CN110804739A - System and method for directly producing hydrogen by electrolyzing low-quality coal - Google Patents
System and method for directly producing hydrogen by electrolyzing low-quality coal Download PDFInfo
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- CN110804739A CN110804739A CN201911009419.2A CN201911009419A CN110804739A CN 110804739 A CN110804739 A CN 110804739A CN 201911009419 A CN201911009419 A CN 201911009419A CN 110804739 A CN110804739 A CN 110804739A
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/087—Heating or cooling the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/08—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles
- B01J8/10—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with moving particles moved by stirrers or by rotary drums or rotary receptacles or endless belts
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
- C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
- C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00008—Controlling the process
- B01J2208/00017—Controlling the temperature
- B01J2208/00433—Controlling the temperature using electromagnetic heating
- B01J2208/00451—Sunlight; Visible light
Abstract
The invention relates to a system and a method for directly producing hydrogen by electrolyzing low-quality coal, which are characterized in that: the system adopts an oxidation-reduction couple as a catalyst and a charge carrier in the process of electrolytic hydrogen production of low-quality coal, and mainly comprises a catalytic degradation unit, an electrolysis unit and a hydrogen purification and collection unit. The invention prepares hydrogen through the oxidation reaction of low-quality coal at low temperature, the low-quality coal does not need to pass the chemical pretreatment step, use as reactant directly; the high-temperature proton exchange membrane which can stably operate at 120-; two sets of catalytic degradation devices are adopted to form a catalytic degradation unit, so that the continuous and stable operation of the system is ensured; and a catholyte circulation loop is cancelled, so that the investment and the energy consumption are obviously reduced. The invention combines the catalytic degradation of low-quality coal with the processes of hydrogen preparation, purification and collection, and can realize the purpose of preparing high-purity hydrogen cleanly, efficiently and massively.
Description
Technical Field
The invention belongs to the technical field of hydrogen production, and particularly relates to a system and a method for directly producing hydrogen by electrolyzing low-quality coal.
Background
With the exhaustion of fossil fuels such as coal, petroleum, natural gas and the like and the increasing increase of environmental pollution, people are urgently required to find clean and renewable new energy sources. As a new energy-containing energy source, hydrogen energy has the advantages of wide source, high energy density, cleanness, no pollution and the like, and becomes an important means for promoting the energy structure transformation of China, constructing a low-carbon and high-efficiency modern energy system and realizing the strategy of new energy automobiles.
The development and utilization of hydrogen energy have become a hot problem in the scientific research and industrial fields.
Currently about 48% of hydrogen is produced from natural gas via a methane reforming process, but this approach is not renewable and the byproducts produced can be harmful to the environment. The hydrogen production by electrolyzing water has the characteristics of mature technology, high hydrogen purity and simple operation, but the electric energy consumption is higher and can reach 4.5-5.5kWh/m3This severely limits its commercialization process. Currently, hydrogen prepared by electrolyzing water only accounts for about 4% of the total yield. Biological fermentation and photocatalytic hydrogen production are potential hydrogen production methods, but have the problems of low efficiency and instability, and are difficult to realize industrialization.
The organic matter electrolytic hydrogen production system with the Chinese patent publication number of CN109536984A and the organic matter electrolytic hydrogen production method with the Chinese patent publication number of CN109355672A have the advantages of high efficiency, low energy consumption and large-scale production, but the operation temperature is low, and the oxidation degradation and electrochemical reaction rate of organic matters are limited at 50-120 ℃; a single catalytic degradation device is adopted, and the electrolyzed mixed solution directly returns to the catalytic degradation device, so that the components of the mixed solution entering the electrolytic bath are unstable; and a complex catholyte circulating loop is adopted, so that the equipment investment and the operation management cost are increased. Therefore, there is a need for an improved optimization of the prior art solutions.
Disclosure of Invention
The invention provides a system for directly producing hydrogen by electrolyzing low-quality coal, which mainly comprises a catalytic degradation unit, an electrolysis unit and a hydrogen purification and collection unit.
The catalytic degradation unit comprises at least two sets of same catalytic degradation devices, and the catalytic degradation devices respectively comprise a reaction kettle, a feeder, a stirrer and corresponding valves.
The catalytic degradation unit is a place where catalytic oxidation reaction of low-quality coal occurs. Under the action of oxidizing matter, the low-quality coal is oxidized and degraded under the action of heating or illumination or the action of heating and illumination simultaneously, and hydrogen protons are stripped from the low-quality coal and attached to the reducing matter.
The oxidizing substances of the catalytic oxidation reaction of the low-quality coal adopted by the catalytic degradation unit can be as follows: fe3+， Ag+，Mn4+，TEMPO+(tetramethylpiperidine oxide), AQ+Phosphomolybdic acid, phosphotungstic acid, vanadium substituted phosphomolybdic acid, and polyoxometallate.
The electrolysis unit comprises an electrolysis bath, a power supply and a switch, wherein the electrolysis bath consists of an end plate, a collector plate, an electrode plate and a high-temperature proton exchange membrane.
The cathode side of the high-temperature proton exchange membrane is not required to be coated with any catalyst.
The catalytic degradation unit is connected with the electrolysis unit through a diaphragm pump, a water processor, a liquid storage tank, a flowmeter, a corresponding valve and a pipeline to form an anolyte circulation loop. And a flowmeter and a valve are arranged on the pipeline of the anolyte circulation loop.
The volumes of the reaction kettle and the anode liquid storage tank are determined according to the scale of the system, so that stable anode liquid can be continuously supplied to the electrolysis unit to ensure the continuous and stable operation rule of the whole system.
Specifically, the flow rate of the anolyte supply can be calculated according to the hydrogen production amount and the hydrogen production efficiency of the system design, the flow rate of the anolyte required by the electrolysis unit in the period is calculated by combining the duration of low-quality coal oxidation and degradation, and the volumes of the reaction kettle and the anode liquid storage tank are 1.2-2 times of the flow value.
The water processor purifies the electrolyzed mixed solution by adopting a filtering mode and the like, impurities such as low-quality coal residues and the like in the mixed solution are filtered and discharged as waste liquid, and the treated aqueous solution enters an anode liquid storage tank and is supplemented with oxidizing substance aqueous solution and returned to the catalytic degradation unit for recycling.
The electrolysis unit is directly connected with the hydrogen purification and collection unit through a flowmeter and a corresponding pipeline.
The hydrogen purification and collection unit comprises a hydrogen purification device, a booster pump, a high-pressure gas cylinder and a corresponding valve.
The hydrogen purification device can adopt the processes of temperature and pressure swing adsorption and the like, and the purity of the purified hydrogen can reach more than 99.99 percent.
The low-quality coal has a carbon content of 50-85% on a dry basis, wherein the volatile matter is 30-80%.
The low-quality coal has a total solid organic carbon content of 100g/kg to 1000g/kg on a dry basis.
The ash content of the low-quality coal on a dry basis is 0.1-45%.
The average particle diameter of the low-quality coal is 15nm-100 cm.
The mass concentration of the low-quality coal is 0.5-70%.
The operation temperature of the catalytic degradation unit is matched with that of the electrolysis unit, and preferably, in the invention, the operation matching temperature of the catalytic degradation unit and the electrolysis unit is between 120 ℃ and 200 ℃.
The electrolytic cell is equipped with a high temperature proton exchange membrane that can operate continuously for long periods at 120-.
The cathode side of the high-temperature proton exchange membrane is not required to be coated with any catalyst.
Compared with an organic matter electrolytic hydrogen production system with Chinese patent publication No. CN109536984A and an organic matter electrolytic hydrogen production method with Chinese patent publication No. CN109355672A, the invention provides optimization and improvement measures from the following three aspects.
First, the electrolytic cell is equipped with a high-temperature proton exchange membrane capable of continuously operating at 120-200 ℃ for a long time, instead of a conventional proton exchange membrane.
The operation temperature of the catalytic degradation unit and the electrolysis unit is between 120-200 ℃, and the catalytic degradation unit and the electrolysis unit are always kept in temperature matching, so that the oxidative degradation and electrochemical reaction rate of the low-quality coal are effectively improved.
Second, the catalytic degradation unit is equipped with two catalytic degradation units instead of a single catalytic degradation unit.
The two sets of catalytic degradation devices alternately operate to continuously supply stable anolyte for the electrolysis unit, so that the continuous and stable operation of the whole system is ensured.
And thirdly, the electrolysis unit is directly connected with the hydrogen purification and collection unit through a flowmeter and a corresponding pipeline, a catholyte circulation loop is not needed, and the equipment investment is further reduced.
On the other hand, the invention provides a method for directly producing hydrogen by electrolyzing low-quality coal, which combines catalytic degradation and an electrochemical method by using the low-quality coal as a raw material and using an oxidation-reduction couple as a catalyst and a charge carrier to realize the purpose of efficiently, cleanly and massively preparing high-purity hydrogen.
The method for directly producing hydrogen by electrolyzing low-quality coal comprises the following implementation processes:
mixing the low-quality coal and the oxidizing substance in the catalytic degradation unit, heating under light or at the temperature of 120-;
sending the mixed solution after oxidative degradation into an electrolytic cell, transferring electrons to the cathode side through an external circuit, and allowing hydrogen protons to pass through a high-temperature proton exchange membrane (120-;
hydrogen generated by electrolysis directly enters a purification device to be purified to more than 99.99 percent, and is sent into a high-pressure gas cylinder to be stored for later use after being pressurized;
after the electrolyzed mixed solution is purified by a water processor, impurities such as low-quality coal residues and the like are removed, and the rest of the electrolyzed mixed solution enters an anode liquid storage tank and is supplemented with oxidizing substance water solution and returned to the catalytic degradation unit for recycling;
the two sets of catalytic degradation devices alternately operate to realize continuous catalytic degradation of low-quality coal, and continuously supply stable anolyte for the electrolysis unit, so that the whole system can continuously and stably operate.
By adopting the design and the improvement, the invention has the beneficial effects that:
the high-temperature proton exchange membrane is adopted, the continuous long-term operation can be carried out within the range of 120-200 ℃, and the oxidation degradation and electrochemical reaction rate of low-quality coal can be effectively improved;
by optimizing the catalytic degradation unit, stable anolyte can be continuously supplied to the electrolysis unit, and the continuous and stable operation of the whole system is ensured;
a catholyte loop is not required to be arranged, so that the investment and the energy consumption are obviously reduced;
the invention combines the catalytic degradation of low-quality coal with the processes of hydrogen preparation, purification and collection, and can realize the purpose of preparing high-purity hydrogen in a clean, high-efficiency and large-scale manner.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of a system for direct hydrogen production from low-grade coal by electrolysis.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings.
The invention provides a system for directly producing hydrogen by electrolyzing low-quality coal, which is shown in figure 1. The system consists of a catalytic degradation unit 1, an electrolysis unit 2 and a hydrogen purification and collection unit 3. The catalytic degradation unit comprises at least two sets of catalytic degradation devices, in this embodiment, two sets of catalytic degradation devices 11A and 11B, and the catalytic degradation devices 11A and 11B are respectively composed of reaction kettles 111A and 111B, feeders 112A and 112B, stirrers 113A and 113B, and corresponding valves 114A, 115A, 114B, and 115B. The electrolysis unit 2 comprises an electrolysis bath 21, a power supply 22 and a switch 23, wherein the electrolysis bath 21 consists of an end plate, a collector plate, an electrode plate and a high-temperature proton exchange membrane.
The catalytic degradation unit 1 is connected with the electrolysis unit 2 through an anolyte circulation loop 4, the anolyte circulation loop 4 comprises a diaphragm pump 41, a water treater 42, an anode liquid storage tank 43, a flowmeter 44, a pipeline 45, a pressure gauge 46 and a temperature gauge 47, mixed liquid in the catalytic degradation unit 1 enters the diaphragm pump 41 through the pipeline 45 and then flows into the electrolysis bath 21 through the pipeline 45, and preferably, the flowmeter 44, the pressure gauge 46 and the temperature gauge 47 are further arranged on the pipeline 45 between the diaphragm pump 41 and the electrolysis bath 21; after the mixed liquid reacts in the electrolytic bath 21, the mixed liquid flows into the water treatment device 42 through the pipe 45, the mixed liquid purified in the water treatment device 42 flows into the anode liquid storage tank 43, and the liquid in the anode liquid storage tank 43 flows into the catalytic degradation unit 1 again.
The electrolysis unit 2 is directly connected with the hydrogen purification collection unit 3 through a pipeline 5, and preferably, a flow meter 51 and a pressure gauge 52 are arranged on the pipeline 5.
The hydrogen purification and collection unit 3 includes a hydrogen purification device 31, a booster pump 32, a high-pressure gas cylinder 33, and a corresponding valve 34.
Respectively placing a certain amount of oxidizing substance water solution into a reaction kettle 111A and a reaction kettle 111B, and feeding the crushed and ground low-quality coal into the reaction kettle 111A by using a feeder 112A;
placing the mixed solution in the reaction kettle 111A under illumination or heating at 120-200 ℃ for 1-100 hours to sufficiently oxidize and degrade the low-quality coal, preferably, using a stirrer 113A to promote the reaction efficiency, and generating hydrogen protons and electrons through the reaction, wherein the hydrogen protons are attached to the reduced-state substances;
after the low-quality coal is sufficiently oxidized and degraded, opening a valve 114A, closing a valve 114B, a valve 115A and a valve 115B, conveying the degraded mixed solution to the electrolysis unit 2 through a diaphragm pump 41, and simultaneously adding the low-quality coal into a reaction kettle 111B to perform catalytic degradation reaction;
the operation temperature of the electrolysis unit 2 is matched with the reaction temperature in the catalytic degradation device 1, preferably, the temperature of the electrolysis unit 2 and the reaction temperature in the catalytic degradation device 1 are kept consistent and are both in the range of 120-200 ℃, electrons are transferred to the cathode side through an external circuit, and hydrogen protons pass through a high-temperature proton exchange membrane under the action of an external power plant and are combined with the electrons at the cathode side to generate hydrogen;
hydrogen generated by electrolysis directly enters a hydrogen purification device 31 through a pipeline 5, is purified to more than 99.99 percent, is pressurized by a booster pump 32 and then is sent into a high-pressure gas cylinder 33 for storage and standby;
after the electrolyzed mixed solution is purified by a water processor 42, impurities such as low-quality coal residue and the like are removed, and the rest is sent into an anode liquid storage tank 43;
after the mixed liquid in the reaction kettle 111A is used up and the low-quality coal in the reaction kettle 111B is fully degraded, closing the valve 114A, opening the valve 114B, and continuously feeding the mixed liquid in the reaction kettle 111B into the electrolysis unit 2 to maintain the system to operate;
meanwhile, an oxidizing substance water solution is supplemented into the anode liquid storage tank 43, the valve 115A is opened, the oxidizing substance water solution is returned to the reaction kettle 111A for cyclic utilization, low-quality coal is fed, and the oxidation degradation reaction is carried out again;
after the mixed liquid in the reaction kettle 111B is used up and the low-quality coal in the reaction kettle 111A is fully degraded, the valve 114B is closed, the valve 114A is opened, the mixed liquid in the reaction kettle 111A is sent to the electrolysis unit 2 again, and the system operation is maintained;
meanwhile, an oxidizing substance water solution is supplemented into the anode liquid storage tank 43, the valve 115B is opened, the oxidizing substance water solution is returned to the reaction kettle 111B for cyclic utilization, low-quality coal is fed, and oxidation degradation is carried out again;
continuous catalytic degradation of low-quality coal is realized by the alternate operation of the two sets of catalytic degradation devices 11A and 11B, and stable anolyte is continuously supplied to the electrolysis unit 2, so that the continuous and stable operation of the whole system is ensured.
The invention also provides a method for directly producing hydrogen by electrolyzing low-quality coal, which comprises the following steps:
mixing the low-quality coal and the oxidizing substance in the catalytic degradation unit, heating under light or at the temperature of 120-;
sending the mixed solution after catalytic degradation into an electrolytic cell, transferring electrons to the cathode side through an external circuit, and combining hydrogen protons and electrons at the cathode side to generate hydrogen through a high-temperature proton exchange membrane under the action of an external electric field;
hydrogen generated by electrolysis is sent to a purification device for purification and storage for later use;
and (3) purifying the electrolyzed mixed solution by a water processor to remove impurities such as low-quality coal residues, feeding the rest into an anode liquid storage tank, supplementing an oxidizing substance aqueous solution, and returning the rest to the catalytic degradation unit for recycling.
Through the design and improvement, the invention can effectively improve the catalytic degradation and electrochemical reaction rate of the low-quality coal and improve the hydrogen production efficiency; the continuous and stable operation of the hydrogen production system can be ensured, and the components of the mixed liquid entering the electrolytic tank 21 are kept stable; and a catholyte circulation loop is not required, so that the investment and the energy consumption are obviously reduced.
The invention combines the catalytic degradation of low-quality coal with the processes of hydrogen preparation, purification and collection, and can realize the purpose of preparing high-purity hydrogen cleanly, efficiently and massively.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (26)
1. A system for directly producing hydrogen by electrolyzing low-quality coal is characterized by comprising a catalytic degradation unit, an electrolysis unit and a hydrogen purification and collection unit; the catalytic degradation unit comprises a catalytic degradation device; the electrolysis unit comprises an electrolysis bath, a power supply and a switch; the hydrogen purification and collection unit comprises a hydrogen purification device, a booster pump, a high-pressure gas cylinder and a corresponding valve.
2. The system for directly producing hydrogen by electrolyzing low-quality coal according to claim 1, wherein the catalytic degradation device is composed of a reaction kettle, a feeder, a stirrer and a corresponding valve.
3. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 1, wherein the electrolytic cell is composed of an end plate, a collector plate, an electrode plate and a high-temperature proton exchange membrane.
4. The system for directly producing hydrogen by electrolyzing low-quality coal according to claim 1, wherein the catalytic degradation unit is connected with the electrolysis unit through an anolyte circulation loop, and the anolyte circulation loop comprises a diaphragm pump, a water treatment device and an anode liquid storage tank which are sequentially connected through pipelines.
5. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 4, wherein the pipeline of the anolyte circulating loop is provided with a flowmeter and a valve.
6. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 1, wherein the electrolysis unit is connected with the hydrogen purification and collection unit through a flow meter and corresponding pipelines.
7. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 1, wherein the hydrogen purification device purifies the hydrogen to more than 99.99%.
8. The system for directly producing hydrogen by electrolyzing low-quality coal according to claim 2, wherein the catalytic degradation device is added with the low-quality coal for catalytic oxidation reaction.
9. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 8, wherein said low-quality coal has a carbon content of 50-85% on dry basis, and a volatile matter content of 30-80%.
10. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 8, wherein: the low-quality coal has a total solid organic carbon content of 100g/kg to 1000g/kg on a dry basis.
11. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 8, wherein: the ash content of the low-quality coal on a dry basis is 0.1-45%.
12. The system for directly producing hydrogen by electrolyzing low-quality coal according to claim 8, wherein the average particle diameter of the low-quality coal is 15nm-100 cm.
13. The system for directly producing hydrogen by electrolyzing low-quality coal according to claim 8, wherein the mass concentration of the low-quality coal is 0.5 to 70%.
14. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 8, wherein the catalytic oxidation reaction of low-quality coal is initiated by light or heat or by the action of both light and heat.
15. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 8, wherein the oxidizing substance for the catalytic oxidation reaction of the low-quality coal is one or any combination of two or more of the following substances: fe3+，Ag+，Mn4+，TEMPO+(tetramethylpiperidine oxide), AQ+Phosphomolybdic acid, phosphotungstic acid, vanadium substituted phosphomolybdic acid, and polyoxometallate.
16. The system for directly producing hydrogen by electrolyzing low-quality coal according to claim 2, wherein the volume of the reaction kettle is determined according to the system scale, and the anode liquid with stable composition can be continuously supplied to the electrolysis unit, so that the continuous and stable operation of the whole system is ensured.
17. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 4, wherein the volume of the anode liquid storage tank is determined according to the system scale, and the anode liquid with stable composition can be continuously supplied to the electrolysis unit, so that the continuous and stable operation of the whole system is ensured.
18. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 4, wherein the water treatment device purifies the mixed solution after electrolysis to remove impurities such as low-quality coal residue, and the rest enters the anode liquid storage tank and supplements oxidizing substance aqueous solution, and the rest is returned to the catalytic degradation unit for recycling.
19. The system for directly producing hydrogen by electrolyzing low-grade coal as claimed in any one of claims 2 to 18, wherein the catalytic degradation unit comprises at least two sets of catalytic degradation devices which are alternately operated and continuously supply stable-composition anolyte to the electrolysis unit.
20. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in any one of claims 2 or 4 wherein the operation temperature of the catalytic degradation unit is between 120 ℃ and 200 ℃.
21. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 20, wherein the operating temperature of the electrolysis unit is between 120 ℃ and 200 ℃ and is matched with the operating temperature of the catalytic degradation unit.
22. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 3, wherein the operating temperature of the electrolysis unit is between 120 ℃ and 200 ℃.
23. The system for directly producing hydrogen by electrolyzing low-quality coal as recited in claim 22, wherein the operation temperature of the catalytic degradation unit is between 120 ℃ and 200 ℃ and is matched with the operation temperature of the electrolysis unit.
24. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 3, wherein the electrolytic cell is equipped with a high-temperature proton exchange membrane capable of continuously operating at 120-200 ℃ for a long time.
25. The system for directly producing hydrogen by electrolyzing low-quality coal as claimed in claim 3, wherein the cathode side of the high-temperature proton exchange membrane is not coated with any catalyst.
26. A method for directly producing hydrogen by electrolyzing low-quality coal is characterized in that a redox couple is adopted as a catalyst and a charge carrier in the process of producing hydrogen by electrolyzing low-quality coal, and comprises the following steps:
mixing the low-quality coal and the oxidizing substance in the catalytic degradation unit, and keeping the reaction condition of 120-;
sending the mixed solution after catalytic degradation into an electrolytic cell, transferring electrons to the cathode side through an external circuit, and combining hydrogen protons and electrons at the cathode side to generate hydrogen through a high-temperature proton exchange membrane under the action of an external electric field;
hydrogen generated by electrolysis is sent to a purification device for purification and storage for later use;
and (3) purifying the electrolyzed mixed solution by a water processor to remove impurities such as low-quality coal residues, feeding the rest into an anode liquid storage tank, supplementing an oxidizing substance aqueous solution, and returning the rest to the catalytic degradation unit for recycling.
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| CN112795948A (en) * | 2020-12-22 | 2021-05-14 | 哈尔滨工业大学 | Method for producing hydrogen by electrolyzing coal water slurry by using graphite felt electrode |
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| 甘师俊 等: "《中小城镇可持续发展先进适用技术指南》", 30 April 1998, 中国科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112795948A (en) * | 2020-12-22 | 2021-05-14 | 哈尔滨工业大学 | Method for producing hydrogen by electrolyzing coal water slurry by using graphite felt electrode |
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