A low-carbon green power generation system coupled with ccus and wind-solar storage

Abstract

This utility model relates to a low-carbon green power generation system coupled with CCUS (Carbon Capture and Storage) and wind, solar, and energy storage. The system includes a wind and solar power generation module, an energy storage module, a carbon capture module, a compression storage module, an expansion power generation module, a water electrolysis hydrogen production module, a methanol synthesis module, and an energy control module. Through the deep coupling of multiple modules such as wind and solar power generation, energy storage, water electrolysis hydrogen production, carbon capture, compression storage, and expansion power generation, this utility model achieves efficient energy utilization, carbon emission reduction and resource utilization, improved economic efficiency and operational stability, and enhanced synergy and flexibility of the energy structure. It has significant environmental friendliness and sustainability, providing a new solution for achieving low-carbon green power generation.

Description

Technical Field

[0001] This utility model relates to the field of energy integration system and carbon emission reduction technology integration technology, specifically to a green and low-carbon power generation system that couples a carbon capture, utilization and storage (CCUS) system with wind power generation, photovoltaic power generation and energy storage system. Background Technology

[0002] Traditional thermal power plants and industrial parks are facing increasingly severe pressure to reduce emissions, placing higher demands on low-carbon, efficient, and sustainable energy systems. Among current low-carbon technology pathways, carbon capture, utilization, and storage (CCUS) technology is widely regarded as one of the key means to reduce greenhouse gas emissions and address climate change.

[0003] Among numerous carbon capture technologies, chemical absorption is widely used due to its mature process, especially the process route using monoethanolamine (MEA) solution as the absorbent, which is frequently adopted in practical engineering. This type of technology typically involves introducing carbon dioxide-containing flue gas into an absorption tower, where it undergoes an absorption reaction with the MEA solution, and then recovering high-purity carbon dioxide through a regeneration tower. However, MEA absorption generally suffers from technical bottlenecks such as high energy consumption per unit of carbon dioxide captured, high operating costs, and significant equipment corrosion risks, which restricts its wider application.

[0004] On the other hand, renewable energy technologies such as wind and solar power have developed rapidly in recent years. However, due to the instability of their natural resources, their output power is intermittent and fluctuates, often leading to resource waste problems such as "wind and solar curtailment". Although energy storage technology has been promoted in some areas to mitigate the impact of renewable energy fluctuations on the power grid, the overall system operation still lacks targeted and highly coupled coordinated control measures.

[0005] Currently, there is no systematic integrated solution that can organically integrate CCUS systems with wind, solar, and energy storage systems, achieving both efficient carbon dioxide capture and resource utilization, fully mobilizing the clean power supply of new energy sources, and synergistically optimizing the dynamic adjustment capabilities of energy and carbon flows to meet both grid connection and low-carbon emission requirements. Therefore, a new integrated system architecture is urgently needed to achieve deep synergy and efficient operation of CCUS and wind, solar, and energy storage systems. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a low-carbon green power generation system that couples CCUS with wind, solar and energy storage. By integrating wind and solar power generation, energy storage, water electrolysis for hydrogen production, carbon dioxide capture, compression storage and expansion power generation modules, it achieves the integrated goal of closed-loop regulation of energy and carbon emission reduction, improves system energy efficiency and operational stability, and solves the aforementioned problems.

[0007] This utility model provides the following technical solution:

[0008] A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage, comprising:

[0009] The wind and solar power generation module includes photovoltaic modules, wind turbines, step-up and conversion components, and grid connection interfaces, and is used to provide renewable energy power.

[0010] An energy storage module is connected to the wind and solar power generation module and is used to store surplus electrical energy; the wind and solar power generation module and the energy storage module constitute an independent new energy microgrid subsystem, which supports switching between grid-connected and off-grid operation modes.

[0011] The carbon capture module includes a flue gas inlet pipe, an absorption tower, an MEA solution storage tank, and a regeneration tower, and is used to absorb carbon dioxide from the flue gas;

[0012] The compression and storage module includes a four-stage compressor unit, an interstage heat exchanger, and a high-pressure CO2 storage tank, used to compress and store the carbon dioxide;

[0013] The expansion power generation module includes a heat exchanger, an expander, a generator, and a low-pressure CO2 storage tank. The expander is a turbine structure, and the output shaft of the expander is connected to the generator. The expansion power generation module heats up the carbon dioxide stored in the high-pressure CO2 storage tank to drive the expander, which in turn drives the generator to generate electricity. The released CO2 is stored in the low-pressure CO2 storage tank.

[0014] The water electrolysis hydrogen production module has one end electrically connected to the wind and solar power generation module, which uses surplus electricity to electrolyze water to generate hydrogen. The other end of the water electrolysis hydrogen production module is connected to the methanol synthesis module through a hydrogen supply pipeline to provide hydrogen raw materials for methanol synthesis. The regeneration tower is connected to the methanol synthesis module to provide CO2 raw materials for methanol synthesis.

[0015] The energy control module is used to coordinate the operation of the various modules, realize the dynamic adjustment of energy flow and the grid-connected output of the system.

[0016] Furthermore, the absorption tower and the regeneration tower are connected by a liquid circulation pipeline, and the high-concentration MEA solution enters the regeneration tower to release carbon dioxide after heat exchange between the lean and rich liquids.

[0017] Furthermore, an interstage heat exchanger is provided between each stage of the four-stage compressor unit of the compression storage module to reduce energy consumption during the compression process.

[0018] Furthermore, the high-pressure CO2 storage tank has a double-layer structure and is equipped with temperature and pressure sensors for real-time monitoring of the carbon dioxide storage status.

[0019] Furthermore, the expander in the expansion power generation module is a turbine structure, and its output shaft is connected to the generator.

[0020] Furthermore, the water electrolysis hydrogen production module adopts an alkaline water electrolysis structure or a proton exchange membrane (PEM) structure.

[0021] Furthermore, the energy storage module includes a lithium iron phosphate battery pack and is equipped with a bidirectional DC-DC converter connected to the wind and solar power generation module.

[0022] Furthermore, the system also includes an energy control module, which includes a PLC controller and a data acquisition component, and is communicatively connected to the operating status sensors of each module.

[0023] This utility model has the following beneficial technical effects:

[0024] This invention relates to a low-carbon green power generation system that couples CCUS with wind, solar and energy storage. It provides renewable energy through wind and solar power generation and stores surplus electricity using energy storage modules, thus solving the problems of intermittency and volatility of wind and solar energy and improving the stability and utilization rate of energy.

[0025] This invention's water electrolysis hydrogen production module dynamically adjusts the hydrogen production rate based on the surplus electricity from the wind and solar power generation module, effectively utilizing renewable energy and reducing the phenomenon of "wind and solar curtailment." By converting surplus electricity into hydrogen for storage, it improves the system's flexibility and stability, and enhances the utilization efficiency of renewable energy. This invention's system combines multi-stage compression and energy storage devices to achieve carbon dioxide capture, compression, storage, and reuse. It also achieves energy recovery and carbon resource conversion through high-pressure CO2 expansion power generation and methanol synthesis, respectively, solving the problems of uncoordinated energy flow, low energy efficiency, and difficulty in efficiently utilizing carbon resources in traditional carbon capture and power generation systems.

[0026] This invention's system achieves efficient energy utilization, carbon emission reduction and resource utilization, improved economic efficiency and operational stability, and enhanced synergy and flexibility of the energy structure through the deep coupling of multiple modules such as wind and solar power generation, energy storage, water electrolysis for hydrogen production, carbon capture, compression storage, and expansion power generation. It also has significant environmental friendliness and sustainability, providing a new solution for achieving low-carbon green power generation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the low-carbon green power generation system that couples CCUS with wind, solar and energy storage according to this utility model.

[0028] The attached figures are labeled as follows:

[0029] 1. Photovoltaic module; 2. Wind turbine; 3. Boost and conversion module; 4. Energy storage module; 5. Flue gas input pipeline; 6. Absorption tower; 7. MEA solution storage tank; 8. Regeneration tower; 9. Four-stage compressor unit; 10. Interstage heat exchanger; 11. High-pressure CO2 storage tank; 12. Heat exchanger; 13. Expander; 14. Generator; 15. Electrolysis water hydrogen production module; 16. Hydrogen supply pipeline; 17. Methanol synthesis module; 18. Energy management and control module; 19. Grid connection interface; 20. Low-pressure CO2 storage tank. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example

[0032] like Figure 1 As shown, a low-carbon green power generation system coupled with CCUS and wind, solar and energy storage includes a wind and solar power generation module, an energy storage module 4, a carbon capture module, a compressed storage module, an electrolysis water hydrogen production module 15, an expansion power generation module and an energy management and control module 18.

[0033] The wind and solar power generation module includes a photovoltaic module 1 and a wind turbine generator 2, and is equipped with boost chopper circuit, inverter and other boost and conversion components 3, so that the photovoltaic and wind power outputs are connected to the DC bus and connected to the power grid through the grid interface 19.

[0034] The energy storage module 4 includes a lithium iron phosphate battery pack, which is connected to the DC bus via a bidirectional DC-DC converter to achieve surplus energy storage and peak discharge regulation. The wind and solar power generation module and the energy storage module 4 constitute an independent new energy microgrid subsystem, supporting switching between grid-connected and off-grid operation modes.

[0035] The carbon capture module consists of a flue gas inlet pipe 5, an absorption tower 6, a high-concentration MEA solution storage tank 7, and a regeneration tower 8. Flue gas enters the absorption tower 6 through the flue gas inlet pipe 5 and reacts with the MEA solution to absorb CO2. High-purity carbon dioxide is then separated and recovered in the regeneration tower 8. The absorption tower 6 and the regeneration tower 8 are connected by a liquid circulation pipeline. The high-concentration MEA solution, after undergoing a lean-rich liquid heat exchange, enters the regeneration tower 8 to release carbon dioxide.

[0036] The compression and storage module employs a four-stage compressor unit 9, with interstage heat exchangers 10 between each stage to reduce energy consumption during the compression process. The captured CO2 is sequentially compressed to a high-pressure state and stored in a double-insulated high-pressure CO2 storage tank 11. The high-pressure CO2 storage tank 11 is also equipped with temperature and pressure sensors for real-time monitoring of the carbon dioxide storage status.

[0037] In this embodiment, the water electrolysis hydrogen production module 15 is an alkaline water electrolysis system that uses surplus electricity from the wind and solar power generation module to produce hydrogen, which is then sent to the methanol synthesis module 17 via the hydrogen supply pipeline 16.

[0038] In this embodiment, the regeneration tower 8 is connected to the methanol synthesis module 17, providing CO2 raw materials for methanol synthesis. The methanol synthesis module 17 uses hydrogen from the water electrolysis hydrogen production module 15 and CO2 provided by the regeneration tower 8 to synthesize methanol, which not only achieves efficient utilization of hydrogen, but also provides economic support for the carbon capture module, because methanol is a valuable chemical that can be sold as fuel or chemical feedstock.

[0039] The expansion power generation module includes a heat exchanger 12, an expander 13, a generator 14, and a low-pressure CO2 storage tank 20. The expander 13 in the expansion power generation module is a turbine structure, and its output shaft is connected to the generator 14. The expansion power generation module starts when the system's power consumption is at its peak or when wind and solar power output is insufficient. It releases high-pressure CO2 from the storage tank, which is heated by the heat exchanger 12 and then drives the expander 13 to drive the generator 14 to generate electricity. The released CO2 is stored in the low-pressure CO2 storage tank 20.

[0040] The energy management control module 18, based on a PLC controller and data acquisition components, collects the operating status of each module and communicates with the operating status sensors of each module to achieve dynamic coordination of power flow, heat flow, hydrogen flow and carbon flow, ensuring the stability of the system's closed-loop operation and grid-connected output.

[0041] This invention provides renewable energy power through a wind and solar power generation module and stores surplus electrical energy using an energy storage module, solving the problems of intermittency and fluctuation in wind and solar power. An electrolysis water-to-hydrogen module uses surplus electrical energy to produce hydrogen, which is then used in a methanol synthesis module to react with carbon dioxide provided by a carbon capture module to produce methanol, achieving resource utilization of carbon dioxide. Simultaneously, a compression storage module compresses and stores the captured carbon dioxide, while an expansion power generation module uses high-pressure carbon dioxide to generate electricity during peak electricity demand, further improving the system's energy efficiency. An energy control module coordinates the operation of each module, dynamically regulating energy flow and ensuring stable system operation. Through this deep coupling of multiple modules, this invention achieves efficient energy utilization, carbon emission reduction, and resource utilization, demonstrating significant environmental friendliness and sustainability.

[0042] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage, characterized in that, include: The wind and solar power generation module includes a photovoltaic module (1), a wind turbine (2), a step-up and conversion module (3), and a grid connection interface (19); Energy storage module (4), which is connected to the wind and solar power generation module; The carbon capture module includes a flue gas input pipe (5), an absorption tower (6), an MEA solution storage tank (7), and a regeneration tower (8); The compression and storage module includes a four-stage compressor unit (9), an interstage heat exchanger (10), and a high-pressure CO2 storage tank (11); The expansion power generation module includes a heat exchanger (12), an expander (13), a generator (14), and a low-pressure CO2 storage tank (20); The water electrolysis hydrogen production module (15) is electrically connected at one end to the wind and solar power generation module, and at the other end is connected to the methanol synthesis module (17) through the hydrogen supply pipeline (16). The methanol synthesis module (17) is also connected to the regeneration tower (8).

2. The low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage according to claim 1, characterized in that, The absorption tower (6) and the regeneration tower (8) are connected by a liquid circulation pipeline.

3. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage as described in claim 1, characterized in that, Interstage heat exchangers (10) are provided between each stage of the four-stage compressor unit (9) of the compression storage module.

4. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage as described in claim 1, characterized in that, The high-pressure CO2 storage tank (11) has a double-layer structure and is equipped with temperature and pressure sensors.

5. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage as described in claim 1, characterized in that, The expander (13) in the expansion power generation module is a turbine structure, and its output shaft is connected to the generator (14).

6. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage as described in claim 1, characterized in that, The water electrolysis hydrogen production module (15) adopts an alkaline water electrolysis structure or a proton exchange membrane (PEM) structure.

7. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage as described in claim 1, characterized in that, The energy storage module (4) includes a lithium iron phosphate battery pack and is equipped with a bidirectional DC-DC converter connected to the wind and solar power generation module.

8. A low-carbon green power generation system coupled with CCUS and wind, solar, and energy storage according to claim 1, characterized in that, The system also includes an energy management control module (18), which includes a PLC controller and a data acquisition component, and is communicatively connected to the operating status sensors of each module.

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