Renewable energy-driven hydrogen production and biomass conversion system with low energy consumption and high value

Abstract

The utility model relates to a hydrogen production technology and a biomass conversion technology, and aims to provide a hydrogen production and biomass conversion system which is low in energy consumption and high in value and is driven by renewable energy sources. The system comprises a renewable energy source input unit, a power supply regulation and control unit, an electrochemical reactor, a feed liquid circulation unit, a biomass refining unit, a hydrogen post-treatment unit, a fine chemical post-treatment unit and a hydrogen application unit, wherein the renewable energy source input unit is electrically connected with the power supply regulation and control unit and the electrochemical reactor in sequence through cables, and the liquid supply circulation unit, the biomass refining unit and the hydrogen aftertreatment unit are connected with the electrochemical reactor through pipelines respectively. And the hydrogen post-treatment unit is respectively connected with the fine chemical post-treatment unit and the hydrogen application unit through pipelines. According to the utility model, the biomass refining device is used for providing electrochemical reaction raw materials, so that the final purpose of green synthesis is achieved; the process is simple, and purification of hydrogen and high-valued chemicals is effectively achieved by combining a fine chemical post-treatment unit.

Description

Technical Field

[0001] The utility model relates to the fields of hydrogen production technology and biomass conversion technology, and in particular to a low-energy-consumption and high-value renewable energy-driven hydrogen production and biomass conversion system. Background Art

[0002] In the context of the current energy transition, the integration of renewable energy has brought new challenges to the stability of the power system. Renewable energy, especially wind and solar energy, exhibits significant volatility, randomness and seasonality, which significantly increase the operational uncertainty of the power system. With the rapid expansion of wind power and photovoltaic power generation, the complexity of power transmission and comprehensive consumption has become increasingly prominent. As a result, the phenomenon of wind and solar power abandonment is serious.

[0003] Hydrogen (H2) has the characteristics of high calorific value (143kJ / g) and zero carbon emissions of combustion products, and is regarded as an ideal green and clean energy. Compared with the carbon emission problem in the process of hydrogen production by reforming fossil fuels, the coupling of water electrolysis technology with renewable energy can achieve the preparation of zero-emission "green hydrogen", so it shows greater advantages in the fields of sustainability and environmental protection, and has received widespread attention in recent years. However, the anode oxygen evolution (OER) process in the water electrolysis process requires a four-electron transfer process, and its kinetic reaction is slow, which greatly reduces the energy efficiency of hydrogen production, and the added value of the anode product oxygen is not high. Commercial hydrogen production electrolyzers are usually equipped with heat exchangers to make them react at higher temperatures, which greatly increases the overall energy consumption of the equipment.

[0004] In addition, the development of biomass energy is of great significance for achieving the diversification and sustainable development of energy structure. Biomass aldehydes are a kind of biomass source compounds with wide application potential and have broad application prospects in the field of biomass high value. Organic acids prepared from biomass aldehydes, such as furoic acid, are very important organic synthetic raw materials and are intermediates for fungicides, food preservatives, plastic plasticizers, and chemical products such as medicines and spices. However, the traditional thermal catalytic preparation method not only has high energy consumption, but also has certain pollution to the environment.

[0005] Therefore, if a technical solution can be proposed to comprehensively solve the problems of the existing technologies such as the difficulty in absorbing wind and solar power, the low energy efficiency of hydrogen production equipment, and the high energy consumption of biomass conversion, it will be in line with the actual demand for the comprehensive utilization of renewable energy and high-value biomass. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the shortcomings of the existing technology and provide a low-energy-consumption and high-value renewable energy-driven hydrogen production and biomass conversion system; the technology aims to promote the timely consumption of renewable energy nearby, and combine hydrogen production technology with biomass green synthesis technology to further reduce the cost of hydrogen production and achieve high value of the product.

[0007] To solve the technical problem, the solution of the utility model is:

[0008] Provided is a low-energy-consumption, high-value renewable energy-driven hydrogen production and biomass conversion system, the system comprising: a renewable energy input unit, a power supply control unit, an electrochemical reactor, a liquid supply circulation unit, a biomass refining unit, a hydrogen post-processing unit, a fine chemical post-processing unit and a hydrogen application unit; wherein,

[0009] The renewable energy input unit is electrically connected to the power control unit and the electrochemical reactor in sequence through cables, providing controllable electric energy for the operation of the electrochemical reactor; the liquid supply circulation unit, the biomass refining unit and the hydrogen post-processing unit are respectively connected to the electrochemical reactor through pipelines, and are respectively used to provide the reactor with temperature-controllable circulating electrolyte, provide the reactor with aldehyde compounds converted from biomass as reactants, and separate and obtain hydrogen and anode electrolyte; the hydrogen post-processing unit is respectively connected to the fine chemical post-processing unit and the hydrogen application unit through pipelines, and is used to separate and purify organic products in the anode electrolyte and store or directly use the produced hydrogen.

[0010] As an improved solution, the renewable energy input unit is a photovoltaic power generation device or a solar power generation device or a combination of the two, and its electrical output end is connected to the electrical input end of the power control unit.

[0011] As an improved solution, the power control unit includes a transformer, a rectifier, an output regulator and a control host arranged in a cabinet, and multiple sensors arranged in an electrochemical reactor; the transformer, the rectifier, and the output regulator are connected in series in sequence, the transformer is connected to the electrical input end of the renewable energy input unit, and the output regulator is connected to the electrical input end of the electrochemical reactor; the control host is connected to the transformer, rectifier, output regulator and each sensor through signal lines.

[0012] As an improved solution, the sensor includes a pressure sensor, a temperature sensor, a flow rate sensor, a gas composition sensor, and a current and voltage sensor.

[0013] As an improved solution, the electrochemical reactor is a plurality of reaction chambers formed by stacking cathode plates, anode plates and diaphragms, and the diaphragm separates the cathode electrolyte from the anode electrolyte; the cathode plate adopts a titanium mesh or titanium foam loaded with a catalyst for hydrogen evolution reaction; the anode plate adopts a copper mesh, copper foam or copper plate pretreated by electrochemical redox as a copper-based catalyst for biomass aldehyde oxidation reaction; the anode electrolyte is a mixture of NaOH solution and aldehyde compounds, and the cathode electrolyte is one of H2SO4 solution, pure water or NaOH solution; the operating potential of the electrochemical reactor is controlled by a power control unit to achieve bipolar hydrogen production and preparation of fine compounds.

[0014] As an improved solution, the liquid supply circulation unit includes a cathode liquid storage tank, an anode liquid storage tank, a cooling water liquid storage tank, a cathode liquid circulation pump, an anode liquid circulation pump, a cooling water circulation pump, a filter and a heat exchanger; filters and heat exchangers are provided in both the cathode liquid circulation loop and the anode liquid circulation loop, and the heat exchanger forms a cooling water circulation loop with the cooling water storage tank and the cooling water circulation pump through pipelines.

[0015] As an improved solution, the biomass refining unit refers to a biomass aldehyde refining device, which includes a raw material pretreatment device, an acid hydrolysis reactor, a distiller, and a separation purifier arranged in sequence.

[0016] As an improved solution, the hydrogen post-processing unit includes a cathode gas-liquid separator, an anode gas-liquid separator, a hydrogen scrubber and a hydrogen dryer; wherein the inlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are respectively connected to the cathode reaction chamber and the anode reaction chamber in the electrochemical reactor through pipelines; the liquid outlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are respectively connected to the cathode liquid circulation loop and the fine chemical post-processing unit; the gas outlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are connected to the hydrogen scrubber through pipelines, and then connected to the hydrogen application unit through the hydrogen dryer; in the hydrogen scrubber, a neutral, alkaline or acidic buffer solution is selectively placed according to the acidity and alkalinity of the electrolyte.

[0017] As an improved solution, the fine chemical post-processing unit includes a primary extraction tower, an acid mixer, a secondary extraction tower, a dryer, a vacuum distillation tower and a cooling tower which are sequentially connected in series through pipelines.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) Compared with the traditional thermal catalytic reforming hydrogen production technology, electrocatalytic hydrogen production has the significant advantages of being greener and more environmentally friendly. The electrochemical reactor in the utility model adopts a bipolar hydrogen production technology of furfural oxidation reaction coupled with water electrolysis reaction. Compared with the traditional water electrolysis hydrogen production technology, it optimizes the starting potential and energy consumption and avoids the hydrogen / oxygen mixing problem; the electrochemical oxidation process is simple and can realize the oxidation preparation of biomass-based hydroxy acid organic matter at room temperature and pressure.

[0020] (2) In the utility model, the electrochemical reactor is driven by renewable energy and the electrochemical reaction raw materials are provided by the biomass refining device, and the two achieve the ultimate goal of green synthesis. In this process, the power supply control unit is used to reasonably control the reactor load fluctuation, thereby improving the utilization efficiency of wind and solar power; and the oxidized anode electrode can be reduced in situ by periodically outputting reverse current, so that the anode catalyst can maintain long-term activity without the need to shut down and disassemble the machine; in addition, the precise control of process parameters such as current and voltage can meet the needs of different products.

[0021] (3) The utility model utilizes a hydrogen post-processing unit to achieve post-processing of anode and cathode products, and the process is simple. In combination with a fine chemical post-processing unit, the purification of hydrogen and high-value chemicals can be effectively achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the hydrogen production and biomass conversion system in the utility model.

[0023] Figure 2 It is a schematic diagram of the power control unit in the utility model.

[0024] Figure 3 It is a schematic diagram of the hydrogen post-processing unit and the fine chemical post-processing unit in the utility model. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0026] Part I Implementation of the Utility Model

[0027] The low-energy-consumption and high-value renewable energy-driven hydrogen production and biomass conversion system described in the utility model includes: a renewable energy input unit, a power supply control unit, an electrochemical reactor, a liquid supply circulation unit, a biomass refining unit, a hydrogen post-processing unit, a fine chemical post-processing unit and a hydrogen application unit; wherein,

[0028] The renewable energy input unit is electrically connected to the power control unit and the electrochemical reactor in sequence through cables, providing controllable electric energy for the operation of the electrochemical reactor; the liquid supply circulation unit, the biomass refining unit and the hydrogen post-processing unit are respectively connected to the electrochemical reactor through pipelines, and are respectively used to provide the reactor with temperature-controllable circulating electrolyte, provide the reactor with aldehyde compounds converted from biomass as reactants, and separate and obtain hydrogen and anode electrolyte; the hydrogen post-processing unit is respectively connected to the fine chemical post-processing unit and the hydrogen application unit through pipelines, and is used to separate and purify organic products in the anode electrolyte and store or directly use the produced hydrogen.

[0029] The renewable energy input unit is a photovoltaic power generation device or a solar power generation device or a combination of the two, and its electrical output end is connected to the electrical input end of the power control unit.

[0030] The power control unit includes a transformer, a rectifier, an output regulator and a control host arranged in a cabinet, and a plurality of sensors arranged in an electrochemical reactor; the transformer, the rectifier and the output regulator are connected in series in sequence, the transformer is connected to the electrical input end of the renewable energy input unit, and the output regulator is connected to the electrical input end of the electrochemical reactor; the control host is connected to the transformer, the rectifier, the output regulator and each sensor through a signal line. The sensors include a pressure sensor, a temperature sensor, a flow rate sensor, a gas composition sensor, a current and a voltage sensor. By using the power control unit, the operating parameters can be accurately adjusted during the operation of the electrochemical reactor to ensure that the cathode / anode reaction is carried out under appropriate conditions. Based on the changes in the operating parameters monitored by the sensor, the rectification of electric energy, the detection and accurate control of the system operating parameters and the reactivation of the catalyst can be achieved.

[0031] The electrochemical reactor is a plurality of reaction chambers formed by stacking cathode plates, anode plates and diaphragms, and the diaphragm separates the cathode electrolyte from the anode electrolyte; the cathode plate uses a catalyst-loaded titanium mesh or titanium foam for hydrogen evolution reaction; the anode plate uses a copper mesh, copper foam or copper plate pretreated by electrochemical redox as a copper-based catalyst for biomass aldehyde oxidation reaction; the anode electrolyte is a mixture of NaOH solution and aldehyde compounds, and the cathode electrolyte is one of H2SO4 solution, pure water or NaOH solution; the operating potential of the electrochemical reactor is controlled by a power control unit to achieve bipolar hydrogen production and preparation of fine compounds. As an example, the specific structural form and reaction mechanism of the electrochemical reactor can refer to the record of patent document CN 117248225 A.

[0032] After long-term operation, if the anode copper-based electrode deactivates (oxidized to Cu at high potential), 2+), the current sensor can detect the continuous decrease of current density. After reaching the set attenuation threshold, it stops the original DC output and applies a reduction current to the anode copper electrode to make Cu 2+ Reduced to a low-valent state to achieve in-situ reactivation; this process is controlled by the control host in the power control unit, without the need to shut down, and is carried out automatically and periodically during operation, thereby maintaining the long-term activity of the anode catalyst.

[0033] The liquid supply circulation unit includes a cathode liquid storage tank, an anode liquid storage tank, a cooling water storage tank, a cathode liquid circulation pump, an anode liquid circulation pump, a cooling water circulation pump, a filter and a heat exchanger; a filter and a heat exchanger are provided in both the cathode liquid circulation loop and the anode liquid circulation loop, and the heat exchanger forms a cooling water circulation loop with the cooling water storage tank and the cooling water circulation pump through a pipeline. On the one hand, the unit is connected to the electrochemical reactor for the circulation of the cathode / anode electrolyte, and on the other hand, the temperature of the electrolyte is controlled by the heat exchanger.

[0034] The biomass refining unit refers to a biomass aldehyde refining device, which includes a raw material preprocessor, an acid hydrolysis reactor, a distiller, and a separation purifier arranged in sequence; the biomass raw material is cleaned and crushed in the raw material preprocessor, mixed with acid in the acid hydrolysis reactor, and then hydrolyzed under steam cooking conditions; the steam product is condensed and distilled in the distiller, and separated and purified in the separation purifier, and the refined product is finally obtained as an aldehyde compound product, specifically one of furfural, 5-hydroxymethylfurfural, vanillin or cinnamaldehyde. As an example, the specific structural form and reaction mechanism of the biomass aldehyde refining device can be referred to the document: Yin Yanfei et al. Biomass conversion to furfural and its application [J]. Biomass Chemical Engineering, 2011, 45(01): 53-56.

[0035] The hydrogen post-processing unit comprises a cathode gas-liquid separator, an anode gas-liquid separator, a hydrogen scrubber and a hydrogen dryer; wherein the inlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are respectively connected to the cathode reaction chamber and the anode reaction chamber in the electrochemical reactor through pipelines; the liquid outlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are respectively connected to the cathode liquid circulation loop and the fine chemical post-processing unit; the gas outlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are connected to the hydrogen scrubber through pipelines, and then connected to the hydrogen application unit through the hydrogen dryer; in the hydrogen scrubber, a neutral, alkaline or acidic buffer is selectively placed according to the acidity and alkalinity of the electrolyte.

[0036] The fine chemical post-processing unit includes a primary extraction tower, an acid mixer, a secondary extraction tower, a dryer, a vacuum distillation tower and a cooling tower which are sequentially connected in series through pipelines. The unit is used to separate and purify organic products in the anolyte, and the product is one of furoic acid, 2,5-furandicarboxylic acid, vanillic acid and cinnamic acid corresponding to the raw material output from the biomass refining unit. As an example: the primary extraction tower is used to separate the organic raw material phase and the inorganic product phase in the electrolyte; the acid mixer is used to adjust the pH of the aqueous phase to obtain the organic acid product; the secondary extraction tower is used to separate the organic acid product; the drying tower is used to remove moisture from the secondary extraction organic phase; the vacuum distillation tower is used to separate the organic acid product; the cooling tower is used to regenerate the extractant; wherein the extractant is one or a combination of dichloromethane, ether, toluene, benzene and butyl chloride.

[0037] Part II Specific Application Examples

[0038] like Figure 1 As shown, the low-energy-consumption and high-value renewable energy-driven hydrogen production and biomass conversion system described in the utility model includes: a renewable energy input unit, a power supply control unit, an electrochemical reactor, a liquid supply circulation unit, a biomass refining unit, a hydrogen post-processing unit, a fine chemical post-processing unit, and a hydrogen application unit.

[0039] The electric output end of the renewable energy input unit is connected to the power control unit and the electrochemical reactor in sequence through cables; the input end of the electrochemical reactor is connected to the raw material output end of the biomass refining unit; the output end of the electrochemical reactor is connected to the input end of the hydrogen post-processing unit; the liquid output end of the hydrogen post-processing unit is connected to the product input end of the fine chemical post-processing unit, and the gas output end is connected to the gas input end of the hydrogen application unit. The electrochemical reactor is also connected to the electrolyte output / input end of the liquid supply circulation unit.

[0040] The renewable energy input unit includes any one or a combination of photovoltaic and solar energy, which converts wind and solar energy into usable electrical energy for driving the electrochemical reactor. The power control unit includes a transformer, a rectifier, a sensor, an output regulator and a control host. The transformer and rectifier are used to rectify the renewable energy and convert it into usable direct current; the sensor is used to detect the operating parameters of the electrochemical reactor, including pressure, temperature, current, voltage and flow rate; the control host and the output regulator accurately control the parameters according to the specific reaction type to ensure that the cathode / anode reaction is carried out under appropriate conditions; and. By periodically outputting reverse current, the oxidized anode electrode is reduced in situ to keep the anode catalyst active for a long time. Such as Figure 2As shown in the figure, the sensor monitors the operating parameters of the electrochemical reactor in real time and feeds back to the control host. After long-term operation, the anode electrode is inevitably oxidized and the catalytic activity is reduced, so the energy consumption of the reactor increases. At this time, the control host changes the parameters of the output regulator and realizes the in-situ activation of the electrode through the reverse reduction current.

[0041] The liquid supply circulation unit includes a cathode / anode liquid storage tank, a cooling water liquid storage tank, a cathode / anode circulation pump, a cooling water circulation pump, a filter and a heat exchanger. On the one hand, the unit is connected to the electrochemical reactor for the circulation of the cathode / anode electrolyte, which flows through the cathode / anode liquid storage tank, the filter, the cathode / anode circulation pump, the electrochemical reactor and the hydrogen / fine chemical post-processing unit, and flows back to the storage tank. On the other hand, the temperature of the cathode / anode electrolyte is controlled by the heat exchanger, and the cooling water flows through the cooling water liquid storage tank, the cooling water circulation pump, the heat exchanger, and flows back to the storage tank. The heat exchanger is arranged on the cathode / anode electrolyte inflow pipeline.

[0042] The biomass refining unit includes a biomass aldehyde refining device, which converts the biomass raw materials into aldehyde compounds and provides reactants for the anode of the electrochemical reactor, specifically one of furfural, 5-hydroxymethylfurfural, vanillin, and cinnamaldehyde.

[0043] The electrochemical reactor is composed of stacked plates, electrodes, and diaphragms. The reaction chamber is separated by a diaphragm to separate the cathode and anode electrolytes. The cathode is for hydrogen evolution reaction, and the anode uses a copper-based catalyst for biomass aldehyde oxidation reaction. The reaction equation is 2R-CHO+OH - =R-COO - +2H2O+2e - +H2. The electrochemical reactor can realize bipolar hydrogen production and preparation of fine compounds at a lower operating potential. The product flows out of the reactor together with the electrolyte and enters the hydrogen post-processing unit or continues to circulate. The cathode / anolyte of the electrochemical reactor are independent of each other. The anode electrolyte is a mixture of NaOH solution and biomass aldehydes provided by the biomass refining unit. The cathode electrolyte is one of H2SO4 solution, pure water and NaOH solution. The anode copper-based catalyst is one of copper mesh, copper foam and copper plate, and has undergone electrochemical redox pretreatment.

[0044] The hydrogen post-processing unit includes anode / cathode gas-liquid separator, hydrogen scrubber and dryer, which can separate and purify hydrogen in cathode / cathode electrolyte. Figure 3 As shown, the gas-liquid separator is independent for the cathode / anode, and the hydrogen from the anode and cathode are collected together after gas-liquid separation and pass through the hydrogen scrubber and dryer together; neutral, alkaline or acidic buffer can be placed in the hydrogen scrubber according to the acidity and alkalinity of the electrolyte; thanks to the process principle, there is no need to consider the removal of oxygen in the hydrogen washing and drying process, only the electrolyte needs to be removed.

[0045] The fine chemical post-processing unit includes a primary extraction tower, an acid mixer, a secondary extraction tower, a dryer, a vacuum distillation tower and a cooling tower, which can separate and purify the organic products in the anolyte. The product is one of furoic acid, 2,5-furandicarboxylic acid, vanillic acid and cinnamic acid corresponding to the raw material. Figure 3 As shown, in this unit, the primary extraction tower is used to separate the organic raw material phase and the inorganic product phase in the electrolyte; the acid mixer is used to adjust the pH of the aqueous phase to obtain the organic acid product; the secondary extraction tower is used to separate the organic acid product; the drying tower is used to remove the moisture in the secondary extraction organic phase; the vacuum distillation tower is used to separate the organic acid product; the cooling tower is used to achieve the regeneration of the extractant; wherein the extractant is one or a combination of dichloromethane, ether, toluene, benzene and butyl chloride.

[0046] The hydrogen storage and application unit includes a storage tank and a fuel cell, which serves as the hydrogen application terminal of the system.

Claims

1. A low-energy-consumption, high-value renewable energy-driven hydrogen production and biomass conversion system, characterized in that: The system includes: a renewable energy input unit, a power supply control unit, an electrochemical reactor, a liquid supply circulation unit, a biomass refining unit, a hydrogen post-processing unit, a fine chemical post-processing unit and a hydrogen application unit; wherein, The renewable energy input unit is electrically connected to the power control unit and the electrochemical reactor in sequence through cables, providing controllable electric energy for the operation of the electrochemical reactor; the liquid supply circulation unit, the biomass refining unit and the hydrogen post-processing unit are respectively connected to the electrochemical reactor through pipelines, and are respectively used to provide the reactor with temperature-controllable circulating electrolyte, provide the reactor with aldehyde compounds converted from biomass as reactants, and separate and obtain hydrogen and anode electrolyte; the hydrogen post-processing unit is respectively connected to the fine chemical post-processing unit and the hydrogen application unit through pipelines, and is used to separate and purify organic products in the anode electrolyte and store or directly use the produced hydrogen.

2. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The renewable energy input unit is a photovoltaic power generation device or a solar power generation device or a combination of the two, and its electrical output end is connected to the electrical input end of the power control unit.

3. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The power control unit includes a transformer, a rectifier, an output regulator and a control host arranged in a cabinet, and multiple sensors arranged in an electrochemical reactor; the transformer, the rectifier and the output regulator are connected in series in sequence, the transformer is connected to the electrical input end of the renewable energy input unit, and the output regulator is connected to the electrical input end of the electrochemical reactor; the control host is respectively connected to the transformer, the rectifier, the output regulator and each sensor through signal lines.

4. The hydrogen production and biomass conversion system according to claim 3, characterized in that: The sensors include pressure sensors, temperature sensors, flow rate sensors, gas composition sensors, current and voltage sensors.

5. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The electrochemical reactor is a plurality of reaction chambers formed by stacking cathode plates, anode plates and diaphragms, wherein the diaphragm separates the cathode electrolyte from the anode electrolyte; the cathode plate adopts a titanium mesh or titanium foam loaded with a catalyst for hydrogen evolution reaction; the anode plate adopts a copper mesh, copper foam or copper plate pretreated by electrochemical redox as a copper-based catalyst for biomass aldehyde oxidation reaction; the anode electrolyte is a mixture of NaOH solution and aldehyde compounds, and the cathode electrolyte is one of H2SO4 solution, pure water or NaOH solution; the operating potential of the electrochemical reactor is controlled by a power control unit to realize bipolar hydrogen production and preparation of fine compounds.

6. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The liquid supply circulation unit includes a cathode liquid storage tank, an anode liquid storage tank, a cooling water liquid storage tank, a cathode liquid circulation pump, an anode liquid circulation pump, a cooling water circulation pump, a filter and a heat exchanger; filters and heat exchangers are provided in both the cathode liquid circulation loop and the anode liquid circulation loop, and the heat exchanger forms a cooling water circulation loop with the cooling water storage tank and the cooling water circulation pump through pipelines.

7. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The biomass refining unit refers to a biomass aldehyde refining device, which includes a raw material pretreatment device, an acid hydrolysis reactor, a distiller, and a separation purifier which are arranged in sequence.

8. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The hydrogen post-processing unit comprises a cathode gas-liquid separator, an anode gas-liquid separator, a hydrogen scrubber and a hydrogen dryer; wherein the inlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are respectively connected to the cathode reaction chamber and the anode reaction chamber in the electrochemical reactor through pipelines; the liquid outlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are respectively connected to the cathode liquid circulation loop and the fine chemical post-processing unit; the gas outlet ends of the cathode gas-liquid separator and the anode gas-liquid separator are connected to the hydrogen scrubber through pipelines, and then connected to the hydrogen application unit through the hydrogen dryer; in the hydrogen scrubber, a neutral, alkaline or acidic buffer is selectively placed according to the acidity and alkalinity of the electrolyte.

9. The hydrogen production and biomass conversion system according to claim 1, characterized in that: The fine chemical post-processing unit comprises a primary extraction tower, an acid mixer, a secondary extraction tower, a dryer, a vacuum distillation tower and a cooling tower which are sequentially connected in series through pipelines.

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