High-efficiency hydrogen production double-chamber electrochemical membrane bioreactor

Abstract

The utility model relates to the technical field of biomass degradation hydrogen production, in particular to a high-efficiency hydrogen production double-chamber electrochemical membrane bioreactor which comprises a reactor main body, a cathode chamber and an anode chamber are arranged in the reactor main body, a proton exchange membrane is arranged between the cathode chamber and the anode chamber, and the anode chamber is communicated with the cathode chamber. A cathode and an anode are respectively arranged in the cathode chamber and the anode chamber, the cathode and the anode are connected with a weak current strengthening power supply, and a gas collecting port is formed in the top of the cathode chamber and is connected with a gas collecting device. The double-chamber electrochemical membrane bioreactor is formed by externally connecting a power supply and arranging the proton exchange membrane in the reactor main body, and the proton exchange membrane can effectively transfer protons and prevent the flow of electrons, reduce the waste of energy and unnecessary chemical reaction, improve the electrolytic efficiency, ensure that only hydrogen is generated at the cathode, and improve the electrochemical efficiency. The hydrogen purity and the hydrogen production efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production by biomass degradation, in particular to a high-efficiency hydrogen production double-chamber electrochemical membrane bioreactor. Background Art

[0002] Compared with fossil energy, hydrogen energy has larger reserves, higher calorific value and is cleaner. The calorific value per unit mass of hydrogen is about 120-140MJ / kg, which is a more efficient fuel than fossil energy. In addition, cleanliness is also one of the advantages of hydrogen energy. Hydrogen combustion only produces water and will not have a negative impact on the environment.

[0003] However, traditional chemical hydrogen production not only consumes fossil energy, but also causes environmental pollution. Biohydrogen production uses the metabolic pathways of microorganisms to produce hydrogen at room temperature and pressure. Initial research on biohydrogen production at home and abroad focused on photolysis of water to produce hydrogen and dark fermentation to produce hydrogen, while research on photofermentation to produce hydrogen was relatively small. Straw is a commonly used raw material for biohydrogen production. The cellulose and hemicellulose contained in straw are high-quality biomass resources. Using agricultural straw waste to produce hydrogen can not only effectively solve the problems of agricultural waste burning and composting, but also further generate clean energy.

[0004] At present, the efficiency of biomass hydrogen production is not high, and there is an urgent need for a biomass hydrogen production device with high hydrogen production efficiency. Utility Model Content

[0005] The utility model aims to provide a high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor, which can utilize biomass raw materials to prepare clean energy hydrogen, improve hydrogen production efficiency, and improve hydrogen purity.

[0006] The utility model provides a high-efficiency hydrogen production double-chamber electrochemical membrane bioreactor, comprising a reactor body, wherein a cathode chamber and an anode chamber are arranged in the reactor body, a proton exchange membrane is arranged between the cathode chamber and the anode chamber, a cathode and an anode are arranged in the cathode chamber and the anode chamber respectively, the cathode and the anode are connected to a weak current strengthening power supply, a gas collecting port is arranged on the top of the cathode chamber, and the gas collecting port is connected to a gas collecting device.

[0007] Preferably, the side wall of the reactor body is a jacket structure, a circulating water inlet is provided at the bottom of the jacket, a circulating water outlet is provided at the top of the jacket, and the circulating water outlet is sequentially connected to a thermostat and the circulating water inlet through a pipeline.

[0008] Preferably, the constant temperature device is a constant temperature water bath or a constant temperature water heater.

[0009] Preferably, the cathode is made of carbon felt, and the anode is made of carbon brush.

[0010] Preferably, the cathode chamber and the anode chamber are both provided with detection devices, and the detection devices are connected to a control panel via a wire.

[0011] Preferably, the detection devices each include a temperature sensor and a pH sensor.

[0012] Preferably, the cathode and the anode are also connected to an electrochemical workstation.

[0013] Preferably, the gas collecting device adopts a gas collecting bag, and a gas collecting valve is provided between the gas collecting bag and the gas collecting port.

[0014] Preferably, a cathode chamber feeding port and an anode chamber feeding port are respectively provided at the top of the cathode chamber and the top of the anode chamber.

[0015] Preferably, a cathode chamber sampling and draining port is provided at the bottom of the cathode chamber, and an anode chamber sampling and draining port is provided at the bottom of the anode chamber. Valves are provided at both the cathode chamber sampling and draining port and the anode chamber sampling and draining port.

[0016] Beneficial effects:

[0017] The utility model uses an external power supply and arranges a proton exchange membrane in the reactor body to form a double-chamber electrochemical membrane bioreactor, which can accelerate the electron transfer in the reaction process, promote the further degradation of biomass into hydrogen, and increase the hydrogen production. The arrangement of the proton exchange membrane can effectively transfer protons and prevent the flow of electrons, reduce energy waste and unnecessary chemical reactions, improve electrolysis efficiency, ensure that only hydrogen is produced at the cathode, and improve the hydrogen purity and hydrogen production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the top view of the structure of the reactor body of the utility model.

[0021] Description of reference numerals:

[0022] 1-reactor body, 2-anode chamber, 3-anode, 4-circulating water outlet, 5-anode port, 6-anode chamber feeding port, 7-detection device, 8-control panel, 9-weak current enhancement power supply, 10-electrochemical workstation, 11-constant temperature device, 12-cathode port, 13-cathode chamber feeding port, 14-gas collecting bag, 15-gas collecting valve, 16-gas collecting port, 17-cathode, 18-cathode chamber, 19-circulating water inlet, 20-cathode chamber sampling and drainage port, 21-proton exchange membrane, 22-anode chamber sampling and drainage port, 23-jacket, 24-pipeline, 25-anode chamber detection port, 26-cathode chamber detection port. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1-Figure 2As shown, a high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor includes a reactor body 1, wherein a cathode chamber 18 and an anode chamber 2 are arranged in the reactor body 1, and a proton exchange membrane 21 is arranged between the cathode chamber 18 and the anode chamber 2. The proton exchange membrane 21 only allows H + By transferring from the anode chamber 2 to the cathode chamber 18, not only protons are effectively transferred but also the flow of electrons can be prevented, energy waste and unnecessary chemical reactions are reduced, electrolysis efficiency is improved, and hydrogen purity is improved. A cathode 17 and an anode 3 are respectively arranged in the cathode chamber 18 and the anode chamber 2, wherein the cathode 17 is made of carbon felt and the anode 3 is made of carbon brushes. The cathode 17 and the anode 3 are connected to a weak current strengthening power supply 9 through a second wire, and the weak current strengthening power supply 9 is used for power supply. A cathode port 12 and an anode port 5 are respectively arranged at the top of the cathode chamber 18 and the anode chamber 2 corresponding to the second wire. Under the action of electrochemistry, the degradation of the straw can be further promoted to produce more hydrogen, which solves the problem that the traditional anaerobic fermentation straw degradation is incomplete and can only produce a small amount of hydrogen, and increases the hydrogen production.

[0028] The cathode 17 and the anode 3 are also connected to an electrochemical workstation 10. The electrochemical workstation 10 is a common device in the art, and its structure is not described in detail here. The electrochemical workstation 10 can analyze the change of reaction current voltage parameters by cyclic voltammetry, linear sweep voltammetry, etc., and detect the change of weak current.

[0029] A gas collecting port 16 is provided at the top of the cathode chamber 18, and the gas collecting port 16 is connected to a gas collecting device. The gas collecting device adopts a gas collecting bag 14, and a gas collecting valve 15 is provided between the gas collecting bag 14 and the gas collecting port 16. The hydrogen generated in the cathode chamber 18 can be simply and conveniently collected by the gas collecting bag 14, and the amount of gas collected by the gas collecting bag 14 can be controlled by the gas collecting valve 15, and then the proportion of hydrogen in the gas can be analyzed by a gas chromatograph and the hydrogen production can be calculated.

[0030] The cathode chamber 18 and the anode chamber 2 are both provided with a detection device 7, and the detection device 7 includes a temperature sensor and a pH sensor, which can monitor the temperature and pH value changes in the reaction process in real time. The detection device 7 is connected to the control panel 8 through a first wire. The cathode chamber 18 and the anode chamber 2 are respectively provided with a cathode chamber detection port 26 and an anode chamber detection port 25 at the top, and the first wire passes through the cathode chamber detection port 26 and the anode chamber detection port 25 to connect the control panel 8. The control panel 8 includes a PLC controller and a display panel, and the PLC controller and the display panel are electrically connected. The display panel can display the current detection result of the detection device 7 in real time, which is convenient for the experimenter to control the parameter stability.

[0031] The cathode chamber 18 and the anode chamber 2 are provided with a cathode chamber feeding port 13 and an anode chamber feeding port 6 at the top, respectively. The cathode chamber 18 and the anode chamber 2 can be fed through the cathode chamber feeding port 13 and the anode chamber feeding port 6. The reaction raw materials can be pretreated straw or kitchen waste, thermal pretreated activated sludge or cow dung compost, prepared vitamin solution, mineral salt solution, etc. The utility model can also include a magnetic stirring device, which stirs the reaction liquid after feeding to make the reaction liquid uniform and the microorganisms evenly distributed.

[0032] A cathode chamber sampling and drainage port 20 is provided at the bottom of the cathode chamber 18, and an anode chamber sampling and drainage port 22 is provided at the bottom of the anode chamber 2. Valves are provided at the cathode chamber sampling and drainage port 20 and the anode chamber sampling and drainage port 22. By regulating the valves, gas collection and sampling and drainage can be strictly controlled. Through the cathode chamber sampling and drainage port 20 and the anode chamber sampling and drainage port 22, samples of the liquid phase of the cathode chamber 18 and the anode chamber 2 during the reaction can be collected, and then liquid chromatography is used to analyze the changes in the components of the reaction liquid, and high-throughput sequencing is used to analyze the changes in the microbial community, providing theoretical support for the resource processing of the reaction liquid.

[0033] The side wall of the reactor body 1 is a jacket 23 structure, a circulating water inlet 19 is provided at the bottom of the jacket 23, a circulating water outlet 4 is provided at the top of the jacket 23, and the circulating water inlet 19 and the circulating water outlet 4 are respectively located on both sides of the jacket 23 to ensure that the circulating water flows fully in the jacket 23. The circulating water outlet 4 is connected to the thermostat 11 and the circulating water inlet 19 in sequence through the pipe 24. The thermostat 11 adopts one of a constant temperature water bath and a constant temperature water heater. The pipe 24 can be made of a rubber tube, which is soft and durable. The circulating water in the jacket 23 leaves the jacket 23 through the circulating water outlet 4, enters the thermostat 11 through the rubber tube, and then the constant temperature water enters the jacket 23 through the rubber tube and the circulating water inlet 19 to complete the cycle. The circulation process can better ensure the constant temperature efficiency.

[0034] Working process:

[0035] The reaction raw materials use pretreated wheat straw as the reaction substrate, heat-pretreated activated sludge as the inoculant, and a vitamin system and a mineral salt system are added. The above raw materials are added into the cathode chamber 18 and the anode chamber 2 through the cathode chamber feed port 13 and the anode chamber feed port 6, and then nitrogen is purged for 3-5 minutes to discharge the air in the reactor body 1, to create an anaerobic environment for the reaction and to seal the cathode chamber feed port 13 and the anode chamber feed port 6; and the weak current enhancement power supply 9 is turned on for the reaction.

[0036] The temperature of the reaction system is set to 55±1°C, the pH is adjusted to 6-7, a magnetic stirring device is used to stir the reaction solution in the cathode chamber and the anode chamber 2, the magnetic stirring speed is 250r / min, and the weak current strengthening power supply 9 provides a voltage between 0.4-0.8V. The detection device 7 and the electrochemical workstation 10 can detect the changes in various parameters during the reaction. The gas generated by the reaction is collected by a gas collection bag 14 and the content and proportion of hydrogen in the total gas generated by the fermentation are analyzed by gas chromatography.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor, characterized in that: It comprises a reactor body, wherein a cathode chamber and an anode chamber are arranged in the reactor body, a proton exchange membrane is arranged between the cathode chamber and the anode chamber, a cathode and an anode are arranged in the cathode chamber and the anode chamber respectively, the cathode and the anode are connected to a weak current strengthening power supply, a gas collecting port is arranged on the top of the cathode chamber, and the gas collecting port is connected to a gas collecting device.

2. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1 is characterized in that: The side wall of the reactor body is a jacket structure, a circulating water inlet is arranged at the bottom of the jacket, a circulating water outlet is arranged at the top of the jacket, and the circulating water outlet is sequentially connected to a thermostat and the circulating water inlet through a pipeline.

3. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 2 is characterized in that: The constant temperature device is a constant temperature water bath pot or a constant temperature water heater.

4. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1 is characterized in that: The cathode is made of carbon felt, and the anode is made of carbon brush.

5. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1 is characterized in that: The cathode chamber and the anode chamber are both provided with detection devices, and the detection devices are connected to the control panel through wires.

6. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 5 is characterized in that: The detection devices each include a temperature sensor and a pH sensor.

7. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1 is characterized in that: The cathode and the anode are also connected to an electrochemical workstation.

8. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1 is characterized in that: The gas collecting device adopts a gas collecting bag, and a gas collecting valve is arranged between the gas collecting bag and the gas collecting port.

9. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1, characterized in that: A cathode chamber feeding port and an anode chamber feeding port are respectively provided at the top of the cathode chamber and the top of the anode chamber.

10. The high-efficiency hydrogen production dual-chamber electrochemical membrane bioreactor according to claim 1, characterized in that: A cathode chamber sampling and draining port is provided at the bottom of the cathode chamber, and an anode chamber sampling and draining port is provided at the bottom of the anode chamber. Valves are provided at the cathode chamber sampling and draining port and the anode chamber sampling and draining port.

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