CN116067060A

CN116067060A - Compressed air energy storage distributed combined cycle system and method

Info

Publication number: CN116067060A
Application number: CN202310033021.2A
Authority: CN
Inventors: 张丁凡; 宋金时; 郑磊; 黄伟
Original assignee: Suzhou Xire Energy Saving Environmental Protection Technology Co Ltd
Current assignee: Suzhou Xire Energy Saving Environmental Protection Technology Co Ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-05-05

Abstract

The present disclosure provides a compressed air energy storage distributed combined cycle system and method, the system includes a liquefied air storage tank, an evaporator, a brayton cycle module, a liquefied air cold storage tank, a power generation module, a user heat exchange module and a control module, the liquefied air cold storage tank includes a first heat exchanger arranged at the bottom of the tank, a second heat exchanger in the tank, a third heat exchanger at the top of the tank, and a cold storage medium; the method comprises the steps that liquefied air in a liquefied air storage tank passes through an evaporator to obtain first steam, a second heat exchanger utilizes the first steam to refrigerate a cold storage medium in the tank to output second steam, a power generation module utilizes the second steam to generate power to output exhaust gas, a third heat exchanger utilizes the exhaust gas to refrigerate the cold storage medium at the top of the tank, the first heat exchanger utilizes a circulating medium of a Brayton cycle module to refrigerate the cold storage medium at the bottom of the tank, and a user heat exchange module is used for utilizing the cold storage medium to cool a cold object. According to the system disclosed by the invention, the refrigerating effect can be improved, and the system structure in a multi-operation mode can be simplified.

Description

Compressed air energy storage distributed combined cycle system and method

Technical Field

The disclosure relates to the technical field of energy storage, refrigeration and power generation, in particular to a compressed air energy storage distributed combined cycle system and a method.

Background

With the deep advancement of carbon peaks and carbon neutralization targets, a large-scale wind-solar generator set is integrated into a power grid, so that more uncontrollability is brought to the power grid, and energy storage becomes an indispensable flexible resource increasingly. The compressed air energy storage has the advantages of long service life, large scale, long energy storage time, no limitation of geographical conditions and the like, and becomes a novel energy storage technology which is of great concern.

At present, the application mode of the compressed air energy storage technology is centralized, namely, when the generated energy of new energy is larger than the load, the compressed air generated by the compressor is stored in situ, and when the electric load is increased, the compressed air generates electricity through the expander. And the distributed liquid air refrigeration technology is a viable zero-carbon refrigeration technology alternative. Meanwhile, the market demand of cold chain products in China is rapidly increased, the construction of the refrigeration transportation industry faces the outstanding contradiction of scale expansion and carbon emission control, and the optimization of a cold supply structure is urgently needed, so that the development of the freezing and refrigerating green equipment and key technology based on zero-carbon energy is increasingly emphasized.

The prior art lacks a compressed air energy storage distributed combined cycle technology which has good refrigeration effect and is simple in structure and integrates multiple operation modes such as refrigeration, power generation and the like.

Disclosure of Invention

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art. It is therefore an object of the present disclosure to provide a compressed air energy storage distributed combined cycle system, which is mainly aimed at improving the refrigeration effect and simplifying the system structure in multiple operation modes.

A second object of the present disclosure is to propose a compressed air energy storage distributed combined cycle method.

To achieve the above object, an embodiment of a first aspect of the present disclosure provides a compressed air energy storage distributed combined cycle system, including a liquefied air storage tank, an evaporator, a brayton cycle module, a liquefied air cold storage tank, a power generation module, a user heat exchange module, and a control module connected to the evaporator, the brayton cycle module, the liquefied air cold storage tank, the power generation module, the user heat exchange module, respectively, wherein,

the liquefied air cold accumulation tank comprises a first heat exchanger arranged at the bottom of the tank, a second heat exchanger arranged in the tank, a third heat exchanger arranged at the top of the tank and a stored cold accumulation medium;

the liquefied air storage tank is used for storing liquefied air;

the evaporator is used for evaporating the liquefied air from the liquefied air storage tank to obtain first steam, the evaporator is connected with the second heat exchanger, and the second heat exchanger utilizes the first steam to refrigerate a cold storage medium in the tank and outputs second steam;

the Brayton cycle module comprises a cycle medium, the Brayton cycle module is connected with the first heat exchanger, the first heat exchanger utilizes the cycle medium to refrigerate cold storage medium at the bottom of the tank, and the Brayton cycle module is used for providing heat energy required by liquefied air evaporation for the evaporator;

the power generation module is connected with the second heat exchanger and the third heat exchanger, the power generation module generates power by utilizing the second steam to output exhaust gas, and the third heat exchanger utilizes the exhaust gas to refrigerate a cold storage medium on the tank top;

the user heat exchange module is used for utilizing the cold accumulation medium output by the liquefied air cold accumulation tank to cool a cold object.

In one embodiment of the present disclosure, the brayton cycle module includes a compressor and a first turbine, an output of the compressor is connected to an inlet of the first heat exchanger, an input of the first turbine is connected to an outlet of the first heat exchanger, an output of the first turbine is connected to an input of the compressor via a conduit, and the conduit passes through the evaporator.

In one embodiment of the present disclosure, a first circulation pump is provided between the evaporator and the liquefied air storage tank.

In one embodiment of the disclosure, the customer heat exchange module includes a customer side heat exchanger that receives the cold storage medium from the liquefied air cold storage tank and returns the cold storage medium after heat exchange to the liquefied air cold storage tank.

In one embodiment of the disclosure, the customer heat exchange module further includes a second circulation pump connecting the liquefied air cold storage tank and the customer side heat exchanger.

In one embodiment of the present disclosure, the brayton cycle module further comprises a flow control valve disposed on the conduit for regulating the flow of the circulating medium in the conduit.

In one embodiment of the present disclosure, the power generation module includes a second turbine.

In order to achieve the above object, a second aspect of the present disclosure provides a compressed air energy storage distributed combined cycle method of the compressed air energy storage distributed combined cycle system adopting any one of the above embodiments, including:

the first heat exchanger in the liquefied air cold accumulation tank utilizes a circulating medium of the Brayton cycle module to refrigerate a cold accumulation medium at the bottom of the tank;

providing the heat energy required by the evaporation of the liquefied air for the evaporator by utilizing a Brayton cycle module;

the method comprises the steps that liquefied air in a liquefied air storage tank is sent to an evaporator to be evaporated to obtain first steam, a second heat exchanger in the liquefied air cold storage tank utilizes the first steam to refrigerate cold storage media in the tank, and second steam is output;

and sending the second steam to a power generation module to generate spent gas, and refrigerating a cold accumulation medium at the top of the tank by using the spent gas by a third heat exchanger in the liquefied air cold accumulation tank, so that the combined cycle of multiple operation modes is realized.

In one embodiment of the present disclosure, power generation is performed by a first turbine of a brayton cycle module.

In one embodiment of the present disclosure, a first temperature of a first vapor and a second temperature of a cold storage medium in a tank are obtained, and a flow control valve of the brayton cycle module is adjusted based on the first temperature and the second temperature.

In one or more embodiments of the present disclosure, a compressed air energy storage distributed combined cycle system includes a liquefied air storage tank, an evaporator, a brayton cycle module, a liquefied air cold storage tank, a power generation module, a user heat exchange module, and a control module, the control module being respectively connected to the evaporator, the brayton cycle module, the liquefied air cold storage tank, the power generation module, and the user heat exchange module, wherein the liquefied air cold storage tank includes a first heat exchanger disposed at a tank bottom, a second heat exchanger disposed in the tank, and a third heat exchanger disposed at a tank top, and a stored cold storage medium; the liquefied air storage tank is used for storing the liquefied air; the evaporator is used for evaporating the liquefied air from the liquefied air storage tank to obtain first steam, the evaporator is connected with the second heat exchanger, and the second heat exchanger utilizes the first steam to refrigerate a cold storage medium in the tank and outputs second steam; the Brayton cycle module comprises a cycle medium, the Brayton cycle module is connected with a first heat exchanger, the first heat exchanger utilizes the cycle medium to refrigerate cold storage medium at the bottom of the tank, and the Brayton cycle module is used for providing heat energy required by evaporation of liquefied air for the evaporator; the power generation module is connected with the second heat exchanger and the third heat exchanger, the power generation module generates power by using the second steam to output exhaust gas, and the third heat exchanger uses the exhaust gas to refrigerate a cold storage medium on the tank top; the user heat exchange module is used for cooling a cold storage medium output by the liquefied air cold storage tank. Under the condition, the first heat exchanger utilizes the circulating medium of the Brayton cycle module to refrigerate the cold storage medium at the tank bottom, the second heat exchanger utilizes the first steam to refrigerate the cold storage medium in the tank to output the second steam, and the third heat exchanger utilizes the exhaust gas to refrigerate the cold storage medium at the tank top, so that the refrigerating effect is improved, and meanwhile, the power generation module for generating the exhaust gas is utilized to generate power, so that the system structure in the multi-operation mode is simplified.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 illustrates a block diagram of a compressed air energy storage distributed combined cycle system provided by an embodiment of the present disclosure;

FIG. 2 illustrates a block diagram of a compressed air energy storage distributed combined cycle system provided by an embodiment of the present disclosure;

FIG. 3 illustrates a schematic flow diagram of a compressed air energy storage distributed combined cycle process provided by an embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with aspects of embodiments of the present disclosure as detailed in the accompanying claims.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise. It should also be understood that the term "and/or" as used in this disclosure refers to and encompasses any or all possible combinations of one or more of the associated listed items.

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present disclosure and are not to be construed as limiting the present disclosure.

The present disclosure relates to a compressed air energy storage distributed combined cycle system and method, and is mainly aimed at improving refrigeration effect and simplifying system structure in multiple operation modes. The compressed air energy storage distributed combined cycle system of the present disclosure may be referred to simply as a distributed combined cycle system.

In a first embodiment, FIG. 1 illustrates a block diagram of a compressed air energy storage distributed combined cycle system provided by an embodiment of the present disclosure; FIG. 2 illustrates a block diagram of a compressed air energy storage distributed combined cycle system provided by an embodiment of the present disclosure. As shown in fig. 1, the compressed air energy storage distributed combined cycle system 10 includes a liquefied air storage tank 11, an evaporator 12, a brayton cycle module 13, a liquefied air cold storage tank 14, a power generation module 15, a user heat exchange module 16, and a control module 17, wherein the control module 17 is respectively connected with the evaporator 12, the brayton cycle module 13, the liquefied air cold storage tank 14, the power generation module 15, and the user heat exchange module 16.

In the present embodiment, the liquefied air storage tank 11 is used to store liquefied air. As will be readily appreciated, liquefied air is a compressed air after the normal gas has been liquefied. The liquefied air storage tank 11 stores pressurized liquefied air using a compressed air energy storage technology.

In the present embodiment, the evaporator 12 is used to evaporate the liquefied air from the liquefied air storage tank 11 to obtain the first vapor. Wherein the heat energy required by the evaporator 12 in evaporating the liquefied air is provided by the brayton cycle module 13.

In the present embodiment, a first circulation pump (see fig. 2) is further provided between the evaporator 12 and the liquefied air storage tank 11. The first circulation pump is used to send the liquefied air of the liquefied air storage tank 11 to the evaporator 12.

In the present embodiment, an on-off valve is provided between the first circulation pump and the liquefied air storage tank 11. Specifically, the first circulation pump is connected to the liquefied air storage tank 11 through a pipe 1A, and an on-off valve is further provided on the pipe 1A (see fig. 2). The on-off valve is connected with the control module 17. The state of the on-off valve is controlled by the control module 17. If the on-off valve receives the on-command sent by the control module 17, the on-off valve is turned on, and the liquefied air in the liquefied air storage tank 11 enters the first circulation pump.

In the present embodiment, the first circulation pump is connected to the evaporator 12 through a pipe 2A (see fig. 2).

In the present embodiment, the evaporator 12 is connected to a second heat exchanger S2 (described later) of the liquefied air cold storage tank 14. Specifically, the evaporator 12 is connected to the second heat exchanger S2 of the liquefied air cold storage tank 14 through a pipe 3A (see fig. 2), and the first vapor output from the evaporator 12 enters the second heat exchanger S2 through the pipe 3A.

In the present embodiment, the brayton cycle module 13 comprises a cycle medium, the brayton cycle module 13 being connected to the first heat exchanger. The brayton cycle module 13 is used to provide the heat energy required for the evaporation of the liquefied air to the evaporator 12.

Specifically, as shown in fig. 2, the brayton cycle module 13 includes a compressor, an output end of which is connected to an inlet of the first heat exchanger S1 of the liquefied air cold storage tank 14 through a pipe 2B, and a first turbine, an input end of which is connected to an outlet of the first heat exchanger S1 through a pipe 3B, an output end of which is connected to an input end of the compressor via a pipe, and the pipe passes through the evaporator 12. Wherein the conduit between the output of the first turbine and the input of the compressor is independent (i.e., not in communication) with the line of liquefied air in the evaporator 12 at the evaporator 12. The conduit between the output of the first turbine and the evaporator 12 is conduit 4B, and the conduit between the evaporator 12 and the input of the compressor is conduit 1B.

The components in the brayton cycle module 13 between the lines 1B-2B-3B-4B and adjacent lines form a closed brayton cycle. The circulating medium circularly flows in the pipeline 1B-2B-3B-4B, so that 4 processes of adiabatic compression, isobaric heating, adiabatic expansion and isobaric cooling of the circulating medium are completed, wherein the corresponding process of the circulating medium passing through the evaporator 12 is isobaric cooling, the corresponding process of the circulating medium passing through the compressor is adiabatic compression, the corresponding process of the circulating medium passing through the first heat exchanger S1 is isobaric heating, and the corresponding process of the circulating medium passing through the first turbine is adiabatic expansion.

During the isobaric cooling process, the circulating medium releases thermal energy at the evaporator 12 to complete the cooling, which is absorbed by the liquefied air in the evaporator 12, which becomes the first vapor to be output from the evaporator 12.

During adiabatic compression, the circulating medium is warmed and pressurized at the compressor.

In the isobaric heating process, the circulating medium absorbs heat from the cold storage medium at the tank bottom at the first heat exchanger S1 to finish heating.

In the adiabatic expansion process, the circulating medium expands at the first turbine to generate electricity, and the generated electricity can supply electricity to electric equipment.

The circulating medium may use a variety of gases, such as neon, helium or hydrogen, which have a boiling point lower than the liquefied air at the evaporator.

The brayton cycle module 13 further comprises a flow control valve arranged on the conduit between the output of the first turbine and the input of the compressor, the flow control valve being adapted to regulate the flow of the circulating medium in the conduit. The flow control valve is connected to the control module 17.

In the present embodiment, the cold storage medium stored in the liquefied air cold storage tank 14 is sent to the cold user to cool the cold object when the cold user needs to cool.

In this embodiment, as shown in fig. 2, the liquefied air cold storage tank 14 includes a first heat exchanger S1 disposed at the bottom of the tank, a second heat exchanger S2 disposed in the tank, and a third heat exchanger S3 disposed at the top of the tank, and the cold storage medium is cooled by the first heat exchanger S1, the second heat exchanger S2, and the third heat exchanger S3.

Specifically, the first heat exchanger S1 uses the circulating medium to cool the cold storage medium at the tank bottom, that is, the circulating medium stores the cold in the cold storage medium at the tank bottom at the first heat exchanger S1.

The second heat exchanger S2 uses the first vapor to cool the cold storage medium in the tank to output the second vapor, that is, after the first vapor stores the cold in the cold storage medium in the tank at the second heat exchanger S2, the temperature and the pressure of the first vapor increase to become the second vapor.

The third heat exchanger S3 uses the exhaust gas (described later) to cool the cold storage medium on the tank top, that is, the exhaust gas stores the cold in the cold storage medium on the tank top at the third heat exchanger S3 and then discharges the cold to the atmosphere through the pipeline 6A.

In this embodiment, the first heat exchanger S1, the second heat exchanger S2, and the third heat exchanger S3 are separate immersion heat exchangers, respectively.

In the present embodiment, the power generation module 15 generates power using the second steam to output exhaust gas.

Specifically, the power generation module 15 connects the second heat exchanger and the third heat exchanger, and as shown in fig. 2, the power generation module 15 includes a second turbine. The input end of the second turbine is connected with the second heat exchanger S2 through a pipeline 4A, and the output end of the second turbine is connected with the third heat exchanger S3 through a pipeline 5A. The second steam enters a second turbine to expand and generate electricity, and the generated exhaust gas is exhausted. The generated electric energy can be used for electric equipment, and the exhaust gas enters a third heat exchanger to refrigerate the cold storage medium.

In this embodiment, the distributed combined cycle system further includes a first temperature sensor for monitoring the temperature of the cold storage medium in the tank and a second temperature sensor for monitoring the temperature of the first vapor, the first temperature sensor and the second temperature sensor being respectively connected to the control module 17, and when the first vapor temperature (i.e., the first temperature) is monitored to be higher than or equal to the temperature of the cold storage medium (i.e., the second temperature), the control module controls the flow control valve of the brayton cycle module 13 to reduce the flow in the pipe.

In this embodiment, the user heat exchange module 16 is at the cold user. The user heat exchange module 16 is used for cooling a cooling object by using the cold storage medium output by the liquefied air cold storage tank 14.

In this embodiment, as shown in fig. 2, the user heat exchange module 16 includes a user side heat exchanger, and the user side heat exchanger receives the cold storage medium from the liquefied air cold storage tank 14 and returns the cold storage medium after heat exchange to the liquefied air cold storage tank 14.

In this embodiment, the customer heat exchange module 16 further includes a second circulation pump that connects the liquefied air cold storage tank 14 and the customer side heat exchanger (see fig. 2). The second circulating pump is used for sending the cold accumulation medium to the user side heat exchanger.

In some embodiments, the cold user is, for example, a refrigerator car, and the cold storage medium enters the refrigerator car under the action of the second circulating pump, exchanges heat with the environment in the car, heats up, returns to the liquefied air cold storage tank 14 for cooling, and completes the cycle.

In the present embodiment, the control module 17 is connected to the evaporator 12, the brayton cycle module 13, the liquefied air cold storage tank 14, the power generation module 15, and the user heat exchange module 16, respectively.

In this embodiment, when refrigeration and power generation are needed, the control module 17 generates a conduction instruction, controls the switch valve to be turned on, and controls the evaporator 12, the brayton cycle module 13, the liquefied air cold storage tank 14, the power generation module 15 and the user heat exchange module 16 to operate normally, so as to realize combined cycle in multiple modes.

In the compressed air energy storage distributed combined cycle system disclosed by the invention, the compressed air energy storage distributed combined cycle system comprises a liquefied air storage tank, an evaporator, a Brayton cycle module, a liquefied air cold storage tank, a power generation module, a user heat exchange module and a control module, wherein the control module is respectively connected with the evaporator, the Brayton cycle module, the liquefied air cold storage tank, the power generation module and the user heat exchange module, and the liquefied air cold storage tank comprises a first heat exchanger arranged at the bottom of the tank, a second heat exchanger arranged in the tank, a third heat exchanger arranged at the top of the tank and a stored cold storage medium; the liquefied air storage tank is used for storing the liquefied air; the evaporator is used for evaporating the liquefied air from the liquefied air storage tank to obtain first steam, the evaporator is connected with the second heat exchanger, and the second heat exchanger utilizes the first steam to refrigerate a cold storage medium in the tank and outputs second steam; the Brayton cycle module comprises a cycle medium, the Brayton cycle module is connected with a first heat exchanger, the first heat exchanger utilizes the cycle medium to refrigerate cold storage medium at the bottom of the tank, and the Brayton cycle module is used for providing heat energy required by evaporation of liquefied air for the evaporator; the power generation module is connected with the second heat exchanger and the third heat exchanger, the power generation module generates power by using the second steam to output exhaust gas, and the third heat exchanger uses the exhaust gas to refrigerate a cold storage medium on the tank top; the user heat exchange module is used for cooling a cold storage medium output by the liquefied air cold storage tank. Under the condition, the first heat exchanger utilizes the circulating medium of the Brayton cycle module to refrigerate the cold storage medium at the tank bottom, the second heat exchanger utilizes the first steam to refrigerate the cold storage medium in the tank to output the second steam, and the third heat exchanger utilizes the exhaust gas to refrigerate the cold storage medium at the tank top, so that the refrigerating effect is improved, and meanwhile, the power generation module for generating the exhaust gas is utilized to generate power, so that the system structure in the multi-operation mode is simplified. In addition, through the coupling of liquefied air circulation and brayton cycle, the utilization ratio of compressed air cold energy is improved, and system efficiency is improved. The distributed combined cycle system of the present disclosure also has a zero carbon mode of operation; the refrigerating effect is good, and the refrigerating effect is not influenced by the ambient temperature; the heat emission to the environment is reduced; the operation modes are various and the switching is convenient; the refrigeration energy consumption is greatly reduced, and the like.

The following are method embodiments of the present disclosure, and for details not disclosed in the method embodiments of the present disclosure, reference is made to system embodiments of the present disclosure. The embodiment of the method provides a compressed air energy storage distributed combined cycle method. The compressed air energy storage distributed combined cycle method adopts the compressed air energy storage distributed combined cycle system of the embodiment of the system to realize the combined cycle with multiple operation modes. The compressed air energy storage distributed combined cycle process of the present disclosure may be referred to simply as a combined cycle process.

FIG. 3 illustrates a schematic flow diagram of a compressed air energy storage distributed combined cycle process provided by an embodiment of the present disclosure. As shown in fig. 3, the compressed air energy storage distributed combined cycle method comprises the following steps:

s11, refrigerating a cold accumulation medium at the bottom of a liquefied air cold accumulation tank by using a circulating medium of a Brayton cycle module by a first heat exchanger in the liquefied air cold accumulation tank;

step S12, utilizing the Brayton cycle module to provide the heat energy required by the evaporation of the liquefied air for the evaporator;

step S13, delivering the liquefied air in the liquefied air storage tank to an evaporator for evaporation to obtain first steam, refrigerating a cold storage medium in the tank by a second heat exchanger in the liquefied air cold storage tank by using the first steam, and outputting second steam;

and S14, sending the second steam to a power generation module to generate exhaust gas, and refrigerating a cold accumulation medium at the top of the tank by using the exhaust gas by a third heat exchanger in the liquefied air cold accumulation tank, so as to realize the combined cycle of multiple operation modes.

Optionally, the compressed air energy storage distributed combined cycle method further comprises generating electricity by a first turbine of the brayton cycle module.

Optionally, the compressed air energy storage distributed combined cycle method further includes obtaining a first temperature of the first vapor and a second temperature of the cold storage medium in the tank, adjusting a flow control valve of the brayton cycle module based on the first temperature and the second temperature.

It should be noted that the foregoing explanation of the embodiment of the compressed air energy storage distributed combined cycle system is also applicable to the compressed air energy storage distributed combined cycle method of this embodiment, and is not repeated herein.

The foregoing embodiment numbers of the present disclosure are merely for description and do not represent advantages or disadvantages of the embodiments.

In the compressed air energy storage distributed combined cycle method disclosed by the disclosure, a first heat exchanger in a liquefied air cold storage tank utilizes a circulating medium of a Brayton cycle module to refrigerate a cold storage medium at the bottom of the tank; providing the heat energy required by the evaporation of the liquefied air for the evaporator by utilizing a Brayton cycle module; the method comprises the steps that liquefied air in a liquefied air storage tank is sent to an evaporator to be evaporated to obtain first steam, a second heat exchanger in the liquefied air cold storage tank utilizes the first steam to refrigerate cold storage media in the tank, and second steam is output; and sending the second steam to a power generation module to generate spent gas, and refrigerating a cold accumulation medium at the top of the tank by using the spent gas by a third heat exchanger in the liquefied air cold accumulation tank, so that the combined cycle of multiple operation modes is realized. Under the condition, the first heat exchanger utilizes the circulating medium of the Brayton cycle module to refrigerate the cold storage medium at the tank bottom, the second heat exchanger utilizes the first steam to refrigerate the cold storage medium in the tank to output the second steam, and the third heat exchanger utilizes the exhaust gas to refrigerate the cold storage medium at the tank top, so that the refrigerating effect is improved, and meanwhile, the power generation module for generating the exhaust gas is utilized to generate power, so that the system structure in the multi-operation mode is simplified. In addition, through the coupling of liquefied air circulation and brayton cycle, the utilization ratio of compressed air cold energy is improved, and system efficiency is improved. The distributed combined cycle method of the present disclosure also has a zero carbon mode of operation; the refrigerating effect is good, and the refrigerating effect is not influenced by the ambient temperature; the heat emission to the environment is reduced; the operation modes are various and the switching is convenient; the refrigeration energy consumption is greatly reduced, and the like.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present disclosure may be performed in parallel, sequentially, or in a different order, so long as the desired result of the technical solution of the present disclosure is achieved, and the present disclosure is not limited herein.

The above detailed description should not be taken as limiting the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.

Claims

1. The utility model provides a compressed air energy storage distributed combined cycle system which is characterized in that the system comprises a liquefied air storage tank, an evaporator, a Brayton cycle module, a liquefied air cold storage tank, a power generation module, a user heat exchange module and a control module, wherein the control module is respectively connected with the evaporator, the Brayton cycle module, the liquefied air cold storage tank, the power generation module and the user heat exchange module,

the liquefied air storage tank is used for storing liquefied air;

2. The compressed air energy storage distributed combined cycle system of claim 1, wherein: the brayton cycle module comprises a compressor and a first turbine, wherein the output end of the compressor is connected with the inlet of the first heat exchanger, the input end of the first turbine is connected with the outlet of the first heat exchanger, the output end of the first turbine is connected with the input end of the compressor through a conduit, and the conduit passes through the evaporator.

3. The compressed air energy storage distributed combined cycle system of claim 2, wherein: a first circulating pump is arranged between the evaporator and the liquefied air storage tank.

4. The compressed air energy storage distributed combined cycle system of claim 3, wherein: the user heat exchange module comprises a user side heat exchanger, the user side heat exchanger receives the cold accumulation medium from the liquefied air cold accumulation tank and sends the cold accumulation medium subjected to heat exchange back to the liquefied air cold accumulation tank.

5. The compressed air energy storage distributed combined cycle system of claim 4, wherein: the user heat exchange module further comprises a second circulating pump, and the second circulating pump is connected with the liquefied air cold accumulation tank and the user side heat exchanger.

6. The compressed air energy storage distributed combined cycle system of claim 5, wherein: the brayton cycle module further includes a flow control valve disposed on the conduit for regulating the flow of the circulating medium in the conduit.

7. The compressed air energy storage distributed combined cycle system of claim 6, wherein: the power generation module includes a second turbine.

8. A compressed air energy storage distributed combined cycle method based on a compressed air energy storage distributed combined cycle system according to any one of claims 1 to 7, comprising:

9. The compressed air energy storage distributed combined cycle method of claim 8, further comprising:

the power generation is performed by a first turbine of the brayton cycle module.

10. The compressed air energy storage distributed combined cycle method of claim 8, further comprising:

a first temperature of a first vapor and a second temperature of a cold storage medium in a tank are obtained, and a flow control valve of the brayton cycle module is adjusted based on the first temperature and the second temperature.