Comprehensive energy supply system coupled with compressed air energy storage and user side

Abstract

The application relates to a comprehensive energy supply system of compressed air energy storage coupled with a user side, which comprises a steam network, an air energy storage system and a user end; the air energy storage system comprises an air compression assembly, a steam generator, a compressed air storage tank, a first steam heater and a power generation assembly connected with the electric network in sequence, the steam generator is connected with a water inlet pipeline at a water inlet, and the steam outlet is connected with the user end; the steam inlet of the first steam heater is connected with the steam network, and the steam outlet is connected with the user end; when the air is stored, the air is compressed by the air compression assembly, is sent to the steam generator and is stored in the compressed air storage tank; when the compressed air is used, the compressed air enters the first steam heater and is heated by the steam from the steam network, and the heated compressed air enters the power generation assembly to generate power. The air energy storage system is coupled with the user side, can generate power, can provide various quality steam for the user and comprehensively supplies energy.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, and in particular to a comprehensive energy supply system that couples compressed air energy storage to the user side. Background Technology

[0002] Thermal energy storage systems are a major component of compressed air energy storage systems. Their primary function is to absorb the heat of compression from the compressor during energy storage and release this heat to heat the compressed air during energy release, thereby improving system efficiency. The high cost of thermal energy storage systems is one of the main factors affecting the overall economic viability of the system. Currently, compressed air energy storage systems are mainly used as independent energy storage systems with limited integration with the user side. Multi-energy flow coupled integrated energy supply systems represent an important direction for future development. Therefore, this paper proposes an integrated energy supply system that couples compressed air energy storage to the user side. Summary of the Invention

[0003] This invention provides a comprehensive energy supply system that couples compressed air energy storage with the user side, thereby coupling the air energy storage system with the user side, which can generate electricity and provide users with steam of various qualities, thus providing comprehensive energy supply.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A comprehensive energy supply system coupling compressed air energy storage to the user side includes a steam network, an air energy storage system, and a user terminal;

[0006] The aforementioned air energy storage system includes an air compression assembly, a steam generator, a compressed air storage tank, a first steam heater, and a power generation assembly connected to the power grid, which are connected in sequence. The steam generator has a water inlet pipe connected to its inlet and a steam outlet connected to the aforementioned user terminal.

[0007] The steam inlet of the first steam heater is connected to the steam network, and the steam outlet is connected to the user terminal.

[0008] When storing air, the air is compressed by the air compression assembly and then stored in the compressed air storage tank via the steam generator. When using compressed air, the compressed air enters the first steam heater and is heated by steam from the steam network. The heated compressed air then enters the power generation assembly to generate electricity.

[0009] Preferably, the air compression assembly includes a first air compressor, the outlet of the first air compressor is connected to the inlet of the steam generator, the first air compressor has a first inlet and a second inlet, the first inlet is connected to an air duct, and the second inlet is connected to the steam network.

[0010] Preferably, the air compression assembly further includes a second air compressor connected to the power grid, and the steam generator has a first air inlet, a second air inlet, a first air outlet, and a second air outlet;

[0011] The outlet of the first air compressor is connected to the first air inlet, and the first air outlet is connected to the air inlet of the second air compressor.

[0012] The outlet of the second air compressor is connected to the second inlet, and the second outlet is connected to the inlet of the compressed air tank.

[0013] Preferably, the steam outlet of the first air compressor is connected to the user terminal.

[0014] Preferably, the power generation assembly includes a first turbine, a second turbine, and a generator connected to the power grid, wherein the first turbine, the second turbine, and the generator are coaxially arranged.

[0015] A second steam heater is connected between the first turbine and the second turbine to heat the compressed air.

[0016] Preferably, the steam inlet of the second steam heater is connected to the steam network, and the steam outlet is connected to the user terminal.

[0017] Preferably, it further includes a preheater, the outlet of which is connected to the inlet of the air compression assembly.

[0018] The hot water outlet pipe at the user end is connected to the inlet of the preheater to preheat the air.

[0019] Preferably, the user terminals include industrial users and residential users, and a first water supply pipe is connected between the industrial users and the residential users to provide hot water to the residential users.

[0020] The steam outlet of the aforementioned steam generator is connected to the aforementioned industrial user, the steam outlet of the aforementioned first steam heater is connected to the aforementioned industrial user, and the steam outlet of the aforementioned air compression assembly is connected to the aforementioned industrial user.

[0021] The outlet of the aforementioned compressed air storage tank is connected to the aforementioned industrial user for supplying compressed air to the aforementioned industrial user;

[0022] The air outlet of the aforementioned power generation component is connected to the aforementioned residential user to provide the residential user with air at a certain temperature.

[0023] Preferably, the user terminal further includes a refrigeration unit, and a second water supply pipe is connected between the industrial user and the refrigeration unit to provide a heat source to the refrigeration unit; a gas supply pipe is connected between the refrigeration unit and the residential user to provide cold air to the residential user.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The heat generated by the air compression component is used to exchange heat with water in the steam generator to produce steam for the user. The user is the end of the compressor's heat consumption, eliminating the need for heat storage equipment for compressed air energy storage and reducing costs.

[0026] 2. A first steam heater is also installed to replace the compressed air for heating, ensuring the power generation efficiency of the power generation components. The first steam heater uses steam from the steam network as a heat exchange source. After heat exchange, the steam will enter the user end, utilizing the energy that would otherwise be wasted by the steam network directly entering the user end through the desuperheating and pressure reducing valve to heat the compressed air, thus realizing energy utilization.

[0027] 3. By coupling the air energy storage system with the user side, it can generate electricity and provide users with steam of various qualities, thus providing comprehensive energy supply. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall system in an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Steam network; 2. Power grid; 3. First air compressor; 4. Second air compressor; 5. Steam generator; 6. Compressed air storage tank; 7. First steam heater; 8. First turbine; 9. Second steam heater; 10. Second turbine; 11. Generator; 12. Industrial user; 13. First water supply pipeline; 14. Second water supply pipeline; 15. Refrigeration unit; 16. Residential user; 17. Preheater. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figure 1 As shown, this embodiment of the invention provides a comprehensive energy supply system for compressed air energy storage coupled to the user side, including a steam network 1, an air energy storage system, and a user end; wherein the air energy storage system includes an air compression assembly, a steam generator 5, a compressed air storage tank 6, a first steam heater 7, and a power generation assembly connected to the power grid 2 in sequence; the steam generator 5 has a water inlet pipe connected to its inlet and a steam outlet connected to the user end; the first steam heater 7 has a steam inlet connected to the steam network 1 and a steam outlet connected to the user end; specifically, the air storage process is as follows: air enters from the air compression assembly through the air inlet... Upon entry, the air compression assembly compresses the air, generating heat of compression, which then enters the steam generator 5. The compressed air then exchanges heat with water in the steam generator 5. After heat exchange, the generated steam enters the user end for use. Simultaneously, the compressed air, after heat exchange, enters the compressed air storage tank 6 for storage. The compressed air usage process is as follows: compressed air is released from the compressed air storage tank 6, then first enters the first steam heater 7, where it is heated by steam from the steam network 1. It then enters the power generation assembly, serving as a driving source for power generation. The electricity generated by the power generation assembly enters the power grid 2.

[0036] The air energy storage system is used as an independent system, providing comprehensive energy supply to meet more needs. In the above technical solution, a steam generator 5 is installed to exchange the heat generated by the air compression assembly with water within the steam generator 5, producing steam for user use. The user is considered the end point for absorbing the compressor's heat, thus coupling the air energy storage system with the user side to provide steam for the user's needs. This also eliminates the need for separate heat storage equipment for compressed air energy storage. Furthermore, existing technologies for storing compressed air heat typically include heat transfer oil, molten salt systems, high-pressure water storage systems, etc., which is significantly more efficient than installing separate systems. Steam generator 5 is more expensive overall, so the above technical solution also reduces costs to some extent. Moreover, a first steam heater 7 is installed after the compressed air storage tank 6. The first steam heater 7 heats the compressed air with steam, so that the compressed air is heated before entering the power generation component, increasing its own temperature and ensuring the power generation efficiency of the power generation component. At the same time, the first steam heater 7 uses the steam from the steam network 1 as a heat exchange source. The steam after heat exchange will also enter the user end, utilizing the part of energy that would have been wasted by the desuperheating and pressure reducing valve when the steam network 1 directly enters the user end to heat the compressed air, realizing energy utilization and avoiding energy waste.

[0037] Specifically, the user end includes industrial users 12, refrigeration units 15, and residential users 16. Because the steam from the air energy storage system is of high quality, it will first enter industrial users 12 for use. Moreover, industrial users 12 and residential users 16 are connected by a first water supply pipe 13, and industrial users 12 are connected by a second water supply pipe 14. After industrial users 12 finish using the water, some of the hot water will be directly supplied to residential users 16 through the first water supply pipe 13, and the other part of the hot water will be supplied to refrigeration units 15 through the second water supply pipe 14. Refrigeration units 15 will generate cold air and supply it to residential users 16, thus meeting the various needs of users.

[0038] Specifically, the air compression assembly includes a first air compressor 3 and a second air compressor 4. The steam generator 5 has a first air inlet, a second air inlet, a first air outlet, and a second air outlet. The first air inlet and the first air outlet are connected, as are the second air inlet and the second air outlet. The air outlet of the first air compressor 3 is connected to the first air inlet, the first air outlet is connected to the air inlet of the second air compressor 4, the air outlet of the second air compressor 4 is connected to the second air inlet, and the second air outlet is connected to the air inlet of the compressed air storage tank 6. The steam outlet of the steam generator 5 is connected to the industrial user 12, meaning the air will first enter the storage tank. The compressed air enters the first air compressor 3, generating heat of compression. It then enters the steam generator 5 to exchange heat with water. After heat exchange, the compressed air enters the second air compressor 4 for further compression, generating heat of compression again. The compressed air with heat of compression then enters the steam generator 5 again through the second air inlet, where it exchanges heat with water once more. After heat exchange, the steam is supplied to industrial users 12, while the compressed air is stored in the compressed air storage tank 6. Through two-stage heat exchange, the heat exchange efficiency is improved, and the waste of heat of compression is avoided. Compared with single-stage compression, the compression efficiency is improved through two-stage compression.

[0039] More specifically, the first air compressor 3 has a first inlet and a second inlet. The first inlet is connected to an air duct that allows air to flow at a normal speed, and the second inlet is connected to the steam network 1. Thus, air and steam at normal speed enter the first air compressor 3 simultaneously, creating a pressure difference that drives the first air compressor 3. The first air compressor 3 does not use electrical energy from the power grid 2, saving some energy. Furthermore, the steam outlet of the first air compressor 3 is connected to the user end, specifically to industrial user 12. The steam that drives the first air compressor 3 is supplied to industrial user 12 after use, preventing energy waste. Moreover, the energy that would have been wasted by the desuperheating and pressure reducing valve before the steam network 1 directly enters industrial user 12 is reused as the driving energy for the first air compressor 3, achieving energy utilization. In short, it saves electrical energy, further utilizes previously wasted energy, improves energy efficiency, and further reduces operating costs. To ensure the compression efficiency of the second air compressor 4, the second air compressor 4 uses electricity from the power grid 2.

[0040] Specifically, the power generation components include a first turbine 8, a second turbine 10, and a generator 11 connected to the power grid 2. The first turbine 8, the second turbine 10, and the generator 11 are coaxially arranged, and the electrical energy generated by the generator 11 enters the power grid 2. Furthermore, a second steam heater 9 is connected between the first turbine 8 and the second turbine 10 to heat the compressed air, further improving the power generation efficiency of the generator 11. The steam inlet of the second steam heater 9 is connected to the steam network 1, and the steam outlet is connected to the user end. Specifically, because the steam from the second steam heater 9 is of high quality, it will directly enter the industrial user 12, avoiding the waste of steam energy. Moreover, it can utilize the energy that would have been wasted by the steam network 1 directly entering the user end through the desuperheating and pressure reducing valve to heat the compressed air, achieving energy reuse. Furthermore, the exhaust temperature of the second turbine 10 is about 40°C, which can be fully utilized to supply the user with heating or for other purposes.

[0041] During the entire system operation, the steam from the first air compressor 3, the steam generated by the steam generator 5, the steam after heat exchange by the first steam heater 7, and the steam after heat exchange by the second steam heater 9 are all supplied to the industrial user 12, and the quality of each is different. Thus, the air energy storage system can generate steam of various qualities for the industrial user 12 to use. In addition, the compressed air storage tank 6 is also connected to the industrial user 12 to provide compressed air to the industrial user 12, making it more convenient for the industrial user 12 to use.

[0042] Furthermore, the system also includes a preheater 17, whose outlet is connected to the inlet of the air compression assembly. Specifically, it is connected to the inlet of the first air compressor 3, i.e., connected to the air pipeline. The preheater 17 is externally connected to the air supply pipeline. The hot water outlet pipeline at the user end is connected to the inlet of the preheater 17. That is, the hot water used by the residential user 16 enters the preheater 17 through the hot water outlet pipeline to exchange heat with the air in the preheater 17, preheating the air before compression and improving the air compression efficiency.

[0043] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A comprehensive energy supply system that couples compressed air energy storage to the user side, characterized in that, This includes steam networks, air energy storage systems, and user terminals; The air energy storage system includes an air compression assembly, a steam generator, a compressed air storage tank, a first steam heater, and a power generation assembly connected to the power grid in sequence. The steam generator has a water inlet pipe connected to its water inlet and a steam outlet connected to the user end. The steam inlet of the first steam heater is connected to the steam network, and the steam outlet is connected to the user terminal; When storing air, the air is compressed by the air compression assembly and stored in the compressed air storage tank via the steam generator; when using compressed air, the compressed air enters the first steam heater and is heated by steam from the steam network, and the heated compressed air enters the power generation assembly to generate electricity. The air compression assembly includes a first air compressor, the outlet of which is connected to the inlet of the steam generator. The first air compressor has a first inlet and a second inlet. The first inlet is connected to an air duct, and the second inlet is connected to the steam network. The steam outlet of the first air compressor is connected to the user terminal.

2. The integrated energy supply system for compressed air energy storage coupled to the user side according to claim 1, characterized in that, The air compression assembly also includes a second air compressor connected to the power grid, and the steam generator has a first air inlet, a second air inlet, a first air outlet, and a second air outlet; The air outlet of the first air compressor is connected to the first air inlet, and the first air outlet is connected to the air inlet of the second air compressor. The outlet of the second air compressor is connected to the second air inlet, and the second air outlet is connected to the air inlet of the compressed air storage tank.

3. The integrated energy supply system for compressed air energy storage coupled to the user side according to claim 1, characterized in that, The power generation assembly includes a first turbine, a second turbine, and a generator connected to the power grid, wherein the first turbine, the second turbine, and the generator are coaxially arranged. A second steam heater is connected between the first turbine and the second turbine for heating compressed air.

4. The integrated energy supply system for compressed air energy storage coupled to the user side according to claim 3, characterized in that, The steam inlet of the second steam heater is connected to the steam network, and the steam outlet is connected to the user terminal.

5. The integrated energy supply system for compressed air energy storage coupled to the user side according to claim 1, characterized in that, It also includes a preheater, the outlet of which is connected to the inlet of the air compression assembly; The hot water outlet pipe at the user end is connected to the water inlet of the preheater for preheating air.

6. The integrated energy supply system for compressed air energy storage coupled to the user side according to claim 1, characterized in that, The user terminal includes industrial users and residential users, and a first water supply pipeline is connected between the industrial users and the residential users to provide hot water to the residential users; The steam generator's outlet is connected to the industrial user, the first steam heater's outlet is connected to the industrial user, and the air compression assembly's outlet is connected to the industrial user. The outlet of the compressed air storage tank is connected to the industrial user for supplying compressed air to the industrial user; The air outlet of the power generation component is connected to the residential user to provide the residential user with air at a certain temperature.

7. The integrated energy supply system for compressed air energy storage coupled to the user side according to claim 6, characterized in that, The user terminal also includes a refrigeration unit. A second water supply pipeline is connected between the industrial user and the refrigeration unit to provide a heat source to the refrigeration unit. A gas supply pipeline is connected between the refrigeration unit and the residential user to provide cool air to the residential user.

Images