CN210826376U - System for producing hydrogen by directly electrolyzing urea-containing wastewater by using renewable energy - Google Patents
System for producing hydrogen by directly electrolyzing urea-containing wastewater by using renewable energy Download PDFInfo
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- CN210826376U CN210826376U CN201921167442.XU CN201921167442U CN210826376U CN 210826376 U CN210826376 U CN 210826376U CN 201921167442 U CN201921167442 U CN 201921167442U CN 210826376 U CN210826376 U CN 210826376U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The utility model discloses a system for producing hydrogen by directly electrolyzing urea-containing wastewater by renewable energy, which comprises a renewable energy power generation module, an electric power regulation module, a pretreatment module for urea-containing wastewater, an alkaline urea electrolysis hydrogen production module, a gas/liquid separation, drying and purification module, an alkali liquor circulating system, a hydrogen storage tank and an anode product storage module, wherein the output end of the renewable energy power generation module is connected with the input end of the electric power regulation module, and the output end of the electric power regulation module is connected with the alkaline urea electrolysis hydrogen production module; the utility model discloses, promote in time consuming nearby of renewable energy electric power, reduce the hydrogen manufacturing cost, improve the tolerance of hydrogen manufacturing system to power fluctuation nature and intermittent type nature, carry out the coupling with hydrogen manufacturing technique and water treatment technology, avoided environmental pollution when having reduced the hydrogen manufacturing energy consumption, system extensive applicability is general, and stability is stronger, and the hydrogen purity of preparation is high, and simple process, easily industrial production.
Description
Technical Field
The utility model relates to the technical field of new energy and water treatment, in particular to a system for producing hydrogen by directly electrolyzing urea-containing wastewater by renewable energy.
Background
With the continuous expansion of the development and utilization scale of global renewable energy sources, the development of renewable energy sources is an important way for promoting energy transformation and coping with climate change in China. In recent years, the wind power and photovoltaic industries have been developed rapidly. However, the phenomena of wind and light abandon are very serious due to the limitation of power source fluctuation. The contradiction of unbalanced clean energy development is increasingly prominent, especially the problem of clean energy consumption is prominent, and the healthy and sustainable development of the power industry is severely restricted. Under the current situation, the development of a renewable energy large-scale consumption technology is urgently needed to solve the increasingly serious problem of electricity abandonment.
Renewable energy has obvious seasonal long-period fluctuation characteristics, and large-scale long-period storage and release cannot be realized by means of electricity storage and the like. The conventional water electrolysis hydrogen production technology is mature, but the electromotive force required for decomposition reaction is high (1.23V), which means that higher voltage must be used to promote the reaction. Urea can be oxidized in an electrochemical mode, nitrogen is obtained at the anode, and hydrogen is obtained at the cathode, and the standard electromotive force is 0.37V and is far lower than the reaction electromotive force of electrolyzed water. Urea is stable, non-toxic and non-flammable, and has been considered by more and more experts as an ideal hydrogen energy carrier. In addition, in the industrial urea synthesis process, the urea in the wastewater is extremely rich, and if the urea is not treated, the urea can pollute the underground water and directly threaten the human health. In view of the above situation, it is necessary to design a system for producing hydrogen by directly electrolyzing urea-containing wastewater by using renewable energy.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a system of renewable energy direct electrolysis urea-containing waste water hydrogen manufacturing promotes the nearby in time consumption of renewable energy electric power, reduces the hydrogen manufacturing cost, improves hydrogen manufacturing system to power volatility and intermittent type nature's tolerance, carries out the coupling with hydrogen manufacturing technique and water treatment technology, has avoided environmental pollution when having reduced the hydrogen manufacturing energy consumption, and system extensive applicability is general, and stability is stronger, and the hydrogen purity of preparation is high, and simple process, easily industrial production.
The purpose of the utility model can be realized by the following technical scheme:
a system for producing hydrogen by directly electrolyzing urea-containing wastewater by renewable energy comprises a renewable energy power generation module, an electric power regulation module, a urea-containing wastewater pretreatment module, an alkaline urea electrolysis hydrogen production module, a gas/liquid separation, drying and purification module, an alkali liquor circulation system, a hydrogen storage tank and an anode product storage module, wherein the output end of the renewable energy power generation module is connected with the input end of the electric power regulation module, the output end of the electric power regulation module is connected with the alkaline urea electrolysis hydrogen production module, the outlet of the urea-containing wastewater pretreatment module is connected with the electrolyte inlet of the alkaline urea electrolysis hydrogen production module, and the cathode gas outlet of the alkaline urea electrolysis hydrogen production module is connected with the gas inlet of the gas/liquid separation, drying and purification module;
the gas/liquid separation, drying and purification module inputs purified hydrogen into the hydrogen storage tank, the urea wastewater in the gas/liquid separation, drying and purification module returns to the alkaline urea electrolysis hydrogen production module through the alkali liquor circulating system, and the anode outlet of the alkaline urea electrolysis hydrogen production module is connected with the anode product storage module.
As a further aspect of the present invention: the renewable energy power generation module is any one or more of wind power generation, solar power generation and hydroelectric power generation.
As a further aspect of the present invention: the power conditioning module includes a transformer and an AC-DC controller.
As a further aspect of the present invention: the waste water after the urea-containing waste water pretreatment module is connected with the alkaline urea electrolytic hydrogen production module through the dosing pump.
As a further aspect of the present invention: the alkaline urea electrolysis hydrogen production module comprises an electrolytic cell, wherein the electrolytic cell is a conventional alkaline electrolytic cell, the anode of the electrolytic cell is nickel-based oxide or nickel-based alloy oxide, and the cathode of the electrolytic cell is nickel-based alloy.
The utility model has the advantages that: the renewable energy power generation module supplies power to the alkaline urea electrolytic hydrogen production module through the power regulation module, and the renewable energy is used for directly producing hydrogen through electrolysis, so that the nearby and timely consumption of the renewable energy power can be directly promoted, the hydrogen production cost can be reduced, meanwhile, the influence of the fluctuation and the intermittence of the renewable energy on a power grid is relieved, and the tolerance of a hydrogen production system to the fluctuation and the intermittence of a power supply is improved; the urea-containing wastewater passes through the urea-containing wastewater pretreatment module for pretreatment, the treated wastewater enters the alkaline urea electrolytic hydrogen production module through a dosing pump, the wastewater circulates for 2-3 times through an alkaline liquor circulating system, hydrogen generated by the cathode of the alkaline urea electrolytic hydrogen production module enters the gas/liquid separation, drying and purification module for separation, drying and purification, the urea-containing wastewater in the gas/liquid separation, drying and purification module returns to the alkaline urea electrolytic hydrogen production module through the alkaline liquor circulating system, the purified hydrogen enters the hydrogen storage tank, the anode product is discharged into the anode product storage module, and the urea-containing wastewater is selected as electrolyte for electrolytic hydrogen production, compared with the conventional alkaline electrolytic water for hydrogen production, the required voltage of an electrolytic cell is lower, the hydrogen production energy consumption is greatly reduced, meanwhile, the wastewater treatment can be effectively carried out, and the environmental pollution is reduced; the urea-containing wastewater pretreatment module in the system comprises a filtering device, an adjusting device and an alkali liquor adding device, wherein the filtering device is used for removing impurities in wastewater, the adjusting device is used for adjusting the mass concentration of urea to keep the mass concentration of the urea at 5-15%, an agent added in the alkali liquor adding device is a potassium hydroxide solution, the mass fraction is 30-40%, the urea-containing wastewater pretreatment module can keep the urea in an electrolytic cell in dynamic balance, the system can run efficiently and stably, the prepared hydrogen has high purity, and the prepared hydrogen can be used as a chemical plant raw material or directly used for hydrogen fuel equipment such as a hydrogen fuel cell system.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the system of the present invention;
in the figure: 1. a renewable energy power generation module; 2. a power conditioning module; 3. a urea-containing wastewater pretreatment module; 4. an alkaline urea electrolysis hydrogen production module; 5. a gas/liquid separation, drying and purification module; 6. an alkali liquor circulating system; 7. a hydrogen storage tank; 8. an anode product storage module.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, a system for producing hydrogen by directly electrolyzing urea-containing wastewater by using renewable energy, comprises a renewable energy power generation module 1, a power regulation module 2, a urea-containing wastewater pretreatment module 3, an alkaline urea electrolysis hydrogen production module 4, a gas/liquid separation, drying and purification module 5, an alkaline liquid circulation system 6, a hydrogen storage tank 7 and an anode product storage module 8, wherein the output end of the renewable energy power generation module 1 is connected with the input end of the power regulation module 2, the output end of the power regulation module 2 is connected with the alkaline urea electrolysis hydrogen production module 4, the outlet of the urea-containing wastewater pretreatment module 3 is connected with the electrolyte inlet of the alkaline urea electrolysis hydrogen production module 4, and the cathode gas outlet of the alkaline urea electrolysis hydrogen production module 4 is connected with the gas inlet of the gas/liquid separation, drying and purification module 5;
the gas/liquid separation, drying and purification module 5 inputs purified hydrogen into a hydrogen storage tank 7, urea wastewater in the gas/liquid separation, drying and purification module 5 returns to the alkaline urea electrolytic hydrogen production module 4 through an alkaline liquor circulating system 6, and an anode outlet of the alkaline urea electrolytic hydrogen production module 4 is connected with an anode product storage module 8;
the renewable energy power generation module 1 is any one or more of wind power generation, solar power generation and hydroelectric power generation and is used for supplying energy; the power conditioning module 2 comprises a transformer and an AC-DC controller for conditioning of power; the urea-containing wastewater pretreatment module 3 is used for filtering, adjusting and adding alkaline liquor for treating wastewater, and the treated wastewater enters the alkaline urea electrolytic hydrogen production module 4 through a dosing pump; the alkaline urea electrolysis hydrogen production module 4 comprises an electrolytic bath, wherein the electrolytic bath is a conventional alkaline electrolytic bath, the anode is nickel-based oxide or nickel-based alloy oxide, and the cathode is nickel-based alloy and is used for producing hydrogen through electrolysis; the anode product storage module 8 is used for solid waste storage;
the use method of the system comprises the following steps:
s1: the urea-containing wastewater passes through a urea-containing wastewater pretreatment module 3 for pretreatment;
wherein, the urea-containing wastewater pretreatment module 3 comprises a filtering device, an adjusting device and an alkali liquor adding device; the filtering device is used for removing impurities in the wastewater; the adjusting device is used for adjusting the mass concentration of the urea to be kept between 5 and 15 percent; the agent added in the alkaline solution adding device is potassium hydroxide solution, and the mass fraction is 30-40%;
s2: the treated wastewater enters an alkaline urea electrolytic hydrogen production module 4 through a dosing pump and circulates for 2-3 times through an alkaline liquor circulating system 6;
s3: the renewable energy power generation module 1 supplies power to the alkaline urea electrolytic hydrogen production module 4 through the power regulation module 2;
s4: hydrogen generated by the cathode of the alkaline urea electrolytic hydrogen production module 4 enters a gas/liquid separation, drying and purification module 5 for separation, drying and purification;
s5: the urea-containing wastewater in the gas/liquid separation, drying and purification module 5 returns to the alkaline urea electrolytic hydrogen production module 4 through the alkaline liquor circulating system 6;
s6: the purified hydrogen enters a hydrogen storage tank 7 and can be used as a chemical plant raw material or directly used for hydrogen fuel equipment such as a hydrogen fuel cell system;
wherein, the purity of the purified hydrogen is more than 99.999 percent;
s7: the anode product will be discharged into the anode product storage module 8;
wherein the anode product stores the CO generated by the anode in the module 82With OH in the electrolyte-The reaction produces carbonate without CO in the process2And (5) discharging.
The utility model discloses a theory of operation: the renewable energy power generation module 1 supplies power to the alkaline urea electrolytic hydrogen production module 4 through the power regulation module 2, and the renewable energy is used for directly producing hydrogen through electrolysis, so that the nearby and timely consumption of the renewable energy power can be directly promoted, the hydrogen production cost can be reduced, meanwhile, the influence of the fluctuation and the intermittence of the renewable energy on a power grid is relieved, and the tolerance of a hydrogen production system to the fluctuation and the intermittence of a power supply is improved; the urea-containing wastewater is pretreated by a urea-containing wastewater pretreatment module 3, the treated wastewater enters an alkaline urea electrolytic hydrogen production module 4 by a dosing pump, the wastewater is circulated for 2-3 times by an alkaline liquor circulating system 6, hydrogen generated by the cathode of the alkaline urea electrolytic hydrogen production module 4 enters a gas/liquid separation, drying and purification module 5 for separation, drying and purifying, wherein urea-containing wastewater in the gas/liquid separation, drying and purification module 5 returns to the alkaline urea electrolytic hydrogen production module 4 through the alkali liquor circulating system 6, purified hydrogen enters the hydrogen storage tank 7, an anode product is discharged into the anode product storage module 8, and urea-containing wastewater is selected as electrolyte to carry out electrolytic hydrogen production; the urea-containing wastewater pretreatment module 3 in the system comprises a filtering device, an adjusting device and an alkali liquor adding device, wherein the filtering device is used for removing impurities in wastewater, the adjusting device is used for adjusting the mass concentration of urea to keep the mass concentration of the urea at 5-15%, an agent added in the alkali liquor adding device is a potassium hydroxide solution, the mass fraction is 30-40%, the urea-containing wastewater pretreatment module 3 can keep the urea in an electrolytic cell in dynamic balance, the system can run efficiently and stably, the prepared hydrogen has high purity, and the prepared hydrogen can be used as a chemical plant raw material or directly used for hydrogen fuel equipment such as a hydrogen fuel cell system.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A system for producing hydrogen by directly electrolyzing urea-containing wastewater by renewable energy is characterized by comprising a renewable energy power generation module (1), a power regulation module (2), a urea-containing wastewater pretreatment module (3), an alkaline urea electrolysis hydrogen production module (4), a gas/liquid separation, drying and purification module (5), an alkaline liquor circulating system (6), a hydrogen storage tank (7) and an anode product storage module (8), the output end of the renewable energy power generation module (1) is connected with the input end of the power regulation module (2), and the output end of the power adjusting module (2) is connected with the alkaline urea electrolytic hydrogen production module (4), the outlet of the urea-containing wastewater pretreatment module (3) is connected with the electrolyte inlet of the alkaline urea electrolytic hydrogen production module (4), a cathode gas outlet of the alkaline urea electrolysis hydrogen production module (4) is connected with a gas inlet of the gas/liquid separation, drying and purification module (5);
the hydrogen gas after purification is input into a hydrogen storage tank (7) by the gas/liquid separation, drying and purification module (5), the urea wastewater in the gas/liquid separation, drying and purification module (5) returns to the alkaline urea electrolysis hydrogen production module (4) through an alkaline liquor circulating system (6), and an anode outlet of the alkaline urea electrolysis hydrogen production module (4) is connected with an anode product storage module (8).
2. The system for producing hydrogen by direct electrolysis of urea-containing wastewater by renewable energy according to claim 1, wherein the renewable energy power generation module (1) is any one or more of wind power generation, solar power generation and hydroelectric power generation.
3. System for the direct electrolysis of urea-containing wastewater for the production of hydrogen by renewable energy according to claim 1, characterized in that the power conditioning module (2) comprises a transformer and an AC-DC controller.
4. The system for producing hydrogen by directly electrolyzing urea-containing wastewater through renewable energy according to claim 1, wherein the wastewater treated by the urea-containing wastewater pretreatment module (3) is connected with the alkaline urea electrolysis hydrogen production module (4) through a dosing pump.
5. The system for producing hydrogen by direct electrolysis of urea-containing wastewater by using renewable energy sources as claimed in claim 1, wherein the alkaline urea electrolysis hydrogen production module (4) comprises an electrolytic cell, the electrolytic cell is an alkaline electrolytic cell, and the anode of the electrolytic cell is nickel-based oxide or nickel-based alloy oxide, and the cathode of the electrolytic cell is nickel-based alloy.
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| CN201921167442.XU CN210826376U (en) | 2019-07-23 | 2019-07-23 | System for producing hydrogen by directly electrolyzing urea-containing wastewater by using renewable energy |
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| CN201921167442.XU CN210826376U (en) | 2019-07-23 | 2019-07-23 | System for producing hydrogen by directly electrolyzing urea-containing wastewater by using renewable energy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273163A (en) * | 2019-07-23 | 2019-09-24 | 闫巍 | A kind of system and method for renewable energy Direct Electrolysis urea-containing waste water hydrogen manufacturing |
| CN112030182A (en) * | 2020-09-18 | 2020-12-04 | 安徽大学 | Electrochemical device, method for synthesizing hydrogen peroxide by electrochemically decomposing urea and application |
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2019
- 2019-07-23 CN CN201921167442.XU patent/CN210826376U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110273163A (en) * | 2019-07-23 | 2019-09-24 | 闫巍 | A kind of system and method for renewable energy Direct Electrolysis urea-containing waste water hydrogen manufacturing |
| CN112030182A (en) * | 2020-09-18 | 2020-12-04 | 安徽大学 | Electrochemical device, method for synthesizing hydrogen peroxide by electrochemically decomposing urea and application |
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