Carbon dioxide cycle energy comprehensive utilization system

Abstract

The utility model relates to the technical field of regional comprehensive energy utilization, and in particular to a carbon dioxide cycle energy comprehensive utilization system, including: a low-pressure storage tank for storing low-pressure liquid carbon dioxide; a compressor connected to the outlet of the low-pressure storage tank; a cooler arranged downstream of the compressor; a high-pressure storage tank arranged downstream of the cooler for storing high-pressure liquid carbon dioxide; an expander arranged downstream of the high-pressure storage tank, the expander is connected to a generator for generating electricity during the expansion of carbon dioxide, and the expanded low-pressure liquid carbon dioxide returns to the low-pressure storage tank; the cooler is connected to a water circulation flow path, and the cold water is used to cool the compressed carbon dioxide and generate hot water. The utility model is used to solve the defects of low efficiency or safety of the energy utilization system in the industrial park, and realize a safe and reliable energy efficient utilization plan.

Description

Technical Field

[0001] The utility model relates to the technical field of regional comprehensive energy utilization, in particular to a carbon dioxide circulation energy comprehensive utilization system. Background Art

[0002] Centralized industrial parks are an important industrial structure in my country's industrial production. The parks often cover multiple fields such as electronic information, material preparation, biotechnology, etc. The energy consumption is huge and the energy required is diverse, including electricity, heat, cold energy and steam.

[0003] The common industrial park combined cooling, heating and power system is based on natural gas combustion, heating water vapor to enter the turbine to generate electricity, using waste heat boilers to recover waste heat to supply heat energy to the outside, and further driving absorption refrigeration units to generate cold energy. However, this method has high energy costs, low overall energy utilization efficiency, and environmental pollution.

[0004] Energy storage systems in industrial parks can significantly reduce electricity costs through peak-valley price arbitrage. Chemical energy storage represented by lithium-ion batteries has been widely used, but the accompanying safety hazards and frequent combustion and explosion incidents are worrying, so there is an urgent need to find a safer and more reliable energy storage method. Utility Model Content

[0005] The utility model provides a carbon dioxide cycle energy comprehensive utilization system, which is used to solve the defects of low efficiency or safety of energy utilization systems in industrial parks and realize a safe and reliable energy efficient utilization solution.

[0006] The utility model provides a carbon dioxide circulation energy comprehensive utilization system, comprising: a low-pressure storage tank, which is used to store low-pressure liquid carbon dioxide; a compressor, which is connected to the outlet of the low-pressure storage tank; a cooler, which is arranged downstream of the compressor; a high-pressure storage tank, which is arranged downstream of the cooler, and is used to store high-pressure liquid carbon dioxide; an expander, which is arranged downstream of the high-pressure storage tank, and the expander is connected with a generator, which is used to generate electricity during the expansion of carbon dioxide, and the expanded low-pressure liquid carbon dioxide returns to the low-pressure storage tank; the cooler is connected to a water circulation flow path, and the cold capacity of cold water is used to cool down the compressed carbon dioxide and generate hot water.

[0007] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, the outlet of the low-pressure storage tank is provided with a first throttle valve; the outlet of the high-pressure storage tank is provided with a second throttle valve.

[0008] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, a radiator is arranged between the cooler and the high-pressure storage tank.

[0009] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, the carbon dioxide flow paths connected to the inlet and outlet of the low-pressure storage tank both flow through the cold storage device; the cold storage device is filled with cold storage medium.

[0010] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, a heater is arranged between the high-pressure storage tank and the expander; in the water circulation flow path, a hot water storage tank is arranged downstream of the cooler, and the hot water storage tank is connected to the heater to supply hot water to the heater; the carbon dioxide and hot water passing through the heater are heat exchanged and enter the expander.

[0011] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, the hot water storage tank is also connected to a flash evaporator, so that part of the hot water can be prepared into industrial steam through the flash evaporator.

[0012] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, a cold water storage tank is arranged upstream of the cooler in the water circulation flow path.

[0013] According to the utility model, a carbon dioxide circulation energy comprehensive utilization system includes a generator, an absorber, a condenser, a third throttle valve and an evaporator; the water circulation flow path downstream of the heater passes through the generator and enters the cold water storage tank, and the lithium bromide solution in the generator absorbs the waste heat of the water circulation flow path to vaporize the water in the lithium bromide solution into water vapor; wherein a solution loop and a steam loop are arranged between the generator and the absorber; in the steam loop, the water vapor generated by the generator passes through the condenser, the third throttle valve and the evaporator in sequence and enters the absorber; in the solution loop, the lithium bromide solution with increased concentration flows to the absorber, and after the concentration is reduced in the absorber, the lithium bromide solution flows to the generator.

[0014] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, the evaporator is connected with a chilled water generation flow path; the chilled water generation flow path exchanges heat with the steam circuit in the evaporator so that the chilled water generation flow path generates chilled water.

[0015] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, the solution loop is provided with a solution heat exchanger so that the lithium bromide solution with a higher concentration and the lithium bromide solution with a lower concentration can exchange heat in the solution heat exchanger; the solution outlet of the absorber is provided with a solution pump, and the solution inlet of the absorber is provided with a fourth throttle valve.

[0016] The carbon dioxide circulation energy comprehensive utilization system provided by the utility model realizes the recycling and energy conversion of carbon dioxide by constructing a closed-loop circuit including a low-pressure storage tank, a compressor, a cooler, a high-pressure storage tank and an expander, thereby realizing a safe and reliable energy efficient utilization solution. Specifically, the system extracts liquid carbon dioxide from a low-pressure storage tank, and after being pressurized by a compressor, it uses the water circulation flow path in the cooler to cool it down. It not only effectively utilizes the heat generated by the compression process to convert it into hot water, but also allows high-pressure liquid carbon dioxide to be stably stored. Subsequently, the high-pressure liquid expands and performs work in the expander, driving the generator to generate electricity. While completing energy recovery, the expanded low-pressure liquid carbon dioxide is circulated back to the storage tank, forming a reliable energy cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0018] Figure 1 This is a schematic diagram of the pipeline layout structure of the carbon dioxide cycle energy comprehensive utilization system provided by the utility model;

[0019] Reference numerals:

[0020] 1. Low-pressure storage tank; 2. First throttle valve; 3. Cold accumulator; 4. Compressor; 5. Cooler; 6. Radiator; 7. High-pressure storage tank; 8. Second throttle valve; 9. Heater; 10. Expander; 11. Cold water storage tank; 12. Hot water storage tank; 13. Flash evaporator; 14. Generator; 15. Condenser; 16. Third throttle valve; 17. Evaporator; 18. Absorber; 19. Solution pump; 20. Fourth throttle valve; 21. Solution heat exchanger; 22. Control unit. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0023] Combine the following Figure 1 The specific implementation method of the carbon dioxide circulation energy comprehensive utilization system of the utility model is described.

[0024] The utility model provides a carbon dioxide circulation energy comprehensive utilization system, comprising: a low-pressure storage tank 1, which is used to store low-pressure liquid carbon dioxide; a compressor 4, which is connected to the outlet of the low-pressure storage tank 1; a cooler 5, which is arranged downstream of the compressor 4; a high-pressure storage tank 7, which is arranged downstream of the cooler 5, and is used to store high-pressure liquid carbon dioxide; an expander 10, which is arranged downstream of the high-pressure storage tank 7, and the expander 10 is connected with a generator, which is used to generate electricity during the expansion of carbon dioxide, and the expanded low-pressure liquid carbon dioxide returns to the low-pressure storage tank 1; the cooler 5 is connected to a water circulation flow path, and the cold capacity of cold water is used to cool down the compressed carbon dioxide and generate hot water.

[0025] Specifically, the system is provided with a low-pressure storage tank 1 for containing liquid carbon dioxide in a low-pressure state. The compressor 4 connected to the outlet of the low-pressure storage tank 1 compresses the low-pressure carbon dioxide to a high-pressure state, and the electrical energy is converted into the potential energy and thermal energy of the carbon dioxide in this process. The cooler 5 located downstream of the compressor 4 absorbs a large amount of heat generated during the compression process by introducing a water circulation flow path and using the cold water's cold capacity. It not only effectively reduces the temperature of the compressed gas and avoids overheating damage to the equipment, but also converts this part of the heat energy into hot water, realizing the recycling of heat energy. The cooled high-pressure liquid carbon dioxide is then transferred to the high-pressure storage tank 7 for storage. Among them, the outside of the above-mentioned storage tank is preferably equipped with insulation material to ensure that the internal temperature is kept constant to prevent unnecessary gasification of carbon dioxide due to changes in external temperature, affecting the efficiency and safety of the system. The carbon dioxide in the high-pressure storage tank 7 is expanded and worked by the expander 10. The potential energy stored in this process is converted into kinetic energy, which in turn drives the connected generator to rotate and generate electricity. The generated electricity can be directly supplied to the park for use, or flexibly adjusted according to the needs of the power grid, and the peak-valley electricity price difference is used to maximize economic benefits. The liquid carbon dioxide that has returned to a low-pressure state after expansion returns to the low-pressure storage tank 1 through system design, ready to enter the next cycle. This not only realizes the recycling of carbon dioxide, but also achieves the closedness and high efficiency of the system in energy conversion.

[0026] The carbon dioxide cycle energy comprehensive utilization system can not only realize efficient energy storage and conversion through a highly integrated design, but also has the characteristics of small footprint, easy maintenance, and environmental friendliness, which is suitable for industrial parks with limited space and pursuing low-carbon development. In the best case, the system can be connected with distributed renewable energy (such as solar energy and wind energy) to further improve the green energy self-sufficiency rate of the park.

[0027] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, the outlet of the low-pressure storage tank 1 is provided with a first throttle valve 2; the outlet of the high-pressure storage tank 7 is provided with a second throttle valve 8. Among them, the first throttle valve 2 is located at the outlet of the low-pressure storage tank 1, and its main function is to finely adjust the flow rate of liquid carbon dioxide released from the low-pressure storage tank 1 to the inlet of the compressor 4, so as to avoid the compressor 4 being overloaded due to excessive flow or the system capacity being not fully utilized due to too small flow. The second throttle valve 8 is arranged at the outlet of the high-pressure storage tank 7, and its function is to play a role in pressure regulation during the carbon dioxide energy release (i.e., expansion power generation) stage. The second throttle valve 8 can maintain the pressure stability at the inlet of the expander 10 by controlling the release rate of high-pressure carbon dioxide. The presence of the two throttle valves ensures that in the entire carbon dioxide cycle energy comprehensive utilization system, whether it is the energy storage stage or the release stage, the pressure and flow can be accurately managed, thereby improving the overall stability and reliability of the system.

[0028] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, a radiator 6 is arranged between the cooler 5 and the high-pressure storage tank 7. The compressor 4 generates a large amount of heat energy when working. Although the cooler 5 has preliminarily recovered and utilized this part of heat to generate hot water, in order to convert the carbon dioxide into a high-pressure liquid form and store it safely for a long time, further cooling steps are required. The radiator 6 here undertakes the task of fine adjustment and enhanced cooling. It makes the carbon dioxide completely liquefied before entering the high-pressure storage tank 7 by increasing the heat exchange area or enhancing the heat exchange efficiency, ensuring that it is stored in liquid form.

[0029] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, the carbon dioxide flow paths connected to the inlet and outlet of the low-pressure storage tank 1 all flow through the cold storage device 3; the cold storage device 3 is filled with a cold storage medium. The cold storage device 3 is arranged in the carbon dioxide inlet and outlet flow paths of the low-pressure storage tank 1. Whether the carbon dioxide is output from the low-pressure storage tank 1 and is ready to enter the compression link, or returns to the low-pressure storage tank 1 for storage after expansion and power generation, it must pass through the cold storage device 3 to achieve heat exchange with the cold storage medium.

[0030] Among them, when the low-pressure liquid carbon dioxide is output from the storage tank and passes through the cold storage device 3, the cold it carries is transferred to the cold storage medium. After the expansion and power generation, the temperature of the gaseous carbon dioxide decreases. When it passes through the cold storage device 3 again, the cold storage medium releases the cold stored before, cools the carbon dioxide, and reliquefies it. This process not only ensures that the carbon dioxide can be stored in the low-pressure storage tank 1 in an efficient and energy-saving manner, but also avoids dependence on external cooling resources, thereby improving the self-sufficiency and overall cycle efficiency of the system. The cold storage medium filled in the cold storage device 3 can be a solid-liquid phase change material with high heat storage density. This type of material can absorb or release a large amount of heat energy during the phase change process; another option is an efficient solid cold storage material, which usually has good thermal conductivity and long-term stability, and can work efficiently in a wide temperature range. By integrating the cold storage device 3 in the comprehensive utilization system of carbon dioxide cycle energy and rationally utilizing the characteristics of the cold storage medium, the system realizes the effective storage and reuse of cold.

[0031] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, a heater 9 is provided between the high-pressure storage tank 7 and the expander 10; a hot water storage tank 12 is provided downstream of the cooler 5 on the water circulation flow path, and the hot water storage tank 12 is connected to the heater 9 to supply hot water to the heater 9; the carbon dioxide passing through the heater 9 exchanges heat with the hot water and enters the expander 10. The introduction of the heater 9 and the hot water storage tank 12 further improves the energy recovery and utilization efficiency of the system.

[0032] Specifically, when high-pressure liquid carbon dioxide passes through the heater 9, it is heated by hot water to vaporize and further heat up. This heating process not only ensures that the carbon dioxide reaches an ideal working state before entering the expander 10, improving the expansion efficiency, but also enhances the work capacity of the expander 10, that is, increases the power generation. In the water circulation flow path, the hot water storage tank 12 downstream of the cooler 5 is responsible for collecting and storing the hot water generated in the process of cooling the compressed gas. The entire system forms a closed-loop heat energy recycling system through the coordinated operation of the cooler 5, the hot water storage tank 12 and the heater 9. The cooler 5 absorbs the compression heat energy and converts it into hot water storage. The hot water storage tank 12 stores this heat energy as an intermediary. The heater 9 then feeds this heat energy back to the system for heating the high-pressure liquid carbon dioxide and promoting the efficient operation of the expander 10.

[0033] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, the hot water storage tank 12 is also connected to a flash evaporator 13, so that part of the hot water can be prepared into industrial steam through the flash evaporator 13. The flash evaporator 13 uses the thermal energy of the high-temperature hot water in the hot water storage tank 12 to quickly evaporate part of the water in the hot water to form steam by reducing the pressure. This process does not require additional heat source input, but efficiently utilizes existing thermal energy resources. The steam produced by the flash evaporator 13 can be directly used for industrial production needs within the park, such as heating, process heating, steam turbine power generation, etc., to replace or supplement traditional steam supply methods. Through the integrated application of the flash evaporator 13, the carbon dioxide circulation energy comprehensive utilization system of the utility model realizes multi-level energy conversion and utilization from electrical energy to thermal energy and then to steam energy, forming a more complete and efficient energy circulation system.

[0034] According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, a cold water storage tank 11 is provided upstream of the cooler 5 in the water circulation flow path. The cold water storage tank 11 is mainly used to store low-temperature water, which will be transported to the cooler 5 in the water circulation system to absorb a large amount of heat generated during the compression process. The cold water storage tank 11 ensures a stable supply of low-temperature water.

[0035] According to the utility model, a carbon dioxide circulation energy comprehensive utilization system includes a generator 14, an absorber 18, a condenser 15, a third throttle valve 16 and an evaporator 17; the water circulation flow path downstream of the heater 9 enters the cold water storage tank 11 through the generator 14, and the lithium bromide solution in the generator 14 absorbs the waste heat of the water circulation flow path to vaporize the water in the lithium bromide solution into water vapor; wherein a solution loop and a steam loop are arranged between the generator 14 and the absorber 18; in the steam loop, the water vapor generated by the generator 14 passes through the condenser 15, the third throttle valve 16 and the evaporator 17 in sequence and enters the absorber 18; in the solution loop, the lithium bromide solution with increased concentration flows to the absorber 18, and after the concentration is reduced in the absorber 18, the lithium bromide solution flows to the generator 14.

[0036] The generator 14 can extract waste heat from the water circulation path downstream of the heater 9. The waste heat is introduced into the generator 14 and used to heat the lithium bromide solution. In the generator 14, the water in the solution is continuously vaporized into water vapor due to the absorption of heat energy, and at the same time, the concentration of the lithium bromide solution gradually increases. As the water continues to vaporize, the high-concentration lithium bromide solution is then sent back to the absorber 18, forming a closed solution loop.

[0037] The water vapor generated by the generator 14 moves along the steam loop and first enters the condenser 15. Then, the liquid water formed in the condenser 15 passes through the third throttle valve 16. The throttle valve quickly reduces the pressure, causing the liquid water to expand rapidly under the condition of sudden pressure reduction and partially vaporize again, turning into low-temperature and low-pressure steam. Then, this part of the steam enters the evaporator 17. Then, the vaporized water vapor is sent back to the absorber 18, where it is reabsorbed by the lithium bromide solution with increased concentration. In the absorber 18, the lithium bromide solution continuously absorbs water vapor, and its concentration decreases accordingly. The adjusted low-concentration lithium bromide solution flows to the generator 14 again through the solution loop to prepare for the heat absorption process of the next cycle.

[0038] Preferably, the evaporator 17 not only participates in the conversion process of thermal energy, but is also directly related to the production of chilled water, thereby providing the required cooling capacity for the park. According to a carbon dioxide cycle energy comprehensive utilization system provided by the utility model, the evaporator 17 is connected to a chilled water generation flow path; the chilled water generation flow path and the steam circuit exchange heat in the evaporator 17, so that the chilled water generation flow path generates chilled water. Two independent but interacting flow path systems are designed inside the evaporator 17 - the steam circuit and the chilled water generation flow path. The room temperature water in the chilled water generation flow path flows through a specific heat exchange area inside the evaporator 17. The heat of the room temperature water in the chilled water generation flow path is absorbed by the medium in the steam circuit, so that the chilled water generation flow path outputs chilled water.

[0039] According to a carbon dioxide circulation energy comprehensive utilization system provided by the utility model, a solution circuit is provided with a solution heat exchanger 21, so that a lithium bromide solution with a higher concentration exchanges heat with a lithium bromide solution with a lower concentration in the solution heat exchanger 21; a solution pump 19 is provided at the solution outlet of the absorber 18, and a fourth throttle valve 20 is provided at the solution inlet of the absorber 18. The solution circuit realizes the effective transfer and utilization of heat energy through the circulation of lithium bromide solution, thereby improving the efficiency of chilled water generation. The main function of the solution heat exchanger 21 is to allow lithium bromide solutions from different links to flow through and exchange heat with each other.

[0040] Specifically, the lithium bromide solution with a higher concentration (i.e., a concentrated solution) flows out of the generator 14, carrying the heat absorbed from the evaporator 17, while the lithium bromide solution that is diluted in the absorber 18 to become a lower concentration (i.e., a dilute solution) has a relatively low temperature. The two solutions are not directly mixed inside the solution heat exchanger 21, but heat is transferred through the tube wall, so that the concentrated solution releases heat to the dilute solution that is about to enter the generator 14. In this way, the concentrated solution is pre-cooled before entering the generator 14, and the dilute solution is preheated. The solution pump 19 is installed at the solution outlet of the absorber 18 to provide flow power for the solution circuit. The fourth throttle valve 20 is arranged at the solution inlet of the absorber 18, and its function is to throttle and reduce the pressure of the concentrated solution coming from the generator 14.

[0041] The utility model provides a highly integrated and optimized carbon dioxide cycle energy comprehensive utilization system, which preferably realizes the comprehensive supply and efficient management of industrial or park-level cold, heat, electricity, and steam demand through intelligent control and multi-energy conversion technology. The system can make full use of the off-peak period of the power grid and drive the compressor 4 to store carbon dioxide energy at an economical electricity price or waste electricity. When the power consumption reaches the peak, the stored carbon dioxide releases energy through the expansion process to drive the generator to generate electricity. The waste heat generated in this process is not wasted, but is effectively recovered to drive the absorption refrigeration unit (including the generator 14, the absorber 18, the condenser 15, the third throttle valve 16, the evaporator 17 and the chilled water generation process), and to produce steam through the flash evaporator 13 to supply the steam demand, thereby realizing the cascade utilization of energy.

[0042] like Figure 1 As shown, the system can set up a control unit 22 as an intelligent brain, which is responsible for collecting and analyzing the factory's specific demand instructions for cooling, heating, electricity, and steam, and dynamically adjusting the operation strategy of the entire system based on these real-time data to ensure that all parts work together to achieve optimal efficiency.

[0043] In order to adapt to different working conditions and energy efficiency requirements, the compressor 4 and expander 10 in the system are flexibly designed, which can be configured not only as a single stage but also as a multi-stage mode, matched with the deployment of multi-stage coolers 5 and heaters 9, which greatly enhances the system's processing capacity and energy efficiency. Various heat exchange devices are selected according to actual needs, such as shell and tube type, plate type or fin type, to ensure maximum heat exchange efficiency.

[0044] The carbon dioxide cycle energy comprehensive utilization system can not only realize the energy storage and power generation of liquid carbon dioxide, but also simultaneously supply the cooling, heat and steam required by the park, truly achieving diversified energy supply and efficient conversion. The intelligent regulation of the control unit 22 ensures seamless connection between various links and optimal resource allocation, significantly improves the overall energy utilization efficiency, reduces dependence on traditional waste heat boilers, protects the environment, and brings significant economic benefits, demonstrating the concept of green, low-carbon and sustainable development.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A carbon dioxide cycle energy comprehensive utilization system, characterized in that: include: A low-pressure storage tank (1) for storing low-pressure liquid carbon dioxide; A compressor (4) connected to the outlet of the low-pressure storage tank (1); A cooler (5) is arranged downstream of the compressor (4); a high-pressure storage tank (7), arranged downstream of the cooler (5), for storing high-pressure liquid carbon dioxide; an expander (10) disposed downstream of the high-pressure storage tank (7), the expander (10) being connected to a generator for generating electricity during the expansion of the carbon dioxide, and the expanded low-pressure liquid carbon dioxide returning to the low-pressure storage tank (1); The cooler (5) is connected to a water circulation path, and uses the cold water to cool the compressed carbon dioxide and generate hot water.

2. The carbon dioxide cycle energy comprehensive utilization system according to claim 1 is characterized in that: The outlet of the low-pressure storage tank (1) is provided with a first throttle valve (2); the outlet of the high-pressure storage tank (7) is provided with a second throttle valve (8).

3. The carbon dioxide cycle energy comprehensive utilization system according to claim 1 is characterized in that: A radiator (6) is provided between the cooler (5) and the high-pressure storage tank (7).

4. The carbon dioxide cycle energy comprehensive utilization system according to claim 1 is characterized in that: The carbon dioxide flow paths connected to the inlet and outlet of the low-pressure storage tank (1) both flow through the cold storage device (3); The cold storage device (3) is filled with a cold storage medium.

5. The carbon dioxide cycle energy comprehensive utilization system according to any one of claims 1 to 4, characterized in that: A heater (9) is provided between the high-pressure storage tank (7) and the expander (10); A hot water storage tank (12) is provided downstream of the cooler (5) on the water circulation flow path, and the hot water storage tank (12) is connected to the heater (9) to supply hot water to the heater (9); The carbon dioxide passes through the heater (9) and then exchanges heat with hot water before entering the expander (10).

6. The carbon dioxide cycle energy comprehensive utilization system according to claim 5 is characterized in that: The hot water storage tank (12) is also connected to a flash evaporator (13) so that part of the hot water can be prepared into industrial steam through the flash evaporator (13).

7. The carbon dioxide cycle energy comprehensive utilization system according to claim 5 is characterized in that: In the water circulation flow path, a cold water storage tank (11) is provided upstream of the cooler (5).

8. The carbon dioxide cycle energy comprehensive utilization system according to claim 7 is characterized in that: It comprises a generator (14), an absorber (18), a condenser (15), a third throttle valve (16) and an evaporator (17); The water circulation path downstream of the heater (9) passes through the generator (14) and enters the cold water storage tank (11), and the lithium bromide solution in the generator (14) absorbs the waste heat of the water circulation path, so that the water in the lithium bromide solution is vaporized into water vapor; Wherein, a solution loop and a steam loop are provided between the generator (14) and the absorber (18); In the steam circuit, the water vapor generated by the generator (14) passes through the condenser (15), the third throttle valve (16) and the evaporator (17) in sequence and enters the absorber (18); In the solution loop, the lithium bromide solution with increased concentration flows to the absorber (18), and after the concentration is reduced in the absorber (18), the lithium bromide solution flows to the generator (14).

9. The carbon dioxide cycle energy comprehensive utilization system according to claim 8, characterized in that: The evaporator (17) is connected with a chilled water generation flow path; The chilled water generating flow path exchanges heat with the steam circuit in the evaporator (17), so that the chilled water generating flow path generates chilled water.

10. The carbon dioxide cycle energy comprehensive utilization system according to claim 8, characterized in that: The solution circuit is provided with a solution heat exchanger (21) so that the lithium bromide solution with a higher concentration and the lithium bromide solution with a lower concentration can exchange heat in the solution heat exchanger (21); The solution outlet of the absorber (18) is provided with a solution pump (19), and the solution inlet of the absorber (18) is provided with a fourth throttle valve (20).

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