Biogas energy storage system
By generating oxygen and hydrogen through water electrolysis equipment, combined with biogas digester power generation and carbon dioxide catalytic methane production, the problems of energy storage and clean energy generation during low-peak electricity consumption are solved, and efficient energy utilization with zero carbon emissions is achieved.
Patent Information
- Application Number
- CN202422692306.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-11-06
AI Technical Summary
During off-peak electricity consumption, surplus electricity cannot be effectively stored and utilized, and existing biogas power generation technology fails to achieve efficient power generation of clean energy and zero carbon emissions.
Oxygen and hydrogen are generated through water electrolysis equipment, compressed and stored, and used in biogas digesters to generate electricity during low-gas periods. Carbon dioxide and hydrogen are combined to catalytically generate methane, achieving clean energy power generation. Waste heat is recovered through a thermal cycle loop to achieve zero carbon emissions.
It realizes the storage and efficient utilization of clean energy during low-peak electricity consumption, achieves zero-carbon emission clean energy power generation, and improves energy utilization efficiency.
Smart Images
Figure CN223434415U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the energy comprehensive utilization recycling technology field, specifically relates to a marsh gas energy storage system. BACKGROUND
[0002] Peak-valley electricity price is also called "time-of-use electricity price". It is a kind of electricity price system that calculates electricity charges according to peak electricity and valley electricity. Peak electricity generally refers to electricity use during the time when electricity supply is tight due to the concentration of electricity users, such as during the day, and the charging standard is higher. Valley electricity generally refers to electricity use during the time when electricity supply is sufficient due to the small number of electricity users, such as at night, and the charging standard is lower. Implementing peak-valley electricity price is conducive to prompting electricity users to stagger their electricity use time and fully utilizing equipment and energy.
[0003] However, during valley electricity, there is a large amount of surplus electricity that is not used, but can be stored through energy storage technology. Energy storage technology has multiple types, including mechanical energy storage, electrochemical energy storage, chemical energy storage, and thermal energy storage.
[0004] Biogas power generation technology is a clean, renewable, and green sustainable energy generation method that uses biogas as fuel to generate electricity through a biogas generator set. Biogas power generation not only effectively utilizes the biomass energy in waste, but also helps reduce environmental pollution and promotes sustainable development.
[0005] The problem to be solved by the utility model is to fully utilize valley electricity through biogas treatment and energy storage to achieve peak load shifting. CONTENT OF THE UTILITY MODEL
[0006] One object of the utility model is to solve at least the above problems and provide at least the advantages to be explained later.
[0007] The utility model provides the following technical solutions: a biogas energy storage system, comprising a water electrolysis device and a biogas tank;
[0008] The oxygen outlet of the water electrolysis device is connected to an oxygen compressor, an oxygen storage tank, a mixer, and a combustion chamber in sequence, and the hydrogen outlet of the water electrolysis device is connected to a hydrogen compressor and a first heat exchange unit in sequence;
[0009] The biogas tank is connected to the combustion chamber, the combustion chamber is connected to a turbine generator, the carbon dioxide outlet of the turbine generator is divided into two branch pipelines after a flow divider, the first branch pipeline is connected to the mixer, and the second branch pipeline is connected to a second heat exchange unit;
[0010] The hydrogen outlet of the first heat exchange unit and the carbon dioxide outlet of the second heat exchange unit are connected to a methane generation device.
[0011] Further, the first heat exchange unit comprises a first heat exchanger, a hydrogen storage tank, a second heat exchanger, a low-temperature water storage tank and a high-temperature water storage tank; the hydrogen compressor, the first heat exchanger, the hydrogen storage tank, the second heat exchanger and the methane generating device are sequentially connected; the first heat exchanger, the high-temperature water storage tank, the second heat exchanger, the low-temperature water storage tank and the first heat exchanger are sequentially connected to form a heat circulation loop.
[0012] Further, the second heat exchange unit comprises a third heat exchanger, a carbon dioxide storage tank, a fourth heat exchanger, a low-temperature hot oil storage tank and a high-temperature hot oil storage tank; the flow divider, the third heat exchanger, the carbon dioxide storage tank, the fourth heat exchanger and the methane generating device are sequentially connected; the third heat exchanger, the high-temperature hot oil storage tank, the fourth heat exchanger, the low-temperature hot oil storage tank and the third heat exchanger are sequentially connected to form a heat circulation loop.
[0013] Further, the methane outlet of the methane generating device is sequentially connected with a condenser and a methane storage device.
[0014] Compared with the prior art, the advantages of the utility model lie in that:
[0015] 1. In the low valley, water is electrolyzed by the water electrolysis device to obtain oxygen and hydrogen, and the oxygen and hydrogen are stored after being compressed, and when electricity is used, clean energy power generation is realized through the biogas tank, the mixer, the combustion chamber, the turbine generator and the stored oxygen;
[0016] 2. The carbon dioxide is integrated into the biogas power generation process to utilize the compressed carbon dioxide to store energy and generate electricity;
[0017] 3. Methane is generated by catalyzing carbon dioxide and hydrogen, so that the fossil energy storage is realized;
[0018] 4. The system realizes clean energy power generation and achieves zero carbon emission. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a structural schematic view of the utility model.
[0020] In the figure: 1-water electrolysis device;2-oxygen compressor;3-oxygen storage tank;4-biogas tank;5-combustion chamber;6-turbine generator;7-hydrogen compressor;8-first heat exchanger;9-hydrogen storage tank;10-second heat exchanger;11-mixer;12-flow divider;13-third heat exchanger;14-carbon dioxide storage tank;15-fourth heat exchanger;16-methane generating device;17-condenser;18-methane storage device;19-low-temperature water storage tank;20-high-temperature water storage tank;21-low-temperature hot oil storage tank;22-high-temperature hot oil storage tank. DETAILED DESCRIPTION
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] like Figure 1 As shown: A biogas energy storage system includes a water electrolysis device 1 and a biogas tank 4; the oxygen outlet of the water electrolysis device 1 is connected to the oxygen compressor 2, the oxygen storage tank 3, the mixer 11 and the combustion chamber 5 in sequence, and the hydrogen outlet of the water electrolysis device 1 is connected to the hydrogen compressor 7 and the first heat exchange unit in sequence; the biogas tank 4 is connected to the combustion chamber 5, and the combustion chamber 5 is connected to the turbine generator 6. The carbon dioxide outlet of the turbine generator 6 is divided into two branch pipelines after passing through the splitter 12, the first branch pipeline is connected to the mixer 11, and the second branch pipeline is connected to the second heat exchange unit; the hydrogen outlet of the first heat exchange unit and the carbon dioxide outlet of the second heat exchange unit are connected to the methane generation device 16, and the methane outlet of the methane generation device 16 is connected to the condenser 17 and the methane storage device 18 in sequence.
[0023] The first heat exchange unit includes a first heat exchanger 8, a hydrogen storage tank 9, a second heat exchanger 10, a low-temperature water storage tank 19 and a high-temperature water storage tank 20; the hydrogen compressor 7, the first heat exchanger 8, the hydrogen storage tank 9, the second heat exchanger 10, and the methane generation equipment 16 are connected in sequence; the first heat exchanger 8, the high-temperature water storage tank 20, the second heat exchanger 10, the low-temperature water storage tank 19, and the first heat exchanger 8 are connected in sequence to form a heat circulation loop.
[0024] The second heat exchange unit includes a third heat exchanger 13, a carbon dioxide storage tank 14, a fourth heat exchanger 15, a low-temperature hot oil storage tank 21 and a high-temperature hot oil storage tank 22; the diverter 12, the third heat exchanger 13, the carbon dioxide storage tank 14, the fourth heat exchanger 15, and the methane generation equipment 16 are connected in sequence; the third heat exchanger 13, the high-temperature hot oil storage tank 22, the fourth heat exchanger 15, the low-temperature hot oil storage tank 21, and the third heat exchanger 13 are connected in sequence to form a heat circulation loop.
[0025] When the power station is working, the water electrolysis equipment 1 electrolyzes hydrogen and oxygen. The oxygen is compressed by the oxygen compressor 2 and then stored in the oxygen storage tank 3. The hydrogen is first compressed by the hydrogen compressor 7 and then the compression heat is recovered through the first heat exchanger 8. The high-pressure hydrogen is finally stored in the hydrogen storage tank 9.
[0026] The high pressure oxygen flows out from the oxygen storage tank 3, mixes with the carbon dioxide in the mixer 11, and then burns with the biogas in the biogas tank 4 in the combustion chamber 5, the high temperature and high pressure carbon dioxide generated by the burning enters the turbine generator 6 together with the water vapor, the water vapor is condensed into water in the turbine generator 6, the high purity carbon dioxide enters the flow divider 12, part of the carbon dioxide enters the mixer 11, and the other part of the carbon dioxide is recycled after the waste heat is recovered by the third heat exchanger 13, and then enters the carbon dioxide storage tank 14 for storage.
[0027] The carbon dioxide flows out from the carbon dioxide storage tank 14, is heated in the fourth heat exchanger 15, enters the methane generating device 16, the hydrogen flows out from the hydrogen storage tank 9, is heated in the second heat exchanger 10, and then enters the methane generating device 16, the carbon dioxide and the hydrogen are catalytically generated into methane under high temperature and high pressure, the methane is condensed by the condenser 17, and then enters the methane storage device 18.
[0028] The water in the low temperature water storage tank 19 enters the first heat exchanger 8 and exchanges heat with the high temperature hydrogen, the high temperature water enters the high temperature water tank 20 after recovering the compression heat, the high temperature water in the high temperature water tank 20 enters the second heat exchanger 10 to heat the hydrogen, the hot oil in the low temperature hot oil storage tank 21 enters the third heat exchanger 13 and exchanges heat with the carbon dioxide, the high temperature hot oil enters the high temperature hot oil storage tank 22 after recovering the waste heat, and the high temperature hot oil in the high temperature hot oil storage tank 22 enters the fourth heat exchanger 15 to heat the carbon dioxide.
[0029] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A biogas energy storage system, characterized by: It includes a water electrolysis device (1) and a biogas tank (4); The oxygen outlet of the water electrolysis device (1) is sequentially connected to the oxygen compressor (2), the oxygen storage tank (3), the mixer (11) and the combustion chamber (5), and the hydrogen outlet of the water electrolysis device (1) is sequentially connected to the hydrogen compressor (7) and the first heat exchange unit; The biogas tank (4) is connected to the combustion chamber (5), the combustion chamber (5) is connected to the turbine generator (6), and the carbon dioxide outlet of the turbine generator (6) is divided into two branch pipes after passing through a splitter (12), the first branch pipe is connected to the mixer (11), and the second branch pipe is connected to the second heat exchange unit; The hydrogen outlet of the first heat exchange unit and the carbon dioxide outlet of the second heat exchange unit are connected to a methane generating device (16).
2. A biogas energy storage system according to claim 1, characterized in that: The first heat exchange unit comprises a first heat exchanger (8), a hydrogen storage tank (9), a second heat exchanger (10), a low-temperature water storage tank (19) and a high-temperature water storage tank (20); the hydrogen compressor (7), the first heat exchanger (8), the hydrogen storage tank (9), the second heat exchanger (10) and the methane generation device (16) are connected in sequence; the first heat exchanger (8), the high-temperature water storage tank (20), the second heat exchanger (10), the low-temperature water storage tank (19) and the first heat exchanger (8) are connected in sequence to form a heat circulation loop.
3. A biogas energy storage system according to claim 2, characterized in that: The second heat exchange unit comprises a third heat exchanger (13), a carbon dioxide storage tank (14), a fourth heat exchanger (15), a low-temperature hot oil storage tank (21), and a high-temperature hot oil storage tank (22); the diverter (12), the third heat exchanger (13), the carbon dioxide storage tank (14), the fourth heat exchanger (15), and the methane generation device (16) are connected in sequence; the third heat exchanger (13), the high-temperature hot oil storage tank (22), the fourth heat exchanger (15), the low-temperature hot oil storage tank (21), and the third heat exchanger (13) are connected in sequence to form a heat circulation loop.
4. A biogas energy storage system according to any one of claims 1 to 3, characterized in that: The methane outlet of the methane generating device (16) is connected to a condenser (17) and a methane storage device (18) in sequence.