Carbon dioxide energy storage system without gas bin

Abstract

The utility model relates to the technical field of carbon dioxide energy storage, in particular to a carbon dioxide energy storage system without a gas bin. The energy storage system comprises a first storage tank, a second storage tank, a first heat exchange assembly, a second heat exchange assembly, a compressor and a turbine, the first storage tank is connected with the first heat exchange assembly and the second heat exchange assembly, the second storage tank is connected with the compressor and the turbine, the first heat exchange assembly is connected with the turbine, and the second heat exchange assembly is connected with the compressor. Electricity from new energy or electricity of a power grid drives a compressor to work, carbon dioxide gas adsorbed in a second storage tank is compressed by the compressor and releases heat by a second heat exchange assembly to form carbon dioxide liquid, and the carbon dioxide liquid enters a first storage tank; during energy release, carbon dioxide gas is obtained after the carbon dioxide liquid in the first storage tank absorbs heat through the first heat exchange assembly, the carbon dioxide gas drives the turbine to work so as to generate electric energy, and the carbon dioxide gas at an outlet of the turbine is adsorbed into the second storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide energy storage, and particularly relates to a carbon dioxide energy storage system without a gas storage tank. Background Art

[0002] The randomness, volatility and contingency of new energy bring great difficulties to the power grid in absorbing new energy. The carbon dioxide energy storage solution can provide strong support for the power grid to absorb new energy.

[0003] In the related art, a conventional carbon dioxide energy storage solution includes a huge gas storage tank. Taking a 10MW energy storage solution as an example, the size of the gas storage tank can reach 93m×75m×36m, which is equivalent to the size of two football fields. The larger the energy storage capacity, the larger the site required to arrange the gas storage tank, which severely restricts the wide application of the carbon dioxide energy storage solution.

[0004] Therefore, how to reduce the floor area of the carbon dioxide energy storage system is a technical problem that needs to be solved urgently at present. Summary of the Utility Model

[0005] In order to effectively reduce the floor area of the carbon dioxide energy storage system, an embodiment of the utility model provides a carbon dioxide energy storage system without a gas storage tank.

[0006] An embodiment of the utility model provides a carbon dioxide energy storage system without a gas storage tank, which includes a first storage tank, a second storage tank, a first heat exchange component, a second heat exchange component, a compressor and a turbine. The first storage tank is respectively connected to the first heat exchange component and the second heat exchange component. The second storage tank is respectively connected to the compressor and the turbine. The first heat exchange component is connected to the turbine. The second heat exchange component is connected to the compressor. The first storage tank is used for storing carbon dioxide liquid. The second storage tank is used for storing a solid medium or a liquid medium. The solid medium and the liquid medium are used for adsorbing carbon dioxide gas.

[0007] During energy storage, the electricity from new energy or the power grid drives the compressor to work. The carbon dioxide gas adsorbed in the second storage tank forms carbon dioxide liquid after being compressed by the compressor and releasing heat through the second heat exchange component, and then enters the first storage tank.

[0008] During energy release, the carbon dioxide liquid in the first storage tank absorbs heat through the first heat exchange component to obtain carbon dioxide gas. The carbon dioxide gas drives the turbine to work to generate electricity, and the carbon dioxide gas at the outlet of the turbine is adsorbed into the second storage tank.

[0009] In a possible design, the solid medium includes guanidine.

[0010] In a possible design, the liquid medium includes a sodium hydroxide solution.

[0011] In a possible design, the number of the second storage tanks is multiple.

[0012] In a possible design, a heater and a temperature sensor are arranged outside the second storage tank.

[0013] In a possible design, when the liquid medium is stored inside the second storage tank, a stirring rod is arranged in the second storage tank.

[0014] The embodiment of the present utility model provides a carbon dioxide energy storage system without an air chamber. By introducing a solid medium or a liquid medium capable of adsorbing carbon dioxide gas into the second storage tank to replace the air chamber in the related art, the floor area of the energy storage system can be greatly reduced, and the application bottleneck of the carbon dioxide energy storage system can be perfectly broken through. The above technical solution is applicable to new energy units, power grids, and the power consumption side. The unit capacity is applicable to units with a rating of 1 MW to 1000 MW, and the number of units is applicable to continuous construction of 1 unit and multiple units. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of a carbon dioxide energy storage system without an air chamber provided by the embodiment of the present utility model.

[0017] Reference Signs:

[0018] 1 - First storage tank; 2 - Second storage tank; 3 - First heat exchange component; 4 - Second heat exchange component; 5 - Compressor; 6 - Turbine. Detailed Embodiments

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0020] Figure 1This is a schematic structural diagram of a carbon dioxide energy storage system without an air chamber provided by an embodiment of the present utility model. As Figure 1 shown, the carbon dioxide energy storage system without an air chamber includes a first storage tank 1, a second storage tank 2, a first heat exchange component 3, a second heat exchange component 4, a compressor 5 and a turbine 6. The first storage tank 1 is respectively connected to the first heat exchange component 3 and the second heat exchange component 4. The second storage tank 2 is respectively connected to the compressor 5 and the turbine 6. The first heat exchange component 3 is connected to the turbine 6, and the second heat exchange component 4 is connected to the compressor 5. The first storage tank 1 is used to store carbon dioxide liquid, and the second storage tank 2 is used to store a solid medium or a liquid medium, and the solid medium and the liquid medium are used to adsorb carbon dioxide gas.

[0021] In this embodiment, by introducing a solid medium or a liquid medium capable of adsorbing carbon dioxide gas into the second storage tank 2 to replace the air chamber in the related art, the floor area of the energy storage system can be greatly reduced, and the application bottleneck of the carbon dioxide energy storage system can be perfectly broken through. The above technical solution is applicable to new energy units, power grids and the power consumption side. The unit capacity is applicable to units with a rating of 1 MW to 1000 MW, and the number of units is applicable to the continuous construction of 1 unit and multiple units. Moreover, the solid medium or the liquid medium has a high adsorption effect on carbon dioxide and is chemically stable under normal conditions, so that the solid medium or the liquid medium can be transported and put into the energy storage facility in a saturated adsorption state, reducing the steps in the initial construction process.

[0022] During energy storage, the electricity from new energy or the power grid drives the compressor 5 to work. The carbon dioxide gas adsorbed in the second storage tank 2 is compressed by the compressor 5 and forms carbon dioxide liquid after the heat release of the second heat exchange component 4, and then enters the first storage tank 1;

[0023] During energy release, the carbon dioxide liquid in the first storage tank 1 absorbs heat through the first heat exchange component 3 to obtain carbon dioxide gas. The carbon dioxide gas drives the turbine 6 to work to generate electric energy, and the carbon dioxide gas at the outlet of the turbine 6 is adsorbed into the second storage tank 2. In an embodiment of the present utility model, the solid medium includes guanidine.

[0024] In an embodiment of the present utility model, the liquid medium includes sodium hydroxide solution.

[0025] In an embodiment of the present utility model, the number of the second storage tanks 2 is multiple, that is, the second storage tanks 2 can be assembled modularly, and the scale of the adsorption tank can be flexibly controlled according to the capacity of the energy storage facility without customization, simplifying the design and processing process.

[0026] In an embodiment of the present utility model, a heater and a temperature sensor are arranged outside the second storage tank 2.

[0027] In an embodiment of the present utility model, when a liquid medium is stored inside the second storage tank 2, the second storage tank 2 is provided with a stirring rod.

[0028] In this embodiment, by controlling the temperature of the heater and the mechanical stirring of the stirring rod for the second storage tank 2, the solid medium or liquid medium per unit volume has a relatively fast adsorption and desorption rate, not only having the same charging and discharging flexibility as the gas chamber, but also changing the air pressure at the pool end during the adsorption and desorption processes (the air pressure drops during adsorption and rises during desorption), thereby reducing the load on the air pump.

[0029] Specifically, if the adsorption rate needs to be increased, it means that the power generation efficiency needs to be increased (i.e., the rotational speed of the compressor needs to be increased). At this time, the second storage tank 2 should reduce the temperature, reduce the pressure, and reduce the stirring rate, and vice versa; if the desorption rate needs to be increased (i.e., the rotational speed of the turbine needs to be increased), it means that the energy storage efficiency needs to be increased. At this time, the second storage tank 2 should increase the temperature, increase the pressure, and increase the stirring rate.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including an..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A carbon dioxide energy storage system without an air chamber, characterized in that, It includes a first storage tank (1), a second storage tank (2), a first heat exchange component (3), a second heat exchange component (4), a compressor (5) and a turbine (6). The first storage tank (1) is respectively connected to the first heat exchange component (3) and the second heat exchange component (4). The second storage tank (2) is respectively connected to the compressor (5) and the turbine (6). The first heat exchange component (3) is connected to the turbine (6), and the second heat exchange component (4) is connected to the compressor (5). The first storage tank (1) is used for storing carbon dioxide liquid, and the second storage tank (2) is used for storing a solid medium or a liquid medium, and the solid medium and the liquid medium are used for adsorbing carbon dioxide gas.

2. The gas-free carbon dioxide energy storage system according to claim 1, characterized in that, The solid medium includes guanidine.

3. The gas-free carbon dioxide energy storage system according to claim 1, characterized in that, The liquid medium includes sodium hydroxide solution.

4. The gas-free carbon dioxide energy storage system according to claim 1, wherein The number of the second storage tanks (2) is multiple.

5. The gas-free carbon dioxide energy storage system according to claim 1, characterized in that, A heater and a temperature sensor are arranged outside the second storage tank (2).

6. The gas-free carbon dioxide energy storage system according to claim 1, wherein, When the liquid medium is stored inside the second storage tank (2), a stirrer is arranged in the second storage tank (2).

Images