Carbon dioxide energy storage method without gas bin

Abstract

The invention relates to the technical field of carbon dioxide energy storage, in particular to a carbon dioxide energy storage method without a gas bin. The method comprises the steps that during energy storage, electricity from new energy or electricity from a power grid is used for driving a compressor to work, carbon dioxide gas adsorbed in a second storage tank is compressed through the compressor and subjected to heat release through a second heat exchange assembly to form carbon dioxide liquid, and finally the carbon dioxide liquid enters a first storage tank to be stored; during energy release, carbon dioxide gas is obtained after carbon dioxide liquid in the first storage tank absorbs heat through the first heat exchange assembly, and the obtained carbon dioxide gas is used for driving the turbine to work so as to generate electric energy; and the carbon dioxide gas at the outlet of the turbine is adsorbed into the second storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide energy storage, and in particular to a carbon dioxide energy storage method without a gas bin. Background Art

[0002] The randomness, volatility and contingency of new energy make it very difficult for the power grid to absorb new energy. The carbon dioxide energy storage solution can provide strong support for the power grid to absorb new energy.

[0003] In the related technology, conventional carbon dioxide energy storage solutions include huge gas silos. Taking a 10MW energy storage solution as an example, the size of the gas silo 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 silo, which seriously restricts the widespread application of carbon dioxide energy storage solutions.

[0004] Therefore, how to reduce the footprint of the carbon dioxide energy storage system is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to effectively reduce the floor space occupied by a carbon dioxide energy storage system, an embodiment of the present invention provides a carbon dioxide energy storage method without a gas silo.

[0006] An embodiment of the present invention provides a carbon dioxide energy storage method without an air chamber, which is applied to a carbon dioxide energy storage system, wherein the carbon dioxide energy storage system comprises a first storage tank, a second storage tank, a first heat exchange component, a second heat exchange component, a compressor and a turbine, wherein the first storage tank is connected to the first heat exchange component and the second heat exchange component respectively, the second storage tank is connected to the compressor and the turbine respectively, 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 to store carbon dioxide liquid, the second storage tank is used to store solid medium or liquid medium, and the solid medium and the liquid medium are used to adsorb carbon dioxide gas;

[0007] The method comprises:

[0008] During energy storage, the compressor is driven by electricity from new energy sources or power grids, so that the carbon dioxide gas adsorbed in the second storage tank is compressed by the compressor and the second heat exchange component releases heat to form carbon dioxide liquid, which is finally stored in the first storage tank;

[0009] When releasing energy, the carbon dioxide liquid in the first storage tank absorbs heat through the first heat exchange component to obtain carbon dioxide gas, and the obtained carbon dioxide gas is used to drive the turbine to generate electricity; wherein the carbon dioxide gas at the turbine outlet is adsorbed into the second storage tank.

[0010] In one possible design, the solid medium comprises guanidine.

[0011] In one possible design, the liquid medium includes a sodium hydroxide solution.

[0012] In a possible design, there are multiple second storage tanks.

[0013] In a possible design, a heater and a temperature sensor are provided outside the second storage tank.

[0014] In a possible design, when the liquid medium is stored in the second storage tank, the second storage tank is provided with a stirring rod.

[0015] In one possible design, the method further includes:

[0016] If the rate of adsorption is increased, the heater is controlled not to work, the pressure of the second storage tank is reduced, and the stirring rate of the stirring rod is reduced.

[0017] In one possible design, the method further includes:

[0018] If the desorption rate is increased, the heater is controlled to operate, the pressure of the second storage tank is increased, and the stirring rate of the stirring rod is increased.

[0019] The embodiment of the present invention provides a carbon dioxide energy storage method without a gas silo, which introduces a solid medium or liquid medium capable of absorbing carbon dioxide gas into the second storage tank to replace the gas silo in the related art, thereby greatly reducing the footprint of the energy storage system and perfectly breaking through the application bottleneck of the carbon dioxide energy storage solution. The above technical solution is applicable to new energy units, power grids and electricity consumption sides, the unit capacity is applicable to 1MW~1000MW units, and the number of units is applicable to the continuous construction of one or more units. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0021] Figure 1 It is a schematic flow chart of a carbon dioxide energy storage method without a gas chamber provided in an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a carbon dioxide energy storage system without an air chamber provided in an embodiment of the present invention.

[0023] Reference numerals:

[0024] 1-first storage tank; 2-second storage tank; 3-first heat exchange component; 4-second heat exchange component; 5-compressor; 6-turbine. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] like Figure 1 and Figure 2 As shown, the carbon dioxide energy storage method without an air chamber is applied to a carbon dioxide energy storage system, wherein the carbon dioxide energy storage system comprises 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, wherein the first storage tank 1 is connected to the first heat exchange component 3 and the second heat exchange component 4, respectively, the second storage tank 2 is connected to the compressor 5 and the turbine 6, respectively, the first heat exchange component 3 is connected to the turbine 6, the second heat exchange component 4 is connected to the compressor 5, the first storage tank 1 is used to store carbon dioxide liquid, the second storage tank 2 is used to store solid medium or liquid medium, and the solid medium and the liquid medium are used to adsorb carbon dioxide gas;

[0027] The method includes:

[0028] S1. When storing energy, the compressor 5 is driven by electricity from new energy or the power grid, so that the carbon dioxide gas adsorbed in the second storage tank 2 is compressed by the compressor 5 and the second heat exchange component 4 releases heat to form carbon dioxide liquid, and finally enters the first storage tank 1 for storage;

[0029] S2. When releasing energy, the carbon dioxide liquid in the first storage tank 1 absorbs heat through the first heat exchange component 3 to obtain carbon dioxide gas, and the obtained carbon dioxide gas is used to drive the turbine 6 to generate electricity; wherein, the carbon dioxide gas at the outlet of the turbine 6 is adsorbed into the second storage tank 2.

[0030] In this embodiment, a solid medium or liquid medium capable of absorbing carbon dioxide gas is introduced into the second storage tank 2 to replace the gas tank in the related art, which can greatly reduce the floor space occupied by the energy storage method and perfectly break through the application bottleneck of the carbon dioxide energy storage method. The above technical scheme is applicable to new energy units, power grids and electricity consumption sides. The unit capacity is applicable to 1MW to 1000MW units, and the number of units is applicable to the continuous construction of one or more units. Moreover, the solid medium or liquid medium has a high adsorption effect on carbon dioxide, and its chemical properties are stable under normal conditions, so that the solid medium or 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.

[0031] In one embodiment of the present invention, the solid medium comprises guanidine.

[0032] In one embodiment of the present invention, the liquid medium comprises a sodium hydroxide solution.

[0033] In one embodiment of the present invention, there are multiple second storage tanks 2, that is, the second storage tanks 2 can be assembled in a modular manner, and the scale of the adsorption tank can be flexibly controlled according to the capacity of the energy storage facility without customization, thereby simplifying the design and processing process.

[0034] In one embodiment of the present invention, a heater and a temperature sensor are disposed outside the second storage tank 2 .

[0035] In one embodiment of the present invention, when the liquid medium is stored in the second storage tank 2, the second storage tank 2 is provided with a stirring rod.

[0036] In this embodiment, by controlling the temperature of the heater and the mechanical stirring of the stirring rod in the second storage tank 2, the solid medium or liquid medium per unit volume has a faster adsorption and desorption rate, and not only has the flexibility of filling and discharging gas comparable to that of a gas warehouse, but also changes the pool end gas pressure during the adsorption and desorption process (lowering the pressure during adsorption and increasing the pressure during desorption), thereby reducing the load on the air pump.

[0037] Specifically, if the adsorption rate needs to be increased, it means that the efficiency of power generation needs to be increased (that is, the speed of the compressor needs to be increased). At this time, the second storage tank 2 should lower the temperature, lower the pressure and lower the stirring rate, and vice versa; if the desorption rate needs to be increased (that is, the speed of the turbine needs to be increased), it means that the efficiency of energy storage needs to be increased. At this time, the second storage tank 2 should increase the temperature, increase the pressure and increase the stirring rate.

[0038] 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 such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical factors in the process, method, article or device including the elements.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 embodiments of the present invention.

Claims

1. A carbon dioxide energy storage method without an air chamber, characterized in that: Applicable to a carbon dioxide energy storage system, the carbon dioxide energy storage system comprising 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) being connected to the first heat exchange component (3) and the second heat exchange component (4) respectively, the second storage tank (2) being connected to the compressor (5) and the turbine (6) respectively, the first heat exchange component (3) being connected to the turbine (6), the second heat exchange component (4) being connected to the compressor (5), the first storage tank (1) being used to store carbon dioxide liquid, the second storage tank (2) being used to store solid medium or liquid medium, the solid medium and the liquid medium being used to adsorb carbon dioxide gas; The method comprises: During energy storage, the compressor (5) is driven by electricity from a new energy source or a power grid, so that the carbon dioxide gas adsorbed in the second storage tank (2) is compressed by the compressor (5) and the second heat exchange component (4) releases heat to form carbon dioxide liquid, which finally enters the first storage tank (1) for storage; When releasing energy, the carbon dioxide liquid in the first storage tank (1) absorbs heat through the first heat exchange component (3) to obtain carbon dioxide gas, and the obtained carbon dioxide gas is used to drive the turbine (6) to work to generate electrical energy; wherein the carbon dioxide gas at the outlet of the turbine (6) is adsorbed into the second storage tank (2).

2. The method for storing carbon dioxide energy in a gas-free warehouse according to claim 1, characterized in that: The solid medium comprises guanidine.

3. The method for storing carbon dioxide energy in an airless warehouse according to claim 1, characterized in that: The liquid medium includes a sodium hydroxide solution.

4. The method for storing carbon dioxide energy in an airless warehouse according to claim 1, characterized in that: The number of the second storage tanks (2) is multiple.

5. The method for storing carbon dioxide energy in an airless warehouse according to claim 1, characterized in that: A heater and a temperature sensor are arranged outside the second storage tank (2).

6. The method for storing carbon dioxide energy in an airless warehouse according to claim 5, characterized in that: When the liquid medium is stored in the second storage tank (2), the second storage tank (2) is provided with a stirring rod.

7. The method for storing carbon dioxide energy in an airless warehouse according to claim 6, characterized in that: The method further comprises: If the adsorption rate is increased, the heater is controlled not to work, the pressure of the second storage tank (2) is reduced, and the stirring rate of the stirring rod is reduced.

8. The method for storing carbon dioxide energy in a gas-free warehouse according to claim 6, characterized in that: The method further comprises: If the desorption rate is to be increased, the heater is controlled to operate, the pressure of the second storage tank (2) is increased and the stirring rate of the stirring rod is increased.

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