Carbon recovery dry ice preparation system based on phase change trapping
By designing a carbon recovery dry ice preparation system based on phase change capture, and utilizing components such as centrifugal compressors, heat exchangers, and turbine expanders, the problem of carbon dioxide capture and utilization in thermal power plants was solved, achieving efficient dry ice preparation and improved energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QICHENG SUSPENSION TECHNOLOGY (NANTONG) CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-05-15
AI Technical Summary
How to efficiently capture and utilize carbon dioxide emissions from thermal power plants, reduce carbon emissions, and promote the sustainable development of renewable energy.
A carbon recovery dry ice preparation system based on phase change capture is designed. Through the coordinated operation of components such as centrifugal compressor, heat exchanger, turbine expander and Dewar jar, carbon dioxide is efficiently captured, cooled and solidified to form a closed loop, producing dry ice and improving energy utilization.
It achieves efficient capture and recycling of carbon dioxide emitted from thermal power plants, produces dry ice with a wide range of applications, improves energy efficiency, meets environmental protection and energy conservation requirements, and supports the achievement of carbon emission reduction targets.
Smart Images
Figure CN224246479U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of energy utilization technology, and in particular relates to a carbon recovery dry ice preparation system based on phase change trapping. Background Technology
[0002] Thermal power plants play a crucial role in heating and power generation, producing high-temperature, high-pressure steam from fuel combustion to drive generators and generate electricity, while also utilizing waste heat for heating. However, the exhaust steam emitted contains a high level of carbon dioxide, making it a significant source of carbon emissions.
[0003] Reducing CO2 emissions from thermal power plants and promoting the sustainable development of renewable energy have become core tasks in the global fight against climate change. This not only helps achieve a green and low-carbon transition but also plays a vital role in building a clean energy system. Currently, how to efficiently capture and utilize carbon dioxide emissions from thermal power plants is a pressing technical challenge that needs to be addressed. Utility Model Content
[0004] To address the aforementioned technical problems, this invention proposes a carbon recovery dry ice preparation system based on phase change trapping.
[0005] To achieve the above objectives, this utility model provides a carbon recovery dry ice preparation system based on phase change trapping, comprising: a first gas storage tank for storing carbon dioxide gas, the first gas storage tank being connected to a centrifugal compressor, the centrifugal compressor being connected to a first heat exchanger, the gas flow passing through the first heat exchanger and then being connected to a second gas storage tank, the outlet pipe of the second gas storage tank being divided into two branches, one branch being connected to a turbine expander, and the other branch being connected to the second heat exchanger, the gas flow processed by the turbine expander also entering the second heat exchanger, exchanging heat with the gas flow entering the second heat exchanger from the second gas storage tank, so that the gas flow entering the second heat exchanger from the second gas storage tank is cooled and then enters a throttling valve, and then enters a Dewar canister after passing through the throttling valve; the gas flow entering the second heat exchanger from the turbine expander after heat exchange flows into the first gas storage tank.
[0006] Preferably, the Dewar canister is connected to the first heat exchanger. Carbon dioxide gas that enters the Dewar canister but does not transform into dry ice enters the first heat exchanger and exchanges heat with the gas entering the first heat exchanger from the centrifugal compressor.
[0007] Preferably, the gas entering the first heat exchanger from the Dewar canister flows back to the first gas storage tank through a pipeline after heat exchange.
[0008] Preferably, a first ball valve and a first electro-proportional valve are connected on the branch between the second gas storage tank and the turbine expander.
[0009] Preferably, a second ball valve and a second electro-proportional valve are connected to the branch between the second gas storage tank and the second heat exchanger.
[0010] Preferably, a cryogenic adsorption dryer is also connected between the first electro-proportional valve and the turbine expander.
[0011] Preferably, both the centrifugal compressor and the turbine expander employ air suspension bearing technology.
[0012] Preferably, the gas entering the first gas storage tank is high-purity carbon dioxide gas obtained through a purification process.
[0013] Compared with the prior art, the present invention has the following advantages and technical effects:
[0014] This invention, through the coordinated operation of its components, forms a highly efficient carbon dioxide dry ice preparation cycle system with significant advantages and technical effects. Specifically, the centrifugal compressor increases the pressure of the carbon dioxide gas, creating conditions for subsequent processing; the first heat exchanger performs initial heat exchange and cooling on the compressed gas, improving energy utilization efficiency; the second storage tank features a split design, with one path passing through a turbine expander for expansion refrigeration technology for cooling, and the other path directly entering the second heat exchanger to exchange heat with the low-temperature gas at the turbine expander outlet, achieving a second cooling. Combined with the throttling effect of the expansion valve, the temperature of the carbon dioxide gas can be reduced to the phase change temperature, thereby efficiently preparing dry ice in the Dewar flask; the carbon dioxide gas that has not undergone phase change to dry ice flows back to the first storage tank after heat exchange in the first heat exchanger, forming a closed loop and avoiding the waste of high-purity carbon dioxide. This structure not only achieves efficient capture and recycling of carbon dioxide from exhaust gas from thermal power plants, converting it into dry ice with a wide range of applications, such as industrial refrigeration and food preservation, but also significantly improves energy efficiency through heat recycling. It provides important technical support for achieving carbon emission reduction targets and developing a circular economy, and has multiple advantages such as high efficiency, energy saving, and environmental protection. Attached Figure Description
[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0016] Figure 1 This is a schematic diagram of a carbon recovery dry ice preparation system based on phase change trapping according to this utility model.
[0017] In the diagram: 1. First gas storage tank; 2. Centrifugal compressor; 3. First heat exchanger; 4. Second gas storage tank; 5. First ball valve; 6. First electro-proportional valve; 7. Refrigerated adsorption dryer; 8. Turbine expander; 9. Dewar jar; 10. Throttling valve; 11. Second heat exchanger; 12. Second electro-proportional valve; 13. Second ball valve. Detailed Implementation
[0018] 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.
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] Reference Figure 1 As shown, this embodiment provides a carbon recovery dry ice preparation system based on phase change trapping, including: a first gas storage tank 1 for storing carbon dioxide gas, the first gas storage tank 1 is connected to a centrifugal compressor 2, the centrifugal compressor 2 is connected to a first heat exchanger 3, the gas flow after heat exchange in the first heat exchanger 3 is connected to a second gas storage tank 4, the gas outlet pipe of the second gas storage tank 4 is divided into two branches, one branch is connected to a turbine expander 8, and the other branch is connected to a second heat exchanger 11. The gas flow after being processed by the turbine expander 8 also enters the second heat exchanger 11 and exchanges heat with the gas flow entering the second heat exchanger 11 from the second gas storage tank 4, so that the gas flow entering the second heat exchanger 11 from the second gas storage tank 4 is cooled and then enters a throttling valve 10, and then enters a Dewar canister 9 after passing through the throttling valve 10; the gas flow entering the second heat exchanger 11 from the turbine expander 8 after heat exchange flows into the first gas storage tank 1.
[0021] This invention, through the coordinated operation of its components, forms a highly efficient carbon dioxide dry ice preparation cycle system with significant advantages and technical effects. Specifically, the centrifugal compressor 2 increases the pressure of the carbon dioxide gas, creating conditions for subsequent processing; the first heat exchanger 3 performs initial heat exchange and cooling on the compressed gas, improving energy utilization efficiency; the second gas storage tank 4 is designed with a split-flow system, one path passing through the turbine expander 8 for expansion refrigeration technology for cooling, and the other path directly entering the second heat exchanger 11 to exchange heat with the low-temperature gas at the outlet of the turbine expander 8, achieving a second cooling. Combined with the throttling effect of the throttling valve 10, the temperature of the carbon dioxide gas can be reduced to the phase change temperature, thereby efficiently preparing dry ice in the Dewar jar 9; the carbon dioxide gas that has not undergone phase change to dry ice flows back to the first gas storage tank 1 after heat exchange in the first heat exchanger 3, forming a closed loop and avoiding the waste of high-purity carbon dioxide. This structure not only achieves efficient capture and recycling of carbon dioxide from exhaust gas from thermal power plants, converting it into dry ice with a wide range of applications, such as industrial refrigeration and food preservation, but also significantly improves energy efficiency through heat recycling. It provides important technical support for achieving carbon emission reduction targets and developing a circular economy, and has multiple advantages such as high efficiency, energy saving, and environmental protection.
[0022] In a further optimized scheme, the Dewar jar 9 is connected to the first heat exchanger 3. Carbon dioxide gas that enters the Dewar jar 9 but does not transform into dry ice enters the first heat exchanger 3 and exchanges heat with the gas entering the first heat exchanger 3 from the centrifugal compressor 2.
[0023] The Dewar jar 9 is connected to the first heat exchanger 3, allowing the carbon dioxide gas that has not yet undergone phase change to dry ice to enter the first heat exchanger 3 and exchange heat with the gas discharged from the centrifugal compressor 2. This design realizes the recovery and utilization of the cold energy of the low-temperature gas. By utilizing the low-temperature characteristics of the carbon dioxide gas that has not undergone phase change to pre-cool the high-temperature gas after compression, the energy loss in the subsequent heat exchange process is reduced, and the heat exchange efficiency of the system is improved. This structure significantly improves the economy, environmental protection and operating efficiency of the entire dry ice preparation system through energy recycling and efficient material recovery, providing a better technical path for carbon capture and resource utilization.
[0024] The scheme was further optimized so that the gas entering the first heat exchanger 3 from the Dewar 9 flows back to the first gas storage tank 1 through pipeline after heat exchange.
[0025] The gas entering the first heat exchanger 3 from the Dewar jar 9 flows back to the first gas storage tank 1 through pipelines after heat exchange. This design constructs a complete closed-loop system, which allows the carbon dioxide gas that has not been converted into dry ice to be recovered and reused, avoiding the waste of high-purity carbon dioxide and significantly improving the utilization rate of raw materials. In addition, this loop design reduces gas emissions, meets the needs of carbon recovery and energy conservation and emission reduction, and provides a guarantee for the continuous and stable operation and low-carbon operation of the system, further enhancing the economy, environmental protection and technical feasibility of the dry ice preparation system.
[0026] The scheme is further optimized by connecting a first ball valve 5 and a first electric proportional valve 6 on the branch between the second gas storage tank 4 and the turbine expander 8.
[0027] The first ball valve 5 can precisely control the on / off state of this branch, enabling flexible adjustment of the gas flow direction and facilitating system start-up, shutdown, and switching of operating states. The first electro-proportional valve 6 can precisely adjust the opening degree through current signals, thereby controlling the pressure and flow rate of carbon dioxide gas in this branch in real time. This allows the gas parameters (pressure and flow rate) entering the turbine expander 8 to be precisely adjusted according to actual operating requirements, ensuring that the turbine expander 8 operates under high-efficiency conditions, improving the expansion and refrigeration effect and the overall stability of the system. The combined use of these two valves achieves precise control of gas flow and pressure, enhancing the operational flexibility and adaptability of the system. Operating parameters can be optimized according to different operating conditions, improving dry ice preparation efficiency and system reliability, and providing technical support for the precise and intelligent control of the entire dry ice preparation system.
[0028] In a further optimized design, a second ball valve 13 and a second electro-proportional valve 12 are connected to the branch between the second gas storage tank 4 and the second heat exchanger 11.
[0029] The second ball valve 13 can flexibly control the opening and closing of this branch, facilitating process switching and operational status adjustment under different operating conditions. The second electro-proportional valve 12 can precisely adjust the opening degree through current signals, thereby controlling the pressure and flow rate of carbon dioxide gas in this branch in real time. This allows the gas parameters entering the second heat exchanger 11 to be precisely adjusted according to actual needs, ensuring that the gas pressure entering the throttle valve 10 meets the phase change requirements. The combined use of these two valves achieves refined control of gas flow rate and pressure, enhancing the system's adaptability to different operating stages. Parameters can be optimized in a timely manner based on pressure and temperature changes during the dry ice preparation process, ensuring stable and efficient system operation. Furthermore, it provides technical support for the automated control and energy-saving operation of the entire dry ice preparation system.
[0030] In a further optimized design, a freeze adsorption dryer 7 is connected between the first electric proportional valve 6 and the turbine expander 8.
[0031] A cryogenic adsorption dryer 7 is connected between the first electric proportional valve 6 and the turbine expander 8. This design further removes gaseous and liquid water from the carbon dioxide gas in the pipeline, preventing moisture from condensing into ice and clogging the pipeline or corroding equipment such as the turbine expander 8 at low temperatures, thus ensuring unobstructed pipeline flow and safe and stable equipment operation. Simultaneously, the dried, high-purity carbon dioxide gas enters the turbine expander 8, improving expansion and refrigeration efficiency and preventing moisture from affecting gas expansion performance and the purity of dry ice preparation, ensuring the quality of dry ice products. Furthermore, the cryogenic adsorption dryer 7 enhances the system's ability to handle gaseous impurities, reduces the risk of equipment failure due to residual moisture, extends the system's service life, and provides a guarantee for the efficient, reliable, and continuous operation of the dry ice preparation process, further improving the practicality and stability of the entire carbon recovery dry ice preparation system.
[0032] The design was further optimized so that both the centrifugal compressor 2 and the turbo expander 8 adopted air suspension bearing technology.
[0033] This technology enables completely oil-free operation of the equipment, avoiding contamination of carbon dioxide gas by lubricating oil, ensuring the purity of the dry ice preparation process and product quality, while eliminating the oil stain treatment process and reducing system maintenance costs. The air suspension bearing features a long lifespan and wide temperature range, adapting to high and low temperature conditions during dry ice preparation, ensuring long-term stable operation of the equipment and reducing downtime for maintenance. Its low noise characteristics reduce noise pollution during system operation, meeting environmental protection requirements. Furthermore, the air suspension bearing's robustness allows it to maintain stable mechanical performance under complex operating conditions, improving the operating efficiency and reliability of the centrifugal compressor 2 and the turbine expander 8, providing key technical support for the efficient, environmentally friendly, and long-cycle operation of the entire dry ice preparation system.
[0034] The scheme was further optimized so that the gas entering the first gas storage tank 1 was high-purity carbon dioxide gas obtained through a purification process.
[0035] High-purity carbon dioxide gas provides a high-quality raw material for dry ice preparation, effectively improving the purity and quality of dry ice products and meeting the application needs of various fields such as industrial refrigeration and food preservation. It avoids problems such as equipment corrosion and pipeline blockage caused by the circulation of impurity gases within the system, reducing the risk of system failure and extending the service life of equipment. At the same time, the use of high-purity carbon dioxide gas can improve the phase change capture efficiency, enabling more carbon dioxide gas to be converted into dry ice, thereby increasing the production capacity and economic benefits of the dry ice preparation system. In addition, this design ensures the efficient operation of the system from the raw material end, providing an important guarantee for the reliability, stability and product quality of the entire carbon recovery dry ice preparation system.
[0036] The working process of this utility model is as follows: First, high-purity carbon dioxide gas obtained through purification process enters the first gas storage tank 1 for storage. Then, it is compressed by centrifugal compressor 2 to increase the pressure. The compressed high-temperature gas enters the first heat exchanger 3, where it exchanges heat with the low-temperature, un-phase-change carbon dioxide gas discharged from Dewar jar 9 to cool it down. After that, it flows into the second gas storage tank 4 for temporary storage. The gas outlet pipeline of the second gas storage tank 4 is divided into two branches: one branch passes through the first ball valve 5, the first electro-proportional valve 6, and the refrigerated adsorption dryer 7 to remove moisture from the gas, and then enters the turbine expander 8. The expansion refrigeration technology is used to reduce the pressure and temperature of the gas to form a low-temperature gas flow. The other branch passes through the second ball valve 13 and the second electro-proportional valve 12 and then directly enters the second heat exchanger 11. The two gas flows exchange heat in the second heat exchanger 11. The low-temperature gas flow discharged from the turbine expander 8 is used to cool the high-pressure gas flow of the other branch. The cooled high-pressure gas flow enters the throttling valve 10, where the temperature is further reduced to the phase change temperature due to the throttling effect, causing some of the carbon dioxide gas to be converted into dry ice and stored in Dewar jar 9. The gas flow from the turbine expander 8, after heat exchange, and the carbon dioxide gas in the Dewar jar 9 that has not yet transformed into dry ice, return to the first heat exchanger 3 through pipelines. There, they exchange heat with the high-temperature gas discharged from the centrifugal compressor 2 before flowing back to the first gas storage tank 1, forming a closed loop. This ensures that high-purity carbon dioxide gas continuously participates in the dry ice preparation process, avoiding waste. The entire process, through the coordinated operation of various components, achieves efficient capture, cooling, and solidification of carbon dioxide in the exhaust gas of thermal power plants, ultimately producing dry ice and improving energy utilization.
[0037] Any aspects of this utility model that are not detailed herein are conventional technical means known to those skilled in the art.
[0038] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. A carbon recovery dry ice preparation system based on phase change trapping, characterized in that, include: A first gas storage tank (1) for storing carbon dioxide gas is connected to a centrifugal compressor (2). The centrifugal compressor (2) is connected to a first heat exchanger (3). After the airflow is heated by the first heat exchanger (3), it is connected to a second gas storage tank (4). The outlet pipe of the second gas storage tank (4) is divided into two branches. One branch is connected to a turbo expander (8), and the other branch is connected to a second heat exchanger (11). The airflow processed by the turbo expander (8) also enters the second heat exchanger (11) and exchanges heat with the airflow entering the second heat exchanger (11) from the second gas storage tank (4). This causes the airflow entering the second heat exchanger (11) from the second gas storage tank (4) to be cooled and then enters a throttle valve (10). After passing through the throttle valve (10), it enters a Dewar canister (9). The airflow entering the second heat exchanger (11) from the turbo expander (8) after heat exchange flows into the first gas storage tank (1).
2. The carbon recovery dry ice preparation system based on phase change trapping according to claim 1, characterized in that: The Dewar jar (9) is connected to the first heat exchanger (3). Carbon dioxide gas that enters the Dewar jar (9) but does not change into dry ice enters the first heat exchanger (3) and exchanges heat with the gas that enters the first heat exchanger (3) from the centrifugal compressor (2).
3. The carbon recovery dry ice preparation system based on phase change trapping according to claim 2, characterized in that: The gas entering the first heat exchanger (3) from the Dewar jar (9) flows back to the first gas storage tank (1) through pipeline after heat exchange.
4. The carbon recovery dry ice preparation system based on phase change trapping according to claim 1, characterized in that: A first ball valve (5) and a first electric proportional valve (6) are connected on the branch between the second gas storage tank (4) and the turbine expander (8).
5. The carbon recovery dry ice preparation system based on phase change trapping according to claim 1, characterized in that: A second ball valve (13) and a second electro-proportional valve (12) are connected to the branch between the second gas storage tank (4) and the second heat exchanger (11).
6. The carbon recovery dry ice preparation system based on phase change trapping according to claim 4, characterized in that: A freeze adsorption dryer (7) is also connected between the first electric proportional valve (6) and the turbine expander (8).
7. The carbon recovery dry ice preparation system based on phase change trapping according to claim 1, characterized in that: Both the centrifugal compressor (2) and the turbine expander (8) adopt air suspension bearing technology.
8. The carbon recovery dry ice preparation system based on phase change trapping according to claim 1, characterized in that: The gas entering the first gas storage tank (1) is high-purity carbon dioxide gas obtained through a purification process.