Green hydrogen production system coupling biomass electrooxidation and water reduction

Abstract

The invention relates to the technical field of green hydrogen production, in particular to a green hydrogen production system coupling biomass electrooxidation and water reduction, which comprises a pretreatment unit, a photovoltaic power generation unit and an electrolytic bath, the pretreatment unit is used for dissolving a polyhydroxy compound in an alkaline aqueous solution to form an alkaline electrolyte containing the polyhydroxy compound; the photovoltaic power generation unit is used for providing electric energy for the electrolysis process in the electrolytic cell, the electrolytic cell comprises a shell, an ion exchange membrane, an anode plate and a cathode plate, the ion exchange membrane divides the shell into an anode chamber and a cathode chamber, the anode plate is electrically connected with the positive electrode of the photovoltaic power generation unit, and the cathode plate is electrically connected with the negative electrode of the photovoltaic power generation unit. The shell is provided with a seawater inlet and a hydrogen outlet which are communicated with the cathode chamber, and the shell is provided with a compound inlet and a chemical outlet which are communicated with the anode chamber. According to the scheme, chemicals are obtained from the anodes, the safety is high, the cell voltage needed for driving the whole electrolysis process is greatly reduced, and the energy consumption of the whole electrolysis hydrogen production process is small.

Description

Technical Field

[0001] This invention relates to the field of green hydrogen production technology, specifically to a green hydrogen production system that couples biomass electro-oxidation and water reduction. Background Technology

[0002] Hydrogen energy, as an energy source, is characterized by zero pollution, zero carbon, and no secondary pollution. It is a recognized clean energy source and is hailed as the most promising secondary energy source of the 21st century, possessing highly competitive advantages. Green hydrogen refers to hydrogen produced using renewable energy sources (such as wind power, photovoltaics, and hydropower) through water electrolysis technology. Its production process is almost entirely carbon-neutral, and it is considered a core energy carrier for achieving carbon neutrality. Against the backdrop of global efforts to address climate change, the green hydrogen industry is accelerating its development. Water electrolysis hydrogen production technology has become a major development direction due to its cleanliness. However, traditional water electrolysis hydrogen production relies on freshwater resources and requires the preparation of pure water before electrolysis, limiting its large-scale application. Secondly, the oxygen obtained at the anode in traditional water electrolysis hydrogen production is of low value and is easily mixed with hydrogen permeated from the cathode to form a highly explosive gas, resulting in high costs for gas separation and monitoring. Furthermore, in traditional water electrolysis hydrogen production, the oxygen evolution reaction at the anode requires a high cell potential, leading to high energy consumption for driving the entire electrolysis hydrogen production process. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a green hydrogen production system that couples biomass electro-oxidation and water reduction, so as to solve the problems of high energy consumption, low product value and low safety in the existing electrolytic hydrogen production technology.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: a green hydrogen production system coupling biomass electro-oxidation and water reduction, comprising:

[0005] A pretreatment unit is used to dissolve polyhydroxy compounds in an alkaline aqueous solution to form an alkaline electrolyte containing polyhydroxy compounds;

[0006] A photovoltaic power generation unit for providing electrical energy to electrolyze hydrogen includes a floating platform set at sea and multiple photovoltaic modules set on the floating platform. The floating platform is fixedly connected to the seabed via a mooring assembly. The photovoltaic modules include a support frame fixedly connected to the floating platform, photovoltaic panels set on the support frame, a controller, and an inverter.

[0007] An electrolytic cell includes a shell, an ion exchange membrane located inside the shell, an anode plate, and a cathode plate. The ion exchange membrane divides the shell into an anode chamber and a cathode chamber. The anode plate is located inside the anode chamber and is electrically connected to the positive electrode of the photovoltaic power generation unit. The cathode plate is located inside the cathode chamber and is electrically connected to the negative electrode of the photovoltaic power generation unit. The shell is provided with a seawater inlet and a hydrogen outlet communicating with the cathode chamber, and a compound inlet and a chemical outlet communicating with the anode chamber.

[0008] Furthermore, the alkaline aqueous solution includes one or more aqueous solutions selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, potassium bicarbonate, potassium carbonate, sodium bicarbonate, and sodium carbonate.

[0009] Furthermore, the polyhydroxy compound includes one or more of glucose, xylitol, fructose, cellulose, xylan, galactose, sucrose, xylose, mannose, glycerol, and ethylene glycol.

[0010] Furthermore, the support frame includes two rows of opposing support rods and a mounting plate disposed on the upper end of the support rods, and the photovoltaic panel is disposed on the mounting plate.

[0011] Furthermore, the photovoltaic power generation unit also includes a cleaning mechanism for cleaning the photovoltaic panel. The cleaning mechanism includes a cleaning component and a drive assembly. The drive assembly includes a transmission rod group arranged parallel to one side of the photovoltaic panel, a power component that drives the transmission rod group to rotate, and a sprocket group that is connected to the transmission rod group. The power component drives the transmission rod group to rotate under the undulation of the floating plate. The cleaning component is disposed on the sprocket group.

[0012] Furthermore, the power component includes a pull rope, a tension spring disposed on the bottom surface of the float, and a weight located in the seawater. The upper end of the pull rope is wound around the transmission rod assembly, and the lower end of the pull rope passes downward through the float and is fixedly connected to the weight. The upper end of the tension spring is fixedly connected to the bottom surface of the float, and the lower end of the tension spring is fixedly connected to the pull rope.

[0013] Furthermore, the transmission rod assembly includes a first rotating shaft, a second rotating shaft, and a third rotating shaft arranged coaxially in sequence. The float plate is respectively fixedly connected to a first bearing seat, a second bearing seat, and a third bearing seat for mounting the first rotating shaft, the second rotating shaft, and the third rotating shaft. A coil spring is provided on the first bearing seat to force the first rotating shaft to return to its original position. The first rotating shaft is connected to the second rotating shaft via a one-way coupling. The second rotating shaft is a reciprocating lead screw, and a lead screw nut is fitted onto the reciprocating lead screw. A groove is provided on the second bearing seat in a direction parallel to the axis of the reciprocating lead screw. The lead screw nut is slidably connected to the groove, and the reciprocating lead screw is unidirectionally rotatably connected to the second bearing seat. The rotating shaft three is connected to the reciprocating lead screw via a coil spring two. A stop block is protruding on the rotating shaft three, and a drive wheel that is connected to the sprocket group is fixedly connected to the rotating shaft three. A stop bar is slidably mounted on the shaft seat two, and a tension spring two is provided on the shaft seat two to force the stop bar to slide and prevent the stop block from rotating with the rotating shaft three. The end of the stop bar away from the stop block is connected to the lead screw nut via an elastic soft rope. When the lead screw nut moves away from the stop bar and passes the middle position of the reciprocating lead screw, the lead screw nut forces the stop bar to slide away from the position that blocks the stop block through the elastic soft rope.

[0014] Furthermore, the sprocket assembly includes a fourth and a fifth rotating shaft, both parallel to the reciprocating lead screw; a drive sprocket symmetrically arranged on both sides of the mounting plate and fixedly connected to the fourth rotating shaft; a driven sprocket arranged on the fourth rotating shaft and drivenly connected to the drive sprocket; and a driven sprocket corresponding to the drive sprocket and arranged on the fifth rotating shaft. The driven sprocket and the drive sprocket are connected by a chain drive, and both ends of the cleaning component are respectively connected to one of the chains.

[0015] Furthermore, the cleaning component includes a strip-shaped cleaning plate, with both ends of the cleaning plate being fixedly connected to chains on both sides of the mounting plate, and a brush that contacts the upper surface of the photovoltaic panel is provided on the surface of the cleaning plate near the photovoltaic panel.

[0016] Furthermore, both the driving wheel and the driven wheel are meshing gears, and the driving wheel and the driven wheel are connected by a gear transmission.

[0017] In this scheme, an alkaline electrolyte containing polyhydroxy compounds is introduced into the anode chamber through a compound inlet, while filtered seawater is introduced into the cathode chamber through a seawater inlet. In the anode chamber, the polyhydroxy compounds are electro-oxidized to produce industrially valuable chemicals such as formic acid, lactic acid, adipic acid, and furan dicarboxylic acid, releasing electrons and protons. In the cathode chamber, a hydrogen evolution reaction occurs, where protons (H+) and electrons (e-) from the anode combine at the cathode to generate hydrogen gas.

[0018] In the photovoltaic power generation unit of this scheme, initially, the cleaning plate is positioned close to the reciprocating screw. At this time, the screw nut is located near the middle of the reciprocating screw, and the elastic rope is in a slack state, exerting no tension on the stop bar. Under the action of the second tension spring, the stop bar is positioned to block the stop block, and the third rotating shaft cannot rotate freely. Under the action of waves, the float rises and falls. When the float rises, the weight cannot rise synchronously with the float due to inertia, which increases the distance between the weight and the float, causing the first tension spring to be stretched. At this time, under the tension of the rope, the first rotating shaft is forced to rotate, driving the reciprocating screw to rotate synchronously in the first direction through the one-way coupling, and the first coil spring is compressed. When the float falls, the distance between the weight and the float decreases, the first tension spring contracts, and the rope is in a slack state. Under the rebound force of the first coil spring, the first rotating shaft rotates in the second direction to tighten the rope, at which time the reciprocating screw cannot rotate in the second direction. Thus, as the float rises and falls continuously under the action of waves, the reciprocating screw continuously rotates in the first direction, causing the screw nut to slide back and forth on the reciprocating screw.

[0019] As the reciprocating screw rotates continuously in the first direction, the screw nut first slides from the middle position of the reciprocating screw towards the direction closer to the shaft three, then slides back away from the shaft three and returns to the middle position of the reciprocating screw. During the first sliding process of the screw nut, the shaft three cannot rotate in the first direction due to the obstruction of the stop bar. Therefore, the coil spring two is in a state of continuous compression as the reciprocating screw rotates. At this time, the shaft three cannot rotate, so the chain cannot rotate. The cleaning plate stops moving and is located outside the photovoltaic panel, not blocking sunlight from illuminating the photovoltaic panel.

[0020] The second sliding process of the lead screw nut is as follows: the reciprocating lead screw rotates, causing the lead screw nut to slide from the middle position of the reciprocating lead screw towards the shaft, and then slide back away from the shaft to the middle position of the reciprocating lead screw. When the lead screw nut completes the first sliding process and passes the middle position of the reciprocating lead screw to begin the second sliding process, the elastic rope of the lead screw nut tightens as it slides, generating a pulling force on the stop bar, causing the stop bar to disengage from the stop block. At this time, the elastic force of the second coil spring forces the third shaft to rotate, which in turn drives the driven wheel to rotate, thereby causing the fourth shaft to drive the drive sprocket to rotate. The cleaning plate on the chain quickly passes over the surface of the photovoltaic panel to clean the surface of the photovoltaic panel.

[0021] During the second sliding process of the screw nut due to the unidirectional rotation of the reciprocating screw, the elastic cord remains under tension, exerting a pulling force on the stop bar. The tension of the second tension spring cannot position the stop bar in a position that can block the rotation of the stop block. Therefore, during the second sliding process of the screw nut due to the unidirectional rotation of the reciprocating screw, the third rotating shaft can rotate under the drive of the reciprocating screw, thereby causing the chain to rotate and the cleaning plate to move with the chain, passing under the mounting plate and returning to the initial position. When the screw nut ends its second sliding process and is in the middle position of the reciprocating screw, the elastic cord begins to relax. The second tension spring then forces the stop bar to position itself in a position that blocks the rotation of the stop block, causing the screw nut to slide in the first sliding process due to the unidirectional rotation of the reciprocating screw, which compresses and stores energy. This process is repeated so that the cleaning plate intermittently scrapes and cleans the surface of the photovoltaic panel.

[0022] Compared to traditional water electrolysis for hydrogen production, this method produces hydrogen in the cathode chamber and high-value industrial chemicals in the anode chamber during the entire electrolysis process. Compared to the oxygen produced at the anode in traditional pure water electrolysis for hydrogen production, the industrial chemicals are more valuable and safer.

[0023] This scheme replaces the traditional oxygen evolution reaction with the electro-oxidation reaction of polyhydroxy compounds at the anode. Since the thermodynamic potential of polyhydroxy compounds during electro-oxidation is usually much lower than that required for conventional pure water to undergo the oxygen evolution reaction at the anode, the cell voltage required to drive the entire electrolysis process is greatly reduced in this scheme, and thus the energy consumption of the entire electrolysis hydrogen production process is relatively small.

[0024] In this scheme, the raw materials used to prepare polyhydroxy compounds are widely available, including agricultural waste, forestry waste, food processing waste, energy crops, etc., which are renewable carbon sources. This scheme effectively utilizes waste biomass resources, reduces the environmental problems caused by incineration or landfill, and solves the problem that traditional water electrolysis relies on high-purity water and is difficult to scale up.

[0025] In this scheme, the energy required for electrolysis comes from offshore photovoltaic power generation units, which is a renewable energy source, and the hydrogen obtained is green hydrogen.

[0026] In this scheme, the photovoltaic power generation unit, which serves as the energy foundation of the entire green hydrogen production system, is located on the sea surface. The long hours of sunlight exposure and the ability to automatically clean the photovoltaic panels by utilizing the constant undulation of the waves provide a continuous and stable renewable energy source for the system's green hydrogen production. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1This is a schematic diagram of a green hydrogen production system that couples biomass electro-oxidation and water reduction according to the present invention.

[0029] Figure 2 This is a top-view structural diagram of the photovoltaic power generation unit.

[0030] Figure 3 This is a schematic diagram of the structure of the photovoltaic power generation unit from the front view.

[0031] Figure 4 This is a schematic diagram of the structure of some components of a photovoltaic power generation unit viewed from the left.

[0032] Figure 5 for Figure 3 Sectional view of AA.

[0033] Figure 6 for Figure 2 Enlarged view of section A.

[0034] Figure 7 for Figure 2 Enlarged view of section B in the middle.

[0035] Figure 8 for Figure 6 BB section view.

[0036] The meanings of the labels in the attached diagram are as follows:

[0037] Float-101; Airbag assembly-102; Cables-103;

[0038] Support rod-210; Mounting plate-211;

[0039] Photovoltaic panel-221;

[0040] Cleaning plate-231; Shaft 1-2321; Reciprocating lead screw-2322; Shaft 3-2323; Lead screw nut-2324; Stop block-2325;

[0041] Pull rope - 2331; tension spring 1 - 2332; weight - 2333;

[0042] Shaft 4-2341; Shaft 5-2342; Drive sprocket-2343; Driven sprocket-2344; Chain-2345;

[0043] Shaft seat 1-241; Coil spring 1-2411;

[0044] Shaft seat 2-242; Slide groove 2421; Stop lever 2422; Tension spring 2-2423; Slide hole 2424;

[0045] Shaft seat 3-243; Shaft seat 4-244; Shaft seat 5-245;

[0046] One-way coupling - 251; Coil spring 2 - 252; Drive pulley - 253; Elastic rope - 254; Driven pulley - 255;

[0047] 30 on the seabed;

[0048] Electrolytic cell-40; outer shell-401; ion exchange membrane-402; anode plate-403; cathode plate-404; anode chamber-405; cathode chamber-406; seawater inlet-407; hydrogen outlet-408; compound inlet-409; chemical outlet-4010. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0051] This embodiment describes a green hydrogen production system that couples biomass electro-oxidation and water reduction, such as... Figure 1 As shown, it includes a processing unit, a photovoltaic power generation unit, and an electrolytic cell 40.

[0052] The pretreatment unit is used to dissolve a polyhydroxy compound in an alkaline aqueous solution to form an alkaline electrolyte containing the polyhydroxy compound. In the pretreatment unit, the polyhydroxy compound includes one or more of glucose, xylitol, fructose, cellulose, xylan, galactose, sucrose, xylose, mannose, glycerol, and ethylene glycol, preferably glucose. The alkaline aqueous solution includes one or more of sodium hydroxide, potassium hydroxide, lithium hydroxide, potassium bicarbonate, potassium carbonate, sodium bicarbonate, and sodium carbonate, preferably potassium hydroxide. In one preparation scheme of an alkaline electrolyte containing a polyhydroxy compound, 1 g of glucose can be dissolved in 50 mL of a 55 g / L potassium hydroxide aqueous solution to obtain one part of alkaline electrolyte containing the polyhydroxy compound.

[0053] like Figure 1As shown, the electrolytic cell 40 includes a shell 401, an ion exchange membrane 402 located inside the shell 401, an anode plate 403, and a cathode plate 404. The ion exchange membrane 402 divides the shell 401 into an anode chamber 405 and a cathode chamber 406. The anode plate 403 is located inside the anode chamber 405 and is electrically connected to the positive electrode of the photovoltaic power generation unit. The cathode plate 404 is located inside the cathode chamber 406 and is electrically connected to the negative electrode of the photovoltaic power generation unit. The shell 401 is provided with a seawater inlet 407 and a hydrogen outlet 408 communicating with the cathode chamber 406. The shell 401 is provided with a compound inlet 409 and a chemical outlet 4010 communicating with the anode chamber 405.

[0054] The photovoltaic power generation unit is used to provide electrical energy for the electrolysis of hydrogen, such as Figures 2-8 As shown, the photovoltaic power generation unit includes a floating platform set at sea and multiple photovoltaic modules set on the floating platform. The floating platform is fixedly connected to the seabed via a mooring assembly. The photovoltaic module includes a support frame fixedly connected to the floating platform, a photovoltaic panel 221 set on the support frame, a controller, an inverter, and a cleaning mechanism for cleaning the photovoltaic panel 221. The cleaning mechanism includes a cleaning component and a drive assembly. The up-and-down movement of the floating platform forces the drive assembly to drive the cleaning component to move in order to clean the surface of the photovoltaic panel 221.

[0055] Combination Figures 3-5 As shown, the floating platform includes a float plate 101 and an airbag assembly 102 disposed at the bottom of the float plate 101. The airbag assembly 102 includes multiple airbags dispersedly disposed at the bottom of the float plate 101. The airbag assembly 102 is used to generate buoyancy for the float plate 101 to prevent it from sinking. The mooring assembly includes multiple cables 103 dispersedly disposed at the bottom of the float plate 101. The upper ends of the cables 103 are fixedly connected to the float plate 101, and the lower ends of the cables 103 are connected to the seabed. 30 is fixedly connected, and the cable 103 is used to prevent the float 101 from drifting excessively. The support frame includes two rows of opposing support rods 210 and a mounting plate 211 set on the upper end of the support rods 210. The support rods 210 are vertically arranged, and the lower end of the support rods 210 is fixedly connected to the float 101. The mounting plate 211 is a horizontally arranged rectangular plate, and the mounting plate 211 is fixedly connected to the upper end of the support rods 210. The photovoltaic panel 221 is installed on the mounting plate 211.

[0056] The drive assembly includes a transmission rod group arranged parallel to one side of the photovoltaic panel 221, a power component that drives the transmission rod group to rotate, and a sprocket group that is connected to the transmission rod group. The power component drives the transmission rod group to rotate under the undulation of the floating plate 101, and the cleaning component is disposed on the sprocket group.

[0057] The transmission rod assembly includes a first rotating shaft 2321, a second rotating shaft, and a third rotating shaft 2323 arranged coaxially in sequence. The float plate 101 is fixedly connected to bearings 241, 242, and 243 for mounting the first rotating shaft 2321, the second rotating shaft, and the third rotating shaft, respectively. Each bearing 241, 242, and 243 is a U-shaped bearing. Figure 7 As shown, shaft 2321 is rotatably connected to bearing 241. Bearing 241 is equipped with a coil spring 2411 to force shaft 2321 to return to its original position. One end of the coil spring 2411 is fixedly connected to bearing 241, and the other end is fixedly connected to shaft 2321. Shaft 2321 is connected to shaft 2 via a one-way coupling 251, transmitting torque unidirectionally from shaft 2321 to shaft 2. Shaft 2321 is configured as a reciprocating lead screw 2322, on which a lead screw nut 2324 is fitted. Figure 4 , Figure 6 , Figure 8 As shown, a groove 2421 is provided on the base plate of the second bearing seat 242 along a direction parallel to the axis of the reciprocating lead screw 2322. The lower end of the lead screw nut 2324 is located in the groove 2421 and is slidably connected to the groove 2421. The reciprocating lead screw 2322 is unidirectionally rotatably connected to the second bearing seat 242 through a one-way bearing. The rotating shaft 2323 is rotatably connected to the bearing 243. The rotating shaft 2323 is connected to the reciprocating lead screw 2322 via a coil spring 252. One end of the coil spring 252 is fixedly connected to the rotating shaft 2323, and the other end is fixedly connected to the reciprocating lead screw 2322. A stop block 2325 protrudes radially from the outer wall of the end of the rotating shaft 2323 closest to the reciprocating lead screw 2322. The stop block 2325 is fixedly connected to the rotating shaft 2323. A drive wheel 253, which is a gear, is coaxially fixedly connected to the rotating shaft 2323 and is connected to the sprocket assembly for transmission. Figure 6As shown, a stop bar 2422 parallel to the reciprocating lead screw 2322 is slidably disposed on the bearing seat 242. A sliding hole 2424 slidably connects to the stop bar 2422 along a direction parallel to the reciprocating lead screw 2322. One end of the stop bar 2422 is located inside the bearing seat 242, and the other end of the stop bar 2422 extends out of the bearing seat 242 through the sliding hole 2424 towards the rotating shaft 2323. A tension spring 2423 is disposed on the bearing seat 242 to force the stop bar 2422 to slide, thereby preventing the stop block 2325 from rotating with the rotating shaft 2323. A stop lever 2422 is located outside the bearing seat 242. One end of a tension spring 2423 is fixedly connected to the inner wall of the bearing seat 242, and the other end of the tension spring 2423 is fixedly connected to the stop lever 2422. The end of the stop lever 2422 away from the stop block 2325 is connected to the lead screw nut 2324 through an elastic soft rope 254. When the lead screw nut 2324 moves away from the stop lever 2422 and passes the middle position of the reciprocating lead screw 2322, the lead screw nut 2324 forces the stop lever 2422 to slide away from the position blocking the stop block 2325 through the elastic soft rope 254.

[0058] like Figure 3 , Figure 4 As shown, the power component includes a flexible pull rope 2331, a tension spring 2332 disposed on the bottom surface of the float 101, and a weight 2333 submerged in seawater. The upper end of the pull rope 2331 is wound around the rotating shaft 2321, and the lower end of the pull rope 2331 passes downward through the bottom plate of the bearing seat 241 and the float 101 and is fixedly connected to the weight 2333. The upper end of the tension spring 2332 is fixedly connected to the bottom surface of the float 101, and the lower end of the tension spring 2332 is fixedly connected to the pull rope 2331. In this scheme, the gravity of the weight 2333 mainly acts on the tension spring 2332, and the elasticity of the coil spring 2411 is mainly used to force the rotating shaft 2321 to rotate to ensure that the upper end of the pull rope 2331 is always wound around the rotating shaft 2321.

[0059] Combination Figure 2 , Figure 3 , Figure 5As shown, the sprocket assembly includes a fourth shaft 2341 and a fifth shaft 2342, both parallel to the reciprocating screw 2322; a drive sprocket 2343 symmetrically arranged on both sides of the mounting plate 211 and fixedly connected to the fourth shaft 2341; a driven sprocket 255 coaxially fixedly connected to the fourth shaft 2341; and a driven sprocket 2344 corresponding to the drive sprocket 2343 and arranged on the fifth shaft 2342. The driven sprocket 255 is a drive sprocket that is fixedly connected to the fourth shaft 2341 and coaxially connected to the fifth shaft 2341. The driven sprocket 2344 and the driving sprocket 2343 are connected by a chain 2345. A bearing seat 244 is fixedly connected to the side wall of the mounting plate 211 near the reciprocating screw 2322. The rotating shaft 2341 is rotatably mounted on the bearing seat 244. A bearing seat 245 is fixedly connected to the side wall of the mounting plate 211 away from the bearing seat 244. The rotating shaft 2342 is rotatably mounted on the bearing seat 245. The cleaning component includes a strip-shaped cleaning plate 231. Both ends of the cleaning plate 231 are fixedly connected to the chains 2345 on both sides of the mounting plate 211. A brush is provided on the surface of the cleaning plate 231 near the photovoltaic panel 221, contacting the upper surface of the photovoltaic panel 221.

[0060] In this scheme, initially, the cleaning plate is positioned close to the reciprocating screw 2322. At this time, the screw nut 2324 is located in the middle position close to the reciprocating screw 2322, and the elastic rope 254 is in a slack state, exerting no tension on the stop lever 2422. Under the action of the second tension spring 2423, the stop lever 2422 is positioned to block the stop block 2325, and the third rotating shaft 2323 cannot rotate freely. Under the action of waves, the float 101 rises and falls. When the float 101 rises, the weight 2333 cannot rise synchronously with the float 101 due to inertia, thus increasing the distance between the weight 2333 and the float 101, causing the first tension spring 2332 to be stretched. At this time, under the tension of the pull rope 2331, the first rotating shaft 2321 is forced to rotate, driving the reciprocating screw 2322 to rotate synchronously in the first direction through the one-way coupling 251. The first coil spring 2411 is compressed. When the float 101 descends, the weight 2333... As the distance between the float and the float 101 decreases, the tension spring 2332 contracts, and the rope 2331 is in a relaxed state. Under the rebound force of the coil spring 2411, the shaft 2321 rotates in the second direction to tighten the rope 2331. At this time, under the action of the one-way bearing and the one-way coupling 251, the reciprocating screw 2322 cannot rotate in the second direction. Thus, as the float 101 rises and falls continuously under the action of the waves, the reciprocating screw 2322 rotates continuously in the first direction, causing the screw nut 2324 to slide back and forth on the reciprocating screw.

[0061] As the reciprocating screw 2322 rotates continuously in the first direction, the screw nut 2324 first slides from the middle position of the reciprocating screw 2322 towards the direction close to the rotating shaft 2323, and then slides back away from the rotating shaft 2323 to the middle position of the reciprocating screw 2322. During the first sliding process of the screw nut 2324, the rotating shaft 2323 cannot rotate in the first direction due to the obstruction of the stop bar 2422. Therefore, the coil spring 252 is in a state of continuous compression as the reciprocating screw 2322 rotates. At this time, the rotating shaft 2323 cannot rotate, so the chain 2345 cannot rotate. The cleaning plate stops moving and is located outside the photovoltaic panel 221, not blocking sunlight from illuminating the photovoltaic panel 221.

[0062] The second sliding process of the lead screw nut 2324 is as follows: the reciprocating lead screw 2322 rotates, causing the lead screw nut 2324 to slide from the middle position of the reciprocating lead screw 2322 towards the shaft 2321, and then slide back away from the shaft 2321 to the middle position of the reciprocating lead screw 2322. When the lead screw nut 2324 completes the first sliding process and passes the middle position of the reciprocating lead screw 2322 to begin the second sliding process, as the sliding elastic rope 254 of the lead screw nut 2324 tightens, it generates a pulling force on the stop lever 2422, causing the stop lever 2422 to disengage from the stop block 2325. At this time, the elastic force of the coil spring 252 forces the shaft 2323 to rotate, which drives the driven wheel 255 to rotate through the drive wheel 253, thereby causing the shaft 2341 to drive the drive sprocket 2343 to rotate. The cleaning plate 231 on the chain 2345 quickly passes over the surface of the photovoltaic panel 221 to wipe and clean the surface of the photovoltaic panel 221.

[0063] During the second sliding process of the screw nut 2324 caused by the unidirectional rotation of the reciprocating screw 2322, the elastic rope 254 remains under tension, exerting a pulling force on the stop lever 2422. The tension of the second tension spring 2423 is insufficient to position the stop lever 2422 in a position that can prevent the stop block 2325 from rotating. Therefore, during the second sliding process of the screw nut 2324 caused by the unidirectional rotation of the reciprocating screw 2322, the rotating shaft 2323 can rotate under the drive of the reciprocating screw 2322, thereby causing the chain 2345 to rotate and the cleaning plate 231 to follow the chain 234. 5. The moving rod returns to its initial position after passing under the mounting plate 211. When the second sliding process of the lead screw nut 2324 ends and it is in the middle position of the reciprocating lead screw 2322, the elastic soft rope 254 begins to relax. The tension spring 2423 forces the stop bar 2422 to the position of blocking the rotation of the stop block 2325, thereby causing the reciprocating lead screw 2322 to rotate in one direction, causing the lead screw nut 2324 to perform the first sliding process, which compresses and stores energy in the coil spring 252. This process is repeated so that the cleaning plate 231 intermittently scrapes and cleans the surface of the photovoltaic panel 221.

[0064] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A green hydrogen production system coupling biomass electro-oxidation and water reduction, comprising: A pretreatment unit is used to dissolve polyhydroxy compounds in an alkaline aqueous solution to form an alkaline electrolyte containing polyhydroxy compounds; A photovoltaic power generation unit for providing electrical energy to electrolyze hydrogen includes a floating platform set at sea and multiple photovoltaic modules set on the floating platform. The floating platform is fixedly connected to the seabed via a mooring assembly. The photovoltaic modules include a support frame fixedly connected to the floating platform, photovoltaic panels set on the support frame, a controller, and an inverter. An electrolytic cell includes a shell, an ion exchange membrane located inside the shell, an anode plate, and a cathode plate. The ion exchange membrane divides the shell into an anode chamber and a cathode chamber. The anode plate is located inside the anode chamber and is electrically connected to the positive electrode of the photovoltaic power generation unit. The cathode plate is located inside the cathode chamber and is electrically connected to the negative electrode of the photovoltaic power generation unit. The shell is provided with a seawater inlet and a hydrogen outlet communicating with the cathode chamber, and a compound inlet and a chemical outlet communicating with the anode chamber.

2. The green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 1, characterized in that: The alkaline aqueous solution includes one or more aqueous solutions selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, potassium bicarbonate, potassium carbonate, sodium bicarbonate, and sodium carbonate.

3. The green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 1, characterized in that: The polyhydroxy compound includes one or more of glucose, xylitol, fructose, cellulose, xylan, galactose, sucrose, xylose, mannose, glycerol, and ethylene glycol.

4. The green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 1, characterized in that: The support frame includes two rows of opposing support rods and a mounting plate disposed on the upper end of the support rods, and the photovoltaic panel is disposed on the mounting plate.

5. A green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 4, characterized in that: The photovoltaic power generation unit also includes a cleaning mechanism for cleaning the photovoltaic panels. The cleaning mechanism includes a cleaning component and a drive assembly. The drive assembly includes a transmission rod group arranged parallel to one side of the photovoltaic panel, a power component that drives the transmission rod group to rotate, and a sprocket group that is connected to the transmission rod group. The power component drives the transmission rod group to rotate under the undulation of the floating plate. The cleaning component is disposed on the sprocket group.

6. A green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 5, characterized in that: The power component includes a pull rope, a tension spring disposed on the bottom surface of the float, and a weight located in the seawater. The upper end of the pull rope is wound around the transmission rod assembly, and the lower end of the pull rope passes downward through the float and is fixedly connected to the weight. The upper end of the tension spring is fixedly connected to the bottom surface of the float, and the lower end of the tension spring is fixedly connected to the pull rope.

7. A green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 6, characterized in that: The transmission rod assembly includes a first rotating shaft, a second rotating shaft, and a third rotating shaft arranged coaxially in sequence. A first bearing seat, a second bearing seat, and a third bearing seat are fixedly connected to the float plate for mounting the first rotating shaft, the second rotating shaft, and the third rotating shaft, respectively. A coil spring is provided on the first bearing seat to force the first rotating shaft to return to its original position. The first rotating shaft is connected to the second rotating shaft via a one-way coupling. The second rotating shaft is a reciprocating lead screw, and a lead screw nut is fitted onto the reciprocating lead screw. A sliding groove is provided on the second bearing seat in a direction parallel to the axis of the reciprocating lead screw. The lead screw nut is slidably connected to the sliding groove. The reciprocating lead screw and the second bearing seat are unidirectionally rotatable. The rotating shaft three is connected to the reciprocating lead screw via a coil spring two. A stop block is protruding on the rotating shaft three, and a drive wheel that is connected to the sprocket group is fixedly connected to the rotating shaft three. A stop bar is slidably mounted on the shaft seat two, and a tension spring two is provided on the shaft seat two to force the stop bar to slide and prevent the stop block from rotating with the rotating shaft three. The end of the stop bar away from the stop block is connected to the lead screw nut via an elastic soft rope. When the lead screw nut moves away from the stop bar and passes the middle position of the reciprocating lead screw, the lead screw nut forces the stop bar to slide away from the position that blocks the stop block through the elastic soft rope.

8. A green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 7, characterized in that: The sprocket assembly includes a fourth and a fifth rotating shaft, both parallel to the reciprocating lead screw; a drive sprocket symmetrically arranged on both sides of the mounting plate and fixedly connected to the fourth rotating shaft; a driven sprocket arranged on the fourth rotating shaft and driven by the drive sprocket; and a driven sprocket arranged on the fifth rotating shaft corresponding to the drive sprocket. The driven sprocket and the drive sprocket are connected by a chain drive. Both ends of the cleaning component are respectively connected to one of the chains.

9. A green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 8, characterized in that: The cleaning component includes a strip-shaped cleaning plate, with both ends of the cleaning plate being fixedly connected to chains on both sides of the mounting plate. A brush is provided on the surface of the cleaning plate near the photovoltaic panel, which contacts the upper surface of the photovoltaic panel.

10. A green hydrogen production system coupling biomass electro-oxidation and water reduction according to claim 8, characterized in that: Both the driving wheel and the driven wheel are meshing gears, and the driving wheel and the driven wheel are connected by a gear transmission.

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