the inner wall of the mounting groove 43. Among them, the second transmission plate 45 converts the driving force of the moving shaft 24 into the rotating force of the transmission disc 48, the transmission disc 48 is a local gear, and the two transmission discs 48 are used to realize the opposite movement and reverse movement of the first baffle plate 41 and the second baffle plate 42.

[0084] Preferably, the inner wall of the mounting groove 43 is also fixedly connected with the second connecting plate 47, the end of the second connecting plate 47 is rotatably connected to the inner wall of the gasification furnace body 1, and the two transmission discs 48 are meshingly connected. Among them, the two ends of the first connecting plate 46 and the second connecting plate 47 are respectively connected with the baffle plate and the inner wall of the gasification furnace body 1, and one end of them is rotatably connected to the inner wall of the gasification furnace, so as to limit the position of the first baffle plate 41 and the second baffle plate 42, and make them always move along the horizontal direction.

[0085] The remaining structures are the same as those of Embodiment 2.

[0086] In use, when the moving shaft 24 is at the top of the cam groove 23, the first baffle 41 and the second baffle 42 are in a separated state, when the moving shaft 24 starts to descend, the moving shaft 24 drives the first transmission plate 44 to move, the bottom of the first transmission plate 44 starts to rotate clockwise, thereby driving the second transmission plate 45 to move in a corresponding track, the bottom of the second transmission plate 45 is rotationally connected to the inner wall of the gasifier body 1, and thus is limited by the side, so that the second transmission plate 45 rotates counterclockwise, thereby driving the transmission disc 48 and the first connecting plate 46 to rotate counterclockwise synchronously, so that the transmission discs 48 on both sides are engaged and connected, the first baffle 41 and the second baffle 42 are pulled by the top of the first connecting plate 46 and thus move towards each other, and the second connecting plate 47 further ensures the stability of the movement, when the moving shaft 24 moves to the bottom, the second baffle 42 slides to the inner side of the first baffle 41, and the passage of the gasifier body 1 is closed, at this time, the sand is quickly filled, and the biomass is sent in for reaction.

[0087] Similarly, when ascending, the above actions are reversed, the moving height of the moving shaft 24 is controlled by controlling the rotating speed and working state of the motor 21, and thus the opening state of the opening and closing assembly 4 can be controlled, the moving shaft 24 can slowly ascend to the end of the reaction, and since there is a certain excess range between the first baffle 41 and the second baffle 42, the passage will not be opened within a certain moving stroke of the moving shaft 24, and the reaction will not be affected, until the excess range ends, the first baffle 41 and the second baffle 42 will move reversely, when the moving shaft 24 moves to the top of the cam groove 23, at this time, the first baffle 41 and the second baffle 42 are completely opened, which is convenient for personnel to supplement the sand in the sand storage disc 28, and provides enough heat transfer medium for the next reaction.

[0088] In summary, the movement of the sand feeding assembly 2 provides enough driving force for the opening and closing assembly 4, and the moving direction of the first baffle 41 and the second baffle 42 is matched with the ascending and descending direction of the moving shaft 24, which is convenient for personnel to operate and improves the rapid progress of the reaction.

[0089] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A process for green hydrogen production and liquefaction, characterized in that: The device used in the green hydrogen production and liquefaction process comprises a biomass gasification furnace and an electrolytic water hydrogen production unit; The outer side of the biomass gasification furnace is connected with a PSA unit, and the outer side of the electrolytic water hydrogen production unit is installed with a purification and drying unit; The outer side of the PSA unit and the purification and drying unit is provided with a hydrogen purification unit, which comprises a liquid nitrogen tank, a pre-cooler, a low-temperature adsorber and a heat exchanger, and the outlet of the hydrogen purification unit is connected with a hydrogen liquefaction unit; The hydrogen liquefaction unit comprises a liquefaction cold box, and the outlet of the hydrogen liquefaction unit is connected with a liquid hydrogen storage tank unit, which comprises a liquid hydrogen storage tank; The specific method comprises the following steps: S1. Add sand as a heat transfer medium in the biomass gasification furnace to allow the biomass to fully contact and exchange heat with high-temperature flue gas and sand for pyrolysis, and the generated synthesis gas is discharged from the top of the furnace to obtain synthesis gas with a hydrogen volume fraction of 40-60%; S2. The synthesis gas obtained from the gasification furnace is sent to the hydrogen purification unit after the hydrogen purity is increased to 99.9-99.999% by the PSA unit; S3. The hydrogen produced by the electrolytic water hydrogen production unit using wind and solar renewable energy is dehydrated by the purification and drying unit to obtain hydrogen with a purity of 99.9-99.999%, which is also sent to the hydrogen purification unit; S4. The high-purity hydrogen produced is first cooled by the pre-cooler and then cooled to 80K by the heat exchanger soaked in liquid nitrogen before entering the low-temperature adsorber to remove a small amount of oxygen and methane impurities in the hydrogen, and finally the cold energy is recovered by the pre-cooler to warm up to room temperature before being sent to the hydrogen liquefaction cold box; S5. The purified hydrogen enters the liquefaction cold box, is cooled by the liquid nitrogen pre-cooled heat exchanger, and then is cooled to liquid by the second, third and fourth heat exchangers, and is sent to the liquid hydrogen storage tank through the J-T valve; S6. The cold energy required for hydrogen liquefaction is provided by a helium refrigeration cycle. High-pressure helium gas discharged by a helium screw compressor is converted into low-temperature and low-pressure helium gas through a series of operations, and the low-temperature and low-pressure helium gas successively flows backward through the last-stage to the first-stage heat exchanger to recover cold energy before being discharged from the cold box and returning to the suction end of the compressor to complete the refrigeration cycle.

2. A green hydrogen production apparatus, characterized by, The biomass gasification furnace and the electrolytic water hydrogen production unit in the green hydrogen production and liquefaction process of claim 1; the outer side of the biomass gasification furnace is connected with a PSA unit, and the outer side of the electrolytic water hydrogen production unit is installed with a purification and drying unit; the outer side of the PSA unit and the purification and drying unit is provided with a hydrogen purification unit, which comprises a liquid nitrogen tank, a pre-cooler, a low-temperature adsorber and a heat exchanger, and the outlet of the hydrogen purification unit is connected with a hydrogen liquefaction unit; the hydrogen liquefaction unit comprises a liquefaction cold box, and the outlet of the hydrogen liquefaction unit is connected with a liquid hydrogen storage tank unit, which comprises a liquid hydrogen storage tank; and the biomass gasification furnace comprises, a gasification furnace body (1), and The sand feeding assembly (2) comprises a driving shaft (22) arranged inside the gasification furnace body (1), a cam groove (23) opened at the end face of the driving shaft (22), a moving shaft (24) arranged on the outer wall of the driving shaft (22), and a sand storage tray (28) arranged at the lower end face of the moving shaft (24); and The adjusting assembly (3) comprises a blocking block (31) arranged inside the sand storage tray (28), a first discharging groove (33) and a second discharging groove (35) opened at the lower end face of the sand storage tray (28), and a trigger shaft (37) arranged at the lower end face of the blocking block (31); and The opening and closing assembly (4) comprises a first baffle (41) and a second baffle (42) arranged inside the gasification furnace body (1); wherein The driving shaft (22) is rotated to realize the lifting action of the sand storage tray (28), so as to cooperate with the adjusting assembly (3), trigger the blocking block (31) to rise through the second discharging groove (35) to realize the rapid discharging and filling of sand after reaching the predetermined position, and realize the continuous and slow filling of sand through the first discharging groove (33) after rising, and realize the self-adaptive opening and closing of the channel of the gasification furnace body (1) by driving the first baffle (41) and the second baffle (42) while the gasification furnace body (1) is moving.

3. The green hydrogen production plant of claim 2, wherein: The sand feeding assembly (2) further comprises a motor (21) mounted on the inner side of the gasification furnace body (1) and a positioning block (25) integrally formed at the end face of the moving shaft (24), and the output end of the motor (21) is arranged at the upper end face of the driving shaft (22).

4. The green hydrogen production plant of claim 3, wherein: The inner wall of the gasification furnace body (1) is provided with a first connecting rod (27), the distal end of the first connecting rod (27) is provided with a limiting frame (26) matched with the positioning block (25), the end face of the moving shaft (24) is provided with a guide block (29), and the guide block (29) can slide along the cam groove (23).

5. The green hydrogen production plant of claim 4, wherein: The adjusting assembly (3) further comprises a fixed disc (38) arranged inside the gasification furnace body (1) and a second connecting rod (39) arranged at the end face of the fixed disc (38) and distributed in a ring shape, the distal end of the second connecting rod (39) is arranged on the inner wall of the gasification furnace body (1), the upper end face of the blocking block (31) is provided with a spring (32), and the distal end of the spring (32) is arranged on the inner wall of the sand storage tray (28).

6. The green hydrogen production plant of claim 5, wherein: The outer wall of the sand storage tray (28) is provided with a through groove (36), the trigger shaft (37) can move along the through groove (36), the projection of the trigger shaft (37) and the fixed disc (38) in the vertical direction is the same axis, the outer wall of the blocking block (31) is provided with a flow groove (34) distributed in a ring shape, and the flow groove (34) and the first discharging groove (33) are partially coincident in the vertical direction.

7. The green hydrogen production plant of claim 6, wherein: The lower end surface of the first baffle (41) and the second baffle (42) is provided with a mounting groove (43), the end surface of the moving shaft (24) is provided with a first transmission plate (44) symmetrically, one end of the first transmission plate (44) is provided with a second transmission plate (45), and the tail end of the second transmission plate (45) is arranged on the inner wall of the gasification furnace body (1).

8. The green hydrogen production plant of claim 7, wherein: One end of the second transmission plate (45) is provided with a transmission disc (48), the end surface of the transmission disc (48) is provided with a first connecting plate (46), and the tail end of the first connecting plate (46) is arranged on the inner wall of the mounting groove (43).

9. The green hydrogen production plant of claim 8, wherein: The inner wall of the mounting groove (43) is further provided with a second connecting plate (47), the tail end of the second connecting plate (47) is arranged on the inner wall of the gasification furnace body (1), and the transmission discs (48) on both sides are engaged and connected.

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